Rf/Servo Circuit - Sony DVP-FX850 Service Manual

4. RF/Servo Circuit

Put disc in?
YES
Disc ID is correct?
YES
Does
spindle
rotate?
YES
Focus on OK?
YES
Track on OK?
YES
DISC is play?
NO
Check the RF
NO
connection between J5
and MT1389
Proper
NO
DMSO signal on
MT1389
Check the cable connection between spindle and main PCBA
Proper signal
NO
on A, B, C, D of
MT1389
Proper
FO+ & FO signal
on MT1389
Check the cable connection on pick up head
Proper
NO
FOSO signal on
MT1389?
Proper
TRSO signal on
MT1389?
TR+ & TR out
properly?
Check cable connection on pick up head
NO
Check RF signal waveform
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
9-5
No disc (laser off)
Check the related
circuit on MT1389
RFL signal
Check DMSO related
circuit on MT1389
Check connection
between MT1389
and pick up head
Check the related
circuit on MT1389
FO+ & FO signal
Check the related
circuit on MT1389
Check the TRSO
connection on MT1389
and motor driver
Check the tracking
control amp circuit
on motor driver