Sharp XL-UH260 Service Manual - Page 86

Check the TE waveform at pin 31 on IC3.,

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XL-UH260 (2) Focus-RF system check. Check the TE waveform at pin 31 on IC3. 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. The tracking servo is not activated. Check the peripheral circuits at pins 32, 31 and 34 on IC3, pins Yes 4, 5, 10 and 11 on IC1, pins 17, 18, 35 and 36 on IC2 and FFC1. A normal jump operation cannot be completed or the beginning of the track cannot be found. Yes Check the around pin 34 on IC1. Data cannot be read. Check the VCO-PLL (Pins 16~19 and 21 on IC3) system. 4 IC3 31 1 IC3 33 (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. The spin driver circuit is OK. Yes Check around pin 41 on IC3, pins 3, 4, 13 and 14 on IC2. 1 IC3 33 6 IC3 41 7 - 3 Figure 5

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XL-UH260
7 – 3
Check the TE waveform at pin 31 on IC3.
(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 32, 31 and 34 on IC3, pins
4, 5, 10 and 11 on IC1, pins 17, 18, 35 and 36 on IC2 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 34 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pins 16~19 and 21
on IC3) system.
Figure 4
IC3
31
IC3
33
4
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 ?
(Waveform drawing Figure 5)
Yes
The spin driver circuit is OK.
No
2. The turntable doesn't rotate.
Check around pin 41 on IC3, pins 3, 4, 13 and 14 on IC2.
Figure 5
IC3
33
IC3
41
6
1