Agilent Technologies 46A, 45A, 54835A guide

Chapter 6: Replacing Assemblies

To remove and replace the scope interface board and SVGA display board

To remove and replace the scope interface board and SVGA display board

Use these steps to remove and replace the scope interface board and SVGA display boards. These boards must be removed and replaced as a unit. When necessary, refer to other removal procedures.

1Disconnect the power cable and remove the cover.

2Disconnect these cables from the scope interface board:

•Acquisition cable W11

•Keyboard cable W16

3Disconnect these cables from the SVGA display board:

•Display board to floppy cable W8

•Display board to hard drive cable W10

•Motherboard floppy cable W7

•Motherboard hard drive cable W9

•Backlight primary cable W17

•Display video cable W20

4Remove the two Torx T15 screws that secure the scope interface and SVGA display boards to the chassis.

These screws are at the rear of the chassis.

Figure 6-19

Removing the Scope Interface and SVGA Display Boards

5Grasp the scope interface and SVGA display boards at the top corners and pull them straight up until they are free of the card cage.

6To replace the scope interface and SVGA display boards, reverse the above procedure.

Be sure to observe correct polarity on all cables when replacing the boards.

6–17

Image 154

Agilent Technologies 46A, 45A, 54835A manual Disconnect these cables from the Svga display board

