Rf/Servo Circuit - LG DP270B 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
D
NO
Laser off
NO
Proper RFL signal
on MT1389?
Check the RFL connection
between J401 and MT1389.
NO
Proper DMSO signal
on MT1389
Check the cable connection
between spindle and main PCBA.
3-15
NO
YES
NO
YES
Check the related circuit on
MT1389 RFL signal .
Check DMSO related circuit
on MT1389.