To check the power supply

Chapter 4: Calibrating and Adjusting

There are no adjustments for the supply. Perform this procedure only if you suspect a power supply problem.

Equipment Required

	Equipment	Critical Specifications	Recommended Model/Part
	Digital Voltmeter	Accuracy ±0.05%	Agilent 34401A
	Procedure
1	Disconnect the oscilloscope power cord and remove the cover.
	If necessary, refer to the procedures in chapter 6, “Replacing Assemblies.”

WARNING	INJURY CAN RESULT!
	Use care when working around the oscilloscope with the cover off and power applied. The fan
	blades are exposed and could cause injury; also, there is approximately 900 V generated by the
	backlight inverter for the flat-panel display.
	Connect the oscilloscope power cord and set power switch to ON.
2
3	Refer to the following figure for testpoint locations.

Figure 4-1

Power Supply Test Points

4–4

Page 69

Image 69

Agilent Technologies 45A, 46A manual To check the power supply, Disconnect the oscilloscope power cord and remove the cover

Contents

Agilent Model 54835A/45A/46A Oscilloscopes Service Policy Trigger setup controls set mode and basic parametersEase of use with high performance Display shows waveforms and graphical user interface Measurements Power This Book Contents No Display Trouble Isolation ContentsTo check the keyboard To check the LEDs To remove and replace the backlight inverter board To remove and replace the floppy disk drive Replaceable Parts General Information Instruments covered by this service guide Oscilloscopes Covered by this Service GuideModel Description Accessories supplied Accessories supplied Options available Options availableOption Number Description Accessories available Accessories availableRequired when using 2 or more Agilent 1144A active probes Agilent 1144A MHz Active Probe Agilent Specifications & characteristics Specifications & characteristicsAcquisition Specifications & characteristics Vertical Offset Accuracy HorizontalWhichever is larger Post-trigger Specifications & characteristics Trigger Measurements Specifications & characteristics Display Computer System/ Storage CAT I and CAT II Definitions Video OutputRise 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 connect the mouse or other pointing device To attach the optional trackballTo connect the mouse or other pointing device To attach the optional trackball To connect the keyboard To connect to the LAN cardTo connect the keyboard To connect oscilloscope probes To connect oscilloscope probes To connect a printer To connect a printer To connect an external monitor To connect the Gpib cableTo 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 Graphical Interface Enable Button Press the Default Setup key on the front panelTo verify basic oscilloscope operation Press the Autoscale key on the front panel To clean the instrument To clean the display monitor contrast filterTo clean the instrument Testing Performance See Also Test Interval Dependencies Let the Instrument Warm Up Before Testing Clear DisplayAveraging Procedure Enable the graphical interfaceTo test the dc calibrator Connect the multimeter to the front panel Aux Out BNC If the test fails Set Aux Output to DC Set the output voltageSelecting DC in the Calibration Dialog To test input resistance Input Resistance Equipment SetupTo test input resistance 25% accuracy Cables To test voltage measurement accuracy SpecificationConnect the equipment To test voltage measurement accuracy Voltage Measurement Accuracy Equipment Setup Acquisition Setup for Voltage Accuracy MeasurementUse the following table for steps 8 through Scale Offset Supply Tolerance Limits Select Channel 1 as the source for the Vavg measurementSource Selection for Vavg Measurement Set the scale from the table Set the offset from the table To Set Vertical Scale and Position Use the following table for steps 6 through To test offset accuracyTo test offset accuracy Volts/div Position Supply Tolerance Limits To test offset accuracy To test bandwidth Specification Equivalent TimeReal Time Equivalent Time Test Calculate the response using the formula Select Vamptd from the Voltage submenu of the Measure menuDisplayed. Note the Vamptd1 reading MΩ, 500 MHz Test on 54835A, 54845A, and 54846A Real Time Test To test time measurement accuracy Equivalent Time Mode ProcedureTo test time measurement accuracy Equivalent Time ≥16 averages Waveform for Time Measurement Accuracy Check Horizontal Setup for Equivalent Time Procedure Source Selection for Delta Time Measurement Acquisition Setup for Equivalent Time Procedure For valid statistical data Measurement Settings for Time Interval Measurement New Measurement Settings for Delta Time Measurement Measurement Definitions for Real Mode Procedure Real-Time Mode Procedure Click Close To test