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— 17 —

(1) Rotate the cam and adjust to the position

shown in the figure.

(2)Check that the state is as shown

in the figure.

Note:The disc should not be fixed.

(3)Remove the Magnet assembly.

Loosen the fixed screw by 60

°

 to 90

°

, and move and adjust the bracket (BU

adjustment) up and down using a tapering screwdriver so that the positions of
the disc hole and disc pulley become A=B or between A:B=2:1 and 1:2.

— 18 —

(1) Rotate the cam and adjust to the posi-

tion shown in the figure.

1234

1234

(2)Rotate the adjustment screw until A=B or between A:B=2:1

and 1:2

(3)Apply screw-lock to the        part after adjusting.

— 19 —

Note:
1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

Ω

 impedance.

4. Clean the object lens by an applicator with neutral detergent when

the signal level is low than specified value with the following
checks.

Procedure :
1. Connect oscilloscope to test point TP (FE 1) on BD board.
2. Connect test point TP301 (ADJ) on MAIN board to ground with

lead wire.

3. Turn Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in and playback.

Press the CHECK button.

5. Check the oscilloscope waveform (S-curve) is symmetrical be-

tween A and B. And confirm peak to peak level within 3

±

1 Vp-p.

6. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio of

A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the bright-

ness to obtain best waveform.

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

Note: A clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

±

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Connect the test point TP301 (ADJ) on MAIN board to the ground

with a lead wire.

3. Turn the Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the “BLOCK3” button. (The tracking servo and the sled-

ding servo are turned OFF.)

±

7. Press the “BLOCK 8” button. (The tracking servo and sledding

servo are turned ON.) Confirm the C (DC voltage) is almost equal
to the A (DC voltage) is step 6.

8. Disconnect the lead wire of TP301 (ADJ) connected in step 1.

6. Check the level B of the oscilliscope's waveform and the A (DC

voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than 

±

 22%

— 20 —

2. Turn Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.

Confirm that reading on frequency counter is 4.3218MHz.

RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point TP (PLCK) with lead wire.

— Component Side —

— Side B —