Sharp CD-K7000W Service Manual page 45

(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 PDO waveform. (Figure 45-1)
Check around pins 1~6 on IC2.
(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 IC2 "L"?
1. When playing at normal speed
Check the peripheral circuit at pin 37 (DOUT) on IC2 and
the waveform (Figure 45-2).
If both 1. and 2. are OK.
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No
Yes
CD-K7000W/C7000W,CP-C7000
Stopped
CH1=500mV
DC 10:1
PDO1
3
4
PDO2
T
FDO
1
=Filter= =Offset=
Smoothing : ON CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
There are too many error flags on a damaged disc which
makes error correction impossible.
Check again using a known good disc.
T
Stopped
CH1=2V
DC 10:1
T
1
DOUT
=Filter= =Offset=
Smoothing : ON CH1 : 0.00V
BW : FULL CH2 : 0.00V
CH3 : 0.00V
CH4 : 0.00V
– 45 –
1999/04/05 17:33:17
CH3=1V CH4=1V
500ms/div
DC 10:1 DC 10:1 (500ms/div)
NORM:20kS/s
CH1
v/DIV
500mV
=Record Length= =Trigger=
0.000V Main : 100K Mode : AUTO
0.0V Zoom : 2K Type : EDGE CH2
0.00V Delay : 0.0ns
0.00V Hold off : 0.2us
Figure 45-1
1999/04/07 09:25:28
500ns/div
(500ns/div)
NORM:200MS/s
=Record Length= =Trigger=
Main : 1K Mode : NORMAL
Zoom : 100 Type : EDGE CH1
Delay : 2.887ms
Hold off : 0.2us
Figure 45-2