Service Manual Epson EMP 50 51 EMP 70 71

7/14/2019 Service Manual Epson EMP 50 51 EMP 70 71

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SERVICE MANUAL

Mult i Media Projector

EMP-50/51(SVGA)

EMP-70/71(XGA)


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EMP-50/51(SVGA) , 70/71(XGA)

0-2 Rev i s io n :B SEIKO EPSON

INTRODUCTIONThis Service Manual describes of the hardware information which is necessary for thesmoothfield service of the MULTE MEDIA PROJECTOR EMP-50/51(SVGA)/EMP-70/71(XGA) andthe trouble shooting.As the primary technologies modification will be supplied with the servicebulletin, you may update this manual.

HOW TO USE THE SERVICE MANUALSince the service manual describes the topics which may be required in the field

maintenance, you may utilize this for repair or diagnosis of failures. The contents are asfollowing. Before you start the maintenance service, read every safety precautions andobserve safety precautions and observe safety rules.

precautions: SAFETY,MAINTENANCE,PERSONchapter 1: GENERAL (PART NAME, SYSTEM FUNCTION, SPECIFICATION, etc...)chapter 2: THEORY OF OPERATION (HARDWARE,INTERNAL CONNECTION,

FUNCTION OF UNITS, etc...)chapter 3: DISASSEMBLE & ASSEMBLE (ASSEMBLY PROCESS FOR MAIN FRAME)chapter 4: TROUBLE SHOOTING

VCCI RADIO FREQUENCY INTERFERENCE SELF RESTRICTIONThis product is the type 1 information equipment and uses radio frequency energy and

fully complies with the limits for the specifications in the computer informationequipment radio interference regulation (VCCI rules). If not installed and used properlymanufacturers instructions, may cause interference to radio and television reception.

TRADEMARKEPSON is the trademark of SEIKO EPSON CORPORATION.

NOTICES1. This document should not be reproduced in whole or in part without the written permission

of SEIKO EPSON CORPORATION.

2. Any of description in this document is the subject to change without notice in future.

3. The information and specification in this document are the most up-to-date at the time of

publication. However, we are unable to guarantee the accuracy of printed material after thedate of publication. In case of any mistake or lack of description, please kindly notify us to

correct.

4. Any influence by utilizing the document may be out of our responsibility regardless the item

3 above.

2001SEIKO EPSON CORPORATION


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SEIKO EPSON Rev i s i o n :B

Record of Revisions

Memo RandomFree area to memorize any important technical information here.

History Issued Date Alternation

REV. A 2000.11.10

REV. B 2001.11.22 ELP-51/71-model addition, a safe test addition


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1. MAINTAIN THE SAFETY OF OPERATORS(1). PROTECTION FROM ELECTRIC SHOCK

Whenever doing any repair work on the product, be sure to turn off the power switch and

remove the power cable from the electrical outlet.

Whenever inevitably turning the power on to the product opening the case or cover (repair

process) be sure to take off any metallic materials such as a watch, cuffs, rings, and tie

pins which may touch the metallic part of the product and dangerous of electric shock.

(2). PROTECTION FROM ACCIDENTAL INJURY

Be sure not to touch the lamp inner housing and its circumstances after the power is

turned off, they may be heated up even after the cooling down process was completed.

Also make sure not to touch the fan (inhale/exhaust/power supply unit A) and safety

switch terminal during the operation of repair as turning the power on.

Make sure to protect your hands by gloves from sharp edges during assembly and

disassembly.

Do not look into the light source or lens while the lights is on. Protect eyes from being

damaged.

(3). PROTECTION FROM ACCIDENTS

Any operation should be done while the device placed on a flat and stable place to prevent

the device or parts from being dropped. Be careful not to place tools and parts on the

device or at your feet.

Whenever doing any repair work on the product, be sure to away from a place for

foreigner come across in order to prevent the product from being used in incomplete

condition or accidental near miss. Be sure not to leave the product during any repair work.

Be sure to use attached power cable and secure the earth line when you supply the power

to the product.

2. SAFETY MAINTENANCE(1). PROTECTION FROM ELECTROSTATIC DISCHARGE

Whenever doing any repair work on the product, be sure to wear the wrist band and the

electrostatic mat with grounding. When replacing any electric components (Boards and

Optical engine), it is recommended to touch the electrostatic plastic bag of the component

to the metallic part of the product once before take out the component from plastic bag.

(2). LIMITATION OF PARTS

Use only authorized or supplied parts from EPSON for the parts replacement including the

lamp inner housing, and so on.

Use only the power cable and the interface cables attached with the product.

(3). SAFETY TESTING

The following tests should be carried out on repair parts used in the LCP.

(3-1).Test items

Insulation resistance test

Ground continuity check

Illumination check


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(3-2).Testing procedure

Carry out testing in the order given below.

(3-3).Testing methods1).Insulation resistance test

Repair EndInsulation resistance test Ground continuity check

Safety inspections

Illumination check

ab

Testing apparatus: Insulation ohmmeter (Rating: 500 V/100 M)

Check item Inspection method Standard/Judgment level

Insulation ohmmeter Insulation resistanceshould be 10 M or more

Insulation ohmmeter settings

c Caution:Because high voltages (500

V) are present, do not touch

the probe during testing.

(1)

(2)

1.Set the range selection switch to 500 V.

2.Connect the black lead wire to the ground terminal.3.Connect the red lead wire to the line terminal.

4.Connect the black lead wire (crocodile clip) to c in order

to measure the insulation resistance (1) (between a and

c) in the diagram below.

5.Next, insert the probe of the red lead wire into a.

6.Set the measure switch to LOCK, and then measure the

insulation resistance after 1 minute.

7.Check that the insulation resistance after 1 minute is 10

M or more.

8.Next, measure the insulation resistance at (2) (between

b and c) in the diagram below in the same way as for (1).

9.Check that the insulation resistance at (2) after 1 minute

is 10 M or more.

Ground terminal

Line terminal

Display

Measure switch

Range selection switch

Power supply lines

Projector AC inlet

Exposed metal part of projector Computer IN connector


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2).Ground continuity check

3).Illumination check

Test conditions: Input a PC or video signal to the LCP and check the illumination for about

5 minutes.

Judgment: Projector should operate normally with no smoke or fire.

Testing apparatus: Multimeter (with sensitivity down to 0.1 )

Check item Inspection method Standard/Judgment level

Multimeter Should be no resistance(0.5 or less)

Multimeter settings

DC/AC, SW

(1)

1.Turn on the power switch.

2.Set the range selection switch to .

3.Connect the black lead wire to the COM terminal.

4.Connect the red lead wire to the V//Hz terminal.

5.Check that the resistance at (1) in the diagram

below is 0.5 or less.

COM V ,

, Hz

Terminals

Range selection switch

Display

AC inlet ground

Projector AC inlet

Exposed metal part of projector

Computer IN connector


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(4). Others

Visually check the distortion or dirt at the connectors of the power cable. If dirty, clean off,

and if distorted, replace the cable in order to avoid firing by the flush over phenomenon.

When plug the internal connector cables or the interface cables, be sure to fully plug into

the connectors until it stack to the connector edge.

Whenever doing removal of parts or repair work on the product, make sure that the work is

done in a clean room, free of dust and dirt in order to keep the optical element away from

dirt. When disconnecting the operation panels FPC cable from the CN501 connector on the

MA board, be sure to release the connector lock first. The connector lock should be

unlocked by pulling up the both end of connector lock simultaneously with tweezers.

Unlock the connector lock before disconnect the three FPC cables of the light valve and

MA-IF cable. (Pull up the black area of the connector.)

3. REQUIREMENT FOR THE MAINTENANCE PERSONAuthorized person should have the following knowledge and skill for the maintenance of EMP-50/51,EMP-70/71.

Need to sufficiently understand the operation and the descriptions of Users manual.

Need to have the basic knowledge of electricity (safety operation, circuit diagram,

electrostatic, and else...)

4. OTHERS Any questions on the EMP-50/51,EMP-70/71 maintenance including supply of the service

parts or contents of the document would like to be contacted to the below address. Any

technical information about amendments is occasionally available as the service bulletin.

