Sharp MD-E9000H Service Manual page 30

MD-E9000H
1 1 1 1 1
Adjustment
Load a high-reflective TYGS1 test disc.
Note:
Adjust the position of the lead-in switch between FF85 to FFD2.
1. Loosen the screw (A1) x 1 pc., fixing the mechanism switch PWB.
2. Retighten the screw while pushing the PWB in the direction of arrow A if the switch position is at FF85 or lower, or in the direction
of arrow B if it is at FFD2 or higher, and measure its position again.
After adjusting the position, fix it with the screw (A1) x 1 pc. (See Fig. 30-1)
2 2 2 2 2
Confirmation
Check that the display shows "_COMPLETE_" instead of "#COMPLETE_" in step 4 of the AUTO adjustment mode.
Rotating the loading motor forcibly
The loading motor can be rotated forcibly by rotating the VOL
UP/DOWN button while STOP or EJECT in the test mode
appears on the display.
Magnetic head mounting position check
• Check the mounting position whenever the magnetic head
and the optical pickup are replaced.
• Move the optical pickup to the center to adjust the position
easily.
1. Set the transparent disc for checking the head.
2. Press down the magnetic head up shift arm by hand to raise
the magnetic head.
3. View the set from above to check whether the magnetic
head aligns with the optical pickup objective lens.
4. Check that the magnetic head moves up and down smoothly.
(See Fig. 30-2)
Mechanism Adjustment
1. Optical pickup grating inspecting method
4 Pin of IC1201
GND (TP1202)
100K
11 Pin of IC1201
EIN (TP1253)
470p
470p
12 Pin of IC1201
100K
FIN (TP1254)
Figure 30-3 Optical Pickup Grating Deviation
Measuring Method
After auto adjustment (COMPLETE appears) in the test mode
(auto) using the high reflection MD disc TGYS1, adjust the
Lissajou's waveform (x-y) of EOUT to FOUT.
1. Slightly loosen the 3 screws of the spindle motor, adjust
while observing the Lissajou's waveform.
2. After adjustment, tighten screws
order. (See Fig. 30-4)
OSILLOSCOPE
GND CH1 CH2
b
X Y
LISSAJOUS'S WAVEFORM
Less than a:b = 4:1
1 2 3
, , and in numerical
A
(A1) X1
Figure 30-1
Magnetic Head
Objective
Lens
a
2
3
– 30 –
B
Tangential
direction
Radiai
Head up-
shift ar
Figure 30-2
2
3
1
1
Check the Lissajou's waveform
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).
adjusting
hple
Figure 30-4