Goldstar FFH-976AX Service Manual tr u

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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 701)

Check laser circuit.

Check focus circuit.

Check disc.

Check tracking servo circuit.

Check audio circuit.

OK

YES

NO

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Fails to initial read

1.3V

A B

YES

NO

NO NO NONO

NO

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.

53

26

27

- 2-5 -

A

NO

Laser does not light.

Is “3.5V” applied to pin of IC 801?

Is power supplied to laser Q801?

(Q 801 collector: about 1.8V)

Does laser current flow?

1.0V across R801

Is data transferred from MICOM IC ?

Does voltage appear at IC 803 pin 11, 12?

Defective MICOM.

Defective connector.

Defective IC 801, 803

Defective slide motor and/or connector.

Defective LMT SW and/or connector.

Defective Q 801 and/or laser.

Defective laser and/or connector.

Did pickup return to

innermost circular?

Does it stop at inner pick circular after shift?

Is defect output from LM SW applied to pin 2 of PN803?

R801»1.0V

R801«1.0V

YES

OPEN

CLOSE

YES

70