JVC XV-N650BEU Service Manual page 19

C
Laser
turns on when reading
disc?
YES
Put disc in?
YES
Disc ID is correct?
YES
Does
spindle rotate?
YES
D
LD_DVD or
NO
LD_CD output
properly?
YES
Collector
voltage of power transistor
is OK?
YES
Check cable connection
between transistor output
and pick-up head.
NO
Laser off
NO
Proper RF signal
on ZR36888?
YES
Check LD_DVD &
LD_CD signal
Proper
NO
SPINDLE_S signal on
ZR36888
YES
SP+ & SP- output
properly?
YES
Check the cable connection
between spindle and main
PCBA.
Check the laser power circuit
NO
on ZR36888 and connecting
to power transistor.
NO Check the related circuit on
laser power transistor
NO
Check the related circuit
on ZR36888 RFL signal.
NO
Check SPINDLE_S related
circuit on ZR36888.
Check the spindle control
NO
amp circuit of motor driver.
(No.YD119)1-19