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Multi Media Projector
Service Manual
EMP-720(XGA) EMP-730(XGA)
EMP-720,EMP-730
INTRODUCTION
This Service Manual describes of the hardware information which is necessary for the smooth field service of the Multi Media PROJECTOR EMP-720/EMP-730 and the trouble shooting. As the primary technologies modification will be supplied with the Technical Information bulletins, you may update this manual. Since the service manual describes the topics which may be required in the field maintenance, you may utilize this for repair or diagnosis of failures. The contents are as following. Before you start the maintenance service, read every safety precautions and observe safety precautions and observe safety rules. precautions : SAFETY,MAINTENANCE,PERSON chapter 1 : GENERAL (PART NAME, SYSTEM FUNCTION, SPECIFICATION, etc...) chapter 2 : THEORY OF OPERATION (HARDWARE,INTERNAL CONNECTION, FUNCTION OF UNITS, etc...) chapter 3 : TROUBLE SHOOTING chapter 4 : DISASSEMBLE & ASSEMBLE (ASSEMBLY PROCESS FOR MAIN FRAME)
HOW TO USE THE SERVICE MANUAL
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 instructions, may cause interference to radio and television reception.
TRADEMARK NOTICES
EPSON is the trademark of SEIKO EPSON CORPORATION. 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. 2002 SEIKO EPSON CORPORATION
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Manual Revision History
History REV. A Mar. 25, 2002 Date Initial draft Detail of change
Service memo
Make a note here of important technical information from Technical Information bulletins.
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SAFETY INSTRUCTIONS
1. MAINTAINING OPERATOR SAFETY
(1). PREVENTING ELECTRIC SHOCKS · Turn off the power switch and disconnect the power cord from the AC outlet before carrying out any disassembly and assembly work on this projector. · If power needs to be supplied to the projector while the cover is removed (such as when making adjustments), take off any metallic objects such as wristwatches, shirt cuff buttons, rings and tie pins which may pose the danger of coming into contact with the projector. (2). PREVENTING INJURY · Projector components such as the lamp inner housing and the area around it may still remain hot after the power has been turned off, even when the cool-down period is compete. Furthermore, if removing the cover in order to carry out adjustments while power is being supplied to the projector, be careful not to touch the fans (intake and exhaust). · Always wear gloves when disassembling and reassembling the scanner in order to avoid injury from metallic parts with sharp edges. · Do not look directly into the projector's lens while power is being supplied to the projector, otherwise injury to the eyes may occur. (3). PREVENTING ACCIDENTS · Place the projector on a stable, level surface when carrying out any repair or adjustment work, to prevent the projector and its components from slipping and falling down. Furthermore, do not place any tools or projector components on top of or underneath the projector. · Avoid working on the projector in places where other people might receive injuries from touching the projector while it is in a state of disassembly. Furthermore, do not leave the projector unattended in the workplace at such times. · When turning on the projector's power, always use the accessory power cord to connect the projector to the power supply, and always make sure that the power supply is properly grounded.
2. MAINTAINING THE PROJECTOR IN GOOD CONDITION
(1). PREVENTING STATIC ELECTRICAL DAMAGE · When disassembling and assembling the projector, always use a grounding strap and a grounding mat. Furthermore, when replacing electrical circuit components (such as circuit boards and optical engine), touch the static-proof bag containing the new parts against a metallic section of the projector before removing the component from the static-proof bag. (2). USE OF GENUINE PARTS · When replacing the structural components inside the projector (including the lamp inner housing), use only replacement parts supplied by EPSON and listed in the projector's Parts List. · Use the accessory power cord and interface cable provided with the projector. (3). SAFETY TESTING · The following tests should be carried out on repair parts used in the LCP. (3-1).Test items · Insulation resistance test · Ground continuity check · Illumination check
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(3-2).Testing procedure Carry out testing in the order given below.
Repair Insulation resistance test Illumination check End
Safety inspections
(3-3).Testing methods 1). Insulation resistance test Testing apparatus: Insulation ohmmeter (Rating: 500 V/100 M) Check item Insulation ohmmeter settings
Line terminal Ground terminal Display 1. Set the range selection switch to 500 V. 2. Connect the black lead wire to the ground terminal. 3. Connect the red lead wire to the line terminal. 4. Connect the black lead wire (crocodile clip) to c in order to measure the insulation resistance (1) (between a and c) in the diagram below. 5. Next, insert the probe of the red lead wire into a. 6. Set the measure switch to LOCK, and then measure the insulation resistance after 1 minute. 7. Check that the insulation resistance after 1 minute is 10 M or more. 8. Next, measure the insulation resistance at (2) (between b and c) in the diagram below in the same way as for (1). 9. Check that the insulation resistance at (2) after 1 minute is 10 M or more.
Inspection method Insulation ohmmeter
Standard/Judgment level Insulation resistance should be 10 M or more
Measure switch
a
Range selection switch Power supply lines
b
(1) Projector AC inlet (2)
! Caution: Because high voltages (500 V) are present, do not touch the probe during testing.
c
Exposed metal part of projector
Computer IN connector
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2). Other · Check that the connectors at both ends of the power cord are not dirty or bent, and clean them if they are dirty. Furthermore, if there is any noticeable discoloration on the power cord, it should be replaced (to prevent the chance of fire due to flashover). · When connecting the connector cables and interface cables inside the projector, make sure that the cable connectors are pushed on as far as they will go. · To prevent problems caused by dirt getting into the optical system, always disassemble and assemble the projector in an area which is free from floating dust. · When disconnecting the FPC cable of the control panel from connector CN703 on the MA board, release the connector lock first. (When releasing the connector lock, use tweezers or similar to push up both sides of the connector at the same time.)
CN703 enlarged view
Locked
CN703
Unlocked
· When disconnecting the three FPC cables for the light valves from their connectors, release the connector locks first.
