Agilent Technologies 54621D, 54624A, 54622D, 54622A, 54621A manual To remove the power supply

Page 96

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

Contents Agilent 54621D/22D Mixed-Signal Oscilloscope Display shows current input signals Horizontal Controls select sweep speed and delay parametersSoftkeys extend the functionality of command keys UtilitiesThis Book Contents Solving General Problems with the Oscilloscopes Troubleshooting the OscilloscopeContents General Information General Information To inspect package contents General Information Package contents for 54620-Series Oscilloscopes To inspect options and accessories Option DescriptionAccessories available Model DescriptionPower Cords Plug Type Cable Part NumberPerformance Characteristics Acquisition Analog ChannelsAcquisition Digital Channels on 54621D and 54622D only Vertical System Analog Channels Probe ID Agilent/HP Auto probe sense Tek CompatibleVertical System Digital Channels 54621D and 54622D only Accuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mVHorizontal Sample rate of 200/400 MSa/sTrigger System CanAnalog Channel Triggering Digital D15 D0 Channel Triggering 54621D and 5462 2DExternal EXT Triggering Measurement Features Display SystemFFT StorageGeneral Characteristics Power RequirementsPreparing 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 Press the power switchTo power-on the oscilloscope To adjust the display intensity To adjust the display intensityIntensity control To connect the oscilloscope probes To compensate your probeTo connect the oscilloscope probes Press AutoscaleTo use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope onlyGrabber Signal Lead Ground Lead Grabber Signals Ground To connect a printer To connect an RS-232 cableTo connect a printer To verify basic oscilloscope operation Press the Autoscale key on the front panelTo verify basic oscilloscope operation Verifying Basic Oscilloscope OperationGetting started using the oscilloscope interface To verify basic oscilloscope operation Using Quick Help Preparing the Oscilloscope for Use Loading a language from floppy disk Loading a language from floppy diskCleaning the oscilloscope Disconnect power from the instrumentTesting Performance Testing Performance If a performance test failsEquipment Critical Specifications List of Test EquipmentList of Test Equipment Part NumberTo construct the test connector To construct the test connectorMaterials Required to Construct the Test Connectors Constructing the 8-by-2 ConnectorTo test the 54621D/22D Oscilloscope digital channels Press the Autoscale keyTo test the 54621D/22D Oscilloscope digital channels To verify digital channel threshold accuracy To verify digital channel threshold accuracyMethod 1 Using the Test Connector Method 2 Using the Test Fixture Threshold Accuracy Voltage Test Settings Threshold voltage setting DC offset voltage setting LimitsSet up the oscilloscope Equipment Critical Specifications Recommended Model/PartTo verify voltage measurement accuracy To verify voltage measurement accuracySettings Used to Verify Voltage Measurement Accuracy MV/Div 616 mV 384 mVUsing a Blocking Capacitor to Reduce Noise Use a Blocking Capacitor to Reduce NoiseTo verify bandwidth To verify bandwidthEquipment Required to Verify Bandwidth Calculate the response using this formula Signal Generator Frequency SettingChange the time base to 5 ns/div Selected Channel 54621A/21D 54622A/22D 54624ATo verify horizontal ∆t and 1/∆t accuracy To verify horizontal Dt and 1/Dt accuracyMeasure the following 54622A/22D/24A only54621A and 54621D only To verify trigger sensitivity To verify trigger sensitivityEquipment Required to Verify Trigger Sensitivity Test Internal Trigger Sensitivity Test External Trigger Sensitivity Agilent 54622A/22D/24A Performance Test Record Agilent 54621A/21D Performance Test Record Agilent 54621A/54621DCalibrating and Adjusting Calibrating and Adjusting Hazardous Voltages To adjust the power supply Prepare the oscilloscope for the voltage adjustmentTo adjust the power supply Digital multimeterPower Supply Voltage Tolerances Supply Voltage Tolerance+3.3V Adjustment To perform User Cal To perform User CalTo adjust the oscilloscope display To adjust the oscilloscope displayWhen to Adjust the Oscilloscope Display Do not adjust Sub Bri or Cont controls96,= Troubleshooting Troubleshooting Read All Cautions and WarningsSolving 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 Equipment Required to Troubleshoot the OscilloscopeConnector Load Amps Resistor Watts Location of the Low Voltage Power Supply ConnectorsTo construct your own dummy load To construct your own dummy loadConnect the power cord, then turn on the oscilloscope To check out the oscilloscopeTo check out the oscilloscope Display Signals on the System Board All Oscilloscopes Low Voltage Power Supply TolerancesSignal Name Frequency Pulse Width Voltage Location of the Fan Connector Is the fan running?To check the Low Voltage Power Supply To check the Low Voltage Power SupplyLow Voltage Power Supply Test Points If the Fuse is Blown Beware of Hazardous VoltagesTo run the internal self-tests To run the internal self-testsReplacing Assemblies Replacing Assemblies Avoid Electrical Shock To remove the cabinet To remove the cabinetRemoving the cabinet To remove the fan To remove the fanRemoving the fan To remove the floppy drive To remove the floppy driveRemoving the floppy drive To remove the front panel To remove the front panelRemoving the intensity shaft and front panel To remove the display To remove the displayRemoving the display Unhooking the power switch shaft To remove the system board To remove the system boardPreparing to remove the system board Removing the system board To remove the power supply To remove the power supplyDisconnecting ground wire and ribbon cable Unhooking the power switch shaft Removing the power supply To remove the keyboard assembly Lift the keyboard assembly straight outTo remove the keyboard assembly Removing the keyboard assemblyTo remove the handle To remove the handleReplaceable Parts Replaceable Parts To order a replacement part To order a replacement partExploded View of the 54621A/22A/24A/21D/22D Oscilloscope To order a replacement part Replaceable Parts Reference Agilent Part Qty Description Designator NumberMP1 Option Accessory pouch and front-panel cover ProbesInput Cable 54621D/22D only Manufacturer’s Name Manufacturer’s AddressProduct Name Model NumbersSafety Product RegulationsSound Pressure Level Regulatory Information for CanadaSafety Document Warranty Agilent Technologies, Inc

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