Keysight 90000 X Series Service Manual
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Keysight 90000 X Series Service Manual

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Keysight Infiniium
90000 X/L-Series Oscilloscopes
Service Guide

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Summary of Contents for Keysight 90000 X Series

  • Page 1 Keysight Infiniium 90000 X/L-Series Oscilloscopes Service Guide...
  • Page 3 Service Guide Publication Number 54916- 97010 May 2015 © Keysight Technologies, Inc. 2011- 2015 Infiniium 90000 X / L- Series Oscilloscopes...
  • Page 4 Keysight Infiniium 90000 X-Series Oscilloscopes at a Glance Ease of use with high performance Acquisition and general controls start and stop the oscilloscope and do basic setup The Keysight Infiniium 90000 X-Series • Run and stop controls for continuous or single oscilloscopes combine unprecedented ease-of- acquisitions.
  • Page 5 In This Service Guide This guide provides the service information for the Keysight Technologies 90000 X- Series and 90000 L- Series oscilloscopes. It is divided into seven chapters. Chapter 1, "General Information," describes which oscilloscope models are covered by this guide, supplied accessories, and where to find the specifications for the 90000 X- Series / 90000 L- Series oscilloscopes.
  • Page 7 Instruments covered by this service guide Accessories supplied Specifications and Characteristics General Information...
  • Page 8 This manual will be revised when necessary. If you have an oscilloscope that was manufactured after the release of this manual, please check the Keysight Technologies website at www.keysight.com to see whether a newer version of this manual is available.
  • Page 9 • ESD wrist strap • Digital channels cable (MSO models only): Keysight part number N2815- 68701 • MSO calibrator board assembly (MSO models only): Keysight part number N2834- 68703 Specifications and Characteristics The following table contains a partial list of specifications and characteristics for the Keysight Infiniium 90000 X- Series oscilloscopes.
  • Page 10 Chapter 1: General Information Specifications and Characteristics Pollution Degree Pollution Degree 1: No pollution or only dry, non-conductive pollution occurs. The Definitions pollution has no influence. Example: A clean room or climate-controlled office environment. Pollution Degree 2. Normally only dry non-conductive pollution occurs. Occasionally a temporary conductivity caused by condensation may occur.
  • Page 11 Running a Self Calibration Calibration...
  • Page 12 A user calibration takes about 2- 1/4 hours, including the time required to change cables from channel to channel. • A service calibration is performed only by Keysight Service Center technicians. With a service calibration the 50 Ohm input resistance calibration is performed, in addition to everything calibrated with the user calibration.
  • Page 13 Equipment Critical Specifications Keysight Part Number Connector savers (5 supplied with 3.5mm (f) to 3.5 mm (f) Keysight 54916-68717 (for 20, 25, 28, oscilloscope) 30, and 32 GHz models) Keysight 54916-68716 (for 13 GHz and 16 GHz models) Cable (supplied with oscilloscope)
  • Page 14 Chapter 2: Calibration Running an Environmental Calibration 4 Click Start Quick Env Cal, then follow the instructions on the screen. The routine will prompt you to follow these steps: a Disconnect everything from all inputs and Cal Out. b Connect the calibration cable from Cal Out to channel 1. You must use the 54916- 61626 cable assembly with two connector saver adapters for all oscilloscopes.
  • Page 15 Equipment Required Equipment Critical Specifications Keysight Part Number Connector savers (5 supplied 3.5mm (f) to 3.5 mm (f) Keysight 54916-68717(for 20, 25, 28, with oscilloscope) 30, and 32 GHz models) Keysight 54916-68716 (for 13 GHz and 16 GHz models) Cable assembly...
  • Page 16 MSO calibrator. C A U T I O N Be sure to orient the digital channels cable with the Keysight part number facing downward as shown on the rear of the oscilloscope. See Figure 2- 3.
  • Page 17 Chapter 2: Calibration Running a user calibration Figure 2-3 Digital channels cable orientation C A U T I O N Insert the digital channels cable carefully into the MSO calibrator to prevent damage to the pins. Use the notches on the cable and the MSO calibrator to orient the cable correctly.
  • Page 18 Chapter 2: Calibration Running a user calibration...

  • Page 19: Table Of Contents

    Vertical Performance Verification Offset Accuracy Test DC Gain Accuracy Test Analog Bandwidth - - Maximum Frequency Test Time Scale Accuracy (TSA) Test Performance Test Record Testing Performance...
  • Page 20 The oscilloscopes in these lists are ones that are currently available for sale by Keysight at the time of writing this document. In some cases, the test procedures use features specific to the oscilloscopes in the recommended equipment list.

  • Page 21: Vertical Performance Verification

    Chapter 3: Testing Performance Vertical Performance Verification This section contains the following vertical performance verification tests: • Offset Accuracy Test • DC Gain Accuracy Test • Analog Bandwidth - - Maximum Frequency Test • Time Scale Accuracy (TSA) Test...

