Sharp MD-MS200W Service Manual page 12

MD-MS200W/MD-MS200/MD-MS200H
•When the STOP button is pressed while the TEST-PLAY menu appears, or in TEST-PLAY or continuous playback mode, the mode changes
to the TEST mode stop state.
• When the PLAY button is pressed while the TEST-PLAY menu appears,continuous playback is initiated from the current pickup position.
• Whenever the DISP button is pressed in the TEST-PLAY mode, the address changes as follows.
0050 — 03C0 — 0700 — 08A0 — 0050 —
• Whenever the BASS key is pressed in the TEST-PLAY mode, the digit which is changed by the SKIP UP/DOWN button changes as follows.
0050 — 0050 — 0050 — 0050 — 0050 —
• When the SKIP UP button is pressed in the TEST-PLAY mode, the digit of address specified by the BASS button is set to +1h. (0 to F)
• When the SKIP DOWN button is pressed in the TEST-PLAY mode, the digit of address specified by the BASS button is set to -1h. (0 to F)
* When the SKIP UP/DOWN button is held down, the setting changes continuously, one cycle being 100 ms.
• When the BASS button is pressed in the continuous playback mode, the number of jump lines changes as follows.
1 — 10 — 400 — 1
* After the number of jump lines is indicated for one second, the address indication is restored.
• When the SKIP UP button is pressed in the continuous playback mode, the specified number of lines is jumped in the FWD direction.
• When the SKIP DOWN button is pressed in the continuous playback mode, the specified number of lines is jumped in the REV direction.
* When the SKIP UP/DOWN button is held down, jump is repeated every approx. 100 ms.
•Whenever the DISP button is pressed in the continuous playback mode, the indication changes as follows.
* Pit section
Continuous playback (SUBQ address indication)
Continuous playback (C1 error indication)
Continuous playback (SUBQ address indication)
* Groove section
Continuous playback (ADIP address indication)
Continuous playback (C1 error indication)
Continuous playback (ADIP error indication)
Continuous playback (ADIP address indication)
• : Address
• : C1 Error rate
• : ADIP Error rate
• : JUMP lines
Mechanism Adjustment
1. Optical pickup grating inspecting method
TP141
GND
100Kohm
TP132
EOUT
470p
470p
TP133
FOUT 100Kohm
Figure 12-1 OPTICAL PICKUP GRATING DEVIATION
MEASURING METHOD
After the automatic adjustment is performed in the AUTO mode
(test mode) with the aid of high refection MD disc ("COMPLATE" is
displayed), the Lissajous's waveform (x-y) is adjusted.
1. Slightly loosen the 3 screws of spin motor, and make an
adjustment, observing the Lissajous's wavefor.
2. After adjustment tighten the screws in arder of<1> , <2> ,< 3> .
3. It confirms Lissajous's wavwform ripple mark once again.
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OSCILLOSCOPE
GND CH1 CH2
b
X Y
LISSAJOUS'S WAVEFORM
LESS THAN A:B = 3:1
[ S Q ]
[ C E ]
[ S Q ]
[ A P ]
[ C E ]
[ A E ]
[ A P ]
a
– 12 –
[ T R _ ]
2
1
Shifting the spin motor installation
position, check the Lissajous's
waveform.
Figure 12-2
3