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— 13 —

˜

Light alternately

˜

Light alternately

˜

Light alternately

— 14 —

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.

Note: Do not use the test disc when performing aging.

Aging will not be performed properly if discs with tracks
shorter than 4 seconds are used.

Aging method 1
(When using the aging mode remote controller (J-2501-123-A):
1. Set the COMMAND MODE switch to CD1.
2. Press the  

1/u  button and turn ON the power.

3. Set discs on all trays.

(More than two discs if five are not available.)

4. Press the AGING START button of the aging remote controller.
5. Aging starts and the message shown in Fig. 1 is displayed on the

fluorescent display tube.

6. To end, press the  

1/u  button.

Aging method 2
(When no aging mode remote controller):
1. Press the  

1/u  button and turn ON the power.

2. Set discs on all trays.

(More than two discs if five are not available.)

3. Press the  4 button, 0 button, and  DISC SKIP  button in this

order together.

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

fluorescent display tube.

5. To end, press the  

1/u  button.

The discs are selected in the order of DISC 1 n DISC 2 n DISC 3 n DISC 4 n DISC 5 n DISC 1 n .... Empty trays are skipped.

Code No.

State

1

2

3

4

5

6

7

8

9

A

0

TOC reading

Accessing last track

Playing back last track (3 seconds)

EX-CHANGE (Tray opened while chucking)

DISC SKIP (Disc tray rotated)

CLOSE (Tray closed)

Accessing first track

Playing back first track (3 seconds)

OPEN (Tray opened)

DISC SKIP (Disc tray rotated, and next disc was selected)

CLOSE (Tray closed)

Display when Normal

AGING 1

AGING 2

Counter display

AGING 4

AGING 5

AGING 6

AGING 7

Counter display

AGING 9

AGING A

AGING 0

Display when Abnormal

AGING NG1

AGING NG2

AGING NG3

AGING NG4

AGING NG5

AGING NG6

AGING NG7

AGING NG8

AGING NG9

AGING NGA

AGING NG0

— 15 —

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 board.
2. Connect between test point TP (FE1) and TP (VC) by lead wire.
3. Connect both ends of TP R151 of the BD board to the lead wire.
4. Turn ON the power.
5. Put disc (YEDS-18) in and actuate the focus search. (actuate the

focus search when disc table is moving in and out.)

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

between A and B. And confirm peak to peak level within 4.5 ± 1
Vp-p.

S-curve waveform

7. After check, remove the lead wire connected in step 2 and 3.

• 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 BD board.
2. Turn ON the power.
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.

A clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.

       RF signal waveform

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turn ON the power.
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 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%

     1 track jump waveform

Procedure :
1. Turn ON the power, put disc (YEDS-18), turn OFF the power.
2. Connect the test point TP2 (ADJ) on MAIN board to the ground

with a lead wire.

3. Connect oscilloscope to test point TP (TE) on BD board.
4. Turn the Power switch on to set the ADJ mode, automaticaly

play the number five track.

5. Press the 3 button. (The tracking servo and the sledding servo

are turned OFF.)

oscilloscope

BD board

TP (FE1)
TP (VC)

symmetry

A

B

Within 4.5 

±

 1 Vp-p

oscilloscope

BD board

TP (RF)
TP (VC)

oscilloscope

BD board

TP (TE)
TP (VC)

0V

level : 1.3         Vp-p

A (DC voltage)

Center of the waveform

B

symmetry

+ 0.7
– 0.6

oscilloscope

BD board

TP (TE)
TP (VC)

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

level : 1.2 

±

 0.2 Vp-p

— 16 —

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%

Traverse waveform

7.

Press the 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.

Traverse waveform

8.

Disconnect the lead wire of TP2 (ADJ) connected in step 2.

[BD BOARD] – SIDE A –

[MAIN BOARD] – CONDUCTOR SIDE –

0V

level : 1.3         mVp-p

A (DC voltage)

Center of the waveform

B

+ 0.7
– 0.6

0V

C (DC 
voltage)

Tracking servo
Sledding servo
        OFF

Tracking servo
Sledding servo
        ON

CN102

IC101

TP(FE2)

TP(VC)

TP(IOP)

TP(RF)

TP(TE)

TP(FE1)

IC501

R544

TP2

(ADJ)

TP1

(AFADJ)