  • Page 22: Offset Accuracy Test

    Equipment Required Description Critical Specifications Recommended Model/ Part Numbers Digital Multimeter DC voltage measurement accuracy better than ±0.1% of reading Keysight 34401A or Keysight 3458A Cable Assembly 50Ω characteristic impedance, BNC (m) connectors Keysight 8120-1840 (2 required) Adapter BNC Tee (m)(f)(f)
  • Page 23 Chapter 3: Testing Performance Offset Accuracy Test b When the Acquisition Setup window appears, enable averaging and set the # of averages to 256 as shown below. 3 Filter out waveform noise by forcing the measurement calculations to wait until the average is computed.
  • Page 24 Chapter 3: Testing Performance Offset Accuracy Test b Click the V avg measurement on the left side of the screen. V avg measurement c When the Enter Measurement Info window appears, ensure that the V avg function is set up as follows and then click OK: Source = Channel 1 Measurement Area = Entire Display...
  • Page 25 Chapter 3: Testing Performance Offset Accuracy Test 5 Press [Clear Display] on the scope and wait for the #Avgs value (top right corner of screen) to return to 256. Record the scope's mean V avg reading in the Zero Error Test section of the Performance Test Record.
  • Page 26 Chapter 3: Testing Performance Offset Accuracy Test Offset Gain Test Make the connections to scope channel 1 as shown below. Connections Cal Out on Oscilloscope Front Panel Oscilloscope Channel Input Connection Saver Connection Saver BNC (f) to SMA (m) adapter BNC (f) to SMA (m) adapter Notes: •...
  • Page 27 Chapter 3: Testing Performance Offset Accuracy Test e When the Enter Measurement Info window appears, ensure that the V avg function is set up as follows and then click OK: Source = Channel 1 Measurement area = Entire Display 4 Set the channel 1 offset value to 400.0 mV by using the front panel control or: a Pull down the Setup menu and select Channel 1 or click the Channel 1 setup icon.
  • Page 28 Chapter 3: Testing Performance Offset Accuracy Test 7 Change the channel 1 offset value to - 400.0 mV. 8 Set the Cal Out voltage to - 400.0 mV. 9 Press [Clear Display] on the scope, wait for the #Avgs value (top left corner of screen) to return to 256, and then record the DMM voltage reading as V and the scope DMM-...

  • Page 29: Dc Gain Accuracy Test

    Equipment Required Description Critical Specifications Recommended Model/ Part Numbers Digital Multimeter DC voltage measurement accuracy better than ±0.1% of reading Keysight 34401A or Keysight 3458A Cable Assembly 50Ω characteristic impedance, BNC (m) connectors Keysight 8120-1840 (2 required) Adapter BNC Tee (m)(f)(f)
  • Page 30 Chapter 3: Testing Performance DC Gain Accuracy Test Procedure 1 Make the connections to scope channel 1 as shown below. Connections Cal Out on Oscilloscope Front Panel Oscilloscope Channel Input Connection Saver Connection Saver BNC (f) to SMA (m) adapter BNC (f) to SMA (m) adapter Notes: •...
  • Page 31 Chapter 3: Testing Performance DC Gain Accuracy Test b When the Acquisition Setup window appears, enable averaging and set the # of averages to 256 as shown below. 3 Filter out waveform noise by forcing the measurement calculations to wait until the average is computed.
  • Page 32 Chapter 3: Testing Performance DC Gain Accuracy Test 5 Set the channel 1 vertical scale value to 10 mV/div by using the front panel control or: a Pull down the Setup menu and select Channel 1 or click the Channel 1 setup icon. b Change the vertical scale of channel 1 to 10 mV/div.
  • Page 33 Chapter 3: Testing Performance DC Gain Accuracy Test Record the mean reading 7 Change the Cal Out voltage to - 30 mV. 8 Press [Clear Display] on the scope, wait for the #Avgs value to return to 256 and then record the DMM voltage reading and the scope V avg reading in the DC Gain Test section of the Performance Test Record.

  • Page 34: Analog Bandwidth - - Maximum Frequency Test

    Power Splitter 2 Resistor Power Splitter Keysight 11667C Max Frequency ≥32 GHz Power Meter Keysight E-series with power sensor compatibility Keysight E4418B or E4419B Maximum Frequency ≥ 32 GHz Power Sensor Keysight 8487A or Keysight Power range: -24 dBm to +16 dBm...
  • Page 35 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test Connections Microwave CW Generator E8257D Power meter E4418A or E4419A Oscilloscope Power splitter 11667C Connection saver Power sensor 11901A adapter cable Microwave cable Power sensor 11901C adapter E4413A Notes • Connect output 1 of the 11667C splitter to the scope Channel n input directly using the 11901A adapter and a connector saver (either 5061-5311 or 1250-3758 depending on the oscilloscope’s bandwidth), without any additional cabling or adapters.
  • Page 36 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test c Set the horizontal scale to 16 ns/div (to display 8 cycles of a 50 MHz waveform). Click here and enter 16 ns d Select Setup > Acquisition and then set up the acquisition parameters as follows: Sin(x)/x Interpolation = Auto Analog Averaging = Disabled Analog Memory Depth = Automatic...
  • Page 37 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test f When the Enter Measurement Info window appears, configure this measurement as follows: Source = Channel 1 Measurement Area = Entire Display RMS Type = AC 7 Set the generator to apply a 50 MHz sine wave with a peak- to- peak amplitude of about 4 divisions.
  • Page 38 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test 9 Press [Clear Display] on the scope and record the scope V rms reading in the Analog Bandwidth - Maximum Frequency Check section of the Performance Test Record (Vout @ 50 MHz). Notes •...
  • Page 39 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test 11 Change the generator frequency to the maximum value for the model being tested as shown in the table below. It is not necessary to adjust the signal amplitude at this point in the procedure.
  • Page 40 Chapter 3: Testing Performance Analog Bandwidth -- Maximum Frequency Test 16 Change the scope setup as follows: a Change the channel vertical scale to 20 mV/div. b Reset the horizontal scale to 16 ns/div (to display 8 cycles of a 50 MHz waveform). 17 Change the generator output as follows: a Reset the generator frequency to 50 MHz.

