Sony MDS-JB920 service manual Record Precedure

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IOP Data Recording and Display When Pickup and Non-volatile Memory (IC171 of BD board) are Replaced

The IOP value labeled on the pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up. When replacing the pick-up or non-volatile memory (IC171 of BD board), record the IOP value on the pick-up according to the following procedure.

Record Precedure:

1.While pressing the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and[ÊÊ]pbutton, connect the power plug to the outlet, and release the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and[ÊÊ]p button.

2.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “[Service]”, and press the [YES] button.

3.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “lop.Write” (C28), and press the [YES] button.

4.The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.

5.Input the IOP value written on the optical pick-up.

To select the number : Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.

To select the digit

: Press the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.

6.When the [YES] button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7.As the adjustment results are recorded for the 6 value. Leave it as it is and press the [YES] button.

8.“Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.

9.Press the [REPEAT] button to complete. “Standby” will be displayed.

Display Precedure:

1.While pressing the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and [ÊÊ]p button, connect the power plug to the outlet, and release the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and [ÊÊ]p button.

2.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “[Service]”, and press the [YES] button.

3.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “lop.Read” (C27).

4.“@@.@/##.#” is displayed and the recorded contents are displayed. @@.@ : indicates the Iop value labeled on the pick-up.

##.# : indicates the Iop value after adjustment

5.To end, press the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± button or [MENU/NO] button to display “Iop Read”. Then press the [REPEAT] button to display “Standby”.

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Contents MDS-JE520 SpecificationsMDM-5A General SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents Diagrams Table of ContentsSection Servicing Notes Varning Flexible Circuit Board RepairingVaroitus IOP JIG for Checking BD Board WaveformRecord Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsREC/PLAY Precedure Retry Cause Display ModeHexadecimal nBinary Conversion Table Location of Controls Section GeneralFront view Rear view Page Page Case Section DisassemblyMain Board Front Panel SecitonSlider CAM Mechanism Section MDM-5ASW BOARD, Loading Motor M103 Base Unit MBU-5A, BD BoardExiting the Test Mode Section Test ModePrecautions for USE of Test Mode Setting the Test ModeDisplay Contents Mark Group Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID Detrack check display Not used in servicing Test Mode DisplaysFunctions of Other Buttons Auto gain display Not used in servicingMeanings of Other Displays Display Contents When Lit When OffParts Replacement and Adjustment Section Electrical AdjustmentsLaser power meter Precautions for Checking Laser Diode EmissinonPrecautions for USE of Optical PICK-UP KMS-260A Precautions for AdjustmentsTraverse Check Temperature Compensation Offset CheckLaser Power Check Check Prior to RepairsSelf-Recording/playback Check Play Checking MO Error Rate CheckCD Error Rate Check Focus Bias CheckRecording and Displaying the IOP Information Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Laser Power AdjustmentTraverse Adjustment Focus Bias Adjustment MO Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment CD Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMP Section DiagramsIC PIN Function Description Sqsy SrdtSens XrstAsyo XrasXWE MvciSpfd SrdrSfdr SprdMain Board IC100 CXD8607N A/D Converter Lvdd AvddlVDD1 TEST2Main Board IC800 M30610MCA-264FP System Controller MDS-JB920 REC Digital Block Diagram Servo Section∙ Signal Path REC Analog∙ Signal Path Play Analog OUT Block Diagram Main SectionPlay Digital OUT Circuit Boards Location Printed Wiring Boards BD Section MDS-JB920 53 for Waveforms. See page 70 and 71 for IC Block Diagrams Schematic Diagram BD /2 SeeWaveforms BD board Main board Disp board MDS-JB920 MDS-JB920 MDS-JB920 MDS-JB920 Other layers pattern Side a US, CND Schematic Diagram Panel Section See page 54 for Waveforms CXA2523AR Schematic Diagram BD Switch SectionPrinted Wiring Board BD Switch Section IC Block Diagrams BD Board IC101IC152 BH6511FS-E2 IC121 CXD2654RCXA8042AS Main Board IC100 CXD8607NIC101 CXA8054M IC203IC200 CXD8767N SN74HCU04ANS-E20 SN74HC153ANSChassis Section Section Exploded ViewsSupplied with RV760 Front Panel Section204 205 206 201209 4-988-466-21 Spring ELECTROSTATIC, Leaf Base Unit Section MBU-5A Section Electrical Parts List CXA2523AR TANTAL. ChipDiode Diode F1J6TPDisp Main C252 Mylar SN74HC153ANS HZS6C1LHZ7.5CP-TK CXA8042AS390 LED SEL6810A-TH10 Mega Control Transistor Main PSWCoil with Core Vibrator LED SEL6210S-TH10 StandbySW VOL Sony Corporation
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