Goldstar FFH-5670AX TROUBLESHOOTING

- 2-3 -

TROUBLESHOOTING

Turn power on.

Is power on?

Does initial read work?

Does it play?

Does it output audio?

Check power supply circuit. PN807 PIN5, 6.2V PN807 PIN7, 5V IC803 PIN 2, 3.3V

Check the connector

PN801, PN802, PN809

Check the tracking servo circuit.

Check the PN807 PIN1, 3

OK

YES

NO

NONO

Check the DISK turns

Check the Laser

Check the focus circuit

Check the TRAKING circuit

NO

- 2-4 -

Fails to initial read

A

B

2V

5V

0V

5V

0V

1V

0V

1.2V

0V

0.8V

NO NO

NO

YES

Disc motor turns

Does RF waveform appear?

IC801 Pin3

Check the Data transmission from

PN809 pin11 to CD DSP

Check the Data transmission from

PN809 pin13 to MICOM

Check the change of SLDO

Voltage(IC801 pin23)

Check the change of SL +,

SL - Voltage

(IC802 pin 18, 19)

Check the Voltage change of PN 809

PIN20(OPEN, CLOSE)

Defective connector

PN809

Defective connector

PN809, Defective

MICOM

Defective connector

PN809, Defective

IC801

Defective IC801

Defective IC802

Defective contact PN802

Defective PICK-UP

Does laser light?

focus coil drive wareform.

TRACKING ERROR wareform

Is rotation normal?

Defective IC801

Defective PICK-UP

Is there no dropout of RF signal?

Does FA+ waveform appear at

IC802 pin13?

Does TE waveform appear at

801 pin 15?

- 2-5 -

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 R808

Is data transferred from MICOM IC ?

Does voltage appear at IC 802 pin 17, 18?

Defective MICOM.

Defective connector.

Defective IC 801, 802

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 PN802?

R808»1.0V

R808«1.0V

YES

OPEN

CLOSE

YES

70

- 2-6 -

B

NO

YES

Laser lights

Does lens move up/down?

Check the signal of

FOCUS SEARCH

(IC801 Pin 21)

Chekc the signal of PN802

pin 13, 14

Does FE signal appear?

(IC801 pin 13)

Does DRF signal appear? (IC 801 pin67)

Defective IC801

Defective IC802

Open activator and/or connector

Defective IC801

Degraded laser diode

Defective PICK-UP

- 2-7 -

(CH1)

(CH2)

1. HF signal (RF signal ) waveform (IC801 pin 3) during normal play

2. EFM signal (IC801 pin 3)waveform during Normal Play

3. Focus coil drive waveform(IC802 pin13)

• When focus search failed or there is no disc on the tray

• Focus coil drive waveform(FDO: IC801 pin21) and DRF(IC801 pin67) when focus search is accomplished

4. Tracking coil drive waveform and TE during track traverse (1) When time division is 20mS/Div.1V/Div.

(2) When time division 1mS/Div, 1V/Div

(During forward track traverse)

(3) When time division is 0.5nS/div.

(During backward Track Traverse)

5. Feed motor drive waveform(IC 802 pin18) During normal play

CH1 : FOCUS COIL DRIVE

SIGNAL 2V/Div.

CH2 : DRF

CH1 : TRACKING COIL DRIVE

SIGNAL 2V/Div. (IC802 pin27)

CH2 : TRACKING ERROR(TE: IC801 pin15)

1V/Div.

(

CH2 : TRACKING COIL DRIVE (IC802 pin27)

SIGNAL 2V/Div.

CH2 : TRACKING ERROR (TE: IC801 pin15)

1V/Div.

(

CH1 : TRACKING COIL DRIVE (IC802 pin27)

CH2 : TRACKING ERROR (TE: IC801 pin15)

(

0.5V/Div. 500nS/Div.

(

1S/Div. 1V/Div.

(

1mS/Div. 1V/Div.

(

0.5V/Div. 5µS/Div.

(

2S/Div.

0.5V/Div.

OV

OV (CH1)

(CH2)

(CH1)

(CH2)

OV

WAVEFORMS OF MAJOR CHECK POINT