Optoma EP739 Service Manual
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Optoma EP739 Service Manual

Projection system
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SERVICE MANUAL

Model Name : EP739/EP739H/EP738
D a t e
R e v i s e V e r s i o n
2 0 0 4 / 1 0 / 5
V 1 . 0
2 0 0 5 / 7 / 1 1
V 2 . 0
Copyright October, 2004 . All Rights Reserved
Series
Prepared by SI :
________________________________________
Prepared by TSE :
________________________________________
Checked by :
________________________________________
Approved by :
________________________________________
I n i t i a l I s s u e
A d d E P 7 3 9 H P r o d u c t¡F C h a n g e i n
Document #80J-G04-02A . P/N: 36.80J02.002
D e s c r i p t i o n
I
I I : N o t i c e
1 - 2
7 - 1 : N o t i c e
7 - 2 2 : N o t i c e

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Summary of Contents for Optoma EP739

  • Page 1: Service Manual

    SERVICE MANUAL Model Name : EP739/EP739H/EP738 Series Prepared by SI : ________________________________________ Prepared by TSE : ________________________________________ Checked by : ________________________________________ Approved by : ________________________________________ D a t e R e v i s e V e r s i o n...
  • Page 2 Preface This manual is applied to EP739/EP739H 0.7” DMD XGA and EP738 series 0.5” DMD SVGA digital projection system. The manual gives you a brief description of basic technical information to help in service and maintaining the product. Your customers will appreciate the quick response time when you immediately identify problems that occur with our products.

  • Page 3: Table Of Contents

    Notice:1. There are three difference parts between EP739 and EP739H. As table I. 2. In order to differentiate appearances difference between EP739 and EP739H, we get a picture to description EP739H. If we see the mark in the spec label as table II, that means such kind of product are EP739H.
  • Page 4 Equipment Needed Hardware Setup Procedure Firmware Progarm Installation Procedure Firmware Upgrade Procedure Chapter 6 DDC Key-in Procedure Equipment Needed Setup Procedure DDC Key-in Procedure Appendix A Exploded Diagram Appendix B 7-16 Serial Number System Definition 7-22 Reader’ s Response 7-23 EP739/EP739H/EP738...

  • Page 5: Chapter 1 Introduction

    One panel 0.5" DMD SVGA projection system with 1600 ANSI lumens for EP738 series Pheonix 200WDC SHP Lamp (user replaceable) dimmable to 160W for both EP739/EP738P Ushio 200WDC SHP Lamp (user replaceable) dimmable to 160W: for EP738 High efficiency cooling system with low system acoustic noise level Light weight Approx.

  • Page 6: Optical Specifications

    - 2000:1 Max. (Full on / full off) Contras t r a t i o - 1500:1 Typical (Full on / full off): for both EP739/EP738P - 1300:1 Typical (Full on / full off): for EP738 - 1000:1 Minimum (Full on / full off) - 85% Max.
  • Page 7 - Pheonix 200WDC SHP Lamp (user replaceable) dimmable Lamp type to 160W: for both EP739/EP738P - Ushio 200SHP NHS Lamp (user replaceable) dimmable to 160W: for EP738 - 2000 hours Lamp life - 1500 hours typical, 50% survival rate - F# 2.4 – 2.65 @2.4m, f = 28.04 ~ 35.59 mm @2.4m.

  • Page 8: Electrical Specifications

    - Universal AC 100—240V 50 / 60 Hz with PFC input Power Supply - 200W for Phoenix SHP Lamp @ normal operation :for both EP739/EP738P 200W for Ushio SHP Lamp @ normal operation:for EP738 - Variance FAN speed control ( Depend on temperature variance) Power Consumption - 265 Watt +/- 10% at normal operation - Standby mode <...

  • Page 9: Mechanical Specifications

    - Temperature control circuits with adaptive voltage control fan speed - Maximum touch temperature follows UL60950 - 7 degree with elevator mechanism Ti l t Angle -± 16° degree Keystone correction Lamp Door Protection -Lamp power supply shut off automatically when door open. EP739/EP739H/EP738 Series...

