13VT-K100/150
13VT-CK10
46
NO
NO
NO
NO
NO
NO
NO
NO
DRUM SERVO TROUBLESHOOTING
FLOW CHART NO.1-10
Drum servo does not function.
YES
YES
YES
YES
YES
YES
YES
YES
See FLOW CHART NO.
1-8.
Is pin (76) of IC7701 in
high impedance?
Replace IC7701.
Replace IC7701.
Check X7701, C7705 and
C7706.
Check the signal line of
drum PG.
Is there 16MHz oscillation
at pins (38) and (39) of
IC7701?
Is there the durm PG
signal at pin (86) of
IC7701?
Check the composite
sync. signal at pin (14) of
IC2201, Q2201 and
Q2202.
Is there the head
switching pulse at pin (18)
of IC7701?
Is there the drum FG
signal at pin (87) of
IC7701?
Is there the drum control
output at pin (78) of
IC7701?
Check the signal line
between pin (7) of AD
and pin (76) of IC7701.
Check PG and FG to pins
(5) and (3) of the connector
ME and the drum motor.
Is there the drum control
voltage applied to pin (1)
of ME connector?
Check AT 12V at pin (4)
and AT 5V at pin (7) of
ME connector.
Check and replace the
drum motor.
Is there the reference
signal (V-sync.) at pin
(84) of IC7701?
In REC mode
In PB mode