Acquisition Trouble Isolation 2 | Agilent Technologies 54835A, 45A

Chapter 5: Troubleshooting

To troubleshoot the acquisition system

Acquisition Trouble Isolation (2 of 4)

5–51

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Agilent Technologies 54835A, 45A, 46A manual Acquisition Trouble Isolation 2

Contents

Agilent Model 54835A/45A/46A Oscilloscopes Trigger setup controls set mode and basic parameters Service PolicyEase of use with high performance Display shows waveforms and graphical user interface Power Measurements This Book Contents Contents No Display Trouble IsolationTo check the keyboard To check the LEDs To remove and replace the backlight inverter board Replaceable Parts To remove and replace the floppy disk drive General Information Model Description Instruments covered by this service guideOscilloscopes Covered by this Service Guide Accessories supplied Accessories supplied Option Number Description Options availableOptions available Accessories available Accessories availableRequired when using 2 or more Agilent 1144A active probes Agilent 1144A MHz Active Probe Agilent Acquisition Specifications & characteristicsSpecifications & characteristics Specifications & characteristics Vertical Horizontal Offset AccuracyWhichever is larger Post-trigger Specifications & characteristics Trigger Specifications & characteristics Display Measurements Computer System/ Storage Rise Time figures are calculated from tr=.35/Bandwidth CAT I and CAT II DefinitionsVideo Output General Characteristics Agilent Technologies 54835A/45A/46A general characteristicsAgilent Technologies 54835A/45A/46A general characteristics Agilent Technologies 54835A/45A/46A general characteristics Agilent Service software No substitution Recommended test equipmentRecommended test equipment Agilent EPM Sensor 441A/Agilent 8482A Preparing for Use Preparing for Use To inspect the instrument To inspect the instrument Three-wire Power Cable is Provided To connect powerTo connect power To connect the mouse or other pointing device To connect the mouse or other pointing deviceTo attach the optional trackball To attach the optional trackball To connect the keyboard To connect the keyboardTo connect to the LAN card To connect oscilloscope probes To connect oscilloscope probes To connect a printer To connect a printer To connect an external monitor To connect an external monitorTo connect the Gpib cable To tilt the oscilloscope upward for easier viewing To tilt the oscilloscope upward for easier viewing You Can Configure the Backlight Saver To power on the oscilloscopeTo power on the oscilloscope Press the Default Setup key on the front panel Graphical Interface Enable ButtonTo verify basic oscilloscope operation Press the Autoscale key on the front panel To clean the instrument To clean the instrumentTo clean the display monitor contrast filter Testing Performance Test Interval Dependencies See Also Averaging Let the Instrument Warm Up Before TestingClear Display Enable the graphical interface ProcedureTo test the dc calibrator Connect the multimeter to the front panel Aux Out BNC Selecting DC in the Calibration Dialog If the test failsSet Aux Output to DC Set the output voltage Input Resistance Equipment Setup To test input resistanceTo test input resistance 25% accuracy Cables Specification To test voltage measurement accuracyConnect the equipment To test voltage measurement accuracy Use the following table for steps 8 through Voltage Measurement Accuracy Equipment SetupAcquisition Setup for Voltage Accuracy Measurement Source Selection for Vavg Measurement Scale Offset Supply Tolerance LimitsSelect Channel 1 as the source for the Vavg measurement To Set Vertical Scale and Position Set the scale from the table Set the offset from the table To test offset accuracy Use the following table for steps 6 throughTo test offset accuracy Volts/div Position Supply Tolerance Limits To test offset accuracy Specification Equivalent Time To test bandwidthReal Time Equivalent Time Test Displayed. Note the Vamptd1 reading Calculate the response using the formulaSelect Vamptd from the Voltage submenu of the Measure menu Real Time Test MΩ, 500 MHz Test on 54835A, 54845A, and 54846A Equivalent Time Mode Procedure To test time measurement accuracyTo test time measurement accuracy Equivalent Time ≥16 averages Horizontal Setup for Equivalent Time Procedure Waveform for Time Measurement Accuracy Check Acquisition Setup for Equivalent Time Procedure Source Selection for Delta Time Measurement Measurement Settings for Time Interval Measurement For valid statistical data New Measurement Settings for Delta Time Measurement Real-Time Mode Procedure Measurement Definitions for Real Mode Procedure Click Close Acquisition Setup for Trigger Sensitivity Test To test trigger sensitivitySet horizontal time/div to 5 ns/div To test trigger sensitivity Setting the Markers for a 0.5 Division Reference Turn on Channel 1 and turn off all other channels Procedure-Auxiliary Trigger Test If a test failsPage Agilent Technologies 54835A/45A/46A Oscilloscope Test Limits Results Vmax Vmin/5 =Amplitude Input Channel Chan 4/Ext Resistance Voltage Scale Coupling Supply Limits Channel Realtime Channel 4 GSa/s Channel 8 GSa/sChannel 2 GSa/s ∆Time edge#101 Limits Calibrating and Adjusting