Keysight Infiniium 90000A Series Service Manual
Keysight Infiniium 90000A Series Service Manual

Keysight Infiniium 90000A Series Service Manual

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5 0 0 C e n t r a l A v e .
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Summary of Contents for Keysight Infiniium 90000A Series

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Keysight Infiniium 90000A Series Oscilloscopes Service Guide...
  • Page 3 Accordingly, Manual Part Number to the product or loss of important Keysight provides the Software to U.S. gov- ernment customers under its standard com- data. Do not proceed beyond a CAU- 54913-97030...
  • Page 4: Table Of Contents

    Troubleshooting Overview / 48 Verifying Basic Operation / 49 Power Up the oscilloscope / 49 Run the oscilloscope self tests / 50 Run the keyboard, LED, and touch screen self tests / 50 Keysight Infiniium 90000A Series Oscilloscopes Service Guide...
  • Page 5 5 Replacing Assemblies Replacing Assemblies / 80 Returning the oscilloscope to Keysight Technologies for service / 82 Removing and replacing the cover, top plate, and bottom plate / 83 Removing and replacing the front panel bezel and front panel circuit assembly / 88...
  • Page 6 Removing and replacing the USB or GPIB port / 117 6 Replaceable Parts Ordering Replaceable Parts / 120 Exploded Views / 121 Replaceable Parts List / 125 7 Theory of Operation Block-Level Theory / 133 Keysight Infiniium 90000A Series Oscilloscopes Service Guide...
  • Page 7 Keysight Infiniium 90000A Series Oscilloscopes Service Guide...
  • Page 8 1 General Information Instruments Covered by this Service Guide / 8 Performance-Enhanced Versus Standard Models / 9 Accessories Supplied / 9 Specifications and Characteristics / 10 Oscilloscope Dimensions / 12 For technical assistance, contact your local Keysight Technologies representative at http://www.keysight.com/find/contactus.
  • Page 9: General Information

    The release date of this manual is shown on the back of the title page. 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after the release of this manual, please check the Keysight Technologies website at www.keysight.com to see whether a newer version of this manual is available.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 10: Performance-Enhanced Versus Standard Models

    General Information Performance-Enhanced Versus Standard Models In the fall of 2000, Keysight started shipping performance-enhanced models of the 90000A Series oscilloscope. This service guide covers both the standard and performance-enhanced versions. Any differences between the two versions are noted. To tell whether the oscilloscope you have is a standard one or a performance-enhanced version, check whether it has one handle or two handles.
  • Page 11: Specifications And Characteristics

    General Information Specifications and Characteristics The following table contains a partial list of specifications and characteristics for the Keysight Infiniium 90000A Series oscilloscopes. For a complete list, see the data sheet at www.keysight.com/find/90000. Environment Indoor use only Ambient temperature Operating: 5 °C to +40 °C Non-operating: –40 °C to +65 °C...
  • Page 12 The mains plug shall be inserted only in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous. Intentional interruption is prohibited. Keysight Infiniium 90000A Series Service Guide...
  • Page 13: Oscilloscope Dimensions

    General Information Oscilloscope Dimensions The following pictures show the dimensions of the 90000A Series oscilloscope. Keysight Infiniium 90000A Series Service Guide...
  • Page 14: Calibration

    Keysight Infiniium 90000A Series Oscilloscopes Service Guide 2 Calibration What Is a Calibration? / 14 Running a User Calibration / 15...
  • Page 15: What Is A Calibration

    It can include a time scale calibration. • A service calibration is performed only by Keysight Service Center technicians. The following section describes how to run a user calibration.
  • Page 16: Running A User Calibration

    Keysight 53131A with opt. (required for time scale calibration) Calibration time It takes approximately 1 hour to run the user calibration on the oscilloscope, including the time required to change cables from channel to channel. Keysight Infiniium 90000A Series Service Guide...
  • Page 17: Procedure

    1 that meets the following specifications. Failure to use a reference signal that meets these specifications will result in an inaccurate calibration. Frequency: 10 MHz ±0.4 ppm = 10 MHz ±4 Hz Amplitude: 0.2 Vpeak-to-peak to 5.0 Vpeak-to-peak Wave shape: Sine or Square Keysight Infiniium 90000A Series Service Guide...
  • Page 18 A Passed/Failed indication appears for each calibration section. If any section fails, click the Enable Details box for information on the failures. Also check the calibration cables and run the oscilloscope self tests. Keysight Infiniium 90000A Series Service Guide...
  • Page 19 Calibration Keysight Infiniium 90000A Series Service Guide...
  • Page 20: Testing Performance

