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1
Only PB mode inoperative
Is there PB CTL
YES
signal at pin(76)
of IC701?
NO
Does A/C head
NO
operate normally?
YES
Adjust the height
of the A/C head.
FLOW CHART NO.17
Capstan servo does not function.
Only REC mode inoperative
Does REC and/or
PB mode inoperate?
YES
Is there 14.318MHz
YES
oscillation at pins
(37) and (38) of
IC701?
NO
Check peripheral
circuit of X701.
Check capstan
motor unit and/or
replace.
YES
Is there capstan
AFC and APC
at pins(31) and (33)
of IC701?
NO
Replace IC701.
Replace A/C head.
2
Check peripheral
Is there V-SYNC
NO
circuit of pin(50) of
signal(reference) at
IC701, C770, C771
pin(50) of IC701?
and R770.
YES
Is there REC CTL
signal at pins(75)
and (74) of IC701?
YES
Is there capstan
FG signal at pin
(67) of IC701?
NO
Check the capstan
FG signal line bet-
ween pin(6) of AC
connector and pin
(67) of IC701.
NO
Check peripheral
circuit of AC
connector.
NO
NO
Replace IC701.
NO
Is there capstan
YES
AFC signal at pin
(31) of IC701?
YES
Is there capstan
Is there PB CTL
NO
signal at pin (76)
APC signal at pin
(33) of IC701?
of IC701?
YES
Does pin(29) of
NO
IC701 operate
Replace IC701.
normally?
YES
NO
Check "1"
Check "2"
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