  • Page 41: Time Scale Accuracy (Tsa) Test

    Keysight E8267D PSG wave source Output Amplitude: 0 dBm Frequency Resolution: 0.1 Hz 10 MHz frequency Output Frequency: 10 MHz Keysight 53132A opt. 012 frequency counter Absolute Frequency Error: < ±0.0275 ppm reference RF cable 50 ohm characteristic impedance (no Keysight 8120-1840...
  • Page 42 Chapter 3: Testing Performance Time Scale Accuracy (TSA) Test Connections Connect the equipment as shown in the following figure. Procedure 1 Configure the sine wave source to output a 0 dBm (600 mVpp) sine wave into 50 ohms with a frequency of 10.00002000 MHz. 2 Adjust source amplitude such that displayed sine wave is 600 mVpp.

  • Page 43: Performance Test Record

    Chapter 3: Testing Performance Performance Test Record Performance Test Record Keysight Technologies Keysight 90000-X Series / 90000-L Series Oscilloscopes Model Number _____________________ Tested by___________________ Serial Number ___________________________ Work Order No.___________________ Recommended Test Interval - 1 Year/2000 hours Date___________________ Recommended next test date ___________________...
  • Page 44 Chapter 3: Testing Performance Performance Test Record Offset Gain Test Vertical Calculated Offset Gain Cal Out DMM+ DMM- DMM0 Scope+ Scope- Scope0 Scale Offset Gain Error Test Setting Error Limits Channel 1 10 mV/div ±400 mV ±2 % 20 mV/div ±400 mV ±2 % 50 mV/div...
  • Page 45 Chapter 3: Testing Performance Performance Test Record DC Gain Accuracy Test Vertical Scale Calculated DC Gain Error Cal Out DMM+ DMM- Scope+ Scope- DC Gain Test Limits Setting Error Channel 1 10 mV/div ±30 mV ±2 % 20 mV/div ±60 mV ±2 % 50 mV/div ±150 mV...
  • Page 46 Chapter 3: Testing Performance Performance Test Record Analog Bandwidth - Maximum Frequency Check Max frequency: MSO/DSO/DSAX91304A = 13 GHz, MSO/DSO/DSAX91604A = 16 GHz, MSO/DSO/DSAX92004A = 20 GHz, MSO/DSO/DSAX92504A = 25 GHz, MSO/DSO/DSAX92804A = 28 GHz, DSO/DSA93004L = 30 GHz, MSO/DSO/DSAX93204A = 32 GHz . Measurement Vin @ 50 MHz Vout @ 50...
  • Page 47 Time Scale Accuracy Measured Time Scale Years Since Calibration Low Test Limit (ppm) High Test Limit (ppm) Pass/Fail Error (ppm) (years) ___________ ___________ ___________ ___________ ___________...
  • Page 48 Chapter 3: Testing Performance Performance Test Record...
  • Page 49 Primary Trouble Isolation Power Supply Troubleshooting Setting Up the BIOS Motherboard Verification Display Troubleshooting Acquisition/Backplane Assembly Troubleshooting Keyboard Troubleshooting LED Troubleshooting Touch Screen Troubleshooting Checking Probe Power Outputs MSO Assembly Troubleshooting Before You Contact Keysight Troubleshooting...
  • Page 50 Troubleshooting The service strategy for troubleshooting Keysight 90000 X- Series oscilloscopes is to isolate problems to a faulty assembly, then use the disassembly and assembly procedures in the "Replacing Assemblies" chapter to replace the defective assembly. Read the Safety Notices at the back of this guide before servicing the oscilloscope.

