MDS-DRE1 - Sony Audio Service Manual (repair manual). Page 17

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11. Rotate the 

[AMS]

 knob until the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

12. Press the 

[ENTER/YES]

 button, display “EFB = $   SAV” for

a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.

13. Press the 

[   EJECT]

 button and remove the MO disc.

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

[ENTER/YES]

 button and display “EFB = $   CD”.

Servo is imposed automatically.

16. Rotate the 

[AMS]

 knob so that the waveform of the oscillo-

scope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

17. Press the 

[ENTER/YES]

 button, display “EFB = $   SAV” for

a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL ADJUS” is displayed.

18. Press the 

[   EJECT]

 button and remove the test disc TDYS-1.

Data will be erased during MO reading if a recorded disc is used
in this adjustment.

If the traverse waveform is not clear, connect the oscilloscope as
shown in the following figure so that it can be seen more clearly.

Adjusting method:
1. Connect an oscilloscope to TP75 (TEO) and TP31 (VC) of the

BD board.

2. Load a MO disc (any available on the market). (Refer to Note

1)

3. Press the 

[      ]

 button or 

[      ]

 button and move the optical

pick-up outside the pit.

4. Rotate the 

[AMS]

 knob and display “EFBAL ADJUS”.

5. Press the 

[ENTER/YES]

 button and display “EFBAL MO-W”.

(Laser power WRITE power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)

6. Adjust RV101 of the BD board so that the waveform of the

oscilloscope becomes the specified value.
(MO groove write power traverse adjustment)

(Traverse Waveform)

7. Press the 

[ENTER/YES]

 button and display “EFB = $   MO-

R”.
(Laser power: MO reading)

8. Rotate the 

[AMS]

 knob so that the waveform of the oscillo-

scope becomes the specified value.
(When the 

[AMS]

 knob is rotated, the   of “EFB = $  ” changes

and the waveform changes.) In this adjustment, waveform var-
ies at intervals of approx. 3%.  Adjust the waveform so that
the specified value is satisfied as much as possible.
(MO groove read power traverse adjustment)

(Traverse Waveform)

9. Press the 

[ENTER/YES]

 button, display “EFB = $   SAV” for

a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL MO-P” is displayed.

10. Press the 

[ENTER/YES]

 button and display “EFB = $   MO-

P”.
The optical pick-up moves to the pit area automatically and
servo is imposed.

Oscilloscope

BD board

TP75 (TEO)

TP31 (VC)

VC

A

B

Specification A = B

VC

A

B

Specification A = B

VC

A

B

Specification A = B

VC

A

B

Specification A = B

0

)

§

§

Oscilloscope

330 k

Ω

10 pF

BD board

TP75 (TEO)

TP31 (VC)