Goldstar ffh-216 Service Manual troub

- 14 -

TROUBLESHOOTING GUIDE

CD PART

Is the function selector in the CD position?

Is power turned ON?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

END

¥ Check power supply circuitry.

¥ Check laser circuitry.

¥ Check focusing circuitry.

¥ Check disc.

¥ Check tracking servo circuitry.

¥ Check Audio circuitry.

YES

- 15 -

1-1.8V

2.5V

1. If initial reading is not carried out (with disc)

YES

NO NO

Is IC601 pin 22 output waveform normal?

Door open

(3.2V~5V)

Door close(1.9V~2.5V)

Does laser light?

¥ Leaf SW contact defective.

¥ Connector defective.

¥ Pattern short.

Does disc motor rotate?

Is HF waveform output? IC501 pin 74

Is tracking servo operating?

Is the lower envelope of HF (RF) waveform flat?

Is signal output at IC501 pin 50?

Is signal output at tracking output IC502 pin 26, 27?

Does IC503 pin 25 (LKFS) as figure?

Is retation normal?

Is there any irregularity in frequency?

Is HF signal normal without dropout?

Is TER signal output, at IC501 pin 54?

¥ IC501

defective.

¥ Connector

defective.

¥ Pick up

defective.

¥ Pattern

defective.

¥ IC502 or pattern

defective.

¥ Pick up

defective.

¥ Connector

defective.

¥ IC501 or IC503

defective.

¥ PLL CIRCUIT

defective.

¥ Disc initial reading

damaged or defective.

¥ CLV

SERVO(R530, C535, C536, R531) circuit defective.

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