Daewoo DV6T812N Service Manual page 8

B. No power compensation.
No power compensation.
YES
Voltage of power fail (IC601
pin#100) at micom is 0.7V over?
YES
More than 3.2V is maintained
for 1 minutes at IC601 pin#37
during Power Cord Open.
Exchange IC601.
C-1. Bad playback quality (1)
Noise appears on the
playback screen.
Is noise diminished by tracking
adjustment.
YES
Noise band is trembled up and
down?
YES
Is there CTL pulse at IC601
pin#97?
YES
Check IC601.
NO
Check R625.
NO
Check RESET circuit.
NO
Re-adjust PATH.
NO
Noise appears on the screen
even though changing tape.
NO
Is the height of CTL HEAD normal?
No dust?
Is there problem in CTL Input
circuit and amplifier.
7
TROUBLESHOOTING
YES
Re-adjust PATH.
NO
Re-adjust the height of AC
HEAD. Remove the dust.
YES
Check C651, C652, R651~R653
IC601 pin #91, 92, 98.