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26

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.

Chuck the disc (YEDS-18) beforehand.

2.

Connect oscilloscope to test point TP (FE1) on BD board.

3.

With the power ON, while pressing the TIME and MEGA
CONTROL  buttons, press the  

1/u  button.

Rotate the  DISC/ALBUM/CHARACTER  dial, select “BU
Test” and press the dial.

4.

Rotate the  DISC/ALBUM/CHARACTER  dial, and select “bdt
S CURVE”. Press the dial “LD AL” is displayed.

5.

Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3±1
Vp-p.

S-curve waveform

6.

Pressing the MENE/NO  button stops the output of the
waveform (S CURVE). “bdt S CURVE”is displayed.

7.

To end this mode, press the  ?/1  button.

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

brightness to obtain best waveform.

Adjustment Location: BD board (See page 28)

oscilloscope

BD board

TP (FE1)
TP (DVC)

symmetry

A

B

Within 3 

±

 1 Vp-p

VOLT/DIV : 1V
TIME/DIV : 400 

µ

s

oscilloscope

BD board

TP (RFAC)
TP (DVC)

VOLT/DIV : 500mV
TIME/DIV : 1 

µ

s

level : 1.2         Vp-p

+0.25
–0.20

Procedure :
1.

Connect oscilloscope to test point TP (RFAC) 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.

RF signal waveform

Adjustment Location: BD board (See page 28)

27

1.

Connect the oscilloscope to Pins 1, 2, and 3 of TP1 of the
MAIN board.

2.

Check that no discs are loaded in the unit.

3.

With the power ON, while pressing the  TIME  and MEGA
CONTROL buttons, press the  

1/u    button. Rotate the  DISC/

ALBUM/CHARACTER  dial, select “CDM Test” and press the
dial.
Rotate the  DISC/ALBUM/CHARACTER  dial and select
“TableRotation” and press the dial.
The disc table starts to rotate in the clockwise direction.

4.

Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the H-H waveform comes the center of the H portion
of the D.SENS waveform.

Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.

5.

Rotate the  DISC/ALBUM/CHARACTER  knob in the
counterclockwise direction and the disc table starts to rotate in
the same direction. Check that the waveform at this time is the
same as that in step 4. If larger by a considerable extent, rotate
the  DISC/ALBUM/CHARACTER  knob in the clockwise
direction and the disc table starts to rotate in the same direction.
Repeat from step 4.

6.

Rotate RV501 of the MAIN board and adjust so that the H and
L portions of the D.S waveform become the same.

S tight,  screw 
(PTTWH 3 

×

 6)

D. sens (out) board

D.SENS

H-H

CH1

CH2

D.SENS

H-H

CH1

CH2

Should be at the center

D.SENS

CH1

Adjust so that these widths
become the same.

D.SENS OUT: Pin 

1

GND: Pin 

2

H-H OUT: Pin 

3

oscilloscope

CH1 CH2

D.SENS OUT
GND
H-H OUT

MAIN board

TP1

Adjustment Location: MAIN board (See page 28)

• This mode is used for the measurement of the table sensor signal

outputs characteristics.

Procedure :
1.

Check that no discs are loaded in the unit.
With the power ON, while pressing the  TOP ARTIAT 8  and
H  buttons, press the  +100  button.
“Spray Mode” is displayed.

2.

Press the H button to start the measurement. “Now ···ing” is
displayed during the measurement of one rotarion.

3.

The result of the measurement is displayed as below.

4.

To end this mode, press the  

1/u  button.

P = 3 .6 V   b = 1 .4 V

Minimum value
of the peak at the 
High/High part of 
TSENS1/TSENS2

Maximum value
of the bottom at the
LOW/LOW part of 
TSENS1/TSENS2

display

28

[ BD BOARD ] – Conductor Side –

[ MAIN BOARD ] – Component Side –

TP(FE1)

TP(DVC)

TP(RF AC)

IC 103

IC 101

TP1

TP(AFADJ)

GND

TP(ADJ)

1

3

RV501
DISC SENSOR
ADJUSTMENT

IC501

IC504

– Conductor Side –

29

29

Note:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

¢

: internal component.

•

C

: panel designation.

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
no mark : STOP

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

J

: CD

c

: digital out

• Abbreviation

CND : Canadian model

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

•

®

: Through hole.

•

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Note:
The components identi-
fied by mark 

!

 or dotted

line with mark 

!

 are criti-

cal for safety.
Replace only with part
number specified.

Note:
Les composants identifiés par
une marque 

!

 sont critiques

pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.

Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)

pattern face are indicated.

Parts face side:

Parts on the parts face side seen from the

(Side A)

parts face are indicated.

C

These are omitted

E

B

Q

C

These are omitted

E

B

LED board

MAIN board

TRANS board

D. MOTOR board

JOG board

BD board

DOOR SW board

T. SENS board 

KEYBOARD board

D. SENS 
(OUT) board

DISP board

D. SENS (IN) board

LOADING SW board

L. T. MOTOR board

LOCK SW board