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N
Check peripheral circuit of IC601.
Do signals output to
N
pins 4 to 9 of CN501?
Y
Check IC501.
Fig. 1-3-11
4
Disc motor (D.M.) does not rotate.
Does pin 117 of IC502
(TP511) PLCK oscillate around
10 MHz ?
Y
Check peripheral circuits
of IC510 and IC503.
Check disc motor and wiring.
Fig. 1-3-10
5
Focus servo is NG.
Are FE, SBAD,
FSON signals normal?
Y
Check wiring for
pickup head.
Lens cleaning.
Replace pickup
mechanism.
1-10
N
Check peripheral
circuit of IC503.
Focus servo ON
signal waveform
Focus search
Fig. 1-3-12
FE signal
Pin 150 (TP504)
of IC502
0.3V
1.65V
0.3V
SBAD signal
Pin 152 (TP506)
Focus servo on
of IC502
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