Rf/Servo Circuit - LG DP450G Service Manual

MAIN ELECTRICAL TROUBLESHOOTING GUIDE

3. RF/SERVO CIRCUIT

Put Disc in.
YES
Disc ID
is correct?
YES
Does
spindle rotate.
YES
Replace IC(U201)
YES
A
NO
Laser off
NO
Proper RFL signal
on MT1389?
YES
Check the RFL connection
between J401 and MT1389.
Proper
NO
DMSO signal on
MT1389
YES
Check the cable connection
between spindle and main
PCBA.
3-15
NO
Check the related circuit on
MT1389 RFL signal.
NO
Check DMSO
related circuit on MT1389.