CD-MPS1000
(2) Focus-HF system check.
Check the TE waveform at pin 17 on IC1.
If the waveform shown in Figure 4 appears and soon after NO The tracking servo is not activated.
Yes
DISC appears?Check the peripheral circuits at pins 16, 17 and 22 on IC1, and
FFC1.
No
"Initialization" is possible, but play is not possible?A normal jump operation cannot be completed or the beginning
Yes
of the track cannot be found.
Check the around pin 22 on IC1.
No
"Initialization" is not possible.Data cannot be read. Check the VCO-PLL (Pin76~80 on IC1)
system.
StoppedT
CH1=10VCH2=1V100ms/div
DC 10:1DC 10:1(100ms/div)
NORM:100kS/s
TE
2
TDRF
1
=Filter==Offset==RecordLength==Trigger=
Smoothing: ONCH1 :0.0VMain :100KMode : NORMAL
BW :FULLCH2 :0.00VZoom :2KType : EDGECH1
CH3 :0.00VDelay :2.924ms
CH4 :0.00VHoldoff :0.2?s
Figure 4
(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?YesThe spin driver circuit is OK.
(Waveform drawing Figure 5)
No
2. The turntable doesn't rotate.Check around pin 24 on IC1, pins 3 and 4 on IC2, and CNS3A/
CNS3B.
StoppedT1999/04/07 09:51:15
CH1=200mVCH2=500mV500ms/div
DC 10:1DC 10:1(500ms/div)
NORM:20kS/s
T
FDO
2
1SPDO
=Filter==Offset==RecordLength==Trigger=
Smoothing: ONCH1 :0.000VMain :100KMode : NORMAL
BW :FULLCH2 :0.000VZoom :2KType : EDGECH2
CH3 :0.00VDelay :2.924ms
CH4 :0.00VHoldoff :0.2?s
Figure 5
7 - 3 |
ACEC
