MDX-C800REC (serv.man3) - Sony Car Audio Service Manual (repair manual). Page 3

3

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.