SEIKO EPSON CORPORATION

ADDRESS: 4897 SHIMAUCHI,

MATSUMOTO-SHI, NAGANO-KEN 390-8640 JAPAN

TEL: 81-263-48-5437

FAX: 81-263-48-5680

ATTN: VD CS Group

Explored view of CN501

Lock

Unlock

CN501

light valve FPC

Lock state Unlock state (Pulling up the black area)

FPC cableconnector lock

FPC cableconnector lock


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Chapter 1 Product general1.1. PRODUCT GENERAL ............................................................................ 1-2

1.2. PART NAME ........................................................................................... 1-3

1.2.1. Outside View of Main Frame ........................................................... 1-3

1.2.2. Inside View of Main Frame.............................................................. 1-5

1.2.3. Outside View of Remote Controller ................................................. 1-7

1.3. SPECIFICATIONS .................................................................................. 1-8

1.4. INTERFACE SPECIFICATION ............................................................. 1-101.4.1. Computer....................................................................................... 1-10

1.4.2. Audio-In ......................................................................................... 1-11

1.4.3. Audio Out ......................................................................................1-11

1.4.4. S-Video.......................................................................................... 1-11

1.4.5. Composite VideoVideo-Audio Interface ....................................... 1-12

1.4.6. Mouse/Com ................................................................................... 1-12

1.4.7. USB Mouse ................................................................................... 1-12

Chapter 2 Theory of operation

2.1. HARDWARE ........................................................................................... 2-22.1.1. Electrical System Connections........................................................ 2-3

2.1.2. Circuit block..................................................................................... 2-4

2.1.3. Process Outline ............................................................................... 2-5

2.2. Optical Engine......................................................................................... 2-6

2.3. POWER SUPPLY UNIT.......................................................................... 2-9

2.4. BALLAST UNIT..................................................................................... 2-12

2.5. MA BOARD........................................................................................... 2-13

2.6. OPERATION PANEL ............................................................................ 2-16

2.7. IF BOARD ............................................................................................. 2-17

2.8. RECEPTOR SENSOR.......................................................................... 2-19

2.9. SPEAKER ............................................................................................. 2-202.10. TEMPERATURE CONTROL .............................................................. 2-21

2.10.1. SENSOR/SWITCH ...................................................................... 2-21

2.10.2. Lamp Cover Detection Switch ..................................................... 2-21

2.10.3. SAFETY SWITCH ....................................................................... 2-22

2.10.4. THERMISTOR AND TEMPERATURE SENSOR OPERATION . 2-22

2.11. FAN OPERATION............................................................................... 2-24

2.12. LED INDICATOR ................................................................................ 2-26

Chapter 3 Disassembly and assembly3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES ............................... 3-23.2. DISASSEMBLING THE MAIN UNIT ....................................................... 3-5

3.2.1. Removing the Lamp Inner Housing................................................. 3-6

3.2.2. Removing the Front Case Unit ........................................................ 3-7

3.2.3. Removing the Upper Case Unit....................................................... 3-8

3.2.4. Removing the Speaker .................................................................... 3-9

3.2.5. Removing the Safety switch .......................................................... 3-10

3.2.6. Removing the LAMP Thermistor ................................................... 3-10

3.2.7. Removing the Lamp Fan ............................................................... 3-11

3.2.8. Removing the MA Board Assy ...................................................... 3-11

3.2.9. Removing IF Board/IF Fixing Plate ............................................... 3-13
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3.2.10. Removing the Shilde plate RE/Lampe fan duct........................... 3-13

3.2.11. Removing the Optical engine ...................................................... 3-14

3.2.12. Removing the Focus ring ............................................................ 3-16

3.2.13. Removing the Projection Lens .................................................... 3-16

3.2.14. Removing the PBS fan/Ballast duct Unit ..................................... 3-17

3.2.15. Removing the Intake (L/V) fan..................................................... 3-17

3.2.16. Removing the Ballast unit............................................................ 3-18

3.2.17. Removing the Exhaust fan .......................................................... 3-18

3.2.18. Removing the Lamp Cover Detection Switch.............................. 3-19

3.2.19. Removing the Power Supply Unit................................................ 3-19

3.2.20. Removing the Foot unit/Rear foot ............................................... 3-20

Chapter 4 Troubleshooting4.1. BEFORE STARTING TROUBLESHOOTING PROCEDURES ..............4-2

4.1.1. Tools and Accessories Required for Troubleshooting..................... 4-2

4.1.2. Field Replacement Parts ................................................................. 4-2

4.2. ENTRY.................................................................................................... 4-3

4.2.1. Outside view.................................................................................... 4-44.2.2. Internal cable connections............................................................... 4-5

4.2.3. Power ON/OFF................................................................................ 4-6

4.2.4. Display/Picture quality ..................................................................... 4-8

4.2.5. Audio output .................................................................................. 4-10

4.2.6. Operation panel............................................................................. 4-11

4.2.7. Remote controller .......................................................................... 4-12

4.2.8. Mouse/Com, USB Mouse.............................................................. 4-13

4.2.9. Others............................................................................................ 4-14
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Chapter 1 Product general


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1-2 Rev is io n :B SEIKO EPSON

1.1. PRODUCT GENERAL

EMP-50/51 EMP-70/71 MULTI MEDIA PROJECTOR designed as the new model of EPSONprojector series is the portability device with SVGA (EMP-50/51)/XGA (EMP-70/71) resolutionto project enhanced color images from the personal computers CRT and any one of videoequipment such as video tape deck, video camcorders or digital camera.

FEATURE OF EMP-50/51,EMP-70/71

Portable light weight, compact size

The new type of power unit and circuit board and the simple structure enables to minimize

the body in A4 file size [220(D)x300(W)x80(H)mm] with the weight of 3.1 kg.

Bright and clear image

A compact, high-luminance lamp inner housing (EMP-50/70 UHE-150W.EMP-51/71

UHE-160W) and an optical block produce images with a luminance of 1200lm (for the

EMP-51)1000lm (for the EMP-50/71) or 700lm (for the EMP-70). The size of the projected

image can be set within a range of 30300 inches (projection distance 1.011.0 m).

High resolution full color (16770 thousands colors)

EMP-50/51: 3 (R, G, and B) of TN liquid crystal panels of 480,000 pixel will supply SVGA

resolution of 800 x 600 dots.

EMP-70/71: 3 (R, G, and B) of TN liquid crystal panels of 786,432 pixel will supply XGA

resolution of 1024 x768 dots.

Standard attachment of remote controller

The projector can be controlled using a handheld remote control unit, with menus being

provided for Image source switching and Image adjustment.

Connectivity with various computers

The advanced data signal determination function enables EMP-50/51,EMP-70/71 to

connect with various computers such as IBM-compatible PCs and laptops, Macintosh. It

also determines video signal of NTSC, PAL or SECAM in composite video, S-Video

format.

Advanced Image Real-time Resizer

The projector also features a new customized resinging processor (Advanced ImageReal-time Resizer) chip for supporting of miscellaneous video signals. No matter what

type of output is used, the result is full-size video image of outstanding clarity.

Low noise

Less than 42dB at operation.

Automatic Video Tracking

A totally new AVTSSTM (Automatic Video Tracking and Synchronization Sensing, patent

pending) provides automatic setup of image from a computer with a touch of the AUTO

button for quick and easy projection of beautiful images every time.

Simple Maintenance

The easy maintenance. Number of image adjustment process is not required.


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1.2. PART NAME

1.2.1. Outside View of Main Frame

Projector Unit

Figure1-1

Operation panel

Figure1-2

Warning indicatorOperation display indicator

Operation panel

Speaker

Receptor part

Projection lens

Focus ring

Air Intake vent

Foot leverFront foot

TeleWide

Air Intake vent

Input/Output terminals

Help button

Power button

Source button

Keystone() button

ON/OFF of the switchingpower supply.

Explain the treatment method

when the trouble is broke outin terms of the item.

Switches input source.Computer S-video Compos-ite Video Computer. Not con-necting S-Video, S-Video is notselected.At Help menu, it works enter key.

At Help menu, it works

Adjust the screen when it wasdistorted to the trapezoid.

+/- key.


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Input Terminals

Figure1-3

Figure1-4

Out put the audio signal tothe external speaker.

Input the S-video signalof the A/V devices.

Input the video signal of

the A/V devices.

Input the audio signal fromthe computer by the stereo

Input the video signal from thecomputer, or the RGB videosignal.

Input the audio signal from the

A/V devices.

mini jack.

Audio Out TerminalS-Video Terminal

Video TerminalR-Audio-L Terminals

Computer/

Audio In Terminal

USB Mouse Terminal

Mouse/Com Terminal

Used when usingthe remote control asa wireless mouse.

Used when usingthe remote control asa wireless mouse.

