EMP-7700

Data Projector

EMP-7700

Revision:A

SEIKO EPSON

EMP-7700

SEIKO EPSON

Revision:A

Chapter 1 Product general

1.1. PRODUCT GENERAL ............................................................................ 1-2
1.2. PART NAME ........................................................................................... 1-3

1.2.1. Outside View of Main Frame ........................................................... 1-3
1.2.2. Inside view of main frame................................................................ 1-6
1.2.3. Outside View of Remote Controller ................................................. 1-7

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

1.3.1. Main unit specifications ................................................................... 1-8
1.3.2. Accessory specification ................................................................... 1-9

1.4. INTERFACE SPECIFICATION ............................................................. 1-11

Chapter 2 Theory of operation

2.1. Hardware Configulation .......................................................................... 2-2

2.1.1. Process Outline ............................................................................... 2-3
2.1.2. Electrical System............................................................................. 2-4
2.1.3. Optical System Connections (Optical Engine) ................................ 2-4

2.2. Safety switch.......................................................................................... 2-6
2.3. Power Supply Unit .................................................................................. 2-7

2.3.1. Power supply unit circuit block ........................................................ 2-7

2.12.1. Lamp cover sensor switch........................................................... 2-33
2.12.2. Safety Switch............................................................................... 2-34
2.12.3. Thermistor and temperature sensor operation ............................ 2-34

2.13. Fan Operation ..................................................................................... 2-36
2.14. LED indicator ...................................................................................... 2-39
2.15. Operation Panel (Upper Case Unit) .................................................... 2-40

EMP-7700

Revision:A

SEIKO EPSON

Chapter 3 Disassembly and assembly

3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES .............................. 3-2
3.2. DISASSEMBLING THE MAIN UNIT ....................................................... 3-5

Chapter 4 Troubleshooting

4.1. Before Starting Troubleshooting Procedures .......................................... 4-2

4.1.1. Tools and Accessories Required for Troubleshooting..................... 4-2
4.1.2. Field Replacement Parts ................................................................. 4-2

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

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EMP-7700

SEIKO EPSON

Revision:A

INTRODUCTION

This 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 are
provided in the Technical Information releases, and so you should use them to update this
manual periodically.

HOW TO USE THE SERVICE MANUAL

Since 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 safety
precautions and observe safety rules.

VCCI RADIO FREQUENCY INTERFERENCE SELF RESTRICTION

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

TRADEMARK

IBM and DOS/V are the trademark or the registered trademark of International Business
Machines 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.

NOTICES

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

of SEIKO EPSON CORPORATION.

2.Any of description in this document is the subject to change without notice in future.
3.The information and specification in this document are the most up-to-date at the time of

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

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

item 3 above.

2000 SEIKO EPSON CORPORATION

precautions : SAFETY,MAINTENANCE,PERSON
chapter 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 SHOOTING

PARTS LIST, EXPLODED DIAGRAM

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SEIKO EPSON

Record of Revisions

Memo Random

Free area to memorize any important technical information here.

History

Issued Date

Alternation

REV.A

2000.9.1

REV.B

2000.10.18

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SEIKO EPSON

Revision:A

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

(2). PROTECTION FROM ACCIDENTAL INJURYOBSTACLES
* Be sure not to touch the lamp inner housing and its circumstances after the power is turned
off, they may be heated up even after the cooling down process was ended. Also make sure
not 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 prevent
the device or parts from being dropped. Be careful not to place tools and parts on the device
or at your feet.
* Whenever doing any repair work on the product, be sure to away from a place for foreigner
come across in order to prevent the product from being used in incomplete condition or 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 Optical
engine), it is recommended to touch the electrostatic plastic bag of the component to the
metallic 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 the
connectors until it stack to the connector edge.
* When remove the FPC cable be sure to remove the connector lock in advance. When
remove the cable on the CN/003/1800 of the Main board assembly unit or CN700~702 of the
Driver 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 is
done 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 some
components. 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

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SEIKO EPSON

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

SEIKO EPSON CORPORATION
4897 SHIMAUCHI, MATSUMOTO-SHI,
NAGANO-KEN 390-8640 JAPAN
ATTN: Visual Device Customer Support Group

Chapter 1 Product general

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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 optical
block(220W uHra high efficiency lamp) enable to achieve a wide projection image from 30" to
300" (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 approximatly
2.3 million (1024x768x3) dots.

• The signal to VGA~UXGA is able to be projected full screen with the adoption of Epson

original 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 provided
for 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 EMP
LINK áV software that combines as a standard accessory of product.

• Connectivity with various computers

The advanced data signal determination function Standard attachments of interface cables and
adapters enables EMP-7700 to connect with various computers such as IBM-compatible PCs and
laptops, 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 of
miscellaneous computer (DOS/V, Mac, PC98) output. No matter what type of output is used, the
result is video image of outstanding clarity.

• Simple Maintenance

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

• Celing mount (option part)

Table 0-1The projector can be fixed to the celing.

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1.2. PART NAME

1.2.1. Outside View of Main Frame

Figure1-1 Front side view

Figure1-2 Operation panel

Remote

control

receiver

Foot adjust lever

Front foot

Lens cover

Operation Panel

Lower Case

Upper Case

Menu buton

Esc buton

Volume buton

Video buton

Help buton

Power buton

Computer buton

A/V Mute buton

Shift buton

Sync buton

Tracking buton

Resize buton

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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

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Figure1-5 Main projector unit (back)

Figure1-6 Main projector unit (right side)

Remote control receiver

Lamp case

Foot Rubber

Handle

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1.2.2. Inside view of main frame

Figure1-7

Projection panel

Switch board

Speaker L

Speaker R

Main board assy unit

IF unit

Safety switch

Lamp cover sensor switch

RC receptor board assembly

RC receptor

Thermistor, Lamp

1-7

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1.2.3. Outside View of Remote Controller

