EMP-7700 Service Manual

EMP-7700

Data Projector

EMP-7700

Revision:A SEIKO EPSON

EMP-7700

Chapter 1 Product general

1.1. PRODUCT GENERAL ............................................................................ 1-21.2. PART NAME ........................................................................................... 1-3

1.2.1. Outside View of Main Frame ........................................................... 1-31.2.2. Inside view of main frame................................................................ 1-61.2.3. Outside View of Remote Controller ................................................. 1-7

1.3. SPECIFICATIONS .................................................................................. 1-81.3.1. Main unit specifications ................................................................... 1-81.3.2. Accessory specification ................................................................... 1-9

1.4. INTERFACE SPECIFICATION ............................................................. 1-111.4.1. Computer 1 Analog (The picture input of analogue RGB from Computer)...................... 1-111.4.2. Computer 1 Digital (Digital RGB video input from computer) interface.......................... 1-121.4.3. Audio 1 (The voice input from computer) ...................................... 1-131.4.4. Audio Out ...................................................................................... 1-131.4.5. Monitor Out.................................................................................... 1-131.4.6. S-Video.......................................................................................... 1-131.4.7. Video In / Audio L/R ...................................................................... 1-141.4.8. Mouse / Com 1/2 ........................................................................... 1-141.4.9. Remote.......................................................................................... 1-151.4.10. Control (RS-232C)....................................................................... 1-15

Chapter 2 Theory of operation

2.1. Hardware Configulation .......................................................................... 2-22.1.1. Process Outline ............................................................................... 2-32.1.2. Electrical System............................................................................. 2-42.1.3. Optical System Connections (Optical Engine) ................................ 2-4

2.2. Safety switch.......................................................................................... 2-62.3. Power Supply Unit .................................................................................. 2-7

2.3.1. Power supply unit circuit block ........................................................ 2-72.4. Ballast unit ............................................................................................ 2-102.5. Main Board Assy Unit ........................................................................... 2-122.6. Driver Board Assy ................................................................................. 2-182.7. IF Units.................................................................................................. 2-212.8. RC Receptor Board Assembly .............................................................. 2-242.9. Speaker Unit ......................................................................................... 2-252.10. Light Guide Unit .................................................................................. 2-262.11. Lamp Inner Housing............................................................................ 2-282.12. Sensor / Switch ................................................................................... 2-32

2.12.1. Lamp cover sensor switch........................................................... 2-332.12.2. Safety Switch............................................................................... 2-342.12.3. Thermistor and temperature sensor operation ............................ 2-34

2.13. Fan Operation ..................................................................................... 2-362.14. LED indicator ...................................................................................... 2-392.15. Operation Panel (Upper Case Unit) .................................................... 2-40

1SEIKO EPSON Revision:A

EMP-7700

Chapter 3 Disassembly and assembly

3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES .............................. 3-23.2. DISASSEMBLING THE MAIN UNIT ....................................................... 3-5

3.2.1. Disassembly flow chart.................................................................... 3-53.2.2. Lamp Cover Unit ............................................................................. 3-63.2.3. Lamp Inner Housing ........................................................................ 3-73.2.4. Upper Case Unit.............................................................................. 3-83.2.5. Main Board Assembly Unit / Speaker Unit ...................................... 3-93.2.6. Front Case..................................................................................... 3-103.2.7. Middle case L unit ......................................................................... 3-103.2.8. Middle case L2 unit ....................................................................... 3-113.2.9. IF unit/Ballast unit.......................................................................... 3-123.2.10. Thermistor LAMP ........................................................................ 3-143.2.11. Safety Switch............................................................................... 3-143.2.12. Optical Engine ............................................................................. 3-153.2.13. Auxiliary Duct Unit / Lamp Fan Unit ............................................ 3-153.2.14. Intake Fan/Exhaust Fan .............................................................. 3-163.2.15. Projection Lens assembly ........................................................... 3-173.2.16. Replacing the attachment lens .................................................... 3-183.2.17. Middle case R unit....................................................................... 3-193.2.18. Exhaust duct unit......................................................................... 3-203.2.19. Power supply unit ........................................................................ 3-203.2.20. Lower case unit ........................................................................... 3-213.2.21. Foot unit ...................................................................................... 3-21

Chapter 4 Troubleshooting

4.1. Before Starting Troubleshooting Procedures.......................................... 4-24.1.1. Tools and Accessories Required for Troubleshooting..................... 4-24.1.2. Field Replacement Parts ................................................................. 4-2

4.2. Entry........................................................................................................ 4-3

2Revision:A SEIKO EPSON

EMP-7700

INTRODUCTIONThis Service Manual contains hardware information which is necessary for smooth field ser-vicing of the ELP-7700 XGA data projector. Information on main technological changes areprovided in the Technical Information releases, and so you should use them to update thismanual periodically.

HOW TO USE THE SERVICE MANUALSince the service manual describes the topics which may be required in the field mainte-nance, you may utilize this for repair or diagnosis of failures. The contents are as following.Before you start the maintenance service, read every safety precautions and observe safetyprecautions and observe safety rules.

VCCI RADIO FREQUENCY INTERFERENCE SELF RESTRICTIONThis product is the type 1 information equipment and uses radio frequency energy and fullycomplies with the limits for the specifications in the computer information equipment radiointerference regulation (VCCI rules). If not installed and used properly manufacturer's instruc-tions, may cause interference to radio and television reception.

TRADEMARKIBM and DOS/V are the trademark or the registered trademark of International BusinessMachines Corporation.Macintosh and Power Book are the registered trademarks of Apple Computer Inc.Windows is the trademark of Microsoft Corporation.EPSON 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 afterthe date of publication. In case of any mistake or lack of description, please kindly notifyus to correct.

4.Any influence by utilizing the document may be out of our responsibility regardless theitem 3 above.

2000 SEIKO EPSON CORPORATION

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

UNITS, etc...)chapter 3 : DISASSEMBLE & ASSEMBLE (DISASSEMBLY PROCESS FOR MAIN UNIT)chapter 4 : TROUBLE SHOOTINGPARTS LIST, EXPLODED DIAGRAM

0-1SEIKO EPSON Revision:A

EMP-7700

Record of Revisions

Memo RandomFree area to memorize any important technical information here.

History Issued Date AlternationREV.A 2000.9.1REV.B 2000.10.18

0-2Revision:A SEIKO EPSON

EMP-7700

PRECAUTIONS

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 and remove theelectric power cable from the electrical outlet.* Whenever inevitably turning the power on to the product opening the case or cover (repairprocess) be sure to take off any metallic materials such as a watch, cuffs, rings, and tie pinswhich may touch the metallic part of the product and dangerous of electric shock.

(2). PROTECTION FROM ACCIDENTAL INJURYOBSTACLES* Be sure not to touch the lamp inner housing and its circumstances after the power is turnedoff, they may be heated up even after the cooling down process was ended. Also make surenot to touch the fan during the operation of repair as turning the power on.* Make sure to protect your hands by gloves from sharp edges during assembly and disas-sembly.* Do not look into the 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 preventthe device or parts from being dropped. Be careful not to place tools and parts on the deviceor at your feet.* Whenever doing any repair work on the product, be sure to away from a place for foreignercome across in order to prevent the product from being used in incomplete condition or acci-dental near miss. Be sure not to leave the product during any repair work.* Be sure to use attached power cable when you supply the power to the product.

2. SAFETY MAINTENANCE(1). ELECTROSTATIC DISCHARGE* Whenever doing any repair work on the product, be sure to wear the wrist band and the elec-trostatic mat with grounding. When replacing any electric components (Boards and Opticalengine), it is recommended to touch the electrostatic plastic bag of the component to themetallic part of the product once before take the component out from the plastic bag.

(2). LIMITATION OF PARTS* Use only authorized or supplied parts from EPSON for the replacement of mechanical parts including the lamp inner housing, air filter and so on.* Use only the power cable and the interface cables attached with the product.

(3). 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 theconnectors until it stack to the connector edge.* When remove the FPC cable be sure to remove the connector lock in advance. Whenremove the cable on the CN/003/1800 of the Main board assembly unit or CN700~702 of theDriver Board Assy, the connector lock should be unlocked by pulling up the both end of con-nector lock simultaneously with tweezers.* Whenever doing removal of parts or repair work on the product, make sure that the work isdone in a clean room, free of dust and dirt in order to keep the optical element away from dirt.

3. OTHERS*The hardware of the RS-042UG is basically the same as that of the RS-042 except somecomponents. Consequently, this manual basically describes the hardware of the RS-042. Dif-ferences between these two units are explained in this manual as comments.* Any questions on the EMP-9000/8000LCP maintenance including supply of the service parts


EMP-7700

or contents of the document would like to be contacted to the below address. Any technicalinformation about amendments is occasionally available as the service bulletin.

SEIKO EPSON CORPORATION4897 SHIMAUCHI, MATSUMOTO-SHI, NAGANO-KEN 390-8640 JAPANATTN: Visual Device Customer Support Group


Chapter 1 Product general

EMP-7700

1.1. PRODUCT GENERAL

EMP-7700 MULTIMEDIA PROJECTOR designed as the new model of projector is the brightly with new optical engine to project enhanced color images from the personal computers CRT and any one of video equipment such as video tape deck, video cam-

corders or digital camera.

FEATURE OF EMP-7700• Bright and clear Flexible projection image size

The big caliber zoom lens, and the new type of high brightness lamp (class No.1) and the opticalblock(220W uHra high efficiency lamp) enable to achieve a wide projection image from 30" to300" (projection distance : 1.07 to 11.35 m).

• EMP-7700 : 3000ANSI lm• High resolution full color (16770 thousands colors)

EMP-7700(XGA): 3(R,G.and) of TN liguid crystal panels of 786.432 pixel supply approximatly2.3 million (1024x768x3) dots.

• The signal to VGA~UXGA is able to be projected full screen with the adoption of Epsonoriginal image compression technology DAR (Digital Active Resizing).

• Standard attachment of remote controller The projector can be controlled using a handheld remote control unit, with menus being providedfor Image source switching and Image adjustment. The remote control can also be used as a wire-less mouse to control mouse operations on the computer screen during presentations. The EMPLINK áV software that combines as a standard accessory of product.

• Connectivity with various computersThe advanced data signal determination function Standard attachments of interface cables andadapters enables EMP-7700 to connect with various computers such as IBM-compatible PCs andlaptops, Macintosh. Almost all of the video signals are available for this.

• Keystone collection by digital processing and optical lens shift.Contract a upper /lower part of image with smoothing function. The projector for supporting ofmiscellaneous computer (DOS/V, Mac, PC98) output. No matter what type of output is used, theresult is video image of outstanding clarity.

• Simple MaintenanceThe maintenance easy. Number of image adjustment process is not required.

• Celing mount (option part)Table 0-1The projector can be fixed to the celing.


