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Keysight 8990B Service Manual

Peak power analyzer
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Keysight 8990B Peak Power
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  • Page 1 Keysight 8990B Peak Power Analyzer Service Guide...
  • Page 2 Declarations of Conformity for this understood and met. where in the EULA. Keysight shall be product and for other Keysight prod- under no obligation to update, revise or ucts may be downloaded from the otherwise modify the Software.

  • Page 3: Certification

    Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or any information contained herein.

  • Page 4: Limitation Of Warranty

    Buyer. Keysight does not warrant the Buyer’s circuitry or malfunctions of Keysight products that result from the Buyer’s circuitry. In addition, Keysight does not warrant any damage that occurs as a result of the Buyer’s circuit or any defects that result from Buyer-supplied products.

  • Page 5: Safety Considerations

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

  • Page 6: General Safety Information

    REMOVE POWER and do not use the instrument until safe operation can be verified by service-trained personnel. If necessary, return the instrument to Keysight for service and repair to ensure that the safety features are maintained. – Do not substitute parts or modify the instrument. Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument.

  • Page 7: Regulatory Markings

    Forty years is the expected useful life of the product. This symbol is a South Korean Class A EMC Declaration. This is a Class A instrument suitable for professional use and in electromagnetic environment outside of the home. Keysight 8990B Service Guide...

  • Page 8: Waste Electrical And Electronic Equipment (Weee) Directive

    To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information. Sales and Technical Support To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/peakpoweranalyzer (product-specific information and support, software and documentation updates) –...

  • Page 9: Table Of Contents

    ..........51 Theory of Operation Keysight 8990B Service Guide...
  • Page 10 Front panel display isolation ....... 69 Keysight 8990B Service Guide...
  • Page 11 ....... . .155 Returning Your Peak Power Analyzer for Service ....156 Packaging the power meter for shipment to Keysight for service .156 Keysight 8990B Service Guide...
  • Page 12 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...
  • Page 13 Cabinet sub-assembly ......80 Figure 4-7 8990B module and support plate sub-assembly ..81 Figure 4-8 Remove the T20 screws at the handle .
  • Page 14 ..131 Figure 4-48 Remove and replace the hard disk ....131 Keysight 8990B Service Guide...
  • Page 15 ......148 Figure 4-70 Uninstall all the connectors ....149 Keysight 8990B Service Guide...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...
  • Page 17 Cabinet sub-assembly ......80 Table 4-6 8990B module and support plate sub-assembly ..81 Table 4-7 Replacement parts .
  • Page 18 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...
  • Page 19 Keysight 8990B Peak Power Analyzer Service Guide Performance Verification and Adjustments Introduction Equipment List Performance Verification Adjustments The performance verification procedures described in this chapter verify that the 8990B is operating within its published specifications.

  • Page 20: Performance Verification And Adjustments

    The performance verification procedures described in this chapter verify the peak power analyzer’s electrical performance against the published specifications. For the 8990B characteristics and specifications details, refer to the 8990B User’s Guide. Performance verification is used for incoming inspection, the calibration cycle (also called periodic maintenance), or after repairs have been made.

  • Page 21: Equipment List

    – SWR: ≤1.20 at 1 GHz N-type to BNC – N-type (m) to BNC (f) 1250-1476 adapter – 50 Ω characteristic impedance N-type to SMA – N-type (f) to 3.5 mm (m) SMA 1250-1750 adapter – 50 Ω characteristic impedance Keysight 8990B Service Guide...
  • Page 22 – 50 Ω characteristic impedance U2032A – BNC (m) to SMB (f) BNC tee adapter – BNC Tee (m)(f)(f) 1250-0781 – 50 Ω characteristic impedance BNC to dual banana BNC (f) to dual banana (m) 1251-2277 adapters Keysight 8990B Service Guide...

  • Page 23: Performance Verification

    Zero set verification setup 3 Allow the system to warm up for approximately an hour. 4 Set the 8990B RF input channel 1 frequency to 1 GHz. 5 Connect the N1923/4A to the sensor check source of the 8990B. Keysight 8990B Service Guide...

  • Page 24: System Accuracy Verification

    RF input channel 4. System accuracy verification The purpose of this verification is to verify the accuracy of the 8990B after a period of usage to ensure that the Peak Power Analyzer is still within its published specifications.

  • Page 25: Procedure

    – PSG analog signal generator (E8257D) – Power sensor (N8481A/N8487A) – Power meter (N1914A/E4417A) – PEAK Power Analyzer and sensor [DUT] (8990B and N1923A/N1924A) – Power amplifier – Directional RF coupler – Low-pass filter (for reducing the high harmonic content of the test signal to...

  • Page 26: Figure 1-2 Equipment Setup For Low Power Verification

    7 Repeat steps 4 to 6 for other frequencies with the same power level. 8 Turn off the RF output of the signal generator. 9 Remove the standard sensor from the test port. 10 Replace it with the 8990B and N1923A/N1924A power sensor, which is the device-under-test (DUT). Keysight 8990B Service Guide...
  • Page 27 If the verification fails, return the 8990B to Keysight. 17 Repeat steps 4 to 16 by sweeping through the power levels from -25 dBm to +10 dBm. Level the power manually if necessary, with reference to the incident...