    Keysight Infiniium 90000A Series Oscilloscopes Service Guide 3 Testing Performance Verifying System Performance / 20 Vertical Performance Verification / 21 Offset Accuracy Test / 22 DC Gain Accuracy Test / 28 Analog Bandwidth—Maximum Frequency Test / 32 Time Scale Accuracy (TSA) Test / 39...
  • Page 21: Verifying System Performance

    The procedures are written to minimize the number and types of equipment and accessories required. The test equipment in these lists are currently available for sale by Keysight at the time this document was written. In some cases, the test procedures use features specific to the test equipment in the recommended equipment list.
  • Page 22: Vertical Performance Verification

    Testing Performance Vertical Performance Verification This section describes the following vertical performance verification tests: • Offset Accuracy Test • DC Gain Accuracy Test • Analog Bandwidth Test • Time Scale Accuracy Test Keysight Infiniium 90000A Series Service Guide...
  • Page 23: Offset Accuracy Test

    Zero Error Test Procedure Disconnect all cables from the oscilloscope channel inputs. Click Control > Factory Default. Click Setup > Acquisition..In the Acquisition dialog box, enable averaging and set # of Averages to 256. Keysight Infiniium 90000A Series Service Guide...
  • Page 24 Change the vertical scale of channel 1 to 5 mV/div. Click the Vertical Meas tab on the left side of the waveform window, then drag and drop the Average measurement icon onto the channel 1 waveform. Average measurement (V avg) Keysight Infiniium 90000A Series Service Guide...
  • Page 25 Offset Accuracy—Zero Error Test section of the Performance Test Record. Repeat steps 9b and 10 for the remaining vertical scale settings for channel 2. Repeat steps 8 through 11 for channels 3 and 4. Keysight Infiniium 90000A Series Service Guide...
  • Page 26 • 256 averages are used in the oscilloscope measurements of this section to reduce measurement noise and to reduce the measurement error due to resolution. Set up the DMM to perform DC voltage measurements. Keysight Infiniium 90000A Series Service Guide...
  • Page 27 256, and then record the DMM voltage reading as V and the DMM0 scope V avg reading as V in the Offset Accuracy—Offset Gain Test section Scope0 of the Performance Test Record. Keysight Infiniium 90000A Series Service Guide...
  • Page 28 Offset Accuracy—Offset Gain Test table in the Performance Test Record for each of the vertical scale settings. Move the Tee connector to the next channel input and repeat steps 4 to 14 for channels 2 to 4. Keysight Infiniium 90000A Series Service Guide...
  • Page 29: Dc Gain Accuracy Test

    DC voltage measurement accuracy better than Keysight 34401A ±0.1% of reading Cable Assembly 50 Ω characteristic impedance, BNC (m) Keysight 8120-1840 (2 required) connectors Adapter BNC Tee (m)(f)(f) Keysight 1250-0781 Adapter BNC (f) to dual banana Keysight 1251-2277 Keysight Infiniium 90000A Series Service Guide...
  • Page 30 • It also helps to reduce ground potential differences if the oscilloscope and DMM are connected to the same AC supply circuit. • 256 averages are used in the oscilloscope measurements of this section to reduce measurement noise and to reduce the measurement error due to resolution. Keysight Infiniium 90000A Series Service Guide...
  • Page 31 Display] on the oscilloscope, wait for the number of averages to return to 256, and then record the oscilloscope reading. The question mark indicates that the oscilloscope could not make a reliable measurement. Record the Mean reading Change the Aux Out voltage to -15 mV. Keysight Infiniium 90000A Series Service Guide...
  • Page 32 Test table in the Performance Test Record for each of the vertical scale settings. Move the Tee connector to the next channel input and repeat steps 2 to 10 for channels 2 to 4. Keysight Infiniium 90000A Series Service Guide...
  • Page 33: Analog Bandwidth-Maximum Frequency Test

