Toshiba SD-33VB Service Manual page 74

C
No
Laser turns on when
reading disc?
Yes
No
Put disc in?
Yes
No
Disc ID is correct?
Yes
No
Does spindle rotate?
Yes
D
No
LD01 or LD02 output
properly?
Yes
Collector
No
voltage of power
transistor is OK?
( Q204, Q205)
Yes
Check cable connection between
transistor couput and pick-up head.
Laser off
No
Proper RFL signal
on MT1336?
Yes
Check the RFL connection
between MT1336 and MT1379.
Proper
No
DMSO signal on
MT1379
Yes
No
SP+ & SP- output
properly?
Yes
Check the cable connection
between spindle and main PCBA.
Check the laser power circuit
on MT1336 and connecting to
power transistor. (Q204, Q205)
Check therel ated ci rcuit on
laser power transi stor
Check the related circuit
on MT1336 RFL signal .
Check DMSO related
circuit on MT1379.
Check the spindle control
amp circuit of motor driver.
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