  • Page 28: Figure 1-3 Equipment Setup For High Power Verification

    DUT. – The procedure below is only applicable for limited verification. For full verification, you need to return the 8990B to Keysight. 1 Connect the standard sensor (N8481A/N8487A) to the power meter's channel A and the incident sensor (N8481A/N8487A) to the power meter's channel B.
  • Page 29 9 Turn off the RF output of the signal generator. 10 Remove the standard sensor from the test port. 11 Replace it with the 8990B and N1923A/N1924A power sensor, which is the device-under-test (DUT). 12 Zero and calibrate the DUT.
  • Page 30 If the verification fails, return the 8990B to Keysight. 18 Repeat steps 13 to 17 by sweeping through the power levels from +10 dBm to +20 dBm. Level the power manually if necessary, with reference to the incident...

  • Page 31: Rise And Fall Time Verification

    – 1 unit of N1923/4A wideband power sensor (DUT) System specifications: – Rise/fall time: ≤5.5 ns ±% error (Refer to Figure 1-4) – Overshoot: 0.5% Figure 1-4 Measured rise time percentage error versus signal-under-test rise time Keysight 8990B Service Guide...

  • Page 32: Figure 1-5 Screenshot Of The Measurement Reading From The

    This is to verify that the rise/fall time of the RF pulse measured by the oscilloscope is <5 ns and the overshoot is <0.5%. Figure 1-5 Screenshot of the measurement reading from the oscilloscope 4 Connect the N1923/4A to the E8257D and 8990B as shown in Figure 1-6. Keysight 8990B Service Guide...

  • Page 33: Figure 1-6 Rise And Fall Time Verification Setup

    Rise and fall time verification setup 5 Generate the same pulse signal as shown in step 6 Press Auto Scale on the 8990B to scale the pulse signal to the optimum display. 7 Turn off the video bandwidth on the 8990B.

  • Page 34: Timebase Frequency Accuracy Verification

    Test procedure 1 Turn on the 8990B and 53132A. 2 Allow the system to warm up for approximately an hour. 3 Connect the 8990B to the PC via USB interface. 4 The test equipment setup is as shown in Figure 1-7.

  • Page 35: Impedance Verification

    50 Ω and 1 MΩ inputs. Required test equipment: – 1 unit of 34410A digital multimeter – 2 units of 10503A BNC cable – 1 unit of BNC tee adapter (1250-0781) – 2 units of BNC to dual banana adapter (1251-2277) Keysight 8990B Service Guide...
  • Page 36 – 50 Ω ±2.5% – 1 MΩ ±1% Test procedure 1 Turn on the 8990B and 34410A. 2 Allow the system to warm up for approximately an hour. 3 Set up the digital multimeter to make a four-wire resistance measurement.

  • Page 37: Figure 1-8 Impedance Verification Setup

    Figure 1-8 Impedance verification setup 7 Press Default Setup on the 8990B to set the 8990B to its default settings. 8 Set the vertical scale for the video input channel 2 to 10 mV/div. 9 Set the input impedance for the video input channel 2 to 50 Ω. and verify the resistance reading with 50 Ω...

  • Page 38: Offset Accuracy Verification

    – 1 unit 34410A/3458A digital multimeter – 2 units of 10503A BNC cable – 1 unit of 6614C DC power supply – 1 unit of BNC tee adapter (1250-0781) – 2 units of BNC to dual banana adapter (1251-2277) Keysight 8990B Service Guide...
  • Page 39 1 Turn on the 8990B and multimeter. 2 Allow the system to warm up for approximately an hour. 3 Press Default Setup on the 8990B to set the 8990B to its default settings, and turn on video input channel 2.

  • Page 40: Figure 1-9 Offset Accuracy Verification Setup

    Offset accuracy verification setup 2 Set the digital multimeter to measure DC voltage. 3 Press Default Setup on the 8990B to set the 8990B to its default settings, and turn on video input channel 2. 4 Enable averaging and set the average count to 256.

  • Page 41: Table 1-4 Test Record For Offset Accuracy Verification

    1.8 mV 0.02 ±10 V 2.6 mV 0.05 ±10 V 5.0 mV ±20 V 9.0 mV ±20 V 17.0 mV ±20 V 41.0 mV ±100 V 81.0 mV ±100 V 161.0 mV ±100 V 401.0 mV Keysight 8990B Service Guide...
  • Page 42 1.8 mV 0.02 ±10 V 2.6 mV 0.05 ±10 V 5.0 mV ±20 V 9.0 mV ±20 V 17.0 mV ±20 V 41.0 mV ±100 V 81.0 mV ±100 V 161.0 mV ±100 V 401.0 mV Keysight 8990B Service Guide...

  • Page 43: Dc Gain Verification

    DC voltages. The gain accuracy measurement is made by measuring the difference between two DC voltages and comparing the difference to the same voltages measured by a digital multimeter. The comparison between the two voltages is performed regardless of the 8990B offset error and ground reference. Required test equipment: –...

