Read Sharp GX-M10H (serv.man3) Service Manual online
GX-M10H
5 – 3
The tracking servo is not activated.
Check the peripheral circuits at pins 50, 51, 48, 49 on IC1 and
FFC1.
Check the peripheral circuits at pins 50, 51, 48, 49 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 49 on IC1.
the track cannot be found.
Check the around pin 49 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 73 ~ 76 on IC1.
Data cannot be read. Check the VCO - PLL (Pin no. 73 ~ 76)
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 50 on IC1, pins 1 and 2 on CNP2.
No
Figure 4
138
67
IC1
IC1
4
TE
RFOUT
7
48
50
IC1
IC1
1
FOP
SPOUT
3
74
75
IC1
IC1
5
PLLF
PLLFO
6
48
IC1
FOP
1
Figure 5
Figure 6
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