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CD-MPX870W
(2) Tracking system check.
Check the TE waveform at pin 16 on IC1.
If the waveform shown in Figure 4 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 Figure 5)
2. The turntable doesn't rotate.
No
No
No
The tracking servo is not activated.
Yes
Check the peripheral circuits at pins 15, 16 and 23 on IC1,
and FFC1.
A normal jump operation cannot be completed or the begin-
Yes
ning of the track cannot be found.
Check the around pin 23 on IC1.
Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1)
system.
Stopped
CH1=10 V
CH2=1 V
DC 10:1
DC 10:1
TE
2
DRF
T
1
=Filter=
=Offset=
Smoothing : ON
CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
Yes
The spin driver circuit is OK.
Check around pin 25 on IC1, pins 5 and 6 on CNP2.
Stopped
CH1=200 mV
CH2=500 mV
DC 10:1
T
PDOUT 0
2
PDOUT 1
1
=Filter=
=Offset=
Smoothing : ON
CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
7 – 3
T
100 ms/div
(100 ms/div)
NORM:100 kS/s
=Record Length=
=Trigger=
0.0 V
Main :
100 K
Mode : NORMAL
0.00 V
Zoom :
2 K
Type : EDGE CH1
Delay :
2.924 ms
0.00 V
0.00 V
Hold off :
0.2 µs
Figure 4
T
1999/04/07 09:51:15
500 ms/div
DC 10:1
(500 ms/div)
NORM:20 kS/s
=Record Length=
=Trigger=
0.000 V
Main :
100 K
Mode : NORMAL
0.000 V
Zoom :
2 K
Type : EDGE CH2
Delay :
2.924 ms
0.00 V
Hold off :
0.00 V
Figure 5
0.2 µs
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