Sony MDS-PC2 service manual Focus Bias Adjustment, 6EJECT

Page 27

11.Press the =, + buttons until the waveform of the oscil- loscope moves closer to the specified value.

In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Traverse Waveform)

A

VC

B

Specification A = B

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

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

Next “EF MO ADJUST” is displayed. The disc stops rotating automatically.

13.Press the 6 (EJECT) button and remove the disc.

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

15.Press + button and display “EF CD ADJUST”.

16. Press the ^ “PROGRAM” button and display “EFB = CD”. Servo is imposed automatically.

17.Press the = , + buttons so that the waveform of the oscilloscope moves closer to the specified value.

In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Traverse Waveform)

A

VC

B

Specification A = B

 

18. Press the ^“PROGRAM” button, display “EFB =

SAVE”

for a moment and save the adjustment results in the non-vola- tile memory.

Next “EF CD ADJUST” will be displayed.

19.Press the 6(EJECT) 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)

 

5-12. FOCUS BIAS ADJUSTMENT

Adjusting Procedure :

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

2.Press the + button and display “CPLAY MODE”.

3.Press the ^“PROGRAM” button and display “CPLAY MID”.

4.

Press the

p“PROGRAM”

button when “C1 =

AD =

”

 

is displayed.

 

 

5.

Press the

 

 

button and display “FBIAS ADJUST”.

 

+

 

6.

Press the

 

 

button and display “

/

a =

p “PROGRAM”

 

”.

 

 

 

The first four digits indicate the C1 error rate, the two digits

 

after “/” indicate ADER, and the 2 digits after [a =] indicate the

 

focus bias value.

 

 

7.Press the + button and find the focus bias value at which the C1 error rate becomes about 200 (Refer to Note 2).

8. Press the

^“PROGRAM”

button and display “

/ b =

”.

 

9.Press the = button direction and find the focus bias value at which the C1 error rate becomes about 200.

10.

Press the

 

^“PROGRAM”

button and display “

/

c =

 

”.

 

 

 

 

 

 

 

 

 

11.

Check that the C1 error rate is below 50 and ADER is 00. Then

 

press the

^ “PROGRAM”

button.

 

 

12.

If the “(

 

)” in “ -

- ( )” is above 20, press the

p

 

“PROGRAM”

button.

 

 

 

 

 

 

 

If below 20, press the

p “PROGRAM”

button and repeat the

 

adjustment from step 2.

 

 

13.

Press the

 

6(EJECT)

button to remove the test disc.

 

 

Note 1 : The relation between the C1 error and focus bias is as shown in the following figure. Find points a and b in the following figure using the above adjustment. The focal point position C is automatically calculated from points a and b.

Note 2 : As the C1 error rate changes, perform the adjustment us- ing the average vale.

C1 error

about 200

b

c

a

Focus bias value

 

 

 

(F. BIAS)

27

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Contents MDM-5A SpecificationsSELF-DIAGNOSIS Function InputProgram 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 Checks Prior to Parts Replacement and Adjustments Criteria for Determination Measure if unsatisfactoryREC/PLAY Forced Reset Fluorescent Display Tube ALL Lighting and KEY Check ModePower Board Component Side Bit Binary Retry Cause Display ModeHigher Bits Lower Bits Hexa Cause of Retry Occurring conditionsBit When Binary Higher Bits Lower Bits Hexa DetailsHexadecimal Binary Front Panel Section GeneralSection Disassembly Case and Front PanelMD Mechanism 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 Schematic Diagram Main 2/2 Section PanelBoard Printed Wiring Board Main Section PowerBD Board Panel Schematic Diagram Panel Section Main Board Printed Wiring Board Panel SectionSchematic Diagram Power Section Main Board BD Board Printed Wiring Board Power SectionSchematic Diagram BD Switch Section IC Block Diagram Printed Wiring Board BD Switch SectionBD section IC101 CXA2523AR IC152 BH6511FS-E2 IC121 CXD2654RIC441 LB1830M Main section IC301 UDA1341TS/N2IC PIN Functions IC101 RF Amplifier CXA2523AR BD boardPin No Pin Name Function MNT3 Sloc MNT0 FOKMNT1 Shck MNT2 XbusyAvdd MvciAsyo AsyiFS4 TfdrFfdr FrdrIC501 System Control M30620MC-406FP Main board SDA OPT SEL Mode SELPB-P REC/PBCORD, Power UK Section Exploded ViewsCabinet Section 526 A-4680-417-A Holder Complete Assy Mechanism Section MDM-5AInsulator F 509 4-988-466-21 Spring ELECTROSTATIC, LeafBase Unit Section MBU-5A HEAD, Over LightMotor ASSY, Sled 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

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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