Sony MDS-JD320 service manual MDS-JE320, Focus Bias Adjustment, Error Rate Check, Focus Bias Check

Page 19

5-8. FOCUS BIAS ADJUSTMENT

Adjusting Method :

1.Load a continuously recorded disc (Refer to “5-4. Creating Continuously Recorded Disc”.).

2.Rotate the AMS knob and display “CPLAY MODE”.

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

4.Press the EDIT/NO button when “C1 = AD = ” is displayed.

5.Rotate the AMS knob and display “FBIAS ADJUST”.

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

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.Rotate the AMS knob in the clockwise direction and find the focus bias value at which the C1 error rate becomes 220 (Refer to Note 2).

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

9.Rotate the AMS knob in the counterclockwise direction and find the focus bias value at which the C1 error rate becomes 220.

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

11.Check that the C1 error rate is below 50 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 EDIT/NO button and repeat the adjustment from step 2.

13.Press the ¤EJECT button to remove the continuously recorded 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 using the average vale.

C1 error

220

Focus bias value (F. BIAS)

b

c

a

5-9. ERROR RATE CHECK

5-9-1. CD Error Rate Check

Checking Method :

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

2.Rotate the AMS knob and display “CPLAY MODE”.

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

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

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

6.Press the EDIT/NO button, stop playback, press the ¤EJECT button, and remove the test disc.

5-9-2. MO Error Rate Check

Checking Method :

1.Load a continuously recorded disc (Refer to “5-4. Creating Continuously Recorded Disc”.).

2.Rotate the AMS knob and display “CPLAY MODE”.

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

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

5.If the C1 error rate is below 50, check that ADER is 00.

6.Press the EDIT/NO button, stop playback, press the ¤EJECT button, and remove the continuously recorded disc.

5-10. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Method :

1.Load a continuously recorded disc (Refer to “5-4. Creating Continuously Recorded Disc”.).

2.Rotate the AMS knob and display “CPLAY MODE”.

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

4.Press the EDIT/NO button when “C1 = AD = ” is displayed.

5.Rotate the AMS knob and display “FBIAS CHECK”.

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

The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value.

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

7.Press the YES button and display “ / b = ”. Check that the C1 error is not below 220 and ADER is not above 00 every time.

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

Check that the C1 error is not below 220 and ADER is not above 00 every time.

9.Press the EDIT/NO button, next press the ¤EJECT button, and remove the continuously recorded disc.

Note 1 : If the C1 error and ADER are above 00 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.

MDS-JE320

5-11. ADJUSTING POINTS AND CONNETING POINTS

[BD BOARD] (SIDE A)

1

5 CN110

RF

NOTE

I + 3V

VC TEO IOP

CN101

D101

IC192

NOTE : It is useful to use the jig. for checking the waveform. (Refer to Servicing Note on page 4.)

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Contents MDM-3GC SpecificationsVarnig Flexible Circuit Board RepairingExploded Views Table of ContentsDisassembly DiagramsSelf-Diagnosis Function SELF-DIAGNOSIS FunctionMain Board Component Side Forced ResetSection Servicing Note JIG for Checking BD Board WaveformFluorescent Display Tube Signs Retry Cause Display ModeHexadecimal nBinary Conversion Table Location of Parts and Controls Section GeneralCase and Front Panel Assembly Section DisassemblyBracket T, L and R SUB Chassis BD BoardOver Write Head Shutter AssemblySlider Complete Assembly Section Test Mode MID Operating the Continuous Playback ModeOperating the Continuous Recording Mode Non-Volatile Memory ModeFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays Precautions for Adjustments Section Electrical AdjustmentsPrecautions for Checking Laser Diode Emissinon Precautions for USE of Optical PICK- UP KMS-260ALaser Power Adjustment Temperature Compensation Offset AdjutmentSpecified Value Traverse Waveform Traverse AdjustmentMDS-JE320 Focus Bias AdjustmentError Rate Check Adjusting Points and Conneting PointsMain MDS-JE320 Section DiagramsBlock Diagrams Optical PICK-UP BlockREC Main SectionFor printed wiring boards For schematic diagramsWaveform Location Printed Wiring Board BD SectionSemiconductor Schematic Diagram BD /2 See page 26 for Waveforms See page 49 for IC Block Diagrams Main Board Printed Wiring Board Main SectionSchematic Diagram Main /3 MDS-JE320 Schematic Diagram Main /3 Display Board Printed Wiring Board Display SectionEject SW Board Schematic Diagram Display Section Printed Wiring Board Switch Section Schematic Diagram Switch Section IC121 CXD2650R IC Block DiagramsBD section IC101 CXA2523R IC152 BH6511FS IC121 CXD2652ARIC307 CXD8607N IC171 XL24C01AFIC192 L88MS33T Main section IC301 LA9615IC311 LB1641 IC308 M5218AL IC309 LA5620 IC310 M5293LIC101 RF Amplifier CXA2523R Pin No Pin Name Function IC PIN FunctionsMNT3 Sloc MNT0 FOKMNT1 Shck MNT2 XbusyPin No Pin Name Function FS4 TfdrFfdr FrdrIC307 A/D, D/A converter CXD8607N Pin No Pin Name Function Lvss TEST2TEST3 LvddChuck Timer SWPower Down DaoutBUS OUT MNT2MNT3 LED0Dsel A, Dsel B DIG-RSTBeep DA-RSTMain Section Section Exploded ViewsButton Main Front Panel Section6059 Panel ASSY, Front US,CND209 208 Mechanism Deck MDM-3GC201 202 203 204 205 206 207253 254 259 252257 258 260 271 Section Electrical Parts List Inductor TC74ACT540FSInductor Chip ShortControl SW Display Eject SW Main Line Filter NJM78L06ANJM79L12A SN74HCU04ANMDS-JE320 Main

MDS-JD320 specifications

The Sony MDS-JD320 is a MiniDisc recorder that exemplifies the cutting-edge technology of the late 1990s and early 2000s. Designed for both amateur and professional audiophiles, it delivers superior sound quality and an array of features that enhance user experience and functionality. Key to its appeal is its remarkable sound reproduction capabilities, which are achieved through Sony's proprietary technologies, including the ATRAC (Adaptive Transform Acoustic Coding) compression format. This format allows for efficient audio storage without sacrificing sound fidelity, ensuring that each recording is as rich and dynamic as the original source.

One of the standout features of the MDS-JD320 is its ability to create, edit, and playback CDs and MiniDiscs with remarkable ease. Thanks to its digital optical input and output, users can connect the device to various audio sources, such as CD players or mixing boards, to make high-quality recordings. The device supports various recording modes, including long play, which enables users to extend their recording time without significant compromise on audio quality.

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In terms of connectivity, the MDS-JD320 features not only digital inputs and outputs but also analog connections, making it versatile for various setups. Additionally, the device includes extensive editing features, such as track splitting, combining, and renaming, empowering users to customize their recordings easily.

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With its powerful combination of advanced technologies, ease of use, and high-quality audio performance, the Sony MDS-JD320 remains a sought-after component for collectors and audiophiles alike, representing an enduring legacy in the field of portable digital media solutions.
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