Bizhub PRO C500 C8150 - Service Manual

SERVICE MANUAL

8050/CF5001 C500

8150

2004. 12Ver. 3.0

SAFETY AND IMPORTANT WARNING ITEMS

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

Because of possible hazards to an inexperienced person servicing this copier as well as the risk of damage tothe copier, Konica Minolta Business Technologies, INC. (hereafter called the KMBT) strongly recommends thatall servicing be performed only by KMBT-trained service technicians.Changes may have been made to this copier 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 ServiceManual is complete and accurate.The user of this Service Manual must assume all risks of personal injury and/or damage to the copier while ser-vicing the copier for which this Service Manual is intended.Therefore, this Service Manual must be carefully read before doing service work both in the course of technicaltraining and even after that, for performing maintenance and control of the copier properly.Keep this Service Manual also for future service.

In this Service Manual, each of three expressions DANGER, WARNING, and CAUTION is definedas follows together with a symbol mark to be used in a limited meaning. When servicing the copier, 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 ANDCAUTION

DANGER :Action having a high possibility of suffering death or serious injuryWARNING:Action having a possibility of suffering death or serious injuryCAUTION :Action having a possibility of suffering a slight wound, medium trouble, and

property damage

:Precaution when using the copier. General precaution Electric hazard High temperature

:Prohibition when using the copier.General prohibition Do not touch with wet hand Do not disassemble

:Direction when using the copier.General instruction Unplug Ground/Earth


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

Konica Minolta brand copiers are renowned for their high reliability. This reliability is achieved through high-quality design

and a solid service network.

Copier 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, unau-

thorized 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 reasoning 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 beassured, leading to a risk of fire and injury.

Disabling fuse functions or bridging fuse terminals with wire, metal clips, sol-der or similar object.

Disabling relay functions (such as wedging paper between relay contacts)

Disabling safety functions (interlocks, safety circuits, etc.) Safety will not beassured, leading to a risk of fire and injury.

Making any modification to the copier unless instructed by KMBT

Using parts not specified by KMBT


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2. CHECKPOINTS WHEN PERFORMING ON-SITE SERVICEKonica Minolta brand copiers are extensively tested before shipping, to ensure that all applicable safety standards are met,

in order to protect the customer and customer engineer (hereafter called the 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.

2.1 Power Supply

Connection to Power Supply

WARNING Check that mains voltage is as specified. Plug the power cord into the dedi-

cated wall outlet with a capacity greater than the maximum power consump-tion.

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 loadmust not exceed the rating of the wall outlet.

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

Connect power plug directly into wall outlet having same configuration as theplug.

Use of an adapter leads to the product connecting to inadequate powersupply (voltage, current capacity, grounding), and may result in fire or elec-tric shock.If proper wall outlet is not available, advice the customer to contact quali-fied electrician for the installation.

Make sure the power cord is plugged in the wall outlet securely.Contact problems may lead to increased resistance, overheating, and therisk of fire.

Ground Lead

WARNING Check whether the copier is grounded properly.

If current leakage occurs in an ungrounded copier, you may suffer electricshock while operating the copier. Connect the ground lead to one of thefollowing points:a. Ground terminal of wall outletb. Ground terminal for which Class D work has been done

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Pay attention to the point to which the ground lead is connected.Connecting the ground lead to an improper point such as the points listedbelow results in a risk of explosion and electric shock:a. Gas pipe (A risk of explosion or fire exists.)b. Lightning rod (A risk of electric shock or fire exists.)c. Telephone line ground (A risk of electric shock or fire exists in the caseof lightning.)d. Water pipe or faucet (It may include a plastic portion.)

Power Plug and Cord

WARNING For the products that use the power cord set (inlet type), be sure to follow the

directions given below.When securing measure is provided, secure the cord with the fixture prop-erly.a. Be sure to check to see if the power cord is securely inserted into the

main body side inlet.b. When the fixing of the cord is indicated in the installation instructions,

be sure to fix it securely by using the fixing materials provided in thesame package.

c. When the power cord is damaged with its sheath broken, be sure toreplace it with the specified power cord set.

When the power cord is not securely inserted, an abnormal heat may gen-erates due to a poor contact of the cord, thus resulting in a fire.

Check whether the power cord is not stepped on or pinched by a table andso on.

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

Check whether the power cord is damaged. Check whether the sheath isdamaged.

If the power plug, cord, or sheath is damaged, replace with a new powercord (with plugs on both ends) specified by KMBT. Using the damagedpower cord may result in fire or electric shock.

Do not bundle or tie the power cord. Overheating may occur there, leading to a risk of fire.

Ground Lead

WARNING


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2.2. Installation Requirements

Check whether dust is collected around the power plug and wall outlet.Using the power plug and wall outlet without removing dust may result infire.

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.

Wiring

WARNING

Never use multi-plug adapters to plug multiple power cords in the same out-let.

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 longextension cord may result in fire.Do not use an extension cable reel with the cable taken up. Fire mayresult.

Prohibited Installation Place

WARNING Do not place the copier near flammable materials such as curtains or volatile

materials that may catch fire.A risk of fire exists.

Do not place the copier in a place exposed to water such as rain water.A risk of fire and electric shock exists.

Power Plug and Cord

WARNING


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When not using product for a long time

WARNING

When the copier 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 copier generates ozone gas during operation, but it is not sufficient to be

harmful to the human body.If a bad smell of ozone is present in the following cases, ventilate theroom.

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

Fixing

CAUTION Be sure to lock the caster stoppers.

In the case of an earthquake and so on, the copier may slide, leading to ainjury.

Inspection before Servicing

CAUTION Before conducting an inspection, read all relevant documentation (service

manual, technical notices, etc.) and proceed with the inspection following theprescribed procedure in safety clothes, using only the prescribed tools. Donot make any adjustment not described in the documentation.

If the prescribed procedure or tool is not used, the copier may break and arisk of injury or fire exists.

Before conducting an inspection, be sure to disconnect the power plugs fromthe copier and options.

When the power plug is inserted in the wall outlet, some units are still pow-ered even if the POWER switch is turned OFF. A risk of electric shockexists.


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The area around the fixing unit is hot.You may get burnt.

Work Performed with the Copier Powered

WARNING Take every care when making adjustments or performing an operation check

with the copier powered.If you make adjustments or perform an operation check with the externalcover detached, you may touch live or high-voltage parts or you may becaught 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 electric shock exists.