trigger sensitivity Acquisition Setup for Trigger Sensitivity TestSet horizontal time/div to 5 ns/div To test trigger sensitivity Turn on Channel 1 and turn off all other channels Setting the Markers for a 0.5 Division Reference If a test fails Procedure-Auxiliary Trigger TestPage Test Limits Results Vmax Vmin/5 = Agilent Technologies 54835A/45A/46A OscilloscopeAmplitude Input Channel Chan 4/Ext Resistance Voltage Scale Coupling Supply Limits Channel Channel 8 GSa/s Realtime Channel 4 GSa/sChannel 2 GSa/s ∆Time edge#101 Limits Calibrating and Adjusting Calibrating and Adjusting Loading New Software Let the Oscilloscope Warm Up Before Adjusting Disconnect the oscilloscope power cord and remove the cover To check the power supplyTo check the power supply Equipment Critical Specifications Recommended Model/Part Supply Voltage Specification Limits Power Supply Voltage Limits Equipment Required When to Use this Procedure Flat-Panel Display SpecificationsTo check the flat panel display FPD To check the flat panel display FPD Starting the Screen Test Click Start Screen Test Repeat steps 6 and 7 for all colors To run the self calibration To run the self calibrationSelf calibration Calibration time Clear Cal Memory Protect to Run self calibration Click Start, then follow the instructions on the screenIf calibration fails Click here to start calibrationPage Troubleshooting Troubleshooting Disconnect the instrument power cord and remove the cover To install the fan safety shieldTo install the fan safety shield Installing the Fan Safety Shield To troubleshoot the instrument To troubleshoot the instrument Primary Trouble Isolation Primary Trouble Isolation Flowchart Power-on Display Default Graphical Interface Disabled Perform power-upPrimary Trouble Isolation Check the display Run oscilloscope self-tests Check the front panelRun the Knob and Key selftest and the LED selftest No Display Trouble Isolation Flowchart No Display Trouble Isolation Remove the cabinet and install the fan safety shieldCheck the fan connections Sequence Power supply indicator Isolation flowchart Power-onCompleted its power-on test LEDs do not come on, Configure the motherboard Solenoids are preset Normal operating pattern Power to the instrument.Not, the problem may be with Board video signals Power Supply Trouble Isolation Flowchart Check the power supply voltages Power Supply Trouble IsolationPower Supply Trouble Isolation Approximate Resistance Values, Each Power Supply to Ground Override the Remote Inhibit signal Replace any shorted assemblyPower Supply Distribution Power-up Sense Resistor Connection Routing of +15 V Bias and Remote Inhibit Signals Replace the power supplyCheck +15 V Bias and Remote Inhibit cabling 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 Test Procedure When you are finished, click CloseTo check the keyboard To check the keyboard Re-assemble the instrument Troubleshooting Procedure To check the LEDs To check the LEDsTest by Rows 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 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 Unblocking command Keyboard BAT command is issuedColor settings next Next 2Eh Clearing the memory below 1 MB for the soft reset nextDisplay memory read/write test next 2Fh Command next Keyboard reset command nextWinbios Setup next After Winbios Setup next Coprocessor text next 9Bh9Ch 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 To configure the motherboard jumpers and set up the Bios Agilent Technologies Service Note Describes Upgrade Details J46 Configuring the AMI Series 727 Motherboard JumpersJ37, J39 Series 727 Motherboard Jumpers MHz Clock Is Required J2J21 J11 J12J25J24 J37 To configure the AMI Series 727 Winbios Parameters Press F1 to run the Winbios setup Winbios Keyboard Commands Do the following within the setup programSystem Keyboard Absent Do steps h-l only if Your System has 64 Mb RAM Configuration Item Setting Exit the Setup program, saving the changes you madeLoad Optimal Defaults Primary Series 757 Rev C Motherboard Jumpers Configuring the AMI Series 757 Motherboard for 200 MHz CPU Pin Do not Press F2 When to Do this Procedure Series 757 System Bios Settings with 1.44 Mbyte floppy drive Series 757 Rev D Motherboard Jumpers Configuring the AMI Series 757 Motherboard for 300 MHz CPU J14 J16 AMI Atlas-III PCI/ISA Do the following within the setup program Series 757 System Bios Settings with 120 Mbyte floppy drive Core S1-1 S1-2 S1-3 S1-4 FIC VA-503A MotherboardOff Ratio S2-1 S2-2 Under the PnP/PCI Configuration, change these settings Under the Power Management Setup, change these settings Isolating Acquisition Problems Under Integrated Peripherals, change these settingsTo troubleshoot the acquisition system To troubleshoot the acquisition system Acquisition Trouble Isolation 