EMP-7700

1.2. PART NAME

1.2.1. Outside View of Main Frame

Figure1-1 Front side view

Figure1-2 Operation panel

Remotecontrolreceiver

Foot adjust lever

Front foot

Lens cover

Operation Panel

Lower Case

Upper Case

Menu butonEsc buton

Volume buton

Video buton

Help buton

Power buton

Computer buton

A/V Mute buton

Shift buton

Sync buton

Tracking buton

Resize buton


EMP-7700

Figure1-3 Interface panel

Figure1-4 Main projector unit (left side)

BNC

Monitor Out

Audio Out

Remote

S-Video

Mouse2

Computer1 (Digital)

Mouse1

Audio (Computer1)

L-Audio-R

Computer1 (Analog)

Composite Video

Computer 1 Signal Select switch

Control(RS-232C)

Operation panel

Power inlet


EMP-7700

Figure1-5 Main projector unit (back)

Figure1-6 Main projector unit (right side)

Remote control receiver

Lamp case

Foot Rubber

Handle


EMP-7700

1.2.2. Inside view of main frame

Figure1-7

Projection panel

Switch board

Speaker L Speaker R

Main board assy unitIF unit

Safety switch

Lamp cover sensor switch

RC receptor board assembly

RC receptor

Thermistor, Lamp


EMP-7700

1.2.3. Outside View of Remote Controller

Figure1-8 Remote controller

(Front) (Back)

Inside of cover


EMP-7700

1.3. SPECIFICATIONS

1.3.1. Main unit specificationsTable 1-1

OPTICAL FEATURES SPECIFICATIONSDisplay method Transparency type poly-silicon TFT color liquid crystal dis-

play (R/G/B three panels)Optical method Dichroic mirror separation and prism combine method Projection image size 28 inch ~ maximum 300 inch (Wide angle),

21 inch ~ 230 inch (Tele angle)Projection distance 1.07m~11.35mLiquid crystal screen /Drive system Poly-cilicon TFT (MLA built in) 1.3inch (Diagonal)

EMP-7700 :Full lines, 12phase block seriesPixels EMP-7700 :786432x3 (1024x768x3)Focal Lens Manual Zoom lens F1.7-2.3 (49~63 mm)Focus adjustment ManualZooming adjustment Manual(1:Approx1.3)/E zom by remote control(1:Approx4)Keystone correction ratio 10(Upper) :0(Lower) ~ 5:5 optical axisLight SourceLife(Lamp inner housing)

discharge lamp A.C. driveUHE (Ultra High Efficiency Lamp) lamp 200W Life 1,500 hours (Light 50% or the survival rate 50%)

Brightness EMP-7700 :3000ANSHmAUDIO FEATURES

Average brightness uniformity Typ.85%Output for internal speaker Dynamic speaker(3W-8Ω) x 2 speaker 3D stereo sound:

50~18000Hz, S/N 85dbAudio out Interface External speaker 3.5mm Stereo mini-jack

Internal speaker output is stopped when mini-jack isplugged.Output signal:0 to 500mvrmsland imperdance:600É¹

Audio interface (L/R) x2(S Video /Video )

Audio signal(stereo) from the video devices. Input interfaceis separated with R(Right) and L(Left).Interface type:RCA jackInput signal:500mvVrms / 47KÉ¹

Audio (Computer 1) Computer 1 Audio input (stereo)Interface type:3.5mm Stereo mini-jackInput signal: 500mVrms/47KÉ¹

Audio 2(L/R) interface

REMOTE CONTROLWireless remote controller For controlling EMP-7700 operating mode and controlling

host computer from EMP-7700. Signal is detected with internal receptor board.Control range: Within 10 m and 30 degree (Left / Right), 15degree (upper /Lower) wide from receptor .

Remote interface For conect to optional remote control receiver (EMPST02)Interface type : 3.5mm Stereo mini-jack(The function of Receptor board is stopped when mini-jack isplugged)

VIDEO INPUT/OUTPUTComputer 1 interface Analog (input) Host computer RGB output

(0.7Vp-p 75Ω/ Mac 0.714Vp-p 75Ω)Computer 1 interface Digital (input)


EMP-7700

1.3.2. Accessory specification

Remote Control• Design Stick type• Dimension 165 x 48 x 35 mm• Weight 70g (except battery) • Number of Button 24 (operating button 22 + mouse button 2)• Pointer Malti-polarized switch methode• Battery Alkaline LR6 <AA> x2• Battery Life Over 3 months (1 hour use per day)• Transmission Directivity Right / Left:±20° Upper / Lower:±20°

Power cord• 3.0m <10ft>.Prepares it with ground for each sales branches.

Computer cable• Mini D-Sub15pin type : 1.8m <6ft>, HDsub-15pin type.• 5 BNC type : 1.8m <6ft>, Conversion from HDsub-15pin to BNC.

Conputer2 RGB/Component video inputinterface (R/cr/Pr, G/Y, B/Cb/Pb, H/CStnc,VSync)

This terminal is work as RGB Video and compornent Videoinput terminal as well, I can switch on OSD menu. (Default:RGB)Input signa :Analog RGB Standard level (0.7Vp-p, 75Ω,Neg-ative synchronous0.3V)Interface Typ :BNC Jack

Monitor OUT interface (output) EMP-7700 RGB outputInterface type: HD-15pin(DDC1/2B correspondence)

S-Video Interface Input signal: Luminous 0.714Vp-p,Chrominous 0.28Vp-p.Interface type: Min-DIN 4pinS-Video is prior to composite video.

Video IN Interface(Composite video interface)

Input signal: 1.0Vp-p,sync.negative 75ΩInterface type: RCA jack (yellow)TV signal type: NTSC carrier frequency :3.58MHz(4.43MHz) PAL carrier frequency :4.43MHz(3.58MHz) SECAM carrier frequency :4.43MHz

Auto identification(Default)MOUSE

Serial MouseUSB MousePS/2 Mouse ADB

Mouse/Com1, Mouse/Com2Auto identification (Mouse)Interface type: DIN 13pinControl RS-232C D-sub9

POWER SUPPLYInput Voltage AC100-120V /220-240V±10% (50/60Hz)Power Consumption Approx. 360 W (Standby :6w)

Conform to energy star program.Dimensions 278 mm (W) x 153 mm (H)x 401 mm (D)

(Include lens and foot)Weight Approx. 6.9 kg

Mechanical FunctionFoot Adjuster Quick-release and fine adjustment machanism.Tilt Angle 0°~+12°Theft-proof Arranges holds to install “Kensington Lock“ on lower case.Nut for celling For of muts are prepaired onthe Bottom case to fix a product

to celling.ENVIRONMENT

Operational/storage temperature +5°C~+40°C / -10°C~ +60°C (non condensing)Operational/storage humidity 20%~ 80% / 10%~ 90% (non condensing)Operational/storage Altitude 3048m / 6096m

Table 1-1


EMP-7700

Audio cable• 1.8m <6ft>, 3.5mm stereo mini type.

Video/Audio cable• 1.8m <6ft>, RCA plug type, 3cables.(yellow) 1cable• 1.8m <6ft>, RCA plug type, 3cables.(red,white) 2cable

Mouse cable set• PS/2 Mouse cable set,1.8M<6FT>, Mini DIN 10pin - Mini DIN 6pin, x1• USB Mouse cable set,1.8M<6FT>, Mini DIN 10pin - USB 4pin, x1

Battery• Simple 3 Alkaline LR6 <AA> x2.


EMP-7700

1.4. INTERFACE SPECIFICATION

Figure1-9

1.4.1. Computer 1 Analog (The picture input of analogue RGB from Computer)

HD D-SUB 15

Pin Terminal Pin Terminal1 Red video 9(None) (Pin is not exist)2 Green video 10 Synchronous GND3 Blue video 11 Monitor (ID bit 0)4 Monitor (ID bit 2) 12 SDA5 GND 13 Horizontal synchronization6 Red video GND 14 Vertical synchronization7 Green video GND 15 SCL8 Blue video GND

156101115


EMP-7700

1.4.2. Computer 1 Digital (Digital RGB video input from computer) interface

Pin Terminal Pin Terminal1 Data 2- 13 Reserved2 Data 2+ 14 +5V Power3 GND 15 GND4 Reserved 16 Hot Plug Det5 Reserved 17 Data 0-6 DDC Clock 18 Data 0+7 DDC Data 19 GND8 No Connect 20 Reserved9 Data 1- 21 Reserved10 Data 1+ 22 GND11 GND 23 Clock+12 Reserved 24 Clock-

811692417


EMP-7700

1.4.3. Audio 1 (The voice input from computer)

3.5mm Stereo mini jack

1.4.4. Audio Out

3.5mm Stereo mini jack

1.4.5. Monitor Out

1.4.6. S-Video

S-terminal inputMini DIN 4-pin

Pin Signal Function Pin Signal Function1 R Out Red video 9 Reserved2 G Out Green video 10 GND3 B Out Blue video 11 Reserved4 Reserved 12 Reserved5 GND 13 H sync Horizontal sync.6 GND 14 V sync Vertial sync.7 GND 15 V sync8 GND

？

？

？

？

？

？

？

？

？

654327891

1 pin: GND2 pin: Computer audio input L3 pin: Computer audio input RThe other pins: NC

？？？？

？？？？

？？？？

？？？？

？？？？

？？？？

？？？？

？？？？

？？？？

1,6~9 pin: GND2 pin: Audio output L 3 pin: Audio output R5 pin: Detection of Line-out jack insertion The other pins: NC

156101115

4

2

3

1

56

1,2,6 pin: GND3 pin: Y signal input4 pin: C signal input5 pin: Input detection terminal


EMP-7700

1.4.7. Video In / Audio L/R

RCA Gold plating (only insertion part), Light angle H=15mm, Color: yellow

1.4.8. Mouse / Com 1/2

Multi-mouse jack10-pin jack

Signal meanings are different according to the operation mode.

2

1

3

5

4

Video in

6

8

7

Audio R

Audio L

1 pin: GND2 pin: Video input3 pin: GND4 pin: Audio R return 5 pin: Audio input L6 pin: GND7 pin: Audio L return 8 pin: Audio input R

4

21

7

3

6

5

8

9 10

PS/2Mouse

USBMouse

ADBMouse

SerialMouse

Serial(Cross)Mouse

Pin

ReservedGNDReservedReservedReservedGNDReservedReservedDATACLK

ReservedGNDD-D+ReservedReservedReservedReservedReservedReserved

+5VGNDReservedReservedGNDReservedReservedReservedReservedADB

DTRGNDReservedReservedGNDGNDRTSRDReservedReserved

ReservedTDRDDSRGNDDTRReservedReservedReservedReserved


EMP-7700

1.4.9. Remote

3.5mm Stereo mini-jack

1.4.10. Control (RS-232C)

654327891

1,6 pin: GND2 pin: Repeater detection / Signal 5 pin: LED lanp

1569

PIN Signal

1 CD

2 RD(Received data)3 TD(Transmitted data)4 DTR

5 GND6 DSR7 RTS(Request to send)

8 CTS(Clear to send)9 RI


EMP-7700


Chapter 2 Theory of operation

EMP-7700

2.1. Hardware Configulation

The hardware of EMP-7700 is distinguished in the optical system and the electrical system.The lower level beyond the breaking line in the Figure2-1 show the optical system, and theupper level shows the electrical system. (Dotted line inside is the optical system.)

Figure2-1 Hardware block diagram


EMP-7700

2.1.1. Process Outline

1. The video signal is provided to the main board Assy uniy from the IF unit. (Analog signalshould be once changed into digital signal by the Main board Assy uint.)

2. Video signal (digital) is once stored in the video memory (SRAM) on the Main board Assyunit, then the Driver board Assy 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 thelights from the light guide unit.

4. The lights transmitted through the light valves will be combined the prism and projectedthrough the projection lens unit.

5. The audio signal is sent from the IF unit to the AU block of the main board assembly and isoutput from the right and left speakers.

Circut process block

Figure2-2

Optical Process block

Figure2-3

Main board Assy unit

Digital

Analog

A/D

DisplayMemory

Display control

IF unit

Display

Speaker R

Speaker L

Driver board Assembly

Display

LCDConverter

Driver

R

G

B

Light ValvesR/G/B

signal

Audiosignal

AU block

Correction

Projection LensLight Valves R

Light Valves G

Light Valves B

Lamp inner Housing

(Light Source)

Balast Unit

Driver board Assy

Prism (R/G/B sinthesize)


EMP-7700

2.1.2. Electrical System

Electrical units of EMP-7700 are physically connected mainly to the Main board Assy unit asshown figure 2-1. The function outline of each circuit system unit is shown below table.

