奇
菱
光電股份有限公司
Chi Lin Optronics Corp.
Doc. No
CS-72601
Version A3
Title
CHT-726 Level 1 Service Manual
Page
4 / 75
Contents
1.
Purpose.......................................................................................................................... 5
2.
Definition of service level............................................................................................. 5
3.
Specification.................................................................................................................. 5
4.
Structure of the Product .............................................................................................. 6
4.1
I/O Interface ........................................................................................................... 6
4.2
Exploded View (attached as Appendix II) ............................................................. 7
4.3
Detail description of parts shown in 4.2 Product exploded View.......................... 8
4.4
Composition of Level 1 Modules (Parts) ............................................................... 9
5.
Troubleshooting ......................................................................................................... 11
5.1
Troubleshooting Table ………………………………………………………….11
5.2
Block Diagram ………………………………………………………………….14
6.
Service Mode............................................................................................................... 15
6.1
Options: ................................................................................................................ 15
6.2.1
Video Formatter ........................................................................................... 15
6.2.2
DLP Vsync ................................................................................................... 15
6.2
Test Patterns:........................................................................................................ 16
6.2.1
DLP Test Patterns ........................................................................................ 16
6.2.2
Lens Checkerboard....................................................................................... 21
6.2.3
4 X 4 Checkerboard ..................................................................................... 21
6.2.4
Scaler Test Patterns ...................................................................................... 22
6.3
Adjust CW............................................................................................................ 23
6.4
CW Index ............................................................................................................. 23
6.5
VGA Auto Calibration ......................................................................................... 24
6.6
MST 9888 Comp YPbPr ...................................................................................... 24
6.7
AD9882 VGA RGB ............................................................................................. 24
6.8
SAA 7118............................................................................................................. 25
6.9
DLP RGB Gain Offset ......................................................................................... 25
7.
Firmware Updade ...................................................................................................... 26
8.
Replacement Procedure (Disassembly & Assembly) .............................................. 28
8.1
Replace The Lamp module .................................................................................. 28
8.1.1
Resetting Lamp Timer.................................................................................. 29
8.2
Replace Cooling Fans .......................................................................................... 31
8.2.1
Replace The Front Axial Fan ....................................................................... 33
8.2.2
Replace The Rear Axial Fan ........................................................................ 36
8.2.3
Replace The Blower Fan.............................................................................. 39
8.3
Replace The Keypad ............................................................................................ 48
8.4
Replace The Control Board.................................................................................. 51
8.5
Replace The Connection Board ........................................................................... 54
8.6
Replace The Video Module, The I/O Board, The Ballast, The Thermal Sensor,
and The Power Module ........................................................................................................ 57
8.7
Procedures for the video module adjustment ....................................................... 71
Appendix I : Spare Parts List for CHT 726.......................................................................... 75