SERVICE MANUAL 750/600 - Diagramas dediagramas.diagramasde.com/otros/bIZHUB 600.pdf · SERVICE MANUAL 2005.08 Ver. 1.0 750/600 Theory of Operation Main body

SERVICE MANUAL

2005.08

750/600

Theory of Operation

Main body

Ver. 1.0

SAFETY AND IMPORTANT WARNING ITEMS

Read carefully the Safety and Important Warning Items described below to understand them before doing service work.

Because of possible hazards to an inexperienced person servicing this product as well as the risk of damage to the product, Konica Minolta Business Technologies, INC. (hereafter called the KMBT) strongly recommends that all servicing be performed only by KMBT-trained service technicians.Changes may have been made to this product to improve its performance after this Service Manual was printed. Accordingly, KMBT does not warrant, either explicitly or implicitly, that the information contained in this Service Manual is complete and accurate.The user of this Service Manual must assume all risks of personal injury and/or damage to the product while servicing the product for which this Service Manual is intended.Therefore, this Service Manual must be carefully read before doing service work both in the course of technical training and even after that, for performing maintenance and control of the product properly.Keep this Service Manual also for future service.

In this Service Manual, each of three expressions " DANGER", " WARNING", and " CAUTION" is defined as follows together with a symbol mark to be used in a limited meaning.When servicing the product, the relevant works (disassembling, reassembling, adjustment, repair, maintenance, etc.) need to be conducted with utmost care.

Symbols used for safety and important warning items are defined as follows:


IMPORTANT NOTICE

DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION

DANGER: Action having a high possibility of suffering death or serious injury

WARNING: Action having a possibility of suffering death or serious injury

CAUTION: Action having a possibility of suffering a slight wound, medium trouble and property damage

:Precaution when using the copier. General

precautionElectric hazard High

temperature

:Prohibition when using the copier. General

prohibitionDo not touch with wet hand

Do not disassemble

:Direction when using the copier. General

instructionUnplug Ground/Earth

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[1] MODIFICATIONS NOT AUTHORIZED BY KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.

Konica Minolta brand products are renowned for their high reliability. This reliability is achieved through high-quality design and a solid service network.Product design is a highly complicated and delicate process where numerous mechanical, physical, and electrical aspects have to be taken into consideration, with the aim of arriving at proper tolerances and safety factors. For this reason, unauthorized modifications involve a high risk of degradation in performance and safety. Such modifications are therefore strictly prohibited. The points listed below are not exhaustive, but they illustrate the reason-ing behind this policy.

SAFETY WARNINGS

Prohibited Actions

DANGER• Using any cables or power cord not specified by KMBT.

• Using any fuse or thermostat not specified by KMBT.

Safety will not be assured, leading to a risk of fire and

injury.

• Disabling fuse functions or bridging fuse terminals with

wire, metal clips, solder or similar object.

• Disabling relay functions (such as wedging paper between

relay contacts)

• Disabling safety functions (interlocks, safety circuits, etc.)

Safety will not be assured, leading to a risk of fire and

injury.

• Making any modification to the product unless instructed

by KMBT

• Using parts not specified by KMBT

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[2] POWER PLUG SELECTION

In some countries or areas, the power plug provided with the product may not fit wall outlet used in the area. In that case, it is obligation of customer engineer (hereafter called the CE) to attach appropriate power plug or power cord set in order to connect the product to the supply.

Power Cord Set or Power Plug

WARNING• Use power supply cord set which meets the following

criteria:

- provided with a plug having configuration intended for the connection to wall outlet appropriate for the prod-uct's rated voltage and current, and

- the plug has pin/terminal(s) for grounding, and

- provided with three-conductor cable having enough cur-rent capacity, and

- the cord set meets regulatory requirements for the area.

Use of inadequate cord set leads to fire or electric shock.

• Attach power plug which meets the following criteria:

- having configuration intended for the connection to wall outlet appropriate for the product's rated voltage and current, and

- the plug has pin/terminal(s) for grounding, and

- meets regulatory requirements for the area.

Use of inadequate cord set leads to the product connect-ing to inadequate power supply (voltage, current capacity, grounding), and may result in fire or electric shock.

• Conductors in the power cable must be connected to ter-

minals of the plug according to the following order:

• Black or Brown: L (line)

• White or Light Blue: N (neutral)

• Green/Yellow: PE (earth)

Wrong connection may cancel safeguards within the product, and results in fire or electric shock.

AC230V

AC208V 240V

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[3] CHECKPOINTS WHEN PERFORMING ON-SITE SERVICE

Konica Minolta brand products are extensively tested before shipping, to ensure that all applicable safety standards are met, in order to protect the customer and CE from the risk of injury. However, in daily use, any electrical equipment may be subject to parts wear and eventual failure. In order to maintain safety and reliability, the CE must perform regular safety checks.

1. Power Supply

Connection to Power Supply

WARNING• Check that mains voltage is as specified.

Connection to wrong voltage supply may result in fire or electric shock.

• Connect power plug directly into wall outlet having same

configuration as the plug.

Use of an adapter leads to the product connecting to inadequate power supply (voltage, current capacity, grounding), and may result in fire or electric shock.

If proper wall outlet is not available, advice the customer to contact qualified electrician for the installation.

• Plug the power cord into the dedicated wall outlet with a

capacity greater than the maximum power consumption.

If excessive current flows in the wall outlet, fire may result.

• If two or more power cords can be plugged into the wall

outlet, the total load must not exceed the rating of the wall

outlet.

If excessive current flows in the wall outlet, fire may result.

• Make sure the power cord is plugged in the wall outlet

securely.

Contact problems may lead to increased resistance, overheating, and the risk of fire.

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• Check whether the product is grounded properly.

If current leakage occurs in an ungrounded product, you may suffer electric shock while operating the product.

Connect power plug to grounded wall outlet.

Connection to Power Supply

WARNING

Power Plug and Cord

WARNING• When using the power cord set (inlet type) that came with

this product, make sure the connector is securely inserted

in the inlet of the product.

When securing measure is provided, secure the cord with

the fixture properly.

If the power cord (inlet type) is not connected to the prod-uct securely, a contact problem may lead to increased resistance, overheating, and risk of fire.

• Check whether the power cord is not stepped on or

pinched by a table and so on.

Overheating may occur there, leading to a risk of fire.

• Check whether the power cord is damaged. Check

whether the sheath is damaged.

If the power plug, cord, or sheath is damaged, replace with a new power cord or cord set (with plug and connec-tor on each end) specified by KMBT.

Using the damaged power cord may result in fire or elec-tric shock.

• Do not bundle or tie the power cord.

Overheating may occur there, leading to a risk of fire.

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• Check whether dust is collected around the power plug

and wall outlet.

Using the power plug and wall outlet without removing dust may result in fire.

• Do not insert the power plug into the wall outlet with a wet

hand.

The risk of electric shock exists.

• When unplugging the power cord, grasp the plug, not the

cable.

The cable may be broken, leading to a risk of fire and electric shock.

Power Plug and Cord

WARNING

Wiring

WARNING• Never use multi-plug adapters to plug multiple power cords

in the same outlet.

If used, the risk of fire exists.

• When an extension cord is required, use a specified one.

Current that can flow in the extension cord is limited, so

using a too long extension cord may result in fire.

Do not use an extension cable reel with the cable taken up. Fire may result.

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2. Installation Requirements

Prohibited Installation Places

WARNING• Do not place the product near flammable materials or vola-

tile materials that may catch fire.

A risk of fire exists.

• Do not place the product in a place exposed to water such

as rain.

A risk of fire and electric shock exists.

When not Using the Product for a long time

WARNING• When the product is not used over an extended period of

time (holidays, etc.), switch it off and unplug the power

cord.

Dust collected around the power plug and outlet may

cause fire.

Ventilation

CAUTION• The product generates ozone gas during operation, but it

will not be harmful to the human body.

If a bad smell of ozone is present in the following cases, ventilate the room.

a. When the product is used in a poorly ventilated roomb. When taking a lot of copiesc. When using multiple products at the same time

Fixing

CAUTION• Be sure to lock the caster stoppers.

In the case of an earthquake and so on, the product may slide, leading to a injury.

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Inspection before Servicing

CAUTION• Before conducting an inspection, read all relevant docu-

mentation (service manual, technical notices, etc.) and

proceed with the inspection following the prescribed pro-

cedure in safety clothes, using only the prescribed tools.

Do not make any adjustment not described in the docu-

mentation.

If the prescribed procedure or tool is not used, the prod-uct may break and a risk of injury or fire exists.

• Before conducting an inspection, be sure to disconnect

the power plugs from the product and options.

When the power plug is inserted in the wall outlet, some units are still powered even if the POWER switch is turned OFF. A risk of electric shock exists.

• The area around the fixing unit is hot.

You may get burnt.

Work Performed with the Product Powered On

WARNING• Take every care when making adjustments or performing

an operation check with the product powered.

If you make adjustments or perform an operation check with the external cover detached, you may touch live or high-voltage parts or you may be caught in moving gears or the timing belt, leading to a risk of injury.

• Take every care when servicing with the external cover

detached.

High-voltage exists around the drum unit. A risk of elec-tric shock exists.

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Safety Checkpoints

WARNING• Check the exterior and frame for edges, burrs, and other

damages.

The user or CE may be injured.

• Do not allow any metal parts such as clips, staples, and

screws to fall into the product.

They can short internal circuits and cause electric shock or fire.

• Check wiring for squeezing and any other damage.

Current can leak, leading to a risk of electric shock or fire.

• Carefully remove all toner remnants and dust from electri-

cal parts and electrode units such as a charging corona

unit.

Current can leak, leading to a risk of product trouble or fire.

• Check high-voltage cables and sheaths for any damage.


• Check electrode units such as a charging corona unit for

deterioration and sign of leakage.

Current can leak, leading to a risk of trouble or fire.

• Before disassembling or adjusting the write unit (P/H unit)

incorporating a laser, make sure that the power cord has

been disconnected.

The laser light can enter your eye, leading to a risk of loss of eyesight.

• Do not remove the cover of the write unit. Do not supply

power with the write unit shifted from the specified mount-

ing position.

The laser light can enter your eye, leading to a risk of loss of eyesight.

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• When replacing a lithium battery, replace it with a new lith-

ium battery specified in the Parts Guide Manual. Dispose

of the used lithium battery using the method specified by

local authority.

Improper replacement can cause explosion.

• After replacing a part to which AC voltage is applied (e.g.,

optical lamp and fixing lamp), be sure to check the installa-

tion state.


• Check the interlock switch and actuator for loosening and

check whether the interlock functions properly.

If the interlock does not function, you may receive an electric shock or be injured when you insert your hand in the product (e.g., for clearing paper jam).

• Make sure the wiring cannot come into contact with sharp

edges, burrs, or other pointed parts.


• Make sure that all screws, components, wiring, connec-

tors, etc. that were removed for safety check and mainte-

nance have been reinstalled in the original location. (Pay

special attention to forgotten connectors, pinched cables,

forgotten screws, etc.)

A risk of product trouble, electric shock, and fire exists.

Safety Checkpoints

WARNING

Handling of Consumables

WARNING• Toner and developer are not harmful substances, but care

must be taken not to breathe excessive amounts or let the

substances come into contact with eyes, etc. It may be

stimulative.

If the substances get in the eye, rinse with plenty of water immediately. When symptoms are noticeable, consult a physician.

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• Never throw the used cartridge and toner into fire.

You may be burned due to dust explosion.

Handling of Consumables

WARNING

Handling of Service Materials

CAUTION• Unplug the power cord from the wall outlet.

Drum cleaner (isopropyl alcohol) and roller cleaner (ace-tone-based) are highly flammable and must be handled with care. A risk of fire exists.

• Do not replace the cover or turn the product ON before

any solvent remnants on the cleaned parts have fully

evaporated.


• Use only a small amount of cleaner at a time and take

care not to spill any liquid. If this happens, immediately

wipe it off.


• When using any solvent, ventilate the room well.

Breathing large quantities of organic solvents can lead to discomfort.

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SAFETY INFORMATION

The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Admin-istration implemented regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products marketed in the United States.

This copier is certified as a "Class 1" laser product under the U.S.Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. Since radiation emit-ted inside this copier is completely confined within protective housings and external covers, the laser beam cannot escape during any phase of normal user operation.

SAFETY INFORMATIONIMPORTANT NOTICE

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SAFETY INFORMATION

Caution labels shown below are attached in some areas on/in the machine.When accessing these areas for maintenance, repair, or adjustment, special care should be taken to avoid burns and electric shock.

For metric area:

INDICATION OF WARNING ON THE MACHINE

57aap0e001na

DO NOT put your hand

between the main body and

developing fixing unit;

otherwise you may be

injured.

High voltage is present

around this part.

Do not touch this part

in order to reduce the risk

of electric shock.

DO NOT INSERT

your finger into

the two EDH

hinge portions;

otherwise you

may be injured.

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SAFETY INFORMATION

For inch area:

CAUTION:

57aap0e002na

DO NOT put your hand

between the main body and

developing fixing unit;

otherwise you may be

injured.

High voltage is present

around this part.

Do not touch this part

in order to reduce the risk

of electric shock.

DO NOT INSERT

your finger into

the two EDH

hinge portions;

otherwise you

may be injured.

• You may be burned or injured if you touch any area that you are advised by any caution label to keep yourself away from. Do not remove caution labels. And also, when the caution label is peeled off or soiled and cannot be seen clearly, replace it with a new caution label.

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MEASURES TO TAKE IN CASE OF AN ACCIDENT

1. If an accident has occurred, the distributor who has been notified first must immediately take emergency measures to provide relief to affected persons and to prevent further damage.

2. If a report of a serious accident has been received from a customer, an on-site evalua-tion must be carried out quickly and KMBT must be notified.

3. To determine the cause of the accident, conditions and materials must be recorded through direct on-site checks, in accordance with instructions issued by KMBT.

4. For reports and measures concerning serious accidents, follow the regulations given in "Serious Accident Report/Follow-up Procedures."


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Blank page

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Composition of the service manualThis service manual consists of the following sections and chapters:

<Theory of Operation section>

This section gives, as information for the CE to get a full understanding of the product, a

rough outline of the object and role of each function, the relationship between the electrical

system and the mechanical system, and the timing of operation of each part.

<Field service section>

This section gives, as information required by the CE at the site (or at the customer's

premise), a rough outline of the service schedule and its details, maintenance steps, the

object and role of each adjustment, error codes and supplementary information.

The details of items with an asterisk "*" are described only in the service manual ofthe main body.

OUTLINE: System configuration, product specifications,

unit configuration, and paper path

COMPOSITION/OPERATION: Configuration of each unit, explanation of the operating

system, and explanation of the control system

OUTLINE: System configuration, and product specifications

MAINTENANCE: Service schedule *, maintenance steps,

list of service tools and directions for use *,

firmware version up method *,

and removal/reinstallation methods of major parts

ADJUSTMENT/SETTING: Utility mode *, service mode *, security and mechanical

adjustment

TROUBLESHOOTING*: List of jam codes, their causes, operation when a jam

occurs and its release method, and list of error codes,

their causes, operation when a warning is issued and esti-

mated abnormal parts.

APPENDIX*: Parts layout drawings, connector layout drawings, timing

chart, overall layout drawing

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Notation of the service manualA. Product nameIn this manual, each of the products is described as follows:

B. Brand nameThe company names and product names mentioned in this manual are the brand name or

the registered trademark of each company.

C. Electrical parts and signalsThose listed by way of example below are not exhaustive, but only some instances among

many.

