Agilent Technologies 54621A, 54624A, 54621D, 54622D, 54622A manual To remove the fan, Removing the fan

Page 89

Replacing Assemblies

To remove the fan

To remove the fan

1Disconnect the fan cable from the power supply board.

2Using the T20 TORX driver, remove the three screws that hold the fan to the deck.

Figure 6-2

Removing the fan

6-5

Image 89

Contents Agilent 54621D/22D Mixed-Signal Oscilloscope Horizontal Controls select sweep speed and delay parameters Display shows current input signalsSoftkeys extend the functionality of command keys UtilitiesThis Book Contents Contents Solving General Problems with the OscilloscopesTroubleshooting the Oscilloscope General Information General Information To inspect package contents General Information Package contents for 54620-Series Oscilloscopes Option Description To inspect options and accessoriesModel Description Accessories availablePlug Type Cable Part Number Power CordsAcquisition Digital Channels on 54621D and 54622D only Performance CharacteristicsAcquisition Analog Channels Probe ID Agilent/HP Auto probe sense Tek Compatible Vertical System Analog ChannelsAccuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mV Vertical System Digital Channels 54621D and 54622D onlySample rate of 200/400 MSa/s HorizontalCan Trigger SystemExternal EXT Triggering Analog Channel TriggeringDigital D15 D0 Channel Triggering 54621D and 5462 2D Display System Measurement FeaturesStorage FFTPower Requirements General 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 To power-on the oscilloscopePress the power switch Intensity control To adjust the display intensityTo adjust the display intensity To compensate your probe To connect the oscilloscope probesTo 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 a printerTo connect an RS-232 cable Press the Autoscale key on the front panel To verify basic oscilloscope operationTo 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 diskDisconnect power from the instrument Cleaning the oscilloscopeTesting Performance If a performance test fails Testing PerformanceList of Test Equipment Equipment Critical SpecificationsList 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 To test the 54621D/22D Oscilloscope digital channelsPress the Autoscale key To verify digital channel threshold accuracy To verify digital channel threshold accuracyMethod 1 Using the Test Connector Method 2 Using the Test Fixture Threshold voltage setting DC offset voltage setting Limits Threshold Accuracy Voltage Test SettingsEquipment Critical Specifications Recommended Model/Part Set up the oscilloscopeTo verify voltage measurement accuracy To verify voltage measurement accuracyMV/Div 616 mV 384 mV Settings Used to Verify Voltage Measurement AccuracyUse a Blocking Capacitor to Reduce Noise Using a Blocking Capacitor to Reduce NoiseEquipment Required to Verify Bandwidth To verify bandwidthTo verify bandwidth Signal Generator Frequency Setting Calculate the response using this formulaChange the time base to 5 ns/div Selected Channel 54621A/21D 54622A/22D 54624ATo verify horizontal Dt and 1/Dt accuracy To verify horizontal ∆t and 1/∆t accuracy54621A and 54621D only Measure the following54622A/22D/24A only Equipment Required to Verify Trigger Sensitivity To verify trigger sensitivityTo verify trigger sensitivity Test Internal Trigger Sensitivity Test External Trigger Sensitivity Agilent 54622A/22D/24A Performance Test Record Agilent 54621A/54621D Agilent 54621A/21D Performance Test RecordCalibrating and Adjusting Calibrating and Adjusting Hazardous Voltages Prepare the oscilloscope for the voltage adjustment To adjust the power supplyTo adjust the power supply Digital multimeterSupply Voltage Tolerance Power Supply Voltage Tolerances+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 Read All Cautions and Warnings TroubleshootingIf there is no trace display Solving General Problems with the OscilloscopesIf 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 channelEquipment Required to Troubleshoot the Oscilloscope Troubleshooting the OscilloscopeLocation of the Low Voltage Power Supply Connectors Connector Load Amps Resistor WattsTo construct your own dummy load To construct your own dummy loadTo check out the oscilloscope Connect the power cord, then turn on the oscilloscopeTo check out the oscilloscope Signal Name Frequency Pulse Width Voltage Display Signals on the System Board All OscilloscopesLow Voltage Power Supply Tolerances Is the fan running? Location of the Fan ConnectorLow Voltage Power Supply Test Points To check the Low Voltage Power SupplyTo check the Low Voltage Power Supply Beware of Hazardous Voltages If the Fuse is BlownTo run the internal self-tests To run the internal self-testsReplacing Assemblies Replacing Assemblies Avoid Electrical Shock Removing the cabinet To remove the cabinetTo remove the cabinet Removing the fan To remove the fanTo remove the fan Removing the floppy drive To remove the floppy driveTo remove the floppy drive Removing the intensity shaft and front panel To remove the front panelTo remove the front panel Removing the display To remove the displayTo remove the display Unhooking the power switch shaft Preparing to remove the system board To remove the system boardTo remove the system board Removing the system board Disconnecting ground wire and ribbon cable To remove the power supplyTo remove the power supply Unhooking the power switch shaft Removing the power supply Lift the keyboard assembly straight out To remove the keyboard assemblyTo 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 Reference Agilent Part Qty Description Designator Number To order a replacement part Replaceable PartsMP1 Input Cable 54621D/22D only Option Accessory pouch and front-panel coverProbes Manufacturer’s Address Manufacturer’s NameProduct Name Model NumbersProduct Regulations SafetySound Pressure Level Regulatory Information for CanadaSafety Agilent Technologies, Inc Document Warranty

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