  • Page 10: Environment

    - 1500 hours typical, 50% survival rate - Operating 0~2,500 ft, for 5°C~35°C Altitude 2,500~5,000 ft, for 5°C~30°C 5,000~10,000 ft, for 5°C~25°C - Storage 40,000 ft - Operating more than 12,000 hours ( 90% Confidence Level ) M T B F EP739/EP739H/EP738 Series...

  • Page 11: Compatible Modes

    1-6 Compatible Modes Analog ( EP739 only) ( EP739 only) ( EP739 only) ( EP739 only) EP739/EP739H/EP738 Series...
  • Page 12 D i g i t a l (For EP739 Only) EP739/EP739H/EP738 Series...

  • Page 13: Remove Lamp Module And

    Step1: Turn unit to bottom side. Unscrew two screws to remove Lamp Cover , and then unscrew two screws to pull out Lamp Module. Step2: Unscrew six hex screws and four screws to remove Back Cover : for EP739 only. Back Cover Step3: Unscrew four hex screws and four screws to remove Back Cover for EP738 series only.

  • Page 14: Remove Top Cover, Keypad Board, Main Board And

    Remove Top Cover, Keypad Board, Main Board and Front Cover Step1: Unscrew five screws and turn over the unit and press the Top Cover. Step2: Unplug one FPC cable to remove Top Cover. EP739/EP739H/EP738 Series...
  • Page 15 Step3: Unplug one FPC cable from Top Cover. Step4: Unscrew four screws to remove Keypad Board and Keypad Button. Step5: Unscrew three hex spacer from Top Cover. EP739/EP739H/EP738 Series...
  • Page 16 Step6: Unplug one FPC cables and nine wires, and then unscrews 5 screws to remove Main Board. Absorption Noise CVS Mylar Mylar Mylar Mylar Mylar Main Board Step7: Pull out Front Cover. Front Cover EP739/EP739H/EP738 Series...

  • Page 17: Remove Lamp Driver, 70*20 Axial Fan Module And Lvps

    Step1: Unplug one wire, unscrew two screws and two hex screws of Lamp Driver, unscrew two screws to remove Lamp Cable and then separate the wedge from the Fan Module, and then remove the Lamp Driver. Step2: Unscrew two screws to remove Fan Module. EP739/EP739H/EP738 Series...
  • Page 18 Step3: Under the Lamp Driver, unscrews seven screws to remove LVPS Plate. (One is grounding screw). Grounding Screw Step4: Unplug two wires to remove LVPS. LVPS Holder LVPS EP739/EP739H/EP738 Series...

  • Page 19: Remove 50*20 Blower Fan, Color Wheel And Thermal Switch

    Step1: Unscrew eight screws to remove Engine Module, 50*20 Blower Fan and Color Wheel. Step2: Remove 50*20 Blower Fan. Srep3: Unscrew two screws to remove Light Cut and Fan Guide Metal For Lamp. Step4: Unscrew one screw to remove Thermal Switch. EP739/EP739H/EP738 Series...

  • Page 20: Remove Dmd Board, Mdm Chip And Optical Engine Module

    Front Cover Front Cover Front Cover Front Cover Front Cover Remove DMD Board, DMD Chip and Optical Engine Module Step1: Unscrew four screws to remove Heatsink Baker and Heatsink Spring. Step2: Unscrew four screws to remove DMD Module. EP739/EP739H/EP738 Series...

  • Page 21: Remove Interrupt Switch Module, Thermalsensor Board

    Board, Speaker, Elevator Module and Bottom Cover Step1: Unscrew two screws to remove Interrupt Switch Module. Srep2: Unscrew two screws to remove Elevator Module. Step3: Unscrew one screw to remove Thermal Sensor Board. Step4: Take off Speaker and Speaker Holder. EP739/EP739H/EP738 Series...

  • Page 22: Chapter 3 Troubleshooting

    Chapter 3 Troubleshooting Equipment Needed Projector VESA VGA Cable/VESA DVI Cable PC (Personal Computer) with analog and digital signal output. DVD Player for Video Signal and Audio Signal. Remote Controller EP739/EP739H/EP738 Series...