  • Page 51: Primary Trouble Isolation

    Chapter 4: Troubleshooting Primary Trouble Isolation Primary Trouble Isolation The main procedural tool in this chapter is the flowchart. The Primary Trouble Isolation flowchart in Figure 4- 1 shows the entire troubleshooting path from a failed oscilloscope to a working one, and directs you to other sections in this chapter where the procedures are described in detail.
  • Page 52 Chapter 4: Troubleshooting Primary Trouble Isolation A Perform power- up. Connect the oscilloscope power cord and press the power button in the lower left corner of the front panel. If the oscilloscope is working properly, it will take several minutes to start up and the graticule will appear on the screen.
  • Page 53 Chapter 4: Troubleshooting Primary Trouble Isolation The Front Panel Keyboard Test window appears with a symbolic representation of the keyboard. See Figure 4- When you press a key or turn a knob in both directions, the corresponding symbol on this screen turns green.
  • Page 54 Chapter 4: Troubleshooting Primary Trouble Isolation Figure 4-4 LED test screen 3 Repeatedly press [Single] on the front panel to step through and highlight each LED symbol in the test screen. You can also step through the LEDs by pressing the <<...

  • Page 55: Power Supply Troubleshooting

    Chapter 4: Troubleshooting Power Supply Troubleshooting Power Supply Troubleshooting This section provides information to help you isolate the problem to the assembly level when the power system is not operating. There are three main types of faults: • Under- voltage faults •...
  • Page 56 Chapter 4: Troubleshooting Power Supply Troubleshooting To locate all four sets of LEDs, remove the handle, outer oscilloscope cover, and inner top cover to expose the motherboard cavity and top edges of the backplane assembly. The first set of LEDs is located in the upper right corner of the backplane assembly (see Figure 4- 5).
  • Page 57 Chapter 4: Troubleshooting Power Supply Troubleshooting The other three groups of LEDs indicate over- voltage faults. One group is located near the center of the top edge of the backplane assembly just above the blue and red SATA cables (see Figure 4- Figure 4-6 Over-voltage indicator LEDs on backplane assembly If any of these LEDs are lit, the backplane assembly must be replaced.
  • Page 58 Chapter 4: Troubleshooting Power Supply Troubleshooting Locate the other two groups of over- voltage fault LEDs along the edges of the two acquisition assemblies. They are visible through the bottom fan opening located on the left side of the oscilloscope, nearest the rear panel (see Figure 4- 7 Figure 4- Figure 4-7 Over-voltage indicator LEDs on acquisition assembly behind fan...
  • Page 59 Chapter 4: Troubleshooting Power Supply Troubleshooting The following table shows each LED, the type of fault it indicates, and what to do if that LED indicator is illuminated. Type of Fault What To Do Group of 11 LEDs on Backplane Assembly L-ACQ TEMP FAIL Over-temperature Go to “If the L-ACQ TEMP FAIL...
  • Page 60 Chapter 4: Troubleshooting Power Supply Troubleshooting If the FP SUPPLY FAIL LED is Lit If the FP SUPPLY FAIL LED is the only one lit, there might be a problem with one of the supplies that goes to the front panel assembly, or a problem on the front panel assembly.
  • Page 61 Chapter 4: Troubleshooting Power Supply Troubleshooting plugged into the LO or COMMON input of the DVM. On a good backplane assembly, you should measure about 700 ohms. If there is a short on this board, you would measure something very near 0 ohms. 3 If there is a short, disconnect the power cable to the front panel (see Figure 4- 9) and...
  • Page 62 Chapter 4: Troubleshooting Power Supply Troubleshooting 7 If there is still a short circuit, remove both acquisition boards and unplug them from the backplane assembly. 8 Measure each assembly individually to see if there is a short between the +12V trace and ground (see Figure 4- 12).
  • Page 63 Chapter 4: Troubleshooting Power Supply Troubleshooting Figure 4-13 Measuring the backplane assembly resistance between +12V and ground across Q1409. If the MAIN FAN FAIL LED is Lit If the MAIN FAN FAIL LED is lit, the problem is a cooling system failure. Four fans are located on the left side of the oscilloscope to cool it.
  • Page 64 Chapter 4: Troubleshooting Power Supply Troubleshooting Figure 4-14 Case fans 3 Apply AC power to the oscilloscope and turn it on if it does not start up automatically. Visually check to see if any of the fans are not turning. If none of the fans are turning, it is likely a problem with the high side drive circuitry for the case fans.
  • Page 65 Chapter 4: Troubleshooting Power Supply Troubleshooting Figure 4-15 Trigger ICs fan on backplane assembly Apply AC power and turn the oscilloscope on if it does not start up on its own. Notice whether the trigger ICs fan is turning. If it is not, replace it and redo this part of the diagnostic test.

  • Page 66: Setting Up The Bios

    Chapter 4: Troubleshooting Setting Up the BIOS Setting Up the BIOS If the BIOS settings become corrupt, the Infiniium oscilloscope PC motherboard will not recognize the hard drive and the oscilloscope may not start. To configure the motherboard BIOS parameters to the default settings, follow these steps: 1 Connect the power cable to the oscilloscope.

  • Page 67: Motherboard Verification

    Chapter 4: Troubleshooting Motherboard Verification Motherboard Verification If you have been through the Power Supply Troubleshooting section of this chapter and the oscilloscope still does not stay powered up, the problem may be with the motherboard. To diagnose this problem, follow these steps. 1 Remove the handle, outer case, and top shield.

