Sony MDS-NT1 service manual Initial Setting of Adjustment Value, Recording and Displaying the Iop

MDS-NT1

5-8. INITIAL SETTING OF ADJUSTMENT VALUE

Note:

Mode which sets the adjustment results recorded in the non-volatile memory to the initial setting value. However the results of the tempera- ture compensation offset adjustment will not change to the initial setting value.

If initial setting is performed, perform all adjustments again excluding the temperature compensation offset adjustment.

For details of the initial setting, refer to “5-5. Precautions for Adjustments” and execute the initial setting before the adjustment as required.

Setting Procedure:

1.Click the [JOG UP] or [JOG DOWN] to display “ADJ CLEAR” (C28).

2.Click the [ENTER/YES]. “Complete!” will be displayed mo- mentarily and initial setting will be executed, after which “ADJ CLEAR” (C28) will be displayed.

5-9. RECORDING AND DISPLAYING THE Iop

INFORMATION

The Iop data can be recorded in the non-volatile memory. The Iop value on the optical pick-up label and the Iop value after the ad- justment will be recorded. Recording these data eliminates the need to read the label on the optical pick-up.

Recording Procedure:

1.Click the [JOG UP] or [JOG DOWN] to display “Iop Write” (C05), and click the [ENTER/YES].

2.The display becomes “Ref=@@@.@” (@ is an arbitrary num- ber) and the numbers which can be changed will blink.

3.Input the Iop value on the optical pick-up label.

To select the number : Click the [JOG UP] or [JOG DOWN].

To select the digit : Click the [PUSH].

4.When the [ENTER/YES] is clicked, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

5.As the adjustment results are recorded for the 4 value. Leave it as it is and click the [ENTER/YES].

6.“Complete!!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write” (C05).

Display Procedure:

1.Click the [JOG UP] or [JOG DOWN] to display “Iop Read” (C26), and click the [ENTER/YES].

2.“@@.@/##.#” is displayed and the recorded contents are dis- played.

@@.@ indicates the Iop value on the optical pick-up label. ##.# indicates the Iop value after adjustment

3.To end, click the [PUSH] or [MENU/NO] to display “Iop Read” (C26).

5-10. TEMPERATURE COMPENSATION OFFSET ADJUSTMENT

Save the temperature data at that time in the non-volatile memory as 25 ˚C reference data.

Note:

1.Usually, do not perform this adjustment.

2.Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C. Perform it immediately after the power is turned on when the internal temperature of the unit is the same as the ambient temperature of 22 ˚C to 28 ˚C.

3.When D101 has been replaced, perform this adjustment after the tem- perature of this part has become the ambient temperature.

Adjusting Procedure:

1.Click the [JOG UP] or [JOG DOWN] to display “TEMP AD- JUST” (C03).

2.Click the [ENTER/YES] to select the “TEMP ADJUST” mode.

3.“TEMP = [OK” and the current temperature data will be displayed.

4.To save the data, click the [ENTER/YES].

When not saving the data, click the [MENU/NO].

5.When the [ENTER/YES] is clicked, “TEMP = SAVE” will be displayed and turned back to “TEMP ADJUST” (C03) dis- play then. When the [MENU/NO] is clicked, “TEMP ADJUST” (C03) will be displayed immediately.

Specified Value:

The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”, “10 - 1F” and “20 - 2F”.

5-11. LASER POWER ADJUSTMENT

Check the Iop value of the optical pick-up before adjustments. (Refer to 5-9. Recording and Displaying Iop Information)

Connection:

laser

power meter

Optical pick-up objective lens

digital voltmeter

BD board
CN105 pin 1 (I +3 V)		+
CN105 pin 2	(Iop)	–

Adjusting Procedure:

1.Set the laser power meter on the objective lens of the optical pick-up. (When it cannot be set properly, click the [FF] or [FR] to move the optical pick-up)

Connect the digital voltmeter to CN105 pin 1 (I+3V) and CN105 pin 2 (Iop) on the BD (MD) board.

2.Click the [JOG UP] or [JOG DOWN] to display “LDPWR ADJUST” (C04).

(Laser power : For adjustment)

3.Click the [ENTER/YES] once to display “L 0.90 mW $ ”.

4.Click the [JOG UP] or [JOG DOWN] so that the reading of the laser power meter becomes specified value. Click the [ENTER/YES] after setting the range knob of the laser power meter, and save the adjustment results. (“LD SAVE $ ” will be displayed for a moment)

Specified Value:

Laser power meter reading: 0.85 to 0.91 mW (KMS-262A)

0.90to 0.95 mW (KMS-262E)

5.Then “L 8.40 mW $ ” (KMS-262A) or “L 8.65 mW $ ” (KMS-262E) will be displayed.

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