Sharp MD-X7H, Руководство по обслуживанию

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MD-X8H
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11. EJECT mode
Step 1 Testmode EJECT state [ _ _ E J E C T _ _ _ ]
Step 2 Press oncethe CD STOP button. Max. power output state [ x p w _ _ _ _ _ _ _ ]
Step 3 Press once the CD STOP button. Record power output state [ r p w _ _ _ _ _ _ _ ]
Step 4 Press once the CD STOP button. Playback power output state [ p p w _ _ _ _ _ _ _ ]
Step 5 Press the CD MD EDIT button. TEMP setting of EEPROM setting
(Refer to TEMP setting of EEPROM)
Step 6 Press the TRACK EDIT button. CONTROL setting of EEPROM setting
(Refer to CONTROL setting of EEPROM)
Step No. Setting Method Remarks Display
Lead-in switch position measurement mode
Note: Adjust the lead-in switch position to 5FF85 to FFD2.
1. Loosen the screw (A) x 2 pcs. which fix the mechanism switch
PWB.
2. Retighten the screw, pressing the mechanism switch PWB in
the arrow direction, and then measure the lead-in switch
position again.
After position adjustment fix with the two screws (A). (See Fig. 26-1.)
Note: After tightening the two screws on the PWB apply Screw Lock.
Figure 26-1
Forced rotation of loading motor
While the display indication is test mode STOP state or EJECT state,
the loading motor can be forcibly rotated by press theVOL UP/DOWN
button.
Loosen the
two screws (A).
Lead In Switch
Mechanism Switch PWB
Figure 26-2 Optical Pickup Grating Deviation
Measuring Method
Mechanism Adjustment
1. Optical pickup grating inspecting 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 spindle moto, and maken an
adjustment, observing the Lissajous's waveform.
2. After adjustment tighten the screw in arder of 1 , 2 , 3 .
OSILLOSCOPE
GND CH1 CH2
X Y
42 pin of IC 1101
GND (TP1131)
26 pin of IC 1101
EOUT (TP1133)
25 pin of IC 1101
FOUT (TP1132)
100K
470p
470p
a
b
LISSAJOUS'S WAVEFORM
Less thana:b = 3:1
100K
Figure 26-3
1
2
3
1
2
3
adjusting
hole
Spindle motor
Check the Lissajou's waveform,
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).
Spindle Motor
Adjusting hole
2. Jitter adjustment and checking method
Figure 26-4 Jitter connection diagram
Jitter Meter
1pin of IC 1201 (TP1274)
EFMMON
88 pin of IC 1201 (TP1275)
GND
After performing automatic adjustment in AUTO mode of TEST mode
using the low reflection MD disc, check this jitter in pit continuous
playback and groove continuous playback mode.