CONFIDENTIAL
WAVEFORMS
4 Troubleshooting
4-4
GH15H*
4-3 User Controls Don’t Work
No
Does the DC level change at
Pin 35 and 36 of IC301 when you
push the front panel button?
Check the buttons.
(SW801~SW808)
Yes
Refer to 4-4 No OSD Display.
4-4 No OSD
There is video but no OSD.
While pushing a front control button does
any pulse appear at Pin 46,47
and 55, 56 and 63,64 of IC105?
5
No
Do sync signals appear at Pin 44,
150 and 43 of IC105?
1
Replace IC105.
3
Yes
Replace IC105 or check its
related circuit.
Replace IC105 or check
its related circuit.
2
Replace CN251.
Replace IC251 and IC252.
Yes
No
5
Summary of Contents for GH15H series
Page 11: ...CONFIDENTIAL Memo 3 Disassembly and Reassembly 3 4 GH15H ...
Page 14: ...CONFIDENTIAL 4 Troubleshooting GH15H 4 3 1 5 6 7 2 3 4 WAVEFORMS ...
Page 18: ...CONFIDENTIAL GH15H 5 1 5 Exploded View and Parts List ...
Page 19: ...5 Exploded View Parts List 5 2 GH15H Memo CONFIDENTIAL ...
Page 31: ...Memo 6 Electrical Parts List 6 12 GH15H CONFIDENTIAL ...
Page 32: ...CONFIDENTIAL GH15H 7 1 7 Block Diagram ...
Page 33: ...CONFIDENTIAL 7 Block Diagrams 7 2 GH15H Memo ...
Page 34: ...CONFIDENTIAL 8 Wiring Diagram GH15H 8 1 8 Wiring Diagram ...
Page 35: ...Memo 8 Wiring Diagram 8 2 GH15H CONFIDENTIAL ...
Page 37: ...CONFIDENTIAL 9 2 GH15H 1 5 6 7 2 3 4 9 Schematic Diagrams ...
Page 39: ...CONFIDENTIAL 9 Schematic Diagrams 9 4 GH15H Memo ...
