78
TROUBLESHOOTING
A. EE screen doesn’t appear
EE screen doesn’t appear.
Is video signal input at
IC301 pin#28, 30, 32?
Is 5V obtained at IC301
pin#23, 44, 45, 52, 68?
Is C.S, DATA, CLOCK signal
input IC301 pin#53,54,55?
Is video signal output at
IC601 pin#52?
Check IC401, LINE JACK and
IF circuit.
Check power circiut.
Check IC pin#61, 71, 72.
NO
YES
YES
YES
NO
NO
NO
Is 5V obtained at IC601
pin#53, 98, 99?
YES
Is signal input at IC401
pin#2?
YES
NO
Check PCB pattern.
Is video signal output at
IC301 pin#26?
YES
NO
Check IC301 pin#24 QV-sync.
Is signal input at IC601
pin#50?
YES
NO
Is 12V obtained at IC401
pin#16?
Is C-sync signal input at
IC601 pin#58?
YES
NO
Check IC301 pin#25 and
PCB pattern.
YES
Check RF Output.
Check Line JACK output.
Check IC 601
YES
VIDEO CIRCUIT
NO
Check power circuit.
Check PCB pattern and replace
IC401
YES
NO
Check power circuit.
All manuals and user guides at all-guides.com
Summary of Contents for DR-C912B
Page 13: ...11 INSTRUMENT DISASSEMBLY All manuals and user guides at all guides com...
Page 39: ...37 EXPLODED VIEW 6 3 EXPLODED VIEW OF FL ASS Y All manuals and user guides at all guides com...
Page 44: ...42 WAVEFORMS VIDEO WAVEFORMS 480 4 6 20 34 All manuals and user guides at all guides com...
Page 114: ...NORMAL AUDIO BLOCK DIAGRAM 112 BLOCK DIAGRAM All manuals and user guides at all guides com...
Page 117: ...AMP BLOCK DIAGRAM 115 BLOCK DIAGRAM All manuals and user guides at all guides com...
