CD-E250E
CD-E550E
(2) Tracking system check.
Check the TE waveform at pin 15 on IC401.
If the waveform shown in Figure 47-1 appears and soon afterThe tracking servo is not activated.
Yes
NO DISC appears ?Check the peripheral circuits at pins 14, 15 and 20 on IC401, and
FC401.
No
"Initialization" is possible, but play is not possible ?A normal jump operation cannot be completed or the beginning of
Yesthe track cannot be found.
NoCheck the around pin 20 on IC401.
Data cannot be read. Check the VCO-PLL (Pin73~78 on IC401)
"Initialization" is not possible.
system.
StoppedT
CH1=10 VCH2=1 V100 ms/div
DC 10:1DC 10:1(100 ms/div)
NORM:100 kS/s
TE
2
TDRF
1
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.0 VMain : 100 KMode : NORMAL
BW : FULLCH2 : 0.00 VZoom : 2 KType : EDGE CH1
CH3 : 0.00 VDelay : 2.924 ms
CH4 : 0.00 VHold off : 0.2 ?s
Figure 47-1
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
1. The turntable rotates a little ?The spin driver circuit is OK.
(Waveform drawing Figure 47-2)Yes
No
2. The turntable doesn't rotate.Check around pin 22 on IC401, pins 10 and 11 on IC402, and
CNS402.
StoppedT1999/04/07 09:51:15
CH1=200 mVCH2=500 mV500 ms/div
DC 10:1DC 10:1(500 ms/div)
NORM:20 kS/s
T
FDO
2
SPDO
1
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.000 VMain : 100 KMode : NORMAL
BW : FULLCH2 : 0.000 VZoom : 2 KType : EDGE CH2
CH3 : 0.00 VDelay : 2.924 ms
CH4 : 0.00 VHold off : 0.2 ?s
Figure 47-2
� 47 � |
ACEC