2.1.3. Optical System Connections (Optical Engine)

The optical systems consists of 5 blocks (Intake fan, Exhaust fan,Light guide unit, Opticalhead (Light valve R/G/B)/Prism unit, and Projection lens unit) as shown next page. Theseunits and Driver board Assy are specified as Optical engine and it is one replaceable part.

Figure2-4 Optical block

Unit name function outline1. Main board Assy unit Power (DC voltage generation) ON/OFF, The ballast power

supply (for light source lamp) On/Off, Circuit reset, Air cool-ing fan control, The temperature detection (protect overheatcondition), Store the display data, The display control (resiz-ing etc.), Display data and timing signals generation, condi-tion lamp (LED indicator) display, Audio signal control,Remote controller /operation panel control, Mouse control,Relay the DC power supply hook up, PC interface connector,Audio control

2. Driver-board Assy (optical engine)

Display compensation data preservation, Read out the dis-play data, Digital to analog coversion (D/A), Light valve (liq-uid crystal panel) drive signal generation, Bias generation forthe light valve

3. IF unit Display data input/output, Interface connector, Audio input/output interface connector, BNC interface connector, Mouse/Com interface connector.

4. RC receptor board Assembly (The front/the back)

Infrared ray signal receiving of the remote controller, Serialdata transmission

5. Operation panel Switch (the matrix) signal generation

Optical Head/Prism unit

Lamp inner Housing installing location

Projection Lens Unit


EMP-7700

Inside view of light guide unit

Figure2-5 Inside of light guide unit

Lamp inner housing Projection lens unit

Figure2-6 Figure2-7


EMP-7700

! Caution:Take care not to cause any shock or mechanical stress to the optical engine and also not todisassemble it. Otherwise, the pixel divergence may occur. The alignment adjustment for each other is applied in the factory, and also electrical correctionis applied with Driver board Assy according to the each optical engine. Therefor do not sepa-rate or exchange the each unit to the others.

! Caution:The intake fan,light guide unit,optical head,prism unit,projection lens unit and driver boardassembly are treated as a single unit which is termed the optical engine.(The parts other thanthe intake fan and the projection lens unit are not designated as serviceable parts.The opticalengine should be serviced as a single unit.)

2.2. Safety switch

The safety switch is a thermal switch which isolates the power supply in the event of overheat-ing.

Figure2-8

The safety switch (thermistor) is installed to the lamp inner housing (lamp unit mount) of theoptical engine. The safety switch isolates the AC power supply if the temperature rises abovea certain level (to prevent overheating).

Table 2-1Unit functionUNIT NAME FUNCTION & REMARKS

LAMP INNER HOUSING(Type :ELPLP12)

Include one Discharge Lamp (UHE 200W)as a light source.FUSE board is mounted for new lamp UNIT detection.

Optical engine• Light guide unit• Optical head unit

The light guide unit disperses the light from the light source via a multi-lens in order to provide uniform illumination. In addition, an UV filter removes any harmful ultraviolet light from the LCD. After this light is polarized, it is then split into R/G/B3 spectrums.The optical head unit consists of three light valves and a prism unit. Each light valve controls the pixel shutter in 256 steps. The prism unit synthesizes the R/G/B signals and sends them to the projector lens unit.

PROJECTION LENS UNIT

Manual zooming and focus adjustment, the image is projected.

Safety switch(The N/C type)

: Overheat condition is presented around the lamp inner housing area,it shutdown the AC power.

Safety Switch


EMP-7700

2.3. Power Supply Unit

The power supply unit function is divided by 2, one is from the EMI filter circuit to the subpower supply (Primary) and another is the main power supply (Secondary). The sub powersupply is actuated always, nonexistent the relation to the power ON/OFF. The main powersupply department actuation is contorolled by the power supply control signal (PWON) that isoutput from the main board Assy unit.

Figure2-9

2.3.1. Power supply unit circuit block

This is a unit which consists of the EMI filter circuit, safety circuit (thermostat), power supplycooling fan sub power supply circuit and smoothing/control block.

Figure2-10

Power Supply connector for Ballast

DC Output/Input cable(connected to Main board Assy unit)

AC input Connector

Power Supply Fan


EMP-7700

(1). Outline of function• AC input circuit department: Include AC input connector, thermostat and EMI filter circuit.

The AC voltage is supplied via the filter unit and safety switch, when the power cable isconnected.

• Safety circuit department: Include the thermostat on the AC input circuit. The thermostatcut off the AC power when it becomes overheat condition.

• Ballast power supply circuit department: It is the circuit that generates the power supply(DC300~400V) for the lamp inner housing according to the power ON/OFF control signalof the main board Assy unit. The output cable is connected to the ballast unit.

• The primary regulator circuit: The DC voltage is generated by rectifying and stabilizing theAC power supply. This DC voltage are supplied to the sub power supply circuit and ballastpower supply circuit.

• Regulate the DC voltage that is generated with primary regulator circuit with DC-DCswitching regulator then produce the various bios as shown in the next table. This DC-DCswitching circuit has feedback function with +7V output and reducing the fluctuation ofoutput. (Adjustment of individual output voltage is not possible.)

• Power Supply fan: The heat that occurred with the power supply unit is radiated. The fanbios (+12V) is supplied from CN201 of the power supply unit.

• The sub power supply circuit (+3.3R): Always+3.3V be output irrespective of the ON/OFFof the power supply if the AC voltage is supplied. (It is used to the power ON control circuiton the main board Assy unit.)

The circuit power supply output is as next it showed it.

(2). Input / output specification

Table 2-2 AC input (CN103 N/L)

AC Input Rating ToleranceInput voltage AC100~240V AC85~276Vfrequency 50 / 60Hz 48~62Hz


EMP-7700

Figure2-11

Voltage/Signal arrange of DC output (CN201/202/203/204) connector department is shownbelow.

Figure2-12

• DC output (CN201/202/203/204)

Table 2-3 Bllast output

Pin No. Signal name1 HGNT (+) Ballast out put (+)2 BAHV(-) Ballast out put (-)

Pin No.Signal name

Direction Remarks Pin No.Signal name

Direction Remarks

14 +12T Sub power supply 28 +5VT Sub power supply13 +5VT Sub power supply 27 +5VT Sub power supply12 +3.3T Sub power supply 26 GND11 +3.3T Sub power supply 25 GND10 +3.3T Sub power supply 24 GND9 +3.3R Main power supply 23 GND8 +3.3R Main power supply 22 GND7 +3.3R Main power supply 21 GND6 +11 Main power supply 20 GND5 +7 Main power supply 19 GND4 +18 Main power supply 18 GND3 -7 Main power supply 17 GND2 +13 Main power supply 16 GND1 FANCTL Fan control 15 PWON Main power supply ON/OFF

BLKWHT

Ballast Output


EMP-7700

2.4. Ballast unit

it is the unit that regulates again the DC power supply (DC220-410V/0.8A) for the ballast thatis supplied from the power supply unit to generates the AC power supply (AC45-200V) for theUHE lamp.

Figure2-13

Circuit

Figure2-14

(1). Process outline• The sub power supply : The voltage for control circuit (+15V/+20V) inside the ballast unit

is generated. • Switching circuit : Doing the switch actuation for the regulation again according to

the output signal (BACT) of the main board Assy unit. (TheBACT signal is doing the ON/OFF of the ballast output.) Doingthe modification (the adjustment of the output voltage) of theswitching duty according to the feedback signal from the detec-tion circuit.

• Regulator circuit : The voltage for the lamp of AC45~200V is generated.

UHP Lampdriver

Fuse 4 AF

220IFMainsinput

Mainsfilter

gndCB1-3

470 E

CB2-1

ECI-Input Flag-output

4k7+5VCB2-2 CB2-3

10n

CB1-1L1

R1Stabiliser

Control

Lamp

Mains Isolation

Commutator Ignlter L1

L2

Lampoutput

C1

C2

50F

450

V

Pow

er in

put0.5s/a W

4’BYM56


EMP-7700

(2) Input/output specification

• Detection circuit : Monitoring the regulator circuit and genarates the feedback sig-nal of the output voltage stabilization and detects of output cur-rent. When the lamp inner housing becomes consume, the“LPST“ signal is transmitted to the main board Assy unit.

Voltage Rating powerInput 220~410VDC 260W (max)

3W (At the time of the standby)output AC45~200V 220W±4%


EMP-7700

2.5. Main Board Assy Unit

The Main board Assy unit controls the center of the product. It consists of CPU, ROM, (FlashROM / EE-PROM) video memory, display controller, resizing, and circuits for operation panelcontrol, temperature sensor circuit, ballast power supply control receptor board interface con-trol and etc...The Main board Assy unit controls everything except to generate the display signal and audiooutput. The Main board Assy unit is available as a unit for the service parts.,

Outside View and connection of the Main board Assy unit for EMP-9000 are shown below.

Figure2-15


EMP-7700

(1). Main board Assy unit circuit block

Figure2-16 Main board circuit block

Stereo X 2

AUDI

OSe

lect

orAd

dres

s/ D

ata

ET60

60D

EC D

river

Ser

ial D

AC

PC1

Audi

oin

Audi

oou

t

Ste

reo

Ste

reo

Line

Out

SP L

SW B

oard

FAN

1

L/V

CN

PW36

4DDigitizing controll

Frame buffer controll

Resizing controll

Digital- Gamma correction

PC mode detection

Keystone correction

Dig

ital

Chr

oma

SA

A71

14H

L/V

CN

L/V CN

LCD

Driv

eBl

ock

LCD

Driv

eBl

ock

Aud

ioC

ontr

olle

rTD

A74

64

Pow

er A

mp.

TDA

8542

AT

TV A

udio

in

Vide

o SW

Sync

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E2PR

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16K

b

RS-

232C

Driv

er

FAN

2Thermistor

(L/H

)FAN

Driv

erLo

cked

Det

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I2 C

IRR

emot

e 2

Wire

dR

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eIR

Rem

ote

1

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8Mb

MBM

29D

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itsu)

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ave

Lam

p

3.3

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2,12

F,18

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wer

Sup

ply

/Bal

last

Cnt

l

AC In

Bal

last

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ouse

CPU

E2 P

RO

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6Kb

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Driv

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EV99

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AAddress decode

Bus control

I/O port

PDEN control

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ard

MA

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IFBo

ard

PLL/

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ch)

CXA

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30

CONNECTOR

CONNECTOR

CONNECTOR

CONNECTOR

BOARD

BOARD

BOARD

BOARD

PCm

ouse

1

PCm

ouse

2

Rem

ote

INT

Balla

stC

ntl

Lam

pFa

il

映像入力部

Digitizer

Syncronizer

Resizing operation

LED 1

LED 2

RCBo

ard

FUSE

FUSEFUSE

FUSE

BOARD

BOARD

BOARD

BOARD

FRO

M8M

bM

BM29

DL8

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ujits

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IR D

ecod

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12.5MHz

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GB

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RGB

ET70

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EMP-7700

(2). Function outline• Projector control

Controls the driver board, video board and IF (audio) board.• Digitalization of input video signal

Converts the video signals which are input from the PC/video to digital signals.• Conversion of input video signal resolution using a digital filter

Converts the resolution of the video signals which are input from the PC/video by meansof a digital filter.

• Conversion of transmitted IF to digital video signals in accordance with digital video stan-dardsAllows digital video signals which conform to DVI standards to be received.

