MDS-B6P - Sony Audio Service Manual (repair manual). Page 12

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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)

Oscilloscope

BD board
TP (TEO)
TP (VC)

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

board.

2. Load a MO disc (any available on the market).
3. Press the 

0 button or ) button and move the optical pick-up

outside the pit.

4. Rotate the AMS knob and display “EFBAL ADJUST”.
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 oscil-

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

(Traverse Waveform)

VC

A

B

VC

A

B

Specification A = B

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 oscilloscope

becomes the specified value.
(When the AMS knob is rotated, the   of “EFB-   ” changes and
the waveform changes.) In this adjustment, waveform varies at
intervals of approx. 3%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(MO groove read power traverse adjustment)

(Traverse Waveform)

VC

A

B

Specification A = B

9. Press the ENTER/YES button, display “EFB = $   SAVE” 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.

Specification A = B

VC

A

B

12. Press the ENTER/YES button, display “EFB =   SAVE” 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 test disc 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 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)

Specification A = B

17. Press the ENTER/YES button, display “EFB = $   SAVE” for a

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

18. Press the EJECT button and remove the test disc TDYS-1.

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

330k

Ω

10pF

TP (TEO)

TP (VC)