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CONTENTS
SAFETY INFORMATION ......................................................................................................................................................... 2
1. SERVICE PRECAUTIONS.................................................................................................................................................... 7
1.1 NOTES ON SOLDERING ............................................................................................................................................... 7
2. SPECIFICATIONS................................................................................................................................................................. 9
2.1 ACCESSORIES.............................................................................................................................................................. 9
2.2 SPECIFICATIONS ........................................................................................................................................................ 10
2.3 PANEL FACILITIES....................................................................................................................................................... 11
3. BASIC ITEMS FOR SERVICE ............................................................................................................................................ 14
3.2 QUICK REFERENCE ................................................................................................................................................... 15
3.3 PCB LOCATION ........................................................................................................................................................... 17
3.4 JIGS LIST ..................................................................................................................................................................... 18
3.5 CLEANING ................................................................................................................................................................... 18
4. BLOCK DIAGRAM .............................................................................................................................................................. 20
4.1 OVERALL WIRING DIAGRAM (1/2)............................................................................................................................. 20
4.2 OVERALL WIRING DIAGRAM (2/2)............................................................................................................................. 22
4.3 OVERALL BLOCK DIAGRAM (1/2) .............................................................................................................................. 24
4.4 OVERALL BLOCK DIAGRAM (2/2) .............................................................................................................................. 26
4.5 POWER SUPPLY UNIT ................................................................................................................................................ 28
4.6 50F X DRIVE ASSY...................................................................................................................................................... 29
4.9 50F ADDRESS L and S ASSYS................................................................................................................................... 32
4.10 50F DIGITAL ASSY .................................................................................................................................................... 33
4.13 TANSHI ASSY ............................................................................................................................................................ 38
4.14 50FHD LED and FHD IR ASSYS ............................................................................................................................... 39
5. DIAGNOSIS ........................................................................................................................................................................ 41
5.1 POWER SUPPLY OPERATION.................................................................................................................................... 41
5.1.1 LED DISPLAY INFORMATION............................................................................................................................... 41
5.1.2 POWER ON SEQUENCE ...................................................................................................................................... 42
5.2.1 WHOLE UNIT......................................................................................................................................................... 45
5.2.2 POWER SUPPLY UNIT.......................................................................................................................................... 47
5.2.3 DRIVE ASSY.......................................................................................................................................................... 48
5.2.4 DIGITAL ASSY ....................................................................................................................................................... 52
5.2.5 MAIN ASSY............................................................................................................................................................ 53
5.2.6 VIDEO SYSTEM .................................................................................................................................................... 54
5.2.7 AUDIO SYSTEM .................................................................................................................................................... 60
5.4 DIAGNOSIS OF SD (SHUTDOWN) ............................................................................................................................. 67
5.4.2 SD (SHUTDOWN) DIAGNOSIS ............................................................................................................................. 68
5.5 NON-FAILURE INFORMATION .................................................................................................................................... 70
5.6 OUTLINE OF THE OPERATION .................................................................................................................................. 74
5.6.3 PROCESSING IN ABNORMALITY ........................................................................................................................ 76
5.6.4 TRAP SWITCH....................................................................................................................................................... 79
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