JVC XV-N350B Service Manual page 18

ELECTRICAL TROUBLESHOOTING GUIDE
C
Laser
turns on when reading
disc?
YES
Put disc in?
YES
Disc ID is correct?
YES
Does spindle rotate? Does spindle rotate?
YES
D
DVD_LD,
NO
CD_LD output properly?
Collector
voltage of power transistor
is OK?
Check cable connection
between transistor ouput
and pick-up head.
NO
Laser off
NO
Proper RF signal
on OPU
Check DVD_LD &
CD_LD signal
NO
Proper spindle_s
signal on ZR966
SP+ & SP- output properly?
Check the cable connection
between spindle and main
PCBA.
3-7
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check the laser power circuit
on ZR966 and connecting to
power transistor.
Check the related circuit on
laser power transistor
Check the related circuit
on RF signal.
Check spindle_s related
circuit on ZR966.
Check the spindle control
amp circuit of motor driver.