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– 17 –

1. CD Block is basically designed to operate without adjustment. There-

fore, 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.

11. Turn OFF the power, and remove the lead wire connected at

step 7.

A clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

Procedure :
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the 

[PLUS ONE]

 button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (FE) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. The first track will be played back automatically. When the

[CHECK]

 button is pressed, “S-JI mode” will be displayed on

the fluorescent indicator tube, and focus search will be repeated.

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

tween A and B. And confirm peak to peak level within 1.8 ±
0.6 Vp-p.

11. Turn OFF the power, and remove the lead wire connected at

step 7.

• 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 brightness

to obtain best waveform.

Procedure :
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the [PLUS ONE] button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (RF) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. Playback the fifth track of the disc.
10. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

The procedure for this checking method differs for when a gen-
eral remote control unit is used and not used.

When a general remote commander is used:
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the 

[PLUS ONE]

 button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (TE) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. Playback the fifth track of the disc.
10. Press the 

[3]

 button on the remote commander. (The tracking

servo and the sledding servo are turned OFF.)

11. 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 ± 10%

BD board

TP (FE)

TP (VC)

+
–

oscilloscope

symmetry

S-curve waveform

within 1.8 

±

 0.6 Vp-p

A

B

BD board

TP (RF)

TP (VC)

+
–

oscilloscope

(AC range)

level: 1.8      Vp-p

+0.3
–0.2

VOLT/DIV : 200 mV
TIME/DIV : 500 ns

RF signal waveform

BD board

TP (TE)

TP (VC)

+
–

oscilloscope

Center of the 
waveform

Traverse waveform

B

A (DC voltage)

0 V

level: 0.9 

±

 0.45 Vp-p

Traverse waveform

C (DC 
voltage)

0 V

Tracking servo
Sled servo
         OFF

Tracking servo
Sled servo
           ON

12. Press the 

[8]

 button on the remote control unit. (The tracking

servo and sledding servo are turned ON.) Confirm the C (DC
voltage) is almost equal to the A (DC voltage) is step 11.

13. Turn OFF the power, and remove the lead wire connected at

step 7.

– 18 –

Procedure :
1. Connect the frequency counter to TP (PCK) of the BD board.

2. Press the

I

/

u

button and turn ON the power supply.

3. Open the front cover, and press the 

[PLUS ONE]

 button.

4. Set the disc (YEDS-18) into the “PLUS ONE” slit.
5. Close the front cover, and chuck the disc.
6. Playback th e fifth track of the disc.
7. Confirm that reading on frequency counter is 4.3218 MHz ±

30 kHz.

RV601 of the MAIN board requires no adjustments. Please note
that it should be dixed to mechanical center position when you
moved and do not know origin position.

When a general remote commander is not used:
1. Solder lead wires to TP (DVDD) and TP (TOFF) on the BD

board severally.

2. Connect the oscilloscope to TP (TE) of the BD board.
3. Press the

I

/

u

button and turn ON the power supply.

4. Open the front cover, and press the 

[PLUS ONE]

 button.

5. Set the disc (YEDS-18) into the “PLUS ONE” slit.
6. Close the front cover, and chuck the disc.
7. Playback the fifth track of the disc.
8. Short-circuit the lead wire connected at step 1. (The tracking

servo is turned OFF)

9. 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 ± 10%

10. Disconnect the lead wire short-circuited at step 8. (The track-

ing servo is turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 8.

11. Turn OFF the power, and remove the lead wire connected at

step 1.

B

A (DC voltage)

level: 1.3 

±

 0.5 Vp-p

Center of the 
waveform

Traverse waveform

0 V

Traverse waveform

C (DC 
voltage)

0 V

Tracking servo

OFF

Tracking servo

ON

frequency counter

BD board

TP (PCK)

– 19 –

[ BD BOARD ] — CONDUCTOR SIDE —

[ MAIN BOARD ] — CONDUCTOR SIDE —

[ MAIN BOARD ] — COMPONENT SIDE —

IC102

IC101

CN102

CN103

CN101

TP

(TOFF)

TP

(RF)

TP

(VC)

TP

(TE)

TP

(FE)

TP

(DVDD)

TP

(PCK)

TP

(GND)

IC201

CN704

CN702

IC501

R504

R505

TP (ADJ)

IC201

IC601

CN702

CN704

CN603

RV601

NO802

– 20 –

TABLE SENSOR board

DISC SENSOR (R) board

DISC SENSOR (S) board

AUDIO board

BD board

SW board

MOTOR board

POWER SW board

LED board

MAIN board

DISPLAY board