Figure1-8 Remote controller

(Front)

(Back)

Inside of cover

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1.3. SPECIFICATIONS

1.3.1. Main unit specifications

Table 1-1

OPTICAL FEATURES

SPECIFICATIONS

Display 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~11.35m

Liquid crystal screen /Drive system

Poly-cilicon TFT (MLA built in) 1.3inch (Diagonal)
EMP-7700 :Full lines, 12phase block series

Pixels

EMP-7700 :786432x3 (1024x768x3)

Focal Lens

Manual Zoom lens F1.7-2.3 (49~63 mm)

Focus adjustment

Manual

Zooming adjustment

Manual(1:Approx1.3)/E zom by remote control(1:Approx4)

Keystone correction ratio

10(Upper) :0(Lower) ~ 5:5 optical axis

Light Source
Life(Lamp inner housing)

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

Brightness

EMP-7700 :3000ANSHm

AUDIO FEATURES

Average brightness uniformity

Typ.85%

Output for internal speaker

Dynamic speaker(3W-8

Ω

) x 2 speaker 3D stereo sound:

50~18000Hz, S/N 85db

Audio out Interface

External speaker 3.5mm Stereo mini-jack
Internal speaker output is stopped when mini-jack is
plugged.
Output signal:0 to 500mvrms
land imperdance:600É¹

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

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

Audio (Computer 1)

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

Audio 2(L/R) interface

REMOTE CONTROL

Wireless 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), 15
degree (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 is
plugged)

VIDEO INPUT/OUTPUT

Computer 1 interface Analog (input)

Host computer RGB output
(0.7Vp-p 75

Ω

/ Mac 0.714Vp-p 75

Ω

)

Computer 1 interface Digital (input)

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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 input
interface (R/cr/Pr, G/Y, B/Cb/Pb, H/CStnc,
VSync)

This terminal is work as RGB Video and compornent Video
input terminal as well, I can switch on OSD menu. (Default
:RGB)
Input signa :Analog RGB Standard level (0.7Vp-p, 75

Ω

,Neg-

ative synchronous0.3V)
Interface Typ :BNC Jack

Monitor OUT interface (output)

EMP-7700 RGB output
Interface type: HD-15pin(DDC1/2B correspondence)

S-Video Interface

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

Video IN Interface

(Composite video interface)

Input signal: 1.0Vp-p,sync.negative 75

Ω

Interface 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 Mouse
USB Mouse
PS/2 Mouse ADB

Mouse/Com1, Mouse/Com2
Auto identification (Mouse)
Interface type: DIN 13pin
Control RS-232C D-sub9

POWER SUPPLY

Input 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 Function

Foot 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

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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.

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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

Terminal

Red video

9(None)

(Pin is not exist)

Green video

Synchronous GND

Blue video

Monitor (ID bit 0)

Monitor (ID bit 2)

SDA

GND

Horizontal synchronization

Red video GND

Vertical synchronization

Green video GND

SCL

Blue video GND

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

Pin

Terminal

Pin

Terminal

Data 2-

Reserved

Data 2+

+5V Power

GND

Reserved

Hot Plug Det

Reserved

Data 0-

DDC Clock

Data 0+

DDC Data

GND

No Connect

Reserved

Data 1-

Reserved

Data 1+

GND

Clock+

Reserved

Clock-

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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 input
Mini DIN 4-pin

Pin

Signal

Function

Pin

Signal

Function

R Out

Red video

Reserved

G Out

Green video

GND

B Out

Blue video

Reserved

GND

H sync

Horizontal sync.

GND

V sync

Vertial sync.

GND

V sync

GND

1 pin: GND
2 pin: Computer audio input L
3 pin: Computer audio input R
The other pins: NC

1,6~9 pin: GND
2 pin: Audio output L
3 pin: Audio output R
5 pin: Detection of Line-out jack insertion
The other pins: NC

1,2,6 pin: GND
3 pin: Y signal input
4 pin: C signal input
5 pin: Input detection terminal

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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 jack
10-pin jack

Signal meanings are different according to the operation mode.

Video in

Audio R

Audio L

1 pin: GND
2 pin: Video input
3 pin: GND
4 pin: Audio R return
5 pin: Audio input L
6 pin: GND
7 pin: Audio L return
8 pin: Audio input R

PS/2

Mouse

USB

Mouse

ADB

Mouse

Serial

Mouse

Serial

(Cross)

Mouse

Pin

Reserved
GND
Reserved
Reserved
Reserved
GND
Reserved
Reserved
DATA
CLK

Reserved
GND
D-
D+
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved

+5V
GND
Reserved
Reserved
GND
Reserved
Reserved
Reserved
Reserved
ADB

DTR
GND
Reserved
Reserved
GND
GND
RTS
RD
Reserved
Reserved

Reserved
TD
RD
DSR
GND
DTR
Reserved
Reserved
Reserved
Reserved

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1.4.9. Remote

3.5mm Stereo mini-jack

1.4.10. Control (RS-232C)

6
5
4
3
2
7
8
9
1

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

PIN

Signal

RD(Received data)

TD(Transmitted data)

DTR

GND

DSR

RTS(Request to send)

CTS(Clear to send)

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Chapter 2 Theory of operation

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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 the
upper level shows the electrical system. (Dotted line inside is the optical system.)

Figure2-1 Hardware block diagram

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2.1.1. Process Outline

1. The video signal is provided to the main board Assy uniy from the IF unit. (Analog signal

should 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 Assy

unit, 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 the

lights from the light guide unit.

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

through the projection lens unit.

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

output from the right and left speakers.