(1) IC board: Standard printer

(2) bizhub 750/600: Main body

(3) PS-502 PostScript3 Option: PS3 Option

(4) Microsoft Windows 95: Windows 95

Microsoft Windows 98: Windows 98

Microsoft Windows Me: Windows Me

Microsoft Windows NT 4.0: Windows NT 4.0 or Windows NT

Microsoft Windows 2000: Windows 2000

Microsoft Windows XP: Windows XP

When the description is made in combination of the OS's mentioned above:

Windows 95/98/Me

Windows NT 4.0/2000

Windows NT/2000/XP

Windows 95/98/Me/NT/2000/XP

Classification Load symbol Ex. of signal name Description

Sensor PS

IN

Sensor detection signal

PS

Door PS1

SIG

102 PS

Solenoid SD

24V Power to drive the solenoid

DRVDrive signal

SOL

Clutch CL

24V Power to drive the clutch

DRVDrive signal

SOL

C-2

Motor M

24V Power to drive the motor

CONT Drive signal

DRV1

Drive signals of two kindsDRV2

D1

D2

Motor M

_U

Drive signals (control signals) of three kinds

_V

_W

DRV1

DRV2

DRV3

D1

Drive signals (control signals) of four kindsMotor, phases A and B control signals

D2

D3

D4

DRV A

DRV A

DRV B

DRV B

A

/A

B

/B

AB

BB

CLK, PLL PLL control signal

LCK, Lock, LD PLL lock signal

FR Forward/reverse rotation signal

EM, Lock, LCK, LD Motor lock abnormality

BLK Drive brake signal

P/S Power/stop

S/SOperating load start/stop signal

SS

CW/CCW, F/R Rotational direction switching signal

ENB Effective signal

TEMP_ER Motor temperature abnormality detection signal

Fan FM

24V Power to drive the fan motor

CONT, DRIVE Drive signal

HL Speed control signal (2 speeds)

EM, Lock, LCK, FEM Detection signal

Others TH1.S, ANG Analog signal


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GroundSG, S.GND, S_GND Signal ground

PG, P.GND Power ground

Serial com-munication

DCD Data carrier detection

SIN Serial input

SOUT Serial output

DTR Data terminal operation available

GND Signal ground (earth)

DSR, DSET Data set ready

RTS Transmission request signal

CTS Consent transmission signal

RI Ring indicator

TXD Serial transmission data

RXD Serial reception data


C-4

Revision historyAfter publication of this service manual, the parts and mechanism may be subject to change forimprovement of their performance. Therefore, the descriptions given in this service manual may not coincide with the actual machine.

When any change has been made to the descriptions in the service manual, a revised version will beissued with a revision mark added as required.

Revision mark:• To indicate clearly a section revised, show to the left of the revised section.

A number within represents the number of times the revision has been made.

• To indicate clearly a section revised, show in the lower outside section of the correspond-ing page. A number within represents the number of times the revision has been made.

NOTERevision marks shown in a page are restricted only to the latest ones with the old ones deleted.

• When a page revised in Ver. 2.0 has been changed in Ver. 3.0: The revision marks for Ver. 3.0 only are shown with those for Ver. 2.0 deleted.

• When a page revised in Ver. 2.0 has not been changed in Ver. 3.0: The revision marks for Ver. 2.0 are left as they are.

11

1

1

2005/08 1.0 — Issue of the first edition

Date Service manual Ver. Revision mark Descriptions of revision

biz

hu

b 7

50

/60

0

Theory of Operation Ver1.0 Aug.2005

CONTENTS

bizhub 750/600

OUTLINE

1. SYSTEM CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12. PRODUCT SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33. UNIT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64. PAPER PATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

COMPOSITION/OPERATION

5. OVERALL CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1 Time chart when the power is turned ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.2 Control block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6. SCANNER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.3.1 Scan/exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.3.2 Original size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186.3.3 AE control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196.3.4 Image processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7. WRITE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2.1 Laser beam path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.2.2 Write control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.2.3 Polygon control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.2.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

8. PHOTO CONDUCTOR SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

8.2.1 Drum drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.2.2 Drum claw drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

8.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248.3.1 Image creation control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248.3.2 Drum claw control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258.3.3 Cooling around the drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258.3.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9. CHARGING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.3.1 Charging control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289.3.2 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289.3.3 Erase lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

10.TRANSFER/SEPARATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2910.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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10.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2910.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.3.1 Transfer guide control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.3.2 Transfer/separation control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3010.3.3 Transfer exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3010.3.4 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

11.DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3211.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3211.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3211.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

11.3.1 Conveyance of developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3311.3.2 Developing bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3311.3.3 Developing suction control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3411.3.4 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

12.TONER SUPPLY SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3512.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3512.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3512.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

12.3.1 Toner remaining detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3612.3.2 Toner supply control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3612.3.3 Toner conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

13.CLEANING/TONER RECYCLE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3813.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3813.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3813.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

13.3.1 Toner guide roller control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3913.3.2 Other controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3913.3.3 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

14.PAPER FEED SECTION (trays 1 and 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4014.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4014.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

14.2.1 Paper feed drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4114.2.2 Tray lift drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

14.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4314.3.1 Up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4314.3.2 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4414.3.3 Paper empty detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4714.3.4 Remaining paper detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4714.3.5 Horizontal conveyance control (tray 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

15.PAPER FEED SECTION (trays 3 and 4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4915.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4915.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

15.2.1 Paper feed drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5015.2.2 Tray lift drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

15.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5215.3.1 Up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5215.3.2 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5215.3.3 Paper size detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5315.3.4 Paper empty detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5315.3.5 Remaining paper detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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15.3.6 Dehumidification heater control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5316.BYPASS TRAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

16.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

16.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5516.2.1 Paper feed drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5516.2.2 Tray lift drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

16.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5616.3.1 Up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5616.3.2 Paper size detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5616.3.3 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5716.3.4 Paper empty detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5816.3.5 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

17.VERTICAL CONVEYANCE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5917.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5917.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6017.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

17.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6118.REGISTRATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

18.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6418.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

18.2.1 Registration drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6518.2.2 Loop roller drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

18.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6618.3.1 Loop control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6618.3.2 Paper mis-centering correction control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

19.HORIZONTAL CONVEYANCE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6919.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6919.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6919.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

19.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7019.3.2 Thick paper support mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

20.ADU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7320.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7320.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

20.2.1 ADU conveyance roller drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7420.2.2 ADU reverse roller drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7420.2.3 ADU pre-registration roller drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7520.2.4 Reverse/exit roller drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

20.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7620.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

21.FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7821.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7821.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

21.2.1 Fusing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7921.2.2 Cleaning web drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7921.2.3 Reverse/exit switching gate drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

21.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8121.3.1 Web solenoid control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8121.3.2 Fusing temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8221.3.3 Protection against abnormality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

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21.3.4 Fusing conveyance mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8422.REVERSE/EXIT SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

22.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

22.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8522.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

22.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8623. INTERFACE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

23.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8823.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

23.2.1 Interface specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8824. IMAGE STABILIZATION CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

24.1 Outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8924.2 Operation flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

24.2.1 Image stabilization control flow when the power switch (SW2) is ON . . . . . . . . . . . . . . . . . . . . 8924.2.2 Image stabilization control flow while in the print and after completion of the print. . . . . . . . . . . 91

25. IMAGE PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9425.1 Image processing in the scanner section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

25.1.1 Shading correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9425.1.2 AE processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9525.1.3 Area discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.4 Brightness/density conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.5 Filter/magnification and contraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.6 Density gamma (conversion). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.7 Tilt adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.8 Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9625.1.9 Storage of image data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

25.2 Image processing in the write section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9725.2.1 Elongation/rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9725.2.2 1dotPWM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9725.2.3 Frequency conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

26.OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9826.1 Fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

26.1.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9826.1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

26.2 Counter control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10326.2.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10326.2.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

26.3 Parts that operate when the power switch is turned ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10526.3.1 Parts that operate when the power cord is plugged into the power outlet. . . . . . . . . . . . . . . . 10526.3.2 Parts that operate when the main power switch (SW1) is turned ON . . . . . . . . . . . . . . . . . . . 10626.3.3 Parts that operate when the power switch (SW2) is turned ON. . . . . . . . . . . . . . . . . . . . . . . . 107

CONTENTS

1. SYSTEM CONFTheory of Operation Ver1.0 Aug.2005

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OUTLINE

1. SYSTEM CONFIGURATION

A. System configuration

[1] Main body [9] 50 sheet staple flat stapling finisher (FS-504)

[2] Double sided original auto feeder (DF-604) [10] Stitch-and-fold finisher (FS-602)

[3] Volume paper feed tray (LU-401) [11] Key counter

[4] Volume paper feed tray (LU-402) [12] Local connection kit (EK-701)

[5] Paper exit tray with offset function (SF-601) [13] Image controller (IC-202)

[6] Z-folding puncher (ZU-601/ZU-602) [14] Extended memory: 256 MB (EM-701)

[7] Torque limiter separation type sheet feeder (PI-501)

[15] Paper exit tray

[16] Hard disk (HD-503)

[8] FS self-contained puncher (PK-502/PK-503/PK-504/PK-505)

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[4]

[3]

[12]

[13]

[11]

[7]

[8]

[7]

[8]

[10]

[9]

[6]

[5]

[16]

[14]

[15] [1]

[2]

IGURATION

1

ONFIGURATION

2

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B. Configuration for optional device connection

NOTE

• For machines equipped with ZU-601/602, the function of PK-502/503/504/505 is not available

when PI-501 is not equipped.

• Any combination other than those listed below is not available.

*1 Paper fed from PI-501 cannot be punched.*2 Paper fed from PI-501 is punched by PK-502/503/504/505. And paper fed from those other than PI-501

is punched by ZU-601/602.

No. Combinations of finishing AC power to be connected to

1 FS-504/FS-602

2 SF-601

3 FS-504/FS-602 PI-501

4 FS-504/FS-602 PK-502/PK-503/PK-504/PK-505

5 FS-504/FS-602 PI-501 PK-502/PK-503/PK-504/PK-505

6 ZU-601/ZU-602 FS-504/FS-602 External (ZU-601/ZU-602)

7 ZU-601/ZU-602 FS-504/FS-602 PI-501 *1 External (ZU-601/ZU-602)

8 ZU-601 *2 FS-504/FS-602 PI-501 PK-504 *2 External (ZU-601)

9 ZU-602 *2 FS-504/FS-602 PI-501 PK-502/PK-503/PK-505 *2

External (ZU-602)

1. SYSTEM C

2. PRODUCT SPECTheory of Operation Ver1.0 Aug.2005

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2. PRODUCT SPECIFICATIONS

A. Type

B. Functions

Type Console type (floor-mount type)

Copying method Indirect electrostatic method

Original stand Fixed

Original alignment Left rear standard

Photosensitive material OPC

Sensitizing method Laser writing

Paper feed trays Four trays (1,500 sheets x1, 1,000 sheets x 1, 500 sheets x 2: 80 g/m2)Bypass feed (100 sheet x 1: 80 g/m2)LU-401 (5,000 sheet x 1: 64 g/m2) *1LU-402 (4,500 sheet x 1: 64 g/m2) *1

*1 LU-401 and LU-402 are optional.

Original Sheet, book, solid object

Max. original size A3 or 11 x 17

Copy size Trays 1 and 2 Inch: 8.5 x 11, 5.5 x 8.5, A4, B5, A5Metric: A4, B5, A5, 8.5 x 11, 5.5 x 8.5, 16k

Trays 3 and 4 Inch: 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, A3 to A5, wide paper (up to 314 mm x 458 mm)

Metric: A3 wide to A5, 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, 16k, 8k, wide paper (up to 314 mm x 458 mm)

Bypass feed Inch: 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, A3 to B6, A6, wide paper (up to 314 mm x 458 mm)

Metric: A3 wide to B6, A6, 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, 16k, 8k, wide paper (up to 314 mm x 458 mm)

ADU Inch: 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13 8.5 x 13, A3 to B5, A5, wide paper (up to 314 mm x 458 mm)

Metric: A3 wide to B5, A5, 11 x 17 to 5.5 x 8.5, 8.5 x 14, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, wide paper (up to 314 mm x 458 mm)

IFICATIONS

3

SPECIFICATIONS

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Magnification Fixed magnification Inch: x 1.000, x 1.214, x 1.294, x 1.545, x 2.000, x 0.785, x 0.772, x 0.647, x 0.500

Metric: x 1.000, x 1.154, x 1.224, x 1.414, x 2.000, x 0.866, x 0.816, x 0.707, x 0.500

Special magnifica-tion setting

x 0.930 (can be changed between x 0.900 and x 0.999)

Optional magnifica-tion setting

3 types

Zoom magnification x 0.250 to x 4.000 (at the step of 0.1%)

Vertical magnification x 0.250 to x 4.000 (at the step of 0.1%)

Horizontal magnification x 0.250 to x 4.000 (at the step of 0.1%)

Warm-up time 750 Less than 300 sec. (at temperature of 20°C, at rated volt-age)

600 Less than 270 sec. (at temperature of 20°C, at rated volt-age)

First copy out time 750 Less than 3.0 sec.

600 Less than 3.5 sec.

Continuous copy speed 750 75 copies/min. (for A4/8.5 x 11)

600 60 copies/min. (for A4/8.5 x 11)

Continuous copy count Up to 9,999 sheets

Original density selection Auto density selection, manual (9 steps), optional density (9 steps)

Resolution Scan 600 dpi x 600 dpi

Write 1,200 dpi (equivalent) x 600 dpi

Memory Standard 256 MB

Maximum 512 MB

Interface section RJ45 Ethernet, Serial port (RS232-C), Serial port (USB TypeB)

2. PRODUCT

2. PRODUCT SPECTheory of Operation Ver1.0 Aug.2005

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C. Type of paper

D. Maintenance

E. Machine data

F. Operating environment

NOTE

• The information herein may be subject to change for improvement without notice.

Plain paper *2 High quality paper of 60 g/m2 to 90 g/m2

Special paper *3 Bypass feed only OHP film, label paper *4, blueprint master paper *4, TAB paper

All trays High quality paper of 50 g/m2 to 59 g/m2 (thin paper)

High quality paper of 91 g/m2 to 200 g/m2 (thick paper)

*2 Standard specified paperInch: Hammermill Tidal MP (75 g/m2), Whyerhaeuser Recycled Laser CopyMetric: Konica Minolta Profi (80 g/m2), Konica Minolta Original (80 g/m2), Classic White

*3 Special paper/recommended paperThick paper: Inch: HM-Cover65lb (176 g/m2), HM-Laser, Print (32lb)

Metric: RDEREY200 (200 g/m2), Xerox3R91798 (160 g/m2), Xerox-Exclusive (110 g/m2), Xerox-3R92990 (200 g/m2)

Thin paper: Inch: Domter16lb Metric: Clair Mail (60 g/m2)

Label paper: Inch: AVERY 5160, 5352, 944410Metric: AVERY DSP24

Blue print master: Inch: —Metric: Transparent paper

OHP: Inch: HP92296TMetric: Konica 40200

TAB paper: Inch: AVERY 7103Metric: RX 3R90947

*4 Label paper and blueprint master are loaded and fed one sheet at a time.