• Frequency conversion for input video signalsConverts the frequency of video signals which are input from a PC/video to create LCDdrive video signals.

• Display of sub video signal within the main video signal as a PIP (Picture in Picture) imageConverts the resolution of the video sub-carrier signal which is part of the main video sig-nal which is input from the PC/Video and displays it as a PIP image with the size youselect.

• 3D-Y/C separation and digital NR (Noise Reduction) control for video signals (NTSC sig-nals) Applies 3D-Y/C separation and digital NR (Noise Reduction) control to composite videosignals in NTSC format.

• On-screen display functionDisplays menus and ELP links which are contained in the input video signal as overlayimages.

• DDC controlResponds to DDC queries from the connected computer.

• Remote controlReceives and decodes remote control signals and uses these signals to control peripheralcircuits.

• Mouse controlConverts pointer information within the remote control signals into mouse signals for PS/2, ADB, 98 bus and serial mouse signals and sends them to the connected computer.

• Lamp controlControls the ballast and controls the lamp illumination.

• LED controlControls the various power supply, temperature and lamp indicators.

• Cooling controlMeasures the temperature and uses this temperature to control the fan operation.

• Power supply controlControls the power supply in order to reduce power consumption.

• PC serial interface functionUses the RS-232C interface to for projector control, uploading and downloading betweenthe projector and the computer using ESC/VP.

(Digitizer block)• 3D-Y/C separation & digital NR block (both main/sub screens)

*3-dimensional separation of composite video signals in NTSC format into Y signals andC signals*Digital elimination of interference from S terminal (Y/C) video signals in NTSC format(Main device: TC90A28F 3D Y/C Comb Filter [Toshiba])

• Digital chroma decoder block (for PIP sub-screen)Converts composite/Y/C analog video signals in NTSC/PAL/SECAM format into digitalluminance signals (Y, U, V) for displaying in the sub-screen.


EMP-7700

(Main device: SAA7114 Digital Video Decoder [Phillips])• IP conversion block (for PIP sub-screen)

*Conversion of the digital video signal obtained from the digital chroma decoder for dis-playing in the sub-screen.*Resolution conversion for the sub-screen signal.(Main device: gmVLX1A IP converter [GENESIS])

• Analog color difference - RGB conversion block (for main screen)*Converts Y/Cr/Cb and Y/Pr/Pb video signals into analog RGB signals which are HDTVcompatible.*Carries out sharpness, tint, brightness, γ correction, contrast and gain correction.(Main device: TA1316N analog video decoder [Toshiba])

• Analog-digital conversion block (for main screen)*Converts analog RGB video signals from computer (RGB) and video deck (RGB)sources into digital signals (RGB8:8:8) for displaying in the main screen.*Adjusts the brightness and contrast.*Carries out dual line sampling and frame half sampling control.*Includes a PLL function for generating sampling frequencies which correspond to thevarious video signals. (SYNC adjustment)*Enables adjustment of the sampling phase of the sampling frequency. (SYNC adjust-ment)(Main device: CXA3516R Video ADC [Sony])

• DVI converter block (for main screen)*Receives transmitted digital video signals which conform to the DVI standard and con-verts them to digital signals.(Main device: SiL161 DVI converter [SII])

• Sync signal separation block (for computer image signals)Separates the composite syncsignals and sync on-screen signals which are contained in the computer image signalsinto H/V sync signals.(Main device: BA7078AF Sync Separator [ROHM])

• Sync signal separation block (for video deck image signals)*Receives the V/H sync signals, Y/Cr/Cb signals and HDTV-compatible signals whichhave been separated from video image signals and selects the H/V sync signal compo-nent.*Cancels Macrovision-compatible copyguard for sync separation.(Main device: TA1318N Sync Separator [Toshiba])

(Video overlay display block)• Has a built-in frame memory, CPU, assignment control and I/O. Converts the position and

size/resolution of the input digital video signals in real time and overlays them inside theoperating menu display screen.

• Enables digital filtering of the digital image signals which are input as desired by means ofa programmed internal FIR filter (80 or 160 taps).

• Analyzes the frequency characteristics of the digital image signals which are input anddigitally resizes the signals to the desired size.(Example: Digitally enlarges and reduces the video signals with various frequencies andresolutions in NTSC, PAL, SECAM, VGA, SVGA, XGA, SXGA and UXGA formats andconverts them to the LCD resolution.

• Displays the sub-screen inside the main screen as a PIP (Picture in Picture).(Main device: PW364 overlay processor

(Frequency conversion FIFO block)Converts the digital video signals (48 bits) which are output from the video overlay displayto the upper frequency which matches the LCD driver specifications to generate the videosignal.


EMP-7700

(Main device: EV9811AA 48-bit asynchronous FIFO [GAFIFO48: Seiko Epson])

(PC video signal output block)Amplifies and outputs the analog RGB signals which are input from a computer to the PCout terminal.(Main device: AD8185ARU Video Amplifier [ANALOG DEVICES])

(DDC block)Responds to DDC queries from the connected computer.(Main device: 24LCS21T/PCB2421T EEPROM)

(Control block)Performs projector control, remote control unit control, mouse control, cooling control,lamp control, LED control and computer serial interface control.Main devicesMain CPU:MB91101PFV-G-BND-RDecoder IC: EV9807AA

(3). Outline of operation• When the power supply is turned on, the reset signal for the I/O controller (IC1108) on the

main board assembly unit is canceled. The settings for all components are made in accor-dance with the program which is stored in the flash ROM, and the projector changes tostandby mode (waiting for the lamp unit to turn on [project])

• The Computer In input signal (digital) is first converted by the video amplifier circuit into ananalog signal, and then it is converted back into a digital signal by the ADC.

• The Monitor Out output signal is the input signal from the Computer 1 terminal which haspassed through the video amplifier circuit.

• In order to display the picture, the received data is first stored in the frame buffer of theresizing block where it is resized. The resized data is then output to the driver boardassembly along with a synchronizing signal.

• The video input signal (S-Video/Video) is converted into a digital signal by the digitalchroma processor, and is then stored in the frame buffer.

• The I/O controller (IC1108) outputs four scanning signals to represent operations carriedout at the operating panel. When an operating panel switch is pressed, a scanning signalpasses through the switch contact and then passes through the return signal line. The I/Ocontroller controls the operation the various projector components based on the returnsignal. (Example: When the Power switch is pressed, the I/O controller outputs a "BACTA"signal to the ballast power supply [lamp power supply].)

• A +5 V voltage is supplied to the RC receptor board assembly. When the RC receptorboard assembly detects a remote control signal, the data in serial format is received bythe IR decoder (IC1507), and the I/O controller uses this to control the operation of thevarious components. (This is the same as the repeater (Remote) I/F signal (serial format)which is supplied from the IF panel unit.)

• The projector includes a timer circuit which regulates the usage time for the light sourcelamp (the lamp life) and an EEPROM circuit which operate as shown in the table below.

• If the above occurs, the light source lamp needs to be replaced. After replacing the lightsource lamp, press the POWER switch to turn the lamp on. The lamp timer inside theEEPROM will then be reset automatically.

Table 2-4 Lamp inner housing timer controlLamp inner housing Lamp indicator state

when the operating time of the light source lampexceeds 1,400 hours.

The projection screen continues to flash the mes-sage(Exchange Lamp) in red for 30 seconds after it isturned or and the lamp indicator blink in orange.

When the lamp inner housing run out before itís life. The lamp indicator blink in red.


EMP-7700

• The two thermistor circuits (PBS thermistor and LAMP thermistor) detect the temperaturesof the respective parts of the projector. The CPU monitors the thermistor signals onceevery 100 ms, and controls the fan and the power supply lamp based on the temperaturestate.

• There are five temperature sensors which are mounted on the main board assembly inorder to prevent overheating. If the detected temperature rises above a certain level, thetemperature detection circuit applies an interrupt to the CPU, which causes the tempera-ture warning indicator to illuminate, and also changes the fan speed (low speed--highspeed) and stops the supply of ballast power to the light source lamp.

• The mouse interface is provided so that the accessory remote control can be used as awireless remote control for a connected computer.


EMP-7700

2.6. Driver Board Assy

The Driver board Assy has two functions, one is for converting the R/G/B display signal fromthe Main board Assy unit into analog signals (12 states(EMP-7700) ) (light valve driver sig-nals) and another is for controlling the display image by electrical correction data.The Driver board Assy is a parts of a optical engine, and it is not the object of service parts.

Outside View of the Driver board Assy are shown below.

! Caution:Below is a diagram of the driver board assembly.

Figure2-17 Driver board Assy

Driver Board


EMP-7700

Circuit block diagram of Driver board Assy

Figure2-18

EV9812RB

Controller

CPU

MB90P653AFPV

EEPROM

AT25256N

SCL

RD0[7:0]

GD0[7:0]

BD0[7:0]

CLK

HSYNC

VSYNC

MA I/F

Connector

D[9:0]

A0,WR

BUFFER

DLCK2[A,B,C]SN74LVC04APW

RG1[9:0]

EP_CS,EP_SK-

EP_DI,EP_DO

Level

shifter

Level

shifter

L/V

Connector

GL/V

Connector

L/V

Connector

BR

RCLXIN,RDXIN,RCLYIN,RDYIN,RENBX[2:1]IN,RDIRXIN,RNRS1C

GCLXIN,GDXIN,GCLYIN,GDYIN,GENBX[2:1]IN,GDIRXIN,GNRS1C

RVID[16:11]

RVID[26:21]

GVID[16:11]

GVID[26:21]

BVID[16:11]

BVID[26:21]

ET6060D0A

ET1030F0A

SDA

NRS1A,NRS1B

DIRYIN,NRGIN

BA10324AFV

RLCCOM,GLCCOM,BLCCOM

+3.3V

Power Supply

Regulator

+3.3V_D

(CPU,EV9812RB)

+18V

+15V_A

(S/H)

+15.5V

(VDDX,VDDY)

+5V_D

(S/H)

Regulator

Regulator

Regulator

Regulator

Regulator

+5V_C

(CPU,ET7021)

DDAN

ADRESS:70

M62367GP

Reference

voltage

+9.5V

DCLK2[R1,G1,B1]

GG1[9:0]

BG1[9:0]

ET7040K0A

RC1[9:0]

CS1,RD1

DI,DO

CLK,LD

D/A

OPAMP

+7.0V

OPAMP

BA10324AFV

NRSH,NRSL

LCCOM[A,B,C]

+2.8V

GC1[9:0]

BC1[9:0]

DEC

DRIVER

DEC

DRIVER

DEC

DRIVER

DEC

DRIVER

DEC

DRIVER

DEC

DRIVER

VREFHI,VMID


EMP-7700

Process outline of Driver Board Assy• The CPU (IC900) read the data stored in EE-PROM (correction parameter), and regulate

operation mode of the correction circuit (IC200/300).• The display data output from the Main board Assy unit are once the signal timing is com-

bined by the bus data changer (IC100) before output to the correction circuit.• The timing signals and analog video signals output from the correction circuit are done

electric correction by DAC for best display quality before output.• The RGB video bias circuit generate standard voltage for video amplifier circuit based on

control signal output from driver circuit.• Each shift register generates the display data of 24 bit from 4 analog signals.• The LCCOM circuit generate standard voltage for the light valve driver (LCD) based on

three display voltage control (R/G/B) output from the correction circuit DAC.


EMP-7700

2.7. IF Units

The IF unit has 10 interface connectors and audio controllers.The audio signals are selectedby the IC200 (Audio Controller) at the input interface, and are then output to the main boardassembly.

