SD-NX10 (serv.man5). Part 2 - text (Page 14-34) - Sharp Audio Service Manual (repair manual). Page 17

– 30 –

1

1

1

1

1

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

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

A

B

(A1) X1

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.

• 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)

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. 30-4)

OSILLOSCOPE

GND CH1

CH2

X

Y

4 Pin of IC1201
GND (TP1202)

11 Pin of IC1201
EIN (TP1253)

12 Pin of IC1201
FIN (TP1254)

100K

470p

470p

a

b

LISSAJOUS'S WAVEFORM

Less than a:b = 4:1

100K

2

3

1

2

3

1

adjusting
hple

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

Objective

Lens

Radiai

Tangential

direction

Magnetic Head

Head up-
shift ar