SHARP CD-BK2100V
Service Manual

CD-BK2100V

Check the TE waveform at pin 18 on IC1.
If the waveform shown in Figure 45-1 appears and soon after NO DISC appears. No "Initialization" is possible, but play is not possible. No Yes The tracking servo is not activated. Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on IC2, and CNS1A/B.

Yes

A normal jump operation cannot be completed or the beginning of the track cannot be found. Check the around pin 23 on IC2.

"Initialization" is not possible.

Data cannot be read. Check the VCO-PLL system.
Stopped CH1=200mV DC 10:1
T

CH2=500mV DC 10:1

1999/04/07 09:51:15 500ms/div (500ms/div) NORM:20kS/s

T

FDO
2

1

SPDO

=Filter= Smoothing : ON BW : FULL

=Offset= CH1 : 0.000V CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V

=Record Length= Main : 100K Zoom : 2K

=Trigger= Mode : NORMAL Type : EDGE CH2 Delay : 2.924ms Hold off : 0.2µs

Figure 45-1 (3) Spin system check
Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation.

1. The turntable rotates a little. (Waveform drawing 45-2) Yes No

The spin driver circuit is OK.

2. The turntable doesn't rotate.

Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.
Stopped
CH1=200mV DC 10:1
T

CH2=500mV DC 10:1

1999/04/07 09:51:15 500ms/div (500ms/div) NORM:20kS/s

T

FDO
2

1

SPDO

=Filter= Smoothing : ON BW : FULL

=Offset= CH1 : 0.000V CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V

=Record Length= Main : 100K Zoom : 2K

=Trigger= Mode : NORMAL Type : EDGE CH2 Delay : 2.924ms Hold off : 0.2µs

Figure 45-2

� 45 