Sony MDX-C800REC Betriebsanleitung

SUPPLEMENT-1

File this supplement with the service manual.

Subject : Electrical Adjustments

SERVICE MANUAL

MDX-C800REC

US Model

Canadian Model

TEST MODE

This set has the test mode functionality. The test mode should be

always set before performing adjustments.

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.

1. Press OFF key.

DISPLAYTEST

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.

TEST MODE STRUCTURE

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.

ELECTRICAL ADJUSTMENT

ADJUSTMENT mode: SHUF indication off

Key Description of test

2 Laser power adjustment mode

3 Traverse adjustment mode

4 Focus bias adjustment mode

5STOP

6 Switch the mode

ENTER CLV jitter measurement

DSPL Select the display

PLAY mode: SHUF1

Key Description of test

2 Laser power check mode

3 Focus + CLV ON

4 Tracking servo ON/OFF

5STOP

6 Switch the mode

ENTER CPLAY mode (middle/outer/inner area)

DSPL Select the display

REC mode: SHUF2

Key Description of test

2 Laser power check mode

3 Focus + CLV ON

4 Tracking servo ON/OFF

5STOP

6 Switch the mode

ENTER CREC mode (middle/outer/inner area)

DSPL Select the display

Unused mode: SHUF ALL

NOTES FOR ADJUSTMENT

1. Perform thefollowingadjustmentsas listed whenthe opticalpick-

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.)

PREPARING A CONTINUOUSLY RECORDED DISC

• 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 Zkey 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.

SHUF 2

Disc No. indicator REC mode

KMS-263A

27X93

B0825

(Optical pick-up label)

In this case, Iop = 82.5 mA

Iop (mA) = Reading on the digital voltmeter (mV)/1 (Ω

)

For the measurement points, see page 7.

LASER POWER ADJUSTMENT

Connection:

Procedure:

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

–

optical pick-up

objective lens

laser power

meter

digital voltmete

MD servo board

TP (I+3V)

TP (IOP)

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 + >Mkey 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%

Mode No.

(LD Power Adj.)

7.0 mW power

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 + >Mkey for 2 seconds to save the data that has

been set in step 9.

11. Press 2 key. LCD display

Mode No.

(LD Power Adj.)

0.7 mW power

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.

Mode No.

(LD Power Adj.)

Main beam conversion power

Mode No.

(Focus Bias Adj.) Represents the

point B measurement

Indicates the C1 error rat

Mode No.

(Focus Bias Adj.) Represent the

point A measurement

Indicates the C1 error rate

Mode No.

(EF-B Adj.) Represents

EF adjustment

Initial set value Value after

automatic

adjustment

TRAVERSE ADJUSTMENT

Connection:

Procedure:

1. Connect an oscilloscope between TP (TE) and TP (VC).

2. Set the test mode. (See page 2.)

3. Insert the test disc TDYS-1 and press 5 key.

4. Press 3 key. LCD display

5. The traverse is automatically adjusted.Verify that the waveform

of the oscilloscope meets the specified value.

6. If outside the specified value, use DISC + or DISC – to adjust

the waveform.

Pressing of DISC + or DISC – will cause the value after

automatic adjustment to be varied.

7. Press + >Mkey for 2 seconds to save the data set in steps

5 and 6.

After saving the data, verify that the initial set value is equal to

the value after automatic adjustment.

8. Press 3 key. The traverse adjustment is completed.

–

oscilloscope

V: 0.5 V/div H: 10 ms/di

Input: DC mode

MD servo board

TP (TE)

TP (VC)

(Traverse waveform)

Specification: A = B

FOCUS BIAS ADJUSTMENT

Procedure:

1. Set the test mode. (See page 2.)

2. Insert the continuously recorded disc (see page 3.) and press 5

key.

3. Press 4 key and check the error rate in the current focus bias

setting. LCD display

4. Verify that the first digit of the C1 error rate are “0”. Then,

press 4 key. LCD display

5. Press DISC + key until the C1 error rate value reaches “1.00”

(Note 1).

6. Press + >Mkey for 2 seconds to save the data set in step

7. Press 4 key. LCD display

8. Press DISC – key until the C1 error rate value reaches “1.00”

(Note 1).

9. Press + >Mkey for 2 seconds to save the data set in step

10. Press 4 key. LCD display

Mode No.

(Focus Bias Adj.) Represents the

initial measurement Indicates the

C1 error rate

Mode No.

(Focus Bias Adj.) Represents the

calculated

point C measurement

Indicates the C1 error rat

11. Verify that the calculated point C error rate is “0.30” or less.

If more than “0.30”, adjust again from step 1.

12. Press 4 key. The focus bias adjustment is completed.

Note 1) Since the C1 error rate varies, the average should be read to

perform this adjustment.

Note2) Therelationship betweenC1 errorrate andfocus biasamount

is shown in the figure below.

Find out the points A and B in the above adjustment. The

total focus point C is automatically calculated from the

points A and B.

CD ERROR RATE CHECK

Procedure:

1. Set the test mode. (See page 2.)

2. Insert the test disc TDYS-1 and press 5 key.

3. Press 6 key to set the PLAY mode.

(Verify that the “SHUF1” indication is lit on the 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 and verify that the disc No. indicator shows

“3”.

If “7” is shown or there is no display, repeatedly press ENTER

key until “3” is displayed.

LCD display

6. Verify that the C1 error rate is “0.30” or less.

7. Press 5 key. The CD error rate check is completed.

MO ERROR RATE CHECK

Procedure:

1. Set the test mode. (See page 2.)

2. Insert the continuously recorded disc (see page 3.) and press 5

key.

3. Press 6 key to set the PLAY mode.

(Verify that the “SHUF1” indication is lit on the 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 and verify that the disc No. indicator shows

“3”.

If “7” is shown or there is no display, repeatedly press ENTER

key until “3” is displayed.

LCD display

6. Verify that the C1 error rate is “0.30” or less.

7. Press 5 key. The MO error rate check is completed.

100

BC A

C1 error rate

Focus bias amount

(F. BIAS)

SHUF 1

Disc No. indicator C1 error ratePLAY mode

SHUF 1

Disc No. indicator C1 error ratePLAY mode

I+3V

IOP

VC TE

Measurement points:

—MD SERVO BOARD (SIDE A) —

MDX-C800REC

Sony Corporation

Audio Entertainment Group

9-870-144-82 2000F0411-1

Published by ME General Engineering Dept.

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