Goldstar FFH-296AX, FFH-1960 Service Manual TROUBLE

- 2-2 -

TROUBLESHOOTING

Turn power on.

Is power on?

Does initial read work?

Does it play?

Does it output audio?

Check power supply circuit.
PN508 PIN 8, 6.2V
PN508 PIN 7, 5V
IC503 PIN 2, 3.3V

Check the connector

PN502, PN503, PN507

Check the tracking servo circuit.

Check the PN508 PIN1, 3

OK

YES

YES

YES

YES

YES

YES

YES

YES

NO

NONO

Check the DISK turns

Check the Laser

Check the focus circuit

Check the TRAKING circuit

NO

NO

- 2-3 -

Fails to initial read

A

B

2V

5V

0V

5V

0V

1V

0V

1.2V

0V

0.8V

NO NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

Disc motor turns

Does RF waveform appear?

IC501 Pin4

Check the Data transmission from

PN507 pin8 to CD DSP

Check the Data transmission from

PN507 pin6 to MICOM

Check the change of SLDO

Voltage(IC501 pin23)

Check the change of SL +,

SL - Voltage

(IC502 pin 18, 19)

Check the Voltage change of PN 507

pin2(OPEN, CLOSE)

Defective connector

PN507

Defective connector

PN507 Defective

MICOM

Defective connector

PN507 Defective

IC501

Defective IC501

Defective IC502

Defective contact PN503

Defective PICK-UP

Does laser light?

focus coil drive wareform.

TRACKING ERROR wareform

Is rotation normal?

Defective IC501

Defective PICK-UP

Is there no dropout of RF signal?

Does FA+ waveform appear at

IC502 pin13?

Does TE waveform appear at

IC501 pin 15?

- 2-4 -

A

NO

NO

NO

NO

NO

NO

Laser does not light.

Is “3.5V” applied to pin 80 of IC 501?

Is power supplied to laser Q501?

(Q 501 collector: about 1.8V)

Does laser current flow?

1.0V across R508

Is data transferred from
MICOM IC ?

Does voltage appear at IC
502 pin 18,19 ?

Defective MICOM.

Defective MICOM.

Defective connector.

Defective IC 501, 502

Defective slide motor and/or
connector.

Defective LMT SW and/or
connector.

Defective Q 501 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 of
PN503?

R508»1.0V

R508«1.0V

YES

YES

YES

YES

OPEN

CLOSE

YES

YES

YES

YES

YES

YES

5

- 2-5 -

B

NO

NO

NO

NO

NO

YES

YES

YES

YES

Laser lights

Does lens move up/down?

Check the signal of

FOCUS SEARCH

(IC501 Pin 21)

Chekc the signal of PN502

pin 13, 14

Does FE signal appear?

(IC501 pin 13)

Does DRF signal appear? (IC 501 pin67)

Defective IC501

Defective IC502

Open activator and/or connector

Defective IC501

Degraded laser diode

Defective PICK-UP