Toshiba SD-2550A Service Manual page 45

N
Do signals output to N
pins 4 to 9 of CN501?
Y
Check IC502.
Fig. 1-3-11
Disc motor (D.M.) does not rotate.
Does pin 117 of IC401
(TP409) PLCK oscillate around
10 MHz ?
Y
Check peripheral circuits
of IC402.
Check disc motor and wiring.
Fig. 1-3-10
5
Focus servo is NG.
Are FE, RFSB,
FSON signals normal?
Y
Check peripheral circuit of IC605.
Check wiring for
pickup head.
Lens cleaning.
Replace pickup
mechanism.
1-41
4
N
Check peripheral
circuit of IC402.
Focus servo ON
signal waveform
Focus search
FE signal
Pin 150 (TP405)
of IC401
0.3V
1.65V
0.3V
RFSB signal
Pin 152 (TP503)
Focus servo on
of IC401
Fig. 1-3-12