Maintenance Every 250,000 prints

Machine service life 750,000 prints or 5 years (whichever earlier)

Power source 100V AC ± 10%, 50 Hz/60 Hz in common

Power consumption: 1,500 W or less (full option)

Weight Approx. 222 kg

Dimensions Main body + DF-604 W 650 mm x D 791 mm x H 1,140 mm

Main body + DF-604 + FS-504 + LU-401

W 1,874 mm x D 791 mm x H 1,140 mm

Temperature 10°C to 30°C

Humidity 10% RH to 80% RH

IFICATIONS

5

FIGURATION

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3. UNIT CONFIGURATION

[1] Photo conductor section [10] Paper feed section (trays 3, 4)

[2] Toner supply section [11] Paper feed section (trays 1, 2)

[3] Developing unit [12] Paper reverse/exit section

[4] Registration section [13] Fusing section

[5] Bypass tray [14] Cleaning/toner recycle section

[6] Horizontal conveyance section [15] Charging section

[7] Vertical conveyance section [16] Scanner section

[8] Transfer/separation section [17] Writing section

[9] ADU

57aat1c002na[8][9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[1]

[2]

[3]

[4]

[6]

[7]

[5]

3. UNIT CON

4. PATheory of Operation Ver1.0 Aug.2005

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4. PAPER PATH

[1] Tray 1 paper feed [7] Straight paper exit

[2] Tray 2 paper feed [8] ADU paper feed

[3] Tray 4 paper feed [9] Registration conveyance

[4] Tray 3 paper feed [10] Bypass feed

[5] Reverse conveyance [11] LU paper feed

[6] Reverse paper exit

[3] [2] [1][4][5][6]

[8][7] [9] [10] [11]

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PER PATH

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TH

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Blank page

4. PAPER PA

5. OVERALL CONFTheory of Operation Ver1.0 Aug.2005

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COMPOSITION/OPERATION

5. OVERALL CONFIGURATION

5.1 Time chart when the power is turned ON

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[1] [2][3] [5][4] [6]

0 30 60 90 150 180120

Scanner motor (M1)

Exposure lamp (L1)

Fusing heater lamp /1, /2 (L2, L3)

Fusing heater lamp /3 (L4)

Maximum density correction

Gamma correction

Fusing motor (M4)

Drum motor (M2)

Developing motor (M3)

Polygon motor (M15)

Laser (LDB)

Charging cleaning motor (M14)

Transfer/separation cleaning motor (M10)

Transfer/separation cleaning home sensor (PS52)

Transfer/separation cleaning limit sensor (PS53)

Paper lift motor /1 (M16)

ItemTime (sec)

Forward

Reverse

Upper limit sensor /1 (PS2)







Forward

Reverse

Forward

Reverse

IGURATION

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CONFIGURATION

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NOTE

• Each operation varies with the software DIPSW setting in the service mode and the environmental

conditions.

• The power is turned ON with DF closed.

• The power is turned ON with the tray lift plate brought down.

[1] Power switch (SW2) ON [4] Home position search/shading correction

[2] Thermistors /1 (TH1) and /2 (TH2) get to the specified temperature

[5] Image stabilization control

[6] Warm-up completed

[3] OS start-up completed

5. OVERALL

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5. OVERALL CONFTheory of Operation Ver1.0 Aug.2005

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5.2 Control block diagram

[1] Image bus [5] Other buses

[2] Parallel bus [6] Individual signal line

[3] Clock synchronization serial bus [7] IDE

[4] UART bus

FS/SFLU

HVADUDB

DF

SDB

M

M

M

FM CL

CL

SD

SD

PS

APS

Write

Section

SCBIPB

OBLAN

I/F

PCI

I/F

RS232C

I/F

USB

I/F

HDDCCD

PRCB

57aat2c085na[1][2][3][4][5][7] [6]

IGURATION

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SECTION

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6. SCANNER SECTION

6.1 Composition

6.2 Drive

[1] Scanner wire /Fr [4] Scanner wire /Rr

[2] V-mirror unit [5] Exposure unit

[3] Scanner motor (M11)

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Shading correction plate Exposure unit Mirror unit CCD unit

[2] [1]

[3] [4] [5]

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6.3 Operation

6.3.1 Scan/exposure lamp control

A. Operation when the power is turned ON

The home position varies depending on whether DF is open or closed. When DF is open, the home position is atthe platen APS read position and when it is closed, the DF read position becomes the home position. When thepower is turned ON, a search is made with the APS read position as the home position regardless of whetherDF is open or not.While the power switch (SW2) is ON, the exposure unit conducts the home position search and the shading cor-rection.

(1) Home position search

The home position search varies depending on whether the scanner home sensor (PS61) [2] is turned ON orOFF.

• Home position search when the scanner home sensor (PS61) is turned OFF

• Home position search when the scanner home sensor (PS61) is turned ON

[1] Position at which the platen APS is read [2] Scanner home sensor (PS61)

[1] Position at which the platen APS is read [2] Scanner home sensor (PS61)

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[1][2]

[1][2]

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(2) Shading correction

After completion of the home position search [4], the exposure unit conducts shading corrections. For shadingcorrections, there are the following types of corrections: white correction 1 [5], white correction 2 [6], and black

correction [7]. For the shading correction at the time of the power ON, these corrections are carried out in aseries of operations. And after completion of the corrections, the exposure unit returns to the position at whichthe platen APS is read [1]. When DF is open, the exposure unit stands by at the APS read position. And when itis closed, however, the unit conducts the home position search to the position [3] at which DF is read.

[1] Position at which the platen APS is read [6] White correction 2

[2] Scanner home sensor (PS61) [7] Black correction

[3] Position at which DF is read [8] Home position search when DF is closed

[4] Completion of the home position search [9] Exposure lamp (L1) on

[5] White correction 1 [10] Movement of the exposure unit

[2] [1]

[7]

[8]

[6]

[5]

[4]

[10][9]

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[3]

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B. Operation when the start button is turned ON

The operation when the start button is turned ON varies depending on whether DF is open or closed. In eitheroperation, the shading correction is carried out first. However, unlike the operation when the power is turned

ON, the exposure unit proceeds to the original read operation with the exposure lamp (L1) left on, and therefore,the black correction is not conducted.

(1) When the platen is in use (when DF is open)

When the platen is in use and the start button is turned ON, the operation varies depending on whether AE isselected or not.

• While in the AE copyWhen the start button is turned ON [3] while in the AE copy, the exposure unit conducts the white correction 1[4] and the white correction 2 [5] before the AE scan [6] is made. And then the exposure scan [7] is carried out.After completion of the exposure scan, the home position search [8] is made.

[1] Position at which the platen APS is read [6] AE scan

[2] Scanner home sensor (PS61) [7] Exposure scan

[3] Start button ON [8] Home position search

[4] White correction 1 [9] Exposure lamp (L1) on


[2] [1]

[8]

[3]

[4]

[5]

[6][7]

[10][9]

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• While in the manual copyWhen the start button is turned ON [3] while in the manual copy, the exposure unit conducts the white correction1 [4] and the white correction 2 [5] before the exposure scan [6] is made. After completion of the exposure scan,

the home position search [7] is carried out.

[1] Position at which the platen APS is read [6] Exposure scan

[2] Scanner home sensor (PS61) [7] Home position search

[3] Start button ON [8] Exposure lamp (L1) on


[5] White correction 2

[2] [1]

[3]

[4]

[5][6]

[7]

[9][8]

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(2) When DF is in use (when DF is closed)

When the start button is turned ON [4], the exposure unit conducts the white correction 1 [5] and the white cor-rection 2 [6] before moving to the original read position [3]. The same operation is made when AE is selected.

The exposure unit stops at the original read position to read the original [7]. After completion of reading of theoriginal, the exposure unit conducts the home position search [8] to the position at which the platen APS is read[1]. And then, it also conducts the home position search [9] to the position at which DF is read [3].

[1] Position at which the platen APS is read [8] Home position search (position at which the platen APS is read)[2] Scanner home sensor (PS61)

[3] Position at which DF is read [9] Home position search (position at which DF is read)[4] Start button ON

[5] White correction 1 [10] Exposure lamp (L1) on


[7] Original is read

[2] [1][3]

[4]

[5]

[6]

[7][8][9]

[11][10]

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6.3.2 Original size detection control

A. Detection method

The detection method of the original size varies with the DF mode and the platen mode.

(1) DF mode

See DF-604.

(2) Platen mode

• In the main scan directionRead is made by the CCD sensor.

• In the sub scan directionDetection is made by the combination of the APS sensors /1 (PS63), /2 (PS64) and /3 (PS65) that turn ONand OFF.

B. Detection timing

The detection timing of the original size varies with the DF mode and the platen mode.

(1) DF mode

See the DF-604.

(2) Platen mode

When the APS timing sensor (PS51) turns on with the DF closed, the exposure lamp (L1) turns ON and the CCDsensor and the APS sensor /1 (PS63), /2 (PS64) and /3 (PS65) detect the original size.

Original size PS65ON/OFF

PS63ON/OFF

PS64ON/OFF

Minimum size OFF OFF OFF

B5R ON OFF OFF

B5 OFF OFF OFF

B4 ON ON ON

A4R ON ON OFF

A4 OFF OFF OFF

A3 ON ON ON

8.5 x 11R ON OFF OFF

8.5 x 11 OFF OFF OFF

8.5 x 14 ON ON ON

11 x 17 ON ON ON

6. SCANNER

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6.3.3 AE control

When AE is selected, the density level of the original is detected to adjust it automatically to an appropriate den-sity. The sampling area of the original density in the AE control varies with the platen mode and the DF mode.

(1) AE sampling area in the platen mode

• While in the normal copy

• While in the auto erasure outside the original modeEntire original area detected by the original area discrimination scan (pre-scan)

(2) AE sampling area in the DF mode

6.3.4 Image processing

There are following items for the image processing. For particulars, see "25. IMAGE PROCESSING.")• AOC (Auto offset control)• AGC (Auto gain control)• Shading correction

[1] 30 mm [2] 10 mm

[1] 2 mm [3] 10 mm

[2] 2 mm

[1]

[2]

[2]

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[1][2]

[3]

[3]

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CTION

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7. WRITE SECTION

7.1 Composition

7.2 Operation

7.2.1 Laser beam path

[1] Write mirror [5] Polygon mirror

[2] CY2 lens [6] CY1 lens

[3] Drum [7] Collimator lens

[4] fθ lens [8] Laser diode

57aat2c011na

Index board (INDEXB)

CY2 lens

fθ lens

Laser drive board (LDB)

Collimator lens unit

CY1 lens

Polygon mirror

[2][4]

[5]

[6]

[3]

[7]

[8]

[1]

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7.2.2 Write control

To prevent the mis-centering of written images, the INDEX signal detected by the index board (INDEXB) is usedto decide a reference position for writing in the direction of the drum shaft (main scan direction) and control the

starting position of the laser irradiation on the drum according to the paper edge detected by the centering sen-sor (PS66).

7.2.3 Polygon control

The polygon mirror is driven by the polygon motor (M15) and the number of its rotations changes according tothe process speed that varies with the type of paper.

A. In the case of bizhub 750

NOTE

• The number of rotations of the polygon mirror for the thick paper is the same as that for the regu-

lar paper. However, to comply with the reduction in the process speed (to as much as 50%), every

other plane of the six reflection planes of the polygon mirror is used to scan the laser beam.

B. In the case of bizhub 600

NOTE

• The number of rotations of the polygon mirror for the thick paper is faster than that for the regular

paper. However, to comply with the reduction in the process speed, every other plane of the six

reflection planes of the polygon mirror is used to scan the laser beam.

7.2.4 Image stabilization control

There are following items for the image stabilization control. For particulars, see "24. IMAGE STABILIZATIONCONTROL."• MPC (Maximum power control)• APC (Auto power control)• Dot diameter adjustment control

Type of paper Process speed No. of rotations

Regular 357 mm/s 42165.35 rpm

Thick paper 178.5 mm/s 42165.35 rpm (Note)

Type of paper Process speed No. of rotations

Regular 300 mm/s 35433.07 rpm

Thick paper 178.5 mm/s 42165.35 rpm (Note)

E SECTION

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8. PHOTO CONDUCTOR SECTION

8.1 Composition

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Drum

Drum claw

Toner control sensor board (TCSB)

Suction duct

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8.2 Drive

8.2.1 Drum drive

8.2.2 Drum claw drive

[1] Toner guide roller (TGR) [4] Separation guide plate assembly

[2] Toner conveyance screw [5] Drum

[3] Drum motor (M2) [6] Toner recycle clutch (CL14)/toner convey-ance screw

[1] Drum claw oscillation cam [4] Separation guide plate assembly

[2] Drum claw solenoid (SD1) [5] Gear (drive input for oscillation)

[3] Drum claw

[2][3]

[1][6][5]

[4]

57aat2c014na

57aat2c015na

[2] [3][1]

[5] [4]

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8.3 Operation

8.3.1 Image creation control

When the print start signal turns ON [1], various types of motors turn ON to make each of the units operative. Atthis time, the erase lamp (EL) also turns ON to start to neutralize [2] the drum. And a specified period of timeafter this signal is sent, a high voltage impression is made on the charging [3], the developing bias [4], the trans-fer guide [5] and the toner guide roller (TGR) [7] to form images on the drum surface by the laser irradiation andthe developing. In parallel with the operation above, a specified period of time after completion of the formation of a loop on thepaper [6] supplied in the registration roller section, a drum ready signal [8] is generated. With this as a startingpoint, the registration clutch (CL1) turns ON. When CL1 turns on, the drive force of the registration motor (M5) istransmitted to the registration roller to start the registration conveyance [9] of the 1st sheet of paper that hasformed the loop. At this time, when the paper is fed from the trays 1 to 4, LU or ADU (only while in the doublesided copy mood), the loop motor (M6) that drives the loop roller and the ADU pre-registration roller changes theline speed into a low speed to assist [10] the loop.With this conveyance, the paper edge sensor (PS43) detects the leading edge of the paper and turns ON [11].And a specified period of time after that, it turns on successively the transfer exposure lamp [12], the high volt-age impression ON the separation [13] and the transfer [14], and the drum claw solenoid [15]. In due course oftime, the paper passes through the drum and at this time, the images formed on the drum are transferred to thepaper, and then finally the paper is separated from the drum.A series of these operations is realized by the continuous conveyance of paper, and when PS43 detects thetrailing edge of paper and it turns OFF [16], each of the operations is also turned OFF a specified period of timeafter that. However, while in the print of two or more sheets of paper, some of the operations continue for aspecified period of time after PS43 detects the trailing edge of the last sheet of paper and turns OFF [21].Paper the transfer of which has been completed is conveyed to the fusing section through the conveyance sec-tion. M5 and the fusing motor (M4) that have a bearing on the drive in this conveyance path continue to operateuntil the paper exit sensor (PS37) detects the trailing edge of the last paper and turns OFF [22].

[17][18]

Drum Ready signal of the last sheet of paperLoop assist of the last sheet of paper

[21] Detection of the trailing edge of the last sheet of paper by PS43

[19][20]

Registration conveyance of the last sheet of paper High voltage impression for the transfer of the 1st sheet of paper

[22] Detection of the trailing edge of the last sheet of paper by PS37

* Refer to the descriptions in the text for the items [1] through [16].

[21] [22] 57aat2c086na[11] [12] [15][7] [16]

[1] [2] [17][9] [10] [19][18][6] [8][3][4] [5] [13] [14] [20]

Drum motor (M2)

Developing motor (M3)

Fusing motor (M4)

Registration motor (M5)

Loop motor (M6)

Registration clutch (CL1)

Erase lamp (EL)

Charging

Transfer

Separation

Developing bias

Transfer guide

Toner guide roller (TGR)

Transfer exposure lamp (TSL)

Drum claw solenoid (SD1)

Loop sensor (PS36)

Registration sensor (PS44)

Paper edge sensor (PS43)

Paper exit sensor (PS37)

H

L

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8.3.2 Drum claw control

A. Purpose

To prevent the occurrence of a drum wrap jam, 3 drum claws are employed to prevent the drum from being

wrapped with the paper. The contact and the release of contact of the drum claws onto the drum is made byturning on and off the drum claw solenoid (SD1).

B. Oscillating operation

To prevent the paper from getting soiled in certain areas and the drum from being damaged, the drum claw con-ducts the oscillation of about 8 mm on the drum surface.There is a projection on the rear side of the separation guide plate assembly to which the drum claw is installed.A cam provided on the gear presses this projection to push the separation guide plate assembly to the frontside. When the cam is released by the rotation of the gear, the separation guide plate assembly is brought backto its former position by the spring. Repeating this operation oscillates the drum claws.

