Sony MDS-S50 specifications Focus Bias Check, Play Check MO Error Rate Check, CD Error Rate Check

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MDS-JE470

16.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the lAMS L knob.

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

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

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

18.Press the AEJECT 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

CN105 pin 4 (TE)

10pF

CN105 pin 6

(VC)

 

5-6-7. Focus Bias Check

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button and display “CPLAY1 MID”.

4. Press the

MENU/NO

button when “C =

AD = ” is

displayed.

 

5.Rotate the lAMS L knob and display “FBIAS CHECK”.

6.Press the YES button and display “ / c = ”.

The first four digits indicate the C error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value.

Check that the C error is below 20 and ADER is below 2.

7.Press the YES button and display “ / b = ”. Check that the C error is below 100 and ADER is below 2.

8.Press the YES button and display “ / a = ”. Check that the C error is below 100 and ADER is below 2.

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

5-6-8. C PLAY Check

MO Error Rate Check

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button and display “CPLAY1 MID”.

4.The display changes to “C = AD = ”.

5.If the C error rate is below 20, check that ADER is 00.

6.Press the MENU/NO button, stop playback, press the AEJECT button, and test disc.

CD Error Rate Check

Checking Procedure :

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

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button twice and display “CPLAY1 MID”.

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

5.Check that the C1 error rate is below 20.

6.Press the MENU/NO button, stop playback, press the AEJECT button, and the test disc.

5-6-9. 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 test disc (MDW-74/GA-1) into the unit.

2.Rotate the lAMS L knob to display “CREC1 MODE”.

3.Press the YES button to display the “CREC1 MID”.

4.When recording starts, “ REC ” is displayed, this becomes “CREC 1 (@@@@)” (@@@@ is the address), and recording starts.

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

6.Rotate the lAMS L knob to display “C PLAY1 MODE”.

7.Press the YES button to display “C PLAY1 MID”.

8.“C = AD = ” will be displayed.

9.Check that the C error becomes below 20 and the AD error below 2.

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

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Contents Specifications 873-891-11MDS-JE470 SELF-DIAGNOSIS FunctionThree- or five Digit code Cause/Remedy Message Items of Error History Mode Items and Contents Diagrams Table of ContentsDisassembly Exploded ViewsFlexible Circuit Board Repairing MDS-JE470 Section Service NotesSafety CHECK-OUT LeakageJIG for Checking BD Board Waveform IOPRecord Precedure KSN-260E Optical PICK-UP Block Type DiscriminationChecks Prior to Parts Replacement and Adjustments Forced ResetMain Board Component Side Retry Cause Display Mode Bit BinaryBit When Binary Higher Bits Lower Bits Hexa DetailsHexadecimal Binary MDS-JE470 Section General Button DescriptionsMDS-JE470 Section Disassembly Disassembly FlowFront Panel Section Main Board PT BOARD, VOL-SEL Board SP modelMechanism Deck Section MDM-7A Over Light Head HR901, BD BoardHolder Assy Loading Motor Assy M103Sled Motor Assy M102, Slider Optical PICK-UPSpindle Moter Assy M101 Setting the Test Mode MDS-JE470 Section Test ModePrecautions for USE of Test Mode Exiting the Test ModeSelecting the Test Mode DisplayOperating the Continuous Playback Mode MENU/NOError rate display Test Mode DisplaysMode display Functions of Other ButtonsAutomatic SELF-DIAGNOSIS Function When Memory NG is DisplayedMeanings of Other Displays InformationMDS-JE470 Section Electrical Adjustments Parts Replacement and AdjustmentCheck before replacement Adjustment flow Precautions for Checking Laser Diode Emission Precautions for USE of Optical PICK- UP KMS-260B/260EPrecautions for Adjustments Using the Continuously Recorded Disc Checks Prior to RepairsTraverse Check Auto CheckOther Checks Traverse WaveformFocus Bias Check Play Check MO Error Rate CheckCD Error Rate Check Self-Recording/playback CheckInitial Setting of Adjustment Value Temperature Compensation Offset AdjutmentLaser Power Adjustment Traverse Adjustment Iop NV SaveFocus 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 MDS-JE470 Section Diagrams Circuit Boards LocationBD Board For schematic diagramsFor printed wiring boards Main BoardBlock Diagrams BD Section IC171IC190 Main Section IC360 2/2IC1 2/2 SemiconductorOVER SemiconductorBoard Board Main Display Board Schematic Diagram Main /2 See page 51 for IC Block DiagramsIC1 KEY-SW Board Schematic Diagram Display Section Indicator TubePT Board 230VSchematic Diagram Power Section IC Block Diagrams IC101 CXA2523AR BD BoardIC500 AK4524 Main Board IC PIN Function Description IC101 CXA2523AR RF Amplifier BD BoardPin No Pin Name Description Pin No Pin Name Desription SqsyMvci Abbreviation EFM Eight to Fourteen Modulation IC1 M30803MG-107FP System Control Main Board ADA. Latch STB Section Exploded Views Chassis SectionFL750 Mechanism MDM-7A M101 Electrical Parts List CoilsMetal Chip Display MDS-JE470 KEY-SW MainMDS-JE470 Main CN2TC7WHU04FUTE12R MDS-JE470 Main VOL-SEL Screw +KTP 2X6 TYPE2 NON-SLITMDS-JE470 MDS-JE470 Revision History

MDS-S50 specifications

The Sony MDS-S50 is a pinnacle of MiniDisc technology, offering audiophiles a compact and reliable way to enjoy high-quality audio. Launched in the early 2000s, it epitomizes the innovation that Sony was known for during this period, combining functionality with sleek design.

One of the primary features of the MDS-S50 is its ability to record in SP (Standard Play) mode, which delivers high-resolution audio at 64 kbps, and LP (Long Play) mode for extended recording times. This flexibility makes it suitable for various listening preferences, whether for critical listening or casual playback during everyday activities. The device harnesses the precision of digital audio encoding, ensuring minimal loss of sound quality.

The MDS-S50 stands out with its direct digital recording capabilities. By connecting to external audio sources via optical or coaxial digital inputs, users can preserve the integrity of the original sound. This feature is particularly appealing for those who want to capture live recordings or transfer vinyl records and CDs to the MiniDisc format without degradation.

The inclusion of a user-friendly interface, with an intuitive remote control and well-organized menu systems, enhances the experience for users. The display panel gives clear information on track titles, remaining recording time, and other essential details, allowing for seamless navigation through complex playlists or recording options.

Another notable technology in the MDS-S50 is the ATRAC (Adaptive Transform Acoustic Coding) compression algorithm, developed by Sony. This proprietary encoding format optimizes sound quality while significantly reducing file sizes. The result is a perfect balance between audio fidelity and efficient storage, which was a major advantage during the era of burgeoning digital music.

Furthermore, the MDS-S50 boasts a durable build quality, designed to withstand transport and everyday use. Its compact size, combined with lightweight materials, allows users to take it on the go while not compromising on audio quality.

Ultimately, the Sony MDS-S50 remains a beloved device among music enthusiasts. With its combination of high-quality recording capabilities, advanced digital encoding technology, and user-friendly features, it represents a unique chapter in the evolution of portable audio. Whether used as a standalone player or part of a larger audio setup, it delivers a level of performance that still resonates with those who appreciate the art of music.
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