Sony MDS-S50 specifications Focus Bias Adjustment

Page 33

11.Rotate the lAMS L knob until 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

12.Press the YES button, and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

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

13.Press the AEJECT button and remove the disc.

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

15.Roteto lAMS L knob and display “EF CD ADJUS”.

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

17.Rotate the lAMS L knob 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 YES button, display “EFB = SAVE” for a mo- ment and save the adjustment results in the non-volatile memory. Next “EF CD ADJUST” will be displayed.

19.Press the A 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

CN105 pin 4 (TE)

10pF

CN105 pin 6

(VC)

 

MDS-JE470

5-13. FOCUS BIAS ADJUSTMENT

Adjusting Procedure :

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

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 l AMS L knob and display “FBIAS AD- JUST”.

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

The first four digits indicate the C error rate, the two digits after

[/]indicate ADER, and the 2 digits after [a =] indicate the focus bias value.

7.Rotate the lAMS L knob in the clockwise direction and find the focus bias value at which the C error rate becomes 220 (Refer to Note 2).

8.Press the YES button and display “ / b = ”.

9.Rotate the lAMS L knob in the counterclockwise di- rection and find the focus bias value at which the C error rate becomes 220.

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

11.Check that the C error rate is below 20 and ADER is 00. Then press the YES button.

12.

If the “(

” in “ -

- ( ” is above 20, press the

YES

 

button.

 

 

 

 

 

 

 

If below 20, press the

 

MENU/NO

button and repeat the

 

adjustment from step 2.

 

 

 

 

13.

Press the

AEJECT

button to remove the test disc.

Note 1 : The relation between the C 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 C error rate changes, perform the adjustment using the average vale.

Cerror

220

b

c

a

Focus bias value

 

 

 

(F. BIAS)

33

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Contents 873-891-11 SpecificationsMDS-JE470 SELF-DIAGNOSIS FunctionThree- or five Digit code Cause/Remedy Message Items of Error History Mode Items and Contents Disassembly Table of ContentsDiagrams Exploded ViewsSafety CHECK-OUT MDS-JE470 Section Service NotesFlexible Circuit Board Repairing LeakageIOP JIG for Checking BD Board WaveformRecord Precedure Optical PICK-UP Block Type Discrimination KSN-260EChecks Prior to Parts Replacement and Adjustments Forced ResetMain Board Component Side Bit Binary Retry Cause Display ModeBit When Binary Higher Bits Lower Bits Hexa DetailsHexadecimal Binary Button Descriptions MDS-JE470 Section GeneralDisassembly Flow MDS-JE470 Section DisassemblyFront Panel Section PT BOARD, VOL-SEL Board SP model Main BoardOver Light Head HR901, BD Board Mechanism Deck Section MDM-7ALoading Motor Assy M103 Holder AssyOptical PICK-UP Sled Motor Assy M102, SliderSpindle Moter Assy M101 Precautions for USE of Test Mode MDS-JE470 Section Test ModeSetting the Test Mode Exiting the Test ModeDisplay Selecting the Test ModeMENU/NO Operating the Continuous Playback ModeMode display Test Mode DisplaysError rate display Functions of Other ButtonsMeanings of Other Displays When Memory NG is DisplayedAutomatic SELF-DIAGNOSIS Function 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 Checks Prior to Repairs Using the Continuously Recorded DiscOther Checks Auto CheckTraverse Check Traverse WaveformCD Error Rate Check Play Check MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckInitial Setting of Adjustment Value Temperature Compensation Offset AdjutmentLaser Power Adjustment Iop NV Save Traverse AdjustmentFocus Bias Adjustment Auto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points Circuit Boards Location MDS-JE470 Section DiagramsFor printed wiring boards For schematic diagramsBD Board Main BoardBlock Diagrams BD Section IC171IC190 Main Section IC360 2/2IC1 2/2 Semiconductor SemiconductorOVERBoard Board Main Display Board See page 51 for IC Block Diagrams Schematic Diagram Main /2IC1 KEY-SW Board Indicator Tube Schematic Diagram Display Section230V PT BoardSchematic Diagram Power Section IC101 CXA2523AR BD Board IC Block DiagramsIC500 AK4524 Main Board IC PIN Function Description IC101 CXA2523AR RF Amplifier BD BoardPin No Pin Name Description Sqsy Pin No Pin Name DesriptionMvci Abbreviation EFM Eight to Fourteen Modulation IC1 M30803MG-107FP System Control Main Board ADA. Latch STB Chassis Section Section Exploded ViewsFL750 Mechanism MDM-7A M101 Coils Electrical Parts ListMetal Chip MDS-JE470 KEY-SW Main DisplayCN2 MDS-JE470 MainTC7WHU04FUTE12R Screw +KTP 2X6 TYPE2 NON-SLIT MDS-JE470 Main VOL-SELMDS-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.

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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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