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Subject : Electrical Adjustments

AEP Model

UK Model

E Model

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This set has the test mode functionality. The test mode should be
always set before performing adjustments.

<Setting the Test Mode>
1. Input the specified voltage (14.4 V) to the ACC and BATT

terminals.

2. “1:00” is displayed on the LCD display.
3. Press   4   key.
4. Press   5   key.
5. Press   1  key for more than 2 seconds.
6. All segments are lit on the LCD display entering the test mode.

<Releasing the Test Mode>
1. Press  OFF  key.

1. Once the test mode is set, each pressing of the  DSPL  key will

cause the LCD display to change as follows:

All segments ON

Press  DSPL  key.

Half segments ON (1)

Press  DSPL  key.

Half segments ON (2)
(The other half segments that were OFF in (1) are ON.)

Press  DSPL  key.

All segments OFF

Press  DSPL  key.

1. Set the test mode.
2. Insert a disc and press  5  key.
3. Each time  6  key is pressed, the mode will change as follows:

ADJUSTMENT mode “SHUF” indication off

Press  6  key.

PLAY mode “SHUF1” indication is lit.

Press  6  key.

REC mode “SHUF2” indication is lit.

Press  6  key.

Unused mode “SHUF ALL” indication is lit.

Press  6  key.

Key

Description of test

2

Laser power adjustment mode

3

Traverse adjustment mode

4

Focus bias adjustment mode

5

STOP

6

Switch the mode

ENTER

CLV jitter measurement

DSPL

Select the display

Key

Description of test

2

Laser power check mode

3

Focus + CLV ON

4

Tracking servo ON/OFF

5

STOP

6

Switch the mode

ENTER

CPLAY mode (middle/outer/inner area)

DSPL

Select the display

Key

Description of test

2

Laser power check mode

3

Focus + CLV ON

4

Tracking servo ON/OFF

5

STOP

6

Switch the mode

ENTER

CREC mode (middle/outer/inner area)

DSPL

Select the display

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1. Perform the following adjustments as listed when the optical pick-

up and IC400, IC402 and/or IC440 in the MD SERVO board
have been replaced:
(1) Laser power adjustment
(2) Traverse adjustment
(3) Focus bias adjustment
(4) CD error rate check
(5) MO error rate check

2. Set the test mode to perform these adjustments. Release the test

mode after the adjustments are completed.

3. Perform the adjustments in the order that they are listed.
4. Use the following jigs and measuring equipment:

• Test disc (special disc for playback) TDYS-1

(Part No.: 4-963-646-01)

• Laser power meter LPM-8001

(Part No.: J-2501-046-A)

• Oscilloscope (Measure after the probe is calibrated.)
• Digital voltmeter

5. When observing multiple signals with an oscilloscope or other

equipment, take care to prevent connection between VC and
ground in the oscilloscope. (Otherwise, VC and ground are
shorted.)

• This disc is used for focus bias adjustment and error rate check.

This disc is prepared as follows:

1. Set the test mode. (See page 2.)
2. Insert a commercial disc (blank) and press  5  key.
3. Press  6  key twice to set the REC mode.

(Verify that the “SHUF2” indication is lit on the LCD display.)

4. Verify that no number is displayed at the disc No. indicator.

If any number is displayed, repeatedly press  DSPL  key until the
number disappears (only two digits are displayed).

5. Press  ENTER  key three times and verify that there is no disc

number displayed (the disc is recorded from the inner area).
If “3” or “7” is displayed, press  ENTER  key again to clear the
indicator.

LCD display

6. Record the data until the disc number indicator shows “9” and

then press  5  key to stop recording.

7. Press  Z  key and take out the disc.

The continuously recorded disc for focus bias adjustment and error
rate check is now prepared.
Note:
Take care to prevent vibrations during continuous recording.

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KMS-263A
2 7 X 9 3
B 0 8 2 5

Ω

  For the measurement points, see page 7.

Procedure:
<Setting the write power reference value>
1. Connect a digital voltmeter between TP (I+3V) and TP (IOP).
2. Set the test mode. (See page 2.)
3. Insert a laser power meter into the disc insertion port and press  5

key.

4. Press  2  key.

LCD display

+
–

5. Use   DISC +   or   DISC –   key to adjust so that the reading on

the laser power meter is 6.9 to 7.1 mW.

6. Press   + > M   key for 2 seconds to save the data that has

been set in step 5.

7. Verify that the digital voltmeter reads out the specified value.

Specified value:
Reading on the digital voltmeter: Optical pick-up label indication
value ±10%

<Setting the read power reference value>
8. Press  2  key.

LCD display

9. Use   DISC +   or   DISC –   key to adjust so that the reading on

the laser power meter is 0.69 to 0.71 mW.

10. Press   + > M   key for 2 seconds to save the data that has

been set in step 9.

11. Press  2  key.

LCD display

12. Verify that the reading on the laser power meter is 6.0 to 6.4

mW.
If outside the specified value, adjust again from step 1.

13. Press  2  key. The laser power adjustment is completed.