Sharp GX-M10 (OR), Руководство по обслуживанию

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GX-M10
5 – 3
The tracking servo is not activated.
Check the peripheral circuits at pins 50, 51, 48, 49 on IC1 and
FFC1.
(2) Trackin g s y s tem check.
If the waveform shown in Figure 4 appears and soon after NO
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.
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.
(3) Spin s y s tem check.
(4) PLL s y s tem 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
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
Fi g ure 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
Fi g ure 5
Fi g ure 6