Figure2-19

CN302 CN300 J300

CN101

J201J202

J301

CN100

CN201

CN202


EMP-7700

Circuit Block

Figure2-20

J201 (PC AUDIO 1 IN)

CN202 (PC AUDIO 2 IN)

CN201 (S AUDIO)

J202 (AUDIO OUT)

CN201 (VIDEO AUDIO)

CN100 (S-VIDEO)

J301

J300

CN302

Audio 1

L-Audio2-R

L-Audio-R

Audio out

L-Audio-R

S-Video

Mouse/Com1

Mouse/Com2

Remote

Level converter0~+9V

Amplifiercircuit

Connected to main board assembly unit

CN1800

CN301

12

L-OUT/R-OUT

+12V

SCL5/SDA5/

AJ-DET/CN1EN/DDC-

CLK/+5V/-5V

AU-DETECT

IC200Audio

Serector

Video


EMP-7700

Function of the audio controller 1. The audio controller perform the selection of the input source, volume, tone quality, sur-

round on/off, and surround control.2. It sends the signal to the CPU on the main board ASSY unit when detects the jack connec-

tion to Audio Out interface.3. It controls mute of an audio amplifier (When detect the Audio Out connection). (Amp mute is

valid only for internal speaker.)4. The tone adjustment is performed by "BASS" "TREBLE". The adjustment step is a cen-

ter±6 step. (Initial value is :center±0)5. The volume adjustment is performed by "AMP VOL" and "LINE OUT VOL". The adjustment

step is 32 steps. (Initial value is :step15)6. Voice mute is performed when "MUTE" key was pushed.


EMP-7700

2.8. RC Receptor Board Assembly

This assembly is equipped with an element which detects (receives) the infrared signals fromthe remote control unit. The RC receptor board assembly is installed to the switch board (atthe front) and to the exhaust duct unit bracket (at the rear).

The receptor board assembly is shown in Figure 2-23.

Figure2-21 Receptor board assembly

The receptor board assembly signal is being jointed the cable to CN1006 (the front)/CN1002(the rear) of the main board ASSY unit and the output signals and Repeater input signal (theserial data) from both receptor board assemblies are an information retrieval decoder and beconverted to 16 bit parallel data. 1. The Main board Assy unit performs the power ON/OFF operation and the starting up

menus, utilizing the serial data received from the remote controller (button switches andpointers).

2. The serial signal send to the Driver board Assy via the Main board Assy unit performs thedisplay control (Freeze / Blank/etc.).

3. The serial signal send to the Main board via the Main board Assy unit performs the audiovolume control.

Circuit block

Figure2-22

RC receptor board assembly

Switch board RC receptor


Remote controller

RC Receptor board Assembly

Receiver IF unit

CN1006

CN1001

CN1800CPU

(IC1101)

Address, I/O Bus controller

(IC1108)

IR decoder(IC1507)

SDA/SCK

CN302 CN301Driver board Assy


EMP-7700

2.9. Speaker Unit

Two speaker brackets at the left and right of the switch board. (8Ω-3W) are equipped insidethe upper case unit, faced upward. The audio input signal from a host computer or AV devicesconnected to this device can be output in stereo through the units.If an external speaker is connected (with the hEMP of an accessory audio cable) to the AudioOut terminal on theIF unit, the built-in speakers are disabled.

Figure2-23 Speaker unit

Figure2-24 Speaker control circuit block

The audio input from the computer or some other audio source is amplified at the AU block ofthe main board assembly, and is then output to the speakers. If the main board assembly unitdetects that if source is connected to the external speaker (Audio Out) terminal, and controlswhether the audio signal is output to the internal speakers or to external speakers (Audio Out).

Speaker LSpeaker R


EMP-7700

2.10. Light Guide Unit

The light guide unit eliminates ultraviolet rays which are harmful to the light valve and uniformsthe intensity of divided the light from the lamp inner housing before dividing it into 3 light out-puts (R/G/B). There are lenses and mirrors for dispersing the light a mirror and lens built in theblock. The below photograph show the appearance and the internal block of the light guideunit (Do not disassemble the light guide unit in the field maintenance).

Figure2-25 Light guide unit

(1). Lens Array Lens Array A/BDispersion of the light from the lamp inner housing by the Lens Array lens array A/Broughly uniform the brightness. The UV filter coated on the surface of the multi-lens arrayeliminates ultraviolet rays to reduce the light valve’s deterioration.The light dispersed through the Lens Array A/B is reuniformed with PBS lens.

(2). CDM

CDM

GDM

Mirror

Condenser lens B adjusting Screw

Condenser LensB

Condenser Lens R/G

PBS lens

Lens Array B UV Filter

Lens Array A

Mirror

Polarization plate B

Polarization plate G

Polarization plate R

MirrorMirror

PBS adjusting Screw


EMP-7700

CDM is a light filter looks red in the visual light. The CDM filter transmit only the red lightand reflect blue and green lights from the light source.

(3). GDMGDM is a light filter looks blue in the visual light. The GDM filter transmit only the blue lightfrom the light source. Since the input light to the GDM is only blue and green lights by theCDM as described above, green light is reflected by the GDM and provided to the lightvalve G.

(4). Condenser LensThe condenser lens collects the light and provide to the next process.

(5). Condenser Lens R/G/BTo collect the lights dispersed into each polarization plate.

(6). Adjusting screws• Adjusting the PBS lens position to obtain the best uniformity of source light.


EMP-7700

2.11. Lamp Inner Housing

This unit includes the light source lamp (200 W) and the ballast power supply connector. Thelamp is secure to the rear of the projector by three screws, and the lamp is a user replaceableitem.The light source lamp las a luminance of 1700 lm, but the luminance becomes lower over timeas the lamp is used. The maximum degree of luminance is obtained when the lamp is firstbeing used, but after approximately 1,500 hours of usage time, the luminance will drop tobetween 50%--70% of this.The ballast power supply connector is used to supply power for driving the lamp to the ballastunit. The lead wires are connected to the lamp.

Figure2-26

1. The light source lampThe brightness of the light source lamp reduces in proportion to its running hours as men-tioned above. In this device the standard lamp life is 1,500 hours. If you notice the lamp bright-ness reduces, we recommend you to replace the lamp inner housing even before 1,500 hours.The total running hour of the light source lamp is written in EEPROM (IC1107) on the Mainboard Assy unit. If the lamp is reaching or has reached the end of its life, CPU (IC1101) out-puts some signals to control the following.

(1). When the cumulative usage time reaches 1,400 hours, the lamp indicator flashes with anorange color. If the indicator starts flashing orange, it means that the lam has reached theend of its useful life, and it should be replaced as soon as possible. If the lamp is usedafter the cumulative usage time reaches 1,400 hours, the message "Please replace theprojector lamp" will flash on the screen.

(2). After the new lamp has been installed, be sure to initialize the lamp usage time by follow-ing the procedure given below.

• Press the HELP button for 5 seconds or more.• After the help menu is displayed, the lamp usage time initialization screen will be dis-

played.• Select "Yes".• Press the ENTER button

Connector for ballast power supply Light source lamp


EMP-7700

The 2-27 shows the control circuit.

Figure2-27 Lamp inner housing control

2. Fuse board The lamp inner housing is installed to distinguish a new one (placed and havenít started up)from an old one. This is the board with rated 100mA fuse, a new one has a fuse circuit. Theterminal sections placed on the both ends of this board touch the FC board installed on theback of the light guide unit. The cable of the FC board is connected to the connector CN2 onthe Driver board Asembly, so the signal from FC board is sent to the Main board Assy unit viathe connector CN100 on the Driver board asssembly. When it is new or changed to a newone, “LSTAT” signal to I/O decoder on the Main board Assy unit becomes high. (+5VA on theDriver board assembly pulls up “LSTAT” signal line through the FC board and the fuse on theFUSE board.) When “LSTAT” shows high, CPU is reset the lamp total hour in EEPROM(IC1107) to zero. After word, I/O decoder on the Main board Assy unit output low level, andconnects “LSTAT” signal line to the ground through a resistance. Consequently, the fuse onthe FUSE board is blown, the lamp total hour in “EEPROM” (IC1107) will not be reset, the run-ning hour is integrated every power ON operation.

CN3 CN3

FC board

Lamp inner housing

FUSE board

Driver board

CN221

CN100

LSTAT

+5V

Ballast power supply

Ballast unit

Power supply Unit

PWON

FANCL

BACTA

LPSTC

LSTAT

CPU(IC1101)

I/O Decorder(IC1001)

EE-PROM(IC1107)


Lamp

CN1001

CN1003

CN1000


EMP-7700

3. Lamp information control

Table 2-5 Lamp information

Lamp indicator EE-PROM Screen display etc.Lamp running hours Keep total running

hours with lamp.Ensure with information ofMENU display.

Exceed 1,400 hours Blink in orangeClear the EE-PROM with lamp replacement.

After the power on,“Exchange lamp” messageappear on the screen.

Out of order (Lamp off) Blink in red Lamp goes off.Number of turn on times Increment by one. Ensure with information of

MENU display.Lamp total running hours withEMP-5500

Keep total runninghours with EMP-7500.

Ensure with information ofMENU display.

Lamp exchange times Keep exchange times. Ensure with information ofMENU display.


EMP-7700

4. Lamp on sequence

Figure2-28 Lamp on sequence

*Filter eliminate ultraviolet rays from light, then output to the light bulb block. If this filter

END

START

Wait30sec

Lamp offError handling

Lamp off(LPCTL signal off)

Driver boardAssy initialize

Main boardAssy unitinitialize

Lamp on(LPCTL signal on)

Rotate the fan

Terminate the followinglamp on sequence

Ballast power supply start

LPSTC signal (Lamp abnormal) OFF

Wait500ms

Wait4Sec

PowerON

Lamp on?

Three times?

NY

N

Y

NY

Overheat or

Sensor error

NY


EMP-7700

2.12. Sensor / Switch

For user’s safety and safety operation of this projector (for prevention from malfunction), thefollowing devices listed the 2-6 are installed in it.

Figure2-29 Sensor/Switch

Table 2-6 Sensor/switch

Name Location/Type Function/UseLamp cover sensor switch Pushbutton switch on middle case

reinforcement plateAC power off, in opening the lampcover unit.

Safety switch On the lamp outer housing(Thermal switch )

Overheat protection for lamp innerhousing area. (AC power off.)

LAMP thermistor On the lamp outer housing Overheat protection for light sourcelamp area.


Safety switch

LAMP Thermistor


EMP-7700

2.12.1. Lamp cover sensor switch

When the lamp cover is removed, the lamp cover sensor witch turns off.

Figure2-30



EMP-7700

2.12.2. Safety Switch

This is the thermal switch for overheat protection installed on the lamp outer housing. If over-heat condition is caused by the contamination of the exhaust fan, normally the thermistors(PBS/LAMP) temporarily shuts off the supply of ballast power to protect it from overheat. Thesafety switch is installed, considering the thermistors trouble in overheat condition.

Figure2-31 Safety switch

To the safety switch the cable with fasten tab is connected from interlock switch. When thetemperature increase to certain degrees, every regulating operations of the power supply unitare stopped. (AC power is shut off and this switch runs once, you can not start up the power,before the temperature decrease to certain degrees.) In this case, you must also consider thethermistor trouble or the Main board Assy unit trouble.

2.12.3. Thermistor and temperature sensor operation

CPU on the Main board Assy unit detects the temperature (resistance) with three thermistorsand five temperature sensors in each 100ms. Five of temperature sensors are placed on theMain board Assy Unit and detect the temperature of major circuit. three of thermistors areplaced in the main body and mainly detect the temperature of optical block area.CPU judge the following state according to the measurment result then change the fan opera-tion or shut down the power.