    3.5 mm (m) to 3.5 mm (m) connectors Max Frequency ≥ 18 GHz SMA Adapters 3.5 mm (m) to 3.5 mm (m) SMA) E2655-83202 SMA to BNC 3.5 mm (f) SMA to Precision BNC (no 54855-67604 Adapter substitute) Keysight Infiniium 90000A Series Service Guide...
  • Page 34 Connect the power sensor to the power meter's Power Ref connector and calibrate the meter. Make the connections to oscilloscope channel 1 as shown in the preceding connection diagram. Set up the power meter to display measurements in units of Watts. Keysight Infiniium 90000A Series Service Guide...
  • Page 35 Click Measure > Add Measurement..In the Add Measurement dialog box, select the Vertical RMS measurement and configure it as follows: • Source = Channel 1 • Measurement Area = Entire Display • RMS Type = AC Keysight Infiniium 90000A Series Service Guide...
  • Page 36 Test Record (Vout @ 50 MHz). For all oscilloscope readings in this procedure, use the mean value in the Results area at the N OTE bottom of the screen. Calculate the reference gain as follows: Keysight Infiniium 90000A Series Service Guide...
  • Page 37 Analog Bandwidth—Maximum Frequency Check section of the Performance Test Record (Vout @ Max Freq). Calculate the gain at the maximum frequency using the expression: ⁄ out Max Freq in Max Freq ----------------------------------------------------------------------------------- - 20 log Gain Max Freq Gain 50 MHz Keysight Infiniium 90000A Series Service Guide...
  • Page 38 Click Measure > Add Measurement..Select the RMS voltage measurement, Channel 2 as the source, Entire Display as the Measurement Area, and AC for the RMS Type. Repeat steps 7 to 20 to complete measuring gains for channel 2. Keysight Infiniium 90000A Series Service Guide...
  • Page 39 Click Measure > Add Measurement..Select the RMS voltage measurement, Channel 4 as the source, the Entire Display as the Measurement Area, and AC for the RMS Type. Repeat steps 7 to 20 to complete measuring gains for channel 4. Keysight Infiniium 90000A Series Service Guide...
  • Page 40: Time Scale Accuracy (Tsa) Test

    Keysight service center. The aging component scales linearly from the time since the last time base calibration, and adds to the initial accuracy component.
  • Page 41 Enter 20 mV in the Hysteresis field and 0 V in the Threshold Level field. Enable a frequency measurement on channel 1. On the oscilloscope, press [Stop]. Press [Clear Display]. Press [Run], wait until 10 acquisitions have accumulated, and then press [Stop]. Keysight Infiniium 90000A Series Service Guide...
  • Page 42 Calibration window (Utilities > Calibration...). Calculate the test limits using the following formula and record them in the table. Test Limits = ±(0.4 + 0.5 x Years Since Calibration) Record the results in the Performance Test Record. Keysight Infiniium 90000A Series Service Guide...
  • Page 43: Performance Test Record

    50 mV/div -5.0 mV to +5.0 mV 100 mV/div -9.0 mV to +9.0 mV 200 mV/div -17.0 mV to +17.0 mV 500 mV/div -41.0 mV to +41.0 mV 1 V/div -81.0 mV to +81.0 mV Keysight Infiniium 90000A Series Service Guide...
  • Page 44 5 mV/div ±400 mV 10 mV/div ±400 mV ±2% 20 mV/div ±400 mV ±2% 50 mV/div ±900 mV ±2% 100 mV/div ±1.6 V ±2% 200 mV/div ±2.4 V ±2% 500 mV/div ±2.4 V ±2% Keysight Infiniium 90000A Series Service Guide...
  • Page 45 10 mV/div ±30 mV ±2% 20 mV/div ±60 mV ±2% 50 mV/div ±150 mV ±2% 100 mV/div ±300 mV ±2% 200 mV/div ±600 mV ±2% 500 mV/div ±1.5 V ±2% 1 V/div ±2.4 V ±2% Keysight Infiniium 90000A Series Service Guide...
  • Page 46 5 mV/div 10 mV/div 20 mV/div 50 mV/div 100 mV/div 200 mV/div 500 mV/div 1 V/div Channel 4 5 mV/div 10 mV/div 20 mV/div 50 mV/div 100 mV/div 200 mV/div 500 mV/div 1 V/div Keysight Infiniium 90000A Series Service Guide...
  • Page 47 Testing Performance Time Scale Accuracy Measured Time Scale Years Since Calibration Low Test Limit High Test Limit Pass/Fail (years) (ppm) (ppm) Error (ppm) ___________ ___________ ___________ ___________ ___________ Keysight Infiniium 90000A Series Service Guide...
  • Page 48: Troubleshooting

    Setting Up the BIOS / 71 Acquisition/Backplane Assembly Troubleshooting / 72 AutoProbe Board Troubleshooting / 73 Keyboard Troubleshooting / 74 LED Troubleshooting / 75 Touch Screen Troubleshooting / 76 Checking Probe Power Outputs / 77 Before You Contact Keysight / 78...
  • Page 49: Troubleshooting Overview

