Sony MDS-PC2 service manual Traverse Adjustment, Optical pick-up label

Page 26

6. Press the = , + buttons so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ^ “PRO-

GRAM” button and save it.

Note : Do not perform the emission with 7.0 mW more than 15 seconds continuously.

7.Then, press the + button and display “PWR CHECK”.

8.Press the ^ “PROGRAM” button once and display “0.9 mW*** $ ”. Check that the reading of the laser power meter become 0.85 to 0.91 mW. (*** means IOP value)

9.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.

Note down the digital voltmeter reading value.

Specified Value :

Laser power meter reading : 7.0 ± 0.1 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)

10. 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.)

11. Press the + button to display “Iop.Write”.

12. Press the ^ “PROGRAM” button. When the display be- comes Ref=@@@.@ (@ is an arbitrary number), press the ^

“PROGRAM” button to display “Measu=@@@.@” (@ is an arbitrary number).

13. The numbers which can be changed will blink. Input the Iop value noted down at step 9.

To select the number : Press the = , + buttons.

To select the digit : Press the r“PROGRAM” buttan

14. When the ^ “PROGRAM” button is pressed, “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.

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.

5-11. TRAVERSE ADJUSTMENT

Connection :

Oscilloscope

BD board

CN110 pin 3 (TE)

CN110 pin 1 (VC)

V : 0.5 V/div

H : 10 ms/div

Input : DC mode

Adjusting 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 ADJUST”.

5.Press the + button and display “EFB = MO-R”.

(Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)

6.Press the + button so that the waveform of the oscilloscope becomes the specified value.

(When the =, + buttons is pressed, the of “EFB= ” changes and the waveform changes.) In this adjustment, wave- form varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Read power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

7.Press the ^ “PROGRAM” button and save the result of ad-

justment to the non-volatile memory (“EFB = SAVE” will be

displayed for a moment. Then “EFB = MO-W” will be dis- played).

8.Press the = , + buttons so that the waveform of the oscilloscope becomes the specified value.

(When the =, + buttons is pressed, the of “EFB- ” changes and the waveform changes.) In this adjustment, wave- form varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Write power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

9.Press the ^ “PROGRAM” button, and save the adjustment

results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

10.“EFB = MO-P”. will be displayed.

The optical pick-up moves to the pit area automatically and servo is imposed.

26

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Contents Specifications MDM-5AProgram SELF-DIAGNOSIS FunctionInput Items of Error History Mode Items and Contents Flexible Circuit Board Repairing Parts NoDiagrams Table of ContentsDisassembly Exploded ViewsIOP Section Servicing NoteJIG for Checking BD Board Waveform TEORecord 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 Cause of Retry Occurring conditions Retry Cause Display ModeHigher Bits Lower Bits Hexa Bit BinaryHexadecimal Binary Bit When BinaryHigher Bits Lower Bits Hexa Details Section General Front PanelMD Mechanism Section DisassemblyCase and Front Panel Slider CAM Base Unit MBU-5A 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 GroupMID Operating the Continuous Playback ModeNon-Volatile Memory Mode EEP Mode OUTTest Mode Displays Functions of Other ButtonsMeanings of Other 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 EjectLaser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjutment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment 6EJECTCD 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 BD Board Side BSection Diagrams Circuit Boards LocationPB Digital out Block Diagram BD SectionMDS-PC2 REC DigitalMain Section LD-LOVOWaveforms Panel SectionPrinted Wiring Board BD Section See page 30 for Circuit Boards LocationSchematic 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 Printed Wiring Board Panel Section Main BoardSchematic Diagram Power Section Printed Wiring Board Power Section Main Board BD BoardBD section IC101 CXA2523AR Schematic Diagram BD Switch Section IC Block DiagramPrinted Wiring Board BD Switch Section IC121 CXD2654R IC152 BH6511FS-E2Main section IC301 UDA1341TS/N2 IC441 LB1830MPin No Pin Name Function IC PIN FunctionsIC101 RF Amplifier CXA2523AR BD board MNT2 Xbusy MNT0 FOKMNT1 Shck MNT3 SlocAsyi MvciAsyo AvddFrdr TfdrFfdr FS4IC501 System Control M30620MC-406FP Main board REC/PB OPT SEL Mode SELPB-P SDACabinet Section CORD, Power UKSection Exploded Views 509 4-988-466-21 Spring ELECTROSTATIC, Leaf Mechanism Section MDM-5AInsulator F 526 A-4680-417-A Holder Complete AssyMotor ASSY, Sled Base Unit Section MBU-5AHEAD, Over Light Back UP Section Electrical Parts List Main Ground Terminal CONNECTOR, FFC 15PElect Ferrite BeadMain Panel PLUG, Connector 6PPIN, Connector 2P VibratorPanel Power Power SW 928-916-11

MDS-PC2 specifications

The Sony MDS-PC2 is a compact yet powerful digital MiniDisc recorder that was designed to bring studio-quality recording capabilities to the consumer level. Launched in the late 1990s, this device was particularly notable for its versatility and advanced audio technologies, making it a favorite among audiophiles and home studio enthusiasts alike.

One of the standout features of the MDS-PC2 is its ability to record and playback audio with exceptional clarity. It utilizes the MiniDisc format, which employs a magneto-optical technology that allows for higher-quality recordings compared to traditional cassette formats. The MDS-PC2 supports various audio bit rates, including standard Stereo at 292 kbps and long play modes, which double the recording time at the cost of some audio fidelity. This flexibility allows users to tailor their recording settings to their specific needs.

The MDS-PC2 features an intuitive interface, including an easy-to-read LCD display that shows vital information about the track, such as its name, length, and remaining recording time. The device is equipped with multiple input options, including optical and analog connections, facilitating seamless integration into any audio setup. The built-in digital signal processor (DSP) enhances the recording quality by minimizing background noise and distortion, providing a clean and crisp listening experience.

Another notable characteristic is the MDS-PC2's editing capabilities. Users can easily create custom playlists, erase tracks, and rearrange audio sequences with a few simple commands. The unit also supports fade-in and fade-out functionalities, allowing for smooth transitions between tracks. The flexibility in editing makes it a potent tool for podcasters, musicians, and anyone looking to produce high-quality audio content.

Portability is another key aspect of the Sony MDS-PC2. Its lightweight design and durable build make it easy to transport, catering to users who are frequently on the move. Battery operation options provide additional convenience for those who wish to use the recorder away from a power source.

In summary, the Sony MDS-PC2 combines innovative technology with user-friendly features, making it an excellent choice for anyone seeking an efficient and high-quality MiniDisc recorder. Its capability to produce superior audio recordings, coupled with its adaptability and portability, has solidified its place as an essential tool for audio recording and playback in various settings.
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