Sony MDS-PC2 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.Press the + button to display “TEMP CHECK”.

2.Press the ^“PROGRAM” 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 =“PRO-

GRAM” button or + “PROGRAM” 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, press the + button and display “LDPWR CHECK” .

3.Press the ^ “PROGRAM” button once and display “0.9 mW*** $ ”. Check that the reading of the laser power meter become 0.84 to 0.92 mW. (*** means IOP value)

4.Press the ^ “PROGRAM” button once more and display “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 p “PROGRAM” button and display “LDPWR CHECK” and stop the laser emission.

(The p “PROGRAM” button is effective at all times to stop the laser emission.)

Note 1: After step 4, each time the ^ “PROGRAM” button is pressed, the display will be switched between “0.7 mW***

$ ”, “6.2 mW*** $ ”, and “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 +“PROGRAM” button and move the optical pick- up outside the pit.

4.Press the + button and display “EF MO CHECK”.

5. Press the ^ “PROGRAM” 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 press the = , + but- tons.

(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 ^ “PROGRAM” button and display “EFB = MO-W”.

8.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not press the = , + but- tons..

(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 ^ “PROGRAM” 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 MDM-5A SpecificationsProgram SELF-DIAGNOSIS FunctionInput Items of Error History Mode Items and Contents Parts No Flexible Circuit Board RepairingExploded Views Table of ContentsDisassembly DiagramsTEO Section Servicing NoteJIG for Checking BD Board Waveform IOPRecord Precedure REC/PLAY Checks Prior to Parts Replacement and AdjustmentsCriteria for Determination Measure if unsatisfactory Power Board Component Side Forced ResetFluorescent Display Tube ALL Lighting and KEY Check Mode Bit Binary Retry Cause Display ModeHigher Bits Lower Bits Hexa Cause of Retry Occurring conditionsHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Front Panel Section GeneralMD Mechanism Section DisassemblyCase and Front Panel Base Unit MBU-5A and BD Board Slider CAMSW Board and Loading Motor M103 Exiting the Test Mode Section Test ModePrecautions for USE of Test Mode Setting the Test ModeGroup Selecting the Test ModeOUT Operating the Continuous Playback ModeNon-Volatile Memory Mode EEP Mode MIDFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays Parts Replacement and Adjustment Section Electrical AdjustmentsCreating Continuously Recorded Disc Precautions for Checking Laser Diode EmissinonPrecautions for USE of Optical PICK- UP KMS-260A Precautions for AdjustmentsSpecified Value Temperature Compensation Offset CheckLaser Power Check Checks Prior to RepairsEject 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 6EJECT Focus Bias AdjustmentMO Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment CD Auto Gain Control Output Level AdjustmentBD Board Side B Adjusting Points and Connecting PointsCircuit Boards Location Section DiagramsREC Digital Block Diagram BD SectionMDS-PC2 PB Digital outLD-LOVO Main SectionPanel Section WaveformsSee page 30 for Circuit Boards Location Printed Wiring Board BD SectionSchematic Diagram BD 1/2 Section Schematic Diagram BD 2/2 Section Schematic Diagram Main 1/2 Section Board Schematic Diagram Main 2/2 SectionPanel BD Board Panel Printed Wiring Board Main SectionPower Schematic Diagram Panel Section Main Board Printed Wiring Board Panel SectionSchematic Diagram Power Section Main Board BD Board Printed Wiring Board Power SectionBD section IC101 CXA2523AR Schematic Diagram BD Switch Section IC Block DiagramPrinted Wiring Board BD Switch Section IC152 BH6511FS-E2 IC121 CXD2654RIC441 LB1830M Main section IC301 UDA1341TS/N2Pin No Pin Name Function IC PIN FunctionsIC101 RF Amplifier CXA2523AR BD board MNT3 Sloc MNT0 FOKMNT1 Shck MNT2 XbusyAvdd MvciAsyo AsyiFS4 TfdrFfdr FrdrIC501 System Control M30620MC-406FP Main board SDA OPT SEL Mode SELPB-P REC/PBCabinet Section CORD, Power UKSection Exploded Views 526 A-4680-417-A Holder Complete Assy Mechanism Section MDM-5AInsulator F 509 4-988-466-21 Spring ELECTROSTATIC, LeafMotor ASSY, Sled Base Unit Section MBU-5AHEAD, Over Light Back UP Section Electrical Parts List Main Ferrite Bead CONNECTOR, FFC 15PElect Ground TerminalVibrator PLUG, Connector 6PPIN, Connector 2P Main PanelPanel Power Power SW 928-916-11

MDS-PC2 specifications

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