Sharp MD-X60H Service Manual page 26

MD-X60H
7. INNER mode
Setting Method
Step No.
Step 1 Testmode STOP state
Step 2 Press the TRACK EDIT button.
Step 3 Press once the MD PLAY button. INNER switch position measurement
Step 4 Press once the MD STOP button. INNER menu
• : Adress
Lead-in switch position measurement mode
Insert High reflection test disk (TGYS1)
Note: Adjust the lead-in switch position to FF85 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.
Adjustment of magnetic head mounting position
When the magnetic head and optical pickup have been replaced, be
sure to adjust the mounting position.
For easier adjustment of mounting position move the optical pickup
to the center position, and then adjust the position.
1. Set the adjusting transparent disc 3.
2. Lower the magnetic head up-shift arm with your finger, and raise
the magnetic head.
3. Viewing the set from above, make an adjustment so that the
magnetic head aligns with the optical pickup objective lens.
4. Make sure that there is a clearance as shown in Figure 26-2 and
the magnetic head moves up and down smoothly.
Mechanism Adjustment
1. Optical pickup grating inspecting method
43 Pin of IC1101
GND (TP1131)
100K
26 Pin of IC1101
EOUT (TP1133)
470p
470p
25 Pin of IC1101
FOUT (TP1132) 100K
Figure 26-3 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 .
INNER menu
(SUBQ address and C1 error are also indicated.)
a
OSILLOSCOPE
GND CH1 CH2
b
X Y
LISSAJOUS'S WAVEFORM
Less than a:b = 4:1
Remarks
Loosen the
two screws (A).
Mechanism Switch PWB
Magnetic head
Objective lens
Circumferential direction
Spindle Motor
Adjusting hole
3
Spindle motor
1
adjusting
hole
2
– 26 –
Display
[ t s m
[ _ _ I N N E R _ _ ]
[s c
[ _ _ I N N E R _ _ ]
Lead In Switch
Figure 26-1
Radial direction
Push
Optical Head
Figure 26-2
1
3
2
Check the Lissajou's waveform,
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).
Figure 26-4
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