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10

Focus bias 8-step up (hexadecimal)

Middle of focus bias up/down turning point

Focus bias optimum point, jitter value

Tracking servo, sled servo off

Tracking gain up

Focus bias 8-step down (hexadecimal)

Immediate readjustment of focus bias

Focus bias 00 point

Tracking servo, sled servo on

Tracking gain down

1

2

3

4

5

6

7

8

9

10

The following operations are performed in the ADJ mode, which is
set by connecting the TP21 (ADJ) terminal to the Ground and turning
on the power.

• During playback, there is no problem even if the GFS is continu-

ously LOW.

• High speed search is prohibited during access.
• During playback, the gain of focus servo and spindle servo does

not decrease.

• Servo related manual operations and measurement can be per-

formed.
(For details of operations, refer to Table of Key Operations in
ADJ Mode.)

The spindle servo for playback sets into the CLV-S mode when the
TP21 (ADJ) terminal is connected to Ground after turning on the
power.

The jitter value display mode can be set after the all-music remaining
number mode using the  TIME/TEXT  button.

The functions of the number buttons are shown in the following
table.

R350

CN305

CN304

TP21
(ADJ)

TP51
(AF ADJ)

 

[MAIN BOARD] — (Component Side) —

This unit is equipped with an aging mode to check operations of the
mechanism deck.
• When faults occur:
Aging stops, and the state when aging stopped is displayed on the
fluorescent display tube.

• When no fault has occurred:
Aging is continued repeatedly.

Aging method 1
(When using the aging mode remote controller (J-2501-123-A)):
1. Press the  U  button and turn ON the power.
2. Set the disc on the tray.
3. Press the  AGING START  button of the aging remote

controller.

4. Aging starts and the message shown in Fig. 1 is displayed on

the fluoresent display tube.

5. To end, press the  U  button.

Aging method 2 (When no aging mode remote controller):
1. Press the  U  button and turn ON the power.
2. Set the disc on the tray.
3. Press the  

§ OPEN/CLOSE  button,  p  button, and

MUSIC SCAN  button at the same time. (If these buttons are
not pressed at the same time, nothing performs.)

4. Aging starts and the message shown in Fig. 1 is displayed on

the fluoresent display tube.

5. To end, press the  U  button.

Display when

normal

State

0

1

2

3

4

5

6

Load in

Access to TOC

Access to last track

Playback of last track

(3 seconds)

Access to first track

Playback of first track

(3 seconds)

Load out

Code

No.

Display when

abnormal

AGING-0

AGING-1

AGING-2

Counter

display

AGING-4

Counter

display

AGING-6

ERROR-0

ERROR-1

ERROR-2

ERROR-3

ERROR-4

ERROR-5

ERROR-6

Fig.1 Message in Aging Mode

11

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) on SERVO board.

2.

Connect between test point TP (FEI) and TP (VC) by lead wire.

3.

Turn  U  (power) switch on.

4.

Put disc (YEDS-18) in and turn  U  (power) switch on again
and actuate the focus search. (actuate the focus search when
disc table is moving in and out.)

5.

Check the oscilloscope waveform (S-curve) is symmetrical
between 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

brightness to obtain best waveform.

Procedure :
1.

Connect oscilloscope to test point TP (RF) on SERVO board.

2.

Turn  U  (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 oscilloscope to test point TP (TE) on SERVO board.

2.

Turn  U  (power) switch on.

3.

Put disc (YEDS-18) in to play the number five track.

4.

Press the “P (Pause)” button. (Becomes the 1 track jump mode)

5.

Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Procedure :
1.

Connect oscilloscope to test point TP (TE) on SERVO board.

2.

Connect the test point TP21 (ADJ) on MAIN board to the
ground with a lead wire.

3.

Turn the  U  (power) switch on to set the ADJ mode.

4.

Put disc (YEDS-18) in to play the number five track.

5.

Press the “4” button. (The tracking servo and the sledding servo
are turned OFF.)

S-curve waveform

symmetry

A

B

within 3 

±

1Vp-p

0V

level : 1.3 

±

0.6 Vp-p

symmetry

A (DC voltage)

B

Center of the waveform

1track jump waveform

SERVO board

oscilloscope

TP(TE)
TP(VC)

SERVO board

oscilloscope

TP(FE)
TP(VC)

SERVO board

oscilloscope

TP(RF)
TP(VC)

SERVO board

oscilloscope

TP(TE)
TP(VC)

RF signal waveform

VOLT/DIV : 200mV
TIME/DIV : 500ns 

level : 1.45 

±

0.25     

 Vp-p

12

8.

Disconnect the lead wire of TP21 (ADJ) connected in step 2.

[MAIN BOARD] — (Component Side) —

2.

Connect the TP21(ADJ) terminal to the Ground and Turn  U
(power) switch on. (ADJ mode)

3.

Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MH
±30kHz.

4.

Disconnect the lead wire of TP1. (ADJ)

6.

Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Procedure :
1.

Connect frequency counter to test point TP (MNT1) with lead
wire.

7.

Press the “9” 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.

0V

Tracking servo
Sledding servo
         OFF

Tracking servo
Sledding servo
         ON

C (DC 
voltage)

Traverse waveform

0V

B

Center of the waveform

A (DC voltage)

level : 1.3 

±

 0.6 Vp-p

Traverse waveform

R350

CN305

CN304

TP21
(ADJ)

TP51
(AF ADJ)

 

SERVO board

TP (MNT1)

frequency counter

 

— Side A —

IC101

TP (RF)

TP (FE)

TP (MNT1)

TP (VC)

TP (TE)

TP (FEI)

IC103

13

13

POWER SW board

KEY board

HP board

ROTARY SW board

DISP board

SERVO board

POWER board

TRANS board

SLED board

SPINDLE board

LD IN SW board

MAIN board

LOADING
   board

4.0Vp-p

8MHz

1

  TP1 (RF)

1.2Vp-p

(PLAY)

5

  IC801

#ª

 (EXTAL)

3

  IC301

%¢

 (128FSO)

2

  CN304 

!¡

4.0Vp-p

3.0Vp-p

5.6448MHz
   (128Fs)

16.9344MHz

4.8Vp-p

45MHz

4

  IC301

@•

 (XOUT) 

• 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.

•

%

: indicates tolerance.

•

¢

: internal component.

•

2

: nonflammable resistor.

•

1

: fusible resistor.

•

C

: panel designation.

•

U

: B+ Line.

•

V

: B– Line.

•

H

: adjustment for repair.

• 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.
• Circled numbers refer to waveforms.
• Signal path.

J

: CD

c

: DIGITAL OUT

• X

: parts extracted from the component side.

•

®

: Through hole.

•

¢

: internal component.

• b

: Pattern from the side which enables seeing.

Note: The components identified by mark 

!

 or dotted line

with mark 

!

 are critical for safety.

Replace only with part number specified.