79
TROUBLESHOOTING
B. Playback picture doesn’t appear
YES
YES
Is Y signal output at IC301
pin#35?
Is Y signal input at IC301
pin#39?
Check and Replace IC301.
Playback picture doesn’t
appear.
Is C.S, DATA, CLOCK signal
input IC301 pin#53,54,55?
NO
NO
YES
Check EE mode
and OSD circuit
Check IC pin#61, 71, 72.
Is 5V obtained at IC301 pin#68?
Is 5V obtained at IC301
pin#23,44,45,68?
Check power circuit.
Clean or Replace HEAD.
Check power circuit.
YES
NO
Does X301(3.58MHz) oscillate?
Check Pattern.
NO
NO
YES
YES
YES
NO
Replace X301.
Is Video signal output at IC301
pin#26?
Replace IC301.
NO
YES
Is SW Pulse input at IC301
pin#57?
Is envelope output at IC301
pin#14?
YES
YES
Check IC601 pin#18.
NO
Replace IC301.
NO
NO
All manuals and user guides at all-guides.com
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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...
