Sony Singapore model, Hong Kong model, 4-216-349-5 service manual Focus Bias Adjustment, Yes

Page 25

11.Rotate the AMS 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 ADJUST” is displayed. The disc stops rotating automatically.

13.Press the § button and remove the disc.

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

15.Roteto AMS knob and display “EF CD ADJUST”.

16. Press the

YES

button and display “EFB =

CD”. Servo is

imposed automatically.

 

17.Rotate the AMS 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

 

button, display “EFB =

SAVE” for a mo-

YES

 

ment and save the adjustment results in the non-volatile memory.

 

Next “EF CD ADJUST” will be displayed.

 

19.

Press the § 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.Rotate the AMS knob and display “CPLAY MODE”.

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

4. Press the

MENU/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 MENU/NO button and repeat the adjustment from step 2.

13.Press the § 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

220

b

c

a

Focus bias value

 

 

 

(F. BIAS)

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Contents MDS-JE330 SpecificationsSELF-DIAGNOSIS Function Items of Error History Mode Items and Contents Varnig Flexible Circuit Board RepairingDisassembly Table of ContentsDiagrams Exploded ViewsJIG for Checking BD Board Waveform Section Servicing NoteIOP TEORecord Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsCriteria for Determination Measure if unsatisfactory REC/PLAYBit Binary Retry Cause Display ModeHigher Bits Lower Bits Hexa Details Bit When BinaryHexadecimal Binary Location of Parts and Controls Section GeneralFront Panel Case and Front Panel Section DisassemblySlider CAM SW Board and Loading Motor M103 Base Unit MBU-5A and BD BoardPrecautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeGroup Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID OUTFunctions of Other Buttons Test Mode DisplaysMeanings of Other Displays Parts Replacement and Adjustment Section Electrical AdjustmentsPrecautions for USE of Optical PICK- UP KMS-260A Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Creating Continuously Recorded DiscLaser Power Check Temperature Compensation Offset CheckChecks Prior to Repairs Specified Value CD Error Rate Check Play Checking MO Error Rate Check Focus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment Focus 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 Section DiagramsMDS-JE330 Block Diagrams BD SectionLD-LOVO Main SectionFor printed wiring boards For schematic diagramsWaveforms Display SectionSemiconductor 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 Printed Wiring Board Main Section Printed Wiring Board Panel Section Schematic Diagram Panel Section Printed Wiring Board BD Switch Section Schematic Diagram BD Switch Section IC Block DiagramsBD Section IC101 IC152 BH6511FS-E2 IC121 CXD2654RIC381 M5218AL IC441 LB1641 Main section IC301 UDA1341TS/N2IC406 M62016L IC101 RF Amplifier CXA2523AR BD board IC PIN FunctionsPin No Pin Name Function MNT1 Shck MNT0 FOKMNT2 Xbusy MNT3 SlocAsyo MvciAsyi AvddFfdr TfdrFrdr FS4IC501 System Control M30620MC-400FP Main board PB-P OPT DEL OPT SEL Mode SELREC/PB SDACase and Back Panel Section Section Exploded Views6162 Front Panel Section225 226 206 205 Mechanism Section MDM-5A251 252 Base Unit Section MBU-5AResistors Section Electrical Parts ListDisplay Display KEY SW Main PIN, Connector 7P Inductor Vibrator MDS-JE330 Main SW VOL SEL
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