Safety Checkpoints

WARNING Check the exterior and frame for edges, burrs, and other damages.

The user or CE may be injured. Be careful not to drop metal chips such as a clip, staple and/or a screw into

the inside of the product or its gaps.A short circuit may occurs inside the product, thus resulting in an electricshock and/or a 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 electrical parts and elec-trode units such as a charging corona unit.

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

Check high-voltage cables and sheaths for any damage.Current can leak, leading to a risk of electric shock or fire.

Check electrode units such as a charging corona unit for deterioration andsign of leakage.

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

Inspection before Servicing

CAUTION


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Before disassembling or adjusting the write unit incorporating a laser, makesure 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 writeunit shifted from the specified mounting position.

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

When replacing a lithium battery, replace it with a new lithium battery speci-fied in the Parts Guide Manual. Dispose of the used lithium battery using themethod specified by local authority.

Improper replacement can cause explosion.

After replacing a part to which AC voltage is applied (e.g., optical lamp andfixing lamp), be sure to check the installation state.

A risk of fire exists.

Check the interlock switch and actuator for loosening and check whether theinterlock functions properly.

If the interlock does not function, you may receive an electric shock or beinjured when you insert your hand in the copier (e.g., for clearing paperjam).

Make sure the wiring cannot come into contact with sharp edges, burrs, orother pointed parts.

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

Make sure that all screws, components, wiring, connectors, etc. that wereremoved for safety check and maintenance have been reinstalled in the orig-inal location. (Pay special attention to forgotten connectors, pinched cables,forgotten screws, etc.)

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

Safety Checkpoints

WARNING


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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 witheyes, 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.

Never throw the used cartridge and toner into fire.You may be burned due to dust explosion.

HANDLING OF SERVICE MATERIALS

DANGER : HANDLING OF SERVICE MATERIALS When solution is used for cleaning, be sure to unplug the power cord from

the power outlet.Drum cleaner (isopropyl alcohol) and roller cleaner (acetone-based) arehighly flammable and must be handled with care. A risk of fire exists.

Do not replace the cover or turn the copier ON before any solvent remnantson the cleaned parts have fully evaporated.


Use only a small amount of cleaner at a time and take care not to spill anyliquid. 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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The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration implementedregulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products mar-keted 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 RadiationControl for Health and Safety Act of 1968. Since radiation emitted inside this copier is completely confined withinprotective housings and external covers, the laser beam cannot escape during any phase of normal user opera-tion.

SAFETY INFORMATION

IMPORTANT INFORMATION


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This machine is provided with the following safety circuits to prevent machine faults from resulting in serious accidents.

Overall protection circuit Fixing upper lamp /1 (L2), Fixing upper lamp /2 (L3), Fixing lower lamp (L4) overheating prevention circuitThese safety circuits are described below to provide the service engineer with a renewed awareness of them in order to pre-

vent servicing errors that may impair their functions.

1. Overall protection circuit

1.1 Protection by circuit breaker /1 (CBR1) and circuit breaker /2 (CBR2)CBR1 and CBR2 interrupt the AC line instantaneously when an excessive current flows due to a short in the AC

line.

CAUTION:The CBR1 and CBR2 functions must not be deactivated under any circumstances.

SAFETY CIRCUITS

NF

CBR1

CBR2

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2. Fixing upper lamp /1 (L2), Fixing upper lamp /2 (L3), Fixing lower lamp (L4) overheatingprevention circuit

2.1 Protection by softwareThe output voltage from fixing temperature sensor /1 (TH1) and fixing temperature sensor /2 (TH2) is read by the

CPU. If this voltage is abnormal, L2, L3, and L4 are turned OFF by opening main relay (RL1).

CAUTION: The clearance between the fixing upper roller and TH1 and the clearance between the fixing

lower roller and TH2 must not be changed. When replacing them, make sure to comply with the specified clearances.

The RL1 function must not be deactivated under any circumstances.

2.2 Protection by the hardware circuitThe output voltages from fixing temperature sensor /1 (TH1), fixing temperature sensor /2 (TH2), fixing temperature

sensor /3 (TH3), and fixing temperature sensor /4 (TH4) are compared with the abnormality judgment reference

value in the comparator circuit. If the output voltage from TH1, TH2, TH3, or TH4 exceeds the reference value, L2,

L3, and L4 are turned OFF by opening RL1.

CAUTION: The clearance between the fixing upper roller and TH1 and the clearance between the fixing

lower roller and TH2 must not be changed. When replacing them, make sure to comply with the specified clearances.

Periodically check the contact between the fixing upper roller and TH3 and the contact between the fixing lower roller and TH4, and replace them if any abnormality is detected.

The RL1 function must not be deactivated under any circumstances.

2.3 Protection by thermostat /1 (TS1) and thermostat /2 (TS2)When the temperature of the fixing upper roller exceeds the specified value, TS1 is turned OFF, thus interrupting the

power to L2 and L3 directly. When the temperature of the fixing lower roller exceeds the specified value, TS2 is

turned OFF, thus interrupting the power to L4 directly.

CAUTION: Do not use any other electrical conductor in place of TS1 and TS2.

Control

section

AC driver

section

TS1

PRCB ACDB

TS2

L2

L3

L4

RL1RL1

TH1

TH3

TH2

TH4

FHCB

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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.

CAUTION

INDICATION OF WARNING ON THE MACHINE

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-self away from.Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot be read, contact our Service Office.

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CAUTION


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CAUTION


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CAUTION


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CAUTION


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Unplug the machine before removing platen glass.

Debrancher le copieur avant de retirer la vitre d'exposition.

Desenchufe la maquina antes de quitar el vidrio.

Desconecte a unidade da tomada antes de remover o vidro de exposicao.

