Sharp XL-UH260 Service Manual - Page 87

Sharp XL-UH260 Manual

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(4) PLL system check. When a disc is loaded, start play operation. The RF waveform is normal, but the TOC data cannot be read. Check the IMAX waveform. (Figure 6) Check around Pins 16~19, and 21 on IC3. 7 IC3 17 8 IC3 19 6 IC3 41 1 IC3 33 Figure 6 XL-UH260 (5) Others. The RF waveform is normal and the time is displayed normally, but no sound is produced. Or the sound has dropouts. Is pin 11, 12 and 13 on IC5. (Figure 7) No There are too many error flags on a damaged disc which makes error correction impossible. Yes If OK, Check the unit. Check again using a known good disc. 9 IC5 13 10 IC5 12 11 IC5 11 Figure 7 7 - 4

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XL-UH260
7 – 4
The RF waveform is normal and the time is displayed nor-
mally, but no sound is produced. Or the sound has drop-
outs.
(4) PLL system check.
When a disc is loaded, start play operation.
The RF waveform is normal, but the TOC data cannot be read.
Check the IMAX waveform. (Figure 6)
Check around Pins 16~19, and 21 on IC3.
Figure 6
IC3
17
IC3
19
IC3
41
IC3
33
7
8
1
6
(5) Others.
Is pin 11, 12 and 13 on IC5. (Figure 7)
No
There are too many error flags on a damaged disc which makes
error correction impossible.
Yes
Check again using a known good disc.
If OK, Check the unit.
Figure 7
IC5
13
IC5
12
IC5
11
9
10
11