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17

2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1)

The disc tray opens and closes.

(2)

The mechanism accesses DISC 2 and makes an attempt to
read TOC.  However, since there are no discs, a message
“CD2 NO DISC” appears.

(3)

The mechanism accesses DISC 3 and a message “CD3 NO
DISC” appears.

(4)

The disc tray turns to select a disc1.

(5)

A disc is chucked.

(6)

TOC of disc is read.

(7)

The pickup accesses to the track 1, and  playing 2 seconds.

(8)

The pickup accesses to the last track, and playing 2 seconds.

(9)

Every time when an aging operation of step 1 to step 8 is
complete, the display “AGING[*][*][*][*]” value increases
as the number of aging operations is counted up.

(10) Returns to step 1.

3. Aging Mode in Tape Deck section
1) Display state
• No error occurs

Display action now

• Error occurred

Display action last time

2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) Rewind is executed up to the top of tape A and B.
(2) A tape on FWD side is played for 2 minutes.
(3) FF is executed up to either made for 20 second or the end of

tape.

(4) A tape is reversed, and the tape on REV side is played for 2

minutes.

* REV side of both Tape A and Tape B are played.

(5) Rewind is executed up to the top of tape.
(6) Returns to step 2, and repeat steps from 2 to 5.

* elect either VIDEO or MD of the external FUNCTION input.

Procedure:
1.

Turn on the power.

2.

Press the two buttons

MD (VIDEO)

and

I/1

at the same time.

The main power is turned on and the other function of the
previous function is selected and displayed.  “MD” or
“VIDEO”.

NO. Display action

Action contents

Final timing

1

TAPE A AG-6

Rewind the TAPE A

The top of tape

TAPE B AG-1

Rewind the TAPE B

2

TAPE A AG-2

FWD play the TAPE A

2 minutes playing

3

TAPE A AG-3

F.F. the TAPE A

20 second FF or the end

of tape

4

TAPE A AG-4

REV play the TAPE A

2 minutes playing

5

TAPE A AG-5

Rewind the TAPE A

The top of tape

6

TAPE B AG-2

FWD play the TAPE B

2 minutes playing

7

TAPE B AG-3

F.F. the TAPE B

20 second FF or the end

of tape

8

TAPE B AG-4

REV play the TAPE B

2 minutes playing

9

TAPE B AG-5

Rewind the TAPE B

The top of tape

18

2. Turn the adjustment screw and check output peaks. If the peaks

do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

3. Mode:  Playback

4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the

parts adjusted.

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

set

test tape
P-4-A100
(10 kHz, –10 dB)

L-CH

R-CH

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

PANEL board
PHONES jack (JACK701)

oscilloscope

V

H

+ +

–

–

32 

Ω

32 

Ω

0 dB=0.775 V

1. Demagnetize the record/playback head with a head

demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjust.

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

service manual.  (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6. The adjustments should be performed for both L-CH and R-

CH.

• Test Tape

  Perform this adjustments for both decks

Procedure:
1. Mode:  Playback

set

test tape
P-4-A100
(10 kHz, –10 dB)

level meter

PANEL board
PHONES jack (JACK701)

32 

Ω

+
–

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

forward

reverse

19

Start the Tape Speed adjustment as below after setting to the test
mode.

Procedure:
1. Turn the power switch on.
2. Press the

x

button, 

ENTER

button and

DISC 3

button

simultaneously.
(The “TEST MODE” on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the

I/1

button.

Mode:  Playback

1. Insert the WS-48B into the deck A and the blank tape into the

deck B.

2. Press the

REC PAUSE/START

button on the deck B. Then the

deck B is at recording mode.

3. Set the deck A to playback mode.
4. Adjust SFR401 on the MAIN board so that frequency counter

reads 3,000 

±

 15 Hz.

5. Frequency difference between deck A and deck B the beginning

of the tape should be within 

±

1.5 %.

set

test tape
WS-48B 
(3 kHz, 0 dB)

frequency counter

PANEL board
PHONES jack (JACK701)

–

+

32 

Ω

Procedure:
1.

Supply a 28 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 60 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin wa of IC101.  Adjust T101 ubtil
the voltage becomes 0 V.

Adjustment Location: MAIN board

FM RF SSG

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 28 dB  (at 75 W open)

FM ANTENNA terminal
(JK101)

set

FM RF SSG

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 60 dB  (at 75 W open)

FM ANTENNA terminal
(JK101)

set

[MAIN BOARD] (Component side)

CN406

SFR401

TAPE SPEED

[MAIN BOARD] (Component side)

SRF101

FE101 or FE102

FM TUNED LEVEL

NULL

T101

IC101

Sample Value of Wow and Flutter: 0.3% or less W. RMS

(WS-48B)

20

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 TP (FEO).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search)

6. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 4 

±

1 Vp-p.

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

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 TP (RF).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

6. After check, remove the lead wire connected in step 2.

±

Clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

RF signal waveform

Procedure:
1.

Connect oscilloscope to TP (TEO) and TP (VC) board.

2.

Turned Power switch on.

3.

Load a disc (YEDS-18) and playback the number five track.

4.

Press the  gG  button. (Becomes the 1 track jump mode.)

5.

Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.

1 track jump waveform

Specification level:      

x

 100=less than 

±

22%

6.

After check, remove the lead wire connected in step 1.

Procedure :
1.

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

2.

Turned 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.

±

0V

Center of
waveform

B

Symmetry

A (DC voltage)

level=1.3

±

0.6Vp-p

A

B