  • Page 68: Display Troubleshooting

    Chapter 4: Troubleshooting Display Troubleshooting Display Troubleshooting Figure 4-17 Display Troubleshooting Flowchart...
  • Page 69 Chapter 4: Troubleshooting Display Troubleshooting W A R N I N G SHOCK HAZARD! The backlight inverter assembly, which is mounted at the front corner of the oscilloscope near the flat- panel display, operates at 1.65 kV at turn on. DO NOT handle this assembly while it is in operation.

  • Page 70: Acquisition/Backplane Assembly Troubleshooting

    Chapter 4: Troubleshooting Acquisition/Backplane Assembly Troubleshooting Acquisition/Backplane Assembly Troubleshooting This section describes which board assembly to replace if any of the scope self tests fail. When the self- test error message file is generated it is sent to the following location: C:\ProgramData\Agilent\Infiniium\selftest\selftestlog.txt The error message usually indicates the channel with the error.

  • Page 71: Keyboard Troubleshooting

    Chapter 4: Troubleshooting Keyboard Troubleshooting Keyboard Troubleshooting Use this procedure only if you encounter key failures in the keyboard self- test procedure. If any knobs fail, replace the keyboard assembly. 1 Disconnect the power cord and remove the cover. 2 Remove the front panel assembly. See chapter 6 for instructions.

  • Page 72: Led Troubleshooting

    Chapter 4: Troubleshooting LED Troubleshooting LED Troubleshooting If you see a failure with the on/off switch backlight LED, replace the On/Off board. If the LED will still not illuminate, replace the motherboard and see if this fixes the problem. If the LED still does not work, the last option is to check the on/off cable connecting the On/Off board to the motherboard.

  • Page 73: Touch Screen Troubleshooting

    Chapter 4: Troubleshooting Touch Screen Troubleshooting Touch Screen Troubleshooting Figure 4-18 Touch screen flowchart A To find the driver, bring up the Start menu, right click Computer, then go to Manage > Device Manager > Human Interface devices and look for USB HID Touch Screen Controller.

  • Page 74: Checking Probe Power Outputs

    Chapter 4: Troubleshooting Checking Probe Power Outputs Checking Probe Power Outputs Probe power outputs are on the front panel, in the lower left corner of the 3.5mm inputs. Refer to Figure 4- 19 to check the power output at the connectors. Measure the voltages with respect to the ground terminal on the front panel, located near Aux Out.

  • Page 75: Mso Assembly Troubleshooting

    Chapter 4: Troubleshooting MSO Assembly Troubleshooting MSO Assembly Troubleshooting This section describes problems that may occur when an MSO assembly is installed, and how to troubleshoot them. The MSO printed circuit assembly is located below the lower acquisition board, with the components facing downward. LEDs on MSO Assemblies The MSO printed circuit board has two sets of LEDs.
  • Page 76 Chapter 4: Troubleshooting MSO Assembly Troubleshooting Figure 4-20 MSO cable direction...

  • Page 77: Before You Contact Keysight

    Chapter 4: Troubleshooting Before You Contact Keysight Before You Contact Keysight If you have read this Troubleshooting chapter and have unresolved questions about troubleshooting the oscilloscope, be ready to provide system information such as the current software version and installed options. This information will be useful when you contact Keysight Technologies.
  • Page 78 Chapter 4: Troubleshooting Before You Contact Keysight...
  • Page 79 ESD Precautions Tools Required To return the oscilloscope to Keysight Technologies for service To remove and replace the cover, top plate, and bottom plate To remove and replace the front panel assembly To remove and replace front panel assembly parts...

  • Page 80: Esd Precautions

    Replacing Assemblies Use the procedures in this chapter when removing and replacing assemblies and parts in the Keysight Technologies oscilloscopes. In general, the procedures are placed in the order to follow for removing a particular assembly. The procedures listed first are for assemblies that must be removed first.

  • Page 81: To Return The Oscilloscope To Keysight Technologies For Service

    Be careful to avoid contact with these leads as severe shock could result. To return the oscilloscope to Keysight Technologies for service Before shipping the oscilloscope, contact a Keysight Technologies Service Center for more details. Write the following information on a tag and attach it to the oscilloscope.

  • Page 82: To Remove And Replace The Cover, Top Plate, And Bottom Plate

    Chapter 5: Replacing Assemblies To remove and replace the cover, top plate, and bottom plate To remove and replace the cover, top plate, and bottom plate Use this procedure to remove and replace the cover, top plate, and bottom plate. When necessary, refer to other removal procedures. The pictures in this chapter are representative of the oscilloscope at the time of this printing.
  • Page 83 Chapter 5: Replacing Assemblies To remove and replace the cover, top plate, and bottom plate Remove the three M4 screws located on the top edge of the rear panel of the oscilloscope (torque to 18 in- lbs when installing), then turn the instrument on its side and remove the ten M3 screws located on the underside of the oscilloscope that attach the outer cover to the chassis (torque to 5 in- lbs when installing).
  • Page 84 Chapter 5: Replacing Assemblies To remove and replace the cover, top plate, and bottom plate Once the cover is off, you can remove the top plate by removing the three M3 screws from its rear edges and then pulling the plate toward the rear panel to dislodge the spring fingers.
  • Page 85 Chapter 5: Replacing Assemblies To remove and replace the cover, top plate, and bottom plate Figure 5-8...

