Sony MDS-SD1 Focus Bias Check, Play Checking MO Error Rate Check, CD Error Rate Check

Page 26

10.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the –˜+ knob.

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

11.Press the ENTER/YES button display “EF MO CHECK” The disc stops rotating automatically.

12.Press the § button and remove the disc.

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

14.Roteto the –˜+ knob and display “EF CD CHECK”.

15.Press the ENTER/YES button and display “EFB = CD”. Servo is imposed automatically.

16.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the –˜+ knob.

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

17.Press the ENTER/YES button and display “EF CD CHECK”.

18.Press the § button and remove the check disc (MD) TDYS-1.

Note 1 : MO reading data will be erased during if a recorded disc is used in this adjustment.

Note 2 : If the traverse waveform is not clear, connect the oscillo- scope as shown in the following figure so that it can be seen more clearly.

Oscilloscope

BD board

330 kΩ

CN110 pin 3 (TE)

10pF

CN110 pin 1

(VC)

 

5-6-4. Focus Bias Check

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1.Load a test disk (MDW-74/AU-1).

2.Rotate the –˜+ knob and display “CPLAY MODE”.

3.Press the ENTER/YES button twice and display “CPLAY MID”.

4. Press the

MENU/NO

button when “C1 =

AD = ” is

displayed.

 

5.Rotate the –˜+ knob and display “FBIAS CHECK”.

6.Press the ENTER/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 220 and ADER is below 2.

7.Press the ENTER/YES button and display “ / b = ”. Check that the C1 error is below 220 and ADER is below 2.

8.Press the ENTER/YES button and display “ / a = ”. Check that the C1 error is below 220 and ADER is below 2.

9.Press the MENU/NO button, next press the § button, and remove the test disc.

5-6-5. C PLAY Checking

MO Error Rate Check

Checking Procedure :

1.Load a test disk (MDW-74/AU-1).

2.Rotate the –˜+ knob and display “CPLAY MODE”.

3.Press the ENTER/YES button and display “CPLAY MID”.

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

5.If the C1 error rate is below 80, check that ADER is below 2.

6.Press the MENU/NO button, stop playback, press the § but- ton, and test disc.

CD Error Rate Check

Checking Procedure :

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

2.Rotate the –˜+ knob and display “CPLAY MODE”.

3.Press the ENTER/YES button twice and display “CPLAY MID”.

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

5.Check that the C1 error rate is below 50.

6.Press the MENU/NO button, stop playback, press the § but- ton, and the test disc.

5-6-6. Self-Recording/playback Check

Prepare a continuous recording disc using the unit to be repaired and check the error rate.

Checking Procedure :

1.Insert a recordable disc (blank disc) into the unit.

2.Rotate the –˜+ knob to display “CREC MODE”.

3.Press the ENTER/YES button to display the “CREC MID”.

4.When recording starts, “ REC ” is displayed, this becomes “CREC @@@@" (@@@@ is the address), and recording starts.

5.About 1 minute later, press the MENU/NO button to stop continuous recording.

6.Rotate the –˜+ knob to display “C PLAY MODE”.

7.Press the ENTER/YES button to display “C PLAY MID”.

8.“C1 = AD = ” will be displayed.

9.Check that the C1 error becomes below 80 and the AD error below 2.

10.Press the MENU/NO button to stop playback, and press the § button and remove the disc.

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Contents MDM-5A SpecificationsMDS-JE520 MBU-5ASELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Parts No Flexible Circuit Board RepairingSpecification Label Diagrams Table of ContentsDisassembly Exploded ViewsSection Servicing Note JIG for Checking BD Board WaveformRecord Precedure Checks Prior to Parts Replacement and Adjustments Criteria for Determination Measure if unsatisfactoryForced Reset Main Board Component SideCleaning of Objective Lens of Optical Pickup Fluorescent Indicator Tube and Mechanism DeckAttaching the Glass Assembly Fluorescent Indicator TUBE, LED Complete Lighting CheckServicing Position Cause of Retry Occurring conditions Retry Cause Display ModeHigher Bits Lower Bits Hexa BinaryHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Section General Front Panel Location of Parts and ControlsFront Panel Section DisassemblyGlass Assy Slider CAM Base Unit and BD BoardSW Board and Loading Motor M103 Setting the Test Mode Section Test ModePrecautions for USE of Test Mode Exiting the Test ModeSelecting the Test Mode GroupFunctions of Other Buttons Operating the Continuous Playback ModeNon-Volatile Memory Mode EEP Mode Test Mode Displays Section Electrical Adjustments Parts Replacement and AdjustmentPrecautions for Adjustments Precautions for Checking Laser Diode EmissinonPrecautions for USE of Optical PICK- UP KMS-260A Creating Continuously Recorded DiscChecks Prior to Repairs Temperature Compensation Offset CheckLaser Power Check Specified ValueFocus Bias Check Play Checking MO Error Rate CheckCD Error Rate Check Self-Recording/playback CheckLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment CD Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points Section Diagrams Circuit Boards LocationPB Digital out Block Diagrams BD SectionMDS-SD1 REC DigitalRECDigital Main SectionPBDigital out Waveforms For schematic diagramsFor printed wiring boards Display SectionPrinted Wiring Board BD Section Semiconductor LocationSchematic Diagram BD 1/2 Section Schematic Diagram BD 2/2 Section Schematic Diagram Main 1/2 Section Schematic Diagram Main 2/2 Section Printed Wiring Board Main Section Schematic Diagram Panel Section Printed Wiring Board Panel Section Schematic Diagram Connector Section Printed Wiring Board Connector Section System Control To HCD-SD1MDS-SD1 IC Block Diagrams BD Section IC101IC301 LB1641 IC152 BH6511FS-E2Main Section IC201 UDA1341TS/N2 IC851 M5293L Connector Section IC774 P82B715TD.118IC822 M62016FP-E1 Pin No Pin Name Function IC PIN FunctionsIC101 CXA2523AR RF Amplifier BD Board IC701 M30610MC-A01FP System Control ∝CON Main Board CHAK-IN Section Exploded Views Case and Back Panel SectionPanel SW Board FL901 1-517-804-11 Indicator TUBE, FluorescentFront Panel Section 67 A-4724-619-A Panel BOARD, Complete209 4-988-466-21 Spring ELECTROSTATIC, Leaf Mechanism Deck Section MDM-5AInsulator F Motor ASSY, Sled Base Unit Section MBU-5AHEAD, Over Light Section Electrical Parts List Connector Connector Encoder Main Main FILTER, Line InductorLine Filter FeritePanel Panel SW MANUAL, Instruction CHINESESP,HK Hardware List Accessories & Packing Materials FILTER, Clamp Ferrite CoreMANUAL, Instruction English Screw +BSony Corporation
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