Sony MDS-NT1 service manual Iop NV Save, Traverse Adjustment

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+
–
oscilloscope (DC range)

MDS-NT1

6.Click the [JOG UP] or [JOG DOWN] so that the reading of the laser power meter becomes specified value, click the

[ENTER/YES] to save it.

Specified Value:

Laser power meter reading: 8.2 to 8.6 mW (KMS-262A) 8.5 to 8.8 mW (KMS-262E)

Note: Do not perform the emission with 8.4 mW more than 15 seconds continuously.

7.Then, click the [JOG UP] or [JOG DOWN] to display “LDPWR CHECK” (C13).

8.Click the [ENTER/YES] once to display “L 0.90 mW $ ”. Check that the reading of the laser power meter become speci- fied value.

Specified Value:

Laser power meter reading: 0.84 to 0.92 mW (KMS-262A)

0.90to 0.96 mW (KMS-262E)

9.Click the [ENTER/YES] button once more to display “L 8.40 mW $ ” (KMS-262A) or “L 8.65 mW $ ” (KMS-262E). Check that the reading the laser power meter and digital volt- meter satisfy the specified value.

Note down the digital voltmeter reading value.

Specified Value:

Laser power meter reading : 8.4 ± 0.3 mW (KMS-262A) 8.65 ± 0.25 mW (KMS-262E)

Digital voltmeter reading : Value on the optical pick-up label

±10%

(Optical pick-up label)

KMS262A

(For details of the method for

20101

checking this value, refer to “8.

Recording and Displaying the Iop

B0825

Information”.)

 

 

Iop = 82.5 mA in this case

Iop (mA) = Digital voltmeter reading (mV)/1 (Ω )

10.Click the [MENU/NO] to display “LDPWR CHECK” (C13) and stop the laser emission.

(The [MENU/NO] is effective at all times to stop the laser emission.)

11.Click the [JOG UP] or [JOG DOWN] to display “Iop Write” (C05).

12.Click the [ENTER/YES]. When the display becomes Ref=@@@.@ (@ is an arbitrary number), click the [ENTER/YES] to display “Measu=@@@.@” (@ is an arbitrary number).

13.The numbers which can be changed will blink. Input the Iop value noted down at step 9.

To select the number : Click the [JOG UP] or [JOG DOWN].

To select the digit : Click the [PUSH].

14.When the [ENTER/YES] is clicked, “Complete!” will be dis- played momentarily. The value will be recorded in the non- volatile memory and the display will become “Iop Write” (C05).

Note: After step 4, each time the [ENTER/YES] is clicked, the display

will be switched “L 0.70 mW $ ” and “LD 7.50 mW $ ”. Nothing needs to be performed here.

Adjustment Location: BD board (see page 35)

5-12. Iop NV SAVE

Write the reference values in the nonvolatile memory to perform “Iop compare”. As this involves rewriting the reference values, do not perform this procedure except when adjusting the laser power during replacement of the optical pick-up and when replacing the IC102. Otherwise the optical pick-up check may deteriorate.

Note: Perform this function with the optical pick-up set at room tempera- ture.

Procedure:

1.Click the [JOG UP] or [JOG DOWN] to display “Iop NV Save” (C06).

2.Click the [ENTER/YES] and display “Iop [stop]”.

3.After the display changes to “Iop =xxsave?”, click the [ENTER/YES].

4.After “Complete!” is displayed momentarily, the display changes to “Iop 8.4 mW”.

5.After the display changes to “Iop=yysave?”, click the [ENTER/YES].

6.When “Complete!” is displayed, it means that Iop NV saving has been completed.

5-13. TRAVERSE ADJUSTMENT

Note 1: Data will be erased during MO reading if a recorded disc is used in this adjustment.

Note 2: If the traverse waveform is not clear, connect the oscilloscope as shown in the following figure so that it can be seen more clearly.

BD board

330 k Ω

CN105 pin 4 (TE)

CN105 pin 6 (VC) 10 pF

Connection:

oscilloscope (DC range)

BD board

 

 

CN105 pin 4

(TE)

+

V: 0.1 V/div

CN105 pin 6

(VC)

–

H: 10 ms/div

 

 

 

Adjusting Procedure:

1.Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin 6 (VC) on the BD board.

