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Agilent Technologies 54622A, 54624A, 54621D, 54622D, 54621A manual Beware Of Hazardous Voltages

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

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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.

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Agilent Technologies 54622A, 54624A, 54621D, 54622D, 54621A manual Beware Of Hazardous Voltages

Contents

Publication Number December Service GuideAgilent 54621D/22D Mixed-Signal Oscilloscope Agilent 54621A/22A/24A Oscilloscope andThe Oscilloscope At a Glance Display shows current input signalsHorizontal Controls select sweep speed and delay parameters Softkeys extend the functionality of command keysIn This Book Setting up the Oscilloscope Contents3 Testing Performance 1 General Information6 Replacing Assemblies 4 Calibrating and Adjusting5 Troubleshooting ContentsGeneral 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 accessoriesDescription Accessories availableGeneral Information ModelGeneral Information Table 1-3. Power CordsAcquisition Analog Channels Performance CharacteristicsGeneral Information Acquisition Analog Channelswith 10074C 101 probe CAT I 500 Vpk, CAT II 400 Vpk General InformationVertical System Analog Channels Vertical System Analog ChannelsVertical System Digital Channels 54621D and 54622D only General InformationVertical System Analog Channels continued Vertical System Analog Channels continuedHorizontal 1-2-5 increments when off, 25 minor increments between major settings when onGeneral Information HorizontalTrigger on a pattern of high, low, and don’t care levels and a rising or falling edge General InformationTrigger System Trigger SystemDigital D15 - D0 Channel Triggering 54621D and 5462 2D General InformationAnalog Channel Triggering Analog Channel TriggeringDisplay System Measurement FeaturesGeneral Information Display SystemOptional GPIB Interface Module 3 setups and traces can be saved and recalled internallyGeneral Information StorageEnvironmental Characteristics General CharacteristicsGeneral 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 To power-on the oscilloscope2 Press the power switch To increase display intensity, rotate the Intensity control clockwise To adjust the display intensityTo adjust the display intensity 2 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 onlyPreparing the Oscilloscope for Use To use the digital probes mixed-signal oscilloscope only4 Connect the grabber to a node in the circuit you want to test Channel Pod Ground Circuit Ground Signal Lead Ground Lead Grabber2-11 Signals Ground3 Set up the printer configuration on the oscilloscope To connect a printerTo connect an RS-232 cable 2 Attach the larger 36-pin “D” connector to the printerTo verify basic oscilloscope operation 2-14 Getting started using the oscilloscope interfaceThis menu is only accessible when the oscilloscope first starts up 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 List of Test Equipment List of Test EquipmentTesting Performance See “To construct the test connector ”To construct the test connector 3 Press the Autoscale key To test the 54621D/22D Oscilloscope digital channelsTesting Performance Only the 54621D/22D Mixed-Signal Oscilloscope has Digital ChannelsTo 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 Equipment Required to Verify Voltage Measurement Accuracy To verify voltage measurement accuracy1 Set up the oscilloscope To verify voltage measurement accuracyVolts/Div Setting Testing Performanceb Set the Volts/Div setting to the value in the first line in Table Settings Used to Verify Voltage Measurement Accuracy3-12 Using a Blocking Capacitor to Reduce NoiseWait a few seconds for the measurement to settle Equipment Required to Verify Bandwidth To verify bandwidthTo verify bandwidth 54621A and 54621D2 Set up the oscilloscope Equipment Required to Verify Horizontal ∆t and 1/ ∆t Accuracy To verify horizontal ∆t and 1/∆t accuracyTo verify horizontal Dt and 1/Dt accuracy To verify horizontal Dt and 1/Dt accuracy 5 Measure the following7 Measure the following 9 Measure the followingEquipment Required to Verify Trigger Sensitivity To verify trigger sensitivityTo 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 Read All Cautions and Warnings Calibrating and AdjustingLet the Equipment Warm Up Before Adjusting HAZARDOUS VOLTAGES REMOVE POWER TO AVOID DAMAGEUSE EXTERNAL FAN TO REDUCE TEMPERATURE W 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 NTo adjust the power supply To adjust the power supply1 Prepare the oscilloscope for the voltage adjustment measure at J4 on the power supply board Calibrating and AdjustingTo adjust the power supply Power Supply Voltage TolerancesLow Voltage Power Supply Adjustments on the top of the oscilloscope To perform User Cal To perform User Cal1 Disconnect all inputs signals from the oscilloscope 2 Set the rear-panel CALIBRATION switch to UNPROTECTEDWhen to Adjust the Oscilloscope Display To adjust the oscilloscope displayCalibrating and Adjusting 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 channelEquipment required for troubleshooting Troubleshooting the OscilloscopeHAZARDOUS VOLTAGES EXIST - REMOVE POWER FIRST REMOVE POWER TO AVOID DAMAGETo construct your own dummy load To construct your own dummy load2 Connect load resistors to the connector as follows Troubleshooting2 Disconnect any external cables from the front panel To check out the oscilloscope3 Disconnect the power cord, then remove the cabinet 4 Connect the power cord, then turn on the oscilloscope6 Disconnect the ribbon cable from the display board To check out the oscilloscope 8 Is the fan running?To check the Low Voltage Power Supply To check the Low Voltage Power Supplyoscilloscope. Connect the power cord and turn on the oscilloscope Measure the power supply voltages at E1 through E6 on the systemBEWARE OF HAZARDOUS VOLTAGES To run the internal self-tests To run the internal self-tests1 Press the Utility key, then press the Service softkey 2 Begin the internal self tests by pressing the Self Test softkeyReplacing Assemblies Read All Warnings and Cautions Tools Used for DisassemblyReplacing Assemblies See how the Oscilloscope Parts Fit TogetherHAZARDOUS VOLTAGES REMOVE POWER TO AVOID DAMAGEW A R N I N G W A R N I N G Replacing AssembliesTo remove the cabinet To remove the fan To remove the fan1 Disconnect the fan cable from the power supply board Replacing AssembliesTo 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 Removing the system board Replacing AssembliesTo remove the system board 1 Remove the fan To remove the power supply3 Disconnect the ribbon cable from the power supply board To remove the power supply5 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 Replacing Assemblies To remove the power supplyRemoving the power supply C A U T I O N To remove the keyboard assemblyTo remove the keyboard assembly Replacing AssembliesTo remove the handle To remove the handlePull the sides of the handle out of the cabinet Replacing AssembliesReplaceable 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 partReplaceable Parts Refurbished Product 2 CH 60MHz54621A-Agilent Express To order a replacement partReplaceable Parts Replaceable Parts54621A/22A - 3 ea 54624A - 4 ea To order a replacement partCabinet assembly with handle and feet installed Replaceable PartsReplaceable Parts To order a replacement partPackage replacement probe grounds quantity Package replacement pod grounds quantityName DECLARATION OF CONFORMITYProduct Regulations ICES/NMB-001Hazardous voltage symbol Safety NoticesTo clean the instrument Safety SymbolsManual Part Number NoticesDocument Warranty Agilent Technologies, Inc

BEWARE OF HAZARDOUS VOLTAGES !