LG / GOLDSTAR LPC140A
Instrukcja Serwisowa

IF INITIAL READING IS NOT CARRIED OUT (WITH DISC)
Does disc motor Rotate? YES Is HF waveform output? IC401 pin22 Does PN404 pin2 voltage change when open/close? YES NO Is IC400 pin38 voltage transmitted?
3V

NO

CN401 connector defective.

NO IC400 Defective.

0V

YES Check the change of SL +, SL - Voltage. (IC802 pin 13, 14)
1.2V 0V 0.8V

NO

IC402 Defective.

YES PICK-UP defective.

Does laser light? YES Is FA+ waveform output at IC402 pin3? focus coil drive wareform. YES Is TE waveform output at IC401 pin11? TRACKING ERROR wareform. YES Is rotation normal?

NO

A

YES Is HF signal normal without dropout? YES

IC401 defective. PICK-UP defective.

NO

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