LG TCH-800, Service Manual, Page: 9 / 36

- 2-5 -
(B) when laser light.
Do lenses move up and down?
Insert disc and
in the case of
check of initial
leading.
Is RF(HF) signal waveform
output?
NO
NO
Is signal output at focus search
terminal? IC101 Pin48 (CDP PCB)
NO
IC101(CDP PCB) defective.
Is signal output at IC301
Pin1, 2 (CDP PCB)?
NO
IC301 defective.
YES
YES
YES
Actuator short.
Connector short.
IC101(CDP PCB) defective.
Connector short.
The waveform of RF(HF) is
below figure?
Amplitude
0.5~1.0v
NO
YES
IC101(CDP PCB) defective.
TR1, IC101(CDP PCB)
surrounding circuitry defective.
Is FOK signal output? RF(HF)
0.4V over OK.
FOK
NO
YES
IC101(CDP PCB) defective.
Is FOK signal to IC201 Pin41?
(C)
FOK
NO
YES
Pattern defective.
YES