Read JBL SG 2020 Service Manual online
-13-
FER
ISTAT(SENSE)
C
Start mode
Does FE1 signal appear? IC 801 pin
Does FZC signal (focus zero cross signal)
appear at pin of IC 801, ISTAT (SENSE)
terminal?
appear at pin of IC 801, ISTAT (SENSE)
terminal?
Does SMON signal appear
at pin of IC 802?
at pin of IC 802?
Does SMPO signal appear
at pin of IC 802?
at pin of IC 802?
Is drive voltage applied to disk motor?
Defective IC 801.
Open pick diode
Defective IC 801.
Defective Pattern between IC 801 and
IC 802.
IC 802.
Defective IC 801, 803 and/or
peripheral circuit.
peripheral circuit.
Defective disk motor and/or insulation.
(Focus servo turns
ON by FZC signal
of FOK mod.)
ON by FZC signal
of FOK mod.)
NO
NO
NO
NO
YES
YES
YES
YES
YES
59
31
73
75
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