Read Sony DVP-FX740DT Service Manual online
8-5
DVP-FX740DT
Put disc in?
Disc ID is correct?
Does
spindle
rotate?
rotate?
Focus on OK?
Track on OK?
Disc is play?
Check RF signal waveform
Proper signal
on A, B, C, D of
U7 (MT1389LP)?
Proper
F+&F- signal on
U7 (MT1389LP)?
Proper
FOSO signal on
U7 (MT1389LP)?
Check the related
circuit on U7 (MT1389LP)
Check the TRSO connection
on U7 (MT1389LP)
and motor driver
Check the tracking
control amp circuit
on motor driver
Proper
TRSO signal on
U7 (MT1389LP)?
T+&T- out
properly?
Check cable connection on pick up head
Check the cable connection on pick up head
Check the related
circuit on U7 (MT1389LP)
F+&F- signal
Check connection
between U7 (MT1389LP)
and pick up head
Check the RF
connection between HA1 and
U7 (MT1389LP)
Proper
DMSO signal on
U7 (MT1389LP)?
Check the cable connection between spindle and main PCBA
Check the related
circuit on U7 (MT1389LP)
RF signal
Check DMSO related
circuit on U7 (MT1389LP)
No disc (laser off)
4. RF/Servo Circuit
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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