Locked Unlocked
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3. NECESSARY REQUIREMENTS FOR SERVICE TECHNICIANS
· Service technicians who carry out repairs and servicing work on the EMP-720/EMP-730 must possess the following knowledge and abilities. · The service technician must have read and fully understood the contents of this Service Manual (such as the working procedures). · The service technician must have a fundamental knowledge of working with electricity (safety procedures, knowledge regarding electrical circuits, and knowledge regarding static electricity). · Any questions regarding repairs and service to this projector (such as supply of parts and the contents of this Service Manual) should be directed to EPSON at the address below. Furthermore, information regarding matters such as technical changes to the projector are released when necessary in the form of Technical Information bulletins, and these should be referred to also. SEIKO EPSON CORPORATION ADDRESS 4897 SIMAUCHI,MATSUMOTO-SHI, NAGANO-KEN,390-8640 JAPAN TEL. 81-263-48-5437 FAX. 81-263-48-5680 SECTION Visual Device Customer Support Group
4. OTHER
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Chapter 1 Product General
1.1. PRODUCT GENERAL ............................................................................ 1-2 1.2. PART NAME ........................................................................................... 1-3 1.2.1. Exterior ............................................................................................ 1-3 1.2.2. Internal components........................................................................ 1-5 1.2.3. Remote control ................................................................................ 1-6 1.3. SPECIFICATIONS .................................................................................. 1-7 1.4. INTERFACE SPECIFICATIONS............................................................. 1-9 1.4.1. Computer 2 / Component Video Interface....................................... 1-9 1.4.2. USB Mouse Interface .................................................................... 1-10 1.4.3. Composite Video Interface ............................................................ 1-10 1.4.4. S-Video Interface........................................................................... 1-10 1.4.5. Audio In (Computer Audio Input) Interface.................................... 1-11 1.5. EXTERNAL VIEWS .............................................................................. 1-12
Chapter 2 Theory OF Operation
2.1. OVERVIEW OF HARDWARE................................................................. 2-2 2.1.1. Circuit System Component Connection Diagram............................ 2-3 2.1.2. Circuit Block .................................................................................... 2-4 2.1.3. Optical Engine ................................................................................. 2-5 2.2. POWER SUPPLY UNIT .......................................................................... 2-8 2.3. BALLAST UNIT ..................................................................................... 2-11 2.4. MA BOARD ........................................................................................... 2-12 2.5. CONTROL PANEL................................................................................ 2-16 2.6. RC RECEIVER SENSORS ................................................................... 2-17 2.7. SPEAKER ............................................................................................. 2-18 2.8. TEMPERATURE CONTROL ................................................................ 2-19 2.8.1. Sensors and Switches................................................................... 2-19 2.9. FAN OPERATION................................................................................. 2-21 2.10. LED INDICATORS .............................................................................. 2-23
Chapter 3 Troubleshooting
3.1. BEFORE CARRYING OUT TROUBLESHOOTING ............................... 3-2 3.1.1. Troubleshooting Tools and Equipment............................................ 3-2 3.1.2. Field Replacement Parts ................................................................. 3-2 3.2. ENTRY.................................................................................................... 3-3 3.2.1. Exterior Checking ............................................................................ 3-4 3.2.2. Internal Cable Check....................................................................... 3-5 3.2.3. Power Supply ON/OFF.................................................................... 3-6 3.2.4. Display input/output and image quality............................................ 3-7 3.2.5. Audio output .................................................................................... 3-9 3.2.6. Control panel ................................................................................. 3-10 3.2.7. Remote control operation .............................................................. 3-11 3.2.8. USB Mouse ................................................................................... 3-12 3.2.9. Other ............................................................................................. 3-13
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Chapter 4 Disassembly & Assembly
4.1. DISASSEMBLY AND ASSEMBLY.......................................................... 4-2 4.2. PROJECTOR DISASSEMBLY AND ASSEMBLY .................................. 4-5 4.2.1. Lamp Inner Unit............................................................................... 4-6 4.2.2. Air Filter ........................................................................................... 4-7 4.2.3. Cover,R.Control............................................................................... 4-7 4.2.4. Foot Unit.......................................................................................... 4-8 4.2.5. Case,Front....................................................................................... 4-8 4.2.6. Case Unit,Upper.............................................................................. 4-9 4.2.7. Shield Plate;MA............................................................................. 4-10 4.2.8. Main Board .................................................................................... 4-11 4.2.9. Fixing Plate Unit,IF ........................................................................ 4-13 4.2.10. Exhaust Fan Unit......................................................................... 4-14 4.2.11. Thermistor Lamp ......................................................................... 4-15 4.2.12. Fan,Exhaust ................................................................................ 4-16 4.2.13. Optical Engine ............................................................................. 4-16 4.2.14. Focus Ring .................................................................................. 4-18 4.2.15. Projection Lens............................................................................ 4-18 4.2.16. Intake Fan Unit ............................................................................ 4-19 4.2.17. Fan.Intake, Printed Circuit Board Assembly;RC,2 ...................... 4-19 4.2.18. Power Supply Fan ....................................................................... 4-20 4.2.19. Power Supply Unit, Ballast Unit................................................... 4-21 4.2.20. Switch,Detect,Lamp Cover.......................................................... 4-22 4.2.21. Speaker ....................................................................................... 4-23 4.2.22. Fan,Lamp PBS ............................................................................ 4-24 4.2.23. Sheet,Exhaust Duct..................................................................... 4-24
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Chapter 1 Product General
EMP-720,EMP-730
1.1. PRODUCT GENERAL
The EMP-720/EMP-730 Multi Media Projector is designed for portability. This XGA projector offers color projection for personal computer and video players (video decks, video cameras, video disk players), all in a compact package about the size of a book. Features of the Projector · Compact and lightweight for greater portability The projector has a compact body with a footprint the size of an B5 page (190 (D) x 276 (W) x 70 (H) mm) and is light in weight (approximately 1.9 kg). · Bright, attractive images A compact, high-luminance lamp inner housing (UHE-150W) and optical block allow the projector to project images at a brightness of up to 2000 lm (EMP-730) or 1500 lm (EMP720). · Full-color, high-resolution capabilities The projector has three transparent LCD panels (R, G and B), each with 786,432 pixels which can project images at resolutions of up to 1024 x 768 dots (2,359,296 pixels). · Quiet operation The projector produces a low 40 dB during normal operation. · Shorter cool-down time Cool-down is completed in 30 to 45 seconds after the projector is turned off. · Functions for Enhancing Projection (1). Easy to Operate The remote control can be used for operations such as Freeze and E-Zoom. It can also be used to move the pointer around on the computer screen during projection, or to carry out operations such as moving to the next page to be projected. When not using the remote control, it can be stored in the back of the projector. (2). Automatic keystone correction The projector senses the amount of up or down projection angle and automatically corrects keystone image distortion. (3). Automatic setup When projecting a computer image, the projector detects the signal from the connected computer and automatically adjusts to the optimum projection conditions. (4). Color mode Six operational categories are offered so that Color adjustment selecting one of them will optimize image projection for a particular situation. Adjustment for color problems is no longer necessary. · sRGB · Normal · Meeting · Presentation · Theater · Amusement
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1.2. PART NAME
1.2.1. Exterior
· Main unit
Zoom ring Focus ring
Warning indicator Power indicator Control panel
Foot unit Air exhaust vent
Lens cover Remote control receiver Foot unit Foot adjust button Air filter Security lock
Figure1-1
Suspension bracket fixing points (3 points)
Caver,Lamp
Figure1-2
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· Control panel
Power
[Power] Button
Help
[Help] Button
Source
[Enter] Button
Keystone
[Keystone] Buttons
Enter
Select
Figure1-3
· Input and output connectors
Video port S-video port Audio-In port Remote control lightreceiving area
Power inlet
Speaker
Computer/ Component video port Cover,R.Control
USB port
Figure1-4
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1.2.2. Internal components
MA board
Fan. Intake R Fan. Intake G
L/V thermistor
Power supply unit Ballast unit
Fan, Exhaust LAMP thermistor Speaker
Optical engine
Figure1-5
Control panel
Figure1-6
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1.2.3. Remote control
· Remote control
[Page up]/[Page down] Buttons When using the remote control as a wireless mouse, press these buttons to scroll back and forth through pages when projecting a PowerPoint presentation Remote control transmitter Outputs infrared remote control signals. [Power] Button Turns the projector power on and off.
