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16

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. After the adjustments, apply suitable locking compound to the

pats adjusted.

Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the

 CD SYNC/HI-DUB 

 button.

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 ?/1 button.

Mode:  Playback

1. Insert the WS-48B into the deck B.
2. Press the gG button on the deck B.
3. Press the  CD SYNC/HI-DUB  button in playback mode.

Then at HIGH speed mode.

4. Adjust RV1001 on the LEAF SW board so that frequency

counter reads 6,000 

± 30 Hz.

5. Press the  CD SYNC/HI-DUB  button.

Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency

counter reads 3,000 

± 15 Hz.

Adjustment Location:  LEAF SW board

Procedure:
Mode:  Playback

1. Confirm that level difference between the channels is with 

±

0.5 dB.

2. After check, adjust the following RVs.

Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.

CN301 PB level:  334.4 to 748.7 mV (–7.3 to  –0.3 dB)

Adjustment Location:  MAIN board

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

(WS-48B)

1

°

°

°

°

2

3

3

1

3

1

forward

reverse

17

4. Mode:  Record

5. Mode:  Playback

6. Confirm the play back signal recorded in step 3 becomes

adjustable level as follows.
If these levels are not adjustable level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 4
and 5.

Adjustable level:
CN301 PB level:  47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location:  MAIN board

[MAIN  BOARD] (Component Side)

[LEAF  SW  BOARD]  (Component Side)

Procedure:
In the MC test mode, the “REC memory mode” is convenient for
this adjustment. In the “REC memory mode” , when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.

1. Press  MD (VIDEO)  button to select VIDEO. (This step is not

necessary if the above test mode has already been set.)

2. Insert a tape into deck B.
3. After press  REC PAUSE/START  button, press REC PAUSE/

START button, then recording start.

4. Mode:  Record

5. Mode:  Playback

6. Confirm the playback signal recorded in step 3 becomes

adjustable level as follows.
If these levels are not adjustable level, adjust the RV304 (L-
CH) and RV354 (R-CH) on the MAIN  board to repeat steps 4
and 5.

Adjustable level: Playback output of 315 Hz to playback output

 of 10 kHz:  

±1.0 dB

Adjustment Location:  MAIN board

Procedure:
In the MC test mode, the “REC memory mode” is convenient for
this adjustment. In the “REC memory mode” , when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.

1. Press  MD (VIDEO)  button to select VIDEO. (This step is not

necessary if the above test mode has already been set.)

2. Insert a tape into deck B.
3. After press  REC PAUSE/START  button, press REC PAUSE/

START button, then recording start.







Ω

3

1

Ω





















T11

RV11

RV351

RV354

RV304

RV303

RV302

RV301

CN301

CN304

CN302

CN303

1

3

3

1

18

Procedure:
1.

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

2.

Tune the set to 98 MHz.

3.

Adjust RV11 to the point (moment) when the TUNED indicator
will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

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

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 22 and pin 3 of IC11.  Adjust
T11 until the voltage becomes 0 V.

Adjustment Location: MAIN board

 (Component Side)

Ω

Ω

Ω

Ω

T11

RV11

RV351

RV354

RV304

RV303

RV302

RV301

CN301

CN304

CN302

CN303

1

3

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. Turn Power switch on.
4. Load a disc (YEDS-18) and actuate the focus search. (In

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

5. 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.

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 (RFAC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

5. Measure the RFDC in the same way.

±

19

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 (DVC) board.

2.

Turned Power switch on.

3.

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

4.

Press the  u  button. (Becomes the 1track 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.

A
B

[ BD (CD) BOARD ] — SIDE B —

IC103

IC101

TP
(RFDC)

TP 
(CE)

TP
(RFAC)

TP
(XPCK)

±

±