11.Rotate the lAMS L knob 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)

A

VC

B

Specification A = B

12.Press the YES button, and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

Next “EF MO ADJUS” is displayed. The disc stops rotating automatically.

13.Press the AEJECT button and remove the disc.

14.Load the check disc (MD) TDYS-1.

15.Roteto lAMS L knob and display “EF CD ADJUS”.

16. Press the YES button and display “EFB = CD”. Servo is imposed automatically.

17.Rotate the lAMS L knob 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)

A

VC

B

Specification A = B

18. Press the YES button, display “EFB = SAVE” for a mo- ment and save the adjustment results in the non-volatile memory. Next “EF CD ADJUST” will be displayed.

19.Press the A EJECT 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.

Oscilloscope

BD board

330 k

CN105 pin 4 (TE)

10pF

CN105 pin 6

(VC)

 

MDS-JE470

5-13. FOCUS BIAS ADJUSTMENT

Adjusting Procedure :

1.Load a test disk (MDW-74/GA-1).

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button and display “CPLAY1 MID”.

4. Press the

MENU/NO

button when “C =

AD = ” is

displayed.

 

5.Rotate the l AMS L knob and display “FBIAS AD- JUST”.

6.Press the YES button and display “ / a = ”.

The first four digits indicate the C error rate, the two digits after

[/]indicate ADER, and the 2 digits after [a =] indicate the focus bias value.

7.Rotate the lAMS L knob in the clockwise direction and find the focus bias value at which the C error rate becomes 220 (Refer to Note 2).

8.Press the YES button and display “ / b = ”.

9.Rotate the lAMS L knob in the counterclockwise di- rection and find the focus bias value at which the C error rate becomes 220.

10.Press the YES button and display “ / c = ”.

11.Check that the C error rate is below 20 and ADER is 00. Then press the YES button.

12.

If the “(

” in “ -

- ( ” is above 20, press the

YES

 

button.

 

 

 

 

 

 

 

If below 20, press the

 

MENU/NO

button and repeat the

 

adjustment from step 2.

 

 

 

 

13.

Press the

AEJECT

button to remove the test disc.

Note 1 : The relation between the C 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 C error rate changes, perform the adjustment using the average vale.

Cerror

220

b

c

a

Focus bias value

 

 

 

(F. BIAS)

33

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Sony MDS-S50 specifications Focus Bias Adjustment

MDS-S50 specifications

The Sony MDS-S50 is a pinnacle of MiniDisc technology, offering audiophiles a compact and reliable way to enjoy high-quality audio. Launched in the early 2000s, it epitomizes the innovation that Sony was known for during this period, combining functionality with sleek design.

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