    Troubleshooting Troubleshooting Overview The service strategy for troubleshooting Infiniium 90000A Series oscilloscopes is to isolate problems to a faulty assembly, then use the disassembly and assembly procedures in Chapter 5, “Replacing Assemblies”, to replace the defective assembly. Read the For Your Safety booklet before servicing the oscilloscope. Before performing any procedure, review it for any cautions and warnings.
  • Page 50: Verifying Basic Operation

    If the oscilloscope turns off without you pressing the front panel power button, go to the “Power Supply Troubleshooting” section of this chapter. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 51: Run The Oscilloscope Self Tests

    Press each key on the keyboard until you have pressed all keys. When you press a key or push a knob, the bar above the corresponding key/knob symbol on the display should change from red to green. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 52 LED symbol in the test screen. You can also step through the LEDs by pressing the <<Prev or Next>> buttons on the display screen. Verify that the corresponding LEDs on the front panel are the only ones illuminated. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 53: Run A User Calibration

    Verify system performance After you have verified the basic operation of the oscilloscope, you need to verify that it meets all warranted specifications by following the procedures in the “Testing Performance” chapter. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 54: Power Supply Troubleshooting

    If the scope never powers up, or shuts off almost immediately, go to the “Over-voltage fault” section in this chapter. If all the steps within these sections have been followed and the oscilloscope still does not turn on, go to the “Motherboard verification” section of this chapter. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 55: Under-Voltage Fault

    • If BP POL FAIL, NEG SUPPLY FAIL, or FPGA SUPPLY FAIL is lit, replace the backplane assembly. • If only the FP SUPPLY FAIL LED is lit, go to the next section, “If the FP SUPPLY FAIL LED is lit”. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 56 Keysight Infiniium 90000 A-Series Service Guide...
  • Page 57 700 ohms. If there is a short on this board, you would measure something very near zero ohms. Measuring the backplane resistance between +12 V and ground across Q1409 Keysight Infiniium 90000 A-Series Service Guide...
  • Page 58 Make sure you make the measurement using a DVM with the red lead plugged into the HI input and the black lead plugged into the LO or COMMON input of the DVM. If there is a short between these two traces, the Keysight Infiniium 90000 A-Series Service Guide...
  • Page 59 Once the faulty board or switch is discovered, be sure to reinstall all other parts that were removed, as they were not the cause of the problem. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 60: Over-Temperature Fault

    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. In that case, replace the backplane assembly. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 61 • If any of the case fans were turning and the trigger ICs fan was turning, the problem is most likely that the rotation sensor on the ICs fan is defective. Replace the trigger ICs fan and redo this part of the diagnostic test. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 62 It is also possible for one of the heat sinks on one of the acquisition assemblies’ critical parts to become detached and cause that part to overheat and shut down the instrument. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 63: Over-Voltage Fault

    The other two groups of LEDs that indicate over-voltage faults are located along the edges of the two acquisition assemblies and are visible through the bottom fan opening located on the left side of the oscilloscope, nearest the rear panel. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 64 2 acquisition assembly and the one above it is the channels 3 and 4 acquisition assembly. If you look through the fan and see any of these over-voltage LEDs illuminated, that acquisition assembly needs to be replaced. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 65: Display Troubleshooting

    Display on sequence Done. oscilloscope? Power-up Go to “Checking the displayed on ext. Backlight Inverter monitor Voltages” Check the display board video signals Display on Done. oscilloscope? Go to “Verifying Basic Operation” 54830F02a Keysight Infiniium 90000 A-Series Service Guide...
  • Page 66: Checking The Backlight Inverter Voltages

    The outputs are controlled by the input. Notice that input pin 5 goes low to enable the output voltage. These pins can be reached at J1 on the display board MP12. Backlight inverter board input voltage Input pin # Backlight OFF Backlight ON 2.5 V 12 V 12 V Keysight Infiniium 90000 A-Series Service Guide...
  • Page 67: Checking The Display Board Video Signals

    A3 are Low Voltage Differential Signals (LVDS). Video Signals Pin Number Signal Pin Number Signal CLK- (LVDS pair) CLK+ GROUND (LVDS pair) GROUND (LVDS pair) GROUND (LVDS pair) GROUND (LVDS pair) GROUND GROUND +3.3 V +3.3 V +3.3 V Keysight Infiniium 90000 A-Series Service Guide...
  • Page 68: Front Panel Display Troubleshooting

