Rf/Servo Circuit - Sony DVP-FX850 Service Manual

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4. RF/Servo Circuit

Put disc in?
YES
Disc ID is correct?
YES
Does
spindle
rotate?
YES
Focus on OK?
TE
L 13942296513
YES
Track on OK?
YES
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DISC is play?
.
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Check the RF
NO
connection between J5
and MT1389
NO
DMSO signal on
Check the cable connection between spindle and main PCBA
Proper signal
NO
on A, B, C, D of
FO+ & FO signal
on MT1389
Check the cable connection on pick up head
NO
FOSO signal on
TRSO signal on
TR+ & TR out
Check cable connection on pick up head
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y
NO
Check RF signal waveform
i
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2 9
8
NO
NO
Proper
NO
MT1389
YES
NO
MT1389
YES
Q Q
3 6 7 1 3 1 5
Proper
NO
YES
Proper
NO
MT1389?
YES
Proper
NO
MT1389?
YES
NO
properly?
YES
co
.
9-5
9 4 2 8
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
0 5 8 2 9 9 4 2 8
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
m
9 9
9 9