PS

~


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CAUTION


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KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 CONTENTS

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2

CONTENTSSAFETY AND IMPORTANT WARNING ITEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10

IMPORTANT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10

SAFETY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11

INDICATION OF WARNING ON THE MACHINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-13

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viiRevision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viiComposition of the service manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viiiNotation of the service manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ix

Measures to take in case of an accident . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiList of major differences between the old type and the new type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

I OUTLINE1. OUTLINE OF SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12. 8050/CF5001/C500/8150 PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23. CENTER CROSS SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64. PAPER PATH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-75. DRIVE SYSTEM DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

5.1 Drum drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-95.2 Transfer belt conveyance/pressure drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-105.3 Developing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-115.4 Toner supply drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-125.5 Toner collection drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-135.6 Fixing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-145.7 Paper feed drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

5.7.1 Paper feed tray /1 to /3 drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-155.7.2 Vertical conveyance drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

5.8 ADU drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-185.8.1 Bypass tray drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-185.8.2 Registration drive/loop drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-195.8.3 ADU conveyance drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-205.8.4 Reverse paper exit drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

5.9 Main body paper exit drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-225.10 Scanner drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

6. IMAGE CREATION PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-246.1 Image creation flow and function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-246.2 Charging process (Step 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

CONTENTS KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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6.3 Laser exposure process (Step 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-256.4 Developing process (Step 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-266.5 1st transfer process (Step 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-276.6 2nd transfer process (Step 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-286.7 Separation process (Step 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-286.8 Drum cleaning (Sub step 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-296.9 Pre-charging exposure (Sub step 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-296.10 Transfer belt cleaning (Sub step 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-306.11 2nd transfer roller /L cleaning (Sub step 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-306.12 Toner collection (Sub step 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-316.13 Process speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

II UNIT EXPLANATION1. SCANNER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

1.2.1 Home position search in the exposure unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21.2.2 Shading correction reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31.2.3 Original reading mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41.2.4 Original reading control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51.2.5 APS control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81.2.6 AE control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-101.2.7 Image processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2. WRITE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

2.2.1 Image writing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-142.2.2 Color registration correction control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

3. DRUM UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-213.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-213.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

3.2.1 Image formation timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-254. DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

4.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-264.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

4.2.1 Flow of developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-284.2.2 Developing control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-284.2.3 Toner supply control to the developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-284.2.4 Developing bias control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-294.2.5 Durability of the developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

5. TRANSFER BELT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-305.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-305.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

5.2.1 Transfer belt pressure/release mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-325.2.2 Image correction unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-335.2.3 1st transfer control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-345.2.4 2nd transfer control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34


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5.2.5 Control for the prevention of the flipping of the belt cleaning blade . . . . . . . . . . . . . . . . . . 2-345.2.6 Control against belt filming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

6. TONER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-356.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-356.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

6.2.1 Toner supply control to the toner hopper section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-366.2.2 Toner supply control to the developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-366.2.3 Copy/print operation stop control due to no toner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

7. TONER COLLECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-387.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-387.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

7.2.1 Toner collection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-397.2.2 Waste toner full detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

8. PAPER FEED TRAY /1 TO /3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-408.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-408.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42

8.2.1 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-428.2.2 Up/down plate control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-438.2.3 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-448.2.4 Paper size detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45

9. BYPASS FEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-469.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-469.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

9.2.1 Tray up drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-479.2.2 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-479.2.3 Paper size detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

10.VERTICAL CONVEYANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4810.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4810.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

10.2.1 Vertical conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4811. REGISTRATION/ADU/REVERSE/PAPER EXIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

11.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4911.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53

11.2.1 Switching control of the paper exit/ADU conveyance path. . . . . . . . . . . . . . . . . . . . . . . . . 2-5311.2.2 Reverse/exit control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5711.2.3 ADU conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5811.2.4 Paper reverse control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5911.2.5 ADU pre-registration control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6011.2.6 Registration control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6211.2.7 2nd transfer control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6311.2.8 Paper exit full detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63

12.FIXING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6412.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6412.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66

12.2.1 Fixing drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6612.2.2 Pressure/release control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6712.2.3 Web control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68


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12.2.4 Temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6813. INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69

13.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6914. IMAGE STABILIZATION CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70

14.1 Toner density control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7014.2 Dmax control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7014.3 Charging potential control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71

14.3.1 Correction of the reference value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7114.3.2 Low humidity environment correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71

14.4 Dot diameter adjustment control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7214.5 Gamma correction control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73

15.OTHER CONTROLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7415.1 Parts to which power is supplied even when the main power switch is turned off . . . . . . . . . . . . 2-7415.2 Parts that operate only when the power switch is turned on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75

15.2.1 Parts that operate when the main power switch is turned on . . . . . . . . . . . . . . . . . . . . . . . 2-7515.2.2 Parts that operate when the sub power switch is turned on . . . . . . . . . . . . . . . . . . . . . . . . 2-75

15.3 Fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7615.3.1 Fan composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76

15.4 Operation board control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7715.4.1 Operation board composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-77

15.5 Counter control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7815.5.1 Counter composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7815.5.2 Counter operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

15.6 ACS control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8015.6.1 Switching between the color mode and the black and white mode . . . . . . . . . . . . . . . . . . 2-8015.6.2 Copy count when using ACS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80

III DISASSEMBLY/ASSEMBLY1. EXTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1.1 Replacing the dust filter /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11.2 Replacing the dust filter /1 and the ozone filter /1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31.3 Replacing the toner collection box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51.4 Angle adjustment of the operation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71.5 Removing and reinstalling the main board unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

2. SCANNER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-122.1 Screws that must not be removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-122.2 Removing and reinstalling the platen glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-132.3 Removing and reinstalling the CCD unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-142.4 Removing and reinstalling the exposure unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-162.5 Removing and reinstalling the exposure lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-192.6 Removing the scanner wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-202.7 Reinstalling the scanner wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

3. WRITING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-253.1 Screw that must not be removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-253.2 Removing and reinstalling the write unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

4. PROCESS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-294.1 Flow of the disassembly of the process unit section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29


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4.2 Cleaning the charging corona unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-304.3 Cleaning/replacing, removing and reinstalling the charging wire assy

/the charging control plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-324.4 Pulling out the process unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-334.5 Removing and reinstalling the transfer belt unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-354.6 Replacing the belt cleaning roller unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-384.7 Replacing the belt cleaning blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-394.8 Replacing the toner collection sheet /1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-404.9 Replacing the belt separation claw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-414.10 Replacing the transfer belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-424.11 Replacing the 1st transfer roller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-454.12 Replacing the 2nd transfer roller /U. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-464.13 Replacing the drum cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-474.14 Removing and reinstalling the drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-484.15 Replacing the developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-504.16 Replacing the developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-524.17 Replacing the belt separation claw solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-544.18 Removing and reinstalling the process unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-554.19 Removing and reinstalling the image correction unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56