    Try a golden display card to verify failure Replace voltage display card Does display work with golden card? Replace display Replace LCD card Does front panel Replace Replace LCD display inverter work? Go to “Verifying Basic Operation” Keysight Infiniium 90000 A-Series Service Guide...
  • Page 69 If the procedure requires you to have the cover off, be careful not to contact these fan blades with any part of your body. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 70: Motherboard Verification

    Measure the potential relative to the chassis at pin 9 of J1201 again. If you measure the required 3.3 V, the motherboard is defective and needs to be replaced. If you did not measure the correct voltage, the backplane assembly is defective and must be replaced. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 71 9 contact in the connector that plugs into J1201. If you measure a very low resistance or a short circuit to the chassis, replace the motherboard and then assemble the instrument and confirm the unit beeps and boots up properly. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 72: Setting Up The Bios

    Go to F3 Optimized Defaults and press [Enter]. Select Yes to load the defaults, then press [Enter]. Go to the Save and Exit Setup option and press [Enter], to save and exit the setup. Select Yes, then press [Enter]. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 73: Acquisition/Backplane Assembly Troubleshooting

    Upper acquisition Hedwig7, Hedwig8 Misc. Scope Temp Sensor Hedwig0, Hedwig1, Lower acquisition Hedwig2, Hedwig3, Oak0 Hedwig4, Hedwig5, Upper acquisition Hedwig6, Hedwig7, Oak2 Pred1, Pred2, MainFPGA Backplane Acq Flash RAM Test is not currently being run. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 74: Autoprobe Board Troubleshooting

    AutoProbe Board Troubleshooting AutoProbe Board Trouble Isolation Inspect the cable between the AutoProbe assembly and the power board Cable Replace bad cable Turn unit on Does Replace unit turn AutoProbe assembly Go to “Verifying Basic Operation” Keysight Infiniium 90000 A-Series Service Guide...
  • Page 75: Keyboard Troubleshooting

    • If the display responds as though a key were pressed, replace the elastomeric keypad. • If the display does not respond as though a key were pressed, replace the keyboard. Re-assemble the oscilloscope. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 76: Led Troubleshooting

    LEDs will illuminate. If the LEDs do not illuminate, the last step is to reload the oscilloscope software. When reassembling the oscilloscope, be sure to reinstall all boards that were replaced, but that were not causing the problem. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 77: Touch Screen Troubleshooting

    Press Touch key Perform Touch Screen Test Did test pass? Is USB front/ Replace touch cable USB cable damaged? Replace Do knobs and display/touch keys work? screen Does touch Done screen work? Replace motherboard Keysight Infiniium 90000 A-Series Service Guide...
  • Page 78: Checking Probe Power Outputs

    Probe ID –12 V +12 V Any failure is likely caused by a problem with the probe power and control assembly, the AutoProbe flex cable, the probe power and control cable, or the power board. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 79: Before You Contact Keysight

    Click Help > About Infiniium..A dialog box similar to this one appears. Click Copy to Clipboard. Bring up a text editor, such as Notepad, and paste the copied information into the editor. Save the text editor file. Keysight Infiniium 90000 A-Series Service Guide...
  • Page 80: Replacing Assemblies

    Service Guide 5 Replacing Assemblies Returning the oscilloscope to Keysight Technologies for service / 82 Removing and replacing the cover, top plate, and bottom plate / 83 Removing and replacing the front panel bezel and front panel circuit assembly / 88...
  • Page 81: Replacing Assemblies

    Replacing Assemblies Use the procedures in this chapter when removing and replacing assemblies and parts in the Infiniium 90000A Series oscilloscopes. The pictures in this chapter are representative of the oscilloscope at the time of this printing. Your unit may look different.
  • Page 82 Allow all residual alcohol moisture to evaporate, and the fumes to dissipate prior to powering up the oscilloscope. Dispose of the cleaning materials in a responsible manner. Keysight Infiniium 90000A Series Service Guide...
  • Page 83: Returning The Oscilloscope To Keysight Technologies For Service

    Replacing Assemblies Returning the oscilloscope to Keysight Technologies for service Before shipping the oscilloscope, contact Keysight Technologies for more details. Write the following information on a tag and attach it to the oscilloscope. • Name and address of owner •...
  • Page 84: Removing And Replacing The Cover, Top Plate, And Bottom Plate

