LG GCC-4242N Service Manual page 57

Recognition Fail Case2:
DVD-RAM Disc Fail
Is Q303 Pin6 (linked to
R309 and R310) level 3.6V
or more?
OK
After Power On, does Pick up
move?
OK
Is there RF signal at PG301
Pin25(TL325)?
OK
Check
ARF waveform (IC101 Pin51) is
400~800mVpp?(TL114)
OK
OK
NG
Is PG301 34pin(TL330)
Check after replacing
Pickup unit. is it OK?
NG
Go to Focus Drive check.
NG
Check i) Soldering of PG301.
ii) Insertion or damage of Main FPC.
Replace the Pickup unit.
Check i) Voltage of TL334(5V).
ii) Voltage of TL332 (2.1V).
NG
iii) Dumping Reg R131-R136,RA103.
iv) Soldering of IC101.
V) Voltage of Vhalf.
Replace the IC101.
NG
Replace the IC101.
NG
Replace the Q303.
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