5. TONER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-575.1 Opening and closing the toner supply section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-575.2 Replacing the charging dust filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58

6. TONER COLLECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-596.1 Cleaning of the belt collection pipe/vertical/horizontal/conveyance pipe. . . . . . . . . . . . . . . . . . . 3-59

7. PAPER FEED TRAYS /1 to /3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-737.1 Removing and reinstalling the paper feed unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-737.2 Removing and reinstalling the paper feed trays /1 to /3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-757.3 Replacing the paper feed roller and the feed rubber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-767.4 Replacing the double feed prevention rubber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-787.5 Replacing the paper feed clutch and the pre-registration clutch . . . . . . . . . . . . . . . . . . . . . . . . . 3-797.6 Removing and reinstalling the tray up/down wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80

8. BYPASS TRAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-848.1 Replacing the paper feed roller and the feed roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-848.2 Replacing the double feed prevention roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-868.3 Replacing the paper feed clutch /BP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-87

9. VERTICAL CONVEYANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-899.1 Removing and reinstalling the vertical conveyance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-899.2 Replacing the intermediate conveyance clutch /1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-92

10.FIXING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9310.1 Screws that must not be removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9310.2 Removing and reinstalling the fixing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9410.3 Replacing the fixing upper heater lamps /1 and /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9510.4 Replacing the fixing lower heater lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9710.5 Replacing the fixing roller /U, ball bearing /U and the heat insulating sleeve /U . . . . . . . . . . . . 3-10010.6 Replacing the fixing roller /L, ball bearing /L and the heat insulating sleeve /L . . . . . . . . . . . . . 3-10210.7 Replacing the fixing temperature sensor /3, and removing and

reinstalling the fixing temperature sensor /1 and the thermostat /1. . . . . . . . . . . . . . . . . . . . . . 3-104


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10.8 Replacing the fixing temperature sensor /4, and removing and reinstalling the fixing temperature sensor /2 and the thermostat /L . . . . . . . . . . . . . . . . . . . . . . 3-109

10.9 Replacing the fixing drive gear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11410.10Replacing the fixing cleaning unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11610.11Replacing the fixing torque limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11810.12Replacing the paper exit roller /Up (for the new type only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-120

11. REGISTRATION/ADU/REVERSE/PAPER EXIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12211.1 Removing and reinstalling the ADU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12211.2 Replacing the registration cleaning sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12411.3 Replacing the separation discharging plate unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12511.4 Replacing the transfer ground plate unit and the 2nd transfer roller /L . . . . . . . . . . . . . . . . . . . 3-12611.5 Replacing the registration roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12711.6 Replacing the intermediate conveyance clutches /2 and /3. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13311.7 Replacing the ADU conveyance clutches /1 and /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13411.8 Replacing the ADU pre-registration clutch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13511.9 Replacing the decurler roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13611.10Replacing the paper exit guide roller /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13811.11 Replacing the paper exit roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14311.12Replacing the paper presser roller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14611.13Replacing the lock levers 1/ and /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-147

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 Introduction

vii

Introduction

Revision history

After publication of this service manual, the parts and mechanism may be subject to change for improvementof 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 be issuedwith 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 corresponding page. A number within represents the number of times the revision has been made.

Note:Revision 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.

1

1

2004/12 3.0 Change of design and correction of errors in writing2004/04 2.0 Change of design and correction of errors in writing2003/08 1.0 Issue of the first edition

DateService

manual Ver.Revision mark Descriptions of revision

Introduction KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

viii

Composition of the service manual

This service manual consists of the following sections and chapters:

I OUTLINE: System configuration, product specifications, unit configuration, paper

path, drive system, and image creation process *II UNIT EXPLANATION: Configuration of each unit, explanation of the operating system, and

explanation of the control systemIII DISASSEMBLY/ASSEMBLY: Removal/reinstallation method of periodically replaced parts and

major parts. As information for the CE to have a better understanding of the product, this part outlines the object of eachfunctions, its role, the relationship between the electrical system and the mechanical system, and the timingof the operations of each part, and then explains the removal and reinstallation procedure of the periodicallyreplaced parts and the major parts.

The contents of * are described only in the service manual of the main body.

I ADJUSTMENT: General description of items to be adjusted, 25 mode, 36 mode, 47

mode, and other adjustments (mechanical adjustments)II SERVICE TOOL: Various types of ISW *, and mail remote notification systemIII SERVICE: Service schedule, copy materials, service materials, and CE tools *IV JAM CODE LIST: List of jam codes, causes, operations when a jam occurs, and removal

methodsV ERROR CODE LIST: List of error codes, causes, operations when a warning is issued, and

expected defective partsVI DIAGRAMS: Parts layout drawing, connector layout drawing, timing chart, and

overall wiring diagramAs information that the CE requires at the job site (customer's premise), this part explains the service sched-ule and its contents, the object and role of each adjustment, error codes and supplementary information.

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 Introduction

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Notation of the service manual

1. Product nameIn this manual, each of the products is described as follows:(1) IC board: Standard printer(2) KonicaMinolta 8050/CF5001/bizhub PROC500/8150:

Main body or this machine(3) Microsoft Windows 95: Windows 95

Microsoft Windows 98: Windows 98Microsoft Windows Me: Windows MeMicrosoft Windows NT 4.0: Windows NT 4.0 or Windows NTMicrosoft Windows 2000: Windows 2000Microsoft Windows XP: Windows XPWhen the description is made in combination of the OS's mentioned above:

Windows 95/98/MeWindows NT 4.0/2000Windows NT/2000/XPWindows 95/98/Me/ NT/2000/XP

2. Brand nameThe company names and product names mentioned in this manual are the brand name or the registeredtrademark of each company.