Circut process block

Figure2-2

Optical Process block

Figure2-3

Main board Assy unit

Digital

Analog

A/D

Display

Memory

Display control

IF unit

Display

Speaker R

Speaker L

Driver board Assembly

Display

LCD

Converter

Driver

Light Valves

R/G/B

signal

Audio

signal

AU block

Correction

Projection Lens

Light Valves R

Light Valves G

Light Valves B

Lamp inner

Housing

(Light Source)

Balast Unit

Driver board Assy

Prism (R/G/B sinthesize)

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2.1.2. Electrical System

Electrical units of EMP-7700 are physically connected mainly to the Main board Assy unit as
shown 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, Optical
head (Light valve R/G/B)/Prism unit, and Projection lens unit) as shown next page. These
units and Driver board Assy are specified as Optical engine and it is one replaceable part.

Figure2-4 Optical block

Unit name

function outline

1. 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 overheat
condition), 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 for
the 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, Serial
data transmission

5. Operation panel

Switch (the matrix) signal generation

Optical Head/

Prism unit

Lamp inner Housing

installing location

Projection Lens

Unit

2-5

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Inside view of light guide unit

Figure2-5 Inside of light guide unit

Lamp inner housing Projection lens unit

Figure2-6

Figure2-7

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! Caution:

Take care not to cause any shock or mechanical stress to the optical engine and also not to
disassemble it. Otherwise, the pixel divergence may occur.
The alignment adjustment for each other is applied in the factory, and also electrical correction
is 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 board
assembly are treated as a single unit which is termed the optical engine.(The parts other than
the intake fan and the projection lens unit are not designated as serviceable parts.The optical
engine 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 the
optical engine. The safety switch isolates the AC power supply if the temperature rises above
a certain level (to prevent overheating).

Table 2-1Unit function

UNIT 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

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EMP-7700

SEIKO EPSON

Revision:A

2.3. Power Supply Unit

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

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Revision:A

SEIKO EPSON

(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 is
connected.

• Safety circuit department: Include the thermostat on the AC input circuit. The thermostat

cut 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 signal
of 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 the

AC power supply. This DC voltage are supplied to the sub power supply circuit and ballast
power supply circuit.

• Regulate the DC voltage that is generated with primary regulator circuit with DC-DC

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

• Power Supply fan: The heat that occurred with the power supply unit is radiated. The fan

bios (+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/OFF

of the power supply if the AC voltage is supplied. (It is used to the power ON control circuit
on 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

Tolerance

Input voltage

AC100~240V

AC85~276V

frequency

50 / 60Hz

48~62Hz

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EMP-7700

SEIKO EPSON

Revision:A

Figure2-11

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

Figure2-12

• DC output (CN201/202/203/204)

Table 2-3 Bllast output

Pin No.

Signal name

HGNT (+) Ballast out put (+)

BAHV(-) Ballast out put (-)

Pin No.

Signal

name

Direction

Remarks

Pin No.

Signal

name

Direction

Remarks

+12T

Sub power supply

+5VT

Sub power supply

+5VT

Sub power supply

+5VT

Sub power supply

+3.3T

Sub power supply

GND

+3.3T

Sub power supply

GND

+3.3T

Sub power supply

GND

+3.3R

Main power supply

GND

+3.3R

Main power supply

GND

+3.3R

Main power supply

GND

+11

Main power supply

GND

Main power supply

GND

+18

Main power supply

GND

-7

Main power supply

GND

+13

Main power supply

GND

FANCTL

Fan control

PWON

Main power supply ON/OFF

BLK

WHT

Ballast Output

EMP-7700

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SEIKO EPSON

2.4. Ballast unit

it is the unit that regulates again the DC power supply (DC220-410V/0.8A) for the ballast that
is supplied from the power supply unit to generates the AC power supply (AC45-200V) for the
UHE 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. (The
BACT signal is doing the ON/OFF of the ballast output.) Doing
the modification (the adjustment of the output voltage) of the
switching 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

220IF

Mains
input

Mains
filter

gnd

CB1-3

470 E

CB2-1

ECI-Input

Flag-output

4k7

+5V

CB2-2 CB2-3

10n

CB1-1

Stabiliser

Control

Lamp

Mains Isolation

Commu
tator

Ignlter

Lamp
output

F 450V

Power input

0.5s/a W

4’BYM56

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SEIKO EPSON

Revision:A

(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 power

Input

220~410VDC

260W (max)
3W (At the time of the standby)

output

AC45~200V

220W±4%

EMP-7700

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SEIKO EPSON

2.5. Main Board Assy Unit

The Main board Assy unit controls the center of the product. It consists of CPU, ROM, (Flash
ROM / EE-PROM) video memory, display controller, resizing, and circuits for operation panel
control, 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 audio
output. 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

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(1). Main board Assy unit circuit block

Figure2-16 Main board circuit block

AUDIO

Selector

Address

/ Data

ET6060

DEC Driver

Serial DAC

PC1 Audio

Audio

out

Stereo

Stereo Line Out

SW Board

FAN1

L/V CN

PW364D

Digital

Chroma

SAA7114H

L/V

L/V CN

LCD Drive

Block

LCD Drive

Block

Audio

Controller

TDA7464

Power Amp.

TDA8542AT

TV Audio

Video SW

Sync. SW

PROM

16K

RS-232C

Driver

FAN2

(L/H)

FAN Driver

Locked Det.

Remote 2

Wired

Remote

Remote 1

Video In

CVBS

Y/C

FROM

8Mb

MBM29DL800

(Fujitsu)

Power

Save

Lamp

3.3

,7,12,12F,18,-7V

Power Supply

/Ballast Cntl

AC In

Ballast

Multi

Mouse CPU

PROM

256Kb

LCD Drive

Block

EV9905AA

I/O

Timing

Board

MA Board

Board

PLL/ADC

(3ch)

CXA3516

Video amp.