8.3.3 Cooling around the drum

The duct [3] is provided in the main scan direction of the drum [4] to exhaust heat and ozone around the drumby the developing suction fan (FM4) [1]. To prevent toner and dust contained in the exhaust from escaping intothe environment, the developing suction filter is provided between the developing suction fan [FM4] and theduct. And also, the developing cooling fan (FM12) is employed to cool down the underside of the developingunit to improve the performance of the developer.

[1] Developing suction fan (FM4) [4] Drum

[2] Developing suction filter [5] Developing cooling fan (FM12)

[3] Duct

57aat2c016na

[1]

[2]

[3]

[5]

[4]

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There are following items for the image stabilization control. For particulars, see "24. IMAGE STABILIZATIONCONTROL."

• Environmental decision control• Maximum density control• Gamma correction control

A. Environmental decision control

The temperature of the environment in which the main body is installed is detected by the thermistor providedon the toner control sensor board (TCSB), and the environmental humidity is detected by the humidity sensormounted on the back of the main body. Data thus detected are used as information to keep the image quality ata fixed level. For particulars, see "24. IMAGE STABILIZATION CONTROL."

(1) Detection timing

• When the prescribed conditions are met with the power switch (SW2) ON.

8. PHOTO C

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9. CHARGINTheory of Operation Ver1.0 Aug.2005

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9. CHARGING SECTION

9.1 Composition

9.2 Drive

[1] Charge cleaning block /Lw [4] Charge control plate

[2] Charge cleaning block /Up [5] Charge cleaning motor (M14)

[3] Charge wire

57aat2c017na

Charge control plate

Erase lamp (EL)

Back plateErase lamp (EL)

Charge wireCharge cleaning block /UpCharge cleaning

block /Lw

[5]

[4] [3] [2] [1] 57aat2c018na

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9.3 Operation

9.3.1 Charging control

A. Charge wire

The high voltage unit (HV) pressurizes 24V DC to impress a minus (-) DC voltage to the charging wire for dis-charge.Charging output range: -600 µA to -1200 µA

B. Charge grid

To make the discharge of the charging wire uniform, a minus (-) high voltage is impress from the high voltage unit(HV) to the charging grid.Charging grid voltage output range: -500 V to -1000 V

9.3.2 Wire cleaning control

A. Purpose

The wire is cleaned periodically to prevent the deterioration of the discharge characteristics caused by soiladhered to the charging wire.

B. Timing

• While in the print, executes after completion of a job for every specified number of prints.• When the environmental condition meets the prescribed condition, executes according to the predeter-

mined condition.

NOTE

• When the environmental condition meets the specified condition with the power on, no cleaning is

made.

• While in the print, the cleaning operation varies with the setting of the software DIPSW in the ser-

vice mode. For particulars, see "24. IMAGE STABILIZATION CONTROL."

9.3.3 Erase lamp control

A. Purpose

To neutralize the residual potential on the drum surface and make the potential on the drum surface uniform, theerase lamp (EL) is illuminated on the drum before charging.

B. Timing for the erase lamp to be turned on

A start signal turns ON the erase lamp (EL), and it is turned OFF a specified period of time after the last paper isdetected by the paper leading edge sensor (PS43).

9. CHARGIN

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10.TRANSFER/SEPARATION SECTION

10.1 Composition

10.2 Drive

[1] Transfer/separation cleaning motor (M10) [3] Transfer cleaning assembly and separation cleaning assembly[2] Transfer charge wire and separation charge

wire

57aat2c019na

Transfer guide plate

Wire guide /2 Wire guide /1

Separation charge wireBack plate

Separation cleaning assembly

Transfer charge wireTransfer cleaning assembly

Transfer exposure lamp (TSL)

[1]

[3]

[2]

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10.3 Operation

10.3.1 Transfer guide control

A. Purpose

To prevent the transfer guide from getting soiled, a minus (-) DC voltage is impressed from the high voltage unit(HV).Impressed voltage: -500 V

B. Timing

The impression of voltage onto the transfer guide plate is turned ON a specified period of time after a start signalis sent, and it is turned OFF a specified period of time after the trailing edge of the last paper is detected by thepaper leading edge sensor (PS43).

10.3.2 Transfer/separation control

A. Transfer

The high voltage unit (HV) pressurizes 24V DC to impress a plus (+) DC voltage onto the transfer wire for dis-charge.Transfer DC output range: 50 µA to 600 µA

B. Separation

For separation, an AC high voltage and a minus (-) DC voltage are used. The high voltage unit (HV) impresses 2separation wires for discharge.Separation AC output range: 4 kV to 5.7 kVSeparation DC output range: 0 µA to -400 µA

10.3.3 Transfer exposure lamp control

A. Purpose

The transfer exposure lamp (TSL) is turned on to secure the transferability and to prevent the reverse charge tothe drum.

B. Timing

The transfer exposure lamp turns ON a specified period of time after the paper leading edge sensor (PS43) inthe registration section turns ON, and it turns OFF a specified period of time after PS43 detect the trailing edgeof the paper.

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10.3.4 Wire cleaning control

A. Purpose

To prevent the deterioration of the discharge characteristics caused by soil adhered to the transfer wire and the

separation wire, the wire is cleaned periodically.

B. Timing

• While in the print, executes after completion of a job for every specified number of prints.• When the environmental condition meets the prescribed condition, executes according to the predeter-

mined condition.

NOTE

• When the environmental condition meets the specified condition with the power on, no cleaning is

made.

• While in the print, the cleaning operation varies with the setting of the software DIPSW in the ser-

vice mode. For particulars, see "24. IMAGE STABILIZATION CONTROL."

C. Cleaning operation

The home position of the cleaning member is provided on the front side of the machine. It operates as shownbelow.

[1] Transfer/separation cleaning limit sensor (PS53)

[3][4]

Cleaning (going)Cleaning (returning)

[2] Transfer/separation cleaning home sensor (PS52)

[5][6]

Home search (going)Home search (returning)

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[1] [2]

[3]

[4]

[5]

[6]

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11.DEVELOPING UNIT

11.1 Composition

11.2 Drive

[1] Gear for the agitator screw [5] Coupling for developing drive

[2] Gear for the agitator plate [6] Developing input gear

[3] Gear for the developing roller [7] Developing idler gear

[4] Developing motor (M3)

57aat2c022na

Developer Developer regulation blade

Agitator plate

[1]

[7][6][5]

[2][3][4]

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11.3 Operation

11.3.1 Conveyance of developer

Developer in the developing unit is supplied to the developing roller [3] by the agitator plate [2]. And developerthat adheres to the developing roller is kept at a fixed thickness by the developer regulation blade [5]. Developerthat remains on the developing roller is returned to the agitator screw [1].

11.3.2 Developing bias

A. Purpose

During developing, a developing bias voltage is impressed onto the developing roller [1] so that toner is ready toadhere to the drum. A developing bias voltage is sent from the high voltage unit (HV) to the developing bias con-tact [4] to be supplied to the developing roller [1] from the developing bias spring /Rr [3] through the bearing [2].

[1] Agitator screw [4] Drum

[2] Agitator plate [5] Developer regulation blade

[3] Developing roller

[1] Developing roller [3] Developing bias spring /Rr

[2] Bearing [4] Developing bias contact

[1][2][3]

[4] [5]

57aat2c024na

57aat2c025na[1][2][3][4]

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B. Timing

To prevent unnecessary carriers from adhering to the drum, the developing bias turns ON a specified period oftime after a print start signal is sent, and it turns OFF a specified period of time after the trailing edge of the last

paper is detected by the paper leading edge sensor (PS43).

11.3.3 Developing suction control

A. Purpose

The developing suction fan (FM4) exhausts heat around the drum and the developing roller to suck in toner scat-tered around by the rotation of the developing roller and improve the durability of developer. For the exhaustpath, see "8.3.3 Cooling around the drum."

B. Developing suction fan control

The developing suction fan (FM4) turns ON when the drum motor (M2) turns ON, and it turns OFF when the M2turns OFF.


A. Toner density control

The toner density control detects the patch density in the latent image and the developed image created undera fixed condition and controls either the number of rotations of the developing roller or the toner supply timedepending on the findings obtained by comparing it to the reference value. For particulars, see "24. IMAGE STA-BILIZATION CONTROL."

(1) Execution timing

Once every specified number of prints after the power switch (SW2) is turned ON.

B. Maximum density control

The maximum density control is a control in which the patch in the latent images written under a fixed conditionis developed while changing the number of rotations of the developing roller to obtain the number of rotation ofthe developing roller the density of which is the same as the reference density. For particular, see "24. IMAGESTABILIZATION CONTROL."


• While in the print, executed after completion of a job under the specified condition (the number of prints,and developing theta).

NOTE

• Not executed when the environmental condition meets the specified condition with the power

switch ON.

C. Gamma correction control

The gamma correction control detects the patch density in the latent image and the developed image createdunder a fixed condition to correct the amount of laser beam while in the write depending on the findingsobtained by comparing the patch density with the reference density. For particular, see "24. IMAGE STABILIZA-TION CONTROL."


• While in the print, executed after completion of a job under the specified condition (the number of prints,and developing theta).

NOTE

• Not executed when the environmental condition meets the specified condition with the power

switch ON.

11. DEVELO

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12.TONER SUPPLY SECTION

12.1 Composition

12.2 Drive

[1] Front [5] Toner bottle motor (M13)

[2] Toner supply motor (M12) [6] Toner bottle

[3] Toner conveyance screw [7] Toner conveyance screw

[4] Rear

57aat2e002na

Toner bottle

Toner hopper Toner remaining sensor (PZS)Agitator plate

[2]

[6]

[5]

[3]

[7]

[1][1][4]57aat2e003na

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12.3 Operation

12.3.1 Toner remaining detection control

A. Toner remaining detection control

The toner remaining in the toner hopper is detected by the toner remaining sensor (PZS). When the tonerremaining in the toner hopper gets below the specified amount, a toner supply signal is output to the printercontrol board (PRCB). This signal is sent to the operation board /1 (OB1) through the image processing board(IPB) and the system control board (SCB). As a result, OB1 displays a message on LCD on the LCD board(LCDB).

B. Detection timing

• When the power switch (SW2) is ON.• When the front doors /Lt and /Rt are opened and closed.• When the drum motor (M2) starts to rotate.• When the toner supply door is opened and closed.

12.3.2 Toner supply control

A. Purpose

When it is determined that the toner supply is required as a result of the toner density control, toner is supplied.For the toner density control, see "24. IMAGE STABILIZATION CONTROL."

B. Operation

When the toner supply is required as a result of the toner density control, the toner supply motor (M12) turns ONto supply toner from the toner hopper to the developing unit.

C. Timing

Toner is supplied when the trailing edge of paper in printing is detected. And the toner supply time variesdepending on the result of the toner density control and the paper size. This is normally controlled between 0 to1.49 sec. The table shown below shows the relationship between the paper size and the toner supply time.

Paper size Toner supply time (sec.)

A3 1.42

B4 1.24

8 x 13 1.14

A4 0.71

B5 0.60

B5R 0.89

A5 0.50

11 x 17 1.49

8.5 x 14 1.21

8.5 x 11 0.71

5.5 x 8.5 0.46

12. TONER S

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12.3.3 Toner conveyance control

A. Purpose

To convey toner in the toner bottle to the toner hopper.

B. Operation

The toner bottle set to the toner supply section is rotated when the toner bottle motor (M13) turns ON. When thetoner bottle rotates, toner is guided to the exit [1] of the bottle along the spiral groove carved on the surface ofthe toner bottle. When the exit of the bottle turns to the bottom, toner flows into the toner hopper [2].

[1] Exit of the bottle [3] Rotate by 90°

[2] Into the toner hopper

57aat2e004naA

AB

B

C

C

D

D

[1]

[2]

[3]

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13.CLEANING/TONER RECYCLE SECTION

13.1 Composition

13.2 Drive

[1] Drum [4] Toner recycle clutch (CL14) / toner conveyance screw[2] Toner conveyance screw

[3] Drum motor (M2) [5] Toner guide roller (TGR)

57aat2c029na

Toner recycle pipe Cleaning blade Toner guide roller (TGR)

57aat2c030na[2][3]

[5][4] [1]

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13.3 Operation

13.3.1 Toner guide roller control

A. Operation

To improve the cleaning performance of toner, a fixed voltage is impressed on the toner guide roller (TGR) [1]. Avoltage impressed on the TGR is sent to the cleaner power supply shaft /Rr [3] from the high power unit (HV) tobe supplied to TGR [1] through the power supply pin [2].Toner guide roller (TGR) output range: 0 to 50 µA

B. Timing

The impression of a voltage on the toner guide roller (TGR) turns ON a specified period of time after the start sig-nal is output, and it turns OFF a specified period of time after the trailing edge of the last paper is detected bythe paper leading edge sensor (PS43).

13.3.2 Other controls

Blade set modeAs an operation conducted after replacing the cleaning blade for the maintenance purpose, there is a blade setmode in the service mode. Executing the blade set mode prevents the curling-up of the cleaning blade by clean-ing the drum with the cleaning blade after letting toner adhere to the drum.


A. Black belt creation control

In order to stabilize the cleaning blade pressure while in the low coverage, and to prevent the trampling of paperdust, the laser is turned ON to create black band patters on the drum. For particular, see "24. IMAGE STABILI-ZATION CONTROL."

B. Execution timing

Once every 3 prints. However, this can be changed by the software DIPSW in the service mode. For particular,see "10.9.1 Software DIPSW setting" in Field Service.

[1] Toner guide roller (TGR) [3] Cleaner power supply shaft /Rr

[2] Power supply pin

57aat2c031na[1][3] [2]

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EED SECTION (trays 1 and 2)

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14.PAPER FEED SECTION (trays 1 and 2)

14.1 Composition

57aat2c032na

Pick-up roller

Feed roller Pre-registration roller Horizontal conveyance section

Feed roller

Pre-registration roller

Tray /2Lift plate

Pick-up rollerTray /1

Lift plateSeparation roller

Separation roller

Horizontal conveyance section

Tray /1 Tray /2

Pre-registration roller

Pick-up roller Feed roller Separation rollerLift plate

14. PAPER F

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14.2 Drive

14.2.1 Paper feed drive

[1] Paper feed motor (M1) [10] Pre-registration clutch /1 (CL4), /2 (CL6)

[2] Separation clutch /1 (CL21), /2 (CL22) [11] Coupling shaft /1

[3] Separation roller [12] Belt

[4] Tray 1 and 2 [13] Horizontal conveyance roller /Lt

[5] Pick-up roller [14] Horizontal conveyance clutch /Lt (CL15)

[6] Feed roller [15] Horizontal conveyance clutch /Rt (CL16)

[7] Paper feed clutch /1 (CL3), /2 (CL5) [16] Horizontal conveyance roller /Rt

[8] Coupling [17] Coupling shaft /2

[9] Pre-registration roller

57aat2c033na

[1]

[2]

[11] [12] [13] [14] [15] [16]

[17]

[3]

[5] [6] [7] [8] [9] [10]

[4]

ays 1 and 2)

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14.2.2 Tray lift drive

[1] Paper lift motor /1 (M16) [4] Lift wire

[2] Paper lift motor /2 (M17) [5] Lift plate

[3] Lift wire

57aat2c034na

[1]

[5]

[2]

[3]

[4]

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14.3 Operation

14.3.1 Up/down control

A. Up operation

The paper lift motors /1 (M16) and /2 (M17) cause the lift wires to be taken up by the pulley to raise the lift plate.