Page down Page up
[Source] Buttons [Computer]: Switches the signal source to the images being input from the Computer/Component video port. [S-Video/Video]: Changes the video input source between the S-Video and Video ports. [Menu] Button Displays or hides the menus. [E-Zoom]( ) Button Reduces the size of images that have been enlarged using the [ button. ]
Power
Color Mode
[Color Mode] Button Selects the color mode. The color mode changes in the order of Normal, Meeting, Presentation, Theater, Amusement and sRGB each time the button is pressed.
Computer
S-Video/Video
Menu
A/V Mute
Freeze
[A/V Mute] Button Momentarily turns off the audio and video. [Freeze] Button Keeps the current computer or video image on the screen. [E-Zoom ( )] Button Enlarges the size of images without changing the size of the projection area. [Enter] Button Accepts a menu item or displays the next screen or menu while viewing a menu or the online help. Acts as a mouse left-click when using the remote control as a wireless mouse. [ESC] Button Stops the current function. Displays the previous screen or menu while viewing a menu or the online help. Acts as a mouse right-click when using the remote control as a wireless mouse.
E-Zoom
Enter
[ ][ ][ ][ ] Buttons When using the remote control as a wireless mouse, these buttons move the pointer in the direction corresponding to the button that was pressed. When a menu screen or help screen is displayed, these buttons select menu items and setting values. [Auto] Button Automatically adjusts computer images to the optimum images.
Auto
ESC
Figure1-7
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1.3. SPECIFICATIONS
MODEL Projection System Projection Method Specification of main parts LCD Size Driving Method Pixel number EMP-720/EMP-730 RGB Liquid Crystal Shutter Projection System Front / Rear / Ceiling Mount EMP-720: 0.9inches without MLA (x3) EMP-730: 0.9inches with MLA (x3) Poly-silicon TFT Active Matrix 786432 dots (1024x768) x3
Native Res- XGA olution Aspect ratio Pixel Arrangement Projection Lens Type F-number f-number Zoom ratio Lamp Optical System Screen size (Projected Distance) Keystone correction ratio Brightness Contrast Brightness Uniformity Color reproduction Sound output Effective Scanning Frequency Range Adjustment Function (Input Signal) Analog RGB I/O Pixel Clock Horizontal Vertical Projector / Remote Control Tilt Angle Keystone Correction Display Performance Input Signal Native Resize Signal type Video Signal Sync. Signal Audio Signal Input Terminal Video Audio Type Life 4:3 Stripe
Manual: zoom / focus 1.9 to 2.1 (+/- 3%) 31 to 36 mm (+/- 3%) 1:1.16 150W UHE 1500H Dichroic Mirror Separation & Prism combine Method 30 to 300inch (1.0 to 11.7m) 9:1 EMP-720: 1500 ANSI lumens EMP-730: 2000 ANSI lumens 400:1 85% (Typ.) Full Color (1677million colors ) 1W 13.5MHz to 162MHz 15KHz to 92KHz 50Hz to 85Hz Keystone (Vertical) /Brightness /Contrast/Tint/Sound/Input signal etc. 0 to 11 degrees Vertical: -15 to +15 degrees 1024 x 768 dots 1600 x1200 / 1280 x 1024 / 800 x 600 / 640 x 480 dots Separate signal Analog (0.7V p-p,75 ohm/ Mac0.714Vp-p, 75ohm) Separate (positive&negative, bi-polarity 1-5Vpp)/ Composite (positive&negative, bi-polarity 1-5Vpp)/Sync-on-green (negative, 0.3Vpp) 500mVrms / 47Kohm Mini D-sub 15pin x1 Stereo mini jack
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Video I/O
Display Performance Input Signal Video Standard Video signal
NTSC: 550 line PAL: 550 line (Depend on observation of the multi burst pattern) NTSC / NTSC4.43 / PAL / M-PAL / N-PAL / PAL60 / SECAM Composite Video (1.0Vpp/ Sync.negative, 75 ohm) / S-Video (Luminous0.714Vpp, Chrominous 0.286Vpp, 75 ohm) / Component Video (Analog Y level 0.7V 75 ohm/ Cr Cb level +/-0.35V 75 ohm/ sync.negative 0.3V or 3-state+/-0.3V on Y) / Video-RGB (0.7V p-p,75 ohm/ Mac 0.714Vpp,75 ohm) 500mVrms / 47Kohm Composite Video: RCA x 1 S-Video: Mini DIN Component Video: Mini D-sub 15pin (in common with Analog RGB connector) Video-RGB: Mini D-sub 15pin (in common with Analog RGB connector)
Audio signal Input Terminal Video
Audio Control I/O I/O terminal Operating Temperature Power Supply Voltage Power Consumption Dimension JAPAN Except JAPAN Exclude Projection lens & Feet Maximum dimension Weight Fan Noise Accessories Power cord Computer cable Video cable Mouse cable Remote Control
Stereo mini jack (in common with Analog RGB connector) USB connector series B x1 (for mouse, K/B, control) 5°C to 35 °C <41°F to 95 °F> 100-120V / 200-240V ±10% , 50/60Hz AC 225W ( 5.5W at standby mode) 100 - 240V 3.1 - 1.5A 50/60Hz 276(W) x 70(H) x 190(D) mm 276(W) x 78.5(H) x 190(D) mm Approx. 4.3lbs / 1.9Kg 39dB 1.8m 1.8m,Mini D-sub 15pin (Male) - Mini D-sub 15pin (Male) RCA (Yellow) USB Mouse cable New (Card Type)
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1.4. INTERFACE SPECIFICATIONS
Figure1-8
1.4.1. Computer 2 / Component Video Interface
HD D-sub , 15pin CN100 7513S-15G2
11 6 1
15 10 5
Pin No. 1 2 3 4 5 6 7 8
Pin name Computer Red video signal Green video signal Blue video signal Monitor bit ID bit 2 GND GND GND GND Component Cr / Pr Y Cb / Pb None None GND GND GND
Pin No. 9 (None) 10 11 12 13 14 15
Pin name Computer (No pin) Sync GND Monitor bit ID bit 0 SDA Horizontal sync/ composite sync Vertical sync SCL Component (No pin) None None None None None None
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1.4.2. USB Mouse Interface
CN2500 UBB-4R-D14C
Pin No. Signal name VCC DD+ GND
2 3
1 4
1 2 3 4
DGND
1.4.3. Composite Video Interface
RCA pin jack
Pin No. Signal name GND CVBS
CVBS (Yellow) J300 JPJ2025-01-040
1
1 2
2
DGND
1.4.4. S-Video Interface
4-pin mini-DIN with detect pin CN300 TSC7708-012021
Pin No.
4 2 3 1
Signal name GND GND Y signal input C signal input Input detect pin GND
1 2 3 4 5 6
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1.4.5. Audio In (Computer Audio Input) Interface
Stereo mini jack (2 detect pin circuits)
6
Pin No. 1 2 3 4 5 6 7 8 9
Signal name GND Computer audio input L Computer audio input R GND GND GND GND GND GND
J2300 LGS6507-0800
SEIKO EPSON
1 9 8 7
2 3 4
5
DGND
1-11
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1.5. EXTERNAL VIEWS
10.9 0.5 0.9 3.6 5.4
0.5
1.2 2.5 3.1 R0.7 0.35 1.8 1.5 3.2 0.3
1.6 1.4
3
2.6
1
2 1.1 0.5 3.9 1.1 0.9 0.7 0.9 1 0.5 0.5 2.8 0.6 2.3 0.5 R0.2 M3×8-3 2.1 1.1 1.5 4.1 4.9 3.5 4.2 7.6
(Unit: inch)
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Chapter 2 Theory OF Operation
EMP-720,EMP-730
2.1. OVERVIEW OF HARDWARE
The hardware for the EMP-720,EMP-730 can basically be divided into two sections: the optical engine and the circuit system. This section of the manual describes the configuration block diagram or the hardware and gives an outline of the functions. The area inside the dotted lines are the optical engine (single integrated component).
