Service manual

42
VC-A565U/H965U
FLOW CHART NO.15
Drum servo does not function.
Check peripheral circuit of X701.
Is there 14.318MHz oscillation at pins(37) and (38) of IC701?
NO
In PB mode
YES
In REC mode
Is there drum PG/FG signal at pin(47).
Is the V-SYNC signal(reference) at pin(41) of IC701?
YES
NO
NO
Check peripheral circuit of pin(41) of IC701, C715, C7716 and R708.
Check drum PG/FG signal line.
Is the head switching pulse at pin(18) of IC701 present?
NO
See FLOW CHART NO.14
.
YES
YES
Is the drum-error at pin(29) of IC701 present?
NO
Replace IC701.
YES YES
Is the drum control voltage applied to pin(2) of IC701.
YES
Is pin(25) of IC701 in high impedance?
NO YES
NO
Check lines between pin(29) of IC701 and pin(12) of P701.
Does the IC706 operate normally?
Replace IC701.
Replace drum motor.