Calibrating and Adjusting Let the Oscilloscope Warm Up Before Adjusting Loading New Software To check the power supply Disconnect the oscilloscope power cord and remove the coverTo check the power supply Equipment Critical Specifications Recommended Model/Part Power Supply Voltage Limits Supply Voltage Specification Limits Equipment Required Flat-Panel Display Specifications When to Use this ProcedureTo check the flat panel display FPD To check the flat panel display FPD Click Start Starting the Screen Test Repeat steps 6 and 7 for all colors Screen Test To run the self calibration To run the self calibrationSelf calibration Calibration time Click Start, then follow the instructions on the screen Clear Cal Memory Protect to Run self calibrationIf calibration fails Click here to start calibrationPage Troubleshooting Troubleshooting To install the fan safety shield Disconnect the instrument power cord and remove the coverTo install the fan safety shield Installing the Fan Safety Shield To troubleshoot the instrument To troubleshoot the instrument Primary Trouble Isolation Flowchart Primary Trouble Isolation Perform power-up Power-on Display Default Graphical Interface DisabledPrimary Trouble Isolation Check the display Run the Knob and Key selftest and the LED selftest Run oscilloscope self-testsCheck the front panel No Display Trouble Isolation Flowchart Remove the cabinet and install the fan safety shield No Display Trouble IsolationCheck the fan connections Sequence Power-on Power supply indicator Isolation flowchartCompleted its power-on test LEDs do not come on, Configure the motherboard Power to the instrument. Solenoids are preset Normal operating patternNot, the problem may be with Board video signals Power Supply Trouble Isolation Flowchart Power Supply Trouble Isolation Check the power supply voltagesPower Supply Trouble Isolation Approximate Resistance Values, Each Power Supply to Ground Replace any shorted assembly Override the Remote Inhibit signalPower Supply Distribution Power-up Sense Resistor Connection Replace the power supply Routing of +15 V Bias and Remote Inhibit SignalsCheck +15 V Bias and Remote Inhibit cabling Check for the oscilloscope display onscreen Pin Supply +3V Offset Data Probe ID Ring Clk +12 To check probe power outputsTo check probe power outputs When you are finished, click Close Test ProcedureTo check the keyboard To check the keyboard Troubleshooting Procedure Re-assemble the instrument To check the LEDs To check the LEDsTest by Rows LED Test Screen When you are finished, click Close Messages Vary Slightly To check the motherboard, CPU, and RAMTo check the motherboard, CPU, and RAM To check the Svga display board video signals To check the Svga display board video signalsSignal Video Signals To check the backlight inverter voltages To check the backlight inverter voltagesBacklight Inverter Board Input Voltages Input Pin # Backlight OFF Backlight on Post Code Listing AMI Motherboard only Post Code Listing AMI Motherboard onlyPost Code Listing Checkpoint Code Description Keyboard BAT command is issued Unblocking commandColor settings next Next Clearing the memory below 1 MB for the soft reset next 2EhDisplay memory read/write test next 2Fh Keyboard reset command next Command nextWinbios Setup next After Winbios Setup next 9Bh Coprocessor text next9Ch 9Dh Motherboard / floppy drive configurations Bios setup To configure the motherboard jumpers and set up the BiosTo configure the motherboard jumpers and set up the Bios To configure the motherboard jumpers and set up the Bios Agilent Technologies Service Note Describes Upgrade Details To configure the motherboard jumpers and set up the Bios Configuring the AMI Series 727 Motherboard Jumpers J46J37, J39 Series 727 Motherboard Jumpers J25J24 J37 MHz Clock Is RequiredJ2J21 J11 J12 Press F1 to run the Winbios setup To configure the AMI Series 727 Winbios Parameters Do the following within the setup program Winbios Keyboard CommandsSystem Keyboard Absent Do steps h-l only if Your System has 64 Mb RAM Exit the Setup program, saving the changes you made Configuration Item SettingLoad Optimal Defaults Primary Configuring the AMI Series 757 Motherboard for 200 MHz CPU Series 757 Rev C Motherboard Jumpers Pin Do not Press F2 When to Do this Procedure Series 757 System Bios Settings with 1.44 Mbyte floppy drive Configuring the AMI Series 757 Motherboard for 300 MHz CPU Series 757 Rev D Motherboard Jumpers J14 J16 AMI Atlas-III PCI/ISA Do the following within the setup program Series 757 System Bios Settings with 120 Mbyte floppy drive FIC VA-503A Motherboard Core S1-1 S1-2 S1-3 S1-4Off Ratio S2-1 S2-2 Under the Power Management Setup, change these settings Under the PnP/PCI Configuration, change these settings Under Integrated Peripherals, change these settings Isolating Acquisition ProblemsTo troubleshoot the acquisition system To troubleshoot the acquisition system Acquisition Trouble Isolation 1 Acquisition Trouble Isolation 2 Acquisition Trouble Isolation 3 Acquisition Trouble Isolation 4 To D Converter FailedReturn the Known Good Attenuator to Original Channel Temperature Sense failed Fiso failedProbe Board failed Offset DAC failed Scroll Mode Counter failed Timer failedInterpolator failed Timebase failed Attenuator Click Test To troubleshoot attenuator