Daewoo DR-C912B, Service Manual

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74
TROUBLESHOOTING
No power compensation.
Voltage of power fail (IC601
pin#100) at micom is 0.7V over?
More than 3.2V is maintained
for 1 minutes at IC601 pin#37
during Power Cord Open.
Check R625.
NO
YES
B. No power compensation.
YES
Check RESET circuit.
NO
Exchange IC601.
Noise appears on the
playback screen.
Is noise diminished by tracking
adjustment.
Noise band is trembled up and
down?
Re-adjust PATH.
Is the height of CTL HEAD normal?
No dust?
Is there problem in CTL Input
circuit and amplifier.
YES
NO
NO
NO
Is there CTL pulse at IC601
pin#97?
Check IC601.
Noise appears on the screen
even though changing tape.
Re-adjust the height of AC
HEAD. Remove the dust.
Check C651, C652, R651~R653
IC601 pin #91, 92, 98.
NO
Re-adjust PATH.
C-1. Bad playback quality (1)
YES
YES
YES
YES