service manual epson emp 50 51 emp 70 71
DESCRIPTION
Service Manual for projectorsEpson Powerlite 50cEpson Powerlite 51cEpson Powerlite 70Epson Powerlite 71TM-EMP50/70TM-EMP50TM-EMP70TRANSCRIPT
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SERVICE MANUAL
Mult i Media Projector
EMP-50/51(SVGA)
EMP-70/71(XGA)
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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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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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1.1. 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). 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.
Lamp Cover Detection Switch
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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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3.1. 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)
Lamp Cover Detection Switch
(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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3.2.5. 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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4.1. 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