Component Terminal

AC inlet Air exhaust vent


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1.2.2. Inside View of Main Frame

Figure1-5

Figure1-6

IF board assembly

Exhaust fan

Power supply unit

Ballast unit

Lamp fan

MA board

Safety switch

LAMP thermistor

Projection lens

L/V thermistor

Speaker

Operation panel


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Figure1-7

Figure1-8

Figure1-9

Foot unit

Foot

RC photosensor

Foot unit

Footlever Llever R

Rear foot

Lamp fan

Lamp inner housing


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1.2.3. Outside View of Remote Controller

Remote controller

Figure1-10

POWER Button

Freeze Button

Effect Button

Press this button to accept

When projecting images from

If a menu is being displayed,

Menu Button

S-Video Button

This button is used to

This button is used to

This button is used to momentarily

This button is used to activate

This button is used to momentarily

If you press the button once more, or

A/V Mute Button

EnterButton

When the Enter button is pressed up or

the assigned effect function.

turn off the picture and sound.

if you press the Esc button orthe Volume button,normal playback will resume.

pause playback of moving pictures.If you press the button once more, orif you press the ESC key,normal playback will resume.

turn the projector power on and off.

menu selections.If cascading screens are being displayed,the screen directly underneaththe current screen will be displayed.

a computer, this button operatesin the same way as the left buttonon a two-button mouse.

down or to the left or right, the remotecontrol unit operates as a wireless

mouse to move the pointer movesin the direction that the button waspressed.

optimise computer images.

Auto Button

This button is used to switch to

Computer ButtonThis button is used to switch toa picture which is being input

from the computer terminal.

a picture which is being inputfrom the S-Video terminal.

the currently-selected item canthen be adjusted.When the Enter button is pressed upor down or to the left or right,the bar moves in the direction thatthe button was pressed.

This button is used to display andclear on-screen menus.

The remote control signals are

Remote Control Light Part

output from here.

This switch is used to turn

R/C ON OFF Switch

the remote control unitspower supply on and off.

This button is used to activate

E-zoom Button

the E-Zoom function in order toenlarge or reduce the size ofthe projected images.The function can be cancelledby pressing the Esc button.

This button is used to cancel

Esc Button

To enlarge

To reduce

the function which is currentlybeing used.

If a menu or help screen isbeing displayed, the screendirectly above the currentscreen will be displayed.

When projecting images froma computer, this buttonoperates in the same way asthe right button ona two-button mouse.

This button is used to provideHelp Button

explanations of the variousprojector functions andoperations. You can usethis feature if you are not surewhat to do.

This button is used to switch to

Video Button

a picture which is being inputfrom the video terminal.

This button is used to adjust

Volume Button

the volume.

DOWN UP

IndicatorLights during signal output fromremote control.


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1.3. SPECIFICATIONS

Table 1-1OPTICAL FEATURES EMP-50/70 EMP-51/71

Display method Transparency type poly-silicon TFT color liquid crystal display (R/G/B three panels)

Optical method Dichroic mirror separation and prismcombine method

Projection image size Minimum 30 inch to maximum 300 inch

Projection distance 1.0 m to 11.0 m

Resolution EMP-50: 800 x 600 dotsEMP-70: 1024 x768 dots

EMP-51: 800 x 600 dotsEMP-71: 1024 x768 dots

Projection Lens F1.5 (26.3 mm)

Focus adjustment Manual

Zooming adjustment Digital(1:1.2)

Lamp inner housingLamp life (Lamp inner housing)

UHE discharge lamp 150WLife : 1500 hours (at 50% brightness orwhen survival rate is 50%)Average illuminance: EMP-50:1000lm

EMP-70:700lmAverage illuminance ratio:90%

UHE discharge lamp 160WLife : 1500 hours (at 50%brightness or when survival rateis 50%)Average illuminance

EMP-51:1200lmEMP-71:1000lm

AUDIO FEATURES

Output for internal speaker Dynamic speakers 8

-1W (monaural)

Audio out Interface(Audio-OUT)

External speaker 3.5mm Stereo mini-jackInternal speaker output is stopped whenmini-jack is plugged.Output signal:0 to 500mVrmsload imperdance:600 (Adjustable withvolume selection)

Video Audio L/R interface(Audio L/R)

Audio signal(monaural) from the videodevices.Interface type: RCA jack (white: Stereo L ormonaural/Red: Stereo R)Input signal:500mVrms/47k

Audio In interface(Audio In)

Host computer Audio input (monaural)Interface type:3.5mm Stereo mini-jackInput signal: 500mVrms/47K

REMOTE CONTROL

Wireless remote controller For controlling EMP-50/51,EMP-70/71operating mode.Signal is detected with internal receptorboard.Control range: Within 10 m and 30 degreefor right and left, 15degree for up and downfrom receptor.

VIDEO INPUT/OUTPUT

Computer interface(PC-RGB)

Host computer RGB outputInterface type: HD-15pin(DDC1/2Bcompatible)Input signal:0.7Vp-p,75.

S-Video Interface Interface type: Min-DIN 4pinLuminous:1.0Vp-p, Chrominous 0.284Vp-p.

Video interface(Composite video) Input signal: 1.0Vp-p,sync.negative 75

.Interface type: RCA jack (yellow)TV signal type: NTSC3.58MHz,NTSC4.43(4.43MHz)

PAL 4.43MHz,N-PAL(3.58MHz), MPAL( 3 . 5 8 M H z ) ,PAL60(4.43MHz)SECAM 4.43MHzAuto identification(Default)

MOUSE/COM

Serial Mouse or RS-232CPSADB

Auto identification (PS/2 Mouse or RS-232C)Interface type: DIN 9pin


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USB MOUSE

USB Mouse USB MouseInterface type: USB connector series B

POWER SUPPLY, etc.

Input Voltage AC100-120V /220-240V10% (50/60Hz)

Power Consumption Approx. 230 W (Standby mode:8.6W)

Dimensions 220 mm (D) x 300 mm (W) x 80 mm (H)

Weight Approx. 3.1 kg

ENVIRONMENTOperational/storage temperature +5C~+35C / -10C~+60C (non condensing)

Operational/storage humidity 20%~80% / 10%~90% (non condensing)

Operational/storage Altitude 2286/9144m

Table 1-1


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1.4. INTERFACE SPECIFICATION

Figure1-11

1.4.1. Computer/Component Video Interface

Computer video input D-Sub 15 (HD)

Pin No.Pin name

Pin No.Pin name

Computer Component Computer Component

1 Red video signal Cr / Pr 9 (None) (No pin) (No pin)

2 Green video signal Y 10 Sync GND None

3 Blue video signal Cb / Pb 11 Monitor bit

ID bit 0

None

4 Monitor bit

ID bit 2

None 12 SDA None

5 GND None 13 Horizontal sync/

composite sync

None

6 GND GND 14 Vertical sync None

7 GND GND 15 SCL None8 GND GND

CN1007513S-15G2


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1.4.2. Audio-In (Computer audio input) Interface

Stereo mini jack with 2 circuits for detection pin(The detection pin which is not required for audio input, is equipped for audio out terminal.)

1.4.3. Audio Out (audio output) Interface

Stereo mini jack with 2 circuits for detection pin

1.4.4. S-Video Interface

Mini DIN 4-pin with a detection pin

Pin No. Signal name

1 GND

2 Computer audio input L

3 Computer audio input R

4 GND

5 GND

6 GND

7 GND

8 GND

9 GND

J000

LGS6507-0

800

6

2

3

7

8

4

5

DGND

9

1

Pin No. Signal name

1 GND

2 Audio output L

3 Audio output R

4 NC

5 AJET

6 GND

7 GND

8 GND

9 GND

6

2

3

7

8

4

5

LGS6507-0800

DGND

9

1

J001

Pin No. Signal name

1 GND

2 GND

3 Y signal input

4 C signal input5 Input detect pin

6 GND

1

34

2

CN000

TSC7708-012021


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1.4.5. Composite VideoVideo-Audio Interface

1.4.6. Mouse/Com Interface

1.4.7. USB Mouse Interface

RCA pin jack x 3

8

7

6

5

3

2

1

CN001

JPJ47

91-010234

DGND

CVBS(Yellow)

L(White)

R(Red)

DGND

4

Pin No Signal name

1 GND

2 CVBS3 GND

4 NC

5 VAINL

6 GND

7 VAINL

8 VAINR

1 2

3 4 5 6

7 8 9

DGND

CN900

35128A-09G2T

Mini DIN 9-Pin

Pin No Signal name

1 PCV

2 CLK/ADB

3 DATA

4 TxD

5 RxD

6 DTR

7 DSR

8 IDO

9 GND

Pin No Signal name

1 VCC

2 D -3 D +

4 GND

12

3 4

DGND

CN901

UC1112C-K1

USB connectorseries B


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Chapter 2 Theory of operation


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2.1. HARDWARE

The hardware of EMP-50/51,EMP-70/71 is distinguished in the optical system and theelectrical system.Inside of the breaking line in the Figure2-1 is the optical engine(one maintenance part).

