SHARP CD-B3000H Repair Manual

CD-BA3000H
(4) PLL system checkStopped1999/04/05 17:33:17
CH1=500mVCH3=1VCH4=1V500ms/div
DC 10:1DC 10:1DC 10:1(500ms/div)
NORM:20kS/s
PDO1
When a disc is loaded, start play operation.3
4
The HF waveform is normal, but the TOC data cannot be
PDO2
read.
T
FDO
1
CH1Check the PDO waveform. (Figure 41-1) v/DIV
500mV
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.000VMain : 100KMode : AUTO
BW : FULLCH2 : 0.0VZoom : 2KType : EDGE CH2
CH3 : 0.00VDelay : 0.0ns
CH4 : 0.00VHold off : 0.2?s
Check around pins 1~6 on IC2.
Figure 41-1
(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 35 (C2F) on IC2 "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 37 (DOUT) on IC2 and
Check again using a known good disc.
the waveform (Figure 41-2).
StoppedT1999/04/07 09:25:28
CH1=2V500ns/div
DC 10:1(500ns/div)
If OK, check the unit.NORM:200MS/s
T
1
DOUT
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.00VMain : 1KMode : NORMAL
BW : FULLCH2 : 0.00VZoom : 100Type : EDGE CH1
CH3 : 0.00VDelay : 2.887ms
CH4 : 0.00VHold off : 0.2?s
Figure 41-2
� 41 