  • Page 86: To Remove And Replace The Front Panel Assembly

    Chapter 5: Replacing Assemblies To remove and replace the front panel assembly To remove and replace the front panel assembly Disconnect the power cable and remove the cover, top plate, and bottom plate as described earlier. If you are removing the keyboard, grasp and pull on all knobs located on the front panel to remove them (Figure 5- 9).
  • Page 87 Chapter 5: Replacing Assemblies To remove and replace the front panel assembly Disconnect each input cable. (When reconnecting, you can determine the appropriate connections by matching the colored o- ring to the bezel color. Tighten to 8 in- lbs using a calibrated 5/16” open end torque wrench.) See Figure 5- 11.
  • Page 88 Chapter 5: Replacing Assemblies To remove and replace the front panel assembly Remove the six M3 screws that attach the side of the chassis and the front panel assembly. (Torque to 5 in- lbs when installing and the screws must be tightened in the order shown in Figure 5- 13 below.) Figure 5-13 Tilt the front panel up to see the cables connected to it.

  • Page 89: To Remove And Replace Front Panel Assembly Parts

    Chapter 5: Replacing Assemblies To remove and replace front panel assembly parts To remove and replace front panel assembly parts Remove the front panel assembly as described in the previous section. Front Panel Clutches This step will ruin the clutches. You will have to replace them with new ones. W A R N I N G Use a thin item such as a ribbon to protect the oscilloscope from scratches, and pull on the dark gray plastic clutches to pop them off of the oscilloscope.
  • Page 90 Chapter 5: Replacing Assemblies To remove and replace front panel assembly parts Disconnect the cables shown below from the board. Figure 5-16 Disengage the four tabs holding the board to the keypad as shown below. Figure 5-17 To reassemble the front panel circuit board, reverse these steps.
  • Page 91 Chapter 5: Replacing Assemblies To remove and replace front panel assembly parts Display Assembly Remove the front panel assembly and front panel bezel as described previously. Remove the inverter shield from the deck by angling it as shown below. Figure 5-18 Remove the two screws holding the display to the chassis as shown below.

  • Page 92: To Remove And Replace The Motherboard

    Chapter 5: Replacing Assemblies To remove and replace the motherboard To remove and replace the motherboard Disconnect the power cable and remove the cover and top plate as described previously. Disconnect all the cables from the motherboard (see page 106). Remove the M3 screws attaching the motherboard to the frame.

  • Page 93: To Remove And Replace The Acquisition Boards/Backplane/Optional Mso Assembly

    Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly To remove and replace the acquisition boards/backplane/optional MSO assembly The graphics in this chapter are representative of the oscilloscope at the time of this printing. Your unit may look different. Disconnect the power cable and remove the cover, top plate, and bottom plate as described previously.
  • Page 94 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Using a hand screwdriver first and then a torque driver, loosen the two screws located at the bottom of the power supply and then push the power supply to the side to disengage its connection to the backplane board.
  • Page 95 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Loosen the two screws near the motherboard / rear panel. Figure 5-26 Turn the oscilloscope upside down and remove the SMA connections to the bottom of the backplane board (Figure 5- 27). When reconnecting, route these cables underneath the input cables.
  • Page 96 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Disconnect the two semi- rigid Cal Out/Aux Out cables from both the front panel and backplane board. As Figure 5- 28 shows, first disconnect the cables from the rear side of the Cal Out / Aux Out connections and then pull straight back to remove the cables from the backplane board.
  • Page 97 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Remove the attenuator power cable from each input channel attenuator and route the cable through the grommet in the backplane (Figure 5- 30). The attenuators are keyed to match the connectors. Figure 5-30 Remove this connection from each channel attenuator and then route the entire cable through the backplane board...
  • Page 98 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Remove the two M4 screws from top of the backplane board and two M4 screws from the rear of the instrument as shown below. The bottom photo shows the rear screws with the optional MSO assembly.
  • Page 99 Chapter 5: Replacing Assemblies To remove and replace the acquisition boards/backplane/optional MSO assembly Figure 5- 34 and Figure 5- 35 show the removed assemblies, with and without the optional MSO assembly. Figure 5-34 digital channels (MSO) board acquisition boards backplane board Figure 5-35 backplane board acquisition boards...