2.Load a disc (any available on the market). (Refer to Note 1)

3.Click the [STOP] after the [FF] clicked to move the optical pick-up outside the pit.

4.Click the [JOG UP] or [JOG DOWN] to display “EF MO ADJUST” (C07).

5.Click the [ENTER/YES] to display “EFB = MO-R”. (Laser power READ power/Focus servo ON/tracking servo OFF/spindle (S) servo ON)

6.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.

(Read power traverse adjustment)

Traverse Waveform

A

VC

B

Specification A = B

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Contents Specifications MDS-NT1Playback Recording Cause/Remedy Indicator Green Red MDS-NT1 SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents MDS-NT1Table of Error Codes Error Code Details of ErrorTable of Contents DisassemblyDiagrams SELF-DIAGNOSIS FunctionFlexible Circuit Board Repairing MDS-NT1 Section Servicing Notes BD Board Conductor SideJIG for Checking BD Board Waveform Record Procedure Checks Prior to Parts Replacement and Adjustments in MD Criteria for Determination Measure if unsatisfactoryService Mode Software ResetMicrocomputer Version Display System RequirementsMDS-NT1 Section General Front ViewMDS-NT1 Section Disassembly Disassembly FlowCase Upper Main Board MD Mechanism Deck MDM-7S2BFront Panel Section BD BOARD, Over Write Head HR901Holder Assy Loading Motor Assy M103Sled Motor Assy M102 Optical PICK-UP KMS-262ESpindle Motor Assy M101 MDS-NT1 Section Test Mode Precautions for USE of Test ModeSetting the Test Mode Releasing the Test ModeSelecting the Test Mode CheckOperating the Continuous Playback Mode Automatic SELF-DIAGNOSIS Function InformationCheck before replacement MDS-NT1 Section Electrical AdjustmentsParts Replacement and Adjustment Adjustment flow YESPrecautions for Checking Laser Diode Emission Precautions for USE of Optical PICK- UP KMS-262A/262EHOW to Identify Optical PICK-UP KMS- 262A/KMS-262E KMS-262A KMS-262EPrecautions for Adjustments Laser power meterUsing the Continuously Recorded Disc Temperature Compensation Offset CheckLaser Power Check Checks Prior to RepairsTraverse Check Auto CheckOther Checks Play Check MO Error Rate Check CD Error Rate CheckFocus Bias Check Self-Recording/playback CheckInitial Setting of Adjustment Value Temperature Compensation Offset AdjustmentLaser Power Adjustment Recording and Displaying the IopTraverse Adjustment Iop NV SaveFocus Bias Adjustment ENTER/YES buttonError Rate Check Auto Gain Control Output Level AdjustmentCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjustment and Checking Loacation MDS-NT1 Section Diagrams Block Diagram Servo SectionBlock Diagram Main Section 36 aWaveforms BD Board 22.7 nsPrinted Wiring Board BD Board Semiconductor Location4AA 3AA Schematic Diagram BD Board 2/2 See page 38 for Waveforms B3B 2BBPrinted Wiring Board Main Board Component Side IC451Printed Wiring Board Main Board Conductor Side Main Board1AA AA2 AA3 GND Printed Wiring Board Panel Board Panel Board Conductor SideSchematic Diagram Panel Board IC Block Diagrams BD Board CXA2523ARIC401 BH6519FS-E2 Main BoardIC440 M54641L BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMP IC PIN Function DescriptionMNT2 Xbusy Xcas APC Main Board IC301 M30835FJGP-01 System Controller PLAY-SW Pin No Extal Section MDS-NT1 Exploded Views Case Section56 4-951-620-01 Screw 2.6X8, +BVTP 104 105 Case B Section102 101 103 317 303 307 311 310 319 304 308302 306 320 301 305 313 314 315 316 359 358 357 360 356364 355 354 362 359 352MDS-NT1 Section Electrical Parts List ResistorsDiode Switch MDS-NT1 MainFB1 MDS-NT1 Main Panel MiscellaneousMotor ASSY, Loading Revision History
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