Sony MDS-JE530 service manual 28, Focus Bias Adjustment, Adjusting Procedure

Page 28
12.FOCUS BIAS ADJUSTMENT

8.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob so that the waveform of the oscilloscope becomes the specified value.

(When the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob is turned, the – 28 –Manual background of “EFB-

Manual backgroundManual background ” changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the wave- form so that the specified value is satisfied as much as pos- sible.

(Write power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

9.Press the [YES] button, and save the adjustment results in the

non-volatile memory. (“EFB = Manual backgroundManual background SAV” will be displayed for a moment.)

10.“EFB = Manual backgroundManual background MO-P”. will be displayed.

The optical pick-up moves to the pit area automatically and servo is imposed.

11.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob until the waveform of the os- cilloscope moves closer to the specified value.

In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Traverse Waveform)

A

VC

B

Specification A = B

12.Press the [YES] button, and save the adjustment results in the

non-volatile memory. (“EFB = Manual backgroundManual background SAV” will be displayed for a moment.)

Next “EF MO ADJUS” is displayed. The disc stops rotating automatically.

13.Press the [ÊÊÊÊÊEJECT]¤ button and take out the disc.

14.Load the check disc (MD) TDYS-1.

15.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “EF CD ADJUS” (C12).

16.Press the [YES] button and display “EFB = Manual backgroundManual background CD”. Servo is imposed automatically.

17.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob so that the waveform of the oscilloscope moves closer to the specified value.

In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Traverse Waveform)

A

VC

B

Specification A = B

18.Press the [YES] button, display “EFB = Manual backgroundManual background SAV” for a mo- ment and save the adjustment results in the non-volatile memory.

Next “EF CD ADJUS” will be displayed.

19.Press the [ÊÊÊÊÊEJECT]¤ button and take out the disc.

12.FOCUS BIAS ADJUSTMENT

Adjusting Procedure :

1.Load the continuously-recorded disc. (Refer to “5. CREAT-

ING CONTINUOUSLY-RECORDED DISC”)

2.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “CPLAY MODE” (C29).

3.Press the [YES] button and display “CPLAY MID”.

4. Press the [MENU/NO] button when “C =

AD = ” is

displayed.

 

5.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “FBIAS ADJUS” (C13).

6.Press the [YES] button and display “ Manual backgroundManual backgroundManual backgroundManual background /Manual backgroundManual background a = Manual backgroundManual background ”.

The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [a =] indicate the focus bias value.

7.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob in the clockwise direction and find the focus bias value at which the C1 error rate becomes about 200 (Refer to Note 2).

8.Press the [YES] button and display “ Manual backgroundManual backgroundManual backgroundManual background /Manual backgroundManual background b = Manual backgroundManual background ”.

9.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob in the counterclockwise di- rection and find the focus bias value at which the C1 error rate becomes about 200.

10.Press the [YES] button and display “ Manual backgroundManual backgroundManual backgroundManual background /Manual backgroundManual background c = Manual backgroundManual background ”.

11.Check that the C1 error rate is below 50 and ADER is 00. Then press the [YES] button.

12.If the “( Manual backgroundManual backgroundManual backgroundManual background )” in “ Manual backgroundManual backgroundManual backgroundManual background - Manual backgroundManual backgroundManual backgroundManual background - Manual backgroundManual backgroundManual backgroundManual background (Manual backgroundManual backgroundManual backgroundManual background)” is above 20, press the [YES] button.

If below 20, press the [MENU/NO] button and repeat the ad- justment from step 2.

13.Press the [ÊÊÊÊÊEJECT]¤ button and take out the disc.

Note 1: The relation between the C1 error and focus bias is as shown in the following figure. Find points A and B in the following figure using the above adjustment. The focal point position C is auto- matically calculated from points A and B.

Note 2: As the C1 error rate changes, perform the adjustment using the average vale.