AD8185

ET1030 Level Shifter

IM2 Audio in

Stereo

LCCOM

Main CPU

FR30

mouse 1

mouse 2

Remote INT

Ballast

Cntl

Lamp

Fail

LED

Board

FROM

8Mb

MBM29DL800

(Fujitsu)

SRAM

1Mb

FAN3

IR Decode

12.5MHz

LED

YUV-RGB

TA1270

ET7040

Color

uniformity

Correction

Driver CPU

EV****

Fan

Cntl

Sync.signal

Processor

BA7078

BNC In

PC In 1

Analog

RGB

PC In 1

Digital

RGB

Digital I/F

TFP401

Sync.signal

Processor

TA1318

PC Out

RGB

I-P

Genesis

gmVLX1A

SRAM

1Mb

9803

DATA

swap

GAUGE2

Gamma

Correction

3.3

,5,12

for IM2

Multi

Mouse CPU

Serial

(control)

FAN4

component

Alw

ys on

off dur

ing

standb

EMP-7700

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SEIKO EPSON

(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 means
of a digital filter.

• Conversion of transmitted IF to digital video signals in accordance with digital video stan-

dards
Allows digital video signals which conform to DVI standards to be received.

• Frequency conversion for input video signals

Converts the frequency of video signals which are input from a PC/video to create LCD
drive video signals.

• Display of sub video signal within the main video signal as a PIP (Picture in Picture) image

Converts 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 you
select.

• 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 video
signals in NTSC format.

• On-screen display function

Displays menus and ELP links which are contained in the input video signal as overlay
images.

• DDC control

Responds to DDC queries from the connected computer.

• Remote control

Receives and decodes remote control signals and uses these signals to control peripheral
circuits.

• Mouse control

Converts 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 control

Controls the ballast and controls the lamp illumination.

• LED control

Controls the various power supply, temperature and lamp indicators.

• Cooling control

Measures the temperature and uses this temperature to control the fan operation.

• Power supply control

Controls the power supply in order to reduce power consumption.

• PC serial interface function

Uses the RS-232C interface to for projector control, uploading and downloading between
the 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 and
C 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 digital
luminance signals (Y, U, V) for displaying in the sub-screen.

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(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 HDTV
compatible.
*Carries out sharpness, tint, brightness,

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 the
various 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 sync

signals and sync on-screen signals which are contained in the computer image signals
into 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 which
have 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 the
operating menu display screen.

• Enables digital filtering of the digital image signals which are input as desired by means of

a programmed internal FIR filter (80 or 160 taps).

• Analyzes the frequency characteristics of the digital image signals which are input and

digitally resizes the signals to the desired size.
(Example: Digitally enlarges and reduces the video signals with various frequencies and
resolutions in NTSC, PAL, SECAM, VGA, SVGA, XGA, SXGA and UXGA formats and
converts 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 display
to the upper frequency which matches the LCD driver specifications to generate the video
signal.

EMP-7700

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SEIKO EPSON

(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 PC
out 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 devices
Main CPU:MB91101PFV-G-BND-R
Decoder 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 to
standby 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 an

analog 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 has

passed through the video amplifier circuit.

• In order to display the picture, the received data is first stored in the frame buffer of the

resizing block where it is resized. The resized data is then output to the driver board
assembly along with a synchronizing signal.

• The video input signal (S-Video/Video) is converted into a digital signal by the digital

chroma processor, and is then stored in the frame buffer.

• The I/O controller (IC1108) outputs four scanning signals to represent operations carried

out at the operating panel. When an operating panel switch is pressed, a scanning signal
passes through the switch contact and then passes through the return signal line. The I/O
controller controls the operation the various projector components based on the return
signal. (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 receptor

board assembly detects a remote control signal, the data in serial format is received by
the IR decoder (IC1507), and the I/O controller uses this to control the operation of the
various 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 source

lamp (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 light

source lamp, press the POWER switch to turn the lamp on. The lamp timer inside the
EEPROM will then be reset automatically.

Table 2-4 Lamp inner housing timer control

Lamp inner housing

Lamp indicator state

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

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

When the lamp inner housing run out before itís life.

The lamp indicator blink in red.

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• The two thermistor circuits (PBS thermistor and LAMP thermistor) detect the temperatures

of the respective parts of the projector. The CPU monitors the thermistor signals once
every 100 ms, and controls the fan and the power supply lamp based on the temperature
state.

• There are five temperature sensors which are mounted on the main board assembly in

order to prevent overheating. If the detected temperature rises above a certain level, the
temperature 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--high
speed) 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 a

wireless remote control for a connected computer.

EMP-7700

2-18

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SEIKO EPSON

2.6. Driver Board Assy

The Driver board Assy has two functions, one is for converting the R/G/B display signal from
the 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

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EMP-7700

SEIKO EPSON

Revision:A

Circuit block diagram of Driver board Assy

Figure2-18

EMP-7700

2-20

Revision:A

SEIKO EPSON

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.

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SEIKO EPSON

Revision:A

2.7. IF Units

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

Figure2-19

CN302

CN300

J300

CN101

J201
J202

J301

CN100

CN201

CN202

EMP-7700

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SEIKO EPSON

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 converter

0~+9V

Amplifier

circuit

Connected to main

board assembly unit

CN1800

CN301

L-OUT/

R-OUT

+12V

SCL5/SDA5/

AJ-DET/

CN1EN/DDC-

CLK/

+5V/-5V

AU-DETECT

IC200

Audio

Serector

Video

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SEIKO EPSON

Revision:A

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

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SEIKO EPSON

2.8. RC Receptor Board Assembly

This assembly is equipped with an element which detects (receives) the infrared signals from
the remote control unit. The RC receptor board assembly is installed to the switch board (at
the 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 (the
serial data) from both receptor board assemblies are an information retrieval decoder and be
converted 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 and
pointers).

2. The serial signal send to the Driver board Assy via the Main board Assy unit performs the

display control (Freeze / Blank/etc.).

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

volume control.