Power supply unit AC input Circuit DC voltage generator Ballast output generator Ballast unit For lamp inner housing AC voltage
MA board Circuit initial setting operations and interface control Internal operation control (sensors, cooling fan, speaker, remote control, etc.) R/G/B video signal generation
Computer in S-Video Video Audio-in USB
Control panel Intake fan *1 RC receiver sensor Lamp fan
Light valves R/G/B Exhaust fan *2
Prism R/G/B integration
Projection lens unit (focus)
Lamp inner unit 150 W Lamp inner housing
Light guide unit Light source divided into 3 components (R, G and B) by lenses, filters and mirrors.
*1: The intake fan cools the R, G and B light valves (LCD panels). *2: The exhaust fan mainly exhausts heat from the lamp inner housing. *3: During repair work, the section enclosed by the dotted lines should be handled as a single unit.
Figure2-1
Overview of display operation 1). The MA board receives RGB/Component signals from the computer interface. The MA board receives video signals (S-Video or Video) from the Video/S-Video interface. (Analog signals are converted to digital signals by the MA board.) 2). The display signals (in digital format) are momentarily stored in the video memory on the MA board, and then the DR board generates signals to drive the R, G and B light valves. 3). The R, G and B light valves control the amount of light which passes through the valves. 4). The light which passes through the light valves is integrated by the prism and is then projected as an image via the projection lens unit.
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2.1.1. Circuit System Component Connection Diagram
The circuit system is shown in the following diagram. The various components are connected to the MA board which is the central component of the system.
Intake Fan 2 L/V Thermistor
4pin 4pin 3pin 3pin CN1104 CN100 PC IN
CN1101 CN1102
Intake Fan 1
V200 RC BOARD ASSMBLY
CN700
CN1
RED
CN2000 XGA
CN300
S-VIDEO
Control Panel
GREEN
J300 J2300 CN2500 CN2400 CN2401 CVBS AUDIO IN USB FPC CABLE 5pin CN2100 XGA 4pin
CN2200 XGA
BLUE
CN703
Speaker Unit
V200 MA BOARD ASSEMBLY
SCI Cable (5P) 5Pin
CN2600
CN2300
2pin
CN701 CN1103 CN1100 CN1105 CN2402 3pin 3pin 4pin 20pin
LAMP
2pin
Lamp Cover Detection Switch
LAMP Thermistor
Power Supply Unit
Ballast
Lamp Fan Exhaust Fan
Figure2-2
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MA Board
PC/VIDEO I/F
Driver ASIC ADC
3ch Video Amp. 3ch ADC PLL Sync.Sep. THC7116 (Thine) PIGMON EV9910AA (EPSON)
G PORT
PANEL DRIVER BLOCK
Level Shifter DEC Driver
PC
YUV RGB Converter
GAUGE4 EV0006AA ( EPSON )
DDC EEPROM
DEC Driver
MUTE
SEIKO EPSON
Image Processor
3Wire Serial
DDC
24LCS21A ( Microchip )
RGB YUV
2.1.2. Circuit Block
Sync
Sync Correcter Serial DAC
M62367GP ( MITSUBISHI )
"KIMURA" Circuit
AMP
NRS
DSUB15 AMP
LCCOM
VIDEO
4Wire Serial
DEC Driver
CVBS
V PORT
RCA
Chroma
VPX3226E
Main CPU Frame Memory Resizing Frame Rate Conversion Color Space Conversion OSD
Y/C
(Micronas) 20.25MHz
I2C
DIN4
AUDIO
Class-D Amp
TPA2001D1 (TI) PW164A ( Pixelworks )
IN AUDIO
Audio Controller
Speaker
INT CS/WR/RD
TEA6324T(Philips)
Stereo Mini
FAN Driver
EMP-720,EMP-730
The control circuits are shown in the following diagram. The various circuits are connected to the MA board which is the central component of the system.
Figure2-3
2-4
FLASH ROM
8Mbit MBM29DL163BD ( Fujitsu ) 1Mbit IDT71V016S15PH ( IDT )
CS/WR/RD CS/WR/RD
SRAM
External I/F Controller Chip Set IF-CPU
HID
(NEC)
MOUSE/COM
PISCES
EV0101EA V850/SA1
USB TypeB COM
USB HUB TUSB2036VF
(TI)
LAMP STATUS POWER ON/OFF
IR Remote 1
POWER SUPPLY
LAMP Ballast
IR Remote 2
SW Board
LED
Temperature Sensor
AC In
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HUMAN I/F
EMP-720,EMP-730
2.1.3. Optical Engine
The optical engine is made up of the light guide unit, light valves (R/G/B), prism unit and the projection lens. Adjustments are made by the setting of these units.
Projection lens
Prism unit
Light valve (B)
Light valve (R)
Light valve (G)
Light guide unit
Figure2-4 Optical system drive block
Optical engine
Light valve R Lamp inner unit (light source) Light valve G
Projection lens
Light valve B Light guide unit Prism (R/G/B integration)
Ballast power supply
MA board
Figure2-5 ! Caution: ·The light guide unit, light valve/prism unit and projection lens are handled together under the name "optical engine." ·Do not subject the optical system components to any shocks, and do not disassemble the light guide unit, otherwise color distortion may occur. ·Each component is adjusted at the factory for installation in its particular position. ·Furthermore, the data which is used to compensate for optical system characteristics is stored on the MA board. Accordingly, do not individually replace any of the components with components from other optical engines.
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Table 2-1.Component Functions
Component name Lamp inner unit Light guide unit Function/Other Contains UHE 150W discharge lamps which are used as the light source. The light guide unit disperses the light from the light source via lens arrays A and B in order to provide uniform illumination. In addition, a UV filter removes any harmful ultraviolet light from the LCD. After this light is polarized, it is then split into 3 spectrums (R, G and B). The intensity of the distributed components of the RGB light is controlled by means of the light valve. The prism unit integrates the red, green and blue light and sends it through the projection lens. The light that is synthesized by the prisms is focused onto the screen to project the images.
Light bulbs Prism unit Projection lens
(1). Lamp inner unit This unit includes the light source lamp (UHE-150 W) and the ballast power supply connector. The lamp is a replaceable part fastened to the underside of the projector body with 2 screws. The luminance of the lamp inner unit 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 1500 hours of usage time, the luminance will drop to about half of this.The ballast power supply connector is used to supply the AC voltage for driving the lamp to the ballast unit. The lead wires are connected to the lamp.