    Remove the two Torx T20 screws securing each side handle. Standard models have one handle; performance-enhanced models have two handles. Remove the 6 Torx T20 screws that secure the rear feet (three in each foot). Keysight Infiniium 90000A Series Service Guide...
  • Page 85 Torx T10 screws from the underside of the oscilloscope that attach the cover to the chassis. Carefully slide the cover toward the rear of the instrument and off the chassis. Keysight Infiniium 90000A Series Service Guide...
  • Page 86 Replacing Assemblies Once the cover is removed, you can remove the top plate by removing the 12 Torx T10 screws from its edges. Then pull back on the top plate and lift it off. Keysight Infiniium 90000A Series Service Guide...
  • Page 87 To remove the bottom plate, flip the oscilloscope upside down and remove the three Torx T20 screws from the bottom panel. Then remove the 3 Torx T20 screws from the bottom edge of the rear panel. Slide the bottom panel up and out. Keysight Infiniium 90000A Series Service Guide...
  • Page 88 PROPERLY TIGHTEN HANDLE AND SCREWS! Tighten the side handle screws to 2.4 Nm CAUTION (21 in-lbs). Keysight Infiniium 90000A Series Service Guide...
  • Page 89: Removing And Replacing The Front Panel Bezel And Front Panel Circuit Assembly

    Use a screwdriver to disengage the locking tabs located along the edges of the front panel bezel. For best results, disengage the four side tabs first, then the top tab, and then pull the bezel off at an angle and flex it until the bottom tab disengages. Keysight Infiniium 90000A Series Service Guide...
  • Page 90 Replacing Assemblies Remove two Torx T10 screws from the front panel assembly. Keysight Infiniium 90000A Series Service Guide...
  • Page 91 You can see the top left side tab by looking through the top cavity, and the bottom left tab by turning the oscilloscope on its side and looking through the bottom cavity. Keysight Infiniium 90000A Series Service Guide...
  • Page 92 Once they are attached together, snap down the right side tabs first and then the left tabs. Keysight Infiniium 90000A Series Service Guide...
  • Page 93: Removing And Replacing The On/Off Board

    Remove the Torx T10 screw from the on/off board. Pull the board out a little so you can see the cables connected behind it. Disconnect these cables and then take the board off. To replace the on/off board, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 94: Removing And Replacing The Backlight Inverter Board

    Disconnect the cables from the backlight inverter board. Remove two Torx T20 screws that connect the board to the chassis. Lift the backlight inverter board out through the top of the chassis. To replace the backlight inverter board, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 95: Removing And Replacing The Touch Screen, Front Deck, And Controller Assembly

    Pull the touch screen off. Keysight Infiniium 90000A Series Service Guide...
  • Page 96 (two on the right side and two on the left side). Turn the oscilloscope upside down or on its side and look through the bottom cavity to see the SMA connectors attached to the front deck. Remove these SMA connectors with a wrench. Keysight Infiniium 90000A Series Service Guide...
  • Page 97 N OTE deck. This gives you some room to feed cables through the correct holes and attach them to the correct boards. When reattaching the SMA cables, use an 8-lb. torque wrench as shown below. Keysight Infiniium 90000A Series Service Guide...
  • Page 98 Viewing these with line-of-sight 45 degrees to the surface is the best method for seeing subtle flaws. Clean the surfaces of the touch screen with glass cleaner and lint-free lens paper before re-assembly. Keysight Infiniium 90000A Series Service Guide...
  • Page 99: Removing And Replacing The Motherboard

    Pull the motherboard toward the front panel and then lift out. To reassemble the motherboard, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 100 The motherboard has a Rayovac BR2032 lithium battery, shown below. Danger of WARNING explosion if battery is incorrectly replaced. Replace only with the same or alternate type recommended. Discard used batteries according to manufacturer’s instructions. Lithium battery Keysight Infiniium 90000A Series Service Guide...
  • Page 101: Removing And Replacing The Acquisition Boards/Backplane Assembly

    Turn the oscilloscope on its side and remove the SMAs connected to the bottom of the backplane board. Disconnect the BNCs from the rear of the instrument using a 9/16-inch open- ended or socket wrench. Keysight Infiniium 90000A Series Service Guide...
  • Page 102 (underneath where the motherboard used to be). Remove the Torx T20 screws from the top of the backplane assembly. Flip the instrument so it is upside down or on its side. Keysight Infiniium 90000A Series Service Guide...
  • Page 103 Replacing Assemblies Remove the Torx T20 screws from lower side of the rear of the instrument. Remove the two Torx T20 screws from the underside of the backplane assembly. Keysight Infiniium 90000A Series Service Guide...
  • Page 104 Replacing Assemblies If unit is not already upside down, flip it upside down now. Then lift the entire acquisition boards/backplane assembly out of the instrument using the handles on the bottom. Keysight Infiniium 90000A Series Service Guide...
  • Page 105: Removing The Backplane Assembly From The Acquisition Assemblies

