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Agilent Technologies 54621D, 54624A, 54622D Is the fan running?, To check out the oscilloscope

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

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8Is the fan running?

Troubleshooting

To check out the oscilloscope

8Is the fan running?

The low voltage power supply has a thermal cut-out circuit. If the fan is defective, the low voltage power supply will shut down when it gets too hot for safe operation.

If the fan is running, perform the internal self-tests. Go to “To run the internal self-tests” on page 5-13.

If the fan is not running, it may be defective. Follow these steps: a Disconnect the fan cable from the power supply.

b Measure the fan voltage at the connector on the power supply. See Figure 5-2 for the location of the fan connector.

c If the fan voltage is approximately +8 Vdc, replace the fan. If the fan voltage is not approximately +8 Vdc, replace the power supply.

Figure 5-2

+3.3V Adjustment

+5.1 / -5.2 V	Fan Connector	Printer Power
Balance Adjustment

Location of the Fan Connector

5-10

Image 81

Agilent Technologies 54621D, 54624A, 54622D, 54622A, 54621A manual Is the fan running?, To check out the oscilloscope

Contents

Agilent 54621D/22D Mixed-Signal Oscilloscope Service GuideAgilent 54621A/22A/24A Oscilloscope and Publication Number DecemberHorizontal Controls select sweep speed and delay parameters Display shows current input signalsSoftkeys extend the functionality of command keys The Oscilloscope At a GlanceIn This Book 3 Testing Performance Contents1 General Information Setting up the Oscilloscope5 Troubleshooting 4 Calibrating and AdjustingContents 6 Replacing AssembliesGeneral Information General Information General Information To inspect package contentsAgilent IntuiLink Data Capture for 54622A, 22D, or 24A General Information Package contents for 54620-Series OscilloscopesOption Description To inspect options and accessoriesGeneral Information Accessories availableModel DescriptionGeneral Information Table 1-3. Power CordsGeneral Information Performance CharacteristicsAcquisition Analog Channels Acquisition Analog ChannelsVertical System Analog Channels General InformationVertical System Analog Channels with 10074C 101 probe CAT I 500 Vpk, CAT II 400 VpkVertical System Analog Channels continued General InformationVertical System Analog Channels continued Vertical System Digital Channels 54621D and 54622D onlyGeneral Information 1-2-5 increments when off, 25 minor increments between major settings when onHorizontal HorizontalTrigger System General InformationTrigger System Trigger on a pattern of high, low, and don’t care levels and a rising or falling edgeAnalog Channel Triggering General InformationAnalog Channel Triggering Digital D15 - D0 Channel Triggering 54621D and 5462 2DGeneral Information Measurement FeaturesDisplay System Display SystemGeneral Information 3 setups and traces can be saved and recalled internallyStorage 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 compensate your probe To connect the oscilloscope probesTo 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 Channel Pod Ground Circuit Ground Signal Lead Ground Lead Grabber2-11 Signals GroundTo connect an RS-232 cable To connect a printer2 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 To verify basic oscilloscope operation Use the Entry knob labeled to adjust the parameterSelecting a language for Quick Help when the oscilloscope starts up Using Quick HelpPreparing the Oscilloscope for Use Loading a language from floppy disk Cleaning the oscilloscope Testing Performance Testing Performance Testing Performance List of Test EquipmentSee “To construct the test connector ” List of Test EquipmentTo construct the test connector Testing Performance To test the 54621D/22D Oscilloscope digital channelsOnly 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 See figure Method 2 - Using the Test Fixturea Set the threshold voltage shown in the User softkey using the Entry knob on the oscilloscope 1 Set up the oscilloscope To verify voltage measurement accuracyTo verify voltage measurement accuracy Equipment Required to Verify Voltage Measurement Accuracyb Set the Volts/Div setting to the value in the first line in Table Testing PerformanceSettings 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 7 Measure the following 5 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/54622D/54624A Agilent 54622A/22D/24A Performance Test RecordAgilent 54621A/54621D Agilent 54621A/21D Performance Test RecordCalibrating and Adjusting Calibrating and Adjusting Let the Equipment Warm Up Before AdjustingRead All Cautions and Warnings USE EXTERNAL FAN TO REDUCE TEMPERATURE REMOVE POWER TO AVOID DAMAGEW 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 To adjust the power supply Calibrating and AdjustingPower Supply Voltage Tolerances measure at J4 on the power supply boardLow Voltage Power Supply Adjustments on the top of the oscilloscope 1 Disconnect all inputs signals from the oscilloscope To perform User Cal2 Set the rear-panel CALIBRATION switch to UNPROTECTED To perform User CalCalibrating and Adjusting To adjust the oscilloscope displayTo adjust the oscilloscope display When to Adjust the Oscilloscope Display96,= Troubleshooting Using the Dummy Load 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 channelHAZARDOUS VOLTAGES EXIST - REMOVE POWER FIRST Troubleshooting the OscilloscopeREMOVE POWER TO AVOID DAMAGE Equipment required for troubleshooting2 Connect load resistors to the connector as follows To construct your own dummy loadTroubleshooting To construct your own dummy load3 Disconnect the power cord, then remove the cabinet To check out the oscilloscope4 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 To check out the oscilloscope 8 Is the fan running?oscilloscope. Connect the power cord and turn on the oscilloscope To check the Low Voltage Power SupplyMeasure the power supply voltages at E1 through E6 on the system To check the Low Voltage Power SupplyBEWARE OF HAZARDOUS VOLTAGES 1 Press the Utility key, then press the Service softkey To run the internal self-tests2 Begin the internal self tests by pressing the Self Test softkey To run the internal self-testsReplacing Assemblies Replacing Assemblies Tools Used for DisassemblySee how the Oscilloscope Parts Fit Together Read All Warnings and CautionsW A R N I N G W A R N I N G REMOVE POWER TO AVOID DAMAGEReplacing Assemblies HAZARDOUS VOLTAGESTo remove the cabinet 1 Disconnect the fan cable from the power supply board To remove the fanReplacing Assemblies To remove the fanTo remove the floppy drive 2 Disconnect the keyboard ribbon cable W2 from the keyboard To remove the front panelTo remove the display 5 Lift the display and remove it from the deck Unhooking the power switch shaftTo remove the system board Replacing Assemblies To remove the system boardRemoving the system board 3 Disconnect the ribbon cable from the power supply board To remove the power supplyTo 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 NPull the sides of the handle out of the cabinet To remove the handleReplacing 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 Replaceable Parts To order a replacement partReplaceable Parts Refurbished Product 2 CH 60MHz54621A-Agilent ExpressCabinet assembly with handle and feet installed To order a replacement partReplaceable Parts 54621A/22A - 3 ea 54624A - 4 eaPackage replacement probe grounds quantity To order a replacement partPackage replacement pod grounds quantity Replaceable PartsName DECLARATION OF CONFORMITYProduct Regulations ICES/NMB-001To clean the instrument Safety NoticesSafety Symbols Hazardous voltage symbolDocument Warranty NoticesAgilent Technologies, Inc Manual Part Number