3-13
NO
NO
Check the laser power circuit between
ES8391 and power transistor
(Q405, Q406)
NO
YES
YES
Check cable connection
between P405 and pick-up head
Laser turns on
when reading
disc?
YESYES
DVDLD or CDLD
output properly?
Check the related circuit of laser
power transistor
NO
YES
Collector
voltage of power transistor
is ok? (Q405, Q406)
Put disc in tray
B
NO
Check the SPINDLE related
circuit on ES8391
NO
Check the cable connection
between P401 and MD
Does spindle
rotate?
YES
YES
YES
Proper spindle
signal on ES8391
Check the SPINDLE control of
motor driver (IC401)
NO
SPIN+ & SPIN- output
properly?
C
Laser off
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