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DRUM SERVO TROUBLESHOOTING
I
Drum servo does not function.
Is there 16MHz
oscillation at ins (38)
and (39) of ICE801 ?
Is the reference voltage
In PB mode
I
Is there the drum FG
Is there the head
YES
signal at pin (67) of
switching pulse at pin
NO
Is there the drum
Check pin (3) of the
control output at pin
connector ME and the
drum motor.
Is there the drum
control voltage applied
connector ?
Check and replace the
drum motor.
I
NO
YES
ND
I
NO
YES
NO
Replace IC8801.
YES
Does the drum error
amplifier circuit of 1~7701
NO
operate normally ?
Is pin (62) of IC8801 in high
Check IC7701.
and C8811.
NO
Check the composite
sync. signal at pin (25)
of IC2201 and 42215.
,
YES
FLOW CHART NO. 1-l 1
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