! Caution:The stop setting values equal the operation setting values less the value in the xxx column.However, there is no stop setting value for high-temperature abnormalities.

Shut downMedium-

lowMedium-

highHigh Warning ∆∆∆∆

Thermistor Arround LH 60 74 75 77 78 80 6Temperaturesensor

Arround L/V 47 44 49 50 55 57 3

ArroundCXA3516

64 60 63 66 71 73 2

ArroundPW364D

64 60 63 66 71 73 2

Arround LH 65 61 63 66 70 73 2

LAMP Thermistor

Safety Switch


EMP-7700

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

*Result of condition affect to the fan operations. Refer to the paragraph 2.13 for details.*Refer to the paragraph 2.14 for detail of temperature indicator.

(1). PBS/Lamp thermistorTwo thermistors are combined with connector and treat as one parts. Lamp thermistor ismounted with screw on the lamp outer housing (closed to safety switch) and detect the tem-perature of lamp area.

Table 2-7 Temperature indicationCondition Temperature

indicatorMeaning

Normal temperature Off Operating in the normal condition Warning temperature Blink in orange

RedProjection will stop if the temperature increase more.

Abnormal temperature Light in red Over heat condition(stop the display)Blink in red Malfunction with fan, thermistor, temperature detec-

tion circuit and etc..


EMP-7700

2.13. Fan Operation

Four of fans are laid on in this main body. These fan exhaust the warm air and prevent the cir-cuit malfunction or damage which will cause over heat condition.

(Mainly lamp inner housing and power supply unit produce the heat and increase the tem-perature.)

Figure2-32 Exhaust fan Figure2-33 Power supply unit fan

Figure2-34 Intake fan Figure2-35Lamp fan

Power supply unit fan

Lamp fan


EMP-7700

(1). Control block diagram of fan

Figure2-36 Fan control block

! Caution:Low-Speed operation occurs only during standby (except when a temperature warning hasoccurred) and when there is a problem with fan operation.

(2). Out Line of function• Each fan has three lead wires, one of these used for status feed back that fan is running or not.• CPU on the Main board Assy unit always observe the fan operations by monitoring feed back

signals. If the feed back signal condition is different from expected, CPU judge as fan abnor-mal condition then turns on temperature indicator in red and turn off lamp with ballast poweroff.

• Fan drive bias for intake fan and exhaust fan are regulated at the driver circuit (consist fromregulator and transistor circuit) according to the fan control signal from CPU on the Mainboard Assy unit. (Intake fan has three state :stop /slow /fast, Exhaust fan has five state :stop /slow /midium-slow /midium-fast /fast)

• Power supply fans is provided drive bias which produced on the power supply unit.

Intake FanFCTL01 1: Slow (10.0V) 0: Fast (12.0V)FCTL00 1: Run 0: StopFRS1 1: Run 0: StopFRS0 1: Run 0: Stop

Exhaust Fan

FCTL23,22,21

001: Slow (8.0V)010: Midium-Slow (9.0V)100: Midium-Fast (10.0V)000: Fast (11.0V)

FCTL20 1: Run 0: StopFRS2 1: Run 0: Stop

Lamp FanFANCL 1: Slow 0: Fast

Regurator(12V_F)

FRS2

2.5A13V

ControllerIC1108

CPUIC1101

ReguratorIC1400


CN1400

CN1401

CN1002

ReguratorIC1401

Intake Fan

Lamp Fan

FRS1

FRS0

FCTL21

FCTL20

FCTL01

FCTL00

Exhaust Fan

Pow

er Supply unit

CN1800


EMP-7700

(3). Fan operation• Stand by:

Turn on the fan regurator then drive the intake fan1/2 and exhaust fan with slow modewhen the thermistor detect the temperature of “Slow“ level or temperature sensor detectthe level of “midium-low“.Stop the intake fan1/2 and Exhaust fan then shut down the fan regulator when the ther-mistor detect the below of “Slow“ level or temperature sensor detect the below of “midiun-low“.

• Lamp on:Befor 0.5 second, start up the intake fan and exhaust fan for lamp on. After the lamp on,both fan operation are controlledaccoording to the thermistor and temperature sensor.(Refer to the paragraph 2.14 for detail)

• Cool downAfter the lamp “Fast“ condition until the thermistor and temperature sensor detect thebelow level of “Slow“.


EMP-7700

2.14. LED indicator

Three of indicators are mounted on the Switch assembly board unit and indicate the machineoperation status. You can see these indication at slit on the upper case unit.

Figure2-37 Indicator

*1 second 50%duty. Blink2:2 second 50%duty.

Table 2-8 Indicator operation

Operation indicator

Lamp indicator Temperature indicator

MeaningsOrange Orange OrangeGreen Red Green Red Green Red

ON OFF OFF OFF OFF Standby mode(Sleep mode)

Blink 1 OFF OFF OFF OFF OFF Lamp warm-upON OFF OFF OFF OFF OFF Lamp onBlink 1 Blink 1 OFF OFF OFF OFF Cool down modeOFF Blink 1 OFF OFF OFF Blink 1 Bas error (Circuit malfunction)ON OFF Blink 1 Blink 1 OFF OFF Warning for lamp life (during lamp on)Blink 1 OFF Blink 1 Blink 1 OFF OFF Warning for lamp life (during warm-up) Blink 1 Blink 1 Blink 1 Blink 1 OFF OFF Warning for lamp life (during cool

down)ON OFF Blink 1 Blink 1 Blink 1 Blink 1 Warning for lamp life and overheat

(during lamp on)Blink 1 OFF Blink 1 Blink 1 Blink 1 Blink 1 Warning for lamp life and overheat

(during warm-up) Blink 1 Blink 1 Blink 1 Blink 1 Blink 1 Blink 1 Warning for lamp life and overheat

(during cool down)OFF OFF OFF ON OFF OFF Lamp lifeOFF OFF OFF Blink 1 OFF OFF Lamp or ballast power defectOFF OFF OFF Blink 2 OFF OFF Lamp fuse defectON OFF OFF OFF Blink 1 Blink 1 Overheat operation (Lamp on)Blink 1 OFF OFF OFF Blink 1 Blink 1 Overheat operation (Warm-up)Blink 1 Blink 1 OFF OFF Blink 1 Blink 1 Overheat operation (Cool down)OFF OFF OFF OFF OFF ON OverheatOFF OFF OFF OFF OFF Blink 1 Fan defectOFF OFF OFF OFF OFF Blink 2 Sensor defect

Temperature indicator

Lamp indicator

Operation indicator


EMP-7700

2.15. Operation Panel (Upper Case Unit)

The operation panel has 15 switches, and is connected between connector CN100 on theswitch board and connector CN1006 on the main board assembly unit.

Figure2-38 Operation Panel


Chapter 3 Disassembly and assembly

EMP-7700

3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES

This section explains how to disassemble the EMP-7700. The reassembly procedure is theexact reverse of the disassembly procedure.

(1). Preparatory Procedure1. 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 power of EMP-9000/8000LCP and the host computer.5. Unplug the power cord from the main unitLCP and service outlet.6. Disconnect the interface cable from the main unitLCP.7. Clean the air filter, interface and case cover with a vacuum cleaner.

(2). Required tools and accessoriesPrepare 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 folowing table.

* Do not disassemble the Optical engine.* Do not individually replace any of the components which make up the optical engine exceptfor the projection lens unit.The optical components listed in the next page are required the mechanical alignment or elec-trical correction in the control circuit. (writing the image adjustment data)

Table 3-1 : Tool requirement

Name Q.t.y Supply UsePhillips screwdriver 2 1 Market Dissasemble the case and interiors(-)Phillips screwdriver 1 Market Remove lamp cover and air filter coverTweezers 1 Market Unlock the FPC connnector on D.R boardBrush 1 Market Burush off the dust around fanVacuum cleaner 1 Market Clean the fan and filterPaper wiper Some Market Clean the projection lensAir blower 1 Market Clean the fan and filter.Glove 1 Market Avoide finger injuryWrist band,Groung map 1 Market Avoide electro ststic influenceDriver Six corner (5mm) 1 Marker For the D-Sub fixed screwDriver Six corner (5.5mm) 1 Marker Removing the spacerTorx screwdriver (H10) 1 Marker Removing the upper case unit

Table 3-21 Optical head unit These units are specified as “Optical

engine”.(Treat as one replaceable part in thefield maintenance.)

2 Prism unit3 Light guide unit 4 Driver board Assy


EMP-7700

Mechanical adjustments for optical engine.

1. Optical Head UnitThe 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 and also not loosen the screws.

2. Prism UnitTo 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 unitThe alignment of the light guide unit on the optical head unit is applied (gap and concurrent tothe 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 their combina-tions, the factory setting is applied to the light guide unit to support the best display perfor-mance. (If the alignment is modified or the location is changed, there comes distortion on thedisplay screen, therefore clear image will nit be made.) ! Caution:Do not disassemble the light guide unit. If you remove the upper guide cover from the unit, thealignment of lenses or mirrors may be unintentionally changed and also dust may stick to theunit.Since Optical engine on the EMP-7700 requires very precise adjustment, it can not beadjusted in the field.

Electrical corrections(DR board)

Some parts in the mechanical section of the optical system require some mechanical adjust-ments mentioned above. In the control circuit (Driver Board Assembly), the output driver forthe display signal is slightly different from the output driver of other device (Driver BoardAssembly) in individuality. The mechanical section itself of the optical system (e.g. light valves)must be electrically corrected. Therefore to obtain the best image, not only the mechanicaladjustment but the electric correction is required. For this reason some correction values arewritten to Flash ROM of the Driver Board Assembly on factory shipping. For matching the opti-cal system and electrical system, the electric correction is necessary. Consequently, the driverboard and the optical block (consists of optical head / light guide unit) make one set.

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

• Gamma adjustment data• Flicker adjustment data• Ghost contrast adjustment data• Sub contrast adjustment data

! Caution:For the writing correction values, an expensive, special device and also skillful engineer arenecessary, therefore it can not adjust in the field.


EMP-7700

(4). Caution for field maintenance

Observe the following procedure, when you repair. Otherwise, display quality is not guaran-teed, and also EPSON repair service is not available.

1. Do not disassemble the block. (Do not loosen any screws.)2. If either the optical block or the Driver Board Assembly becomes wrong, replace them in set.

And when you send back them to us for repair, send back them in set (by optical engine).3. The optical block and the Driver Board Assembly make the optical engine set, so never

change its combination (e.g. use only the driver board1 for the other repair parts).

(5). Precautions

Precautions given to the individual assembly and disassembly procedures. Read them care-fully before starting the assembly or disassembly procedure. A set of general precautions aregiven below.As you disassemble the main unit, dust that is sticked to the internal fans and air filters is likelyto migrate and contaminate the light valves R, G, and B which are the heart of the displaymechanism, 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 electric-ity. When you remove a optical engine or circuit board ,place it in an antistatic bag immedi-ately.When you perform the assembly or disassembly operations listed below, check the pertinentunit and its surfaces for any dirt before reinstalling them. If the unit is found dirty, clean it.

The speaker unit incorporates a permanent magnet. Keep it away from electromagneticmedia such as floppy disks and magnetic cards.

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

Do not try to disassemble any part (e.g., power supply unit) that is not covered in this manual.

