CD-K7000V,CP-C7000
– 48 –
Is pin 35 (C2F) on IC2 "L"?
Yes
No
The HF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound
has dropouts.
(5) Others
There are too many error flags on a damaged disc which
makes error correction impossible.
Check again using a known good disc.
1. When playing at normal speed
Check the peripheral circuit at pin 37 (DOUT) on IC2 and
the waveform (Figure 48-2).
If OK, check the unit.
When a disc is loaded, start play operation.
(4) PLL system check
The HF waveform is normal, but the TOC data cannot be
read.
Check the PDO waveform. (Figure 48-1)
Check around pins 1~6 on IC2.
Figure 48-1
Figure 48-2
T
FDO
PDO2
PDO1
Stopped
CH1=500mV
DC 10:1
CH3=1V
DC 10:1
CH4=1V
DC 10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
4
3
=Record Length=
Smoothing : ON CH1 : 0.000V
CH2 : 0.0V
Main : 100K
Zoom : 2K
Mode : AUTO
Type : EDGE CH2
Delay : 0.0ns
Hold off : 0.2µs
CH3 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger==Filter= =Offset=
CH1
v/DIV
500mV
1999/04/05 17:33:17
T
T
DOUT
Stopped
CH1=2V
DC 10:1
500ns/div
1999/04/07 09:25:28
(500ns/div)
NORM:200MS/s
1
=Record Length=
Smoothing : ON CH1 : 0.00V
CH2 : 0.00V
Main : 1K
Zoom : 100
Mode : NORMAL
Type : EDGE CH1
Delay : 2.887ms
Hold off : 0.2µs
CH3 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter= =Offset=
To Next Page
Loading...
Need help?
General
