Sharp CD-M4000 - Maintenance

CD-M4000W/CP-M4000
If the waveform shown in Figure 43-1 appears and soon after
t
NO DISC appears ?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pins 14, 15 and 20 on IC1, and
CNSl A/B.
“Initialization” is possible, but play is not possible ?
1
1 Yes
-) A normal jump operation cannot be completed or the beginning of
the track cannot be found.
No
Check the around pin 20 on ICl.
v
“Initialization” is not possible.
I
Data cannot be read. Check the VCO-PLL system.
Figure 43-1
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
1. The turntable rotates a little ? (Waveform drawing -- The spin driver circuit is OK.
Figure 43-2)
Yes
No
-- -
2. The turntable doesn’t rotate.
Check around pin 22 on ICI, pins 15 and 16 on IC3, and CNSBAIB.
Figure 43-2
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