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(4) PLL system check.
When a disc is loaded, start play operation.
The HF waveform is normal, but the TOC data cannot be read.
Check the PDOUT waveform. (Figure 6)
Check around pins 26~30 on IC1.
(5) Others.
The HF waveform is normal and the time is
displayed normally, but no sound is produced. Or
the sound has dropouts.
Is pin 35 (C2F) on IC1 "L" ?
1. When playing at normal speed.
Check the peripheral circuit at pin 69 (DOUT) on IC1 and the
waveform (Figure 7).
If OK, Check the unit.
Yes
Stopped
CH1=500 mV
DC 10:1
PDO0
3
4
PDO1
T
FDO
1
=Filter=
Smoothing : ON
BW : FULL
No
There are too many error flags on a damaged disc which makes
error correction impossible.
Check again using a known good disc.
Stopped
CH1=2 V
DC 10:1
T
1
DOUT
=Filter=
Smoothing : ON
BW : FULL
7 – 4
CD-MPX870W
1999/04/05 17:33:17
CH3=1 V
CH4=1 V
500 ms/div
DC 10:1
DC 10:1
(500 ms/div)
NORM:20 kS/s
=Offset=
=Record Length=
=Trigger=
CH1 :
0.000 V
Main :
100 K
Mode : AUTO
CH2 :
0.0 V
Zoom :
2 K
Type : EDGE CH2
Delay :
CH3 :
0.00 V
CH4 :
0.00 V
Hold off :
Figure 6
T
1999/04/07 09:25:28
NORM:200 MS/s
=Offset=
=Record Length=
=Trigger=
CH1 :
0.00 V
Main :
1 K
Mode : NORMAL
CH2 :
0.00 V
Zoom :
100
Type : EDGE CH1
CH3 :
0.00 V
Delay :
CH4 :
0.00 V
Hold off :
Figure 7
CH1
v/DIV
500 mV
0.0 ns
0.2 µs
500 ns/div
(500 ns/div)
2.887 ms
0.2 µs
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