2. SYSTEM CIRCUIT
6
TROUBLESHOOTING
No LED display.
Is 5V obtained at IC701
pin #9, 25?
Oscillation at IC701pin #1?
Specific GRID/SEG doesn t function.
Check R588, D857, L503, L860
Exchange IC701.
Check IC 701 pin #22~24, 27,
28, 30, 31.
Check IC 701 pin #10~12, 14~21.
NO
YES
YES
NO
NO
GRID output at PORT of IC701?
YES
SEG output at PORT of IC701?
Exchange IC701.
YES
A. LED DISPLAY
NO
Summary of Contents for HV-DX300A
Page 27: ...26 CIRCUIT DIAGRAM 1 POWER SUPPLY CIRCUIT DIAGRAM ...
Page 28: ...27 CIRCUIT DIAGRAM 2 SERVO SYSCON CIRCUIT DIAGRAM ...
Page 29: ...28 CIRCUIT DIAGRAM 3 VIDEO AUDIO CIRCUIT DIAGRAM ...
Page 31: ...30 CIRCUIT DIAGRAM 5 PIF CIRCUIT DIAGRAM ...
Page 32: ...31 CIRCUIT DIAGRAM 6 DVD CIRCUIT DIAGRAM ...
Page 33: ...32 CIRCUIT DIAGRAM ...
Page 34: ...33 CIRCUIT DIAGRAM ...
Page 35: ...34 CIRCUIT DIAGRAM ...
Page 36: ...35 CIRCUIT DIAGRAM ...
Page 37: ...36 PCB CIRCUIT BOARD 1 1 VCR MAIN ...
Page 38: ...37 PCB CIRCUIT BOARD 1 2 POWER ...