Goldstar FFH-879AX, FFH-786 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

- 2-8 -

VKK PART

Does DC - 33V appear at

CN302 Pin .

Check the Voltage of IC301

pin51

Dose -33V appear at

ZD704(-)

Check the Q701

TURN ON

Check the PATTERN

Replace the ZD704

Replace the Q701

Refer to power circuit

END

Check the -33V(LOW)

of C740

Replace the D709,

D710

YES

NO

P-SENS PART

Does +5V appear at ZD701?

Check the pattern of

IC301 Pin .

Check the waveform

of D708(cathod).

Check the R743 and

replace ZD703.

Replace the D708.

YES

NO

26

28

- 2-9 -

Power Circuit

Muting circuit (MUTE)

Check the Fuse

Check the DC output

of C770(+), C720(-)

Check the DC Output of

C728(+), C778

Check the Voltage

output of IC704, IC707, IC717

Check the Voltage

Output of IC705, IC706

Check the 5V of CN513

pin 7(CD FUNCTION)

END

Dose “Low” appear at

Q402 “B”

check the “High” of Q401,

Q451 “B”

MUTE

Replace the Fuse

Check the AC Output of

CN701 pin1, 2, 5, 6

Check the AC Output of

CN701 PIN 7, 8

Replace the IC704

Replace the D720

Replace the D720, D721,

D722, D723

Check the IC704, IC707,

IC717

Check the “High” of

IC301 pin82

Check the “Low” of Q791“B”

Check the connector of

Q402 “B” and GND

Replace the TR

Check the Q791, CD Ass’y

Check the power Ass’y or

Replace the Transformer

Check the power Ass’y

or Replace the

Transformer

Check the 5V of IC301

PIN17, 46, 72 ,90

Replace the Q792

Check the “High” of

IC203 pin 14

Check the IC203

YES

NO

- 2-10 -

Audio abnormal

SPK Relay Troubleshooting

Check the output of

IC401 Pin 24, 25

Refer to “IC401

Troubleshooting”

Refer to “Muting

Troubleshooting”

Check the Valtage of IC701, pin

1, 2, 5, 6 & Check the power

circuit

Refer to “Spk Relay

troubleshooting”

Refer to “power circuit”

Check “High” of Q763 “B”

Refer to “IC203

Troubleshooting”

Replace the RELAY(RY710)

Replace the Q763

Check the input of

IC701 pin14, 18

Check the Output of IC701,

pin8, 9, 10, 11

Check the RY701

END

Check the 12V of R794(+)

Check the “Low” of Q763 “C”

Check the output

END

YES

NO

- 2-11 -

FUNCTION MODE Audio abnormal

TAPE

Check the signal input of IC401 pin 28, 37

Refer to “IC202 Troubleshooting”

AUX

Chekc the signal input of IC401, pin 29, 36

Check the signal input of JK401

Check the signal input of IC401 pin 31, 34

Check the signal of CN513 pin 1, 3 or

Refer to “CD Troubleshooting”

Check the signal input of IC401 pin 30, 35

Refer to “IC102 Troubleshooting”

CD

Tuner

Check the “Low” of Q205 “B”

Refer to “IC504 Troubleshooting”

MIC

- 2-12 -

Refer to “IC301

Troubleshooting”

IC301 Troubleshooting

IC203 Troubleshooting

Check the power supplying IC301 Pin 17, 46, 72, 90?

Refer to “Power Circuit Troubleshooting”

Check the P-SENS

Replace the X301

Check the RESET circuit

Refer to “Power Circuit Troubleshooting”

Check the Data of IC301 Pin 3, 4

(CD ➞ TAPE FUNCTION)

Replace the

IC203

Check the pattern

of (IC301 & IC203)

Check the 5v of IC301 pin26

Check the oscillation of X301

When power supplying to IC301 pin11.

