Agilent Technologies 54622A, 54624A, 54621D If the Fuse is Blown, Beware of Hazardous Voltages

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Troubleshooting

To check the Low Voltage Power Supply

Table 5-4	Low Voltage Power Supply Tolerances

	Supply Voltage	Tolerance
	+5.1 V	±153 mV (+4.947 V to +5.253 V)
	-5.2 V	±156 mV (-5.04 V to -5.36 V)
	+15.75 V	+1.260 V, -787 mV (+14.963 V to +17.010 V)
	+3.3 V	±100 mV (+3.20 V to +3.40 V)

4If the +5.1 V measurement is out of tolerance, adjust the +5.1 V adjustment on the power supply.

5If the -5.2 V measurement is out of tolerance, adjust the -5.2 V adjustment on the power supply.

The +15.75 V supply is not adjustable, and is dependent upon the +5.1 V supply.

If the Fuse is Blown

If the power supply fuse is blown, the power supply is defective, and you must replace it. See the “Replaceable Parts” chapter for information about removing the power supply.

C A U T I O N	BEWARE OF HAZARDOUS VOLTAGES !
	Be careful when performing component-level repair. Voltages greater than
	300 Vdc exist, and can cause injury.

5-12

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Contents Agilent 54621D/22D Mixed-Signal Oscilloscope Utilities Display shows current input signalsHorizontal Controls select sweep speed and delay parameters Softkeys extend the functionality of command keysThis 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 Press Autoscale To connect the oscilloscope probesTo compensate your probe To connect the oscilloscope probesTo 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 Verifying Basic Oscilloscope Operation To verify basic oscilloscope operationPress the Autoscale key on the front panel To verify 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 PerformancePart Number Equipment Critical SpecificationsList of Test Equipment List of Test EquipmentConstructing the 8-by-2 Connector To construct the test connectorTo construct the test connector Materials Required to Construct the Test ConnectorsTo 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 SettingsTo verify voltage measurement accuracy Set up the oscilloscopeEquipment Critical Specifications Recommended Model/Part 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 Selected Channel 54621A/21D 54622A/22D 54624A Calculate the response using this formulaSignal Generator Frequency Setting Change the time base to 5 ns/divTo 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 Digital multimeter To adjust the power supplyPrepare the oscilloscope for the voltage adjustment To adjust the power supplySupply Voltage Tolerance Power Supply Voltage Tolerances+3.3V Adjustment To perform User Cal To perform User CalDo not adjust Sub Bri or Cont controls To adjust the oscilloscope displayTo adjust the oscilloscope display When to Adjust the Oscilloscope Display96,= 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 OscilloscopeTo construct your own dummy load Connector Load Amps Resistor WattsLocation of the Low Voltage Power Supply Connectors 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 Removing the keyboard assembly To remove the keyboard assemblyLift the keyboard assembly straight out To remove 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 Model Numbers Manufacturer’s NameManufacturer’s Address Product NameRegulatory Information for Canada SafetyProduct Regulations Sound Pressure LevelSafety Agilent Technologies, Inc Document Warranty

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