SERVICE MANUAL - MiniDisc Community Page
Contents
1. Fos 308 B 03 G Mode No Focus Bias Adj Represents the Indicates the C1 error rate calculated point C measurement i m 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 Note 2 The relationship between C1 error rate and focus bias amount 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 C1 error rate Focus bias amount F BIAS Ja B C A ry CD ERROR RATE CHECK Procedure 1 2 3 6 7 Set the test mode See page 2 Insert the test disc TDYS 1 and press 5 key Press 6 key to set the PLAY mode Verify that the SHUF1 indication is lit on the display Verify that no number is displayed at the disc No indicator If any number is displayed repeatedly press DSPL the number disappears only two digits are displayed key until Press ENTER key and verify that the disc No indicator shows 3 ENTER If 7 is shown or there is no display repeatedly press key until 3 is displayed LCD display ry MD 4 6 L PLAY mode C2. after the probe is calibrated e 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 w PREPARING A CONTINUOUSLY RECORDED DISC e 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 iS MD T Yaw 42 Co Disc No indicator REC mode 6 Record the data until the disc number indicator shows 9 and then press 5 key to stop recording 7 Press 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 recordin
3. 1 error rate Yaw SHE Disc No indicator Verify that the C1 error rate is 0 30 or less 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 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 the number disappears only two digits are displayed 5 Press ENTER key and verify that the disc No indicator shows 3 key until If 7 is shown or there is no display repeatedly press ENTER key until 3 is displayed LCD display iS MD 4 6 CS PLAY mode C1 error rate Yaw 368 Disc No indicator 6 Verify that the C1 error rate is 0 30 or less 7 Press 5 key The MO error rate check is completed Measurement points MD SERVO BOARD SIDE A IOP VC TE MDX C800REC 9 870 144 82 Sony Corporation AEN Audio Entertainment Group Printed in Japan 2000 6 8 Published by ME General Engineering Dept
4. MDX C800REC SONY US Model SERVICE MANUAL Cat aN SUPPLEMENT 1 File this supplement with the Subject Electrical Adjustments m ELECTRICAL ADJUSTMENT ADJUSTMENT mode SHUF indication off TEST MODE This set has the test mode functionality The test mode should be always set before performing adjustments lt Setting the Test Mode gt 1 Input the specified voltage 14 4 V to the ACC and BATT terminals 1 00 is displayed on the LCD display Press 4 key Press 5 key Press 1 key for more than 2 seconds AnA UN lt Releasing the Test Mode gt 1 Press OFF key DISPLAY TEST 1 Once the test mode is set each pressing of the DSPL cause the LCD display to change as follows All segments are lit on the LCD display entering the test mode key will 1 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 Y ADJUSTMENT mode SHUF indication off Press 6 key PLAY mode SHUF1 indication is lit y Press 6 key REC mode SHUF2 ind
5. ds to save the data that has been set in step 9 11 Press 2 key LCD display Se MD ous 162 G Mode No Main beam conversion power LD Power Adj 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 TRAVERSE ADJUSTMENT Connection oscilloscope MD servo board V 0 5 V div H 10 ms div Input DC mode Procedure 1 2 3 4 8 Connect an oscilloscope between TP TE and TP VC Set the test mode See page 2 Insert the test disc TDYS 1 and press 5 key Press 3 key LCD display K3 NA fe Kew TEF 14 14 G Mode No Represents Initial set value Value after EF B Adj EF adjustment automatic adjustment The traverse is automatically adjusted Verify that the waveform of the oscilloscope meets the specified value 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 Traverse waveform VC Specification A B Press PP PP key for 2 seconds to save the data set in steps 5 and 6 After saving the data verify that the initial set value
6. g m For the measurement points see page 7 LASER POWER ADJUSTMENT Connection laser power meter optical pick up objective lens digital voltmeter MD servo board TP I 3V TP IOP Procedure lt Setting the write power reference value gt 1 Connect a digital voltmeter between TP 1 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 iS MD few 178 G Mode No 7 0 mW power LD Power Adj 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 PI gt P 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 Optical pick up label KMS 263A 27X93 B0825 ra In this case lop 82 5 mA lop mA Reading on the digital voltmeter mV 1 Q lt Setting the read power reference value gt 8 Press 2 key LCD display lt P Fes 107 G Mode No 0 7 mW power LD Power Adj 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 PPI gt P key for 2 secon
7. ication is lit y Press 6 key Unused mode SHUF ALL indication is lit Press 6 key Description of test Laser power adjustment mode Traverse adjustment mode Focus bias adjustment mode STOP Switch the mode CLY jitter measurement PLAY mode SHUF1 Select the display Description of test Laser power check mode Focus CLV ON Tracking servo ON OFF STOP Switch the mode CPLAY mode middle outer inner area REC mode SHUF2 Select the display Description of test Laser power check mode Focus CLV ON Tracking servo ON OFF STOP Switch the mode CREC mode middle outer inner area Select the display Unused mode SHUF ALL NOTES FOR ADJUSTMENT 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 Perform the adjustments in the order that they are listed 4 Use the following jigs and measuring equipment e Test disc special disc for playback TDYS 1 Part No 4 963 646 01 e Laser power meter LPM 8001 Part No J 2501 046 A e Oscilloscope Measure
8. is equal to the value after automatic adjustment Press 3 key The traverse adjustment is completed E FOCUS BIAS ADJUSTMENT Procedure 1 Set the test mode 2 Insert the continuously recorded disc see page 3 and press key See page 2 Nn 3 Press 4 key and check the error rate in the current focus bias setting AAD Feu FE 8 05 G Mode No Focus Bias Adj LCD display AD Represents the Indicates the initial measurement C1 error rate lt Setting the focus bias point A gt 4 Verify that the first digit of the C1 error rate are 0 Then press 4 key ZAIN ens LCD display 5 Press DISC ke Note 1 MD fos 31883 Mode No Focus Bias Adj point A measurement Represent the Indicates the C1 error rate y until the C1 error rate value reaches 1 00 6 Press PPI gt gt key for 2 seconds to save the data set in step 5 lt Setting the focus bias point B gt 7 Press 4 key UA Feel F8 2 09 Mode No Focus Bias Adj 8 Press DISC ke Note 1 LCD display HD Represents the Indicates the C1 error rate point B measurement y until the C1 error rate value reaches 1 00 9 Press PPI PP key for 2 seconds to save the data set in step 8 10 Press 4 key AI ens LCD display AD
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