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FLOW CHART NO.17 CAPSTAN SERVO TROUBLESHOOTING
Capstan servo does not function.
ls there oscillated
NO | check peripheral
10.0MHz at pins (31)
circuit of X701.
and (32) of 1€701?
Check composite-
SYNC. signal line and
filter. (R701~702,
C701~704)
appear at pin (64) of
1C701?
NO
Are there REC CTL
signals output at
pins (55) and (56) of
1€701?
Does the capstan FG
signal appear at pin
(44) of C701?
Check capstan FG
Replace IC701.
signal line between
the AC-MC harness.
NO
Replace IC701.
YES
Is there capstan APC
signal at pin (24) of
1€701?
Does PB CTL signal
appear at pins (52),
(53) of 1C701?
No
{Check line between
pins (52) , (53) and pin
YES | Check line between
pins (52), (53) and pin
(62) of 1C701.
(62) of 1€701.
YES
NO
1C701 operate
Parts.
YES
normally?
Check"@®"
Check"@"
YES
Is AA-MH harness
NO
Replace AA-MH
good?
harness.
YES
Does A/C head
NO
operate normally?
YES
Adjust the height of
the A/C head.
Replace A/C head.
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