B. Down operation

When the tray is pulled out, the coupling shaft [2] of the tray is disengaged from the coupling gear [4] of thepaper lift motors /1 (M16) and /2 (M17) [3]. This bring up the lift plate [1] to release the drive force of the M16 orM17 and the lift plate goes down by its own weight.

C. Operation timing

When the tray is set, the paper lift motors /1 (M16) and /2 (M17) turn ON to bring up the lift plate. When the liftplate goes up and the upper most paper on the plate turns ON the upper limit sensors /1 (PS2) and /2 (PS8),M16 and M17 turn OFF to stop the up operation.While in the print operation, when PS2 and PS8 are turned OFF from ON by the paper feed operation, M16 andM17 turn ON again to raise the lift plate. When PS2 and PS8 are turned ON again by this operation, M16 andM17 turn OFF to stop the up operation.

[1] Lift plate [3] Paper lift motor /1 (M16), /2 (M17)

[2] Coupling shaft [4] Coupling gear

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[4]

[2]

[1]

[3]

ays 1 and 2)

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14.3.2 Paper feed control

A. Pick-up control

The up operation of the lift plate causes the paper and the pick-up roller come into contact. At this time, the

pick-up roller pressurizes the paper by its own weight.When the print start signal [1] turns ON [2] the paper feed clutches /1 (CL3) and /2 (CL5), the pick-up roller thatpressurized the paper is rotated by the rotational drive that is transmitted from the paper feed motor (M1) to pickup the paper and convey it to the feed roller. The feed roller rotates together with the pick-up roller and the paperis conveyed to the pre-registration roller. When the paper feed sensors /1 (PS1) and /2 (PS7) positioned short ofthe pre-registration roller turn ON [3], the CL3 and CL5 turn OFF [4] a specified period of time after this to stopthe rotation of the feed roller and the pick-up roller.When the 1st sheet of paper passes through PS1 and PS7 and they turn OFF [5], CL3 and CL5 turn ON [6]again to pick up the 2nd sheet of paper.

[1] Print start signal [4] Completion of the feed of the 1st sheet of paper

[2] Pick-up of the 1st sheet of paper [5] Detection of the trailing edge of the 1st sheet of paper

[3] Detection of the leading edge of the 1st sheet of paper

[6] Pick-up of the 2nd sheet of paper

[3]

[2]

[5]

[1] [4] [6]

57aat2c036na

Paper feed motor (M1)

Paper feed clutches /1, /2 (CL3, 5)

Paper feed sensors /1, /2 (PS1, 7)

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B. Separation mechanism

The separation roller [4] is driven in the direction opposite [2] to the paper conveyance [10] through the torquelimiter [1]. However, it is pressed against the feed roller [8] by the working pressure generated by the pressure [9]

of the spring [3] and the torque of the torque limiter. This working pressure of the feed roller, the separation rollerand the torque limiter becomes a limit torque for the double feed prevention of paper. When no paper is conveyed or when only one sheet of paper is convey between the separation roller and thefeed roller, the frictional force is greater than the limit torque and the separation roller is driven by the feed rollerto be rotated [5].When 2 or more sheets of paper are conveyed between the separation roller and the feed roller, the limit torqueis greater than the frictional force of these sheets of paper and the separation roller rotates in the reverse direc-tion [2] to push back the lower paper [7] in contact with the separation roller in the direction [6] of the tray, thusseparating the paper. And, the separation clutch is provided on the same shaft of the torque limiter, and toreduce the load of the torque limiter on the paper feed motor (M1), it turns ON only when paper is being fed.

[1] Torque limiter [6] To the tray

[2] Rotation in the direction for separation [7] 2nd sheet of paper

[3] Spring [8] Feed roller

[4] Separation roller [9] Pressure

[5] Driven for rotation [10] Paper conveyance direction

57aat2c037na

[8]

[3]

[4]

[5][6][7]

[2] [1]

[9] [10]

ays 1 and 2)

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C. Paper loop mechanism

Paper that passed through the feed roller [5] and the separation roller [3] is sent out to the pre-registration roller[7]. The paper thus sent out presses the actuator [1] to turn ON the paper feed sensors /1 (PS1) and /2 (PS7) [6].

By stopping the paper feed roller a specified period of time after PS1 and PS7 turn ON, the paper forms a loop[2] short of the pre-registration roller to correct the skew of paper.

D. Pre-registration control

The pre-registration roller is driven by the paper feed motor (M1) through the pre-registration clutches /1 (CL4)and /2 (CL6). Turning ON and OFF the CL4 and CL6 transmits and shuts off the drive force to rotate and stopthe motor.From the moment when the paper feed sensors /1 (PS1) and / (PS7) turn ON [2] until the paper feed clutches /1(CL3) and /2 (CL5) turn OFF [3] while in the pick-up control, CL4 and CL6 turn OFF and the pre-registration rollerstops. In this way, the paper thus conveyed from the feed roller hits against the pre-registration roller and a loopis formed to correct the skew of paper.After formation of the loop, CL4 and CL6 turn ON [4] a specified period of time after a print start signal [1] is out-put to rotate the pre-registration roller for pre-registration. At the same time, CL3 and CL5 turn ON [5] for a shortperiod of time to rotate the feed roller and assist the conveyance until the pre-registration roller nips the papersecurely.When the 1st sheet of paper passes through PS1 and PS7 and they turn OFF [6], CL4 and CL6 also turn off tocomplete the pre-registration of the 1st sheet of paper. This timing becomes a starting point for the pick-up ofthe 2nd sheet of paper [7] and the control of the pre-registration [8].

[1] Actuator [5] Feed roller

[2] Paper loop [6] Paper feed sensors 1/ (PS1), /2 (PS7)

[3] Separation roller [7] Pre-registration roller

[4] Pick-up roller

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[6] [7]

[1]

[2][3]

[5][4]

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14.3.3 Paper empty detection control

The paper empty detection in the tray is made by the paper empty sensors /1 (PS3) and /2 (PS9).

14.3.4 Remaining paper detection control

The remaining paper in the tray is detected according to the time required for the lift plate to be brought up bythe paper lift motors /1 (M16) and /2 (M17) when the tray is set. The time required for this up operation (operat-ing time of M16 and M17) is stored in the printer control board (PRCB) and the remaining paper after that isdetected by subtracting a value shown on the paper feed counter.The paper remaining thus detected is shown on the operation panel in 5 steps.

14.3.5 Horizontal conveyance control (tray 1)

Paper fed from the tray 1 is conveyed to the vertical conveyance section through the horizontal conveyance sec-tion.The horizontal conveyance rollers /Lt and /Rt are driven by the paper feed motor (M1) through each of the hori-zontal conveyance clutches /Lt (CL15) and /Rt (CL16).When the pre-registration of the 1st sheet of paper is made, CL15 turns ON a specified period of time after theprint start signal [1] is sent. In this manner, the horizontal conveyance roller /Lt rotates [2] to convey the papersent out by the pre-registration roller to the horizontal conveyance roller /Rt. When the horizontal conveyancesensor /Rt (PS6) detects the leading edge of the paper and turns ON [3], the horizontal conveyance roller /Rtrotates a specified period of time after that to convey [4] the paper to the vertical conveyance section. CL16turns OFF [5] a specified period of time after PS6 detects the trailing edge of the paper, and then it turns OFF aspecified period of time after that to complete the horizontal conveyance. The conveyance [7] of the 2nd sheetand the succeeding sheets of paper is made when CL16 turns ON a specified period of time after the drumready signal [6] is sent.

[1] Print start signal [5] Assist of the conveyance of the 1st sheet of paper


[6] Detection of the trailing edge of the 1st sheet of paper

[3] Formation of the loop of the 1st sheet of paper [7] Pick-up of the 2nd sheet of paper

[4] Pre-registration of the 1st sheet of paper [8] Pre-registration of the 2nd sheet of paper

[2] [6]

[1] [3] [4] [5] [7] [8]

57aat2c039na


Paper feed clutches /1, /2 (CL3, 5)

Pre-registration clutches /1, /2 (CL4, 6)

Separation clutches /1, /2 (CL21, 22)

Paper feed sensors /1, /2 (PS1, 7)

ays 1 and 2)

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[1] Print start signal [5] Detection of the trailing edge of the 1st sheet of paper

[2] Rotation of the horizontal conveyance roller /Lt [6] Drum ready signal


[7] Rotation of the horizontal conveyance roller /Rt for the 2nd sheet of paper

[4] Rotation of the horizontal conveyance roller /Rt for the 1st sheet of paper

[3] [5]

[1] [6][4][2] [7]

57aat2c040na


Horizontal conveyance clutch /Lt (CL15)

Horizontal conveyance clutch /Rt (CL16)

Horizontal conveyance sensor /Lt (PS5)

Horizontal conveyance sensor /Rt (PS6)


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15.PAPER FEED SECTION (trays 3 and 4)

15.1 Composition

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Pick-up roller Pre-registration roller

Feed rollerDehumidification heater /2 (HTR2)

Lift plate

Dehumidification heater /1 (HTR1)

Separation roller

ays 3 and 4)

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15.2 Drive


[1] Coupling shaft /3 [8] Pick-up roller

[2] Belt [9] Feed roller

[3] Coupling shaft /4 [10] Paper feed clutch /3 (CL7), /4 (CL9)

[4] Paper feed motor (M1) [11] Coupling

[5] Separation clutch /3 (CL17), /4 (CL18) [12] Pre-registration roller

[6] Separation roller [13] Pre-registration clutch /3 (CL8), /4 (CL10)

[7] Trays 3 and 4

57aat2c042na

[3]

[2]

[1]

[5]

[4]

[6]

[8] [9] [10] [11] [12] [13]

[7]

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[1] Paper lift motor /3 (M18) [4] Lift plate

[2] Paper lift motor /4 (M19) [5] Lift wire

[3] Lift wire

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[1]

[2]

[3]

[4]

[5]

ays 3 and 4)

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15.3 Operation


A. Up operation

The paper lift motors /3 (M18) and /4 (M19) cause the lift wires to be taken up by the pulley to raise the lift plate.

B. Down operation

When the tray is pulled out, the coupling shaft [2] of the tray is disengaged from the coupling gear [4] of thepaper lift motors /3 (M18) and /4 (M19) [3]. This brings up the lift plate [1] to release the drive force of the M16 orM17 and the lift plate goes down by its own weight.

C. Operation timing

When the tray is set, the paper lift motors /3 (M18) and /4 (M19) turn ON to bring up the lift plate. When the liftplate goes up and the upper most paper on the plate turns ON the upper limit sensors /3 (PS14) and /4 (PS20),M18 and M19 turn OFF to stop the up operation.While in the print operation, when PS14 and PS20 are turned OFF from ON by the paper feed operation, M18and M19 turn on again to raise the lift plate. When PS14 and PS20 are turned ON again by this operation, M18and M20 turn OFF to stop the up operation.


See "14.3.2 Paper feed control."

[1] Lift plate [3] Paper lift motor /3 (M18), /4 (M19)

[2] Coupling shaft [4] Coupling gear

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[4]

[2]

[1]

[3]

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15.3.3 Paper size detection control

A. Size detection in the main scan direction

The size detection of paper in the main scan direction is made according to the position of the guide plate con-

nected to the paper size VR/1 (VR3) and /2 (VR4).

B. Size detection in the sub scan direction

The size detection of paper is made by the combination of the paper size sensors /Fr1 (PS17) and /Fr2 (PS23)and the paper size sensors /Rr1 (PS18) and /Rr2 (PS24) that turn ON and OFF.


The paper empty detection in the tray is made by the paper empty sensors /3 (PS15) and /4 (PS21).


The remaining paper in the tray is detected according to the time required for the lift plate to be brought up bythe paper lift motors /3 (M18) and /4 (M19) when the tray is set. The time required for this up operation (operat-ing time of M18 and M19) is stored in the printer control board (PRCB) and the remaining paper after that isdetected by subtracting a value shown on the paper feed counter.The paper remaining thus detected is shown on the operation panel in 5 steps.

15.3.6 Dehumidification heater control

A. Purpose

To keep the humidity in the tray at a fixed state, the dehumidification heaters /1 (HTR1) and /2 (HTR2) are pro-vided.

B. Operation timing

The dehumidification heaters /1 (HTR1) and 2 (HTR2) operate when the dehumidification heater switch (SW3) isON and the power switch (SW2) is OFF.

Original size PS17, PS23ON/OFF

PS18, PS24ON/OFF

8.5 x 11 or less OFF OFF

A4R to B5R ON OFF

8 x 13 or more ON ON

ays 3 and 4)

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16.BYPASS TRAY

16.1 Composition

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Pick-up rollerPaper feed roller

Lift plate

Separation roller

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16.2 Drive



[1] Separation roller [4] Paper feed roller

[2] Belt [5] Pick-up roller

[3] Loop motor (M6)

[1] Lift plate [2] Bypass tray lift motor (M20)

[3] [2]

[1]

[5][4]

57aat2c046na

57aat2c047na

[1]

[2]

PASS TRAY

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TRAY

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16.3 Operation


A. Up operation

The bypass tray lift motor (M20) drives the fan-shaped gear to bring up the lift plate.

B. Down operation

The bypass tray lift motor (M20) drives the fan-shaped gear to bring down the lift plate.

C. Operation timing

(1) Up operation

A print start signal rotates the bypass tray lift motor (M20) in the normal direction to bring up the lift plate. Whenthe lift plate goes up and the upper most paper on the lift plate turns ON the upper limit sensor/bypass (PS34),M20 turns OFF to stop the up operation.When PS34 is turned OFF from ON by the paper feed operation, M20 turns ON again to bring up the lift plate.When PS34 is turned ON by this operation, M20 turns OFF to stop the up operation.

(2) Down operation

When there remains no paper in the bypass tray and the paper empty sensor/bypass (PS33) turns OFF, thebypass tray lift motor (M20) rotates in the reverse direction to bring down the lift plate. When the lift plate goesdown and the lower limit sensor/bypass (PS35) turns ON, M20 turns OFF to stop the down operation.

16.3.2 Paper size detection control

A. Size detection in the main scan direction

The size detection of paper in the main scan direction is made according to the position of the guide plate con-nected to the paper size VR/BP (VR5).

B. Size detection in the sub scan direction

The size detection of paper is made by the combination of the paper size sensors /Fr3 (PS31) and the papersize sensors /Rr3 (PS32) that turn ON and OFF.

Paper size PS31ON/OFF

PS32ON/OFF

8.5 x 11 or less OFF OFF

A4R to B5R ON OFF

8 x 13 or more ON ON

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A. Pick-up control

The up operation of the lift plate causes the paper and the pick-up roller to come into contact. At this time, the

pick-up roller pressurizes the paper by its own weight.When a print start signal [1] turns ON [2] the loop motor (M6), the pick-up roller that pressurized the paperrotates and pick up the paper to convey it to the paper feed roller. The feed roller rotates together with the pick-up roller and the paper is conveyed to the registration roller. When the registration sensor (PS44) provided shortof the registration roller turn ON [3], M6 turns OFF [4] a specified period of time after that to stop the rotation ofthe feed roller and the pick-up roller.When the 1st sheet of paper passes through PS44 and they turn OFF [5], M6 turns ON [6] again to pick up the2nd sheet of paper.

