Sony MDS-NT1 service manual Focus Bias Adjustment, ENTER/YES button

Page 33

7.Click the [ENTER/YES] and save the result of adjustment to the non-volatile memory (“EFB = SAVE” will be displayed for a moment. Then “EFB = MO-W” will be displayed).

8.Click the [JOG UP] or [JOG DOWN] so that the waveform of the oscilloscope becomes the specified value.

(When the [JOG UP] or [JOG DOWN] is clicked, the of “EFB= ” changes and the waveform changes.) In this ad- justment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Write power traverse adjustment)

Traverse Waveform

A

VC

B

Specification A = B

9.Click the [ENTER/YES], and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment)

10.“EFB = MO-P” will be displayed.

The optical pick-up moves to the pit area automatically and servo is imposed.

11.Click the [JOG UP] or [JOG DOWN] 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.Click the [ENTER/YES], and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

Next “EF MO ADJUST” (C07) is displayed. The disc stops rotating automatically.

13.Click the [EJECT] and take out the disc.

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

15.Click the [JOG UP] or [JOG DOWN] to display “EF CD ADJUST” (C08).

16.Click the [ENTER/YES] to display “EFB = CD”. Servo is imposed automatically.

17.Click the [JOG UP] or [JOG DOWN] 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

MDS-NT1

18.Click the [ENTER/YES], display “EFB = SAVE” for a mo- ment and save the adjustment results in the non-volatile memory.

Next “EF CD ADJUST” (C08) will be displayed.

19.Click the [EJECT] button and take out the disc (MD) TDYS- 1.

Adjustment Location: BD board (see page 35)

5-14. FOCUS BIAS ADJUSTMENT

Adjusting Procedure:

1.Load the continuously-recorded disc. (Refer to “5. USING THE CONTINUOUSLY RECORDED DISC”)

2.Click the [JOG UP] or [JOG DOWN] to display “CPLAY2 MODE” (C36).

3.Click the [ENTER/YES] to display “CPLAY2MID”.

4.Click the [MENU/NO] when “C = AD = ” is displayed.

5.Click the [JOG UP] or [JOG DOWN] to display “FBIAS ADJUST” (C09).

6.Click the [ENTER/YES] to 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.Click the [JOG UP] and find the focus bias value at which the C1 error rate becomes about 200 (refer to Note 2).

8.Click the [ENTER/YES] to display “ / b = ”.

9.Click the [JOG DOWN] and find the focus bias value at which the C1 error rate becomes about 200.

10.Click the [ENTER/YES] to display “ / c = ”.

11.Check that the C1 error rate is below 20 and ADER is 00. Then click the [ENTER/YES].

12.If the “( )” in “ - - ( )” is above 20, click the

[ENTER/YES] button.

If below 20, click the [MENU/NO] and repeat the adjustment from step 2.

13.Click the [EJECT] button and take out the 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 auto- matically calculated from points A and B.

Note 2: As the C1 error rate changes, perform the adjustment using the average vale.

C1 error

about 200

Focus bias value

BCA

33

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Contents MDS-NT1 SpecificationsMDS-NT1 SELF-DIAGNOSIS Function Playback Recording Cause/Remedy Indicator Green RedMDS-NT1 Items of Error History Mode Items and ContentsError Code Details of Error Table of Error CodesDisassembly Table of ContentsDiagrams SELF-DIAGNOSIS FunctionFlexible Circuit Board Repairing BD Board Conductor Side MDS-NT1 Section Servicing NotesJIG for Checking BD Board Waveform Record Procedure Criteria for Determination Measure if unsatisfactory Checks Prior to Parts Replacement and Adjustments in MDSoftware Reset Service ModeMicrocomputer Version Display System RequirementsFront View MDS-NT1 Section GeneralDisassembly Flow MDS-NT1 Section DisassemblyCase Upper MD Mechanism Deck MDM-7S2B Main BoardBD BOARD, Over Write Head HR901 Front Panel SectionLoading Motor Assy M103 Holder AssyOptical PICK-UP KMS-262E Sled Motor Assy M102Spindle Motor Assy M101 Precautions for USE of Test Mode MDS-NT1 Section Test ModeSetting the Test Mode Releasing the Test ModeCheck Selecting the Test ModeOperating the Continuous Playback Mode Information Automatic SELF-DIAGNOSIS FunctionMDS-NT1 Section Electrical Adjustments Parts Replacement and AdjustmentCheck before replacement YES Adjustment flowPrecautions for USE of Optical PICK- UP KMS-262A/262E Precautions for Checking Laser Diode EmissionHOW to Identify Optical PICK-UP KMS- 262A/KMS-262E KMS-262A KMS-262ELaser power meter Precautions for AdjustmentsTemperature Compensation Offset Check Using the Continuously Recorded DiscLaser Power Check Checks Prior to RepairsAuto Check Other ChecksTraverse Check CD Error Rate Check Play Check MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjustment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IopIop NV Save Traverse AdjustmentENTER/YES button Focus Bias AdjustmentAuto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjustment and Checking Loacation Block Diagram Servo Section MDS-NT1 Section Diagrams36 a Block Diagram Main Section22.7 ns Waveforms BD BoardSemiconductor Location Printed Wiring Board BD Board4AA 3AA B3B 2BB Schematic Diagram BD Board 2/2 See page 38 for WaveformsIC451 Printed Wiring Board Main Board Component SideMain Board Printed Wiring Board Main Board Conductor Side1AA AA2 AA3 GND Panel Board Conductor Side Printed Wiring Board Panel BoardSchematic Diagram Panel Board CXA2523AR IC Block Diagrams BD BoardMain Board IC401 BH6519FS-E2IC440 M54641L IC PIN Function Description BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMPMNT2 Xbusy Xcas APC Main Board IC301 M30835FJGP-01 System Controller PLAY-SW Pin No Extal Case Section Section MDS-NT1 Exploded Views56 4-951-620-01 Screw 2.6X8, +BVTP Case B Section 102 101 103104 105 311 310 319 304 308 302 306 320 301 305 313 314 315 316317 303 307 358 357 360 356 359364 355 354 362 359 352Resistors MDS-NT1 Section Electrical Parts ListDiode MDS-NT1 Main SwitchFB1 Miscellaneous MDS-NT1 Main PanelMotor ASSY, Loading Revision History