Read Sharp DK-KP95PH (serv.man3) Service Manual online
DK-KP95PH
4 – 3
The tracking servo is not activated.
Check the peripheral circuits at pins 114, 115, 117, 118 on IC1
and FFC1.
Check the peripheral circuits at pins 114, 115, 117, 118 on IC1
and FFC1.
(2) Tracking system check.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears ?
DISC appears ?
Check the TE waveform at pin 63 on IC1.
"Initialization" is possible, but play is not possible ?
No
Yes
A normal jump operation cannot be completed or the begining of
the track cannot be found.
Check the around pin 117 on IC1.
the track cannot be found.
Check the around pin 117 on IC1.
Yes
"Initialization" is not possible.
No
When a disc is loaded, start play operation.
The RF waveform is normal, but the TOC data cannot be read.
Check the PLL waveform. (Figure 6)
Check around pins 141~ 144 on IC1.
Data cannot be read. Check the VCO - PLL (Pin no. 141 ~144)
on IC1 system.
on IC1 system.
(3) Spin system check.
(4) PLL system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
then try starting the play operation.
1. The turntable rotates a little ?
(Waveform drawing Figure 5)
(Waveform drawing Figure 5)
Yes
2. The turntable does not rotate.
The spin driver circuit is OK.
Check around pin 114 on IC1, pins 5 and 6 on CNP2.
No
Figure 4
78
134
IC1
IC1
4
TE
RFOUT
7
118
114
IC1
IC1
1
FOP
SPOUT
3
142
143
IC1
IC1
5
PLLF
PLLFO
6
118
IC1
FOP
1
Figure 5
Figure 6
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