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IF INITIAL READING IS NOT CARRIED OUT (WITH DISC)
Does disc motor Rotate?
YES
Is HF waveform output?
IC401 pin22
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?
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Only for training and service purposes
Does PN404 pin2 voltage change
when open/close?
YES
Is IC400 pin38 voltage transmitted?
NO
3V
0V
YES
Check the change of
SL +, SL - Voltage.
(IC402 pin 17, 18)
YES
NO
YES
NO
CN401 connector defective.
NO
IC400 Defective.
NO
1.2V
IC402 Defective.
0V
0.8V
PICK-UP defective.
A
Is HF signal normal without dropout?
NO
- 2-3 -
YES
IC401 defective.
PICK-UP defective.
LGE Internal Use Only
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