Figure2-1

(Projection process outline)

1. Analog signal (S-Video or Video signal) is provided to the MA Board through IF board.

(Analog signal should be once changed into digital signal by the IF Board.)

2. The display signal (digital) is stored temporarily in the video memory of the MA board, after

which it is output as the signal to drive the R/G/B light valves.

3. The light valves R/G/B are individual panels each others. They work to shut or transmit the

lights from the light guide unit.

4. The lights transmitted through the light valves will be combined with the prism and projected

through the projection lens unit.

Power supply unit

Generate DC bias

Ballast unitGenerate lamp

Computer

Exhaust fan *2

150W(EMP-50/70)

Lamp inner

MA board

Initial setting of the cirduit and interface control.

IF

Operation panel

Receptor sensor

Projection lens unitPrism

R/G/B

Light valveR/G/B

Light guide unit

Divide the optical souce into *1:Intake fan cools light valve R/G/B(Liquid crystal panel)

Audio-OutAudio L/R

S-Video

Video

Mouse/Com

USB Mouse

Intake fan *1

Generate ballastbias

power

board

(Focus)

three (R/G/B) with lens, filter

and mirror

AC input

Produce R/G/B video signal

*2:Exhaust fan discharges the heat oflamp inner unit mainly.

*3:Please treat area as one part onthe repair.

Composit

(Senser, Fan, Speaker, Remotecontrol etc.)

PBS fan

Lamp fan

housing

(Includes MA board)

160W(EMP-51/71)


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2.1.1. Electrical System Connections

Electrical units are physically connected mainly to the MA Board as shown below.

Figure2-2

Basically, EMP-50/51 and EMP-70/71 circuit are same except number of compornents, etc.

S

P

CN800 SP

CN1005 EX Fan

CN1100 Power supply unit

PJ080 MA board

CN500 ON/OFF

CN1102 SCI

CN1002 Lamp Fan

CN1001 PBS Fan

CN1003 L/V TH

CN1004 Lamp TH

CN501 SW Panel

Operation

panel

CN1000 L/V Fan

CN1800 XGA-R

CN1801 SVGA-R

CN1701 SVGA-G

CN1700 XGA-G

CN1600 XGA-B

CN1601 SVGA-B

Circuit

board

connector

CN300

CN101CN100 PC input terminal

CN901 USB

input terminal

CN900 COM input terminal

J000 Audio-IN terminal

CN000 S-Video terminal

J001 Audio-OUT terminal

CN001 CVBS VideoAudio terminal

Power

supply

unit

Ballast

unit

Lamp

Cover

Detection

switch

Exhaust

fan

PBS

fan

Lamp

fan

Intake

fan

Lampthermistor

L/Vthermistor


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2.1.3. Process Outline

1. The video input signal is sent from the "Computer" interface (analog RGB) or from the IF

board (analog) to the MA board. (Video signals are converted to digital signals at the IF

board.)

2. Display video signal (digital) is once stored in the video memory (SRAM) on the MA board

then the DR board generates signals to drive the light valves R/G/B.

3. The light valves R/G/B are individual panels each others. They work to shut or transmit the

lights from the light guide unit.

4. The lights transmitted through the light valves will be combined with prism and projected

through the projection lens unit.

5. The audio signal is provided from IF board interface and out put to the built in speaker or

external speaker (Audio Out) via a audio controller.

Circuit process block

Figure2-4

MA board

Resizing

Display control

croma

RGB (analog)

Video (analog)

Audio-Out

Speaker

Display

LCDdriver

R

G

B

Light valve

R/G/B

processor

Audio

Amplifirer

signal

signal

Audio signal

processor(Main CPU)

Power savecontroller

Video

ADC

contoroler

amplifiercorrection

(Computer/Video)


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2.2. Optical Engine

The optical engine consists of 4 blocks (Lamp inner unit,Light guide unit, Light valve RGB/Prism unit, and Projection lens unit) as shown below. These units are combined as a set into asingle service unit for carrying out adjustments.Optical engine is different with EMP-50/51, EMP-70/71 and there are no compatibility.

Figure2-5

! Caution: Take care not to cause any shock or mechanical stress to the optical system and also not to

disassemble the light guide unit. Otherwise, the pixel divergence may occur.

The alignment adjustment for each other is applied in the factory, and also electricalcorrection is applied with MA board according to the each optical system. Therefor do notexchange each unit to the other optical engine.

The data that was adjusted in accordance with the characteristic of L/V has been written tothe MA board. Absolutely it makes the optical engine and the MA board the set and ask therepair

Table 2-1 Unit function

UNIT NAME FUNCTION & REMARKS

Lamp inner unit Include one Discharge Lamp as a light source.

Light guide unit Disperse the light from the light source and uniform by the lens array A/B. (Ultraviolet

ray also eliminated.)

Disperse the light in three (R/G/B) factors with condenser lens and mirror.

Light valves/Prism unit Consist of three light valves, polarization plate and prism unit.

Each light valve controls shutter of pixels.

Prism unit composes R/G/B optical signals and transfers to the projection lens unit.

Projection lens unit A focus is adjusted and it projection on a screen.

Projection lens

Light valve (B)

Prism unit

Light valve (G)

Light guide unit

Light valve (R)

Lamp inner unit


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(1).LAMP INNER UNITThis unit consists of the lamp inner housing and the ballast power supply connector. The lampfixed on the base of the lower case is user replaceable item you can purchase it at EPSONservice center.The average brightness of the lamp is reduced corresponding to its running hours. When thelamp is new, its brightness is maximum. After running about 1400 hours, the lamp reduces itsbrightness to almost half of a new one.The power connector is applied to receive the AC voltage from the ballast unit, so its lead wire

is connected to the lamp.

Figure2-6

1. The lamp inner unit

The brightness of the light source lamp reduces in proportion to its running hours as

mentioned above. In this device the standard lamp life is 1400 hours. If you notice the lampbrightness reduces, we recommend you to replace the lamp inner unit even before 1400

hours.

The total running hour of the lamp inner unit is written in IC109 (EEPROM) on the MA

Board. If the lamp is reaching or has reached the end of its life, IC502 (power save

controller) outputs some signals to control the following.

(1)When the cumulative running time reaches 1,400 hours (1,400 hours or more), the prob

lem/warning indicator flashes red at 1-second intervals. The controller (IC502) on the MAboard monitors the cumulative running time and writes the data to IC109. The lamp willonly continue to operate for 100 hours after the problem/warning indicator starts to flash, soyou should replace the lamp as soon as possible at this time.

(2)When the cumulative running time reaches 1500 hoursThe normal operating life of the lamp inner unit is 1500 hours.Please perform "Reset Lamp Timer" with an "About Menu" after exchanging lamps.

Power connectors


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2. Light guide unit

The light guide unit consists of three output filters (R, G and B). It filters out harmful

ultraviolet radiation from the light which is output from the lamp inner unit, and also

disperses the light so that even luminance is obtained. Inside the light guide unit are

lenses for dispersing the light from the light source, and mirrors for separating the light

into its spectral components. The diagram below shows internal views of the light guide

unit

Optical Process block

Figure2-7

! Caution:A light guide unit, an optical head / prism unit, and a projection lens unit are collectively dealt

with by the name "optical engine."

he figure 2-25 shows the control circuit.

Projection Lens

Light Valve G

Light Valve B

Lamp inner

housing

(Light Source)

Ballast Unit

MA Board

Prism (R/G/B synthesize)

Light Valve R

CN1100

IC502

(PSCI)

LED

IC109

EE-PROM

Lamp off detection

LPSTC/LMPON

MA block

indicator

Lamp innerhousing Ballast unit Power supply unit

Power ON/OFF controlPower down detectionBallast output control

Ballast output ON/OFF


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2.3. POWER SUPPLY UNIT

The Power supply unit is consist from AC inlet, filter circuit and fuse.

Figure2-8

(1). Circuit block

Figure2-9

Fuse : Overcurrent protection with malfanction of power supply unit or etc.It blows the fuse with overcurrent condition.

EMI filter circuit : Noise reduction for AC input.

