LG FAS166F - CD Function Check

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ELECTRICAL TROUBLESHOOTING GUIDE
12. CD FUNCTION CHECK
CD function
Is MOT_open/close OK?
(IC402 Pin4, 5)
Check IC401.
(Motor drive IC)
OPU driving (Focusing &
Tracking) is OK?
Check VCC of IC400.
Replace crystal (IC500).
Check crystal (X400). Replace crystal (X400).
Is the PD(CN402 Pin20)
about 180 mV?
Is motor impedance OK?
(About 12 Ω)
Is no signal at SPK?
Check IC402.
Check OPU.
(Pick-up module)
Check loading motor.
Can the DISC insert?
DISC reading is OK?
Can’t see the
signal at Pin34, 35, 36
of IC400?
Check IC500
Input/Output and
control line
Can’t see the
signal(16.9344 MHz) at Pin31
of IC400.
NO
NO
NO
NO
NO NO
NO
NO
NO
NO
Is LOAD+/- OK ?
Focusing/Tracking
/Sled signal is OK?
YES
YES
YES
YES
YES
YES
YES YES
YES
NO
YES
Refer to function check.