1. Removing the optical engine.2. Removing the lamp inner housing.


EMP-7700

3.2. DISASSEMBLING THE MAIN UNIT

The flowchart for disassembling the main unit is shown below. You can take same disassem-bling procedure for EMP-7700. Since you can reassemble the dismantled parts in the reverseorder of disassembly, unless specifically specified, this manual contains no reassembly proce-dure. Detailed descriptions of the disassembly procedures are given in subsections 3.2.1through 3.2.20

3.2.1. Disassembly flow chart

Figure3-1 : Disassembly flow chart

Start

Upper cace unit

Speaker unit

Main board assembly

Speakers

Key top

Lamp cover unit

Middle case L1 unit

Middle case L2 unit

Lamp inner housing

Front case

IF unit

Ballast unit

Optical engine

Safety switchThermistor lamp

Intake fan guard

Projection lens

Focus ring

Zoom ring

Intake fan

(P3-8)(P3-6)

(P3-7)

(P3-9)

(P3-10)

(P3-17)(P3-10)

(P3-11)

(P3-12)

(P3-12)

(P3-14)(P3-14)

(P3-16)

(P3-16)

Exhaust fan

Lower duct

Duct sponge A

Duct sponge B

(P3-16)Middle case R unit Handle

(P3-19)

Exhaust duct unit

Power supply unit

Foot unitLower case unit

(P3-20)

(P3-20)

(P3-21) (P3-21)

RC receptor boardassembly

Auxiliary duct unit/Lamp fan unit

(P3-15)

(P3-15)

(P3-15)

(P3-9)


EMP-7700

3.2.2. Lamp Cover Unit

1. Loosen the lamp cover unit screw, and then remove the lamp cover unit from the rear of themain unit.

Figure3-2

Screw

Lamp cover


EMP-7700

3.2.3. Lamp Inner Housing

1. Loosen the two fixing screws.2. Hold the lever and remove the lamp inner housing.

Figure3-3

! Caution:Pay attention to handling because the Lamp might be superheating Immediately after lamp isused.When installing the Lamp Inner Housing, take care not to touch the lamp’s reflector with ahand (to prevent the reflector flom being contaminated).

Lamp inner housing

Screw


EMP-7700

3.2.4. Upper Case Unit

1. Remove four screws fixing the Upper Case Unit then open the Upper Case Unit to directionof the arrow.

Figure3-4

Upper case unit


EMP-7700

3.2.5. Main Board Assembly Unit / Speaker Unit

1. Disconnect the cables from the speaker unit and the main board assembly unit.2. Remove the speaker unit from the projector.3. Remove the IF panel from the main board reinforcing plate.4. Remove the six main board fixing screws (+, Capco, 3x6, F/Zn).5. Disconnect all cables which are connected to the main board.6. Remove the main board assembly unit.

Figure3-5

! Caution:Refer to page.2-13 about cable splicing figure of Main Board Assy Unit.

Main board assembly unit

Key top

Speaker

Speaker unit

IF panel


EMP-7700

3.2.6. Front Case

1. Remove the stopper bracket.2. Disengage the tabs at the left and right of the front case from the middle case L and R.

Figure3-6

3.2.7. Middle case L unit

1. Remove the two screws (+, Capco, 3x6, F/Zn) which are securing the IF unit and the middlecase L1 unit.

2. Remove the two screws (+, Capco, 3x6, F/Zn) which are securing the middle case L1 unit.3. Remove the middle case L1 unit from the lower case.

Figure3-7

Tab

Tab

Stopper bracket


EMP-7700

3.2.8. Middle case L2 unit

1. Remove the two screws (+, Capco, 3x6, F/Zn) which are securing the IF unit and the middlecase L2 unit.

2. Remove the screw (+, Capco, 3x6, F/Zn) which is securing the middle case L2 unit, andthen remove the middle case L2 unit from the lower case.

Figure3-8

Middle case L2 unit


EMP-7700

3.2.9. IF unit/Ballast unit

1. Disconnect the cable which is connected to the driver board assembly at the top of the opti-cal engine.

2. Disconnect the cable which connects the power supply and the ballast unit.3. Remove the lamp connector presser. Remove the connector from the lamp inner housing

and take it out of the lower case.

Figure3-9

4. Remove the two screws (+, binding, P tight, 3x8, F/Zn) which are securing the IF unit andthe ballast unit, and then the ballast unit can be removed.

Figure3-10

Lamp connector presser

Ballast unit

IF unit


EMP-7700

5. Remove fourteen screws fixing the IF Fixing Plate, and remove the BNC ReinforcementPlate on the IF Fixing Plate.

6. Separate IF Fixing Plate and IF Circuit Assy.

! Caution:When installing the IF unit, refer to 2.7 and confirm cable is wired correctly.

Figure3-11 Figure3-12

Screw (HSH)

Screw CBP-tite M3x8 Screw (+Capco, 3x6, F/Zn)


EMP-7700

3.2.10. Thermistor LAMP

1. Remove a screw(Screw, CBP-tite M3x8) fixing the Thermistor OA/LAMP, then detach theThermistor LAMP on the Optical Engine.

Figure3-13

3.2.11. Safety Switch

1. Disconnect two wire cables conneced to the Safety Switch.2. Remove two screws(Screw, CP(S-P1) M3x6) fixing the Safety switch, then detach the

Safety Switch on the Optical Engine.

Figure3-14


EMP-7700

3.2.12. Optical Engine

1. Disconnect the cable.2. Remove five screws fixing the Optical Engine, then detach the Optical Engine on the Lower

Case Unit.

Figure3-15

3.2.13. Auxiliary Duct Unit / Lamp Fan Unit1. Remove the two screws which are securing the auxiliary duct unit, and the remove the auxiliary

duct unit from the optical engine.2. Remove the two screws which are securing the lamp fan unit, and then remove the lamp fan

unit from the optical engine3. Remove the screw (+, binding, P-tite, 3x8, F/Zn) which is securing the RC receptor board

assembly, and then remove the RC receptor board assembly from the optical engine.

Figure3-16

Auxiliary duct unit

Lamp fan unit

RC receptor board


EMP-7700

3.2.14. Intake Fan/Exhaust Fan

1. Remove the intake fan and exhaust fan guards which are at the bottom of the opticalengine. The guards are secured by two screws (+, binding, 4x30, F/Zn).

Figure3-17

2. Remove the exhaust fan which is at the bottom of the optical engine.The exhaust fan is secured by three screws (+, standard, Sems S2W1, 4x22, F/Zn)

Figure3-18


EMP-7700

3.2.15. Projection Lens assembly

1. Remove four screws(Screw, HSH M4x8) fixing the Projection Lens by using exclusive use 4corner wrench then take out Projection Lens from Optical Engine.

Figure3-19

2. Remove the Zoom / Focus Ling from the Projection Lens. Each is fixed three screws(Screw,CPB-tite Mini M2x4).

Figure3-20

! Caution:Take care not to touch the lens surface of the Projection Lens with a hand (to prevent their sur-face from being contaminated).When installing the Projection Lens, take care Screw and label becomes the upper side.

Zoom Ling Focus Ling


EMP-7700

3.2.16. Replacing the attachment lens

• Attachment lens removalWhile pressing the attachment lens lever, turn the attachment lens in the direction of thearrow.When the attachment lens cannot be turned any further, pull it forward. When removingthe attachment lens, turn it gently to the left and right to make removal easier.

Figure3-21

• Attachment lens installationAlign the notch on the attachment lens with the notch in the lens holder. Then turn the lensin the direction of the arrow until it cannot be tuned any further.

Figure3-22


EMP-7700

3.2.17. Middle case R unit

1. Remove the two screws (+, Capco, 3x6, F/Zn) which are securing the IF unit and the ballastunit, and then the ballast unit can be removed..

Figure3-23

2. When the handle shaft is removed, the handle can then be removed from middle case R.

Figure3-24

Middle case R unit

Handle cover

Handle

Middle case R

Handle shaft


EMP-7700

3.2.18. Exhaust duct unit

1. Remove the RC receptor board assembly from the exhaust duct unit.The RC receptor board assembly is secured by one screw (+, binding, P tight, 3x8, F/Zn).

2. Remove the four screws (+, Capco, 3x6, F/Zn), and then remove the exhaust duct from thelower case.

Figure3-25

3.2.19. Power supply unit

1. Remove the five screws (+, Capco, 3x6, F/Zn) and the screw (+, standard pan-head, semsB, 4x6, F/Ni) for securing the ground, and the two hexagonal head screws, and then removethe power supply unit from the lower case.

Figure3-26


EMP-7700

3.2.20. Lower case unit

Figure3-27

3.2.21. Foot unit

Figure3-28

Foot cushion

Lower case

Air filter

Screw

Front levers R & LFront cushion unit


EMP-7700


Chapter 4 Troubleshooting

EMP-7700

4.1. Before Starting Troubleshooting Procedures

1. Whenever you replace a unit or block for maintenance purposes, double-check thereplaced unit or block is defective (to determine whether the problem was due to a poorcable connection).

2. If you find questions you want to check while examining the flowchart, be sure to checkthose items during the troubleshooting procedure.

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

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

4.1.1. Tools and Accessories Required for Troubleshooting

The tools and accessories required for troubleshooting (including fault isolation) are listedbelow. They need to be prepared by the user.

4.1.2. Field Replacement Parts

The parts that need be replaced during troubleshooting , such as board, cases, plates, andscrews, refer to the parts list listed in an appendix of this manual.

Optical engine (consist from Light guide unit, Optical head unit, Projection lens unit, Prism unitand Driver board Assembly) is the one maintenance unit. Do not separate any unit from opti-cal engine.

! Caution:This chapter omits “Main board Assy Unit“ with “MA Board“ for space.

Table 4-1Name Quantity Use/Remarks

Screen 1 To project imagesRule (3 m) 1 To measure the projection distanceHost computer 1 To supply test patterns (PC or compatible)Color display monitor 1 To manipulate and display on host computerVideo equipment 1 To test video input

(video deck, video camera, etc.)External speaker unit 1 To test voice output (with audio cable terminals)Multi-meter 1 To measure resistance and voltage (AC/DC)Tool set 1 set Tools and accessories listed in Section 3.1


EMP-7700

4.2. Entry

Follow the flowchart shown below when starting troubleshooting EMP-7700 problems andproceed to the pertinent detailed flowchart (given on the next and subsequent pates).

Figure4-1

Outside view

Internal cable connectors

Power ON/OFF

Display/Picture quality

Audio out

Operation panel

Remote controller

Mouse/Cominterface control

Others

Start

・ Visual check for outside view. (Check out the any damage on the cover area.)

・ Ensure internal cable connections. Remove the upper case unit. (Reconnect the cable if necessary)

・ Ensure power on/off and initialization (No signal display). (Connect power cable and turn on the power.)

・ Ensure screen display and picture quality. (Connect host computer, video device and monitor.)

・ Ensure audio output to the internal speaker and external speaker.　(Connect external speaker)

・ Ensure button operations on the Operation panel.

・ Ensure button operations on the remote controller. (Front /Rear)

・ Ensure link set functions from remote controller. (Link set option is necessary.)

・ Others’ (Noise, Over heat, etc.)


EMP-7700

Outside viewTurn off the power then remove power and interface cables.

Figure4-2

Upper case unit

Start

Key top

Lamp case unit

Projection lens unit

Lower cover unit

Air filter

Handle

Foot Unit

• Any transformation or crack are not presented.• Upper case unit is secured to the lower case with screws.(Refer to 3.2.3)

• Button switches should move in smoothly.• Operator panel is fixed on the upper case with four tabs.

• Any transformation or crack are not presented.• Rear case unit is secured to the upper case unit and lower case unit.• Dirt condition is not presented on it air duct.

• Focus ring and zoom ring are adjustable.(move it in easily)• Dirt condition is not presented on the lens surface.