AC Inlet Filter Circuit assy

EMI FilterAC input

Ballast unit

To CP1 connection

DC output

MA board

CN1100(PS)

To connector

connection

Secondary power supply

Smooth output

Safety switch

AC INLET

Primary power supply

Smoothing/control block


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2-10 Rev i s i o n :B SEIKO EPSON

(2). Outline of function

The power supply units output cable is connected to the CN1100 (P/S) connector on the

MA board, and is used to connect the following voltages and signals.

PWDS signal for the power down detection,

DC output (+2.5V/+3.3V/+5V/+9V/+14V/+19V/-7V),

Fan control signal (FANCL)...The control signal of the fan in the power supply unit.

Power on/off signal (PWON),

Trickle power (+3.3V/+5V).

! Caution:If the AC power cable is still connected after the power is shut off, +3.3V and +5V trickle

background voltage are supplied to the MA board via CN1100(P/S) connector. The trickle

voltage is subsequently supplied to the power on/off circuit.

The EMI filter and primary regulator circuit work to neglect noise on the AC line and

generate DC voltage for the regulator.

Two of the regulator generates the various level of DC voltage as shown in the next table

in the switching regulator. (The inside of () shows "EMP-51/71")The regulator detects the

voltage output level at the +5V line and feed back to the switching circuit to maintain theconstant output level regardless the load variation.

Each output voltage level is not adjustable.

The fan is built for exhausting the heat generated in the power supply unit. The heat

exhausted by the fan will be exhausted outside by the exhaust fan which is connected to

the CN1001 on the MA board.

Table 2-2

Output

VoltageAccuracy Ripple

Ripple/

SpikeOutput current Protection circuit

Load

capacity

(Reference)

mV p-p mV p-p Min Typ. Max Peak Over

voltage

Over

current

F

+5T +5V 5% 100 200 0.03A 0.15A

(0.12A)

0.5A 1x10ms +7V Intercepti

on

47

(100)

+3.3 +3.3V 5% 100 200 1.0A 1.3A

(0.9A)

4.0A 6x10ms +4.6V Intercepti

on

220

(100)

+8 +8V 10% 200 300 0.3A 0.6A 3.0A 5x20ms +12V - 220(100)

+19 +19V 10% 400 400 0.1A 1.5A

(0.7A)

2.0A 4x20ms +26V - 47x2

Ballast 240-

390VDC

20000

(25000)

30000

(25000)

- 0.5A

360V

(190W)

0.6A 10A 410V -


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(3). Connector/Pin assignment

Figure2-10

Power supply connector (MA board connector CN1100) pin assignment

Pin No. Voltage Signal name Remarks1 +5V 5.0V trickle

2,3 +3.3V 3.3V

4,5 +8V 8.0V

6,7 +19V 19.0V

8 SIGNAL PWON Power supply ON/OFF signal

9~14 GND GND

CN1100

7 1

814


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2.4. BALLAST UNIT

It is the unit that regulates again the DC power supply (DC300-400V/0.4A) for the ballast thatis supplied from the power supply unit to generates the AC power supply (AC45-120V) for theUHE lamp.

Figure2-11

Circuit Block

Figure2-12

(1). Process outline

The sub power supply : The control circuit voltage (+15V/+20V) for the ballast unit isgenerated.

Switching circuit : Perform the switch actuation for the regulation again accordingto the output signal (BACTA) of the MA board unit. (The BACTAsignal control the ON/OFF of the ballast output.) Modify theswitching duty according to the feedback signal from thedetection circuit.

Regulator circuit : The voltage for the lamp of AC45~120V is generated.

Detection circuit : Monitoring the regulator circuit and generates the feedbacksignal of the output voltage in order to stabilize the voltage anddetects the output current. When the lamp inner unit becomesconsume (That the load current of ballast output disappears), theLPSTC signal is transmitted to the MA board unit.

Ballast output connector(connect to

CN500(Connect to

the lamp inner unit)

CP1(Connect tothe power supply unit)

the MA board)

Lamp Cover Detection Switch

regulator circuit

HV

Ballast output

LV

AC45~120V

Detection circuit

Feedback

Sub power supply

+15/+20V

Switching circuit

CP501 (connected to MA Board

CN1102)

CP1 (connected to Power

Supply Unit)

DC input

240~390v

BACTA

LPSTC

LGND


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2.5. MA BOARD

The MA Board controls the main circuit operation of the product. It consists of resizingprocessor (main CPU) Power I/O controller, digitizer (ADC, video amp. etc.), RAM, EEPROM,etc.The MA board controls everything except to generate the display signal and audio/videointerface. The MA board is available as a unit for the service parts.The photographs below show the MA board for the EMP-50.

Figure2-13

Figure2-14

*MA boards are different according to the model and there are no compatibility.

(TOP SIDE)

(BOTTOM SIDE)


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MA board circuit block

Figure2-15

RGBInput

IC102

R/G/B

SDA/SCL

HSNC/VSYNC

IC101

DDC(E2PROM)

IC101/104/103

SYNC.CORRECT

IC350, 351

3ch Video Amp.

3ch ADC

PLL

Sync. Separator

OSC

24.576MHzIC400

Resizing ProcessorGraphic

portPDA0~23

GRO0~23

SCL/SDA

Display

port

RD0~7

GD0~7

BD0~7

SNC.

IC1200

Micro ProcessorInterface

Misc. PeripheralInterface (RESET)

Videoport

IC602Flash ROM(8Mbit)

IC601S-RAM(1Mbit)

PWD

0

15

~

PWA0

19

~

WRRD

CO

NTROL

DTR/DS

R/TXD/RXD

SCL/SD

A

LED0~5, KIN/OUT

POW

ER

CONTROLL

CN352

CN300

Connect toCN101 on theIF Board

IC502

Power Save Controller

CN800

CPU ConnectorIC501

Reset

IC505

EE-PROM

Serial I/F signals

MDB0~7

SMUTE/AJDET/etc.

SCL/SDA

CN100

(Main CPU)

(Power, Serial I/F, etc.)

CN353


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(2). Outline of function

Circuit function is almost same with EMP-50/51, EMP-70/71 MA board except video

control, thus this paragraph explains EMP-50 MA board functions.

IC502(Power save controller) and related circuits are backed up with +3.3V and +5V

which provided from power supply as trickle power. (If the AC cable is connected to the

AC source, power supply provides the +3.3V and +5V for back-up bias even if the power

is turned off condition.)

When the power is turned on with power button on the switch panel or remote to controller,IC502 on the MA board generate the reset signal and initialize the circuit, and the CPU

reads the program from mask ROM and write it into SRAM. Then the CPU initialize the

circuit functions according to the program and indicates the initial image.

Two thermistors (L/V thermistor/LAMP thermistor) detects temperature. If the temperature

exceeds certain degrees, the thermistors signal generates interrupt signal to the IC502

and change the fan operation or shut off the power supply regulation.

These display data are write into the video memory (SRAM) then read out again with

resizing processor.

Video input (S-Video/Video In) signal are provided via IF board. These input signal are

converted to digital with A/D chroma processor and stored into the SRAM.

The EEPROM and timer circuit provided the operating time control of the lamp inner unit.Its operation is described below.

Total running hours are stored to the IC109 (EE-PROM) and increment until new lamp

innerhousing detection.

If the above phenomenon is observed, it is necessary to replace the lamp inner unit.After replacing the lamp inner unit, you must reset the lamp timer manually.

Table 2-3

lamp inner unit status Problem/warning indicator state

When the operating time of the lamp inner

unit exceeds 1400 hours.

When the power is turned on, the problem/warning

indicator flashes red at 1-second intervals.


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2.6. OPERATION PANEL

This panel includes the 4 switches, and is connected to the CN501 on the MA Board. (Refer tothe paragraph 1.2.1 for detail function)

Figure2-16

Help

Keystone

Source

Power


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2.7. IF BOARD

AV board includes an audio control and chroma processor circuit and an interface connectorsfor audio and video signals from a host computer or external devices such as a video device.The interface connectors are shown below.

PC Audio In (External audio input)

Audio Out (Audio output for external speaker) S-Video (Super impose video input: Y/C signal)

Video (Video device image data input: CVBS signal)

Audio L (Video device audio L input)

Audio R (Video device audio R input)

Figure2-17

S-Video

Audio In

Audio Out

Audio RVideoAudio L


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The figure2-18 shows the IF board circuit block.IF board circuit block

Figure2-18

The interface signal lines for S-Video and Video have chroma processor and convert theinput signal to the digital then output signals to the MA Board through the connector CN002.Audio input signals from computer or from a video device (via Audio L/R) are first input to thecontroller and controlled the volume, tone, etc., then are output to the Audio Out interface orthe built-in speaker via power amp. again.The audio controller performs the audio-signal output control based on the SCL/SDA (serialdata/clock) signals provided from the MA Board. (ex. The sound volume control performs theaudio volume control with 21 levels (mute ~ max.) based on the signals from the MA Board.)

