3-15
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Only for training and service purposes
LGE Internal Use Only
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
3. RF/SERVO CIRCUIT
Laser off
Check the RFL connection
between J401 and MT1389.
Put Disc in.
NO
Check the related circuit on
MT1389 RFL signal .
NO
Disc ID is correct?
Proper RFL signal
on MT1389?
NO
YES
YES
YES
Check the cable connection
between spindle and main PCBA.
Check DMSO related circuit
on MT1389.
NO
Does spindle rotate.
Proper DMSO signal
on MT1389
NO
YES
Replace IC(U201)
YES
A
YES