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

Classification Load symbol Ex. of signal name Description

Sensor PS

IN

Sensor detection signalPSDoor PS1SIG102 PS

Solenoid SD24V Power to drive the solenoidDRV

Drive signalSOL

Clutch CL24V Power to drive the clutchDRV

Drive signalSOL

Motor M

24V Power to drive the motorCONT Drive signalDRV1

Drive signals of two kindsDRV2D1D2

Introduction KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

x

Motor M

_U

Drive signals (control signals) of three kinds_V_WDRV1DRV2DRV3D1

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

D2D3D4DRV ADRV ADRV BDRV BA/AB/BABBBCLK, PLL PLL control signalLCK, Lock, LD PLL lock signalFR Forward/reverse rotation signalEM, Lock, LCK, LD Motor lock abnormalityBLK Drive brake signalP/S Power/stopS/S Operating load start/stop signalSSCW/CCW, F/R Rotational direction switching signalENB Effective signalTEMP_ER Motor temperature abnormality detection signal

Others TH1.S, ANG Analog signal

Ground SG, S.GND, S_GND Signal groundPG, P.GND Power ground

Serialcommunication

DCD Data carrier detectionSIN Serial inputSOUT Serial outputDTR Data terminal operation availableGND Signal ground (earth)DSR, DSET Data set readyRTS Transmission request signalCTS Consent transmission signalRI Ring indicatorTXD Serial transmission dataRXD Serial reception data

Classification Load symbol Ex. of signal name Description

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 Measures to take in case of an accident

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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 emer-gency 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 evaluation must be car-ried 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 Acci-dent Report/Follow-up Procedures."

List of major differences KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

xii2

List of major differences between the old type and the new type

*1 For the old type, the paper exit roller is replaced only when it is provided with a kit against uneven wax.

The discrimination of the old type from the new type is made according to the list of product numbers asshown below. The judgement is made based on the upper 4-digit alphanumeric characters of the serial num-ber.And also in this manual the model name is not given, but only "Old type" and "New type" given.

Classification Old type New typeMaterial Developer (each

color)Used exclusively by the old type Used exclusively by the new type

Toner (each color) Used exclusively by the old type Used exclusively by the new typeDrum Common to Old type/New type

Registration/ADU/Reverse/Paper exit

Registration roller Torque limiter not provided Torque limiter providedADU reverse roller Rubber roller

(Driven roller is of resin)Spike roller (metal)

(Driven roller is of rubber)Reverse/exit roller /2 Rubber roller

(Driven roller is of resin)Spike roller (metal)

(Driven roller is of rubber)Paper exit roller Normal Surface fluorine-treatedPeriodic replace-ment cycle of paper exit roller

Every 1,000,000 copies/prints *1

Every 200,000 copies/prints

Exit paper upper face cooling fan

Not provided Provided

Secondary transfer

Secondary transfer pressure cam

WhiteCam distance: Small

Spring pressure: Large

BlackCam distance: Large

Spring pressure: SmallControl Printer control

boardUsed exclusively by the old type Used exclusively by the new type

Printer control pro-gram

Used exclusively by the old type Used exclusively by the new type

Image control pro-gram

Used exclusively by the old type Used exclusively by the new type

Fixing Paper exit roller /Up Resin roller Ceramic coated rollerPaper exit roller /Up replacement cycle

Every 200,000 copies/prints

Model nameProduct number

Old type New type8050 65AE, 65AJ, 65AF, 65AN, 65AK, 65AT, 65AP 65LT, 65LUCF5001 65BE, 65BF 65LQC500 65LE, 65LF, 65LJ, 65LN, 65LG8150 65LK, 65LP

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 OUTLINE OF SYSTEM

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I OUTLINE

1. OUTLINE OF SYSTEM

* [16] and [17] are packaged in the same kit of [15].

[1][2]

Main bodyLCT (LT-211/C-208)

[10] Finisher (New type: FS-513, Old type: FS-115/FN-120)

[3][4]

Printer controller (IP-901)Hard disk (HD-106)

[11] Puncher (New type: PK-507/508, Old type: PK-120/PK-5)

[5] Expansion memory (MU-412: 256MB x 4) [12] Cover sheet feeder (PI-110)[6] Key counter [13] RADF (DF-319/AFR-20)[7] TU-109 Connection kit (TU-109 A KIT) [14] Platen cover (CV-131)[8] Trimmer (TU-109/TMG-3) [15] Built-in printer controller (IP-921)[9] Finisher

(New type: FS-606, Old type: FS-215/FN-9)[16]*[17]*

Hard disk (for IP-921)DC power for printer controller (for IP-921)

8050ma1001

[1]

[2] [3]

[16]*

[17]*

[4][15]

[5]

[6]

[7]

[8] [9]

[10]

[11]

[11]

[12]

[12]

[13][14]

PRODUCT SPECIFICATIONS KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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2. 8050/CF5001/C500/8150 PRODUCT SPECIFICATIONSA. Type

Type: Console type (floor-mounted type)Copying method: Tandem intermediate transfer type electrostatic methodOriginal table: FixedOriginal alignment: Rear left side as referencePhotosensitive material: OPCSensitizing method: Laser writingPaper feed trays: 3 trays method (500 sheets x 3, 80 to 90 g/m2) (400 sheets x 3, 105 g/m2)

Multisheet bypass tray (250 sheets, 80 to 90 g/m2) (200 sheets, 105 g/m2)LT-211 (2500 sheets, 80 to 90 g/m2) *1

*1 Optional

B. FunctionsOriginal to be copied: Sheet, book, solid objectMaximum original size: A3, or 11 x 17 (303 x 438 mm for non standard)Copy size (for metric area): Tray 1 to 3: A3, B4, A4, A4R, B5, B5R, A5R, 8.5 x 11, 8.5 x

14, 11 x 17, 12 x 18, 13 x 19, wide paper *1Bypass feed: A3, B4, A4, A4R, B5, B5R, A5R, 8.5 x 11, 8.5 x

11R, 11 x 17, 12 x 18, 13 x 19, wide paper *1

ADU: A3, B4, A4, A4R, B5, B5R, A5R, 8.5 x 11, 8.5 x11R, 11 x 17, 12 x 18, 13 x 19, wide paper *1

Copy size (for inch area): Tray 1 to 3: 5.5 x 8.5R, 8.5 x 11, 8.5 x 11R, 8.5 x 14, 11 x 17, 12 x 18, 13 x 19, A3, B4, A4, B5, B5R,wide paper *1

Bypass feed: 5.5 x 8.5R, 8.5 x 11, 8.5 x 11R, 8.5 x 14, 11 x 17, 12 x 18, 13 x 19, A3, B4, A4, B5, B5R,wide paper *1

ADU: 5.5 x 8.5R, 8.5 x 11, 8.5 x 11R, 8.5 x 14, 11 x 17, 12 x 18, 13 x 19, A3, B4, A4, B5, B5R,wide paper *1

*1 Wide paper is available up to 330 x 487 mm.

