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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
NO
Collector voltage of
power transistor is OK?
YES
Check cable connection between
transistor ouput and pick-up
head.
Laser off
NO
Proper RFL signal
on MT1389?
YES
Check LDO1 & LDO2 signal
NO
Proper DMSO signal on
MT1389
YES
NO
SP+ & SP- output
properly?
YES
Check the cable connection
between spindle and main PCBA.
- 3-6 -
Check the laser power circuit
on MT1336 and connecting to
power transistor.
Check the related circuit on
laser power transistor
Check the related circuit
on MT1389 RFL signal.
Check DMSO related
circuit on MT1389.
Check the spindle control
amp circuit of motor
driver.
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