Ballast power supply connector
Figure2-6
As mentioned above, the luminance of the lamp inner unit becomes lower over time as the lamp is used. The lamp has an operating life of about 1500 hours, but if it appears that the luminance of the lamp has dropped significantly, it is recommended that the lamp inner unit be replaced even if the total operating time has not yet reached 1500 hours. The cumulative operating time for the lamp inner unit is stored in IC505 on the MA board. When the cumulative operating time reaches 1500 hours This represents the end of the useful operating life of the lamp. When the lamp is replaced, the lamp timer should be reset. After replacing the lamp, use the "Information Menu" to reset the lamp usage time.
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The circuit diagram is shown in Figure 2-7.
MA block LED indicator
IC703 (PISCES)
IC505
CN2401 Ballast output ON/OFF Blown lamp detection CN2402
Power supply ON/OFF Power cut detection Fan control
Lamp Inner Unit
Ballast Unit
Power Supply Unit
Figure2-7 Lamp Inner Unit Control Circuits
· The EMP-720/EMP-730 has an automatic lamp shutoff function which automatically turns the lamp off if no signal is input for a continuous period of 30 minutes.
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2.2. POWER SUPPLY UNIT
The power supply unit consists of the AC inlet, EMI filter and power supply.
Fuse
Filter circuit
AC inlet
Figure2-8
(1). Circuit block
AC inlet AC input EMI filter Thermostat EMI filter
Ballast unit X1 connector
Smoothed output Regulator circuit
DC output MA board CN2402 connector connection
Secondary-side power supply
Figure2-9
Fuse EMI filter circuit Thermostat
: Overcurrent prevention. It blows when overcurrent occurs due to a problem with power supply unit operation. : Eliminates interference from the AC power supply input. : If the temperature inside the power supply rises, this shuts down all power output to prevent damage to circuits.
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(2). Overview of operation · The output cable of the power supply unit is connected to the CN2402 connector on the MA board. It allows the following voltages and signals to be transmitted. · Power OFF detection signal (for interrupting power) · DC output · Fan control signal (for controlling the power supply heat dissipation fan) · Power supply ON/OFF signal (PWON) ! Caution: · When the AC cable is connected, the MA board is supplied with power through the CN2402 connector, even when the power is off. · The EMI filter/primary-side regulator circuit eliminates interference from the AC line and generates a DC voltage for the regulators. · The two regulator circuits generate the DC voltages shown in the table below by means of switching regulators. These regulators detect the potential of the +5 V output and provide feedback to the switching circuit, so that no fluctuations in output potential occur as a result of load fluctuations.Furthermore, the individual output voltages cannot be adjusted. Table 2-2:
Outputvoltage Signal name + 3.3V + 3.3V + 5V + 12V + 18V Output voltage Voltage accuracy ± 5% ± 5% ± 5% ± 0.6V, - a7V ± 10% Ripple (mvpp) Ripple + Spike (mvpp) Output current (A) MIN 0.02 0.2 0.02 0.2 0.2 TYP. 0.4 2.0 0.7 0.6 0.6 MAX 0.8 3.0 1.2 0.9 0.7 Protection circuit Load capacitor Overvoltage Overcurren (Reference) Interrupt 100µF Interrupt 220µF Interrupt 220µF Interrupt 220µF Interrupt 47µFX2
+ 3.3V + 3.3V + 5V + 12.2V + 18V
100mvpp 200mvpp 100mvpp 200mvpp 200mvpp 300mvpp 300mvpp 300mvpp 400mvpp 400mvpp
+ 4.6V + 4.6V + 7V -
· A cooling fan is provided in order to extract the heat that is generated inside the power supply unit. The heat that is extracted by this cooling fan is dissipated outside the projector by the air exhaust fan that is connected to connector CN1100 on the MA board.
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(3). Connector/Pin layout
1 11
10
20
Figure2-10
Pin layout for power supply connector (connected to CN2402 on MA board)
Table 2-3:
1 2 3 4 5 6 7 8 9 10 PWON +3.3V_T GND +3.3V +3.3V +5V GND +12V GND +18V 11 12 13 14 15 16 17 18 19 20 GND +3.3V_T GND +3.3V GND +5V GND +12V GND +18V
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2.3. BALLAST UNIT
The ballast unit re-regulates the ballast DC power supply (360-400 V DC/0.4 A) which comes from the power supply unit in order to generate the AC power supply (65-130 V AC) for the UHE lamps.
X2 (Connects to MA board) X1 (Connects to power supply unit)
Ballast output connector (Connect to inner lamp unit.)
Figure2-11
Block diagram
X1 (Connects to power supply unit) Sub power supply Switching circuit Regulator circuit HV Ballast output LV AC65 to 130V
DC input 360 to 400v
Control circuit X2 (Connects to CN2401 on MA board) BACTA LGND LPSTC
Figure2-12
(1). Operating principles · Sub power supply · Switching circuit : Generates the voltage (+360 V/+400 V) for the control circuit inside the ballast unit. : Performs switching for re-regulation, based on the output signal of the MA board (BACTA). (The BACTA signal turns the ballast output on or off.) In addition, this circuit generates the feedback signal for output voltage stabilization. : Generates the 65-130 V AC lamp voltage. : This monitors the regulator circuit and detects the output current. If the lamp inner housing turns off the lamp (the ballast output load current disappears), the "LPSTC" signal will be sent to the MA board. Switching duty is changed (adjustment of output voltage) based on the feedback signal from the switching circuit.
· Regulator circuit · Control circuit
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2.4. MA BOARD
This circuit board is the central control of the projector. It also establishes the interface connection for connecting host computer audio signals and external devices such as video equipment. The MA board also holds the resizing processor (main CPU), power I/O controller, digitizer (ADC, video amplifier, etc.), RAM, EEPROM, audio control circuit, color processor and other components. The diagrams below show the appearance of the MA board.
(Front)
Figure2-13
(Back)
Figure2-14
* The MA board is supplied with the optical engine as a single service unit.
