Sony MDS-JE640 Precautions for Checking Laser Diode Emission, Precautions for Adjustments

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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-260B)

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 connect- ing 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. PRECAUTIONS FOR ADJUSTMENTS

1)When replacing the following parts, perform the adjustments and checks with in the order shown in the following table.

2)Set the test mode when performing adjustments. After completing the adjustments, exit the test mode.

Perform the adjustments and checks in “group S” of the test mode.

3)Perform the adjustments to be needed in the order shown.

4)Use the following tools and measuring devices.

•Check Disc (MD) TDYS-1 (Parts No. 4-963-646-01)

•Test Disk (MDW-74/GA-1) (Parts No. 4-229-747-01)

•Laser power meter LPM-8001 (Parts No. J-2501-046-A)

or

MD Laser power meter 8010S (Parts No. J-2501-145-A)

•Oscilloscope (Measure after performing CAL of prove.)

•Digital voltmeter

•Thermometer

•Jig for checking BD board waveform (Parts No. : J-2501-196-A)

5)When observing several signals on the oscilloscope, etc., make sure that VC and ground do not connect inside the oscillo- scope.

(VC and ground will become short-circuited.)

6)Using the above jig enables the waveform to be checked without the need to solder.

(Refer to Servicing Note on page 6.)

7)As the disc used will affect the adjustment results, make sure that no dusts nor fingerprints are attached to it.

				Parts to be replaced
Adjustment
Adjustment	Optical	IC101	IC102	IC151	IC190	IC195	D101
	Pick-up	IC101	IC102	IC151	IC190	IC195	D101
	Pick-up

5-7. Initial setting of adjustment values

5-8. Recording of Iop information

5-9. TEMP ADJUST

5-10. Laser power adjustment

5-11. Iop NV Save

5-12. Traverse adjustment

5-13. Focus bias adjustment

5-16. Auto gain adjustment

5-6-4. AUTO CHECK

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Contents Outputs SpecificationsInputs NEWGeneral Supplied accessoriesSELF-DIAGNOSIS Function Three- or five Digit code Cause/Remedy MessageItems of Error History Mode Items and Contents Diagrams Table of ContentsDisassembly Exploded ViewsSection Service Notes Flexible Circuit Board RepairingJIG for Checking BD Board Waveform IOPRecord Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsMain Board Component Side Retry Cause Display Mode Bit BinaryHexadecimal t Binary Conversion Table Section General Section Disassembly Front Panel SectionMain Board PT BOARD, VOL-SEL BoardMechanism Deck Section MDM-7A BD BoardSetting the Test Mode Section Test ModePrecautions for USE of Test Mode Exiting the Test ModeSelecting the Test Mode Display Details Mark GroupOperating the Continuous Playback Mode MENU/NOError rate display Test Mode DisplaysMode display Functions of Other ButtonsAutomatic SELF-DIAGNOSIS Function When Memory NG is DisplayedMeanings of Other Displays InformationParts Replacement and Adjustment Section Electrical AdjustmentsCheck before replacement Adjustment flow YESPrecautions for USE of Optical PICK- UP KMS-260B Precautions for Checking Laser Diode EmissionPrecautions for Adjustments Using the Continuously Recorded Disc Checks Prior to RepairsAuto Check Other ChecksPlay Check MO Error Rate Check CD Error Rate CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Traverse Adjustment Iop NV SaveFocus Bias Adjustment YESCD Auto Gain Control Output Level Adjustment Error Rate CheckAuto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points For printed wiring boards Section DiagramsFor schematic diagrams Circuit Boards LocationSignal Path Block Diagrams BD SectionMDS-JE640 Main Section REC AnalogMain Board BD BoardDisplay Board Printed Wiring Board BD Section SemiconductorPIN PIN Function Printed Wiring Board Main Section Side a IC1 Printed Wiring Board Main Section Side BIC2 PIN MDS-JE640 Schematic Diagram Main /3 See page 47 for IC Block Diagrams Printed Wiring Board Power Section Printed Wiring Board Display Section Schematic Diagram Display Section See page 34 for Waveforms IC Block Diagrams IC101 CXA2523AR BD BoardIC400 LA5643 Main Board IC PIN Functions IC101 CXA2523AR RF Amplifier BD BoardMNT0 FOK Mvci Tfdr IC1 M30805SGP System Control Main Board HLDA/ALE Section Exploded Views Chassis SectionPanel ASSY, Front Black AEP,UK,CIS,SP,MY Panel ASSY, Front SilverMechanism MDM-7A 202 220 201 213 215 216 205 218 207Motor ASSY, Sled HEAD, Over LightMotor ASSY, Spindle Motor ASSY, LoadingSection Electrical Parts List IC MC74ACT08DTR2 IC TC7WU04FUTE12RMetal Chip IC BA033FP-E2Display KEY-SW Main PIN, Connector 4P PIN, Connector 3PCONNECTOR, FFC 17P PLUG, Connector 10P DiodeTransistor UN2211-TX IC SN74LVU04ANSRAEP,UK,CIS Transistor UN2111-TXTRANSFORMER, Power SP,MY ConnectorTRANSFORMER, Power CND Composition Circuit BlockVOL-SEL Sony Corporation