Circuit block

Figure2-22

RC receptor board

assembly

Switch board

RC receptor

Main board Assy unit

Remote

controller

RC Receptor board

Assembly

Receiver

IF unit

CN1006

CN1001

CN1800

CPU

(IC1101)

Address, I/O

Bus controller

(IC1108)

IR decoder

(IC1507)

SDA/SCK

CN302

CN301

Driver board Assy

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EMP-7700

SEIKO EPSON

Revision:A

2.9. Speaker Unit

Two speaker brackets at the left and right of the switch board. (8

Ω

-3W) are equipped inside

the upper case unit, faced upward. The audio input signal from a host computer or AV devices
connected 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 Audio
Out 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 of
the main board assembly, and is then output to the speakers. If the main board assembly unit
detects that if source is connected to the external speaker (Audio Out) terminal, and controls
whether the audio signal is output to the internal speakers or to external speakers (Audio Out).

Speaker L

Speaker R

EMP-7700

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SEIKO EPSON

2.10. Light Guide Unit

The light guide unit eliminates ultraviolet rays which are harmful to the light valve and uniforms
the 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 the
block. The below photograph show the appearance and the internal block of the light guide
unit (Do not disassemble the light guide unit in the field maintenance).

Figure2-25 Light guide unit

(1). Lens Array Lens Array A/B

Dispersion of the light from the lamp inner housing by the Lens Array lens array A/B
roughly uniform the brightness. The UV filter coated on the surface of the multi-lens array
eliminates 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

Mirror

PBS adjusting Screw

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EMP-7700

SEIKO EPSON

Revision:A

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

(3). GDM

GDM is a light filter looks blue in the visual light. The GDM filter transmit only the blue light
from the light source. Since the input light to the GDM is only blue and green lights by the
CDM as described above, green light is reflected by the GDM and provided to the light
valve G.

(4). Condenser Lens

The condenser lens collects the light and provide to the next process.

(5). Condenser Lens R/G/B

To 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

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SEIKO EPSON

2.11. Lamp Inner Housing

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

Figure2-26

1. The light source lamp
The 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 Main
board 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 an

orange color. If the indicator starts flashing orange, it means that the lam has reached the
end of its useful life, and it should be replaced as soon as possible. If the lamp is used
after the cumulative usage time reaches 1,400 hours, the message "Please replace the
projector 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

2-29

EMP-7700

SEIKO EPSON

Revision:A

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. The
terminal sections placed on the both ends of this board touch the FC board installed on the
back of the light guide unit. The cable of the FC board is connected to the connector CN2 on
the Driver board Asembly, so the signal from FC board is sent to the Main board Assy unit via
the connector CN100 on the Driver board asssembly. When it is new or changed to a new
one, “LSTAT” signal to I/O decoder on the Main board Assy unit becomes high. (+5VA on the
Driver board assembly pulls up “LSTAT” signal line through the FC board and the fuse on the
FUSE 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, and
connects “LSTAT” signal line to the ground through a resistance. Consequently, the fuse on
the 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

FC board

Lamp inner

housing

FUSE board

Driver board

CN2

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)

Main board Assy unit

Lamp

CN1001

CN1003

CN1000

EMP-7700

2-30

Revision:A

SEIKO EPSON

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 of
MENU display.

Exceed 1,400 hours

Blink in orange

Clear the
EE-PROM with
lamp replacement.

After the power on,
“Exchange lamp” message
appear 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 with
EMP-5500

Keep total running
hours with EMP-7500.

Ensure with information of
MENU display.

Lamp exchange times

Keep exchange times.

Ensure with information of
MENU display.

2-31

EMP-7700

SEIKO EPSON

Revision:A

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

Wait

30sec

Lamp off

Error handling

Lamp off

(LPCTL signal off)

Driver board

Assy initialize

Main board

Assy unit

initialize

Lamp on

(LPCTL signal on)

Rotate the fan

Terminate the following
lamp on sequence

Ballast power supply start

LPSTC signal (Lamp abnormal) OFF

Wait

500ms

Wait

4Sec

Power

Lamp on?

Three times?

Overheat or

Sensor error

EMP-7700

2-32

Revision:A

SEIKO EPSON

2.12. Sensor / Switch

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

Figure2-29 Sensor/Switch

Table 2-6 Sensor/switch

Name

Location/Type

Function/Use

Lamp

cover

sensor

switch

Pushbutton switch on middle case
reinforcement plate

AC power off, in opening the lamp
cover unit.

Safety switch

On the lamp outer housing
(Thermal switch )

Overheat protection for lamp inner
housing area. (AC power off.)

LAMP thermistor

On the lamp outer housing

Overheat protection for light source
lamp area.

Lamp cover sensor

switch

Safety switch

LAMP Thermistor

2-33

EMP-7700

SEIKO EPSON

Revision:A

2.12.1. Lamp cover sensor switch

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

Figure2-30

Lamp cover sensor

switch

EMP-7700

2-34

Revision:A

SEIKO EPSON

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. The
safety 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 the
temperature increase to certain degrees, every regulating operations of the power supply unit
are 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 the
thermistor 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 thermistors
and five temperature sensors in each 100ms. Five of temperature sensors are placed on the
Main board Assy Unit and detect the temperature of major circuit. three of thermistors are
placed 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 down

Medium-

low

Medium-

high

High

Warning

∆∆∆∆

Thermistor

Arround LH

Temperature
sensor

Arround L/V

Arround
CXA3516

Arround
PW364D

Arround LH

LAMP Thermistor

Safety Switch

2-35

EMP-7700

SEIKO EPSON

Revision:A

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 thermistor
Two thermistors are combined with connector and treat as one parts. Lamp thermistor is
mounted with screw on the lamp outer housing (closed to safety switch) and detect the tem-
perature of lamp area.

