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— 25 —

(1) Rotate the cam and adjust to the position

shown in the figure.

(2)Check that the state is as shown

in the figure.

(3)Remove the Magnet assembly.

Note: The disc should not

be fixed.

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.

— 26 —

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

tion shown in the figure.

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

and 1:2

(3)Apply suitable locking compaund to the        part after adjusting.

1234

1234

— 27 —

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 (FE1) on BD (TEXT) board.
2. Connect test point TP (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 (TEXT) 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 (TEXT) board.
2. Connect the test point TP (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 “GROUP 3” button. (The tracking servo and the sled-

ding servo are turned OFF.)

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%

±

7. Press the “GROUP 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 TP (ADJ) connected in step 1.

— 28 —

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

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.

Procedure :
1. Connect the test points TP (TEST) and TP (GND) on MAIN board

with a lead wire. And Connect the frequency counter to the test
point TP (H SYNC).

2. Turn power switch on.
3. Adjust C506 so that the reading of frequency counter becomes

the adjustment value.

4. Disconnect the lead wire connected in step 1.

Adjustment value : NTSC : 3.579545 MHz 

±

 10Hz

PAL : 4.433618 MHz 

±

 10Hz

Procedure :
1. Press the POWER button while pressing the 

p (STOP) button.

The screen display is the screen for adjusting the width of the
OSD screen.
The position of the OSD screen set by the user will be cleared to
the center of the screen, which is the setting at shipment.

2. Adjust C510 so that the space on the right of the screen (width B)

is the same width as the orange frame on the right of the adjust-
ment screen (width A). (This adjustment takes into consideration
extra space for deviations caused by the monitors.)

3. Press the POWER button after completing the adjustment.

Adjust C510 so that width of the Orange frame (A) at the right of the
screen is the same as the width of space (B) of the monitor screen.

Disc Sensor Adjustment
Perform this adjustment after completing all adjustments of the mecha-
nism section.
If not performed accurately, the presence of the disc may not be de-
tected properly.

Connection 1:

Waveform 1:

CN305 of MAIN board
T1 : Pin 1 (T. SENS 1)
T2 : Pin 2 (T. SENS 2)
D0 : Pin 4 (D. SENS)

Ω

Connection 2:

CN305 of MAIN board
T1 : Pin 1 (T. SENS 1)
T2 : Pin 2 (T. SENS 2)
D1 : Pin 4 (D. SENS)