S Video

Video

Audio L/R

Audio-OUT(External

CN000Y/C

CVBS

Audio L/R CN002(IF board)

speaker)

Connect to

CN300 on theMA Board.

(Cable connection)

CN001

J001

J000Audio-In


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2.8. RECEPTOR SENSOR

This is the board with the infrared signal detection component. The receptor sensor equippedin the front face.

Figure2-19

The output signal (serial data) which is received by the photosensor is input to the power savecontroller (IC502) on the MA board.

1. The MA board turns the power on and off and controls the menu displays based on theserial data which is received from the remote control unit (from the button switches of the

remote control unit).

2. The serial signal send to the AV board via the MA Board performs the mute, tone control

and audio volume control.

The figure2-20 shows remote control circuit block.

Figure2-20

Receptor element(Infrared ray detector)

Infrared ray MA Board

IC504 IC502PSCI

Remote controller


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2.9. SPEAKER

Two speaker units (8-1W) are equipped inside the upper case, faced upward. The audioinput signal from a host computer or AV devices connected to this can be output in Monauralthrough the units.If an external speaker is connected (with the help of an accessory audio cable) to the Audio-Out terminal, the built-in speakers are disabled.

Figure2-21

Figure2-22

The audio input from the computer or video component is amplified by the control circuits(audio controller and power amplifier) in the AV block, after which it is output from the built-inspeakers which are connected to CN800. Detecting the connection to an external speaker(Audio Out), the MA Board only determines the use of the built-in speaker or the externalspeaker.

Speaker

Video-In

(Audio L/R)

PC Audio

IC800

Audio

Selector

Power Amp.

CN800

Internal speaker

LINE-OUT

(External

Controller

Resizingprocessor(CPU)

Remote Switch

IF Board

CN001

J000

J001

CN002

MA Board

CN300 Driver

ReceptorCN501

IC502PSCI

controller panel

speaker)

sensor


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2.10. TEMPERATURE CONTROL

2.10.1. Sensors and switches

For users safety and safety operation of this projector (for prevention from malfunction), thefollowing devices listed the table are installed in it.

2.10.2. Lamp Cover Detection Switch

This switch is installed on the side of the power supply unit and interlocks with the tab of thelamp cover. If you can turn on the projector with the lamp cover open, the (lamp inner unit)runs and generates the high heat. For replacing the lamp inner unit you open the cover. Forthis reason, the switch is installed to protect you from burn.

The Lamp Cover Detection Switch is installed on the AC input line of the power supply unit.Consequently, if the lamp cover is open, the AC power source is shut off and you can not turnon the power.

Table 2-4 Sensor/switch

Name Location/Type Function/Use

Lamp Cover Detection Switch Ballast unit Power off, in opening the lampcover. (Power on is disabled.)

Safety switch Thermal switch on the light guide unit Overheat protection for lamp inner unit area. Power is shut,temperature exceeds limitation.

LAMP Thermistor On the exhaust fan (Thermistor) Overheat protection for lamp inner unit area. The lamp will turn off if thetemperature exceeds the set limit.

L/V thermistor On the prism duct (Thermistor) Overheat protection for light bulb.The lamp will turn off if thetemperature exceeds the set limit.



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2.10.3. SAFETY SWITCH

This is the thermal switch for overheat protection installed on the light guide unit (lamp innerunit area). If overheat condition is caused by the contamination of the exhaust fan, normallythe LAMP thermistor temporarily shuts off the lamp inner unit to protect it from overheat. Thesafety switch is installed, considering the LAMP thermistor trouble in overheat condition.

Figure2-23

A cable with fasteners connects the safety switch and the lamp cover sensor switch. If thetemperature rises above a certain level, the AC power supply is isolated and all regulatingoperations are stopped. (AC power is shut off and this switch runs once, you can not start upthe power, before the temperature decrease to certain degrees.) In this case, you must alsoconsider the thermistor trouble or the MA Board trouble.

2.10.4. THERMISTOR AND TEMPERATURE SENSOR OPERATIONIC700 on the MA Board unit detects the temperature (resistance) with two thermistors in each100ms. Two of thermistors are placed in the main body and mainly detect the temperature ofoptical block area.IC700 judge the following state according to the measurement result then change the fanoperation or shut down the power.

Safety switch


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Temperature detection result are notified to the operation with warning indicator.

Result of condition affect to the fan operations. Refer to the paragraph 2.11 for details.

Refer to the paragraph 2.12 for detail of warning indicator.

(1). LAMP thermistor

LAMP thermistor is mounted with screw with the exhaust fan and detect the temperature oflamp area.To prevent the damage with over heat of lamp inner unit, Power save controller on the MAboard notify the warning with temperature indicator or turns off the ballast power (lamp power)when the temperature exceed predefined level.

(2). L/V thermistorThermistor A is mounted on the prism. When the cooling function is not enough because ofdirt condition with air filter frame consumption and user exchange possibility, Power savecontroller on the MA board on the MA Board it output the warning indication with temperatureindicator or turns off ballast power (lamp power) in order to protect the damage of light valves(LCD panel).

Figure2-24 Thermistor A/LAMP thermistor

Table 2-5 Temperature sensor

Condition Warningindicator

Meaning

Normal temperature Off Operating in the normal condition

Warning temperature flashing in orange Projection will stop if the temperature increase more.

Abnormal temperature Light in red Over heat condition (stop the display)

flashing in red

(2 second intervals)

Malfunction with fan, thermistor, temperature

detection circuit and etc.

L/V thermistorLAMP thermistor

Exhaust fan


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2.11. FAN OPERATION

Four of fan are placed in side of main frame.These fan are used for over-heat protection by exhausting heated air in order to secure thecircuit operation and prevent the defect. (Mainly lamp inner unit, power supply unit B andballast unit are produce the heat)

Figure2-25

Figure2-26

Figure2-27

Lamp fan

Exhaust fan

PBS fan

Intake (L/V) fan


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(1). Control block diagram of fan

Figure2-28

(2). Out Line of function

The four fans are connected by three lead wires. One of these is the signal line which

sends feedback on whether the fans are detected to be running or not.

The two thermistor (L/V thermistor/LAMP thermistor) are connected to the MA board. The

driver CPU controls two fan (Intake fan/Exhaust fan) according the detected temperature

of the thermistor.

IC700 (Driver CPU) on the MA Board always observe the fan operations by monitoring

feed back signals. If the feed back signal condition is different from expected, Controllerjudge as fan abnormal condition then turns on temperature indicator in red and turn off

lamp with ballast power off.

Fan feed back signal is used for monitering the fan operation is correct or not with CPU. If

the feed back signal is not expected, CPU judge as fan trouble and turn on the

temperature indicator in red.

Power supply fan operate with slow or fast according to the FANCL signal which

generate from IC502 (PSCI) on the MA board.

(3). Fan operation

Stand by:

Turn on the fan regulator then drive the intake fan and exhaust fan with slow mode whenthe thermistor detect the over temperature of Slow turn level.

Stop the intake fan and Exhaust fan then shut down the fan regulator when the thermistor

detect the below temperature of Slow turn level.

Lamp on:

Before 0.5 second, start up the intake fan and exhaust fan for lamp on. After the lamp on,

both fan operation are controlled high speed or low speed according to the detection of

the thermistor.

Cool down

The fan continues to operate for 2 minutes after the lamp is turned off.

DAC

M62367

PW

PW164

EV9716C

DACLD LD

DACDI

Synchronous serial bus

AO1

AO2AO8

FANDET

DACCLK

DI

SK

FANON

LVFAN

DRIVER

FRSLV

FRSLMP

FRSPBS

FANON

LMPFAN

DRIVER

FANON

PBSFAN

DRIVER

EXFAN

DRIVER

FANON

FANON

FRSEX


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2.12. LED INDICATOR

Two of indicators are mounted on the MA Board unit and indicate the machine operationstatus. You can see these indication at slit on the upper case unit.

Figure2-29flashing

Table 2-6 LED indicator

ConditionOperation

display indicator

Warning

indicator

During warm-up Green flashing *1 OFF

During lamp on (normal) Green OFF

During cool down Orange flashing *1 OFF

Warning (overheat) Green Orange flashing *1

During power save Orange OFF

Lamp malfunction OFF Red flashing *1

Circuit malfunction,Fan malfunction, Sensor malfunction

OFF Red flashing *2

Overheat OFF Red

Sleep ode Green flashing *2 OFF

*1: Flash 1: The indicator is on for 0.5 sec and off for 0.5 sec.*2: Flash 2: The indicator is on for 1 sec and off for 1 sec.