Table 2-7 Temperature indication

Condition Temperature

indicator

Meaning

Normal temperature

Off

Operating in the normal condition

Warning temperature

Blink in orange
Red

Projection 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

2-36

Revision:A

SEIKO EPSON

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

2-37

EMP-7700

SEIKO EPSON

Revision:A

(1). Control block diagram of fan

Figure2-36 Fan control block

! Caution:

Low-Speed operation occurs only during standby (except when a temperature warning has
occurred) 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 power
off.

• Fan drive bias for intake fan and exhaust fan are regulated at the driver circuit (consist from

regulator and transistor circuit) according to the fan control signal from CPU on the Main
board 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 Fan

FCTL01

1: Slow (10.0V)

0: Fast (12.0V)

FCTL00

1: Run

0: Stop

FRS1

1: Run

0: Stop

FRS0

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: Stop

FRS2

1: Run

0: Stop

Lamp Fan

FANCL

1: Slow

0: Fast

Regurator

(12V_F)

FRS2

2.5A

13V

Controller

IC1108

CPU

IC1101

Regurator

IC1400

Main board Assy unit

1400

1401

1002

Regurator

IC1401

Intake Fan

Lamp Fan

FRS1

FRS0

FCTL21

FCTL20

FCTL01

FCTL00

Exhaust Fan

r Supply unit

CN1800

EMP-7700

2-38

Revision:A

SEIKO EPSON

(3). Fan operation

• Stand by:

Turn on the fan regurator then drive the intake fan1/2 and exhaust fan with slow mode
when the thermistor detect the temperature of “Slow“ level or temperature sensor detect
the 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 down

After the lamp “Fast“ condition until the thermistor and temperature sensor detect the
below level of “Slow“.

2-39

EMP-7700

SEIKO EPSON

Revision:A

2.14. LED indicator

Three of indicators are mounted on the Switch assembly board unit and indicate the machine
operation 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

Meanings

Orange

Green

Red

Green

Red

Green

Red

OFF

Standby mode(Sleep mode)

Blink 1

OFF

Lamp warm-up

OFF

Lamp on

Blink 1

OFF

Cool down mode

OFF

Blink 1

OFF

Blink 1

Bas error (Circuit malfunction)

OFF

Blink 1

OFF

Warning for lamp life (during lamp on)

Blink 1

OFF

Blink 1

OFF

Warning for lamp life (during warm-up)

Blink

OFF

Warning for lamp life (during cool
down)

OFF

Blink 1

Warning for lamp life and overheat
(during lamp on)

Blink 1

OFF

Blink 1

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

Blink 1

Warning for lamp life and overheat
(during cool down)

OFF

Lamp life

OFF

Blink 1

OFF

Lamp or ballast power defect

OFF

Blink 2

OFF

Lamp fuse defect

OFF

Blink 1

Overheat operation (Lamp on)

Blink 1

OFF

Blink 1

Overheat operation (Warm-up)

Blink 1

OFF

Blink 1

Overheat operation (Cool down)

OFF

Overheat

OFF

Blink 1

Fan defect

OFF

Blink 2

Sensor defect

Temperature indicator

Lamp indicator

Operation indicator

EMP-7700

2-40

Revision:A

SEIKO EPSON

2.15. Operation Panel (Upper Case Unit)

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

Figure2-38 Operation Panel

Chapter 3 Disassembly and assembly

EMP-7700

3-2

Revision:A

SEIKO EPSON

3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES

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

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

in contact with the equipment.

2. Wear gloves.
3. Wear a wrist band and ground it. Place a ground mat.
4. Turn off the 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 accessories
Prepare the tools and accessories listed in the table below.

(3). Limitation of disassembly (Optical engine handling)
The disassembly of the mechanical section is detailed in paragraph 3.2. The optical engine is
one 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 except
for 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

Use

Phillips screwdriver 2

Market

Dissasemble the case and interiors

(-)Phillips screwdriver

Market

Remove lamp cover and air filter cover

Tweezers

Market

Unlock the FPC connnector on D.R board

Brush

Market

Burush off the dust around fan

Vacuum cleaner

Market

Clean the fan and filter

Paper wiper

Some

Market

Clean the projection lens

Air blower

Market

Clean the fan and filter.

Glove

Market

Avoide finger injury

Wrist band,Groung map

Market

Avoide electro ststic influence

Driver Six corner (5mm)

Marker

For the D-Sub fixed screw

Driver Six corner (5.5mm)

Marker

Removing the spacer

Torx screwdriver (H10)

Marker

Removing the upper case unit

Table 3-2

Optical head unit

These units are specified as “Optical
engine”.
(Treat as one replaceable part in the
field maintenance.)

Prism unit

Light guide unit

Driver board Assy

3-3

EMP-7700

SEIKO EPSON

Revision:A

Mechanical adjustments for optical engine.

1. Optical Head Unit
The alignment (height/left and right/concurrent) of the polarization plates (include R/G/B light
valves) is applied in the factory. If the alignment is modified, clear color image will not be
made, because of the color divergence.

! Caution:

Do not apply any mechanical stress and also not loosen the screws.

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

! Caution:

Do not loosen the prism unit fixing screws.

3. Light guide unit
The alignment of the light guide unit on the optical head unit is applied (gap and concurrent to
the polarization plate) in our factory. If the alignment is modified, clear image will not be made,
because of being out of the brightness uniformity on the display screen (brightness or chroma
is 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 the
display 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, the
alignment of lenses or mirrors may be unintentionally changed and also dust may stick to the
unit.
Since Optical engine on the EMP-7700 requires very precise adjustment, it can not be
adjusted 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 for
the display signal is slightly different from the output driver of other device (Driver Board
Assembly) 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 mechanical
adjustment but the electric correction is required. For this reason some correction values are
written 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 driver
board 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 Driver
Board 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 are
necessary, therefore it can not adjust in the field.