failuresTo troubleshoot attenuator failures Attenuator Connectivity Test Repeat steps 1 through 3 for the remaining input channelsSwapping Attenuators Attenuator Assembly Troubleshooting Enable the Graphical Interface Software RevisionsSelect About Infiniium... from the Help Menu Software RevisionsPage Replacing Assemblies Replacing Assemblies Remove all accessories from the instrument To return the instrument to Agilent Technologies for service Cover Fasteners To remove and replace the coverTo remove and replace the cover To disconnect and connect Mylar flex cables To disconnect and connect Mylar flex cablesTo disconnect the cable To reconnect the cable To remove and replace the AutoProbe assembly Disconnect the power cable and remove the coverTo remove and replace the AutoProbe assembly Disconnecting W13 Avoid Damage to the Ribbon Cable and Faceplate Pushing Out the AutoProbe Faceplate To remove and replace the probe power and control assembly To remove and replace the probe power and control assemblyRemoving the Probe Power and Control Assembly Avoid Interference with the Fan To remove and replace the front panel assembly To remove and replace the backlight inverter boardTo remove and replace the backlight inverter board Removing the Backlight Inverter Board Removing the BNC Nuts To remove and replace the front panel assemblySMB Cable W18 and Comp Wire W19 Disconnecting W16, W20, and the Backlight Cables Front Panel Side Screws Keep Long Screws Separate for Re-assembly Front Panel Cover Plate Screws Removing the Cursor Keyboard Removing the backlights Removing the Acquisition Assembly To remove and replace the acquisition board assemblyTo remove and replace the acquisition board assembly To replace the board, reverse the removal procedure To remove and replace the LAN interface boardTo remove and replace the LAN interface board Removing the LAN Interface Board Removing the Gpib Interface Board To remove and replace the Gpib interface boardTo remove and replace the Gpib interface board Disconnect these cables from the Svga display board Removing the Scope Interface and Svga Display Boards To separate the scope interface board and Svga display board To separate the scope interface board and Svga display board To remove and replace the Option 200 sound card To replace the card, reverse the removal procedureTo remove and replace the Option 200 sound card Removing the Hard Disk Drive To remove and replace the hard disk driveTo remove and replace the hard disk drive To remove and replace the floppy disk drive To remove and replace the motherboardTo remove and replace the floppy disk drive Removing the Floppy Disk Drive Screws Removing the Motherboard Torx Screws Disconnect these cables from the motherboardTo remove and replace the motherboard To remove and replace the motherboard Removing Power Supply Cables To remove and replace the power supplyTo remove and replace the power supply To install the fan, reverse this procedure To remove and replace the fanTo remove and replace the fan Removing Fan Fasteners Removing the CPU To remove and replace the CPUTo remove and replace the CPU To remove and replace RAM SIMMs or Sdram DIMMs To remove and replace RAM SIMMs or Sdram DIMMsRemoving and replacing SIMMs on the AMI motherboard Removing RAM SIMMs Do Not Remove the Attenuators from the Acquisition Board To remove and replace an attenuatorTo remove and replace an attenuator If You Permanently Replace Parts Removing an Attenuator Self Test To reset the attenuator contact counterTo reset the attenuator contact counter Repeat for each channel you need to change Attenuator Relay Actuations SetupAttenuator Channel box, select the channel you are changing To remove the acquisition hybrid To remove and replace an acquisition hybridTo remove and replace an acquisition hybrid To replace the acquisition hybrid Do not USE Excessive Force Hybrid Connector Removing the Hybrid Connector Replaceable Parts Ordering Replaceable Parts Listed PartsUnlisted Parts Direct Mail Order System Plug Type Cable Plug Description Length Color Country In/cm Power Cables and Plug ConfigurationsPower Cables and Plug Configurations Exploded Views Exploded ViewsMP61 MP17 MP62 or MP63 MP15 and MP49 Front Frame and Front Panel Fan and Acquisition Assembly H12 H24 H25 MP55 MP60 H11 Power Supply and PC MotherboardA10 MP57 Exploded Views A4A1W24/25 A4A4 Exploded Views Exploded Views H23 A4A2 FIC VA-503A Motherboard for PC Motherboard ConfigurationW17W20 A15 W14 W11 A19 W16 A14 W24/25 W27 W22 A4A1 Exploded Views Sleeve and Accessory Pouch MP14 MP52 MP70 MP72MP12 H10 MP20 MP13 H19 H26 MP19 Attenuator Assembly Replaceable Parts List Replaceable Parts List Agilent Part Des Number QTY DRAM-SIMM 2MX32 8 MB Simm DRAM-DIMM 16MX32 64 MB Dimm Fans Cables Display BD. Jumper Page Theory of Operation Theory of Operation Block-Level Theory Power Supply AssemblyFPD Monitor Assembly Acquisition System Front PanelDisk Drives Attenuators Gpib Interface Card Probe Power and ControlSvga Display Card Acquisition Block Diagram Attenuator Theory Acquisition TheoryAttenuator Theory Acquisition Board Acquisition Theory Acquisition Modes Scope Interface BoardPage Supplementary Information Manufacturer’s NameManufacturer’s Address Product Regulations Restricted Rights Legend Product Warranty