VC-G20SM VC-G200SM VC-G201SM VC-G401SM - Cenatel

VC-G20SM/G200SM
VC-G201SM/G401SM
FLOW CHART NO.17 CAPSTAN SERVO TROUBLESHOOTING
Capstan servo does not function.
1
Only PB mode inoperative
Are REC and/or PB
Only REC mode inoperative
2
mode inoperative?
Check peripheral
circuit of pin(50)
of IC701, C716,
C715 and R708.
NO
Is the V-SYNC
signal(reference) at
pin(50) of IC701?
Does PB CTL
signal appear at
pin(76) of IC701?
NO
YES
Is there 14.318MHz
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
YES
YES
Is there REC CTL
signal output at
pins(75) and (74)
of IC701?
YES
Does the capstan
FG signal appear
at pin (67) of IC-
701?
NO
Check the capstan
FG signal line between
pin(1) of P701
and pin(67) of IC701.
NO
Check peripheral
circuit of P701.
Replace IC701.
Does A/C head
operate
normally?
NO
Replace A/C
head.
YES
Adjust the height
of the A/C head.
NO
YES
Replace IC701.
NO
Is there capstan
AFC signal at pin
(31) of IC701?
YES
Is there capstan
APC signal at pin
(33) of IC701?
YES
Dose pin(29) of
IC701 operate
normally?
YES
"
Check " 1
NO
NO
Does PB CTL
signal appear at
pin (76) of IC701?
NO
Replace IC701.
NO
" Check " 2
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