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Agilent Technologies 54621D To remove the power supply, Remove the fan, Replacing Assemblies

Models: 54621A 54622A 54622D 54621D 54624A

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Page 96

To remove the power supply

Replacing Assemblies

To remove the power supply

To remove the power supply

1Remove the fan.

2Disconnect the ground wire (green wire with the yellow stripe) from the deck.

3Disconnect the ribbon cable from the power supply board.

4Remove the printer power connector by sliding the connector out of the chassis.

Figure 6-9

Disconnecting ground wire and ribbon cable

6-12

Image 96

Agilent Technologies 54621D, 54624A, 54622D, 54622A, 54621A To remove the power supply, Remove the fan, Replacing Assemblies

Contents

Service Guide Agilent 54621D/22D Mixed-Signal OscilloscopeAgilent 54621A/22A/24A Oscilloscope and Publication Number DecemberDisplay shows current input signals Horizontal Controls select sweep speed and delay parametersSoftkeys extend the functionality of command keys The Oscilloscope At a GlanceIn This Book Contents 3 Testing Performance1 General Information Setting up the Oscilloscope4 Calibrating and Adjusting 5 TroubleshootingContents 6 Replacing AssembliesGeneral Information General Information To inspect package contents General InformationAgilent IntuiLink Data Capture for 54622A, 22D, or 24A Package contents for 54620-Series Oscilloscopes General InformationTo inspect options and accessories Option DescriptionAccessories available General InformationModel DescriptionTable 1-3. Power Cords General InformationPerformance Characteristics General InformationAcquisition Analog Channels Acquisition Analog ChannelsGeneral Information Vertical System Analog ChannelsVertical System Analog Channels with 10074C 101 probe CAT I 500 Vpk, CAT II 400 VpkGeneral Information Vertical System Analog Channels continuedVertical System Analog Channels continued Vertical System Digital Channels 54621D and 54622D only1-2-5 increments when off, 25 minor increments between major settings when on General InformationHorizontal HorizontalGeneral Information Trigger SystemTrigger System Trigger on a pattern of high, low, and don’t care levels and a rising or falling edgeGeneral Information Analog Channel TriggeringAnalog Channel Triggering Digital D15 - D0 Channel Triggering 54621D and 5462 2DMeasurement Features General InformationDisplay System Display System3 setups and traces can be saved and recalled internally General InformationStorage Optional GPIB Interface ModuleGeneral Characteristics General CharacteristicsPower Requirements Environmental CharacteristicsPreparing the Oscilloscope for Use Preparing the Oscilloscope for Use Setting up the Oscilloscope To adjust the handle To adjust the handleTo power-on the oscilloscope 2 Press the power switchTo power-on the oscilloscope To adjust the display intensity To adjust the display intensityTo increase display intensity, rotate the Intensity control clockwise To connect the oscilloscope probes To compensate your probeTo connect the oscilloscope probes 2 Press AutoscaleTo use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope onlyTo use the digital probes mixed-signal oscilloscope only 4 Connect the grabber to a node in the circuit you want to testPreparing the Oscilloscope for Use Signal Lead Ground Lead Grabber Channel Pod Ground Circuit GroundSignals Ground 2-11To connect a printer To connect an RS-232 cable2 Attach the larger 36-pin “D” connector to the printer 3 Set up the printer configuration on the oscilloscopeTo verify basic oscilloscope operation Getting started using the oscilloscope interface This menu is only accessible when the oscilloscope first starts up2-14 Use the Entry knob labeled to adjust the parameter To verify basic oscilloscope operationUsing Quick Help Selecting a language for Quick Help when the oscilloscope starts upPreparing the Oscilloscope for Use Loading a language from floppy disk Cleaning the oscilloscope Testing Performance Testing Performance List of Test Equipment Testing PerformanceSee “To construct the test connector ” List of Test EquipmentTo construct the test connector To test the 54621D/22D Oscilloscope digital channels Testing PerformanceOnly the 54621D/22D Mixed-Signal Oscilloscope has Digital Channels 3 Press the Autoscale keyTo verify digital channel threshold accuracy To verify digital channel threshold accuracy2 Set up the oscilloscope calibrator Method 2 - Using the Test Fixture See figurea Set the threshold voltage shown in the User softkey using the Entry knob on the oscilloscope To verify voltage measurement accuracy 1 Set up the oscilloscopeTo verify voltage measurement accuracy Equipment Required to Verify Voltage Measurement AccuracyTesting Performance b Set the Volts/Div setting to the value in the first line in TableSettings Used to Verify Voltage Measurement Accuracy Volts/Div SettingUsing a Blocking Capacitor to Reduce Noise Wait a few