JBL SG3030
Manual de Servicio

C
YES

Does FE1 signal appear? IC 801

59

pin NO Defective IC 801. Open pick diode

YES

Does FZC signal (focus zero cross signal) appear at pin 31 of IC 801, ISTAT (SENSE) terminal?
FER ISTAT(SENSE)

NO

Defective IC 801.

(Focus servo turns ON by FZC signal of FOK mod.)

YES

Does SMON signal appear at pin 73 of IC 802? Does SMPO signal appear at pin 75 of IC 802? YES

NO

Defective Pattern between IC 801 and IC 802.

Is drive voltage applied to disk motor? NO Defective IC 801, 803 and/or peripheral circuit.

Start mode

YES

Defective disk motor and/or insulation.

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