Contents

Agilent Model 54835A/45A/46A Oscilloscopes Ease of use with high performance Trigger setup controls set mode and basic parametersService Policy Display shows waveforms and graphical user interface Power Measurements This Book Contents To check the keyboard To check the LEDs ContentsNo Display Trouble Isolation To remove and replace the backlight inverter board Replaceable Parts To remove and replace the floppy disk drive General Information Oscilloscopes Covered by this Service Guide Instruments covered by this service guideModel Description Accessories supplied Accessories supplied Options available Options availableOption Number Description Required when using 2 or more Agilent 1144A active probes Accessories availableAccessories available Agilent 1144A MHz Active Probe Agilent Specifications & characteristics Specifications & characteristicsAcquisition Specifications & characteristics Vertical Whichever is larger HorizontalOffset Accuracy Post-trigger Specifications & characteristics Trigger Specifications & characteristics Display Measurements Computer System/ Storage Video Output CAT I and CAT II DefinitionsRise Time figures are calculated from tr=.35/Bandwidth Agilent Technologies 54835A/45A/46A general characteristics Agilent Technologies 54835A/45A/46A general characteristicsGeneral Characteristics Agilent Technologies 54835A/45A/46A general characteristics Recommended test equipment Agilent Service software No substitutionRecommended test equipment Agilent EPM Sensor 441A/Agilent 8482A Preparing for Use Preparing for Use To inspect the instrument To inspect the instrument To connect power To connect powerThree-wire Power Cable is Provided To attach the optional trackball To connect the mouse or other pointing deviceTo connect the mouse or other pointing device To attach the optional trackball To connect to the LAN card To connect the keyboardTo connect the keyboard To connect oscilloscope probes To connect oscilloscope probes To connect a printer To connect a printer To connect the Gpib cable To connect an external monitorTo connect an external monitor To tilt the oscilloscope upward for easier viewing To tilt the oscilloscope upward for easier viewing To power on the oscilloscope To power on the oscilloscopeYou Can Configure the Backlight Saver To verify basic oscilloscope operation Press the Default Setup key on the front panelGraphical Interface Enable Button Press the Autoscale key on the front panel To clean the display monitor contrast filter To clean the instrumentTo clean the instrument Testing Performance Test Interval Dependencies See Also Clear Display Let the Instrument Warm Up Before TestingAveraging To test the dc calibrator Enable the graphical interfaceProcedure Connect the multimeter to the front panel Aux Out BNC Set Aux Output to DC Set the output voltage If the test failsSelecting DC in the Calibration Dialog To test input resistance Input Resistance Equipment SetupTo test input resistance 25% accuracy Cables Connect the equipment SpecificationTo test voltage measurement accuracy To test voltage measurement accuracy Acquisition Setup for Voltage Accuracy Measurement Voltage Measurement Accuracy Equipment SetupUse the following table for steps 8 through Select Channel 1 as the source for the Vavg measurement Scale Offset Supply Tolerance LimitsSource Selection for Vavg Measurement To Set Vertical Scale and Position Set the scale from the table Set the offset from the table To test offset accuracy To test offset accuracyUse the following table for steps 6 through Volts/div Position Supply Tolerance Limits To test offset accuracy Real Time Specification Equivalent TimeTo test bandwidth Equivalent Time Test Select Vamptd from the Voltage submenu of the Measure menu Calculate the response using the formulaDisplayed. Note the Vamptd1 reading Real Time Test MΩ, 500 MHz Test on 54835A, 54845A, and 54846A To test time measurement accuracy Equivalent Time Mode ProcedureTo 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 Set horizontal time/div to 5 ns/div Acquisition Setup for Trigger Sensitivity TestTo test trigger sensitivity 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 Amplitude Input Channel Chan 4/Ext Resistance Agilent Technologies 54835A/45A/46A OscilloscopeTest Limits Results Vmax Vmin/5 = Voltage Scale Coupling Supply Limits Channel Channel 2 GSa/s Realtime Channel 4 GSa/sChannel 8 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 To check the power supplyDisconnect the oscilloscope power cord and remove the cover Equipment Critical Specifications Recommended Model/Part Power Supply Voltage Limits Supply Voltage Specification Limits Equipment Required To check the flat panel display FPD Flat-Panel Display SpecificationsWhen to Use this Procedure To check the flat panel display FPD Click Start Starting the Screen Test Repeat steps 6 and 7 for all colors Screen Test Self calibration To run the self calibrationTo run the self calibration Calibration time If calibration fails Click Start, then follow the instructions on the screenClear Cal Memory Protect to Run self calibration Click here to start calibrationPage Troubleshooting Troubleshooting To install the fan safety shield To install the fan safety shieldDisconnect the instrument power cord and remove the cover Installing the Fan Safety Shield To troubleshoot the instrument To troubleshoot the instrument Primary Trouble Isolation Flowchart Primary Trouble Isolation Primary Trouble Isolation Perform power-upPower-on Display Default Graphical Interface Disabled Check the display Check the front panel Run oscilloscope self-testsRun the Knob and Key selftest and the LED selftest No Display Trouble Isolation Flowchart Check the fan connections Remove the cabinet and install the fan safety shieldNo Display Trouble Isolation Sequence Completed its power-on test LEDs do not come on, Power-onPower supply indicator Isolation flowchart Configure the motherboard Not, the problem may be with Power to the instrument.Solenoids are preset Normal operating pattern Board video signals Power Supply Trouble Isolation Flowchart Power Supply Trouble Isolation Power Supply Trouble IsolationCheck the power supply voltages Approximate Resistance Values, Each Power Supply to Ground Power Supply Distribution Replace any shorted assemblyOverride the Remote Inhibit signal Power-up Sense Resistor Connection Check +15 V Bias and Remote Inhibit cabling Replace the power supplyRouting of +15 V Bias and Remote Inhibit Signals Check for the oscilloscope display onscreen To check probe power outputs To check probe power outputsPin Supply +3V Offset Data Probe ID Ring Clk +12 To check the keyboard When you are finished, click CloseTest Procedure To check the keyboard Troubleshooting Procedure Re-assemble the instrument Test by Rows To check the LEDsTo check the LEDs LED Test Screen When you are