Sharp XL-HP500 Service Manual - Page 37

Tracking system check., Check the TE waveform at pin 15 on IC1., Spin

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(2) Tracking system check. Check the TE waveform at pin 15 on IC1. If the waveform shown in Figure 37-1 appears and soon after NO DISC appears ? Yes No "Initialization" is possible, but play is not possible ? Yes No "Initialization" is not possible. XL-HP500 The tracking servo is not activated. Check the peripheral circuits at pins 14, 15 and 20 on IC1, and CNS1A/B. A normal jump operation cannot be completed or the beginning of the track cannot be found. Check the around pin 20 on IC1. Data cannot be read. Check the VCO-PLL (Pin73~78 on IC1) system. Stopped CH1=10 V DC 10:1 T CH2=1 V DC 10:1 100 ms/div (100 ms/div) NORM:100 kS/s TE 2 T DRF 1 (3) Spin system check. Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation. =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.0 V CH2 : 0.00 V CH3 : 0.00 V CH4 : 0.00 V =Record Length= Main : 100 K Zoom : 2 K =Trigger= Mode : NORMAL Type : EDGE CH1 Delay : 2.924 ms Hold off : 0.2 µs Figure 37-1 1. The turntable rotates a little ? (Waveform drawing Figure 37-2) No 2. The turntable doesn't rotate. The spin driver circuit is OK. Yes Check around pin 22 on IC1, pins 26 and 27 on IC2, and CNS3A/B. Stopped CH1=200 mV DC 10:1 T CH2=500 mV DC 10:1 1999/04/07 09:51:15 500 ms/div (500 ms/div) NORM:20 kS/s T FDO 2 SPDO 1 - 37 - =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.000 V CH2 : 0.000 V CH3 : 0.00 V CH4 : 0.00 V =Record Length= Main : 100 K Zoom : 2 K =Trigger= Mode : NORMAL Type : EDGE CH2 Delay : 2.924 ms Hold off : 0.2 µs Figure 37-2

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– 37 –
XL-HP500
T
T
FDO
SPDO
Stopped
CH1=200 mV
DC
10:1
CH2=500 mV
DC
10:1
500 ms/div
1999/04/07
09:51:15
(500 ms/div)
NORM:20 kS/s
2
1
=Record Length=
Smoothing :
ON
CH1
:
0.000 V
CH2
:
0.000 V
Main
:
100 K
Zoom
:
2 K
Mode
:
NORMAL
Type
:
EDGE CH2
Delay
:
2.924 ms
Hold off
:
0.2
μ
s
CH3
:
0.00 V
CH4
:
0.00 V
BW
: FULL
=Trigger=
=Filter=
=Offset=
T
T
TE
DRF
Stopped
CH1=10 V
DC
10:1
CH2=1 V
DC
10:1
100 ms/div
(100 ms/div)
NORM:100 kS/s
2
1
=Record Length=
Smoothing :
ON
CH1
:
0.0 V
CH2
:
0.00 V
Main
:
100 K
Zoom
:
2 K
Mode
:
NORMAL
Type
:
EDGE CH1
Delay
:
2.924 ms
Hold off
:
0.2
μ
s
CH3
:
0.00 V
CH4
:
0.00 V
BW
: FULL
=Trigger=
=Filter=
=Offset=
The tracking servo is not activated.
Check the peripheral circuits at pins 14, 15 and 20 on IC1, and
CNS1A/B.
If the waveform shown in Figure 37-1 appears and soon after
NO DISC appears ?
(2) Tracking system check.
Check the TE waveform at pin 15 on IC1.
A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 20 on IC1.
"Initialization" is possible, but play is not possible ?
Data cannot be read. Check the VCO-PLL (Pin73~78 on IC1)
system.
"Initialization" is not possible.
Figure 37-1
Figure 37-2
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
(3) Spin system check.
The spin driver circuit is OK.
1. The turntable rotates a little ?
(Waveform drawing Figure 37-2)
Check around pin 22 on IC1, pins 26 and 27 on IC2, and CNS3A/B.
2. The turntable doesn't rotate.
No
Yes
No
Yes
Yes
No