Sharp MD-X7H Service Manual page 62

MD-X8H
11. EJECT mode
Step No. Setting Method
Step 1 Testmode EJECT state
Step 2 Press oncethe CD STOP button. Max. power output state
Step 3 Press once the CD STOP button. Record power output state
Step 4 Press once the CD STOP button. Playback power output state
Step 5 Press the CD
Step 6 Press the TRACK EDIT button.
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.
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.
Mechanism Adjustment
1. Optical pickup grating inspecting method
42 pin of IC 1101
GND (TP1131)
100K
26 pin of IC 1101
EOUT (TP1133)
470p
470p
25 pin of IC 1101
FOUT (TP1132) 100K
Figure 26-2 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 spindle moto, and maken an
adjustment, observing the Lissajous's waveform.
2. After adjustment tighten the screw in arder of 1 , 2 , 3 .
2. Jitter adjustment and checking method
1pin of IC 1201 (TP1274)
EFMMON
88 pin of IC 1201 (TP1275)
GND
Figure 26-4 Jitter connection diagram
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.
MD EDIT button. TEMP setting of EEPROM setting
(Refer to TEMP setting of EEPROM)
CONTROL setting of EEPROM setting
(Refer to CONTROL setting of EEPROM)
OSILLOSCOPE
GND CH1 CH2
b
X Y
LISSAJOUS'S WAVEFORM
Less thana:b = 3:1
Jitter Meter
Remarks
Loosen the
two screws (A).
a
Spindle Motor
Adjusting hole
1
– 26 –
[ _ _ E J E C T _ _ _ ]
[ x p w _ _ _ _ _ _ _ ]
[ r p w _ _ _ _ _ _ _ ]
[ p p w _ _ _ _ _ _ _ ]
Lead In Switch
Mechanism Switch PWB
Figure 26-1
1
3
2
3
Spindle motor
Check the Lissajou's waveform,
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).
adjusting
hole
2
Figure 26-3
Display