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The interface connector on the MA board handles the following input ports. · Audio In (External audio input) · S-Video (S-Video input) · Video (Video equipment image input) · Computer In (Computer analog image signal, video equipment component image input) · USB (Serial control input from the remote mouse and external devices)
S-Video Video Audio In
Computer/Component Video
USB
Figure2-15
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LED[2 to 0]
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LAMP Thermistor
CN1101 CN1102 CN1100 CN1103 CN1105 CN1104
MA Board Circuit Block
L/V Thermistor
Intake Fan 1 Exhaust Fan Lamp Fan
Intake Fan 2
Remote Controller Rear Receptor (Front)
LED Control
IC1105 Serial DAC
CN1
Remote Controller Rear Receptor (Rear)
DEC Driver IC502 PW164A
R/G/BC1 [9 to 0]
L/V
IC700
Control Panel
IC900 IC506
EMP-720,EMP-730
Figure2-16
IC902 IFCPU
Frame Memory Resizing Frame Rate Conversion Color Space Conversion OSD
2-14
IC706 AD7417ARU
Ballast Unit
MUTE 12C CN2401 CN701
CN703
IC703 PISCES
IC1600 GAUGE 4
R/G/BDO [7 to 0]
IC1700
IC1701
IC2000
R XGA
IC1800 IC1801
IC1900
IC1901
IC2100
G XGA
IC2500 USB HUB IC2301 Class-D Amp
S-Video Video
Power Supply Unit
Lamp Cover Detection Switch
CN2402
B XGA IC403 Chroma IC200 PIGMON IC704 G-Senser
USB
CN2500
IC2300 Audio Controller
Speaker Audio-In
CN100 CN2300
CN100
CN100
IC107 ADC
PC IN
CN100
Revision:A
EMP-720,EMP-730
(1). Operating principles · The IC902 and the surrounding circuits are provided with a 3.3V standby power and the power supply control is provided with a 5V standby power. (If the AC cord is connected to the power supply, +3.3 V and +5 V standby power is supplied even when the main power is turned off. · When the power is turned on, the reset signal which is being controlled by the IFCPU (IC902 on MA board) is canceled, and the CPU loads the program stored in the mask ROM and writes it to the SRAM. After this, settings are carried out in accordance with the program until the initial screen (NO SIGNAL display) appears. · Two thermistors (L/V thermistor, Lamp thermistor) detect projector temperature. When a temperature limit is exceeded, the thermistor signal is sent through the MA board and interrupts IC902, causing IC502 (main CPU) to change operation of the fan or triggering IC703 (PISCES) to stop the power supply. · In order to display images, the received data is first stored in the SRAM. The SRAM data is then re-read by the resizing processor (main CPU). · The video input signal (S-Video/Video In) is converted to digital by the color processor and stored in SRAM. · The color processor, in the S-Video and Video interface signal line, converts the signal to digital and outputs it. · After audio output (Audio) enters the audio controller (IC2300), the amplified signal goes through the power amplifier (IC2301) and is output from the built-in speaker. · The sound volume control adjusts volume in 21 steps, from mute to maximum. · The G-Sensor (IC704) detects up or vertical inclination of the projector body and generates analog DC voltage according to the angle of inclination. IC706 converts the analog DC voltage to digital and stores it in the main CPU (IC502), where the inclination angle is electronically detected. The main CPU (IC502) automatically corrects the screen keystone distortion in accordance with the amount of vertical inclination angle detected.
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2.5. CONTROL PANEL
The control panel has 4 buttons, and is connected to connector CN703 on the MA board.
Power
Help
· [Power] Button
Turns the projector power on and off.
Source Keystone
· [Help] Button
Displays the online help menu to assist you if you have a problem.
· [Enter] Button
Switches the input source between the Computer/ Component Video port, S-Video port and Video port each time the button is pressed. When pressed while a help menu is being displayed, it accepts the menu item that is currently selected.
Enter Select
· [Keystone] Button
Press to manually correct keystone distortion in images. When pressed while a help screen is being displayed, it selects items in the menu.
Figure2-17
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2.6. RC RECEIVER SENSORS
These are elements which are used to detect (receive) the infrared signals that are transmitted from the remote control. The RC receiver sensors are located at the left of the front and at the rear of the projector.
RC receiver sensor (front)
RC receiver sensor (rear)
Figure2-18 RC Receiver Sensors
The output signals (serial data) that are received by the receiver sensors are connected to the IC703 (PISCES) on the MA board. 1). The MA board uses the serial data received from the remote control (from the button switches in the remote control) to control the power ON/OFF status, the operation of menus, and to control the image display. 2). The serial signals which are sent to the AV board via the MA board are used to control muting, volume adjustment. The control block is shown in Figure 2-19.
(Rear) MA board IC700 Infrared signals Remote control CN700 CN1 IC2000 V200RC board (Front) IC703 PISCES
Figure2-19 Remote Control Circuit Block Diagram
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2.7. SPEAKER
The projector has a single 1 W built-in speaker which is at the back of the projector and faces out to the rear. It can be used for monaural output of the sound which is input to the projector from a host computer or video source.
Speaker
Figure2-20 Speaker
MA board IC2300 Audio controller TEA6324T (Philips) IC2301
Power amplifier
Audio IN Mono
J2300
TPA2001D1 (TI) Mute 12C
S P
Control signals
Figure2-21 Speaker Control Circuit Block Diagram
The sound which is input from the computer or video source is amplified by the control circuits (audio controller and power amplifier) on the AV board, after which it is output from the built-in speaker that is connected to CN2300.
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2.8. TEMPERATURE CONTROL
2.8.1. Sensors and Switches
This projector is equipped with the devices shown in the table below in order to protect thesafety of the operator and maintain general safety with regard to the projector itself (by preventing abnormalities in operation). Table 2-4:
Name Lamp cover detection switch Installation position/Type Power supply unit Function/Application Interrupts AC power supply when the lamp cover is open (power cannot be turned on). Prevents temperature buildup around the lamp inner housing. If the temperature rises above a certain level, the lamp is turned off. Prevents temperature buildup around the light valves. If the temperature rises above a certain level, the lamp is turned off.
LAMP thermistor
Exhaust fan (thermistor)
L/V thermistor
Above prism (thermistor)
(1). Lamp cover detection switch This switch is installed on the Power supply unit, and works in conjunction with the lamp cover latch. If it were possible to turn on the power while the lamp cover was still open, the lamp would turn on and generate high temperatures. This cover is normally opened when the operator is replacing the lamp inner unit, and so the switch is provided in order to prevent the danger of injury from burns which could occur if the lamp turned on accidentally.
Lamp cover detection switch
Figure2-22
The lamp cover detection switch is inserted in the AC input line for the power supply unit. Accordingly, when the lamp cover is opened, the AC supply to the power supply unit is interrupted, so that the power cannot turn on. (2). Thermistor and temperature sensor operation IC703(PISCES) on the MA board samples the temperatures (resistances) at the two thermistors at intervals of 1sec. The two thermistors are located inside the projector, and mainly detect the temperature of the optical block. The CPU controls the fan and shuts down power according to the measurement results.
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The user is alerted to the projector condition by warning indicators based on temperature detection results as shown in the following table.
Table 2-5 Warning Sensors
Condition Normal temperature Warning temperature Abnormal temperature Off Flashes orange Lights red Warning indicators Meaning Normal operation in progress If temperature rises any higher, projection stops. Overheating (no projection)
Problem with fans, thermistors or temperature detection Flashes red (Flashing at 1-second inter- circuit vals Flashes red (Flashing at 0.5-second intervals Lamp problem
*Refer to 2.9 for a detailed description of fan operation. *Refer to 2.10 for a detailed description of the warning indicator. (1). LAMP thermistor The LAMP thermistor, which is fastened with nylon rivets, detects the temperature of the lamp. To prevent damage to surrounding parts by overheating of the lamp inner, the power save controller on the MA board activates the temperature warning indicator lamps and stops power supply output (lamp power supply) when the temperature rises above a set value. (2). L/V thermistor This thermistor is secured to the shutter frame at the top of the prism. If the air filter frame at the bottom of the projector (a consumable part which can be replaced by the user) becomes blocked and sufficient cooling is not possible, the CPU on the MA board uses the temperature indicator to give a warning and interrupts the supply of power to the ballast unit (lamp power supply) in order to protect the lamp panels (LCD panels) which can easily become damaged by high temperatures.
