Sony MDS-JD320 service manual Traverse Adjustment, Adjusting method, Connection

5-7. TRAVERSE ADJUSTMENT

Connection :

Oscilloscope

BD board

CN110 pin 3 (TEO)

CN110 pin 2 (VC)

V : 0.5 V/div

H : 10 ms/div

Input : DC mode

Adjusting method :

1.Connect an oscilloscope to CN110 pin 3 (TEO) and CN110 pin 2 (VC) of the BD board.

2.Load a disc (any available on the market). (Refer to Note 1.)

3.Press the 0button or )button and move the optical pick- up outside the pit.

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

5.Press the YES button and display “EFB = MO-R”.

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

6.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. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Read power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

7.Press the YES button and save the result of adjustment to the

non-volatile memory (“EFB = SAVE” will be displayed for

a moment. Then “EFB = MO-W” will be displayed).

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. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Write power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

9.Press the YES button, and save the adjustment results in the

non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

10.“EFB = MO-P”. will be displayed.

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

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. 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 “EFBAL CD” is displayed. The disc stops rotating automatically.

13.Press the ¤EJECT button and remove the disc.

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

15.Press the 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. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Traverse Waveform)

A

VC

B

Specification A = B

17.Press the YES button, display “EFB = SAVE” for a moment and save the adjustment results in the non-volatile memory. Next “EFBAL ADJUST” will be displayed.

18.Press the ¤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 oscilloscope as shown in the following figure so that it can be seen more clearly.

Oscilloscope

BD board	330 k Ω
CN110 pin 3 (TEO)	10pF
CN110 pin 2 (VC)

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