  • Page 23: Main Procedure

    Check the Lamp cover assembly OK or not. Check thay have the sound of Lamp ignitor output from Unit or not. Check the Cable of limit switch. Check the DMD board. Check the Lamp module. Check the Ballast. EP739/EP739H/EP738 Series...
  • Page 24 Check the Photo sensor. Check the Main board. Check the DMD board. Dot Defect isn’t Compliant with the Spec. Ensure the Projection lens is clean. Use the Air gun for the Optical engine clean. Check the DMD chip. EP739/EP739H/EP738 Series...
  • Page 25 (Check the main board if OSD menu cannot show on the screen) Have Garbage Pattern? Ensure the signal cable and source work as well. Check that can OSD menu show on the screen. (Check the main board if OSD cannot show on the screen) EP739/EP739H/EP738 Series...
  • Page 26 (Check the cable length of cable; the signal will be reduce when the signal cable is longer than 5m) Do the “Factory Reset” of the engineering mode. (Check the Main board if the image still display with noise.) EP739/EP739H/EP738 Series...

  • Page 27: Audio Troubleshooting

    It might has the noise issue if the volume select to the max.) Use the new Speaker for the test. (Replace the Speaker if the new Speaker works fine with the Unit.) Check the Speaker wire that has broken issue or not. Check the Main board. EP739/EP739H/EP738 Series...
  • Page 28 Use a known Remote control for the function test. (Replace the Remote control if the new Remote control works fine with the Unit.) Check the Main board if the Unit works fine with a known good Remote control. EP739/EP739H/EP738 Series...

  • Page 29: Function Test And Alignment Procedure

    Chapter 4 Function Tes t and Alignment Procedure Product EP739/EP738 series Test Equipment IBM PC with XGA resolution (Color Video Signal & Pattern Generator) DVD player with component video (Y, Pb, Pr) and Multi-system (NTSC / PAL / SECAM) HDTV Tuner or Source (480i/p, 576i/p, 720p, 1080i)

  • Page 30: Test Display Modes And Pattern

    Test Display Modes & Pattern 4-4.1 Compatible Modes A nalog (for EP739 only) (for EP739 only) (for EP739 only) (for EP739 only) EP739/EP739H/EP738 Series...
  • Page 31 D i g i t a l : for EP739 only 4-4.2 Function Tes t Display Pattern PC Signa l & i t i EP739/EP739H/EP738 Series...
  • Page 32 Figure 1. Fine Line Moire Figure 2. 16 Gray Scale Figure 3. 64 RGBW Scale Figure 4. Red Pattern Figure 5. Green Pattern Figure 6. Blue Pattern EP739/EP739H/EP738 Series...
  • Page 33 Figure 7. Full White Figure 8. Full Black Figure 9. Gary 30 Pattern Figure 10. Blue 60 Pattern Figure 11. Text Pattern Figure 12. Boundary Frame EP739/EP739H/EP738 Series...
  • Page 34 Video & Audio Signa l . y l EP739/EP739H/EP738 Series...

  • Page 35: Inspection Procedure

    Test Pattern:Full black and Gray 30 patterns Please check and ensure the unit is under the spec. (The bright blemish should not be able to see under Gray 30 pattern) If not, please return the unit to repair area. EP739/EP739H/EP738 Series...
  • Page 36 If not, please return the unit to repair area. HDTV Test Signal:HDTV signal Test Pattern:480i/p,576i/p,720p,1080i Please check and ensure the unit can display the HDTV signal without color abnormal or image abnormal issue. If not, please return the unit to repair area. EP739/EP739H/EP738 Series...
  • Page 37 After final QC step, we have to erase all saved change again and restore the factory defaults. Please select and enter “Factory Reset” function of “Service Mode” to ensure the function is work as well. This action will allow you erase all end-user’s settings and restore the original factory setting. EP739/EP739H/EP738 Series...

  • Page 38: Firmware Upgrade Procedure

    Equipment Needed Software : - DLP Composer - Firmware Hardware : - Power Cord - USB Cable (P/N:42.86006.001) - PC or Laptop - Projector Hardware Setup Procedure Connect USB Cable of PC to USB port of Projector. USB Cable EP739/EP739H/EP738 Series...

