Sharp CD-BP160W Service Manual page 39

(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 39-1)
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 39-2).
If OK, check the Unit.
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
Figure 39-2
Yes
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
CD-BP160W/180W/1500W/1700W
Stopped
CH1=500mV
DC 10:1
PDO1
3
4
PDO2
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.
– 39 –
1999/04/05 17:33:17
CH3=1V CH4=1V
DC 10:1 DC 10:1
=Offset= =Record Length= =Trigger=
CH1 : 0.000V Main : 100K Mode : AUTO
CH2 : 0.0V Zoom : 2K Type : EDGE CH2
CH3 : 0.00V Delay :
Hold off :
CH4 : 0.00V
Figure 39-1
500ms/div
(500ms/div)
NORM:20kS/s
CH1
v/DIV
500mV
0.0ns
0.2us