Sony MDS-S50 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

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MDS-JE470

5-14. ERROR RATE CHECK

5-14-1. 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 “C = AD = ”.

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

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

5-14-2. 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 remove the test disc.

5-15. 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 twice 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 ADR, 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 continuously recorded disc.

Note 1 : If the C error and ADER are above other than the speci- fied value at points a (step 8. in the above) or b (step 7. in the above), the focus bias adjustment may not have been carried out properly. Adjust perform the beginning again.

5-16. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the Optical pick-up is re- placed.

If the adjustment results becomes “Adjust NG!”, the Optical pick- up may be faulty or the servo system circuits may be abnormal.

5-16-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the check disc (MD) TDYS-1.

2.Rotate the lAMS L knob to display “AG Set (CD)”.

3.When the YES button is pressed, the adjustment will be performed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (CD)”.

4.Press the AEJECT button to remove the disc.

5-16-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the reference disc (MDW-74/GA-1) for recording.

2.Rotate the lAMS L knob to display “AG Set (MO)”.

3.When the YES button is pressed, the adjustment will be performed automatically.

“Complete!!” will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to “AG Set (MO)”.

4.Press the AEJECT button to remove the disc.

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Contents Specifications 873-891-11SELF-DIAGNOSIS Function MDS-JE470Three- 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 DiscriminationForced Reset Checks Prior to Parts Replacement and AdjustmentsMain Board Component Side Retry Cause Display Mode Bit BinaryHigher Bits Lower Bits Hexa Details Bit When BinaryHexadecimal 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 InformationParts Replacement and Adjustment MDS-JE470 Section Electrical AdjustmentsCheck before replacement Adjustment flow Precautions for USE of Optical PICK- UP KMS-260B/260E Precautions for Checking Laser Diode EmissionPrecautions 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 CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser 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 BoardIC171 Block Diagrams BD SectionIC190 IC360 2/2 Main SectionIC1 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 IC101 CXA2523AR RF Amplifier BD Board IC PIN Function DescriptionPin 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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