finished, click Close To check the motherboard, CPU, and RAM To check the motherboard, CPU, and RAMMessages Vary Slightly Signal To check the Svga display board video signalsTo check the Svga display board video signals Video Signals Backlight Inverter Board Input Voltages Input Pin # To check the backlight inverter voltagesTo check the backlight inverter voltages Backlight OFF Backlight on Post Code Listing Post Code Listing AMI Motherboard onlyPost Code Listing AMI Motherboard only Checkpoint Code Description Color settings next Keyboard BAT command is issuedUnblocking command Next Display memory read/write test next Clearing the memory below 1 MB for the soft reset next2Eh 2Fh Winbios Setup next Keyboard reset command nextCommand next After Winbios Setup next 9Ch 9BhCoprocessor text next 9Dh To configure the motherboard jumpers and set up the Bios To configure the motherboard jumpers and set up the BiosMotherboard / floppy drive configurations Bios setup 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 J37, J39 Configuring the AMI Series 727 Motherboard JumpersJ46 Series 727 Motherboard Jumpers J2J21 J11 J12 MHz Clock Is RequiredJ25J24 J37 Press F1 to run the Winbios setup To configure the AMI Series 727 Winbios Parameters System Keyboard Absent Do the following within the setup programWinbios Keyboard Commands Do steps h-l only if Your System has 64 Mb RAM Load Optimal Defaults Exit the Setup program, saving the changes you madeConfiguration Item Setting 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 Off FIC VA-503A MotherboardCore S1-1 S1-2 S1-3 S1-4 Ratio S2-1 S2-2 Under the Power Management Setup, change these settings Under the PnP/PCI Configuration, change these settings To troubleshoot the acquisition system Under Integrated Peripherals, change these settingsIsolating Acquisition Problems To troubleshoot the acquisition system Acquisition Trouble Isolation 1 Acquisition Trouble Isolation 2 Acquisition Trouble Isolation 3 Return the Known Good Attenuator to Original Channel To D Converter FailedAcquisition Trouble Isolation 4 Probe Board failed Temperature Sense failedFiso failed Offset DAC failed Interpolator failed Scroll Mode Counter failedTimer failed Timebase failed To troubleshoot attenuator failures To troubleshoot attenuator failuresAttenuator Click Test Swapping Attenuators Repeat steps 1 through 3 for the remaining input channelsAttenuator Connectivity Test Attenuator Assembly Troubleshooting Select About Infiniium... from the Help Menu Enable the Graphical InterfaceSoftware Revisions Software RevisionsPage Replacing Assemblies Replacing Assemblies Remove all accessories from the instrument To return the instrument to Agilent Technologies for service To remove and replace the cover To remove and replace the coverCover Fasteners To disconnect the cable To disconnect and connect Mylar flex cablesTo disconnect and connect Mylar flex cables To reconnect the cable To remove and replace the AutoProbe assembly To remove and replace the AutoProbe assemblyDisconnect the power cable and remove the cover Disconnecting W13 Avoid Damage to the Ribbon Cable and Faceplate Pushing Out the AutoProbe Faceplate Removing the Probe Power and Control Assembly To remove and replace the probe power and control assemblyTo remove and replace the probe power and control assembly Avoid Interference with the Fan To remove and replace the backlight inverter board To remove and replace the front panel assemblyTo remove and replace the backlight inverter board Removing the Backlight Inverter Board SMB Cable W18 and Comp Wire W19 To remove and replace the front panel assemblyRemoving the BNC Nuts 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 To remove and replace the acquisition board assembly To remove and replace the acquisition board assemblyRemoving the Acquisition Assembly To remove and replace the LAN interface board To replace the board, reverse the removal procedureTo remove and replace the LAN interface board Removing the LAN Interface Board To remove and replace the Gpib interface board To remove and replace the Gpib interface boardRemoving 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 To remove and replace the hard disk drive To remove and replace the hard disk driveRemoving the Hard Disk Drive To remove and replace the floppy disk drive To remove and replace the floppy disk driveTo remove and replace the motherboard Removing the Floppy Disk Drive Screws To remove and replace the motherboard Disconnect these cables from the motherboardRemoving the Motherboard Torx Screws To remove and replace the motherboard To remove and replace the power supply To remove and replace the power supplyRemoving Power Supply Cables To remove and replace the fan To install the fan, reverse this procedureTo remove and replace the fan Removing Fan Fasteners To remove and replace the CPU To remove and replace the CPURemoving the CPU Removing and replacing SIMMs on the AMI motherboard To remove and replace RAM SIMMs or Sdram DIMMsTo remove and replace RAM SIMMs or Sdram DIMMs Removing RAM SIMMs To remove and replace an attenuator To remove and replace an attenuatorDo Not Remove the Attenuators from the Acquisition Board If You Permanently Replace Parts Removing an Attenuator To reset the attenuator contact counter To reset the attenuator contact counterSelf Test Attenuator Channel box, select the channel you are changing Attenuator Relay Actuations SetupRepeat for each channel you need to change To remove and replace an acquisition hybrid To remove and replace an acquisition hybridTo remove the acquisition hybrid To replace the acquisition hybrid Do not USE Excessive Force Hybrid Connector Removing the Hybrid Connector Replaceable Parts Unlisted Parts Ordering Replaceable PartsListed Parts Direct Mail Order System Power Cables and Plug Configurations Power Cables and Plug ConfigurationsPlug Type Cable Plug Description Length Color Country In/cm MP61 MP17 MP62 or MP63 MP15 and MP49 Exploded ViewsExploded Views Front Frame and Front Panel Fan and Acquisition Assembly A10 MP57 Power Supply and PC MotherboardH12 H24 H25 MP55 MP60 H11 Exploded Views A4A1W24/25 A4A4 Exploded Views Exploded Views W17W20 A15 W14 W11 A19 W16 A14 W24/25 W27 W22 A4A1 FIC VA-503A Motherboard for PC Motherboard ConfigurationH23 A4A2 Exploded Views MP12 Sleeve and Accessory PouchMP14 MP52 MP70 MP72 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 FPD Monitor Assembly Power Supply AssemblyBlock-Level Theory Disk Drives Acquisition SystemFront Panel Attenuators Svga Display Card Probe Power and ControlGpib Interface Card Acquisition Block Diagram Attenuator Theory Attenuator TheoryAcquisition Theory Acquisition Board Acquisition Theory Acquisition Modes Scope Interface BoardPage Manufacturer’s Address Manufacturer’s NameSupplementary Information Product Regulations Restricted Rights Legend Product Warranty