Sony 4-216-840-0 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

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13.ERROR RATE CHECK

13-1. CD Error Rate Check

Checking Procedure :

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

2.Turn the =AMS + knob and display “CPLAY MODE” (C30).

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

4.The display changes to “C1 = AD = ”.

5.Check that the C1 error rate is below 20.

6.Press the [MENU/NO] button, stop playback, press the [ÊÊÊÊÊEJECT]¤ button and take out the check disc.

13-2. MO Error Rate Check

Checking Procedure :

1.Load the test disc (MDW-74/AU-1).

2.Turn the =AMS + knob and display “CPLAY MODE” (C30).

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

4.The display changes to “C1 = AD = ”.

5.If the C1 error rate is below 50, check that ADER is 00.

6.Press the [MENU/NO] button, stop playback, press the [ÊÊÊÊÊEJECT]¤ button and take out the test disc.

14. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount. Checking Procedure :

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

ING CONTINUOUSLY-RECORDED DISC”)

2.Turn the =AMS + knob and display “CPLAY MODE” (C30).

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

4.Press the [MENU/NO] button when “C1 = AD = ” is displayed.

5.Turn the =AMS + knob and display “FBIAS CHECK” (C05).

6.Press the [YES] button and display “ / c = ”.

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

Check that the C1 error is below 50 and ADER is below 2.

7.Press the [YES] button and display “ / b = ”. Check that the C1 error is about 200 and ADER is below 2.

8.Press the [YES] button and display “ / a = ”. Check that the C1 error is about 200 and ADER is below 2

9.Press the [MENU/NO] button, next press the [ÊÊÊÊÊEJECT]¤ but- ton and take out the disc.

Note 1: If the C1 error and ADER are above other than the specified value at points a (step 8. in the above) or b (step 7. in the above), the focus bias adjustment may not have been carried out prop- erly. Adjust perform the beginning again.

15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the pickup is replaced. If the adjustment results becomes “Adjust NG!”, the pickup may be faulty or the servo system circuits may be abnormal.

15-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the check disc (MD) TDYS-1.

2.Turn the =AMS + knob to display “AG Set (CD)” (C26).

3.When the [YES] button is pressed, the adjustment will be per- formed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (CD)”.

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

15-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the test disc (MDW-74/AU-1) for recording.

2.Turn the =AMS + knob to display “AG Set (MO)” (C25).

3.When the [YES] button is pressed, the adjustment will be per- formed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (MO)”.

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

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Contents MDS-JE520 SpecificationsMDM-5A SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Diagrams Table of ContentsSection Servicing Notes Flexible Circuit Board Repairing VarningJIG for Checking BD Board Waveform IOPRecord Precedure Checks Prior to Parts Replacement and Adjustments Criteria for Determination Measure if unsatisfactoryRetry Cause Display Mode PrecedureHexadecimal nBinary Conversion Table Section General Cover Section DisassemblyFront Panel Section Main Board Mechanism Deck Section MDM-5ASlider CAM Base Unit MBU-5A, BD BoardSW BOARD, Loading Motor M103 Section Test Mode Precautions for USE of Test ModeSetting the Test Mode Exiting the Test ModeSelecting the Test Mode Display Contents Mark GroupOperating the Continuous Playback Mode Non-Volatile Memory Mode EEP ModeMID OUTTest Mode Displays Functions of Other ButtonsMeanings of Other Displays Section Electrical Adjustments Parts Replacement and AdjustmentPrecautions for Checking Laser Diode Emission Precautions for USE of Optical PICK-UP KMS-260APrecautions for Adjustments Laser power meterTemperature Compensation Offset Check Laser Power CheckCheck Prior to Repairs Traverse CheckPlay Checking MO Error Rate Check CD Error Rate CheckFocus Bias Check Self-Recording/playback CheckInitial Setting of Adjustment Value Temperature Compensation Offset AdjustmentLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment ING CONTINUOUSLY-RECORDED DiscError Rate Check Auto Gain Control Output Level AdjustmentCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjustment Location Section Diagrams IC PIN Function DescriptionMNT2 Xbusy XlatSrdt SensXras XWEAsyo AsyiFS4 SrdrSfdr SprdAder ByteCnvss RSTSTB ChackLdin LD-LOWBlock Diagram MD Servo Section ∙ Signal PathPlay Analog OUT REC Analog REC DigitalBlock Diagram Main Section REC AnalogCircuit Boards Location CNDSemiconductor Location MDS-M100 Schematic Diagram BD Board 2/2 See 65 for Waveforms. See page 51 for IC Block DiagramSchematic Diagram SW Board Printed Wiring Board SW BoardIC121 CXD2654R Main Board IC301 ΜDA1341TS/N2IC406 M62016L IC421 M5293L IC152 BH6511FS-E2MDS-M100 Semiconductor Location Schematic Diagram Main Board 1/2 See page 65 for Waveform MDS-M100 Ref. No Location D741 D742 IC761 Q741 Q742 Q767 MDS-M100 Exploded Views SectionCover Section Chassis Section AEP, SPMechanism Section MDM-5A 201 206 204 205209 4-988-466-11 Spring ELECTROSTATIC, Leaf 221 A-4680-409-A Holder Complete AssyBase Unit Section MBU-5A Section Electrical Parts List AC Select BDShort Switch IC/TRANSISTORCXA2523AR Transistor FMW1Main ConnectorCeramic Carbon InductorExcept US, CND Main Panel Panel SW Trans Sony Corporation
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