1 Acquisition Trouble Isolation 2 Acquisition Trouble Isolation 3 To D Converter Failed Return the Known Good Attenuator to Original ChannelAcquisition Trouble Isolation 4 Fiso failed Temperature Sense failedProbe Board failed Offset DAC failed Timer failed Scroll Mode Counter failedInterpolator failed Timebase failed To troubleshoot attenuator failures To troubleshoot attenuator failuresAttenuator Click Test Repeat steps 1 through 3 for the remaining input channels Swapping AttenuatorsAttenuator Connectivity Test Attenuator Assembly Troubleshooting Software Revisions Enable the Graphical InterfaceSelect About Infiniium... from the Help Menu Software RevisionsPage Replacing Assemblies Replacing Assemblies To return the instrument to Agilent Technologies for service Remove all accessories from the instrument To remove and replace the cover To remove and replace the coverCover Fasteners To disconnect and connect Mylar flex cables To disconnect and connect Mylar flex cablesTo disconnect the cable To reconnect the cable Disconnect the power cable and remove the cover To remove and replace the AutoProbe assemblyTo remove and replace the AutoProbe assembly Disconnecting W13 Pushing Out the AutoProbe Faceplate Avoid Damage to the Ribbon Cable and 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 backlight inverter board To remove and replace the front panel assemblyTo remove and replace the backlight inverter board Removing the Backlight Inverter Board To remove and replace the front panel assembly SMB Cable W18 and Comp Wire W19Removing the BNC Nuts Front Panel Side Screws Disconnecting W16, W20, and the Backlight Cables Front Panel Cover Plate Screws Keep Long Screws Separate for Re-assembly Removing the backlights Removing the Cursor Keyboard 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 Removing the Scope Interface and Svga Display Boards Disconnect these cables from the Svga display board To separate the scope interface board and Svga display board To separate the scope interface board and Svga display board To replace the card, reverse the removal procedure To remove and replace the Option 200 sound cardTo 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 motherboard To remove and replace the floppy disk driveTo remove and replace the floppy disk drive Removing the Floppy Disk Drive Screws Disconnect these cables from the motherboard To remove and replace 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 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 To remove and replace an attenuator To remove and replace an attenuatorDo Not Remove the Attenuators from the Acquisition Board Removing an Attenuator If You Permanently Replace Parts To reset the attenuator contact counter To reset the attenuator contact counterSelf Test Attenuator Relay Actuations Setup Attenuator Channel box, select the channel you are changingRepeat 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 Do not USE Excessive Force To replace the acquisition hybrid Removing the Hybrid Connector Hybrid Connector Replaceable Parts Listed Parts Ordering Replaceable PartsUnlisted Parts Direct Mail Order System Power Cables and Plug Configurations Power Cables and Plug ConfigurationsPlug Type Cable Plug Description Length Color Country In/cm Exploded Views Exploded ViewsMP61 MP17 MP62 or MP63 MP15 and MP49 Front Frame and Front Panel Fan and Acquisition Assembly Power Supply and PC Motherboard A10 MP57H12 H24 H25 MP55 MP60 H11 Exploded Views A4A1W24/25 A4A4 Exploded Views Exploded Views FIC VA-503A Motherboard for PC Motherboard Configuration W17W20 A15 W14 W11 A19 W16 A14 W24/25 W27 W22 A4A1H23 A4A2 Exploded Views MP14 MP52 MP70 MP72 Sleeve and Accessory PouchMP12 H10 MP20 MP13 H19 H26 MP19 Attenuator Assembly Replaceable Parts List Replaceable Parts List QTY Agilent Part Des Number DRAM-SIMM 2MX32 8 MB Simm DRAM-DIMM 16MX32 64 MB Dimm Fans Cables Display BD. Jumper Page Theory of Operation Theory of Operation Power Supply Assembly FPD Monitor AssemblyBlock-Level Theory Front Panel Acquisition SystemDisk Drives Attenuators Probe Power and Control Svga Display CardGpib Interface Card Acquisition Block Diagram Acquisition Theory Attenuator TheoryAttenuator Theory Acquisition Board Acquisition Theory Scope Interface Board Acquisition ModesPage Manufacturer’s Name Manufacturer’s AddressSupplementary Information Product Regulations Restricted Rights Legend Product Warranty

Agilent Technologies 45A, 46A, 54835A manual To check the power supply, Power Supply Test Points

Models: 54835A 46A 45A

To check the power supply

To check the power supply

Equipment Required

Equipment

Critical Specifications

Recommended Model/Part

Procedure

Disconnect the oscilloscope power cord and remove the cover.

INJURY CAN RESULT!

Power Supply Test Points