Mitsubishi Electric DD-5000, Service Manual, Page: 14 / 76

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