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NO
Is there drum FG signal at pin(65)
of IC701?
Is there head switching pulse at
Check drum FG signal line.
pin(23) of IC701?
Are there drum APC output at pin(34)
of IC701 and drum AFC output at
pin(32) of IC701?
Is there drum control voltage input
at pin(2) of IC706?
Does the IC706 operate normally?
FLOW CHART NO.16
Drum servo does not function.
Is there 14.318MHz oscillation at
pins(37) and (38) of IC701?
In PB mode
YES
NO
See FLOW CHART NO.15.
YES
NO
Replace IC701.
YES
NO
Check line between pins(34) and
(32) of IC701 and pin(2) of IC706.
YES
Is pin(46) of IC701 in high
impedance?
YES
Replace drum motor.
NO
Check peripheral circuit of X701.
YES
In REC mode
YES
Is there V-SYNC signal(reference)
at pin(50) of IC701?
Check pin(50) of IC701, C770, C771,
R770 and their peripheral circuits.
YES
NO
Replace IC701.
NO
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