  • Page 100: To Remove The Backplane Assembly From The Acquisition/Optional Mso Assembly

    Chapter 5: Replacing Assemblies To remove the backplane assembly from the acquisition/optional MSO assembly To remove the backplane assembly from the acquisition/optional MSO assembly Remove the entire acquisition/backplane/optional MSO assembly as described in the previous section. Remove the four M4 screws (two per acquisition assembly) on the side of the backplane assembly (Figure 5- 36).
  • Page 101 Chapter 5: Replacing Assemblies To remove the backplane assembly from the acquisition/optional MSO assembly Use the handles on the acquisition tray to separate the backplane assembly from each of the acquisition assemblies, and remove the MSO assembly on MSO models. This step requires some force as the assemblies have numerous connections and pins.
  • Page 102 Chapter 5: Replacing Assemblies To remove the backplane assembly from the acquisition/optional MSO assembly The semi- rigid cable shown in Figure 5- 39 must be installed correctly. Figure 5-39 Figure 5-40 To reassemble the backplane/acquisition assembly, reverse these instructions.

  • Page 103: To Set The Calibration Factors After Replacing The Acquisition Board

    Chapter 5: Replacing Assemblies To set the calibration factors after replacing the acquisition board To set the calibration factors after replacing the acquisition board The calibration/self test procedure must be performed after replacing the acquisition board. Consult the calibration chapter in this service guide. Let the oscilloscope warm up before testing or calibrating.

  • Page 104: To Remove And Replace The Hard Disk Drive

    Chapter 5: Replacing Assemblies To remove and replace the hard disk drive To remove and replace the hard disk drive Use this procedure to remove and replace the hard disk drive. When necessary, refer to other removal procedures. The graphics in this chapter are representative of the oscilloscope at the time of this printing.
  • Page 105 Chapter 5: Replacing Assemblies To remove and replace the hard disk drive With the hard disk drive and its frame removed, you can remove the hard disk drive from the frame by removing the four screws shown in Figure 5- 43. Figure 5-43 To replace the hard disk drive, reverse this procedure.

  • Page 106: Cable Removal (For Replacing The Motherboard)

    Chapter 5: Replacing Assemblies Cable removal (for replacing the motherboard) Cable removal (for replacing the motherboard) This section shows the various cables that need to be removed when replacing the motherboard. Disconnect the power cable and remove the top cover. Disconnect all cables from the motherboard.
  • Page 107 Chapter 5: Replacing Assemblies Cable removal (for replacing the motherboard) Figure 5- 45 shows the cables connected to the backplane board as viewed from the rear of the oscilloscope. Figure 5-45...

  • Page 108: To Remove And Replace The Power Supply

    Chapter 5: Replacing Assemblies To remove and replace the power supply To remove and replace the power supply Use this procedure to remove and replace the power supply. When necessary, refer to other removal procedures. The graphics in this chapter are representative of the oscilloscope at the time of this printing.

  • Page 109: To Remove And Replace The Fans

    Chapter 5: Replacing Assemblies To remove and replace the fans To remove and replace the fans W A R N I N G AVOID INJURY! The fan blades are exposed both inside and outside the chassis. Disconnect the power cable before working around the fan. Use extreme caution in working with the oscilloscope to avoid injury.

  • Page 110: To Remove And Replace The Usb Or Gpib Port

    Chapter 5: Replacing Assemblies To remove and replace the USB or GPIB port To remove and replace the USB or GPIB port Use this procedure to remove and replace the USB or GPIB port (GPIB is an option and may not be on your oscilloscope). The procedure is exactly the same for both of these ports so only one will be shown here.
  • Page 111 Ordering Replaceable Parts Listed Parts Unlisted Parts Direct Mail Order System Exchange Assemblies Exploded Views Replaceable Parts List Replaceable Parts...
  • Page 112 Ordering Replaceable Parts Listed Parts To order a part in the parts list, quote the Keysight Technologies part number, indicate the quantity desired, and address the order to the nearest Keysight Technologies Sales Office. Unlisted Parts...
  • Page 113 Chapter 6: Replaceable Parts Exploded Views Exploded Views Front Frame and Front Panel...
  • Page 114 Chapter 6: Replaceable Parts Exploded Views Fan and Acquisition Assembly...
  • Page 115 Chapter 6: Replaceable Parts Exploded Views Power Supply and PC Motherboard...
  • Page 116 Chapter 6: Replaceable Parts Exploded Views Sleeve...
  • Page 117 The following table is a list of replaceable parts. Information given for each part includes: • Reference designation in exploded views • Keysight Technologies part number • Total quantity (QTY) in the oscilloscope or an assembly • Description of the part Replaceable Parts Ref.
  • Page 118 Chapter 6: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Keysight Part Des. Number Description 54916-66722 Backplane PCA for MSOX Infiniium products - tested 54916-69722 Backplane PCA for MSOX Infiniium products - Exchange 54913-68710 Fan Replacement Kit 120 MM 54916-00103...
  • Page 119 Chapter 6: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Keysight Part Des. Number Description 54916-07101 Input Connector Ground Spring 54916-42201 Bezel 54916-42001 Casting - Probe Mate 54913-94300 Colored Knob Labels MP10 54916-47411 Knob 12 mm slate gray MP11 54916-47412...
  • Page 120 Chapter 6: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Keysight Part Des. Number Description 54916-61637 Cable - Autoprobe 54916-61619 Cable - SR Oscillator Reference 54916-61626 Cable - Calibration 54916-61628 Cable - SMA/SMB Vertical 0.3 m 7120-6153 Label - ground...
  • Page 121 Motherboard Assembly Acquisition Assembly Backplane Assembly Front Panel Assembly Power Supply Assembly MSO Assembly Theory of Operation...
  • Page 122 Chapter 7: Theory of Operation Figure 7-1 Oscilloscope block diagram...
  • Page 123 Theory of Operation This chapter describes the basic structure of the oscilloscope and how the parts interact. The oscilloscopes are comprised of five or six main assemblies, depending on the model of the oscilloscope: a motherboard assembly, an acquisition assembly, a backplane assembly, a front panel assembly, and a power supply assembly for all models, plus a Mixed Signal Oscilloscope (MSO) assembly for all MSO models.