EMP-7700

3-4

Revision:A

SEIKO EPSON

(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 are
given below.
As you disassemble the main unit, dust that is sticked to the internal fans and air filters is likely
to migrate and contaminate the light valves R, G, and B which are the heart of the display
mechanism, thus deteriorating the display quality.
Accordingly, before reassembling, check the dust inside of the main unit and, if necessary,
clean them with a vacuum cleaner.
The light valves R, G, and B and circuit board assemblies are highly sensitive to static 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 pertinent
unit 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 electromagnetic
media such as floppy disks and magnetic cards.

Handle the optical engine(projection lens and light guide units) with care as they are highly
susceptible 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.

3-5

EMP-7700

SEIKO EPSON

Revision:A

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 reverse
order of disassembly, unless specifically specified, this manual contains no reassembly proce-
dure. Detailed descriptions of the disassembly procedures are given in subsections 3.2.1
through 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 switch

Thermistor 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)

(P3-14)

(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 unit

Lower case unit

(P3-20)

(P3-21)

RC receptor board

assembly

Auxiliary duct unit/

Lamp fan unit

(P3-15)

(P3-9)

EMP-7700

3-6

Revision:A

SEIKO EPSON

3.2.2. Lamp Cover Unit

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

main unit.

Figure3-2

Screw

Lamp cover

3-7

EMP-7700

SEIKO EPSON

Revision:A

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 is
used.
When installing the Lamp Inner Housing, take care not to touch the lamp’s reflector with a
hand (to prevent the reflector flom being contaminated).

Lamp inner housing

Screw

EMP-7700

3-8

Revision:A

SEIKO EPSON

3.2.4. Upper Case Unit

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

of the arrow.

Figure3-4

Upper case unit

3-9

EMP-7700

SEIKO EPSON

Revision:A

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

3-10

Revision:A

SEIKO EPSON

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 middle

case 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

Stopper bracket

3-11

EMP-7700

SEIKO EPSON

Revision:A

3.2.8. Middle case L2 unit

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

case L2 unit.

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

then remove the middle case L2 unit from the lower case.

Figure3-8

Middle case L2 unit

EMP-7700

3-12

Revision:A

SEIKO EPSON

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 and

the ballast unit, and then the ballast unit can be removed.

Figure3-10

Lamp connector presser

Ballast unit

IF unit

3-13

EMP-7700

SEIKO EPSON

Revision:A

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

Plate 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

3-14

Revision:A

SEIKO EPSON

3.2.10. Thermistor LAMP

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

Thermistor 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

3-15

EMP-7700

SEIKO EPSON

Revision:A

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 Unit

1. 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 engine

3. 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

3-16

Revision:A

SEIKO EPSON

3.2.14. Intake Fan/Exhaust Fan

1. Remove the intake fan and exhaust fan guards which are at the bottom of the optical

engine. 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

3-17

EMP-7700

SEIKO EPSON

Revision:A

3.2.15. Projection Lens assembly

1. Remove four screws(Screw, HSH M4x8) fixing the Projection Lens by using exclusive use 4

corner 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

3-18

Revision:A

SEIKO EPSON

3.2.16. Replacing the attachment lens

• Attachment lens removal

While pressing the attachment lens lever, turn the attachment lens in the direction of the
arrow.
When the attachment lens cannot be turned any further, pull it forward. When removing
the attachment lens, turn it gently to the left and right to make removal easier.

Figure3-21

• Attachment lens installation

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

Figure3-22

3-19

EMP-7700

SEIKO EPSON

Revision:A

3.2.17. Middle case R unit

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

unit, 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

3-20

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SEIKO EPSON

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 the

lower case.

Figure3-25

3.2.19. Power supply unit

1. Remove the five screws (+, Capco, 3x6, F/Zn) and the screw (+, standard pan-head, sems

B, 4x6, F/Ni) for securing the ground, and the two hexagonal head screws, and then remove
the power supply unit from the lower case.

Figure3-26

3-21

EMP-7700

SEIKO EPSON

Revision:A

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 & L

Front cushion unit

EMP-7700

3-22

Revision:A

SEIKO EPSON

Chapter 4 Troubleshooting

EMP-7700

4-2

Revision:A

SEIKO EPSON

4.1. Before Starting Troubleshooting Procedures

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

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

2. If you find questions you want to check while examining the flowchart, be sure to check

those items during the troubleshooting procedure.

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

component 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 listed
below. 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, and
screws, 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 unit
and 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 4-1

Name

Quantity

Use/Remarks

Screen

To project images

Rule (3 m)

To measure the projection distance

Host computer

To supply test patterns (PC or compatible)

Color display monitor

To manipulate and display on host computer

Video equipment

To test video input
(video deck, video camera, etc.)

External speaker unit

To test voice output (with audio cable terminals)

Multi-meter

To measure resistance and voltage (AC/DC)

Tool set

1 set

Tools and accessories listed in Section 3.1

4-3

EMP-7700

SEIKO EPSON

Revision:A

4.2. Entry

Follow the flowchart shown below when starting troubleshooting EMP-7700 problems and
proceed 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/Com

interface 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

4-4

Revision:A

SEIKO EPSON

Outside view

Turn 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 housing

frame 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?

4-5

EMP-7700

SEIKO EPSON

Revision:A

Internal cable connections

Before 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

Lamp cover sensor switch

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

• CN1402 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

• CN1001 on the MA board

EMP-7700

4-6

Revision:A

SEIKO EPSON

Power ON / OFF

Figure4-4

Start

Press Power button on

the Operation panel.

Operation indicator

becomes 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 on

the safety switch.

• Measure the safety switch

resistance.

Replace AC power

Go to start

Filter unit A

Press Power button by
the Remote controller .

Operation indicator

becomes lights in green?

Replace Vacuum fan

Does exhaust fan

move?

Replace applicable

power supply unit.

Replace Exhaust fan

Dose Exhaust fan

move?

Safety switch

resistance is nearly

zero ohm?

Fixed?