    Gently pry on the sheet metal portions to separate the backplane assembly from each of the acquisition assemblies. Remove the Torx T10 screws to remove each of the boards from their respective subassembly chassis. To reassemble the backplane/acquisition assembly, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 106: Setting The Calibration Factors After Replacing The Acquisition Board

    Setting the calibration factors after replacing the acquisition board The following procedure must be performed after replacing an acquisition board. Only trained Keysight service personnel should perform this level of calibration. Let the oscilloscope warm up before running the calibration.
  • Page 107 Baud Rate: 9600 Baud Parity: None: 8 bits Language: SCPI Click Utilities > Calibration. Clear the Cal Memory Protect box to allow calibration. Click Start to start the calibration procedure. Follow the on-screen instructions as calibration proceeds. Keysight Infiniium 90000A Series Service Guide...
  • Page 108: Removing And Replacing The Hard Disk And Hard Disk Control Board

    Disconnect the power cable and remove the cover and top plate. Disconnect the two cables connected to the hard disk. Remove the two latch screws located on the rear panel of the oscilloscope. Pull the hard disk out. Keysight Infiniium 90000A Series Service Guide...
  • Page 109 To remove the hard disk control board, first locate it by looking in the cavity where the hard disk used to be. Remove the two Torx T10 screws holding the board to the frame. To replace the hard disk and hard disk control board, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 110: Removing Cables (For Replacing The Motherboard)

    SATA cable between motherboard and hard disk Power cable for CPU fan Front panel USB cable SATA cables between backplane and motherboard Power harness between Display cable between backplane and motherboard motherboard and front panel Keysight Infiniium 90000A Series Service Guide...
  • Page 111 S A T A ca ble betwe en m otherboard a nd ha rd drive F ront pa ne l U S B ca ble S A T A ca bles between ba ckplane a nd m otherboard Keysight Infiniium 90000A Series Service Guide...
  • Page 112 Replacing Assemblies D ispla y ca ble between m otherboard a nd front pa nel P ower harness between ba ckplane a nd m otherboard P ower cab le for C P U fa n Keysight Infiniium 90000A Series Service Guide...
  • Page 113 Replacing Assemblies P ower harness between backplane and m otherboard O n/ O ff ca ble Keysight Infiniium 90000A Series Service Guide...
  • Page 114 Replacing Assemblies Motherboard and cables in performance-enhanced 90000A Series models Keysight Infiniium 90000A Series Service Guide...
  • Page 115: Removing And Replacing The Power Supply

    The picture below shows where the AC power cable connects to the bulk 12V power supply. AC p ower ca ble into bulk 1 2V powe r supply Follow the instructions on the label attached to the top of the power supply to remove it. Keysight Infiniium 90000A Series Service Guide...
  • Page 116: Removing And Replacing The Fans

    Check the flow arrows on the fan and check for proper flow once power is applied to the oscilloscope. Improper air flow can overheat the oscilloscope. To install a fan, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 117: Removing And Replacing The Power Cord

    Unscrew the power cord connector from the rear panel (Torx T10 screws). Remove the ground screw (Torx T10) on right side of hard drive. Pull the power cord out of the instrument. To replace the power cord, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 118: Removing And Replacing The Usb Or Gpib Port

