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TROUBLESHOOTING FLOW CHART
B.
NO NO
Playback picture
is not good.
NO NO
Check flow A.
YES
YES
YES
YES
Noise appears on the
screen on the whole.
Noise appears on the
screen at the bottom
Change Drum Ass'y
Is Enve. waveform
supplied to pin 4
of P T501?
Check connector,
and Head dust.
NO NO
YES
Check pattern
Check video circuit.
Check the PG
Adjustment.
Is SW-pulse applied to
video IC?
Is sw pulse supplied
from pin 18 of IC501?
Check D.PG input
and connector.