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 PRODUCT SPECIFICATIONS

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Magnification: Fixed magnification (for metric area):x 1.000, x 2.000, x 1.414, x 1.224, x 1.154, x 0.866, x 0.816, x 0.707, x 0.500

Fixed magnification (for inch area):x 1.000, x 2.000, x 1.545, x 1.294, x 1.214, x 0.786, x 0.773, x 0.647, x 0.500

Special ratio magnification:3 types

Zoom magnification: x 0.250 to x 4.000 (graduated at increment of0.1%)

Vertical magnification: x 0.250 to x 4.000 (graduated at increment of0.1%)

Horizontal magnification: x 0.250 to x 4.000 (graduated at increment of0.1%)

Warm-up time (for metric area): Less than 420 sec. (at room temperature of 20C with rated voltage)Warm-up time (for inch area): Less than 390 sec. (at room temperature of 20C with rated voltage)First copy time: Full color: Less than 7.6 sec. (platen mode, life size,

manual density, paper feed tray /1 to /3, plainpaper, without gloss, face up paper exit, A4 or8.5 x 11)

Monochrome: Less than 7.6 sec. (platen mode, life size,manual density, paper feed tray /1 to /3, plainpaper, without gloss, face up paper exit, A4 or8.5 x 11)

Black-and-white: Less than 6.0 sec. (platen mode, life size,manual density, paper feed tray /1 to /3, plainpaper, without gloss, face up paper exit, A4 or8.5 x 11)

Continuous copy speed: Full color: 51 sheets/min. (A4, memory copy)50 sheets/min. (8.5 x 11, memory copy)

Monochrome: 51 sheets/min. (A4, memory copy)50 sheets/min. (8.5 x 11, memory copy)

Black-and-white: 51 sheets/min. (A4, memory copy)50 sheets/min. (8.5 x 11, memory copy)

Continuous copy count: 9999 sheets, max. or 9999 copiesPaper exit tray loading capacity: 150 trays (A4), max.Copy density selection: AE, manual (9 steps)Resolution: Scan: 600 dpi x 600 dpi

Copy: 600 dpi x 600 dpi

PRODUCT SPECIFICATIONS KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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E-RDH memory *2 Standard 128 MB for each color (Y, M, C, K);Max. 384 MB for each color (Y, M, C, K)

Interface: Serial port (USB Type B), Serial port (RS-232C), RJ45 Ethernet connec-tor, parallel port (based on IEEE 1284), Video interface for IP-901

No. of originals in memory: Full color: Priority in high resolution: 18 faces or morePriority in smooth tone: 18 faces or morePriority in high compression: 38 faces or moreConditions: Original: KC #101/A3 (color)

Density: Manual 5Mode: Character/picture, printedoriginal, life sizeMemory capacity: Standard 128MB only loaded

Black-and-white/monochrome:Priority in high resolution: 101 faces or morePriority in smooth tone: 101 faces or morePriority in high compression: 318 faces or moreConditions: Original: Image electronic insti-

tute FAX #4 chart/A4Density: Manual 5Mode: Character/picture, printedoriginal, life sizeMemory capacity: Standard 128MB only loadedJob: Job in the mode in which jobmemory is not used.

*2 Standard 128MB memory is packaged on the board. So, it cannot be changed for a new one.Four slots are provided for expansion, and it is possible to install MU-412 (set of 4 256MB).

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 PRODUCT SPECIFICATIONS

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C. Copy paper

Standard specified paper: For full color: KonicaMinolta Color Paper 81.4 g/m2

Hammermill Tidal 75 g/m2

For black-and-white: KonicaMinolta J Paper 64 g/m2

Hammermill Laser Color Copy Photo White/Brightness 96 105 g/m2

Ordinary paper: High quality paper, coated paper and recycled paper of 64 g/m2 to 105 g/m2

Special paper *1 Label paper, High quality paper, coated paper and recycled paper of 106g/m2 to 256 g/m2

*1 Label paper should be fed one at a time by the bypass feed method.106 g/m2 to 256 g/m2 high-quality paper should be fed one sheet at a time with bypass feed method.And it should also be fed from the LT-211 (optional). (For coated paper, sheets of 120 g/m2 or more arerecommended.)For special paper other than 106 g/m2 to 256 g/m2 high-quality paper, coated paper and recycledpaper, double sided copy is not allowed.

D. Machine data

Power source (for metric area): 230 VAC -14% to 10.6% 50 HzPower source (for inch area): 208 ~ 240 VAC 10% 60 HzPower consumption (for metric area): 3450 W max. (Full option)Power consumption (for inch area): 3600 W max. (Full option)Weight: Approx. 313kgDimensions: 786 mm (W) x 889 mm (D) x 1056 mm (H) with platen cover pro-

vided

E. Maintenance and life

Maintenance: Once every 100,000 copiesMachine service life: 5,000,000 copies or 5 years (whichever earlier)

F. Consumables

Developer: Exclusively for the new type, exclusively for the old typeToner: Exclusively for the new type, exclusively for the old typeDrum: Common to the new type and the old type (60)

G. Operating environment

Temperature: 10C to 30CHumidity: 10% RH to 80% RH

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

CENTER CROSS SECTION KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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3. CENTER CROSS SECTION

[1] Process unit [12] Paper feed tray /3[2] Developing unit /Y [13] Paper feed tray /2[3] Developing unit /M [14] Paper feed tray /1[4] Write unit /Y [15] ADU[5] Write unit /M [16] Reverse section[6] Write unit /C [17] Paper exit tray[7] Developing unit /C [18] Paper exit section[8] Developing unit /K [19] Transfer belt unit[9] Write unit /K [20] Image correction unit[10] Bypass tray [21] Scanner section[11] Drum [22] CCD unit

[2][1][22]

[3]

[4]

[5]

[6]

[9]

[7]

[8]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

8050ma1002

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 PAPER PATH

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4. PAPER PATHFront side

8050ma1029

PAPER PATH KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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Back side

8050ma1030

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 DRIVE SYSTEM DIAGRAM

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5. DRIVE SYSTEM DIAGRAM5.1 Drum drive

