Goldstar ffh-576, ffh-576ax Service Manual

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TROUBLESHOOTING

Turn power on.

Is power on?

Does initial read work?

Does it play?

Does it output audio?

Check power supply circuit.

(Check PN 807)

Check laser circuit.

Check focus circuit.

Check disc.

Check tracking servo circuit.

Check audio circuit.

YES

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Fails to initial read

1.3V

YES

NO NO NONO

Does laser light?

Disc motor turns.

Does RF waveform appear?

TP 801(RF)

Does tracking servo work? Lower envelope of TP801(RF) waveform is flat.

Does signal appear at TP801(TEO)?

Does signal appear at IC 803 Pin and Pin ?

Does GFS (IC802 pin 25) show as below?

Is rotation normal?

Is there no dropout of RF signal?

Does TE2 signal appear at pin of IC801?

Defective IC 801, pick up and/or open wire.

Detective pattern.

Defective IC 801 and/or IC 803

Defective pick-up and/or connector.

Defective IC 801.

Scratch in disc initial read area.

Defective pick-up adjustment focus offset.

+ 4 hidden pages