LG LAC-M0510, Service Manual

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- 2-3 -
(3) INITIAL READING IS NOT CARRIED OUT.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES (with disc)
YES
YES
Slide motor moves
(With disc)
Spindle motor turns
WAVEFORM #1
Does RF waveform appear?
IC502 Pin8
WAVEFORM #2
Check the Data transmission from
CN503(18,20,21) to CD DSP
WAVEFORM #5
Check the Data transmission from
CN503 Pin19 to MICOM
WAVEFORM #5
Check the TRVP
Voltage
IC501 Pin31
Check the change of SL
+, SL - Voltage
IC504 Pin13,14
Check the Voltage change of
CN503 Pin10(6.4~6.8V)
Check the Voltage IC501 Pin31
(1.4V~1.8V)
Defective connector
CN503
Defective IC501
Defective connector
CN503
Defective MICOM
Defective connector
CN503
Defective IC504
Defective IC501
Defective IC504
Defective contact CN502
Defective PICK-UP
Laser light check
A
?
focus coil drive wareform.
TRACKING ERROR wareform
Is rotation normal?
Defective IC501
Defective PICK-UP
Is there no dropout of RF signal?
Does FA+ waveform appear at
IC501 Pin31?
WAVEFORM #3
Does TE waveform appear at
IC502 Pin21?
WAVEFORM #4
1.4~1.8V
3~4V