Warning indicator

Operation

display indicator Warning indicator

Operation

display indicator


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Chapter 3 Disassembly and assembly


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3-2 Rev i s io n :B SE IKO EPSON

3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES

This section explains how to disassemble the EMP-50/51, EMP-70/71. The reassemblyprocedure is the exact reverse of the disassembly procedure.

1. Preparations

(1). Remove any ring, wrist watch, cuff buttons, or other metal accessories that are likely to

get in contact with the equipment.

(2). Wear gloves.(3). Wear a wrist band and ground it. Place a ground mat.

(4). Turn off the main unit and the host computer.

(5). Unplug the power cord from the main unit and service outlet.

(Even if the power is off condition, back-up bias is regulated and supplied to the circuit

board when the power code is connected to the service outlet.)

(6). Disconnect the interface cable from the main unit.

(7). Clean the air filter, interface and case cover with a vacuum cleaner.

2. Required tools and accessories

Prepare the tools and accessories listed in the table below.

3. Limitation of disassembly (Optical engine handling)

The disassembly of the mechanical section is detailed in paragraph 3.2. The optical engine isone replaceable part. When you order the maintenance parts or request our repair service,perform works by the units listed in the table. The optical components listed in the table arerequired the mechanical alignment or electrical correction in the control circuit. (writing theimage adjustment data)

* Do not disassemble the Optical engine.* Do not exchange any unit on the optical engine to the others.* The optical engine and the MA board should be handle as a single set.

Table 3-1

Name Q.t.y Supply Use

(+)Phillips screwdriver 2 1 Market Disassemble the case and interiors

Allen key 1 Market Disassemble the case and interiors

Hex wrench (5mm) 1 Market Removal of computer interface

Tweezers 1 Market Unlock the FPC connector on D.R board

Radio pliers 1 Market Remove L/V thermistor

Brush 1 Market Brush off the dust around fan

Vacuum cleaner 1 Market Clean the fan and filter

Paper wiper Some Market Clean the projection lens

Air blower 1 Market Clean the fan and filter.

Glove 1 Market Avoid finger injury

Wrist band, Ground map 1 Market Avoid electro static influence

Table 3-2

1 Optical head unit These units are specified as Optical engine.

(Treat as one replaceable part in the field

maintenance.)

2 Prism unit

3 Light guide unit


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3-1.Mechanical adjustments for optical engine.

(1). Optical Head Unit

The alignment (height/left and right/concurrent) of the polarization plates (include R/G/B lightvalves) is applied in the factory. If the alignment is modified, clear color image will not bemade, because of the color divergence.

! Caution:Do not apply any mechanical stress to the polarization plate, and also not loosen the screws.

(2). Prism Unit

To synthesize the light output from each polarization plate (include R/G/B light valves), thealignment (concurrent to the polarization plate) of the prism unit is applied in our factory. If thealignment is modified, clear image will not be made, because of the pixel divergence to R/G/Bsynthesizing and projection lens unit, being out of focus and color uniformity.

! Caution:Do not loosen the prism unit fixing screws.

(3). Light guide unit

The alignment of the light guide unit on the optical head unit is applied (gap and concurrent to

the polarization plate) in our factory. If the alignment is modified, clear image will not be made,because of being out of the brightness uniformity on the display screen (brightness or chromais not uniform on the screen.)In consideration of the alignment of the lens array and the mirrors, and also theircombinations, the factory setting is applied to the light guide unit to support the best displayperformance. (If the alignment is modified or the location is changed, there comes distortionon the display screen, therefore clear image will not be made.)

! Caution:Do not disassemble the light guide unit. If you remove the upper guide cover from the unit, the

alignment of lenses or mirrors may be unintentionally changed and also dust may stick to the

unit.

Since EMP-50/50.EMP-70/71 requires very precise adjustment, it can not be adjusted in thefield.

(4). Electrical corrections (MA Board Assy)

The optical mechanism contains mechanical parts which require adjustment as describedabove. There are also some individual differences for the control circuit (MA board) with itemssuch as the output driver for the display signal, and some individual differences in the opticalmechanism (such as the light valves) itself. In order to obtain the optimum display, theseelectrical and mechanical differences need to be eliminated, rather than making mechanicaladjustments, and so a variety of correction values are written into the ROM at the time ofshipment from the factory. Accordingly, the optical mechanism (consisting of the optical head,light guide unit, prism unit and projection lens unit) is designed as a single set (the optical

engine).


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At the factory shipment, following correction data are stored in the Flash ROM on the MABoard Assy according to the specified optical engine.

Gamma adjustment data

Flicker adjustment data

Ghost contrast adjustment data

Sub contrast adjustment data

Color unevenness correction data

*For the writing correction values, an expensive, special device and also skillful engineer are

necessary, therefore it can not adjust in the field.

3-2.Caution for field maintenanceObserve the following procedure, when you repair. Otherwise, display quality is notguaranteed, and also EPSON repair service is not available.

1. Do not disassemble the block. (Do not loosen any screws.)

2. If any of the optical engine components are defective, replace the whole optical engine as a

single unit. And when you send back them to us for repair, send back them in set (by optical

engine).

3. The optical engine components are treated as a single unit, and thus the individual

components which make up this unit should never be installed as single components. (For

example, the prism unit must never be used by itself as a replacement for another prismunit.)

4. Precautions

Precautions given to the individual assembly and disassembly procedures. Read themcarefully before starting the assembly or disassembly procedure. A set of general precautionsare given below.

As you disassemble the main unit, dust that is sticked to the internal fans and air filters is

likely to migrate and contaminate the light valves R, G, and B which are the heart of the

display mechanism, thus deteriorating the display quality.

Accordingly, before reassembling, check the dust inside of the main unit and, if necessary,

clean them with a vacuum cleaner.

The light valves R, G, and B and circuit board assemblies are highly sensitive to static

electricity. When you remove a optical engine or circuit board, place it in an antistatic bag

immediately.

When you perform the assembly or disassembly operations listed below, check the

pertinent unit and its surfaces for any dirt before reinstalling them. If the unit is found dirty,

clean it.

1. Removing the optical engine.

2. Removing the lamp inner housing.

The speaker unit incorporates a permanent magnet. Keep it away from electromagnetic

media such as floppy disks and magnetic cards.

Handle the optical engine (projection lens and light guide units) with care as they arehighly susceptible to vibration and shock.

Do not try to disassemble any part (ex.power supply unit) that is not covered in this

manual.


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3.2. DISASSEMBLING THE MAIN UNIT

The flowchart for disassembling the main unit is shown below.You can take samedisassembling procedure for EMP-50/51, 70/71. Since you can reassemble the dismantledparts in the reverse order of disassembly, unless specifically specified, this manual notcontains reassembly procedure. Detailed descriptions of the disassembly procedures aregiven in Subsections

Do not disassemble the optical engine.

Figure3-1

Lamp inner housing

(3.2.1)

Upper case unit

(3.2.3)

Front case unit

(3.2.2)

Speaker

(3.2.4)

Safety switch

(3.2.5)

LAMP thermistor

(3.2.6)

Projection lens

(3.2.13)

Lamp fan fixing plate

(3.2.10)

Ballast unit

(3.2.16)

Focus ring

(3.2.12)

Exhaust fan

(3.2.17)


(3.2.18)

Power supply unit

(3.2.19)

Lamp fan

(3.2.7)

MA board assy

(3.2.8)

IF board assy

(3.2.9)

Optical engine

(3.2.11)

PBS fan

(3.2.14)

IF board

(3.2.9)

IF fixing plate

(3.2.9)

Ballast duct unit

(3.2.14)

Intake (L/V) fan duct

(3.2.15)

Lamp fan duct

(3.2.10)

Lower case

(3.2.20)

Rear foot

(3.2.20)

Foot unit

(3.2.20)

Intake (L/V) fan

(3.2.15)


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3.2.1. Removing the Lamp Inner Housing

Warning:The lamp unit is very hot immediately after it is in use and may cause injury with heatif you handle it carelessly. Before removing the lamp unit, make sure the temperatureof the lamp inner housing unit has cooled down.

1. Move the two tabs on the lamp cover in the direction of the arrow, and then remove the

lamp cover.

