JBL Soundgear Series, Service Manual

Page: 13 / 73

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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?
Does SMON signal appear
at pin of IC 802?
Does SMPO signal appear
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.
Defective IC 801, 803 and/or
peripheral circuit.
Defective disk motor and/or insulation.
(Focus servo turns
ON by FZC signal
of FOK mod.)
NO
NO
NO
NO
YES
YES
YES
YES
YES
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