[1] Drum motor /Y, /M, /C, /K (M14, M15, M16, M17) [2] Drum

[1]

[2]

8050ma1003

DRIVE SYSTEM DIAGRAM KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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5.2 Transfer belt conveyance/pressure drive

[1] 1st transfer roller /Y [9] Belt drive roller[2] Drum [10] While in stand-by (Total release)[3][4]

1st transfer roller /M1st transfer roller /C

[11] Black-and-white mode (Pressure on 1st transfer roller /K only)

[5] 1st transfer roller /K [12] Full color mode (Total pressure)[6] 1st transfer pressure/release motor (M19) [13] 1st transfer roller /K pressure release arm[7] Transfer belt [14] Drive coupling[8] Transfer belt motor (M18) [15] 1st transfer roller /K pressure release cam

[16] 1st transfer roller /Y /M /C pressure release cam

8050ma1004

[5]

[2]

[1]

[4]

[3]

[9]

[7]

[6]

[8]

[13]

[15]

[14]

[16]

[12] [11] [10]

A


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5.3 Developing drive

[1] Toner collection screw [5] Toner conveyance screw[2] Toner agitator screw [6] Developing coupling /1[3] Developing coupling /2 [7] Developing sleeve[4] Developing motor /Y, /M, /C, /K

(M20, M21, M22, M23)

8050ma1005

[1]

[7]

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


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5.4 Toner supply drive

[1] Toner supply gear /A (Same shaft as C) [8] Toner supply motor /C (M51)[2] Toner bottle clutch /Y (MC14) [9] Toner bottle motor (M53)[3] Toner bottle clutch /M (MC15) [10] Toner supply motor /M (M50)[4] Toner bottle clutch /C (MC16) [11] Toner supply motor /Y (M49)[5] Toner supply gear /A (Same shaft as D) [12] Toner bottle drive gear[6] Toner bottle clutch /K (MC17) [13] Toner conveyance screw[7] Toner supply motor /K (M52) [14] Toner supply screw

[12]

C

[13]

D

A

[2]

[1]

[11]

[8]

[7]

[14]

[3]

[4]

[5]

[6]

8050ma1006e

B

[10]

[9]


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5.5 Toner collection drive

[1] Drum waste toner receiving port [5] Vertical conveyance pipe[2] Horizontal conveyance screw [6] Belt collection screw[3] Horizontal conveyance pipe [7] Transfer belt motor (M18)[4] Paper feed motor (M41) [8] Belt collection drive cam

[7]

[8]

[6]

[5]

[2]

[1]

[3]

[4]

8050ma1007

A


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5.6 Fixing drive

[1] Web motor (M54) [5] Fixing roller /L[2] Fixing roller /U [6] Fixing motor (M29)[3] One-way clutch [7] Fixing paper exit roller[4] Pressure/release cam

FRONT

8050ma1008

[2]

[1]

[3][4]

[5]

[6]

[7]

[1]


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5.7 Paper feed drive

5.7.1 Paper feed tray /1 to /3 drive

[1] Pre-registration roller /3 [8] Paper feed roller /3[2] Pre-registration clutch /3 (MC12) [9] Double feed prevention roller /2[3] Drive coupling /3 [10] Tray up drive motor /3 (M38)[4] Paper feed motor (M41) [11] Paper feed roller /2[5] Double feed prevention roller /3 [12] Tray up drive motor /2 (M39)[6] Feed roller /3 [13] Double feed prevention roller /1[7] Paper feed clutch /3 (MC11) [14] Paper feed tray

8050ma1009

[19] [18] [27] [21] [20]

[22][23] [24]

[25][26]

[1][3][2]

[17]

[16][15]

[4][10][9][11] [8]

[6][7] [5][12][13][14]


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[15] Up/down wire [22] Feed roller /2[16] Tray up drive motor /1 (M40) [23] Paper feed clutch /2 (MC9)[17] Paper feed roller /1 [24] Drive coupling /2[18] Feed roller /1 [25] Pre-registration roller /2[19] Paper feed clutch /1 (MC7) [26] Pre-registration clutch /2 (MC10)[20] Pre-registration roller /1 [27] Drive coupling /1[21] Pre-registration clutch /1 (MC8)


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5.7.2 Vertical conveyance drive

[1] Intermediate conveyance clutch /1 (MC13) [3] Drive coupling[2] Paper feed motor (M41) [4] Intermediate conveyance roller /1

[2]

[3]

[1]

[4]

8050ma1010


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5.8 ADU drive

5.8.1 Bypass tray drive

[1] Up/down gear [5] Drive coupling[2] Paper feed roller /BP [6] Feed roller /BP[3] Double feed prevention roller /BP [7] Paper feed clutch /BP (MC6)[4] Paper feed motor (M41) [8] Tray up drive motor /BP (M35)

[4]

[3][5]

[1]

[6] [8][2][7]

8050ma1011


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5.8.2 Registration drive/loop drive

[1] Loop roller motor (M31) [3] Registration roller[2] Loop roller [4] Registration roller motor (M30)

[3] [2]

[4] [1]

8050ma1012


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5.8.3 ADU conveyance drive

[1] Intermediate conveyance roller /2 [10] ADU conveyance clutch /2 (MC1)[2] Intermediate conveyance clutch /2 (MC4) [11] 2nd transfer section[3] Paper feed motor (M41) [12] 2nd transfer pressure/release motor (M34)[4] ADU pre-registration roller [13] Intermediate conveyance roller /3[5] ADU pre-registration clutch (MC3) [14] Intermediate conveyance clutch /3 (MC5)[6] ADU conveyance roller /1 [15] Drive coupling[7] ADU conveyance clutch /1 (MC2) [16] Transfer belt[8] Timing belt [17] Pressure arm[9] ADU conveyance roller /2 [18] 2nd transfer roller

[4] [5]

[1] [2]

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

[11]

[14][13]

[15]

[17]

A

A

A

[16]

[3]

[18]

8050ma1013


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5.8.4 Reverse paper exit drive

[1] Reverse gate [4] Reverse/exit roller /2[2] Reverse/exit motor (M33) [5] Decurler roller[3] Reverse/exit solenoid (SD4)

8050ma1014[2]

[1]

[5]

[4]

[3]


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5.9 Main body paper exit drive

