SD-CX1 (serv.man5). Part 2 - text (Page 12-36) - Sharp Audio Service Manual (repair manual). Page 21

– 32 –

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.

• Be sure to check the fixing position of the magnetic head

when replacing the magnetic head and the optical pickup.

• Move the optical pickup to the center in order to make the

fixing position adjustment easy.

1. Secure the magnetic head to the optical pickup with

screw (B1) x 1 pc.

2. Set the transparent disc for checking the head.
3. Lower the magnetic head up shift arm manually to lower

the magnetic head.

4. Check whether the magnetic head aligns with the optical

pickup objective, seeing the set from above.

5. Check that the magnetic head goes up and down

smoothly. (See Fig. 32-2.)

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 1, 2, and 3 in numerical

order.  (See Fig. 32-4)

It is lowered
by hand.

(B1)x1
ø1.7x 5mm

Magnetic head up shift arm

Down

Magnetic head

Objective

lens

Radiai

Tangential

direction

Optical Pickup

GND CH1

CH2

X

Y

100K

470p

470p

a

b

100K

Osilloscope

Lissajous's waveform

4 Pin of IC1201

GND (TP1202)

11 Pin of IC1201

EIN (TP1253)

12 Pin of IC1201

FIN (TP1254)

Less then a:b = 4:1

2

3

1

2

3

1

adjusting
hole

Check the Lissajou's waveform, 
shifting the mounting position with
a screwdriver (to be fitted into the 
spindle motor adjusting hole).

Spindle Motor

Spindle Motor

Check that the display shows "_COMPLETE_" instead of
"#COMPLETE_" in step 4 of the AUTO adjustment mode.

(A1) X1

A

B

MD Mechanism
Switch PWB

Lead In Switch

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. 32-1)