• Any transformation or crack are not presented.

• Air filter frame is looked on the lower case unit.• Tab on the Air filter frame is not transformed.• Dirt condition is not presented on the Air filter frame.• Dirt condition is not presented on the cooling fan.(cooling fan is located under the

Air filter frame.• Two of fixing screw on the Lamp cover are not loosen.• Tab on the Lamp cover is not transformed.

• Any transformation or discoloration are not presented on the Lamp inner housingframe and power cable connector.

• Any damage or dirt condition is not presented on glass surface.• Discoloration are not presented on the FC board.

• Foot lever A/B should move in smoothly.

Lamp cover unit/Lamp inner housing

Interface connectors

AC inlet

Attach the Lamp inner housing and Lamp cover unit.

• Any transformation or discoloration are not presented on the interface connector.(rust may cause discoloration.)

• Any damage or dirt condition is not presented on the socket.

• Discoloration is not presented on the connector terminal.• Any damage or dirt condition is not presented on the socket.

Middle case L1 unit

Middle case L2 unit

Front case

Middle case R unit

• Has the part been damaged,bent or cracked from having been dropped?

• Has the part been damaged,bent or cracked from having been dropped?• Is the RC receptor cover dirty or coverd with some other object(such as tape)?

• Has the part been demaged,bent or cracked from having been dropped?• Is the RC receptor cover dirty or coverd with some other object(such as tape)?

• Has the part been damaged,bent or cracked from having been dropped?


EMP-7700

Internal cable connectionsBefore taking following flow, turn off the power then disconnect power cable.

Figure4-3

Switch Assembly

Start

• CN1006 on the MA board.(lock type)

MA Board Assembly


Power supply unit / Ballast Unit

Lamp cover removal

Thermistor Lamp

Exhaust fan

RC receptor board(rear)

Intake fan

IF unit

Attach the upper case unit

Attach the Lamp cover unit

• CN1006 on the MA board to CN100 on the MA board.• CN1800 on the MA board to CN301 on the IF unit.• CN1804 on the MA board to CN303 on the IF unit.(lock type)

• CN1801/1802 on the MA board.

• CN1004 on the MA board to CN on the Power supply unit B.• CN201 on the DR board to CP501 on the Ballast unit A.• Power supply unit to CP1 on the Ballast unit.

• Driver board CN200 ⇔ Lamp cover sensorswitch.

• CN1010 on the MA board


• CN1401 on the MA board(Intake fan)

• CN301 on the IF unit to CN1800 on the MA board.

Speaker Land R

Lamp fan• CN1400 on the MA board

Middle case R unit removal



EMP-7700

Power ON / OFF

Figure4-4

Start

Press Power button onthe Operation panel.

Operation indicatorbecomes lights in

green?

Does Intake fan move?

Does power supply unit

A/B fan move?

Dose Exhaust fan

move?

Press Power switch on the switch

panel pushes down 30 second.

Does AC input voltage

is correct?

AC power is applied on

the interlock switch. • Remove the power cable.• Unplug the fast-on tab onthe safety switch.

• Measure the safety switchresistance.

Replace AC power

Go to start

Filter unit A

Press Power button bythe Remote controller .

Operation indicatorbecomes lights in green?

Replace Vacuum fan

Does exhaust fan

move?

Replace applicable

power supply unit.

Replace Exhaust fan

Dose Exhaust fan

move?

Safety switchresistance is nearly

zero ohm?

Fixed?

Go to start

Go to start

Go to start Go to start

Replace MA board

Replace power supplyunit A

Replace MA board

Replace Safety switch

　 A

No

YesYes

NoNo

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No


EMP-7700

Figure4-5

A

Does the light source

lamp is turned on?

Operation indicator

become lights Green?

Lamp indicator become

lights or blink in red?Temperature indicator

becomes blink in orange?

Replace these thermistor

one piece each

1.LAMP

Replace lamp

Cleaning the fan (Intakefan, Power supply fan,

Exhaust fan)

Fixed?

Fixed?

Operation indicator

becomes blink in red?

Lamp and temperature

indicators are off?

Lamp indicator become

blink in orange?

Lamp indicator is it turnoff.

Replace MA board.

Replace MA board.

Warning for lamp life. Press power button

(Off)

Operation indicator

becomes blink in orange?

Wait 60 sec

Operation indicator becomeslights in orange?

Operation indicator goes off?

Replace MA board.

Cool down

Operation, Lamp, Temperature

Overheat condition

(Turn off the power and

cool down enough)

Fan or thermistors

problem. Replace the

following unit.

1.MA board

2. LAMP thermistor

A

A

No

Yes

No

Yes

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

No

Normal and Go to next page.

Temp indicator becomes

blink Orange?

A B

B


EMP-7700

Display / Pictuer quality

Figure4-6

Does “NO SIGNAL” messageappear on the screen?

Replace MA board.

Does “NO SIGNAL” messageappear on the screen?

Replace Optical engine.

Does fine image appear byadjusting focus and zoom ring.

Press Menu button on theswitch panel or remote

controller.

Does Menu screen appear?

Take the adjustment shownin the table 1.

Does fine image appear?

Replace MA board.


Take the adjustment shownin the table 1.


YESYES

NO NO

YES

NONO

YES

YES

NO

YES

NO

YES

NO

Replace optical engine.

Start

Does screen appear?

Lamp indicator becomesblink in red?

Replace Lamp inner housing.

Does light source lamp on?

Replace MA board.

Reconnect the cable connector onthe CN1003(MA board) to Ballast

unit.


Replace Ballast unit A.

YES

NONO

NO

YES

NO

YESNO

YES

NO

Go to

next page.

NO

YES

Lamp indicator becomeslights or blink in red?

Replace the following

thermistors.

1.PBS

2.LV 3.LAMP



YES

Computer In1/2

Video In/S-Video

・ Brightness・ Contrast・ Synchroniz

ation・ Tracking・ Color

・ Brightness・ Contrast・ Saturation・ Tint・ Sharpness

! Caution:Even the picture quality defectiveness that originates fromcondensation or dirt of lens is conceivable. In case of con-densation, it becomes normal naturally if it leaves for awhile.


EMP-7700

Continued from page 4-7

Figure4-7

CReplace optical engine.

NO

Connect host computer to

the Computer In interface.

Does picture quality is good?

Does screen appear?

Change the video mode by

pressing source button.

Does screen appear?

Replace Main board.

Does screen appear?

Replace computer cable.

Does picture quality is good?

Take the adjustment shown

in the table 1(page 4-7).

Does screen appear?

YES

NO

YES

YES

YES

YES

YES

NO

YES

NO

YES

NO

NO

NO

NO

NO

NO

NO

YES

YES

Does following devices arechecked?

１． Video In２． S-Video In

Connect the proper device

which are not checked.

A

A

C

Connect the CRT to theComputer Out interface.

Does screen appear on theCRT?

Replace MA board.

Does screen appear on the

CRT?

Replace monitor cable.

Does screen appear on the

CRT?

Replace CRT monitor.

Go to Audio out

B C

B


EMP-7700

Audio out

Figure4-8

Connect the audio cable tothe Audio In interface.

Does A/V devices arechecked?

Connect the audiocable to the Audio In

L/R interface.

Does internal speaker R/Loutput the sound?

StartA

YES

YES

YES

NO

NO

NO

YES

NO

YES

NO

YES

NO

YES

NO

A

Does external speakeroutput the sound?

Does Mute button works?

Connect the externalspeaker to the Audio out.



Does volume control works?

Replace speaker R/L.

Replace MA board

Replace MA board.Replace MA board.

Go to Operator panel.

Replace MA board.

Re-connect the CN201/202on the MA board.


EMP-7700

Operator panel

Figure4-9

Start

Does power button works?

Does menu button works?

Does Sync +/- button works?

Does Enter button works?

Does computer button works?

Replace Operation panel.

Does all button works?

Replace MA board.

Does Help button works?

Does Resize button works?

Does Volume button works?

Does AV Mute buttonworks?

Does Tracking +/- buttonworks?

Does Video button Works?

Does ESC button works?

Does Key stone buttonworks?

Does Shift +Volume buttonworks?

YES

NO

NO

NO

NO

YES

NO

YESYES

YES

YES

NO

NO

NO

NO

YES

YES

YES

NO

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Go to Remote controller.

Reconnect cable connectoron the CN502 of MA board.

Does all button works? NO

Speakers.


EMP-7700

Remote controller

Figure4-10

Does Remote controller works with 10m distance of

the front and the rear?

Does remote controller works

with 10m distance of the

front and the rear?

Does remote controller works

with 10m distance of the front

and the rear?

Replace batteries.

Replace the RC receptor

board (rear).

Replace the speaker unit

(front).

Replace Remote controller.

Does all switches are works correctly?

Exchange remote controller.

Does all switches are works correctly?

Replace MA board.

Replace batteries.

Does power ON/OFF are available?

Exchange Remote controller.


Re-connect RC receptor cable.


Replace RC receptor.


Replace MA board.


Replace RC receptor cable.

YES

NO

NO

YES

NO

Start


NO

Go to

others

NO


EMP-7700

Others

Figure4-11

Start

Noise problem? Suspect following defects.・ Exhaust fan, inhale fan and fan on the power supply unit.・ Power supply unit (Vibration noise from pulse transformer)

Suspect following defects.・ Thermistor (LV, LAMP, PBS) or safety switch.・ Exhaust fan, Inhale fan, Power supply unit fan.・ Air filter (Dirt condition)

Suspect following defects.

・ Optical engine (May cause with dirt condition on the light guide unit, projection

lens unit and light valve on the optical head unit.)

Suspect following defects.・ AC input(Include power line transit or distortion)・ Power supply unit・ MA board・ Cable connection (fail to make condition.)

Overheat problem?

Image display problem?

Low reproduced problem?

YES

YES

YES

YES

NO

NO

NO


EMP-7700


1

EMP-7700

SEIKO EPSON Revision:A

Index

AAAA

Accessory specification 1-9

BBBB

Ballast unitCircuit Block 2-10Input/output specification 2-11Process outline 2-10

DDDD

Disassembly flow chart 3-5Driver Board Assembly

Circuit block 2-19Process outline 2-20

EEEE

Electrical SystemConnections 2-4function 2-6

FFFF

Fan Operation 2-36Filter unit 2-6

IIII

IF Panel Units 2-21Circuit Block 2-22

Inquiry tip 0-4Inside view of main frame 1-6Interface Specification 1-11

LLLL

Lamp Inner Housing 2-28Circuit block 2-29Lamp on sequence 2-31

LED indicator 2-39Light Guide Unit 2-26

MMMM

Main Board Assy UnitCircuit block 2-13

Function outline 2-14Process Outline 2-16

Main unit specifications 1-8

OOOO

Operation Panel 2-40Optical system block 2-2

PPPP

Power Supply Unit 2-7Circuit block 2-7Outline of function 2-8

Process OutlineCircut process block 2-3Optical Process block 2-3

Projection image size 1-2Protection From

Accidental Injuryobstacles 0-3Accidents 0-3Electric Shock 0-3

RRRR

RC Receptor Board Assembly 2-24Record of Revisions 0-2Remote Controller 1-7Resolution 1-2

SSSS

Sensor / Switch 2-32Interlock Switch 2-33Safety Switch 2-34Thermistor and temperature

sensor 2-34Speaker Unit 2-25

TTTT

Tools and accessoriesFor Disassembly and assembly 3-2For Troubleshooting 4-2

Trademark 0-1

VVVV

VCCI rules 0-1

Documents

EMP-7700 Service Manual