(High ➞ Low ➞ High)

Replace the IC301

Check the power supplying to IC203 pin16

Check the CLK Data of IC203 pin 2, 3

Check the CONTROLL function

END

YES

NO

- 2-13 -

IC401 Troubleshooting

IC701 Troubleshooting

Check the power supplying to IC401 Pin 39

Refer to “Power Circuit Troubleshooting”

Check the IC301 pin 85, 86, 75, 76

Check the PATTERN of MICOM

(85, 86)& IC401(21, 22)

Refer to “Muting Troubleshooting”

Refer to “power circuit Troubleshooting”

Replace the IC401

Replace the “IC301

Troubleshooting”

Replace the IC401

Check the Pulse waveform of IC401 pin21, 22

(VOL DIAL)

Check the Output of IC401 pin 32, 33

Check the waveform Output of IC401 pin24, 25.

Check the signal input of pin 14, 18

Check the power of pin1, 2 (+) pin 5, 6 (-)

Check the signal Output of pin 8, 9, 10, 11

END

YES

NO

- 2-14 -

FM (TUN101)

Check the 10V input of TUN101 B+ 6

Check the “High” Voltage of TUN101 VT 5

Check the OSC waveform of TUN101 Pin 8

Refer to “IC102 Troubleshooting”

Check the 12V of Q102 “E”

Refer to “Power

Circuit Trouble-

shooting”

Check the “LOW” of IC103 Pin 7

Refer to “IC103

Troubleshooting”

Replace the Q102

Replace the TUN101

YES

NO

IC102 Troubleshooting

Check the power supplying(10V) to pin8

Check the waveform of Pin 20, 21

Check the waveform output of Pin 16, 17

END

Refer to “Power Circuit

Troubleshooting”

Check the FM(TUN101) & AM(L107)

Replace the IC102

Check the “Low” of Pin 13

Refer to “IC103

Troubleshooting”

YES

NO

- 2-15 -

IC103 Troubleshooting

Check the power supplying to pin 17

Check the oscillation of X104

Check the waveform of CE, DI, DO, CLK

Is the normal ?

END

Refer to “Power Circuit

Troubleshooting”

Replace the X104

Check the line orrefer to “IC 301 Troubleshooting”

CE: Chip Enable

DI: Data Input(from u-com)

DO: Data Output(to u-com)

CLK: Tuner mode clock

Replace the IC103

YES

NO

AM•COIL Troubleshooting

Check the “High” of L107 Pin 2

Refer to “IC103 Troubleshooting”

Replace the L107

Check the oscillation of L107 Pin 13

Refer to “IC102 Troubleshooting”

YES

NO

Play

Check the VCC supplying to IC202 pin 18

Refer to “Power Circuit Troubleshooting”

Check the Deck Mecha

Replace the Deck

Mecha.

Replace the IC202

Check the signal output of IC202 pin 5, 20

Check the Muting Circuit

YES

NO

- 2-16 -

REC (Q252, Q202 ON / R273, R223 High)

Check signal supplied to IC202 pin 11, 14?

Check the output of IC202 Pin9, 16

Check the IC201 pin6 : 12V and pin 4 : High

Check the power or Refer to “IC203

Troubleshooting”

Check the power

supplying to C236(+)

Check the 0.6V of Q208

“B”

Check the “Low” of

Q208 “C”

Replace the Q207

END

Check the Vcc power of IC202 Pin18

Check the oscillation of L203 pin 2, 3

Replace the DECK

Check the “Low” of Q253,

Q203 “B”

Replace the Q253, Q203

Refer to “IC203

Troubleshooting”

Refer to “Power Circuit

Troubleshooting”

Refer to “IC203

trouleshooting”

Replace the Q208

Replace the L203

YES

NO

- 2-17 -

YES

NO

Dubbing(“NORMAL or REC “//“HIGH”)

Q252, 202 “OFF”//“ON” : R273, 223

“LOW”//“HIGH

Q253, 203 “ON”//“OFF” Refer to “IC203 Troubleshooting”

Refer to “REC Troubleshooting”

Goldstar FFH-879AX, FFH-786 TROUBLESHOOTING

Specifications and Main Features

Frequently Asked Questions

User Manual