  • Page 39: Firmware Progarm Installation Procedure

    Firmware Progarm Installation Procedure 5-3.1 DLP Composer Installation Procedure Execute the “DLP Composer Lite V3.X Setup” program. Click “Next” icon. EP739/EP739H/EP738 Series...
  • Page 40 Move the bar to the bottom (as the red arrow shows) and then select “I accept and agree to be bound by all the terms and conditions of this License Agree- ment” , then click “Next” icon. Select “All” and click “Next” icon to continue. EP739/EP739H/EP738 Series...
  • Page 41 Click “Finish” to complete the installation. Click “Yes” to restart the computer. EP739/EP739H/EP738 Series...
  • Page 42 5-3.2 USB Driver Upgrade Procedure After linking the PC and EP739/EP738 series projector with a USB cable, press and hold the menu button, then push the power button to turn on the projector. Note : The “Temp” LED and “Lamp” LED should be full on.
  • Page 43 Click “OK”. The USB driver updated successfully. Right click “My Computer” on the desktop. Select “Properties” on the popup menu to launch the “System Properties” window. Choose “Hardware” and then click “Device Manager.” Device Manager My Computer System Properties Hardware EP739/EP739H/EP738 Series...
  • Page 44 Click “Jungo” to assure “DDP2000” and “WinDriver” are properly installed. If not, repeat Step 1 ~ 6. Device Manager EP739/EP739H/EP738 Series...

  • Page 45: Firmware Upgrade Procedure

    Firmware Upgrade Procedure Execute the “DLP Composer ” file. Click “Edit” and “Preferences”. EP739/EP739H/EP738 Series...
  • Page 46 Click “Library”. The library path located to the default installation directory is : C:\Program Files\DLP Composer. If not then press “Browse” to select the right path. Select “Edit\Preferences\Communications”, choose “USB”, and then click “OK”. EP739/EP739H/EP738 Series...
  • Page 47 Choose “Flash Loader” and click “Browse” to search the “EP739_XGA_Flash_Jul.12.2004_C03_NoFashBoot.” file: for EP739 only “EP738_SVGA_Flash_Jul.27.2004_A02” file: for EP738 series only Then click this button to maximize the window size. Click “Reset Bus” to erase the flash memory. EP739/EP739H/EP738 5-10 Series...
  • Page 48 Click “Yes” to erase the flash memory. 9. After file was download. Please to restart the unit and enter the service mode to check the F/W version. Note Note :Press the “Power” and “Left” and “Left” and “Menu” button to enter Service Mode. EP739/EP739H/EP738 5-11 Series...

  • Page 49: Ddc Key-In Procedure

    Chapter 6 DDC Key-in Procedure Equipment Needed PC or Laptop (OS:Windows98 or Windows Me) EDID Fixture DFP to DVI Cable Power Adapter RS-232 Cable VGA Cable Power Cord DDC Driver EP739 Unit EP739/EP739H/EP738 Series...

  • Page 50: Setup Procedure

    Make sure the JP1and JP5 are close and JP2 is open. Step3. Connect P2 of the fixture with VGA Port of unit by the VGA Cable. Step4. Connect P3 of the fixture with DFP Port of EP739 by the DFP to DVI cable: for EP739 only Step5.

  • Page 51: Ddc Key-In Procedure

    DDC Key-in Procedure 6-3.1 Analog for both EP739/EP738 series Step1. Execute “EP739 EDID” program. *Note: The DDC Program file use on win98/Me only. Step2. Mark sure the COM port is connecting ok. Choose the “Analog” to do the Analog DDC procedure.
  • Page 52 Step3. Key-in S/N in to the blank beside Barcode, and than press “Enter” key on the keyboard to begin programming. Step4. After finishing the above action, “PASS” message will appear on the screen. EP739/EP739H/EP738 Series...
  • Page 53 6-3.2 Digital: for EP739 only Step1. Mark sure the COM port is connecting ok. Choose the “Digital” to do the Digital DDC procedure. EP739/EP739H/EP738 Series...
  • Page 54 Step2. Key-in S/N in to the blank beside Barcode, and than press “Enter” key on the keyboard to begin programming. Step3. After finishing the above action, “PASS” message will appear on the screen. EP739/EP739H/EP738 Series...