[1] Print start signal [4] Completion of the feed of the 1st sheet of paper

[2] Pick-up of the 1st sheet of paper [5] Detection of the trailing edge of the 1st sheet of paper


[6] Pick-up of the 2nd sheet of paper

57aat2c048na[3] [5]

[1] [2] [4] [6]

Loop motor (M6)


PASS TRAY

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TRAY

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B. Separation mechanism

The separation roller [4] is driven in the direction opposite [1] to the paper conveyance [8] through the torque lim-iter [6]. However, it is pressed against the feed roller [10] by the working pressure generated by the pressure [9]

of the spring [5] and the torque of the torque limiter. This working pressure of the feed roller, the separation rollerand the torque limiter becomes a limit torque for the double feed prevention of paper. When no paper is con-veyed or when only one sheet of paper is convey between the separation roller and the feed roller, the frictionalpressure is greater than the limit torque and the separation roller is driven by the feed roller to be rotated [3].When 2 or more sheets of paper are conveyed between the separation roller and the feed roller, the limit torqueis greater than the frictional force of these sheets of paper and the separation roller rotates in the reverse direc-tion [7] to push back the lower paper [2] in contact with the separation roller in the tray direction [1], and thepaper is thus separated.


The paper empty detection in the tray is made by the paper empty sensor/bypass (PS33).


When the paper empty sensor/bypass (PS33) turns OFF, a warning that there is no paper loaded on the bypasstray is displayed on the operation panel.

[1] To the tray [6] Torque limiter

[2] 2nd sheet of paper [7] Rotation in the direction for separation

[3] Driven for rotation [8] Paper conveyance direction

[4] Separation roller [9] Pressurization of the separation roller

[5] Spring [10] Feed roller

57aat2c049na[3][4][5][6][7]

[8]

[9]

[1][2]

[10]

16. BYPASS

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17.VERTICAL CONVEYANCE SECTION

17.1 Composition

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Vertical conveyance roller /1

Vertical conveyance door



Vertical conveyance sensor /1 (PS25)




E SECTION

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L CONVEYANCE SECTION

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17.2 Drive

[1] Vertical conveyance roller /1 [5] Belt

[2] Vertical conveyance clutch /1 (CL11) [6] Vertical conveyance roller /3

[3] Vertical conveyance clutch /2 (CL12) [7] Paper feed motor (M1)

[4] Vertical conveyance roller /2

57aat2c051na

[2]

[1]

[6]

[5]

[4]

[3]

[7]

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17.3 Operation

17.3.1 Conveyance control

A. Outline of the operation

In the vertical conveyance section, the vertical conveyance roller /1, /2 and /3 conveys paper supplied from thetrays 2, 3 and 4 to the loop roller. Paper fed from the tray 1 is also conveyed to the loop roller through the verticalconveyance section. However, the drive of this paper is made by the conveyance rollers /1 and /2 with the verti-cal conveyance roller having nothing to do with the conveyance drive.

B. Vertical conveyance of the tray 1 paper

Paper sent out from the horizontal conveyance section is conveyed to the loop roller through the upper mostsection of the vertical conveyance section. The vertical conveyance sensor /1 (PS25) is provided on the convey-ance path to detect a jam. While in the vertical conveyance from the trays 2, 3 and 4, PS25 is also used todetect a jam.

C. Vertical conveyance of the tray 2 paper

When the paper feed operation turns ON [2] the paper feed sensor /2 (PS7), the vertical conveyance clutch /1(CL11) is turned ON to transmit the drive force of the paper feed motor (M1) to the vertical conveyance roller /1.In this manner, the paper sent out by the pre-registration roller of the tray 2 is conveyed [3] to the loop roller bythe vertical conveyance roller /1. When the registration sensor (PS44) detects the leading edge of the paper andturns ON [4], CL11 turns OFF a specified period of time after that to complete the vertical conveyance of the 1stsheet of paper. The conveyance [7] of the 2nd sheet and the succeeding sheets of paper is made by turning ON[6] CL11 a specified period of time after the drum ready signal [5] is sent.

[1] Print start signal [5] Drum ready signal


[6] Start of the vertical conveyance of the 2nd sheet of paper

[3] Rotation of the vertical conveyance roller /1 for the 1st sheet of paper

[7] Rotation of the vertical conveyance roller /1 for the 2nd sheet of paper


[8] Detection of the leading edge of the 2nd sheet of paper

57aat2c052na[2] [4] [8]

[1] [3] [5] [6] [7]


Vertical conveyance clutch /1 (CL11)

Paper feed sensor /2 (PS7)


E SECTION

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D. Vertical conveyance of the tray 3 paper

(1) Conveyance of small size paper

The vertical conveyance clutch /2 (CL12) turns ON [2] a specified period of time after a print start signal [1] is

sent. In this manner, CL12 transmits the drive force of the paper feed motor (M1) to the vertical conveyanceroller /2. Paper sent out from the pre-registration roller of the tray 3 is conveyed to the vertical conveyance roller/1 by the vertical conveyance roller /2 after passing through the vertical conveyance sensor /3 (PS27). When thevertical conveyance sensor /2 (PS26) detects the leading edge of paper and turns ON [3], the vertical convey-ance clutch /1 (CL11) turns ON to transmit the drive force of M1 to the vertical conveyance roller /1. In this way,the paper is conveyed from the vertical conveyance roller /1 to the loop roller. When the registration sensor(PS44) detects the leading edge of the paper and turns ON [5], CL11 turns OFF a specified period of time afterthat to complete the vertical conveyance [4] of the 1st sheet of paper.While in the paper feed of the 2nd sheet and the succeeding sheets of paper, CL12 turns OFF at once whenPS26 turns ON and stops once at the vertical conveyance section. And then, a specified period of time after adrum ready signal [6] is sent, CL11 and CL12 turn ON [7] to convey the paper to the loop roller.


[2][3]

[4]

[5]

Rotation of the vertical conveyance roller /2Detection of the leading edge of the 1st sheet of paperRotation of the vertical conveyance roller /1 for the 1st sheet of paperDetection of the leading edge of the 1st sheet of paper

[7]

[8]

[9]

Start of the vertical conveyance of the 2nd sheet of paperRotation of the vertical conveyance roller /1 for the 2nd sheet of paperDetection of the leading edge of the 2nd sheet of paper

57aat2c053na

[8][7][6][4][2][1]

[5][3] [9]








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(2) Conveyance of large size paper

The vertical conveyance of the 1st sheet of paper is the same as the conveyance of the small size paper. How-ever, in the same manner as with the vertical conveyance clutch /1 (CL11), the vertical conveyance clutch /2

(CL12) turns OFF a specified period of time after the registration sensor (PS44) detects the leading edge of thepaper and turns ON [5].While in the paper feed of the 2nd sheet and succeeding sheets of paper, CL12 turns ON a specified period oftime after a drum ready signal [6] and the vertical conveyance roller /2 conveys [7] the 2nd sheet of paper to thevertical conveyance roller /1. In this manner, when vertical conveyance sensor /2 (PS26) detects the leadingedge of the paper and turns ON [8], CL12 turns OFF to stand by for paper at the position short of PS26. And aspecified period of time after a drum ready signal is sent, CL11 and CL12 turn ON to resume the vertical con-veyance [9] of the end sheet of paper.

E. Vertical conveyance of the tray 4 paper

(1) Conveyance of small size paper

Same as "(1) Conveyance of small size paper" of "D. Vertical conveyance of the tray 3 paper." However, the ver-tical conveyance clutch /2 (CL12) turns ON a specified period of time after the vertical conveyance sensor /4(PS28) turns ON.

(2) Conveyance of large size paper

Same as "(2) Conveyance of large size paper" of "D. Vertical conveyance of the tray 3 paper." However, while inthe conveyance of the 1 sheet of paper, the vertical conveyance clutch /2 (CL12) turns ON a specified period oftime after the vertical conveyance sensor /4 (PS28) turns ON.


[2][3]

[4]

[5]

Rotation of the vertical conveyance roller /2Detection of the leading edge of the 1st sheet of paperRotation of the vertical conveyance roller /1 for the 1st sheet of paperDetection of the leading edge of the 1st sheet of paper

[7]

[8]

[9]

[10]

Rotation of the vertical conveyance roller /2 for the 2nd sheet of paperDetection of the leading edge of the 2nd sheet of paperRotation of the vertical conveyance roller /1 for the 2nd sheet of paperDetection of the leading edge of the 2nd sheet of paper

57aat2c054na

[9][7][6][4][2][1]

[5] [10][3] [8]








E SECTION

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ATION SECTION

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18.REGISTRATION SECTION

18.1 Composition

57aat2c055na

Centering sensor (PS66)

Pre-transfer roller /Up Pre-transfer roller /Lw

Registration roller

18. REGISTR

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18.2 Drive

18.2.1 Registration drive

18.2.2 Loop roller drive

[1] Registration clutch /1 (CL1) [4] Registration roller

[2] Front [5] Pre-transfer roller /Lw

[3] Registration motor (M5) [6] Pre-transfer roller /Up

[1] Loop roller [3] Loop motor (M6)

[2] Belt

[4]

[5]

[6]

[1]

[2]

[3] 57aat2c056na

[3] [2]

[1]

57aat2c057na

N SECTION

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ATION SECTION

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18.3 Operation

18.3.1 Loop control

A. Registration path

When paper supplied from the trays 1 to 4 [2], LU [1], the bypass tray [14] and ADU [5] hits against the registra-tion roller [7], a loop [12] is formed until the roller provided just in front of the registration roller on each convey-ance path turns OFF. And a paper skew is adjusted by this loop.The rollers provided just in front of the registration rollers on each of the conveyance paths are as shown below:• Trays 1 to 4: Loop roller [3]• LU: Loop roller [3]• Bypass tray: Feed roller [13] for bypass feed• ADU: ADU pre-registration roller [4]

Each of these rollers is driven by the loop motor (M6) and the paper loop is controlled by the registration sensor(PS44) [6] provided just in front of M6 and the registration roller.

[1] LU paper conveyance path [8] Pre-transfer roller /Lw

[2] Trays 1 to 4 paper conveyance path [9] Drum

[3] Loop roller [10] Pre-transfer roller /Up

[4] ADU pre-registration roller [11] Paper edge sensor (PS43)

[5] ADU paper conveyance path [12] Loop

[6] Registration sensor (PS44) [13] Feed roller for the bypass tray

[7] Registration roller [14] Bypass tray paper conveyance path

[1][2][4][5]

[6][7]

[8]

[9] [10] [12][11] [13] [14]

[3] 57aat2c058na

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B. Registration operation

(1) While in the paper feed from the trays 1 to 4, LU and ADU

A specified period of time after the print start signal [1] is sent, the loop motor (M6) turns ON to drive [2] the loop

roller and the ADU pre-registration roller at a high process speed. The registration sensor (PS44) detects theleading edge of paper conveyed from each of the rollers and turns ON [3]. And a specified period of time afterthat, M6 turns OFF. At this time, the paper is conveyed for a specified period of time after it hits against the reg-istration roller and a loop [4] is formed to correct the skew of the paper.When a drum ready signal [5] is generated, the registration clutch (CL1) turns ON to transmit the drive force ofthe registration motor (M5) to the registration roller. At the same time, M6 also turns ON. However, the processspeed is the same low speed as that of the registration roller to drive each of the rollers. In this way, the registra-tion [8] of the paper is made by the registration roller while receiving a loop assist [6] from each of the rollers. Andthe moment the print start signal is sent, M5 turns ON and drive the pre-transfer rollers /Up and /Lw at all times.Paper sent out from the registration roller is conveyed to the drum by these rollers.When, the registration let the loop sensor (PS36) or ADU pre-registration sensor (PS50) detect the trailing edgeof paper and turns OFF [7], M6 changes the rotation from low speed to high speed to feed [9] the next paper.And when PS44 detects the trailing edge of paper and turns OFF [10], M6 and CL1 also turns OFF a specifiedperiod of time after that to complete the registration operation.

(2) While in the paper feed from the bypass tray

While in the paper feed from the bypass tray, the loop motor (M6) drives the feed roller at the process speed forthe bypass tray. The registration operation is the same as that of "(1) While in the paper feed from the trays 1 to4, LU and ADU." However, to comply with the paper feed of special paper, no loop assist is made.And while in the postcard mode and the thick paper mode, the process speed varies with the registration rollerand the pre-transfer rollers /Up and /Lw that are driven by the registration motor (M5).

[1] Print start signal [6] Loop assist

[2] High speed drive of the loop roller/ADU pre-registration roller

[7] Detection of the trailing edge of paper

[8] Registration

[3] Detection of the leading edge of paper [9] Paper feed of the next paper

[4] Loop [10] Detection of the trailing edge of paper

[5] Drum ready signal

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[9][6] [8][5][4][2][1]

[3] [7] [10]


Loop motor (M6)

Registration clutch (CL1)

Loop sensor (PS36)ADU pre-registration sensor (PS50)


High speed

Low speed

N SECTION

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18.3.2 Paper mis-centering correction control

To detect the mis-centering of paper after the registration, the paper leading edge sensor (PS43) and the center-ing sensor (PS66) are provided at the exit of the registration roller. PS43 detects the positional information in the

sub scan direction and PS66 detects it in the main scan direction. The positional information obtained by thesesensors is processed at the image processing section and adjusted prior to writing so that the image data cor-responds to the position.

18. REGISTR

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19.HORIZONTAL CONVEYANCE SECTION

19.1 Composition

19.2 Drive

[1] Registration motor (M5) [3] Thick paper support belt

[2] Front [4] Conveyance belt

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Thick paper support belt

Transfer/sepa-ration suction fan (FM3)

Conveyance belt

[4]

[1]

[2]

[3]

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19.3 Operation


A. Conveyance suction

The duct [3] provided at the center of the conveyance section sucks paper passing through the conveyancesection to convey it. The suction opening [4] is provided at the lower section of each conveyance belt [2] and thesuction is made by the transfer/separation suction fan (FM3) [1] connected to the duct.

[1] Transfer/separation suction fan (FM3) [3] Duct

[2] Conveyance belt [4] Suction opening

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[4]

[3][2]

[1]

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B. Duct path

The duct [3] in the conveyance section [2] is connected to the transfer/separation suction fan (FM3) [1] at thelower section of the conveyance section. FM3 sucks through the duct and discharges the exhaust into the main

body.

C. Fan control

The transfer/separation suction fan (FM3) turns ON and OFF in accord with the ON and OFF operation of thedrum motor (M2).

[1] Transfer/separation suction fan (FM3) [3] Duct

[2] Conveyance section

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[3]

[2]

[1]

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19.3.2 Thick paper support mechanism

In order to support the conveyance of the thick paper, the thick paper support belt [11] is provided. The thickpaper support belt is normally [3] set at the same position in height as the conveyance belt [2]. When the set

lever [5] is changed over to the thick paper mode side [4] by the manual operation, the edge of the thick papersupport belt is raised. In this way, the drive force can be transmitted to the trailing edge of paper while in theconveyance of the thick paper.

[1] Thick paper support belt [4] Position in the thick paper mode

[2] Conveyance belt [5] Set lever

[3] Normal position

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[2]

[1]

[5]

[4]

[3]

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20.ADU

20.1 Composition

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ADU conveyance roller /1 ADU conveyance roller /2

Reverse/exit gate

Reverse/exit roller

ADU gate

ADU conveyance roller /3

ADU conveyance roller /4

ADU pre-registration roller

ADU reverse roller

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20.2 Drive

20.2.1 ADU conveyance roller drive

20.2.2 ADU reverse roller drive

[1] Registration motor (M5) [5] ADU conveyance roller /1

[2] ADU deceleration clutch (CL2) [6] ADU conveyance roller /2

[3] ADU conveyance clutch (CL13) [7] ADU conveyance roller /3

[4] Front [8] ADU conveyance roller /4

[1] Front [3] ADU reverse roller

[2] ADU reverse motor (M9)

[8]

[1]

[2]

[3]

[6]

[4]

[7]

[5]

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[3]

[2]

[1]

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20.2.3 ADU pre-registration roller drive

20.2.4 Reverse/exit roller drive

[1] ADU pre-registration roller [2] Loop motor (M6)

[1] Reverse/exit roller [3] Reverse/exit motor (M8)

[2] Front

[2] [1]57aat2c068na

[1]

[2]

[3]

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20.3 Operation


A. Conveyance path

While in the double sided print mode, paper that has been printed on the front side passes through the reverse/exit switching gate [5], and then it is conveyed to the ADU reverse roller [1] through the underside of the reverse/exit gate [4], the reverse/exit roller [3] and the ADU gate [2]. When the reverse/exit sensor (PS46) [7] detects the trailing edge of paper, the ADU reverse roller rotates in thereverse direction to send back the paper. At this time, the ADU gate is closed and the paper passes through theupper side of this gate to be conveyed to the ADU conveyance roller /1 [6]. In this way, the paper is turned overwithout being stacked in the ADU. The paper thus turned over is conveyed to the ADU pre-registration roller [12]by the ADU conveyance rollers /1, /2 [8], /3 [9] and /4 [10].

