Tracking System Check; Spin System Check - Sharp CD-DP2500W Service Manual

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CD-DP2500W/DK2500W

(2) Tracking system check

Check the TE waveform at pin 18 on IC1.
If the waveform shown in Figure 46-1 appears and soon after
NO DISC appears.
"Initialization" is possible, but play is not possible.
"Initialization" is not possible.

(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 46-2)
2. The turntable doesn't rotate.
No
No
No
The tracking servo is not activated.
Yes
Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on
IC2, and CNS1A/B.
A normal jump operation cannot be completed or the beginning of
Yes
the track cannot be found.
Check the around pin 23 on IC2.
Data cannot be read. Check the VCO-PLL system.
Stopped
CH1=10V
DC 10:1
TE
2
DRF
T
1
=Filter=
Smoothing : ON
CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
The spin driver circuit is OK.
Yes
Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.
Stopped
CH1=200mV
DC 10:1
T
FDO
2
SPDO
1
=Filter=
Smoothing : ON
CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
– 46 –
T
CH2=1V
100ms/div
DC 10:1
(100ms/div)
NORM:100kS/s
=Offset=
=Record Length=
=Trigger=
0.0V
Main :
100K
Mode : NORMAL
0.00V
Zoom :
2K
Type : EDGE CH1
0.00V
Delay :
2.924ms
Hold off :
0.00V
Figure 46-1
T
1999/04/07 09:51:15
CH2=500mV
500ms/div
DC 10:1
(500ms/div)
NORM:20kS/s
=Offset=
=Record Length=
=Trigger=
0.000V
Main :
100K
Mode : NORMAL
0.000V
Zoom :
2K
Type : EDGE CH2
0.00V
Delay :
2.924ms
Hold off :
0.00V
Figure 46-2
0.2us
0.2us

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