Read Sharp XL-HF401PH (serv.man5) Service Manual online
XL-HF401PH
4 – 3
The tracking servo is not activated.
Check the peripheral circuits at pins 98, 99, 101, 102 on IC1 and
FFC1.
Check the peripheral circuits at pins 98, 99, 101, 102 on IC1 and
FFC1.
(2) Focus-RF system check.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears ?
DISC appears ?
Check the TE waveform at pin 16 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 101 on IC1.
the track cannot be found.
Check the around pin 101 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 125 ~ 128 on IC1.
Data cannot be read. Check the VCO - PLL (Pin no. 125 ~128
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 98 on IC1, pins 1 and 2 on CNP2.
No
Figure 5
Figure 4
63
118
IC1
IC1
4
TE
RFOUT
7
102
98
IC1
IC1
1
FDO
SPDO
3
Figure 6
126
127
IC1
IC1
5
PLLF
PLLFO
6
102
IC1
FDO
1
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