Cd Function - LG CJ44 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

9. CD FUNCTION

CD FUNCTION
YES
Can the
disc insert?
YES
Disc reading
is ok?
YES
Is no signal at spk?
YES
Check
the signal of IC401
Pin52,53,54.
YES
Check
the signal (16.9344
MHz) at IC401
Pin51.
YES
Check IC500
input/output and
control line.
YES
Refer to function check.
NO
Is load +,- ok?
Is Motor ok? (about 12 Ω)
NO
IM driving
(Focus and tracking) is ok?
NO
Check Vcc of IC401.
NO
Check Cristal (X400).
NO
Replace IC500.
3-25
NO
YES
NO
NO
NO
Is Motor_open/close OK?
(IC400 Pin9,10)
YES
Check IC400.
Check loading motor.
Check IC400
(Motor drive IC).
NO
Focus,
tracking, sled signal
is ok?
YES
Is the MD(CN400 Pin7)
about 190 mV?
NO
Check IM (pick-up).
Replace Cristal (X400).