C1 error

about 200

B

C

A

Focus bias value

 

 

 

(F. BIAS)

– 28 –

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Contents SPECIFICATIONS SERVICE MANUALSupplied accessories MDS-JE530SELF-DIAGNOSISFUNCTION – 2 –Items of Error History Mode Items and Contents Table of Error Codes– 3 – Selecting the Test ModeTABLE OF CONTENTS 6.DIAGRAMSDISASSEMBLY ELECTRICAL ADJUSTMENTSFlexible Circuit Board Repairing Notes on chip component replacement– 5 – ADVARSEL– 6 – JIG FOR CHECKING BD BOARD WAVEFORMRecord Precedure – 7 –Display Precedure CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS – 8 –– 9 – RETRY CAUSE DISPLAY MODEPrecedure Fig. 1 Reading the Test Mode DisplayHexadecimal nBinary Conversion Table – 10 –Reading the Display SECTION GENERAL – 11 –LOCATION OF CONTROLS This section is extracted from instruction manualPage SECTION DISASSEMBLY – 13 –CASE FRONT PANEL SECTIONMAIN BOARD – 14 –MECHANISM DECK SECTTION MDM-5D SLIDER CAM – 15 –BASE UNIT MBU-5D,BD BOARD – 16 – SW BOARD, LOADING MOTOR M1031. PRECAUTIONS FOR USE OF TEST MODE 2. SETTING THE TEST MODESECTION TEST MODE – 17 –– 18 – 5. SELECTING THE TEST MODE5-1.Operating the Continuous Playback Mode – 19 –5-3. Non-VolatileMemory Mode EEP MODE 6. FUNCTIONS OF OTHER BUTTONS – 20 –7. TEST MODE DISPLAYS – 21 – MEANINGS OF OTHER DISPLAYS1.PARTS REPLACEMENT AND ADJUSTMENT SECTION ELECTRICAL ADJUSTMENTS– 22 – 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSION 4. PRECAUTIONS FOR ADJUSTMENTSLaser power meter – 23 –Checking Procedure 6-2.Laser Power CheckSpecification – 24 –6-5.C PLAY Checking MO Error Rate Check CD Error Rate Check– 25 – 6-4.Focus Bias Check7. INITIAL SETTING OF ADJUSTMENT VALUE 9. TEMPERATURE COMPENSATION OFFSET ADJUSTMENT10. LASER POWER ADJUSTMENT Setting Procedure11. TRAVERSE ADJUSTMENT – 27 –Specification Adjusting Procedure– 28 – 12.FOCUS BIAS ADJUSTMENTAdjusting Procedure 13.ERROR RATE CHECK 15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT13-1.CD Error Rate Check 13-2.MO Error Rate CheckAdjustment Location – 30 –– BD BOARDSide A – – BD BOARDSide B –MDS-JE530 SECTION DIAGRAMS 6-1.BLOCK DIAGRAM – MD SERVO Section –– 31 – – 32 –6-2.BLOCK DIAGRAM – MAIN Section – MDS-JE530– 33 – – 34 –Note on Printed Wiring Board – 35 –Note on Schematic Diagram – 36 – • Circuit Boards Location6-4.PRINTED WIRING BOARD – BD Board – – 38 –•See page 36 for Circuit Boards Location •Semiconductor Location– 40 – – 39 –MDS-JE530 6-6.SCHEMATIC DIAGRAM – BD Board 2/2 – See• – 41 –– 42 – MDS-JE5306-7.SCHEMATIC DIAGRAM – SW Board – 6-8.PRINTED WIRING BOARD – SW Board –– 43 – – 44 –6-9.PRINTED WIRING BOARD – MAIN Board – See• – 45 –– 46 – page 36 for Circuit Boards Location– 47 – – 48 –MDS-JE530 Page Page 41 Page– 50 – – 49 –MDS-JE530 – 51 – – 52 –MDS-JE530 • Semiconductor Location– 53 – – 54 –MDS-JE530 Page 47 Page•IC Block Diagrams – BD Board – – 55 –– 56 – IC101– 57 – IC310M5293L IC431– 58 – 6-14.IC PIN FUNCTION DESCRIPTION– 59 – •BD BOARD IC121 CXD2656R– 60 – – 61 – – 62 – •MAIN BOARD IC501 M30624MG-207FPSYSTEM CONTROLLER– 63 – – 64 – – 65 – SECTION EXPLODED VIEWS1CHASSIS SECTION 2FRONT PANEL SECTION 61 64 61 63 61 66 61 6151 53 59 54 52– 67 – 3MECHANISM SECTION MDM-5D 213 207202 201 223 207– 68 – 4BASE UNIT SECTION MBU-5D 252263 270 254 253SECTION ELECTRICAL PARTS LIST – 69 –DISPLAY – 70 –– 71 – KEY SWDISPLAY – 72 – MAINKEY SW – 73 – MAIN– 74 – MAIN– 75 – POWER SWMAIN MDS-JE530 – 76 –Sony Corporation 9-928-824-11
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