Precautions for Checking Laser Diode Emission | Sony MDS-NT1

MDS-NT1

5-2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSION

To check the emission of the laser diode during adjustments, never view directly from the top as this may lose your eye-sight.

5-3. PRECAUTIONS FOR USE OF OPTICAL PICK- UP (KMS-262A/262E)

As the laser diode in the optical pick-up is easily damaged by static electricity, solder the laser tap of the flexible board when using it. Before disconnecting the connector, desolder first. Before con- necting the connector, be careful not to remove the solder. Also take adequate measures to prevent damage by static electricity. Handle the flexible board with care as it breaks easily.

pick-up	flexible board

laser tap

Optical pick-up flexible board

5-4. HOW TO IDENTIFY OPTICAL PICK-UP KMS- 262A/KMS-262E

This set uses optical pick-up KMS-262E in the production, but for the repair, only the KMS-262A is supplied. As a result, two types of optical pick-ups are used for this set, and the specified values for the check and adjustment of the laser power vary depending on the type. Therefore, in performing the check and adjustment of the laser power, first make sure the type of optical pick-up. The type of optical pick-up can be identified as follows.

– KMS-262A	–	– KMS-262E –
[Top view]	[Side view]	[Top view] [Side view]

TYPE2 VR (small)

TYPE3 VR (large)

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Sony MDS-NT1 Precautions for Checking Laser Diode Emission, Precautions for USE of Optical PICK- UP KMS-262A/262E

Contents

Specifications MDS-NT1 Playback Recording Cause/Remedy Indicator Green Red MDS-NT1 SELF-DIAGNOSIS Function Items of Error History Mode Items and Contents MDS-NT1 Table of Error Codes Error Code Details of Error Diagrams Table of ContentsDisassembly SELF-DIAGNOSIS Function Flexible Circuit Board Repairing MDS-NT1 Section Servicing Notes BD Board Conductor Side JIG for Checking BD Board Waveform Record Procedure Checks Prior to Parts Replacement and Adjustments in MD Criteria for Determination Measure if unsatisfactory Microcomputer Version Display Service ModeSoftware Reset System Requirements MDS-NT1 Section General Front View MDS-NT1 Section Disassembly Disassembly Flow Case Upper Main Board MD Mechanism Deck MDM-7S2B Front Panel Section BD BOARD, Over Write Head HR901 Holder Assy Loading Motor Assy M103 Sled Motor Assy M102 Optical PICK-UP KMS-262E Spindle Motor Assy M101 Setting the Test Mode MDS-NT1 Section Test ModePrecautions for USE of Test Mode Releasing the Test Mode Selecting the Test Mode Check Operating the Continuous Playback Mode Automatic SELF-DIAGNOSIS Function Information Check before replacement MDS-NT1 Section Electrical AdjustmentsParts Replacement and Adjustment Adjustment flow YES HOW to Identify Optical PICK-UP KMS- 262A/KMS-262E Precautions for Checking Laser Diode EmissionPrecautions for USE of Optical PICK- UP KMS-262A/262E KMS-262A KMS-262E Precautions for Adjustments Laser power meter Laser Power Check Using the Continuously Recorded DiscTemperature Compensation Offset Check Checks Prior to Repairs Traverse Check Auto CheckOther Checks Focus Bias Check Play Check MO Error Rate CheckCD Error Rate Check Self-Recording/playback Check Laser Power Adjustment Initial Setting of Adjustment ValueTemperature Compensation Offset Adjustment Recording and Displaying the Iop Traverse Adjustment Iop NV Save Focus Bias Adjustment ENTER/YES button CD Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment MO Auto Gain Control Output Level Adjustment Adjustment and Checking Loacation MDS-NT1 Section Diagrams Block Diagram Servo Section Block Diagram Main Section 36 a Waveforms BD Board 22.7 ns Printed Wiring Board BD Board Semiconductor Location 4AA 3AA Schematic Diagram BD Board 2/2 See page 38 for Waveforms B3B 2BB Printed Wiring Board Main Board Component Side IC451 Printed Wiring Board Main Board Conductor Side Main Board 1AA AA2 AA3 GND Printed Wiring Board Panel Board Panel Board Conductor Side Schematic Diagram Panel Board IC Block Diagrams BD Board CXA2523AR IC401 BH6519FS-E2 Main Board IC440 M54641L BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMP IC PIN Function Description MNT2 Xbusy Xcas APC Main Board IC301 M30835FJGP-01 System Controller PLAY-SW Pin No Extal Section MDS-NT1 Exploded Views Case Section 56 4-951-620-01 Screw 2.6X8, +BVTP 104 105 Case B Section102 101 103 317 303 307 311 310 319 304 308302 306 320 301 305 313 314 315 316 364 359358 357 360 356 355 354 362 359 352 MDS-NT1 Section Electrical Parts List Resistors Diode Switch MDS-NT1 Main FB1 MDS-NT1 Main Panel Miscellaneous Motor ASSY, Loading Revision History