[1] Reverse gate [4] Reverse/exit roller /2[2] Drive coupling [5] Timing belt[3] Reverse/exit motor (M33) [6] Paper exit roller

8050ma1015[3][4]

[1]

[2][5]

[6]


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5.10 Scanner drive

[1] Exposure unit [4] Scanner drive wire /R[2] Scanner drive wire /F [5] Scanner motor (M1)[3] V-mirror unit

FRONT

8050ma1016

[5]

[1][4]

[3] [2]

IMAGE CREATION PROCESS KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004

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6. IMAGE CREATION PROCESS6.1 Image creation flow and function

Step Process FunctionStep 1 Charging process Forms the layer of charges on the photosensitive drum.Step 2 Laser exposure process Form an electrostatic latent image on the photosensitive drum.Step 3 Developing process Makes an electrostatic latent image visible.Step 4 1st transfer process Forms an image by synthesizing on the transfer belt a mono-

chrome (YMCK) visible image from each photosensitive drum.Step 5 2nd transfer process Transfers an image on the transfer belt to paper.Step 6 Separation process Separates paper from the transfer belt after completion of the

transfer of the toner.Sub step 1 Drum cleaning Removes toner adhered on the surface of the photosensitive

drum after completion of the primary transfer.Sub step 2 Pre-charging exposure Removes residual potential on the surface against the photosen-

sitive drum after completion of drum cleaning.Sub step 3 Transfer belt cleaning Removes toner adhered on the surface of the transfer belt after

completion of the 2nd transfer.Sub step 4 2nd transfer roller /L

cleaningRemove toner on the 2nd transfer roller /L after completion of the 2nd transfer.

Sub step 5 Toner collection Collects toner that has been removed through the drum cleaning and the transfer belt cleaning. (Not shown in the drawing below.)

[1] Developing unit [7] Separation neutralizing section[2] Write unit [8] 2nd transfer roller /U[3] Charging corona [9] Transfer belt[4] Pre-charging exposure lamp (PCL) [10] Blade (drum cleaning)[5] Paper [11] Blade (transfer belt cleaning)[6] 2nd transfer roller /L [12] Drum

8050ma1017

[1]

[12]

[11]

[10]

[9]

[8]

[7]

[6]

[5]

Sub step 3

Sub step 1

Sub step 2

Step 5 / Sub step 4

Step 4

Step 3

Step 1

Step 2

Step 6

[2]

[3][4]

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 IMAGE CREATION PROCESS

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6.2 Charging process (Step 1)The charging corona, having a gold-plated tungsten wire, is applied with a high DC voltage (minus) to neg-atively charge the surface of the photosensitive drum by wire discharge. The charging corona is providedwith a charging control plate to make charges on the surface of the photosensitive drum uniform. Photo-sensitive drums are provided for the four colors of Y, M, C and K.

6.3 Laser exposure process (Step 2)Charges on the surface of the photosensitive drum have a characteristic that when they are irradiated withlight, they are neutralized and vanish. Using this characteristic, a laser beam is irradiated on the imageregion to create an image by removing charges on the photosensitive drum. This image is referred to asan electrostatic latent image. A Laser beam is irradiated on each photosensitive drum of Y, M, C and K cor-responding to the four color data resolved by the image processing section.

[1] Drum [3] Charging corona[2] Charge (negative) [4] Charging control plate

[1] Write unit [3] Neutralized section[2] Laser beam [4] Charge (negative)

8050ma1018[3]

[2]

[1]

[4]

8050ma1019

[1]

[3]

[2]

[4]


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6.4 Developing process (Step 3)In the electrostatic latent image on the photosensitive drum, the non-image section is negatively chargedand the image section is neutralized. When toner, that is, negatively charged is brought close to the photo-sensitivity drum, toner is attracted to the image section on the drum by the potential difference with thedeveloping bias and becomes visible. This process is called developing.

[1] Drum [3] Toner (negative)[2] Charge (negative) [4] Developing sleeve

8050ma1020

[1]

[2] [3] [4]

KONICA MINOLTA 8050/CF5001/C500/8150 Ver.3.0 Dec. 2004 IMAGE CREATION PROCESS

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6.5 1st transfer process (Step 4)Toner on each drum of Y, M, C and K is transferred onto the transfer belt, this allows for overlapping of thecolors. This movement of toner from the drum to the transfer belt is referred to as the 1st transfer, wherethe transfer of toner is carried out sequentially in the order of Y, M, C and K.While in the 1st transfer, the 1st transfer roller provided at the rear of the transfer belt is applied with a highDC bias voltage (positive). As a result, a positive potential on the surface of the transfer belt is higher thanthat of the surface of each drum, and toner moves from the drum to the transfer belt.

[1] Drum /Y [5] Charge (negative)[2] 1st transfer roller /Y [6] Drum /M[3] Transfer belt [7] 1st transfer roller /M[4] Toner /Y [8] Toner /M

8050ma1021

[2]

[3] [4] [5]

[1]

[7]

[8] [5]

[6]


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6.6 2nd transfer process (Step 5)The operation to transfer the toner image of the four colors on the transfer belt to paper is referred to asthe 2nd transfer. While in the 2nd transfer, the 2nd transfer roller /L provided at the lower section of thetransfer belt conveys paper while pressing it against the transfer belt. At this time, the 2nd transfer roller /Uprovided at the rear of the transfer belt is applied with a high DC bias voltage (negative). Toner on thetransfer belt is shifted toward the paper by the electric field formed between the 2nd transfer roller /U andthe 2nd transfer roller /L.

6.7 Separation process (Step 6)While in the 2nd transfer, paper in the process of transfer is negatively charged by the 2nd transfer roller /U, resulting in an adsorption phenomenon where paper is attracted to the transfer belt. This operation topeel paper that is thus adsorbed off the transfer belt is referred to as separation.Separation is made by applying high AC and DC bias voltages to the separation neutralizing section. As aresult the charges of the paper and the transfer belt are neutralized.

[1] Transfer belt [3] 2nd transfer roller /L[2] Paper [4] 2nd transfer roller /U

[1] Transfer belt [3] 2nd transfer roller /L[2] Paper [4] Separation neutralizing section

8050ma1022[3]

[2]

[1]

[4]

8050ma1023[3][4]

[2]

[1]

Documents

Bizhub PRO C500 C8150 - Service Manual