LG GCC-4520B Service Manual page 57

Laser operating is abnormal
Execute 'B.Check ALPC Parameters'
of 'How to use Test Tool'
NO
Is EEPROM Data valid?
YES
Execute 'D.Laser Inspection' of
Execute 'C.Laser Power Setup' of
'How to use Test Tool'
'How to use Test Tool'
YES
E
At 'Test CD Read Power'
NG?
NO
YES
F
At 'Test CD Write power'
NG?
NO
Normal
60