Sony MDS-SD1 Checks Prior to Repairs, Temperature Compensation Offset Check, Laser Power Check

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5-6. CHECKS PRIOR TO REPAIRS

These checks are performed before replacing parts according to “approximate specifications” to determine the faulty locations. For details, refer to “Checks Prior to Parts Replacement and Adjustments” (See page 8).

5-6-1. Temperature Compensation Offset Check

When performing adjustments, set the internal temperature and room temperature to 22 to 28 C.

Checking Procedure:

1.Rotate the –˜+ knob to display “TEMP CHECK”.

2.Press the ENTER/YES button.

3.“T=@@(##) [OK]” should be displayed. If “T=@@ (##) [NG]” is displayed, it means that the results are bad.

(@@ indicates the current value set, and ## indicates the value written in the non-volatile memory.)

5-6-2. Laser Power Check

Before checking, check the IOP value of the optical pick-up. (Refer to 5-8. Recording and Displaying IOP Information.)

Connection :

Laser power meter

Optical pick-up objective lens

Digital volt meter

BD board

CN110 pin 5 (I+3V)

CN110 pin 4 (IOP)

Checking Procedure:

1.Set the laser power meter on the objective lens of the optical pick-up. (When it cannot be set properly, press the 0/≠ button or )/± button to move the optical pick-up.)

Connect the digital volt meter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP).

2.Then, rotate the –˜+ knob and display “LDPWR CHECK”.

3.Press the ENTER/YES button once and display “LD 0.9 mW $

”. Check that the reading of the laser power meter become 0.84 to 0.92 mW.

4.Press the ENTER/YES button once more and display “LD 7.0 mW $ ”. Check that the reading the laser power meter and digital volt meter satisfy the specified value.

Specified Value :

Laser power meter reading : 7.0 ± 0.2 mW

Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

KMS260A

(For details of the method for checking

27X40

this value, refer to “5-8. Recording and

Displaying IOP Information”.)

B0825

 

 

 

N

 

Iop = 82.5 mA in this case

Iop (mA) = Digital voltmeter reading (mV)/1 (Ω)

5. Press the MENU/NO button and display “LDPWR CHECK” and stop the laser emission.

(The MENU/NO button is effective at all times to stop the laser emission.)

Note 1: After step 4, each time the ENTER/YES button is pressed,

the display will be switched between “LD 0.7 mW $ ”,

“LD 6.2 mW $ ”, and “LD Wp $ ”. Nothing needs to be performed here.

5-6-3. Traverse Check

Connection :

Oscilloscope

BD board

CN110 pin 3 (TE)

CN110 pin 1 (VC)

V : 0.5 V/div

H : 10 ms/div

Input : DC mode

Checking Procedure:

1.Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board.

2.Load a disc (any available on the market). (Refer to Note 1.)

3.Press the )/± button and move the optical pick-up out- side the pit.

4.Rotate the –˜+ knob and display “EF MO CHECK”.

5.Press the ENTER/YES button and display “EFB = MO-R”. (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)

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

(Read power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

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

7.Press the ENTER/YES button and display “EFB = MO-W”.

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

(Write power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

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

9.Press the ENTER/YES button display “EFB = MO-P”. Then, the optical pick-up moves to the pit area automatically and servo is imposed.

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Contents MDS-JE520 SpecificationsMDM-5A MBU-5ASELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Specification Label Flexible Circuit Board RepairingParts No Disassembly Table of ContentsDiagrams Exploded ViewsJIG for Checking BD Board Waveform Section Servicing NoteRecord Precedure Criteria for Determination Measure if unsatisfactory Checks Prior to Parts Replacement and AdjustmentsMain Board Component Side Forced ResetFluorescent Indicator Tube and Mechanism Deck Cleaning of Objective Lens of Optical PickupFluorescent Indicator TUBE, LED Complete Lighting Check Attaching the Glass AssemblyServicing Position Higher Bits Lower Bits Hexa Retry Cause Display ModeCause of Retry Occurring conditions BinaryHigher Bits Lower Bits Hexa Details Bit When BinaryHexadecimal Binary Front Panel Location of Parts and Controls Section GeneralGlass Assy Section DisassemblyFront Panel Base Unit and BD Board Slider CAMSW Board and Loading Motor M103 Precautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeGroup Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeFunctions of Other Buttons Test Mode Displays Parts Replacement and Adjustment Section Electrical AdjustmentsPrecautions for USE of Optical PICK- UP KMS-260A Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Creating Continuously Recorded DiscLaser Power Check Temperature Compensation Offset CheckChecks Prior to Repairs Specified ValueCD Error Rate Check Play Checking MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment Auto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points Circuit Boards Location Section DiagramsMDS-SD1 Block Diagrams BD SectionPB Digital out REC DigitalPBDigital out Main SectionRECDigital For printed wiring boards For schematic diagramsWaveforms Display SectionSemiconductor Location Printed Wiring Board BD SectionSchematic 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 System Control To HCD-SD1 Printed Wiring Board Connector SectionMDS-SD1 BD Section IC101 IC Block DiagramsMain Section IC201 UDA1341TS/N2 IC152 BH6511FS-E2IC301 LB1641 IC822 M62016FP-E1 Connector Section IC774 P82B715TD.118IC851 M5293L IC101 CXA2523AR RF Amplifier BD Board IC PIN FunctionsPin No Pin Name Function IC701 M30610MC-A01FP System Control ∝CON Main Board CHAK-IN Case and Back Panel Section Section Exploded ViewsFront Panel Section FL901 1-517-804-11 Indicator TUBE, FluorescentPanel SW Board 67 A-4724-619-A Panel BOARD, CompleteInsulator F Mechanism Deck Section MDM-5A209 4-988-466-21 Spring ELECTROSTATIC, Leaf HEAD, Over Light Base Unit Section MBU-5AMotor ASSY, Sled Section Electrical Parts List Connector Connector Encoder Main Main Line Filter InductorFILTER, Line FeritePanel Panel SW MANUAL, Instruction English Accessories & Packing Materials FILTER, Clamp Ferrite CoreMANUAL, Instruction CHINESESP,HK Hardware List Screw +BSony Corporation
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