Go to start

Replace MA board

Replace power supply

unit A

Replace MA board

Replace Safety switch

Yes

4-7

EMP-7700

SEIKO EPSON

Revision:A

Figure4-5

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 (Intake

fan, Power supply fan,

Exhaust fan)

Fixed?

Operation indicator

becomes blink in red?

Lamp and temperature

indicators are off?

Lamp indicator become

blink in orange?

Lamp indicator is it turn

off.

Replace MA board.

Warning for lamp life.

Press power button

(Off)

Operation indicator

becomes blink in orange?

Wait 60 sec

Operation indicator becomes

lights 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

LAMP thermistor

Yes

Normal and Go to

next page.

Temp indicator becomes

blink Orange?

EMP-7700

4-8

Revision:A

SEIKO EPSON

Display / Pictuer quality

Figure4-6

Does “NO SIGNAL” message

appear on the screen?

Replace MA board.

Does “NO SIGNAL” message

appear on the screen?

Replace Optical engine.

Does fine image appear by

adjusting focus and zoom ring.

Press Menu button on the

switch panel or remote

controller.

Does Menu screen appear?

Take the adjustment shown

in the table 1.

Does fine image appear?

Replace MA board.

Does fine image appear?

Take the adjustment shown

in the table 1.

Does fine image appear?

YES

Replace optical engine.

Start

Does screen appear?

Lamp indicator becomes

blink in red?

Replace Lamp inner housing.

Does light source lamp on?

Replace MA board.

Reconnect the cable connector on

the CN1003(MA board) to Ballast

unit.

Does light source lamp on?

Replace Ballast unit A.

YES

Go to

next page.

YES

Lamp indicator becomes

lights or blink in red?

Replace the following

thermistors.

1.PBS

2.LV 3.LAMP

Does light source lamp on?

YES

Computer In
1/2

Video In/
S-Video

Brightness
Contrast
Synchroniz
ation
Tracking
Color

Brightness
Contrast
Saturation
Tint
Sharpness

! Caution:

Even the picture quality defectiveness that originates from
condensation or dirt of lens is conceivable. In case of con-
densation, it becomes normal naturally if it leaves for a
while.

4-9

EMP-7700

SEIKO EPSON

Revision:A

Continued from page 4-7

Figure4-7

Replace optical engine.

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

Does following devices are

checked?

Video In
S-Video In

Connect the proper device

which are not checked.

Connect the CRT to the

Computer Out interface.

Does screen appear on the

CRT?

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

EMP-7700

4-10

Revision:A

SEIKO EPSON

Audio out

Figure4-8

Connect the audio cable to

the Audio In interface.

Does A/V devices are

checked?

Connect the audio

cable to the Audio In

L/R interface.

Does internal speaker R/L

output the sound?

Start

YES

Does external speaker

output the sound?

Does Mute button works?

Connect the external

speaker to the Audio out.

Does internal speaker R/L

output the sound?

Does internal speaker R/L

output the sound?

Does volume control

works?

Replace speaker R/L.

Replace MA board

Replace MA board.

Go to Operator panel.

Replace MA board.

Re-connect the CN201/202

on the MA board.

4-11

EMP-7700

SEIKO EPSON

Revision:A

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 button

works?

Does Tracking +/- button

works?

Does Video button Works?

Does ESC button works?

Does Key stone button

works?

Does Shift +Volume button

works?

YES

Go to Remote controller.

Reconnect cable connector
on the CN502 of MA board.

Does all button works?

Speakers.

EMP-7700

4-12

Revision:A

SEIKO EPSON

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.

Does power ON/OFF are

available?

Re-connect RC receptor

cable.

Does power ON/OFF are

available?

Replace RC receptor.

Does power ON/OFF are

available?

Replace MA board.

Does power ON/OFF are

available?

Replace RC receptor cable.

YES

Start

Does power ON/OFF are

available?

Go to

others

4-13

EMP-7700

SEIKO EPSON

Revision:A

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

EMP-7700

4-14

Revision:A

SEIKO EPSON

EMP-7700

SEIKO EPSON

Revision:A

Index

Accessory specification 1-9

Ballast unit

Circuit Block 2-10

Input/output specification 2-11

Process outline 2-10

Disassembly flow chart 3-5

Driver Board Assembly

Electrical System

Inside view of main frame 1-6

Interface Specification 1-11

Lamp Inner Housing 2-28

Circuit block 2-29

Lamp on sequence 2-31

LED indicator 2-39

Light Guide Unit 2-26

Main Board Assy Unit

Circuit block 2-13

Function outline 2-14

Process Outline 2-16

Main unit specifications 1-8

Operation Panel 2-40

Optical system block 2-2

Power Supply Unit 2-7

Circuit block 2-7

Outline of function 2-8

Process Outline

Circut process block 2-3

Optical Process block 2-3

Projection image size 1-2

Protection From

Accidental Injuryobstacles 0-3

Accidents 0-3

Electric Shock 0-3

RC Receptor Board Assembly 2-24

Record of Revisions 0-2

Remote Controller 1-7

Resolution 1-2

Sensor / Switch 2-32

Interlock Switch 2-33

Safety Switch 2-34

Thermistor and temperature

sensor 2-34

Speaker Unit 2-25

Tools and accessories

For Disassembly and assembly 3-2

For Troubleshooting 4-2

Trademark 0-1

VCCI rules 0-1

Document Outline

INTRODUCTION
PRECAUTIONS
Chapter 1 Product general
Chapter 2 Theory of operation
Chapter 3 Disassembly and assembly
- 3.1. DISASSEMBLY AND ASSEMBLY PROCEDURES
- 3.2. DISASSEMBLING THE MAIN UNIT
Chapter 4 Troubleshooting
- 4.1. Before Starting Troubleshooting Procedures
  - 4.1.1. Tools and Accessories Required for Troubleshooting
  - 4.1.2. Field Replacement Parts
- 4.2. Entry

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Document Outline