Rf/Servo Circuit - LG DP391B 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(U203)
YES
B
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Only for training and service purposes
NO
Laser off
NO
Proper RFL signal
on U203?
Check the RFL connection
between J401 and U203.
NO
Proper DMSO
signal on U203
Check the cable connection
between spindle and main PCBA.
3-23
NO
YES
NO
YES
Check the related circuit on
U203 RFL signal .
Check DMSO
related circuit on U203.
LGE Internal Use Only