LAMP thermistor L/V thermistor
Figure2-23 L/V Thermistor and LAMP Thermistor
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2.9. FAN OPERATION
There are five fans inside the projector. These fans discharge heated air from the projector in order to prevent problems with circuit operation and component damage resulting from overheating. (It is mainly the lamp inner housing, power supply unit and ballast unit which generate heat.The power supply fan is in the power supply and is always operating.)
Lamp fan
Figure2-24 Rear of Optical Engine
Exhaust fan
Figure2-25 Exhaust Fan
Intake fans R
Intake fans G
Figure2-26 Intake Fans
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(1). Fan control circuit block
PW (Main CPU)
PW164A PORTA4 PORTA2 PORTA3 DACLD DACDI DACCLK
DAC
M62367 LD DI SK
A01
LVRFAN
FV0 FDET0
A02 A08
LVGFAN
FDET2
V850 (IFCPU)
FANDET0 FANDET1 FANDET2 FANON FANDET3
EXFAN
FV1 FDET1
PBSFAN
FDET3
Figure2-27
(2). Operation control · The MA board is connected to two thermistors (the L/V thermistor and the LAMP thermistor). The driver CPU controls the operation of the four fans (intake fans and exhaust fan) based on the temperatures detected by the thermistors. · The signals that are output by IC1105 (driver CPU) on the MA board are used to change the output from the fan drive circuit (regulator) on the MA board in order to control the intake fans and exhaust fan. · The feedback signals from the fans are used by the CPU to monitor the operation of the fans (stopped or running) for any abnormalities. If the feedback signal indicates a condition which the CPU does not expect, the CPU judges that there is an abnormality in the operation of the fan and immediately turns off the lamp and causes the warning indicator to light red. · The fan at the power supply unit operates at high speed or low speed based on the signal which is generated by IC902 (IFCPU) on the MA board. (3). Fan operation (During standby) Intake fan (LVGFAN), lamp fan Intake fan (LVRFAN) Ventilation fan : Continues operating at set speed when power is turned on. : Adjusts speed according to set temperatures from the thermistor. : Fan power turns on and it runs at low speed when thermistor temperature reaches the low speed set value. The fan turns off when the thermistor temperature falls below the low speed set value.
(When lamp is on) The intake fans and exhaust fan start operating 0.5 of a second before the lamp turns on. After this, the fans operate at high speed or low speed based on the temperatures detected by the thermistors. (When cool-down is in progress) The fans operate for a 50 second cool-down time after the lamp is turned off.
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2.10. LED INDICATORS
The MA board has two LED indicators which show the operating status of the projector. The statuses of the indicators can be checked from slits provided in the upper case unit.
Warning indicator Power indicator Warning indicator Power indicator
Figure2-28
The following tables show what the indicators mean and how to remedy problems that they indicate. (1). Power indicator
: lit Indicator status Orange Projector status Standby condition Problem and remedy (No abnormality) The power cord should only be disconnected at this time. Projection starts when the [Power] button on the projector's control panel or the remote control is pressed. (No abnormality) · Wait for a short while. The cool-down period lasts for 30 to 45 seconds. · The [Power] buttons on the projector's control panel and the remote control will not operate during the cool-down period. When cooldown is complete, you can then use the [Power] buttons. Green Green Projecting in progress Warm-up in progress (No abnormality) (No abnormality) Wait for a short while. The warm-up period lasts for about 40 seconds. When warm-up is complete, the indicator will stop flashing and light with a green color. : flashing
Orange
Cool-down in progress
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(2). Warning indicator
: lit Indicator status Red Projector status High temperature inside projector (overheating) Problem and remedy The lamp will turn off automatically and projection will stop. Wait for about 5 minutes without operating the projector. After 5 minutes have elapsed, unplug the power cord and plug it back in again. If the projector overheats, check the following two points. · Check that the air inlet and air outlet are clear, and that the projector is not positioned against a wall. · If the air filter is dirty, it should be cleaned. When the power cord is plugged back in, the projector will return to its previous state, so press the [Power] button on the projector's control panel or the remote control to turn it back on. If the projector continues to overheat even after the above points have been checked, or if the indicators show a problem when the power is turned back on, there may be a problem with the optical engine, lamp inner housing, L/V thermistor, lamp thermistor, power supply unit or ballast unit. Unplug the power cord from the electrical outlet, remove the lamp and check if it is broken. If the lamp is not broken, reinstall it. Then plug the power cord back in and press the [Power] button on the projector's control panel or the remote control to turn the projector back on. If the lamp is broken, remove it while being very careful not to injure yourself on the broken edges, and replace it with a new lamp. (Projection cannot be carried out until the lamp is replaced.) Check that the lamp and the lamp cover are securely installed. If the lamp or lamp cover is not securely installed, the lamp will not switch on. Red (flashing at 1-second intervals) Orange High-speed cooling in progress (This is not an abnormality, but if the temperature rises too high again, projection will stop automatically.) Set the projector up in a place which is well-ventilated, and so that the air filter and exhaust vents are clear. Clean the air filter. Internal problem There may be a problem with the MA board, optical engine, power supply unit, fans or thermistors. : flashing
Red (flashing at 0.5-second intervals)
Lamp problem
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Chapter 3 Troubleshooting
EMP-720,EMP-730
3.1. BEFORE CARRYING OUT TROUBLESHOOTING
1. If repairs involving the replacement of blocks or components have been carried out, always be sure to re-check whether the replacement parts themselves are operating correctly or not (in order to determine whether the problem is the result of something such as a loose connector). 2. All instructions and procedures listed in troubleshooting flowcharts should be carried out as given. 3. Follow the procedures given in Chapter 4 - Disassembly and Assembly when replacing any of the projector components. 4. When checking the operation of the projector, always check whether the connectors are connected securely before proceeding to other checks. 5. In order to confirm proper operation, use normal AC power and the correct cable type.
3.1.1. Troubleshooting Tools and Equipment
The following tools and equipment will be required in order to carry out troubleshooting, and so you should check that they are on hand.
Table 3-1
Name Projection screen Tape measure (3 m) Host computer USB mouse Video equipment Multimeter Double-sided tape General tools 1 1 1 1 1 1 Short length 1 set Qty. Projecting images Measuring projection distances Transmitting audio and image data Checking mouse operations Transmitting audio and image data Measuring resistance values and voltages (AC/DC) Attaching parts Tools and equipment listed in Chapter 4 Section 4.1. Application/Other
3.1.2. Field Replacement Parts
· If replacing projector parts in the course of troubleshooting, replace the whole service unit which contains the part that needs to be replaced. · The optical engine (comprising the light guide unit, light valves, projection lens unit and prism unit) and the MA board form a single service part. Accordingly, the individual components should not be disassembled or be replaced with other components (because the components have all been adjusted with respect to each other). · Carry out the safety tests after parts replacement is completed.
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3.2. ENTRY
Check the nature of the problem using the following flow diagram, and then proceed to the corresponding flow chart (on the following pages).
START
Exterior check
· Exterior checking Check for any external abnormalities (such as damaged cover)
Internal cable connections
· Internal cable check Remove the upper case and check the cable connectors on the MA board. (Reconnect if required.) · Power ON/OFF/Initialization Connect the power cord and turn on the power. Check the initial operations until the "NO SIGNAL" message appears, and then check the power off operation. 1. After power is turned on, the Power indicator flashes green and projection starts. 2. After about 30 seconds the operation indicator lights green and projection starts at maximum brightness.