seconds for the measurement to settle3-12 To verify bandwidth To verify bandwidth54621A and 54621D Equipment Required to Verify Bandwidth2 Set up the oscilloscope To verify horizontal ∆t and 1/∆t accuracy To verify horizontal Dt and 1/Dt accuracyEquipment Required to Verify Horizontal ∆t and 1/ ∆t Accuracy 5 Measure the following 7 Measure the following9 Measure the following To verify horizontal Dt and 1/Dt accuracyTo verify trigger sensitivity To verify trigger sensitivityEquipment Required to Verify Trigger Sensitivity 1 Press the Save/Recall key, then press the Default Setup softkey Test External Trigger Sensitivity Agilent 54622A/22D/24A Performance Test Record Agilent 54622A/54622D/54624AAgilent 54621A/21D Performance Test Record Agilent 54621A/54621DCalibrating and Adjusting Calibrating and Adjusting Let the Equipment Warm Up Before AdjustingRead All Cautions and Warnings REMOVE POWER TO AVOID DAMAGE USE EXTERNAL FAN TO REDUCE TEMPERATUREW A R N I N G C A U T I O N C A U T I O N C A U T I O N HAZARDOUS VOLTAGESTo adjust the power supply 1 Prepare the oscilloscope for the voltage adjustmentTo adjust the power supply Calibrating and Adjusting To adjust the power supplyPower Supply Voltage Tolerances measure at J4 on the power supply boardLow Voltage Power Supply Adjustments on the top of the oscilloscope To perform User Cal 1 Disconnect all inputs signals from the oscilloscope2 Set the rear-panel CALIBRATION switch to UNPROTECTED To perform User CalTo adjust the oscilloscope display Calibrating and AdjustingTo adjust the oscilloscope display When to Adjust the Oscilloscope Display96,= Troubleshooting Troubleshooting Using the Dummy LoadSolving General Problems with the Oscilloscopes If there is no trace displayIf the trace display is unusual or unexpected If the trace display is unusual or unexpectedIf you cannot see a channel If you cannot see a channelTroubleshooting the Oscilloscope HAZARDOUS VOLTAGES EXIST - REMOVE POWER FIRSTREMOVE POWER TO AVOID DAMAGE Equipment required for troubleshootingTo construct your own dummy load 2 Connect load resistors to the connector as followsTroubleshooting To construct your own dummy loadTo check out the oscilloscope 3 Disconnect the power cord, then remove the cabinet4 Connect the power cord, then turn on the oscilloscope 2 Disconnect any external cables from the front panel6 Disconnect the ribbon cable from the display board 8 Is the fan running? To check out the oscilloscopeTo check the Low Voltage Power Supply oscilloscope. Connect the power cord and turn on the oscilloscopeMeasure the power supply voltages at E1 through E6 on the system To check the Low Voltage Power SupplyBEWARE OF HAZARDOUS VOLTAGES To run the internal self-tests 1 Press the Utility key, then press the Service softkey2 Begin the internal self tests by pressing the Self Test softkey To run the internal self-testsReplacing Assemblies Tools Used for Disassembly Replacing AssembliesSee how the Oscilloscope Parts Fit Together Read All Warnings and CautionsREMOVE POWER TO AVOID DAMAGE W A R N I N G W A R N I N GReplacing Assemblies HAZARDOUS VOLTAGESTo remove the cabinet To remove the fan 1 Disconnect the fan cable from the power supply boardReplacing Assemblies To remove the fanTo remove the floppy drive To remove the front panel 2 Disconnect the keyboard ribbon cable W2 from the keyboardTo remove the display Unhooking the power switch shaft 5 Lift the display and remove it from the deckTo remove the system board Replacing Assemblies To remove the system boardRemoving the system board To remove the power supply 3 Disconnect the ribbon cable from the power supply boardTo remove the power supply 1 Remove the fan5 Use a flat-blade screwdriver to gently unhook the latch that holds the white power-actuator shaft to the power switch, then disconnect the shaft from the power switch. After you disconnect the shaft, make sure you position it in the recess along the side of the display bracket To remove the power supply Removing the power supplyReplacing Assemblies To remove the keyboard assembly To remove the keyboard assemblyReplacing Assemblies C A U T I O NTo remove the handle Pull the sides of the handle out of the cabinetReplacing Assemblies To remove the handleReplaceable Parts Replaceable Parts To order a replacement part To order a replacement partTo order a replacement part Replaceable PartsExploded View of the 54621A/22A/24A/21D/22D Oscilloscope To order a replacement part Replaceable PartsReplaceable Parts Refurbished Product 2 CH 60MHz54621A-Agilent ExpressTo order a replacement part Cabinet assembly with handle and feet installedReplaceable Parts 54621A/22A - 3 ea 54624A - 4 eaTo order a replacement part Package replacement probe grounds quantityPackage replacement pod grounds quantity Replaceable PartsDECLARATION OF CONFORMITY NameICES/NMB-001 Product RegulationsSafety Notices To clean the instrumentSafety Symbols Hazardous voltage symbolNotices Document WarrantyAgilent Technologies, Inc Manual Part Number