Acer AF705, Руководство по обслуживанию

Страница: 2 / 88

2
Table of Contents
1. DISPLAY ALIGNMENT............................................................................... 3
A. TIMING & DISPLAY SIZE ....................................................................................................................... 3
B. PICTURE POSITION .............................................................................................................................. 3
C. LINEARITY ............................................................................................................................................. 3
D. ALIGNMENT PROCEDURE ................................................................................................................... 3
E. GEOMETRIC DISTORTION ................................................................................................................... 4
F. WHITE BALANCE ALIGNMENT.............................................................................................................. 5
2. CONTROL AND CONNECT LAYOUT ....................................................... 7
A. MAIN PCB .............................................................................................................................................. 7
C. PIN ASSIGNMENT ................................................................................................................................. 9
3. INTRODUCTION: ..................................................................................... 10
A. POWER SUPPLY ................................................................................................................................. 10
B. DEFLECTION: ...................................................................................................................................... 10
C. VIDEO: ................................................................................................................................................. 10
D. DIGITAL CONTROLLOR: ..................................................................................................................... 10
4. POWER SUPPLY ..................................................................................... 12
A. RECTIFIER AND FILTER CKT:............................................................................................................. 13
B. FLYBACK AND PWM CKT :.................................................................................................................. 13
C. SNUBBER CKT:.................................................................................................................................... 13
D. SYNCHRONIZED CKT: ........................................................................................................................ 13
E. POWER SAVING CKT: ......................................................................................................................... 13
F. DEGAUSS CKT: .................................................................................................................................... 14
G. OVERLOAD PROTECTION CKT:......................................................................................................... 14
5. DEFLECTION ........................................................................................... 14
A. SYNC RPOCESSOR: ........................................................................................................................... 15
B. HORIZONTAL PROCESSOR ............................................................................................................... 15
C. VERTICAL OUTPUT............................................................................................................................. 15
D. HORIZONTAL OUTPUT STAGE........................................................................................................... 15
E. FLYBLACK TRANSFORMER ............................................................................................................... 15
6. VIDEO AMP. CIRCUIT.............................................................................. 17
A. VIDEO PRE. AMP. ................................................................................................................................ 18
B. VIDEO AMPLIFIER ............................................................................................................................... 18
7. TROUBLESHOOTING ............................................................................. 19
A. POWER SUPPLY CHECK .................................................................................................................... 20
B. MONITOR CHECK FLOW CHART ....................................................................................................... 21
APPENDIX A: PARTS LIST ....................................................................... 23
APPENDIX B: P. C. B. ASSEMBLY ............................................................ 57
APPENDIX C: DISPLAY UNIT ASSEMBLY ............................................... 75
APPENDIX D: CRT & YOKE ASSEMBLY .................................................. 79