  • Page 124: Motherboard Assembly

    Chapter 7: Theory of Operation Motherboard Assembly Motherboard Assembly The motherboard provides all system control and interface functions for the oscilloscope. The motherboard contains a microprocessor, a hard disk drive interface, ROM, RAM, keyboard and mouse interfaces, connections to the front panel board, and serial interfaces.

  • Page 125: Acquisition Assembly

    Chapter 7: Theory of Operation Acquisition Assembly Acquisition Assembly The acquisition assembly consists of two identical acquisition boards. These two boards connect to the backplane board as shown in Figure 7- 2. Figure 7-2 Acquisition and backplane assemblies The upper acquisition board circuitry samples, digitizes, and stores the signals for channels 3 and 4;...
  • Page 126 Chapter 7: Theory of Operation Acquisition Assembly Figure 7-3 Oak module and acquisition components The acquisition front end starts at the front panel input connectors, then goes through the attenuators, cabling, and Oak module. The differential outputs from Oak then go into one differential input pair of the ADC. Each ADC has two sets of differential inputs.

  • Page 127: Backplane Assembly

    Chapter 7: Theory of Operation Backplane Assembly Backplane Assembly The backplane assembly is a device on the PCI Express (PCIe) bus connected by two SATA cables to the motherboard. The backplane assembly receives +12V DC power through a power interface board from the bulk supply, and all voltages are derived from switching power regulators and other circuitry.
  • Page 128 Chapter 7: Theory of Operation Backplane Assembly Main FPGA The main FPGA (field- programmable gate array) is the only communication link from the oscilloscope hardware to the PC system. All system controls and data pass through the main FPGA. Figure 7- 5 shows the connections to the main FPGA.
  • Page 129 Chapter 7: Theory of Operation Backplane Assembly one bus connects to each of the two acquisition boards. A separate bus for each FPGA minimizes timing problems and reflections. The FPGAs on the acquisition assemblies are used to control the oscilloscope functions on each of those assemblies. On power- up, after the PC software recognizes the two acquisition assemblies, it loads the trigger FPGA and the acquisition FPGAs using these buses.
  • Page 130 Chapter 7: Theory of Operation Backplane Assembly inner layers of the PCB. The Wahoo timebase IC divides the 10 GHz CW clock down into multiple 1 GHz and 250 MHz clocks. The 1 GHz DigClk clocks are gated by DigRun so that the ADCs can be synchronized with each other.
  • Page 131 Chapter 7: Theory of Operation Backplane Assembly Figure 7-7 10 GHz clock generation The external 10 MHz reference is applied through a rear- panel BNC connector and runs to the backplane assembly. Users can select between an internal and external reference through a dialog box in the oscilloscope application. A detector circuit consisting of a detector diode and a non- inverting op- amp gain stage followed by a window comparator ensures the user supplies a 10 MHz signal of the correct amplitude (- 5 dBm minimum to +10 dBm maximum).

  • Page 132: Front Panel Assembly

    Chapter 7: Theory of Operation Front Panel Assembly Front Panel Assembly The front panel assembly consists of a front panel board, on/off board, display board, touch screen and controller, AutoProbe II interface board for probe power and probe control, backlight inverter board, front panel connectors, and cabling connectors for the AutoProbe II interface.

  • Page 133: Power Supply Assembly

    Chapter 7: Theory of Operation Power Supply Assembly Power Supply Assembly The power supply assembly consists of a power interface board and a bulk +12V power supply. The power interface board does filtering and provides 60 Hz line trigger to the oscilloscope.

  • Page 134: Mso Assembly

    Chapter 7: Theory of Operation MSO Assembly MSO Assembly The MSO assembly consists of a printed circuit assembly that fits below the lower acquisition board. It provides digital channel capability. Figure 7- 9 shows the circuitry of the MSO board. Figure 7- 10 shows how the FPGA on the MSO board communicates with the Main FPGA on the backplane board.
  • Page 135 • Capacitors inside the instru- ment may retain a charge even if the instrument is disconnected from its source of supply. Keysight Technologies P.O. Box 2197 1900 Garden of the Gods Road Colorado Springs, CO 80901...
  • Page 136 Manual Part Number fitness for a particular pur- 54916-97010, May 2015 pose. Keysight shall not be CAUTION liable for errors or for inci- Print History dental or consequential dam- A CAUTION notice...

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