Power ON/OFF
Screen display/ Image quality
· Display input/output and image quality (use the [Enter] (Source) button to change input) Check the quality of input and output signals from computer, S-Video and Video sources. Carry out the following four steps first. 1. Check the projection position adjustment with the front feet and the projection distance. 2. Adjust the image using the zoom ring and focus ring. 3. Press the [Auto] button to optimize the display.
Audio output
· Audio input/output Check that the Audio-In is connected to a computer or video source Check the A/V mute button.
Control panel
· Control panel button operations Check the functioning of each button on the control panel.
Remote control operation
· Remote control operation Check the functioning of each button on the remote control.
· USB mouse operation using USB interface USB mouse
Other
· Other Abnormal noise, image problem, ordor, smoke
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3.2.1. Exterior Checking
START
Upper Case Unit
· There should be no damage, deformation or cracking due to external forces. · The lower case unit should be installed correctly.
Front case
· The front remote signal receiver should be clean and should not have any foreign materials (such as tape) attached. · Air vents should be clean. · Upper case should be installed correctly. · No buttons should be stuck down.
Control Panel
Projection Lens Unit
· Focus ring and zoom ring should turn smoothly. · Lens should be clean and free from damage.
Lower Case
· There should be no damage, deformation or cracking due to external forces. · Air vents should be clean.
Air Filter
· Air filter frame should be installed correctly. · Filter should be clean (remove the air filter frame from the lower case to check). · Is there dirt on the intake fan behind the air filter?
Lamp Cover
· Lamp cover should be securely attached to lower case unit. · Lamp cover safety switch latch should be free from damage (remove the lamp cover to check). · Plastic frame should be free from any deformation or heat damage (discoloration) (remove the lamp inner unit to check). · Power supply connector should be free from discoloration. · Glass surface of lamp should be clean. · Can the projection height be adjusted with the front foot?
Lamp Inner unit
Front Adjustable Foot Unit
Interface Connectors
· Connectors and terminals should not be bent or discolored. · Connectors and terminals should be free from foreign particles.
AC Inlet
· Connectors should not be discolored. · Socket should be free from damage.
Air Filter/Lamp Inner Unit/ Lamp Cover Installation
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3.2.2. Internal Cable Check
Turn off the power, disconnect the power cable and then start checking.
START
Upper Case Unit Removal
Control Panel
· MA board CN703 (lock-type connector) · MA board CN2300
Speaker
RC Receiver Sensor
· RC board CN1 MA board CN700
Exhaust Fan
· MA board CN1100
LAMP Thermistor
· MA board CN1105
Intake Fans
· MA board CN1101, CN1102
R/G/B Light Valves
· MA board CN2000/2100/2200 (lock-type connector)
L/V Thermistor
· MA board CN1104
Ballast Unit
· Ballast unit Optical engine · MA board CN2401
Power Supply Unit Lamp Cover Detection Switch
· MA board CN2402 · MA board CN701
Lamp Fan
· MA board CN1103
Upper Case Unit Installation
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3.2.3. Power Supply ON/OFF
START
Power cord connection
Is the power indicator orange?
Yes
No
Replace the power supply.
Replace the power supply fan.
No
Is the power supply fan turning?
Yes
No
Is the fan getting power?
Yes
Replace the power supply.
Press the [Power] button. No Does the Power indicator flash green? Yes
Replace the MA board/ optical engine.
Back to Start
Is the operation indicator No Power indicator lit green? Lit green Yes Flashing green (0.5second intervals) Flashing orange (0.5second intervals) Off
Warning indicator
Projector status
Remedy Let the projector cool down. If the problem recurs after the projector has cooled down, replace the optical engine and MA board.
Flashing High orange temperature (0.5-second warning intervals)
Flashing red Lamp problem (0.5-second intervals)
Check the lamp cover. If the lamp is broken, replace it. If the lamp is not broken, so reinstall the lamp and check if it turns on. If the lamp does not turn on, replace it.
Off
Flashing red Fan problem Replace any fans that are not working. (1-second Sensor problem Check that all sensor connectors are intervals) Internal problem connected. Lit red High temperature problem Let the projector cool down. If the problem recurs after the projector has cooled down, replace the optical engine and MA board.
Off
Is the lamp turned on?
Yes
No
Replace the MA board/ optical engine.
Press the [Power] button (to turn off the power).
Does the operation indicator flash orange?
Yes
No
Replace the MA board/ optical engine.
Does the power indicator turn orange within 2 minutes of flashing orange? Yes
A
No
Replace the MA board/ optical engine.
To next page
SEIKO EPSON
3-6
Revision:A
EMP-720,EMP-730
Remedy for power supply problems (1). Determine whether the problem is being caused by components inside the power supply unit, or whether it is being caused by some external factor. (2). The basis for judging this is by checking factors such as output voltage, internal temperature, appearance of components, odors and smoke. (3). If the cause is judged to be an internal problem, replace the power supply unit. (4). If the newly-replaced power supply unit also has a problem and the symptoms are the same as before, then the cause of the problem is probably some external factor. (5). If the problem is caused by an external factor, eliminate the external factor that is causing the problem. (6). If the power supply unit is recoverable but is not working properly (such as if high temperatures are causing the thermostat to isolate the power supply, or the overcurrent protection circuit has operated), then there is no need to replace the power supply unit. (7). If the power supply unit is not recoverable and is not working properly (such as if overcurrent has blown a fuse), replace the power supply unit. (8). If there is a problem with the power supply fan, the power supply will be shut down after several minutes operation (the indicators will switch off). In such cases, replace the power supply fan.
3.2.4. Display input/output and image quality
A
Power on
Is the image projected? Yes "Image signal not received" message appears at the bottom left? No Replace the MA board, optical engine.
No Start
1).Adjust the height using the front adjustable foot. 2).Press the [Keystone] buttons to correct distortion. 3).Adjust the focus. Yes
Yes Does the image appear clearer? No Clean the projection lens.
Does the image appear clearer? No Clean the area around the light valves.
Yes
Does the image appear clearer? No Replace the MA board and optical engine.
Yes
B To next page
! Caution: · The image quality can also be affected by condensation and by a dirty lens. If condensation forms, the problem will correct itself naturally if the projector is left to stand for a while.
SEIKO EPSON
3-7
Revision:A
EMP-720,EMP-730
B
C
Connect the host computer to the Computer/ Component Video port and display an image.
Connect a source to the following interfaces. 1. Video 2. S-Video Does an image appear? No
Yes
Is the image projected? No Press the [Source] button and select the input source
Yes Connect a source to the interface to be checked.
C Is the image projected? No Replace the MA board, optical engine. Yes
D To next page
SEIKO EPSON
3-8
Revision:A
EMP-720,EMP-730
3.2.5. Audio output
D
Connect the host computer's audio output to the Audio In connector. Press the [Source] button to select "Computer" and then output sound from the built-in speaker. Can the volume and tone Yes be adjusted? No Replace the MA board and optical engine.
Is sound output from the built-in speaker? No Re-connect CN2300 on the MA board.
Yes
Is sound output from the built-in speaker? No Repla