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– 33 –

11. Rotate the  AMS  dial until the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

12. Press the  ENTER/YES  button, and save the adjustment results

in the non-volatile memory. (“EFB = 

 SAVE” will be dis-

played for a moment.)
Next “EF MO ADJUST” is displayed. The disc stops rotating
automatically.

13. Press the  

§EJECT (MD)  button and remove the disc.

14. Load the check disc (MD) TDYS-1.
15. Roteto  AMS  dial and display “EF CD ADJUST”.
16. Press the  ENTER/YES  button and display “EFB = 

 CD”.

Servo is imposed automatically.

17. Rotate the  AMS  dial so that the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

18. Press the  ENTER/YES  button, display “EFB = 

 SAVE” for

a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” will be displayed.

19. Press the  

§EJECT (MD)  button and remove the check disc

(MD) TDYS-1.

Note 1 : MO reading data will be erased during if a recorded disc is

used in this adjustment.

Note 2 : If the traverse waveform is not clear, connect the oscillo-

scope as shown in the following figure so that it can be
seen more clearly.

Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTERYES  button and display “CPLAY MID”.
4. Press the  MENU/NO  button when “C1 = 

 AD = 

” is

displayed.

5. Rotate the  AMS  dial and display “FBIAS ADJUS”.
6. Press the  ENTER/YES  button and display “ 

/

 a = 

”.

The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.

7. Rotate the  AMS  dial in the clockwise direction and find the

focus bias value at which the C1 error rate becomes about 200
(Refer to Note 2).

8. Press the  ENTER/YES  button and display “ 

/

 b = 

”.

9. Rotate the  AMS  dial in the counterclockwise direction and find

the focus bias value at which the C1 error rate becomes about
200.

10. Press the  ENTER/YES  button and display “ 

/

 c = 

”.

11. Check that the C1 error rate is below 50 and ADER is 00. Then

press the  ENTER/YES  button.

12. If the “(

)” in “

 - 

 - 

 (

)” is above 20, press the  EN-

TER/YES  button.
If below 20, press the  MENU/NO  button and repeat the ad-
justment from step 2.

13. Press the  

§EJECT (MD)   button to remove the test disc.

Note 1 : The relation between the C1 error and focus bias is as

shown in the following figure. Find points a and b in the
following figure using the above adjustment. The focal
point position C is automatically calculated from points a
and b.

Note 2 : As the C1 error rate changes, perform the adjustment us-

ing the average vale.

VC

A

B

Specification A = B

VC

A

B

Specification A = B

330 k

Ω

Oscilloscope

10pF

BD board

CN110 pin 

3

 (TE)

CN110 pin 

1

 (VC)

C1 error

about 
200

b

c

a

Focus bias value
(F. BIAS)

– 34 –

Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button twice and display “CPLAY MID”.
4. The display changes to “C1 = 

 AD = 

”.

5. Check that the C1 error rate is below 20.
6. Press the  MENU/NO  button, stop playback, press the   

§EJECT

(MD)  button, and remove the test disc.

Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button and display “CPLAY MID”.
4. The display changes to “C1 = 

 AD = 

”.

5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the  MENU/NO  button, stop playback, press the  

§EJECT

(MD)  button, and remove the test disc.

Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button twice and display “CPLAY MID”.
4. Press the  MENU/NO  button when “C1 = 

 AD = 

” is

displayed.

5. Rotate the  AMS  dial and display “FBIAS CHECK”.
6. Press the  ENTER/YES  button and display “ 

/

 c = 

”.

The first four digits indicate the C1 error rate, the two digits
after “/” indicate ADER, and the 2 digits after “c =” indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is below 2.

7. Press the  ENTER/YES  button and display “ 

/

 b = 

”.

Check that the C1 error is below 220 and ADER is below 2.

8. Press the  ENTER/YES  button and display “ 

/

 a = 

”.

Check that the C1 error is below 220 and ADER is below 2.

9. Press the  MENU/NO  button, next press the  

§EJECT (MD)

button, and remove the continuously recorded disc.

Note 1 : If the C1 error and ADER are above other than the speci-

fied value at points a (step 8. in the above) or b (step 7. in
the above), the focus bias adjustment may not have been
carried out properly. Adjust perform the beginning again.

Be sure to perform this adjustment when the pickup is replaced.
If the adjustment results becomes “Adjust NG!”, the pickup may be
faulty or the servo system circuits may be abnormal.

Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Rotate the  AMS  dial to display “AG Set (CD)”.
3. When the  ENTER/YES  button is pressed, the adjustment will

be performed automatically.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)”.

4. Press the  

§EJECT (MD)  button to remove the disc.

Adjusting Procedure :
1. Insert the reference disc (MDW-74/AU-1) for recording.
2. Rotate the  AMS  dial to display “AG Set (MO)”.
3. When the  ENTER/YES  button is pressed, the adjustment will

be performed automatically.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)”.

4. Press the  

§EJECT (MD)  button to remove the disc.

– 35 –

NOTE:It is useful to use the jig. for checking the waveform. (Refer

to Servicing Note on page 9.)

CN110

NOTE

D101

I+3V
IOP

TE

VC

GND

IC171

IC121

IC101

IC192

CN101

RF

– 36 –

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

Adjustment Location: Playback Head (Deck A)

Record/Playback/Erase Head (Deck B)

3. Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase

45

°

90

°

135

°

180

°

good

wrong

VIDEO (AUDIO) OUT

Reverse

Foward

Note: Perform this adjustments for both decks.

Procedure:
1. Mode : Playback

Signal

Used for

Tape

1. Demagnetize the record/playback head with a head damagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjusted.

4. The adjustments should be performed with the rated power sup-

ply 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 adjust-
ment.)

6. The adjustments should be performed for both L-CH and R-CH.
7. Switches and controls should be set as follows unless otherwise

specified.

P-4-A100

WS-48B

P-4-L300

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

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 1 dB of peak.

test tape
P-4-A100
(10kHz, –10dB)

VIDEO (AUDIO) OUT level meter

set

+

–

L-CH
peak

R-CH
peak

screw
position

output
level

within
1 dB

L-CH
peak

R-CH
peak

screw
position

within 1dB