Sharp XL-DK255 Service Manual - Page 56

Check the TE waveform at pin 16 on IC1., Focus-RF system check., Spin system check.

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XL-DK225 (2) Focus-RF system check. Check the TE waveform at pin 16 on IC1. If the waveform shown in Figure 4 appears and soon after NO DISC appears? No "Initialization" is possible, but play is not possible? No "Initialization" is not possible. Yes The tracking servo is not activated. Check the peripheral circuits at pins 15, 16 and 23 on IC1, and FFC1. Yes A normal jump operation cannot be completed or the beginning of the track cannot be found. Check the around pin 23 on IC1. Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1) system. 3 TE 16 IC1 4 IC1 2 RFOUT (3) Spin system check. Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation. Figure 4 1. The turntable rotates a little? (Waveform drawing Figure 5) No 2. The turntable doesn't rotate. Yes The spin driver circuit is OK. Check around pin 25 on IC1, pins 1 and 2 on CNP2. 1 FDO 22 IC1 5 SPDO 25 IC1 7 - 3 Figure 5

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XL-DK225
7 – 3
Check the TE waveform at pin 16 on IC1.
(2) Focus-RF system check.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pins 15, 16 and 23 on IC1,
and FFC1.
No
"Initialization" is possible, but play is not possible?
Yes
A normal jump operation cannot be completed or the
beginning of the track cannot be found.
Check the around pin 23 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1)
system.
Figure 4
IC1
IC1
TE
16
RFOUT
2
3
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?
(Waveform drawing Figure 5)
Yes
The spin driver circuit is OK.
No
2. The turntable doesn't rotate.
Check around pin 25 on IC1, pins 1 and 2 on CNP2.
Figure 5
IC1
IC1
22
25
5
1
FDO
SPDO