  • Page 55: Appendix A

    Appendix A Exploded Diagram EP739/EP739H/EP738P Notice: 1. Beacuse F/W change, M/B also change, please reference RSPL to modify. 2. Color wheel change, please reference RSPL to modify. 70.80N02.001 EP739/EP739H/EP738...
  • Page 56 LENS SUPPORT PC+ABS EP739 51.80N20.001 MYLAR FOR LVPS BOTTOM EP739 52.80N02.001 SPONGE FOR DMD CR-4305 EP739 52.80N11.001 SPONGE FOR LVPS-1 47*3 APU t=4.0mm EP739 52.80N12.001 SPONGE FOR LVPS-224.5*3 APU t=4.0mm EP739 52.88504.001 LVPS BOTTOM THERMAL PAD Fujipoly SARCON GR-b 26*21*3mm 61.00029.001 SCREW PAN MECH M3*5*D8 Ni 61.80N03.001...
  • Page 57 EP738 70.80Y02.001 EP739/EP739H/EP738...
  • Page 58 LENS SUPPORT PC+ABS EP739 51.80N20.001 MYLAR FOR LVPS BOTTOM EP739 52.80N02.001 SPONGE FOR DMD CR-4305 EP739 52.80N11.001 SPONGE FOR LVPS-1 47*3 APU t=4.0mm EP739 52.80N12.001 SPONGE FOR LVPS-224.5*3 APU t=4.0mm EP739 52.88504.001 LVPS BOTTOM THERMAL PAD Fujipoly SARCON GR-b 26*21*3mm 61.00029.001 SCREW PAN MECH M3*5*D8 Ni 61.80N03.001...
  • Page 59 EP739/EP738 Series 70.80N03.001: for EP739 only 70.80Y13.001: for EP738 series EP739/EP739H/EP738...
  • Page 60 Exploded Parts List Item Description 61.00068.001 HEX SPACER M3 H=40mm L=4mm AL EP739 61.80N17.001 KEYPAD SHIELDING AL+MYLAR EP739 75.80N04.001: for EP739 only ASSY BUTTON MODULE EP739 70.80N04.002: for EP738/EP738P 80.80N03.001 PCBA KEYPAD BD FOR EP739 85.ZA123.040 SCREW WCH/W MECH M3*4 Ni 42.89604.001...
  • Page 61 DMD HEATSINK BAKER PLATE A6061 Ivy10X "GREEN'' 61.88608G001 DMD HEATSINK SPRING PLATE SUS301 0.4t Ivy10X "GREEN" 61.88611G001 DMD SCREW Ivy10X "GREEN" 80.80N02.001 PCBA DMD BD FOR EP739 70.80N11.001 SUB ASSY ENGINE MODULE EP739 Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738...
  • Page 62 Exploded Parts List Item Description 61.80N11.001 LENS CLAMP SUS t=0. 5 mm EP759 51.80N05G.002 ZOOM RING PC+ABS EP738 51.80Y04.001 ZOOM RING STOPPER PC+ABS EP739 70.81T02.001 ASSY FPL05 ENGINE MODULE EP738P Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738...
  • Page 63 EP738 70.80Y01.001 EP739/EP739H/EP738...
  • Page 64 Exploded Parts List Item Description 52.81510.003 SILICON RUBBER for LAMP EP739 75.80N03.001 LIGHT CUT COVER MODULE EP739 85.1A626.050 SCREW PAN MECH M2.6*5 BLACK NYLOK 85.4A122.040 SCREW FLAT MECH M2*4 Ni 61.88505.001 LAMP BRACKET 1 SUS301 0.3t 2200MP 61.88506G001 LAMP BRACKET 2 SUS301 0.3t 2200MP ''GREEN"...
  • Page 65 EP739/EP738P 70.80N07.001 EP739/EP739H/EP738 7-11...
  • Page 66 Exploded Parts List Item Description 42.89608.001 W.A. 5P #28 140mm LAMP DRIVER TO MAIN BD EP759 51.00138.001 SPACER SUPPORT SCK-3A "PINGOOD" EP739 51.80N13.001 LAMP DRIVER HOLDER PC+ABS EP739 75.80N01.001 ASSY HITACHI LAMP DRIVER EP739 75.80N06.001 ASSY HITACHI LAMP DRIVER EP739X Note: Please refer to RSPL for updated part numbers.
  • Page 67 Description 42.89608.001 W.A. 5P #28 140mm LAMP DRIVER TO MAIN BD EP759 51.00141G.001 SPACER SUPPORT PG-KCA-3 "GREEN" 51.80N13.001 LAMP DRIVER HOLDER PC+ABS EP739 75.88503.001 ASSY USHIO LAMP DRIVER 2200MP Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738 7-13...