[1] ADU reverse roller [7] Reverse/exit sensor (PS46)

[2] ADU gate [8] ADU conveyance roller /2

[3] Reverse/exit roller [9] ADU conveyance roller /3

[4] Reverse/exit gate [10] ADU conveyance roller /4

[5] Reverse/exit switching gate [11] ADU pre-registration sensor (PS50)

[6] ADU conveyance roller /1 [12] ADU pre-registration roller

[1][2]

[3]

[4]

[5] [6] [8][7] [9] [10] [11] [12]

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B. Pre-registration control

In the double sided print mode, when the ADU pre-registration sensor (PS50) detects the leading edge of paperand turns ON [2], the ADU deceleration clutch (CL2) turns OFF a specified period of time after this to shut off the

drive force of the registration motor (M5) that has been transmitted to the ADU pre-registration roller 13 and 14.At this time, the loop motor (M6) that drives the ADU pre-registration roller is turned OFF. In this way, the paperhits against the ADU pre-registration roller to form a loop. And the skew of the paper is corrected by this loop.

[1] Conveyance of the rear side of paper [3] Loop

[2] Detection of the leading edge of paper

[2]

[1] [3]

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ADU deceleration clutch (CL2)

Loop motor (M6)

ADU pre-registration sensor (PS50)

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21.FUSING SECTION

21.1 Composition

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Fusing claw /Up


Cleaning web

Fusing roller /Up

Decurler roller

Fusing claw /Lw

Fusing roller /Lw



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21. FUSINTheory of Operation Ver1.0 Aug.2005

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21.2 Drive

21.2.1 Fusing drive

21.2.2 Cleaning web drive

[1] Fusing motor (M4) [4] Fusing exit roller

[2] Fusing roller /Lw [5] Fusing roller /Up

[3] Decurler roller [6] Fusing input gear

[1] Web solenoid (SD2) [4] Cleaning web wind-up shaft

[2] Ratchet mechanism [5] Cleaning web unwinding shaft

[3] Front

[1][2][3]

[4]

[6][5]

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[4]

[2]

[3]

[5] [1]

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21.2.3 Reverse/exit switching gate drive

[1] Reverse/exit switching gate [2] Reverse/exit solenoid

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[1]

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21.3 Operation

21.3.1 Web solenoid control

A. Cleaning web mechanism

Turning ON and OFF the web solenoid (SD2) [1] rotates in the ratchet mechanism section [2]. The drive forcethus generated is transmitted to the cleaning web wind-up shaft [3] through the gear to wind up the cleaningweb. The cleaning web contains silicone oil and the pressure roller [4] allows it to come into contact with the fus-ing roller /Up to clean the roller surface. The feed per revolution of the cleaning web is about 0.04 to 0.05 mm/print.

B. Operation timing

The web solenoid (SD2) turns ON and OFF based on the turning ON of the fusing exit sensor (PS30) when thepaper passes through it. However, in order to make the wind-up amount of the cleaning web per print at a fixedrate, the number of prints is changed, which operates according to the print count value by cleaning web partsthat are required to be replaced. The following shows the count value of the cleaning web and the number ofoperations of the SD2.

[1] Web solenoid (SD2) [4] Pressure roller

[2] Ratchet mechanism [5] Cleaning web unwinding shaft

[3] Cleaning web wind-up shaft

Count value of the cleaning web Number of operations of SD2

1 to 350,000 Operates according to the prescribed table values.

350,000 or more * Stops.

* Be sure to replace the cleaning web at the number of 250,000 prints. The performance of the cleaning webis not necessarily guaranteed up to 350,000 prints.

[3]

[2]

[4]

[5][1]

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21.3.2 Fusing temperature control

The heating of the fusing roller /Up is made by the fusing heater lamp/1 (L2) and /2(L3) and the heating of thefusing roller /Lw by the heater lamp/3 (L4).

The surface temperature of the fusing roller /Up is detected by the thermistors /1 (TH1) [2] and /2 (TH2) [1]. Tem-perature of the fusing roller/Lw is not specifically detected. For TH1 of these thermistors, an NC sensor superiorin the speed of detection is employed.The printer control board (PRCB) controls the fusing temperature as the DC power source/1 (DCPS1) turns L2and L3 ON or OFF based on the surface temperature of the fusing roller/Up detected by TH1.

A. Warm-up

While in the warm-up, the fusing heater lamp/1 (L2), /2 (L3), and /3 (L4) are turned ON. They are turned OFFwhen the fusing roller/Up surface temperature reaches the specified value. However, L2, L3 and L4 are notturned ON at the same time to prevent flickering.

B. While in the print or while in the stand-by

The setting temperature of the fusing roller /Up varies with the type of paper, its size, the print mode or otherconditions. A control is made by turning on and off the fusing heater lamp /1 (L2) and /2 (L3) so that a prescribedtemperature can be obtained at all times. However, L2, L3 and L4 are not turned ON at the same time to preventflickering.

C. Power save mode

There are 2 modes available for the power save mode: sleep mode and low power mode. In the sleep mode, thepower is not supplied to the fusing heater lamp/1 (L2), /2 (L3) and /3 (L4). In the low power mode, a control ismade by turning L2, L3 and L4 ON/OFF so that the temperature is kept at a prescribed set temperature lowerthan that seen while in the stand-by mode. However, L2, L3 and L4 are not turned ON at the same time to pre-vent flickering.

[1] Thermistor /2 (TH2) [2] Thermistor /1 (TH1)

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[1] [2]

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21.3.3 Protection against abnormality

When the temperature detected by the thermostats /3 (TS3) [1] gets to 180 ± 7°C, the AC power line to the fus-ing heater lamp/1 (L2) and /2 (L3) is cut off to turn off L2 and L3. When the temperature to detect the thermostat

/4 (TS4) [2] reaches 110 ±10°C, the AC power line to the fusing heater lamp/3 (L4) is cut off to turn L4 OFF. Thethermistors /1 (TH1) [4] and /2 (TH2) [3] detect the temperature of the fusing roller/Up at the center and on bothends at a specified interval. When an abnormal temperature is detected, the power supply to L2, L3 and L4 isturned off with a trouble cord displayed on the operation panel. For details of the abnormality detected, see thetrouble codes.

[1] Thermostat /3 (TS3) [3] Thermistor /2 (TH2)

[2] Thermostat /4 (TS4) [4] Thermistor /1 (TH1)

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[1][4][3]

[2]

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DCPS1

ACdrivesection

Controlsection

RL1

PRCBADUDB

ACcontrolsection

RLdrivesection

CBR1

CBR2

TS3

TS4

L2

TH1

TH2

RL1

L3

L4

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21.3.4 Fusing conveyance mechanism

A. Decurler roller

Paper guided by the reverse/exit switching gate [4] passes through between the decurler roller [2] and the

restriction shaft [3] for decurl.

B. Reverse/exit switching gate

The reverse/exit switching gate is driven by the reverse/exit solenoid (SD7) to switch over the exit path for papersent out from the fusing exit roller.

[1] Fusing exit roller [3] Restriction shaft

[2] Decurler roller [4] Reverse/exit switching gate

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[3]

[4]

21. FUSING

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22.REVERSE/EXIT SECTION

22.1 Composition

22.2 Drive

[1] Paper exit motor (M7) [3] Main body paper exit roller

[2] Paper exit conveyance roller

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Reverse/exit switching gate

Fusing exit roller

Main body paper exit roller

Paper exit conveyance roller

Reverse/exit gate Decurler

rollerPaper exit conveyance roller

Main body paper exit roller

[2]

[3] [1]

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22.3 Operation


A. Reverse/exit switching gate

The reverse/exit switching gate is turned ON and OFF by the reverse/exit solenoid (SD7) to switch the convey-ance path for paper exited from the fusing exit roller over to either the straight paper exit or the reverse paperexit.

B. Conveyance path

(1) Straight paper exit

While in the straight paper exit, the reverse/exit switching gate [2] is closed when the reverse/exit solenoid (SD7)turns ON. So, paper exited from the fusing exit roller [1] is conveyed to the main body paper exit roller [3] pass-ing over the reverse/exit switching gate.

[1] Fusing exit roller [3] Main body paper exit roller

[2] Reverse/exit switching gate

[1]

[2]

[3]

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(2) Reverse paper exit

While in the reverse paper exit and the ADU paper feed, the reverse/exit switching gate [9] is opened when thereverse/exit solenoid (SD7) turns OFF. Paper exited from the fusing exit roller [2] is conveyed to the reverse/exit

gate [6] of ADU by the decurler roller [3] passing through the underside of the reverse/exit switching gate. Thereverse/exit gate is normally closed. However, the elasticity of paper opens it to convey the paper to the reverse/exit roller [4] and the ADU reverse roller [1]. While in the ADU paper exit, paper is conveyed until the trailing edgeof paper passes through the reverse/exit roller.When the paper reverse sensor (PS42) [5] detects the trailing edge of paper and turns OFF, the reverse/exit rollerand the ADU reverse roller rotate in reverse to send the paper back to the reverse/exit gate side. At this time, thereverse/exit gate is closed and the paper is conveyed to the paper exit conveyance roller [7] side, not to thedecurler side. In this way, the paper is turned over to be exited from the main body paper exit roller [8].

[1] ADU reverse roller [6] Reverse/exit gate

[2] Fusing exit roller [7] Paper exit conveyance roller

[3] Decurler roller [8] Main body paper exit roller

[4] Reverse/exit roller [9] Reverse/exit switching gate

[5] Paper reverse sensor (PS42)

[1]

[9]

[4][5]

[6]

[7]

[8]

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[2]

[3]

IT SECTION

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23. INTERFACE SECTION

23.1 Composition

23.2 Operation

23.2.1 Interface specifications

Item Specifications/mechanism

Serial port (RS-232C) For service of system control board

Compact flash card For storage of firmware

Serial port (RS-232C) For service of image processing board

RJ45 Ethernet connector PS JobEditor

Serial port (RS-232C) D-SUB 9-pin connector, for hyper terminal

USB port (USB TypeB) For ISW of copier/printer

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Serial port (RS-232C)

RJ45 Ethernet connector


USB port (USB TypeB)

Compact flash card


23. INTERFA

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24. IMAGE STABILIZATIONTheory of Operation Ver1.0 Aug.2005

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24. IMAGE STABILIZATION CONTROL

24.1 Outline

In order to realize the top quality print images at all times, this machine conducts various types of control forimage stabilization. The operation of the image stabilization control varies depending on whether the powerswitch (SW2) is turned ON and the print is in operation.

24.2 Operation flow

24.2.1 Image stabilization control flow when the power switch (SW2) is ON

The following shows the operation flow of the image stabilization control when the power switch (SW2) is turnedON. However, this flow indicates an example in bizhub 750 in which the warm-up is made for 180 sec. in theprescribed environment.

NOTE

• Depending on the environmental condition, the cleaning of the charge and the transfer/separation

charge is made. Charge cleaning cycle varies with the number of prints set of the DIPSW2-4 and

2-5.

A. Charge cleaning


• When the specified conditions are met upon the power ON, the charge and transfer/separation charge arecleaned.

B. Pre-rotation of drum control

(1) Purpose

• To prevent the drum charge leak such as an image flow while in the high humidity.• When left at a low or normal humidity, to prevent an uneven density due to the difference in sensitivity

between the areas facing the cleaner and developing unit of the drum and other areas.


• When the environmental condition at the time of the power switch (SW2) being turned ON meets the pre-scribed condition, rotate the drum for a specified period of time after starting the OS.

Power on

A. Charge cleaning

B. Pre-rotation of the drum

C. MPC/APC

D. Maximum density correction

E. Gamma correction

F. Environmental decision

CONTROL

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C. Maximum density correction

(1) Purpose

• According to "24.2.2 Image stabilization control flow while in the print and after completion of the print.."


• After completion of the preliminary rotation of the drum

D. Gamma correction

(1) Purpose

• According to "24.2.2 Image stabilization control flow while in the print and after completion of the print.."


• After completion of the maximum density adjustment

E. Environmental decision control

(1) Purpose

To detect the ambient temperature and humidity and feed back the findings to the various types of controls tomaintain the image at a fixed quality.

(2) Method

The temperature sensor is provided on the toner control sensor board (TCSB) and the humidity sensor (HUM)provided at the bottom of the printer control board (PRCB).


With the power switch (SW2) ON, when the time the machine is left unused after SW2 was turned OFF last timeis more than the specified period of time and the fusing temperature meets the prescribed condition, the envi-ronmental condition is decided based on the measurement values of the sensors.

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24.2.2 Image stabilization control flow while in the print and after completion of the print.

The following shows the flow of the image stabilization controls taken while in the print and after completion ofthe print.


(1) Method

• Develop a toner patch on the drum once for every 6 prints after the power switch (SW2) turns ON, and readthe patch density with the maximum density sensor.

• When the patch density is lower than the reference value, the operation varies depending on the developingtheta (developing roller line speed/drum line speed).a. When the developing theta is lower than the reference value: Increase the number of rotations of the

developing roller for control according to the patch density.b. When the developing theta is at the reference value: Drive the toner supply motor (M12) only for the

period of time calculated based on the patch density and the paper size to replenish toner.

Print start signal

Start of signal


B. Black belt creation control

C. Charge cleaning D. Dot diameter correction control

E. Maximum density control

End of print

Stand-by

F. Gamma correction control

a: After completion of the last job for each specified prints and when the developing theta gets to

the reference value.

b: After completion of the last job other than the above.

b a

CONTROL

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B. Black belt creation control

(1) Purpose

To stabilize the load on the cleaning blade, coat the entire drum image area with toner before cleaning the clean-

ing blade.

(2) Method

Create a black belt of 0.5 mm in width on the drum corresponding to the position about 20 mm from the leadingedge of the preceding paper.


• Create once for every 3 prints.• The execution timing can be changed with DIPSW12-0.

C. Charge cleaning


• When the print count after the previous cleaning has exceeded the specified value upon the power switch(SW2) ON.

• Cleaning is executed after completion of a job for every specified number of print count during the printingoperation.

D. Dot diameter correction control

(1) Purpose

To prevent the laser 1 dot diameter from changing due to the write system being stained or the change in thedeveloping performance, and to obtain a stable image quality for a long period of time.

(2) Method

• Create multiple dot pattern patches of a fixed density on the drum by changing the laser power value. Atthis time, create the patches while changing the MPC value with the laser PWM maximum.

• Read this dot pattern patch with the gamma sensor and store as the MPC value the laser power valueobtained when the sensor output gets to the prescribed value. Until the next adjustment, use this setting asthe MPC value.


Execute each time the prescribed number of prints is made in the PM counter and after completion of the jobwhen the developing theta gets to the reference value.

E. Maximum density control

(1) Purpose

To maintain the image at a fixed maximum density without being negatively affected by the environmental condi-tion and the number of prints.

(2) Method

• Create multiple toner patches on the drum while changing the rotation of the developing roller. At this time,create patches with the laser exposure time per dot (laser PWM) maximum.

