Sharp CD-C250X BK Service Manual page 17

l
Play operation is performed when disc exits.
Although HF waveform is normal,
1 .oo v
ICI @ FD
Figure 17-l
Although MF waveform is norm& 'and the &me
l
indication is,normat, no.srrund is emRted.
Check IC 2
Check IC2 pins 48, 49, 52, and 53 (Fig. 17-2,3).
Check the periphery of IC3 (OPAMP).
Yes
Stop --> Play
Yes
1
Check PDO waveform (Fig. 17-1).
Check the ICl pins 43 and 44, IC2 pins 3,5,7, 10, and 11.
As VCO freque-
ncy is locked at
4.32 M Hz,
voltage of PDO
rises and stabili-
zes.
Usually, the number of pulses of flawless disc is 100 pulsesisec
2.00 v
2.00 v
2.00 v
Error
Figure 17-2
Figure 17-3
In STOP stat-
e CHP/CHN
clocks are the
same. and o-
utput is not
g i v e n . -~
Due to diffe-
rence in wa-
veform of
(duty ratio)
in PLAY
mode output
is given.