2. Loosen two lamp inner housing fixing screws.3. Take out the lamp inner housing.

Figure3-2

Figure3-3

! Caution: The lamp inner unit is very hot immediately after lamp is used, therefore pay attention to unit.

Take care not to touch with a hand and make dirty the lamps clear glass surface.

Tab

Tab

Lamp cover

Lamp innerhousing

Screws


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3.2.2. Removing the Front Case Unit

1. Remove the lens cover from the projection lens. (Leave the strap attached to the front case

unit.)

2. Remove the six screws(C.B.A SCREW3x5-4/H.F SCREW3x8-2) which are securing the

front case unit, and then remove the front case unit. (Use a 2 mm Allen key to remove the

special screws at the front.)

3. Hold both sides of the front case unit and pull it forward to remove it from the projector.

Figure3-4

When installing the front case, take the following order.1) Clean off any dust which is adhering to the RC receptor window and the photosensor on

the front case unit.2) Secure the front case unit with the two special screws and the four other screws.

Figure3-5

Lens cover

Front case unit

RC receptor window

RC photosensor


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3.2.3. Removing the Upper Case Unit

1. Remove six screws(C.B.A SCREW3x5-4/C.B.A SCREW 3x8-1/C.P SCREW 3x6-1).

Figure3-6

2. Pull up the upper case unit about 5cm, and remove it.(Make sure two cables are connected

to the upper case.)

Figure3-7

! Caution:Keep in mind that it is easy to lose a zoom key-top.

Upper case unit

Upper case unit

Cable

Cable

ZoomKey-top


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3. Unlock the CN501 connector on the MA board, and then take out the operation panel cable.

4. Pull out the speaker cable from the CN800 on the MA board assy.

Figure3-8

3.2.4. Removing the Speaker

1. Remove the two screws(C.C.P-tite.SCREW.3x5) which are securing the speaker, and then

remove the speaker.

Figure3-9

! Caution:The speaker unit incorporates a permanent magnet. Keep it away from electromagnetic

media such as floppy disks and magnetic cards.

Explored view of CN501

Lock

Unlock

Operationpanel cable

Speaker

cable

CN501CN800

Speaker


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3-10 Rev i s i o n :B SE IKO EPSON

3.2.5. Removing the Safety switch

1. Disconnect two of the fast-on tab terminal cables from the safety switch.

2. Remove a fixing screws(C.B.P-tite.SCREW.3x8) from the safety switch and detach the

safety switch.

Figure3-10

3.2.6. Removing the LAMP Thermistor

1. Disconnect the LAMP thermistor cable from the CN1004 on the MA board assy.

2. Remove the nylon rivet (which is securing the exhaust fan), and then take out the lamp

thermistor.

Figure3-11

Safety switch

Fast-on tab cables

LAMP thermistor

Exhaust fan

Nylon rivet


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3.2.7. Removing the Lamp Fan

1. Disconnect the cable from the CN1005 connector on the MA board.

2. Remove the two screws(C.B.SCREW.3x15) which are securing the lamp fan, and then

remove the lamp fan.

Figure3-12 Figure3-13

! Caution:When installing the lamp fan, remove the dust sticking to the fan.

3.2.8. Removing the MA Board Assy

1. Unlock the following light valve R/G/B cable connector.

Figure3-14

Lamp fan

CN1005

Connector Lock

Connector Lock

Connector Lock

Lock state Unlock state (Pulling up the black area)

FPC cable

connector lock

FPC cable

connector lock


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2. Remove three light valve cables and the other cable connectors on the MA Board Assy (6

connectors).

3. Remove the two screws(H.H(O).SCREW.4-40) which are securing the computer video

input connector. (Use a 5 mm hexagonal nut.)

4. Disconnect the DC power cable from the CN1100 connector on the MA board.

5. Remove the six screws(C.P.(O).SCREW.3x5) which are securing the MA board, and then

remove the MA board. (These screws are also securing the earth plate.)

Figure3-15

Figure3-16

Screws

CN300

CN1002

MA board assy

CN1102

CN500

CN1101

Screws

CN1000

(FPC cable)

Computer video

Screws

input connector

CN1100 DC power supply cable connector


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3.2.9. Removing the IF Board Assembly/IF Fixing Plate

1. Remove the three screws(C.P.(O).SCREW.3x5), and then remove the IF board assembly.

2. Remove the four screws(C.P.(O).SCREW.3x5-2/C.B.P-tite.SCREW.3x8-2) which are

securing the IF board.

3. Separate the IF board assembly and the IF fixing plate.

Figure3-17

3.2.10. Removing the Shield plate RE/Lamp fan duct

1. Remove the tow screws(C.P.(O).SCREW.3x5), and then remove the Shield plate RE and

Conductive spring Low-Up.

2. Lamp fan duct is extracted from the Shield plate RE.

Figure3-18

IF fixing plate

IF board assembly

Lamp fan dukt

Shield plate RE


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3.2.11. Removing the Optical engine

1. Remove the two screw(C.C.P-tite.SCREW 3x8) which are securing the ballast power

supply connector, and then remove the connector.

2. Remove the four screws(C.P.SCREW.3x8) which are securing the optical engine.

3. Lift the optical engine straight up to remove it.

Figure3-19

Figure3-20

Ballast power

supply connector

Screw

ScrewOptical engine

Screw

Screw


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! Caution:When installing the Ballast power connector, Refer to Figure3-21 and confirm to set correctly.

Figure3-21

Outside(Side of Ballat unit)

Inside(Side of Optical engine)

Ballast power supply connctorBottom side view


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3.2.12. Removing the Focus ring

1. Remove the three screws(C.P.B-tite.SCREW.2x5) fixing the Focus ring, then remove the

Focus ring.

Figure3-22

3.2.13. Removing the Projection Lens

1. Remove the three screws(C.P.SCREW.3x8) which are securing the projection lens unit,

and then remove the projection lens from the optical engine.

Figure3-23

Focus ring

Optical engineProjection lens


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3.2.14. Removing the PBS fan/Ballast duct unit

1. Remove the two screws, and then remove the PBS fan and Ballast duct unit from the optical

engine.

2. Disconnect the lead wire which is attached to the optical engine with tape.

Figure3-24

3.2.15. Removing the Intake (L/V) fan

1. Remove the two screws(C.B.A.SCREW.3x5), and then remove the Intake (L/V) fan duct.

2. Remove the two screws(C.P.(S-P1)SCREW.3x28), and then remove the Intake (L/V) fan.

Figure3-25

PBS fan

Ballast duct duct

Tape

Intake (L/V) fan duct

Intake (L/V) fan


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3.2.16. Removing the Ballast unit

1. Disconnect the power supply unit cable from the CP1 connector.

2. Remove the two screws(C.P.(O).SCREW.3x5) which are securing the ballast unit.

Figure3-26

3.2.17. Removing the Exhasut fan

1. Remove the two screws(C.C.SCREW.3x8) and then remove the exhaust fan.

Figure3-27

CP1

Ballast unit

Power supply unit

Power supply unit cableBallast unit

Exhaust fan

Ballast unit

Fan guard


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3.2.18. Removing the Lamp Cover Detection Switch

1. Remove the screw(C.P.(S-P1)SCREW2.3x10), and then remove the Lamp Cover Detection

Switch.

Figure3-28

3.2.19. Removing the Power Supply Unit

1. Remove the screw(C.P.(O)SCREW.3x5), and then remove the power supply unit.

Figure3-29

Lamp cover detection switch

Ballast umit

Power supply unit


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3.2.20. Removing the Foot unit/Rear foot

1. Remove the screw(C.P.SCREW.3x18), and then remove the foot cover, foot unit from the

lower case unit.

2. Press the six tabs in the direction of the arrow to remove the rear foot from the lower case

unit.

Figure3-30

Figure3-31

Foot unit

Foot cover

Foot cover

Foot unit

Tab

Rear foot

Tab


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Chapter 4 Troubleshooting


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4-2 Rev is io n :B SE IKO EPSON

4.1. BEFORE STARTING TROUBLESHOOTING PROCEDURES

1. Whenever you replace a unit or block for maintenance purposes, double-check the

replaced unit or block is defective (to determine whether the problem was due to a poor

cable connection).

2. If you find any confirmations while examining the flowchart, be sure to check those items

according to the troubleshooting procedure.

3. Refer to the instructions given in Chapter 3, Disassembly and Assembly, when replacing acomponent.

4. Before making a functional check, be sure to secure the proper connection.

4.1.1. Tools and Accessories Required for Troubleshooting

The tools and accessories re

Documents

Service Manual Epson EMP 50 51 EMP 70 71