    Remove the screw from top edge of the chassis. Undo the connection to the motherboard by disconnecting the cable. Pull the port out of the instrument. To replace one of these ports, reverse this procedure. Keysight Infiniium 90000A Series Service Guide...
  • Page 119 Replacing Assemblies Keysight Infiniium 90000A Series Service Guide...
  • Page 120 Ordering Replaceable Parts / 120 Exploded Views / 121 Replaceable Parts List / 125 This chapter describes how to order replaceable assemblies and parts for the Infiniium 90000A Series oscilloscopes. Service support for this oscilloscope is replacement of parts to the assembly level.
  • Page 121 Replaceable Parts 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 To order a part not listed in the parts list, include the oscilloscope part number, oscilloscope serial number, a description of the part (including its function), and the number of parts required.
  • Page 122 Replaceable Parts Exploded Views Front Frame and Front Panel Keysight Infiniium 90000A Series Service Guide...
  • Page 123 Replaceable Parts Fan and Acquisition Assembly Keysight Infiniium 90000A Series Service Guide...
  • Page 124 Replaceable Parts Power Supply and PC Motherboard Keysight Infiniium 90000A Series Service Guide...
  • Page 125 Replaceable Parts Sleeve and Accessory Pouch Keysight Infiniium 90000A Series Service Guide...
  • Page 126 Acquisition Printed Circuit Assembly 6 GHz and below - replaces 54906-66501 54906-69511 Acquisition Printed Circuit Assembly 6 GHz and below - Exchange, replaces 54906-69501 54913-00502 Acquisition Frame 54913-66410 RHDD Board Printed Circuit Assembly 54913-68711 Fan Replacement Kit 90 MM 82350-66512 GPIB Interface Card Keysight Infiniium 90000A Series Service Guide...
  • Page 127 It is a part of the chassis on standard models.) 54913-68701 Replacement HDD for M880/XP-based 90000 Series scopes 54913-83503 Infiniium 90000A Series imaged hard-drive, version M880-9XB (Service Centers only) 54913-83505 Infiniium series Imaged HDD for M890/WinXP (Service Centers only)
  • Page 128 Label - Rear Panel without RHDD MP20 54913-62301 Accessory Pouch MP21 54913-94307 RHDD Label MP22* 54913-04101* Cover (standard models; 1 handle) MP22** 54916-04101** Cover (performance-enhanced models; 2 handles) MP23 54913-41001 Rear Foot MP24 54913-44101 Front Cover Keysight Infiniium 90000A Series Service Guide...
  • Page 129 Power cord - Chile 8121-1632 Power cord - China 8120-5399 Power cord - South Africa 8121-1660 Power cord - Thailand 8121-1858 Power cord - Brazil 8121-1636 Power cord - Taiwan 8121-1640 Power cord - Cambodia Keysight Infiniium 90000A Series Service Guide...
  • Page 130 For information on how to tell which model you have, refer to page ** Parts marked with a double asterisk are to be used only with the performance-enhanced models (not standard models). For information on how to tell which model you have, refer to page Keysight Infiniium 90000A Series Service Guide...
  • Page 131 Replaceable Parts Keysight Infiniium 90000A Series Service Guide...
  • Page 132 Display Board / 137 On/Off Board / 137 Main FPGA / 137 Power Supply Assembly / 138 Monitor Assembly / 138Disk Drive / 138 This chapter describes the basic structure of the Infiniium 90000A Series oscilloscope and how the parts interact.
  • Page 133 Theory of Operation Oscilloscope block diagram Keysight Infiniium 90000A Series Service Guide...
  • Page 134: Theory Of Operation

    Theory of Operation Block-Level Theory The main components of the Infiniium 90000A Series oscilloscopes are described here. Motherboard The motherboard provides all system control and interface functions for the oscilloscope. It contains a CPU, ROM, and RAM; keyboard and mouse interfaces, serial and parallel interfaces, CDROM, hard disk drive interface, PCI buses, etc.
  • Page 135: Backplane Assembly

    FPGA and the acquisition FPGAs using an 8-bit parallel bus with miscellaneous control signals. There is a separate bus for each FPGA so timing problems and reflections could be minimized. After programming is complete, the Keysight Infiniium 90000A Series Service Guide...
  • Page 136: Front Panel

    The keyboard links to the scope PC motherboard through a high-speed USB 2.0 interface. The on-board USB hub serves the PIC microcontroller, the touch screen controller board, and up to three front panel USB connectors for customer peripherals. Keysight Infiniium 90000A Series Service Guide...
  • Page 137: Rear Panel

    • BNC connector for auxiliary output signal • AutoProbe interface for probe power and probe control • A connection for probe compensation Rear panel The rear panel provides several connections: • The line power input Keysight Infiniium 90000A Series Service Guide...
  • Page 138: Display Board

    PC system. All system controls and data must pass through the main FPGA. It contains a number of registers that can be used to control peripherals, configure, and communicate with other FPGAs, and pass sampled data to the PC. shows the Keysight Infiniium 90000A Series Service Guide...
  • Page 139: Power Supply Assembly

    The hard disk drive is a high-capacity, shock-resistant unit. It is used to store the oscilloscope’s operating system and certain system configuration data. The drive can also be used to store and recall oscilloscope setups and waveforms. Keysight Infiniium 90000A Series Service Guide...
  • Page 141 This information is subject to change without notice. © Keysight Technologies 2007, 2008, 2013, 2015, 2017 10th edition, February 2017 *54913-97030* 54913-97030 www.keysight.com...

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