CD-XP250E
(4) PLL system check.Stopped1999/04/05 17:33:17
CH1=500 mVCH3=1 VCH4=1 V500 ms/div
DC 10:1DC 10:1DC 10:1(500 ms/div)
NORM:20 kS/s
When a disc is loaded, start play operation.PDO1
3
4
The HF waveform is normal, but the TOC data cannot be
PDO2
read.
T
FDO
1
Check the PDO waveform. (Figure 40-1)CH1 v/DIV
500 mV
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.000 VMain : 100 KMode : AUTO
BW : FULLCH2 : 0.0 VZoom : 2 KType : EDGE CH2
CH3 : 0.00 VDelay : 0.0 ns
CH4 : 0.00 VHold off : 0.2 ?s
Check around pins 73~78 on IC1.
Figure 40-1
(5) Others.
The HF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound
has dropouts.
No
Is pin 52 (C2F) on IC1 "L" ?There are too many error flags on a damaged disc which
makes error correction impossible.
Yes
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC1 and
Check again using a known good disc.
the waveform (Figure 40-2).
StoppedT1999/04/07 09:25:28
CH1=2 V500 ns/div
DC 10:1(500 ns/div)
If OK, Check the unit.NORM:200 MS/s
T
1
DOUT
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.00 VMain : 1 KMode : NORMAL
BW : FULLCH2 : 0.00 VZoom : 100Type : EDGE CH1
CH3 : 0.00 VDelay : 2.887 ms
CH4 : 0.00 VHold off : 0.2 ?s
Figure 40-2
� 40 � |
ACEC