  • Page 68 EP739/EP738/EP738P 75.80N18.001 EP739/EP739H/EP738 7-14...
  • Page 69 Exploded Parts List Item Description 51.80N06.001 PUSH BUTTON PC+ABS EP739 51.80N19.001 MYLAR FOR IR SENSOR EP739 61.80N18.001 FRONT SHIELDING BRACKET EP739 85.WA126.050 .SCREW PAN TAP M2.6*5 Ni 51.80N02.001 FRONT COVER PC+ABS EP739 51.89618.001 IR SENSOR HOLDER PC 1225Y EP759 Note: Please refer to RSPL for updated part numbers.
  • Page 70 70.80N06.001 Exploded Parts List Item Description 51.80N16.001 MYLAR FOR PCBA MAIN EP739 52.80N07.001 M/B ABSORPTION NOISE CVS 15*t10mm L40 EP739 80.80N01.001 PCBA MAIN BD FOR EP739 80.81T01.001 PCBA MAIN BD FOR EP738P 80.80Y01.001 PCBA MAIN BD FOR EP738 Note: Please refer to RSPL for updated part numbers.
  • Page 71 EP739/EP738P 70.80N13.001 Exploded Parts List Item Description 52.80N06.001 SPONGE FOR BLOWER DUCT BF1000 t=3.3mm EP739 49.80N01.001 SUNON 70*20 R TYPE AXIAL FAN SUNON 70*20 R-TYPE AXIAL FAN, GM1207PKVX-A 70*70*20mm, 49.80N01G001 JST CONNECTOR,GREEN SUMITUDE "GREEN" 41.80N04G001 EMI GASKET W10*H6.5*L80 "GREEN" 52.80W01.001 RUBBER FOR FAN7020 2300MPX 61.80N07.001...
  • Page 72 SUNON 70*20 R-TYPE AXIAL FAN 52.80N06.001 SPONGE FOR BLOWER DUCT 41.80N04G.001 EMI GASKET W10*H6.5*L80 "GREEN" 51.89546.001 EDGE SADDLE DS-1 PIN GOOD 52.80W01.001 RUBBER FOR FAN7020 2300MPX 61.80Y08.001 BRACKET SECC EP738 Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738 7-18...
  • Page 73 EP739/EP738/EP738P 70.80N22.001 Exploded Parts List Item Description 42.80S07G001 W.A. 14P 190mm LVPS TO M/B TDP-T90 ''GREEN" 42.80N02.001 W.A. 2P #20 135mm LVPS/BALLAST EP739 75.81J01.002 ASSY LVPS QUASAR H30B Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738 7-19...
  • Page 74 EP739/EP738/EP738P 70.80N14.001 Exploded Parts List Item Description 52.87306.001 RUBBER BLOWER FAN FRAME 2100MP SUNON 50*20 R-TYPE BLOWER, GB1205PKV4-8AR, 50*50*20mm, JST 49.80N02G001 CONNECTOR, BLUE SUMITUDE, "GREEN" SUNON 50*20 R-TYPE BLOWER, GB1205PKV4-8AR, 50*50*20mm, JST 49.80N02.001 CONNECTOR, BLUE HEAT SHRINKABLE TUBING Note: Please refer to RSPL for updated part numbers.
  • Page 75 EP739/EP738/EP738P 70.80N15.001 Exploded Parts List Item Description 51.80N11.001 SPEAKER HOLDER PC+ABS EP739 49.88604.002 SPEAKER 8ohm 2W X16 EP759 Note: Please refer to RSPL for updated part numbers. EP739/EP739H/EP738 7-21...

  • Page 76: Appendix B

    EP738P This label “O80N333T0AAAA0002” represents the whole serial number for EP739/EP738 series, including Ver. 1st of BIOS and Ver. 1 of PCB Board. Both mechanical and optical version are 1st. In addition, panel vendor is T. It’ s produced on 33-week of 2004 for universal area and its serial code is 0002.

  • Page 77: Reader' S Response

    Thank you for your backing our service manual up. In order to refine our content of the service manual and satisfy your requirement. We expect you can offer us some precious opinions for reference. Assessment: What do you think about the content after reading EP739/EP738 series Service Manual? Unit Excellent...

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