• Read this patch with the maximum density sensor and store the number of rotations of the developing rollerwhen the sensor output gets to the prescribed value, and use this number of rotations to create the image.


Execute each time the prescribed number of prints is made in the PM counter and after completion of the jobwhen the developing theta gets to the reference value.

24. IMAGE S

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F. Gamma correction control

(1) Purpose

To maintain the image at a fixed gradation without being negatively affected by the environmental condition and

the number of prints.

(2) Method

• Create multiple toner patches on the drum while changing the laser PWM. At this time, create patches withthe number of rotations of the developing roller decided at the maximum density control.

• Read this patch with the gamma sensor and create a gamma curve by calculation.


• Executed after completion of the job each time the specified number of prints are made in the PM counterand also when the developing theta gets to the reference value.

CONTROL

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25. IMAGE PROCESSING

25.1 Image processing in the scanner section

25.1.1 Shading correction

This is a measure to obtain an even distribution of light of the CCD. The following corrections are made at theprescribed timing.

A. White correction

The output voltage of each pixel of the CCD sensor when the white reference plate is exposed to the exposurelamp (L1) is stored as the maximum output value of the pixel.

B. Black correction

The output voltage of each pixel of the CCD sensor when the exposure lamp (L1) is turned off is stored as theminimum output value of the pixel.

C. Shading correction

Based on the difference between the white data and black data for each pixel stored in the white correction andthe black correction, the result of calculation that the image data read from the original falls on what step in thisrange is output in the 10 bits accuracy.

A. Shading correction

B. AE correction

C. Area discrimination

D. Brightness/density conversion

E. Filter /magnification and contraction

F. Density gamma (conversion)

G. Tilt adjustment

H. Compression

I. Storage of image data

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25.1.2 AE processing

The AE control selects automatically a density suitable for the original density and the copy is made properly.

A. Sampling area

(1) While in the platen mode

• While in the normal copy

• While in the auto erase outside original modeEntire original area detected by the original area discrimination scan (pre-scan)

(2) While in the DF mode

B. Execution timing

• While in the platen print: At the time of the pre-scan before the actual scan when the print or the read starts.• While in the DF print: At the same time as when the original is read.

[1] 30 mm [2] 10 mm

[1] 2 mm [3] 10 mm

[2] 2 mm

[1]

[2]

[2]

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[3]

[3]

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25.1.3 Area discrimination

To make a copy of the original under the appropriate condition (to make an appropriate filter processing), checkthe read section to see if it is a character or a dot picture, and use the results in the image processing section at

the later stage.

25.1.4 Brightness/density conversion

The signal obtained after the shading correction is a signal corresponding to the light reflected from the original,and this is normally called a brightness signal. In this brightness/density conversion section, the brightness sig-nal of 1024 stages is converted into the density of 225 stages.

25.1.5 Filter/magnification and contraction

A. Filter processing

An appropriate filter processing is made according to the type of the original and the magnification selected.• Character: Make the shading of the original conspicuous.• Dot section: Suppress moire.• Picture: Increase the reproducibility of gradation.

B. Magnification and contraction

For this machine, the magnification and contraction in the sub scan direction is made by the scan speed of theexposure unit (in the platen mode) or the conveyance speed of DF (in the DF mode), and the magnification andcontraction in the main scan direction is made by processing images electrically.

25.1.6 Density gamma (conversion)

To the data obtained after the filter/magnification and contraction processing, select a density curve correspond-ing to the density button selected on the operation panel. An appropriate density curve is provided for each ofthe character/picture/character and the picture/thin character modes.

25.1.7 Tilt adjustment

Detect an uneven original skew amount for each DF original with the DF original conveyance sensor (PS306) andthe original skew sensor (PS307), and adjust the skew amount detected with the sensors while shifting theimage data in the image processing.

25.1.8 Compression

To store more image data, data is stored temporarily in the image memory after the images have been com-pressed.The memory of 256 MB is equipped as a standard. However, this can be expanded up to 512 MB by installingEM-701 optionally.

25.1.9 Storage of image data

The image/setting of the originals read by the scanner or the images sent from the IC can be stored as a file inthe optional hard disc.

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25.2 Image processing in the write section

25.2.1 Elongation/rotation

When outputting images from the memory, elongate the compressed data to restore them to their original state.Rotate the image in the direction of 90 degrees or 180 degrees as required.

25.2.2 1dotPWM

While in the normal mode, the laser writing is made in 1bitED (2-value error diffusion).

25.2.3 Frequency conversion

Write in the memory once the data obtained after the PWM conversion, and read it in accordance with the writeclock signal of the printer.

A. Elongation/rotation

B. 1dotPWM

C. Frequency conversion

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26.OTHERS

26.1 Fan control

26.1.1 Composition

[1] Developing suction fan (FM4) [9] Cleaner cooling fan (FM5)

[2] Developing cooling fan (FM12) [10] Polygon cooling fan (FM2)

[3] Power supply cooling fan /1 (FM16) [11] Scanner cooling fan (FM9)

[4] Power supply cooling fan /2 (FM15) [12] Paper exit fan (FM8)

[5] Exhaust fan /Rr (FM19) [13] Cooling fan /1 (FM1)

[6] Transfer/separation suction fan (FM3) [14] HDD cooling fan (FM21): optional

[7] ADU cooling fan (FM10) [15] CPU cooling fan (FM20)

[8] Suction fan /Fr (FM6)

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[1]

[2]

[3]

[4][5][6]

[7]

[8]

[9]

[10] [11] [12] [13] [14]

[15]

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26.1.2 Operation

A. Cooling fan /1 (FM1) control

(1) Purpose

To exhaust around the drum and the fusing section.

(2) ON timing

• While in the warm-up, turns ON (rotates at a low speed) in accord with the drum motor (M2).• While in the idle, turns ON at all times.• While in the print, rotates at a high speed in accord with M2, and rotates at a low speed a specified period

of time after completion of the print.

(3) OFF timing

• While in the warm-up, turns OFF in accord with M2.• After completion of the warm-up, does not turn OFF until the power switch (SW2) is turned OFF.

B. Polygon cooling fan (FM2) control

(1) Purpose

To cool down around the polygon motor (M15) and the write section.

(2) ON timing

• Turns ON (rotates at a low speed) in accord with the polygon motor (M15).• While in the warm-up and during idling, turns ON (rotates at a low speed) at all times.• While in the print, rotates at a high speed in accord with the fusing motor (M4) and rotates at a low speed

when the drum motor (M2) turns OFF.

(3) OFF timing

After completion of the warm-up, does not turn OFF until the power switch (SW2) is turned OFF.

C. Transfer/separation suction fan (FM3) control

(1) Purpose

To exhaust around the transfer/separation corona unit and the conveyance section.

(2) ON timing

• While in the warm-up and the print, turns ON in accord with the drum motor (M2).

(3) OFF timing

• While in the idle, turns OFF at all times.• While in the warm-up and the print, turns OFF in accord with the turning-OFF of M2.

D. Developing suction fan (FM4) control

(1) Purpose

To collect toner scattered from the developing unit into the developing suction filter.

(2) ON timing

• While in the warm-up and the print, turns ON in accord with the drum motor (M2).

(3) OFF timing

• While in the idle, turns OFF at all times.• While in the warm-up, in the print and after completion of print, turns OFF in accord with the turning-OFF of

M2.

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E. Cleaner cooling fan (FM5) control

(1) Purpose

To cool down around the cleaning section.

(2) ON timing

Turns ON a specified period of time after the power switch (SW2) turns ON.

(3) OFF timing

Not to turn OFF until the power switch (SW2) is turned OFF.

F. Suction fan /Fr (FM6) control

(1) Purpose

To cool down around the paper exit section and the fusing section with suction.

(2) ON timing

Turns ON in accord with the drum motor (M2) only when the 1st sheet of paper is fed.While in the print, turns ON if it is in the single sided print mode when the fusing exit sensor (PS30) turns ON fordetection.

(3) OFF timing

Turns OFF a specified period of time after the paper exit sensor (PS37) turns OFF.

G. Exhaust fan /Rr (FM19) control

(1) Purpose

To cool down around the paper exit section and the fusing section with exhaust.

(2) ON timing

While in the print, turns ON if it is in the double sided print mode with the temperature inside the machine inexcess of a fixed temperature when the fusing exit sensor (PS30) turns ON for detection.

(3) OFF timing


H. Paper exit fan (FM8) control

(1) Purpose

To cool down around the paper exit section with exhaust.

(2) ON timing

While in the print, turns on in accord with the drum motor (M2).

(3) OFF timing


I. Scanner cooling fan (FM9) control

(1) Purpose

To cool down around the exposure lamp (L1) and the scanner.

(2) ON timing

Turns ON in accord with the turn ON of the exposure lamp (L1).

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(3) OFF timing

Turns OFF in accord with the turn OFF of the exposure lamp (L1).

J. ADU cooling fan (FM10) control

(1) Purpose

To cool down around the ADU reverse motor (M9) and the ADU reverse section.

(2) ON timing

Turns ON in accord with the turn ON of the ADU reverse motor (M9).

(3) OFF timing

Turns OFF in accord with the turn OFF of the ADU reverse motor (M9).

K. Developing cooling fan (FM12) control

(1) Purpose

To cool down around the developing unit with suction.

(2) ON timing

While in the print, turns ON when it is in the double sided print mode or mixed with the single sided print anddouble sided print.

(3) OFF timing

Turns OFF in accord with the turn OFF of the drum motor (M2).

L. Power supply cooling fan /2 (FM15) control

(1) Purpose

To cool down the DC power source /1 (DCPS1) with exhaust.

(2) ON timing

• Turns ON a specified period of time after the power switch (SW2) turns ON.• While in the warm-up and in the print, rotates at a high speed.• While in the idle and in the low power mode, rotates at a low speed.

(3) OFF timing

• Turns OFF in accord with the turning-OFF of SW2.• While in the sleep mode, turns OFF.

M. Power supply cooling fan /1 (FM16) control

(1) Purpose

To cool down the DC power supply /1 (DCPS1) with suction.

(2) ON timing

• Turns ON a specified period of time after the power switch (SW2) turns ON.• While in the warm-up and in the print, rotates at a high speed.• While in the idle and in the low power mode, rotates at a low speed.

(3) OFF timing

• Turns OFF in accord with the turning-OFF of SW2.• While in the sleep mode, turns OFF.

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N. CPU cooling fan (FM20) control

(1) Purpose

To cool down the system control board (SCB) with suction.

(2) ON timing

• While in the print, rotates at a high speed.• While in the idle, and while in the low power mode and the normal sleep mode, changes over between the

high speed rotation and the low speed rotation according to the temperature detected by the CPU.

(3) OFF timing

While rotating at a low speed, turns OFF when the temperature detected by the CPU gets below the prescribedtemperature.

O. HDD cooling fan (FM21) control

(1) Purpose

To cool down the HD-503 with suction.

(2) ON timing

Turns ON while in the idle and the print.

(3) OFF timing

Turns OFF while in the low power mode and the sleep mode.

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26.2 Counter control

26.2.1 Composition

26.2.2 Operation

A. Paper exit counter

Item Specifications/mechanism

Total counter (CNT1) • Displays the cumulative number of prints in all print modes.• Mechanical counter driven by the electronic signal.• Counts up for each paper exit signal.

Electronic counter • Displays the cumulative number of prints on the operation panel.• Data collection *1• Counts up for each paper exit signal.

Key counter (CNT2)optional

• Counter that disables the copy operation when the specified number ofcopies is made. (Can be removed.)

• Mechanical counter driven by the electronic signal.

*1: The following data are collected.• Service total• By modes• Trouble (SC)• Fixed parts• PM• Reuse• Fax communications errors• ADF passage count• JAM• Optional parts• Warning• Coverage block data• Time series jam• Time series (SC)• High coverage data• Block jam occurrence• Block trouble (SC) occurrence

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SCB

OB1

IPB

PRCB

CNT1 CNT2 PS37LCDB

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B. Coin vendor

The following shows the specifications of the connecting connector.

*1 Output signals by paper sizes

Connector Pin No. Signal name Description Output timing Type of signal

36 1 Paper feed motor (M1) signal

Output from the start button being turned ON up to the com-pletion of paper exit

L output while in the copy opera-tion

Open collector output

2 Paper feed signal

Output each time paper is supplied

L output each time paper is sup-plied from each tray

3 Paper size signal (0)

Signal output by paper sizes *1

When the paper size is changed




7 Double sided copy selection signal

Signal output while in the double sided copy

While in the selec-tion of the double sided copy

8 CPF signal (0) Signal output by CPF modes

While in the selec-tion of the CPF mode

9 CPF signal (1)

10 P·GND Ground — —

Size Paper size signal

(3) (2) (1) (0)

A3 L L H L

B4 L L L L

A4 L H H L

A4R H L H L

B5 L H L L

B5R H L L L

Special L H L H

11 x 17 L L H H

8.5 x 14 L L L H

8.5 x 11 L H H H

8.5 x 11R H L H H

5.5 x 8.5/A5 L L H L

F4 H L L H

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26.3 Parts that operate when the power switch is turned ON

26.3.1 Parts that operate when the power cord is plugged into the power outlet.

A. Composition

B. Operation

When the dehumidification heater switch (SW3) is turned ON, when the power cord is plugged into the poweroutlet, the dehumidification heaters /1 (HTR1) and /2 (HTR2), and the dehumidification heater (HTR101) of LUare turned ON.The AC line is provided with the circuit breakers /1 (CBR1) and /2 (CBR2) which cut off the AC line by them-selves immediately when an excessive current flows due to a short circuit while plugging the power cord into thepower outlet. And, noises that enter through the power line are reduced by the noise filter (NF).

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DCPS1

T1

NF Coil/2

LU

RL2

HT

R2

HT

R1

01

HT

R1

CBR1

SW3

SW1

CBR2

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26.3.2 Parts that operate when the main power switch (SW1) is turned ON

A. Composition

B. Operation

Turning on the main power switch (SW1) supplies the AC power source to the DC power sources /1 (DCPS1)and /2 (DCPS2). In this manner, DCPS2 generates 5 VDC to supply it to the image processing board (IPB) andthe printer control board (PRCB). IPB sends this DC power source to the status management control section ofthe system control board (SCB) to stand by for the turn-on of the power switch (SW2). And, SCB sends this DCpower source to the operation board /2 (OB2) through the operation board /1 (OB1) to turn on the power sourcelamp. And also, when the network setting: set, inputting the AC power source allows DCPS1 to generate 12VDC to supply it to the IPB and HD-503 (optional).DCPS that generates 5 VDC is provide with a power save mechanism so that it consumes less power while inthe stand-by.

SW2

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DCPS1

PRCB

DCPS2 IPB

5VDC

12VDC

OB1SCB OB2

HD

-50

3

NF Coil/2

Coil/1 EU only

CBR1 SW1

CBR2

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26.3.3 Parts that operate when the power switch (SW2) is turned ON

A. Composition

B. Operation

When the power switch (SW2) is turned ON with the main power switch (SW1) ON, the DC power source /1(DCPS1) supplies the 24V DC power source system for the drive of various types of load in addition to thepower source systems that have been supplied so far. And also, it also supplies the AC power source to the fus-ing heater lamp /1 (L2), /2 (L3), and /3 (L4) when the main relay (RL1) turns on. In this manner, each of theboards are supplied with the power source to start the initial operation of the main body.

SW2

RL1

DCPS1

RL1

L2

L3

L4

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PRCB IPB

24VDC

12VDC

5VDC

SCB

NF Coil/2

CBR1 SW1

CBR2

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26. OTHERS

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Documents

SERVICE MANUAL 750/600 - Diagramas dediagramas.diagramasde.com/otros/bIZHUB 600.pdf · SERVICE MANUAL 2005.08 Ver. 1.0 750/600 Theory of Operation Main body