  • Page 44: Figure 1-10 Dc Gain Verification Setup

    DC gain verification setup 2 Allow the system to warm up for approximately an hour. 3 Press Default Setup on the 8990B to set the 8990B to its default settings, and turn on video input channel 2. 4 Enable averaging and set the average count to 256.
  • Page 45 ±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 ±3.0 V ±2% 2 V/div ±6.0 V ±2% 5 V/div ±15.0 V ±2% Keysight 8990B Service Guide...

  • Page 46: Maximum Frequency Verification (Analog Bandwidth)

    AC gain is 3 dB or less. Required test equipment: – 1 unit of E8257D Option 520 signal generator – 1 unit of 11667A power splitter Keysight 8990B Service Guide...

  • Page 47: Figure 1-11 Maximum Frequency Verification Setup

    4 Perform zeroing and calibration for the power sensor. 5 Set the power meter to display the measurement in Watts. 6 Press Default Setup on the 8990B to set the 8990B to its default settings, and turn on video input channel 2.

  • Page 48: Table 1-6 Signal Generator Settings

    The power splitter has a 6 dB loss. NOTE 11 Turn on the RF Out of the signal generator. 12 Measure the input power at video input channel 2 of the 8990B, and convert the value to rms voltage using the following equation: ×...
  • Page 49 17 Set the horizontal scale to 2 ns/div. 18 Set the channel frequency of the power meter to 1 GHz. 19 Measure the input power at video input channel 2 of the 8990B, and convert the value to rms voltage using the following equation: ×...

  • Page 50: Table 1-7 Test Record For Maximum Frequency Verification

    5 mV/div 10 mV/div 20 mV/div 50 mV/div 100 mV/div 200 mV/div 500 mV/div 1 V/div Video input channel 3 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 8990B Service Guide...

  • Page 51: Adjustments

    8990B. Contact your local Keysight service center to perform adjustment on the 8990B. For more information, you can contact your local Keysight representative at the telephone numbers listed in “Contacting Keysight” on page 151 or at the Web address below.
  • Page 52 Performance Verification and Adjustments THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...

  • Page 53: Theory Of Operation

    Keysight 8990B Peak Power Analyzer Service Guide Theory of Operation Overview Processor PCI Mezzanine Card (PPMC) Assembly Backplane Main Board Assembly DAP Assembly Check Source Assembly Filter and Clock Distribution Board Test Acquisition Board PC Motherboard Power Supply Assembly Monitor Assembly...

  • Page 54: Overview

    RF pulse rise/fall time measurement of up to 5 ns. The 8990B has a high sampling rate of 100 MSa/s for RF channels. This enables the peak power analyzer to offer faster measurement speed and greater measurement accuracy in key applications such as radar pulse analysis and wireless pulse measurement.

  • Page 55: Processor Pci Mezzanine Card (Ppmc) Assembly

    – Stores the serial number of the peak power analyzer Inputs – Power supplies (from PSU, via main board) – Control and data lines (from main board and DAP) Outputs – Control, address, and data lines (to main board and DAP) Keysight 8990B Service Guide...

  • Page 56: Backplane Main Board Assembly

    – Provides the external trigger input or output – Provides the signal routing between the PPMC and DAP Inputs – Power supplies (from PSU) – Control, address, and data lines (from PPMC) Outputs – Control and data lines (to PPMC) Keysight 8990B Service Guide...

  • Page 57: Dap Assembly

    – Control, address, and data lines (from PPMC) Outputs – Processed peak path measurement data (to PPMC, via main board) – Control and data lines (to PPMC, via main board) – Trigger output (to external equipment) Keysight 8990B Service Guide...

  • Page 58: Check Source Assembly

    The filter and clock distribution board provides a 10 MHz clock conditioning source to sync the main board assembly with the test acquisition board. It performs filtering function when the 8990B is used with a sensor at a low frequency RF signal.

  • Page 59: Pc Motherboard

    PC Motherboard The PC motherboard provides all the system control and interface functions for the 8990B Windows® 7 based operating system. It contains the CPU, ROM, RAM, keyboard and mouse interfaces, serial and parallel interfaces, hard disk drive interface, and PCIE buses.

  • Page 60: Front Panel

    The hard disk drive is a high-capacity and shock-resistant unit. It is used to store the peak power analyzer operating system and certain system configuration data. The hard disk drive can also be used to store and recall the peak power analyzer setups and waveforms. Keysight 8990B Service Guide...

  • Page 61: Display Board

    ADC to give additional cooling, one small fan positioned over the trigger IC, and another small fan installed on the backplane main board to give additional cooling. The fans are all controlled by the main FPGA. Keysight 8990B Service Guide...
  • Page 62 Theory of Operation THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...
  • Page 63 Keysight 8990B Peak Power Analyzer Service Guide Troubleshooting Guide Introduction Power-Up Failure Instrument Self-Test Performance Verification Display Trouble Isolation Communication Interface Failure Check Source Failure Setup the BIOS Display the Software and Firmware Revision This chapter provides the troubleshooting information for the peak power...

  • Page 64: Troubleshooting Guide

    Troubleshooting Guide Introduction This chapter contains a general troubleshooting guide to detect failures for the 8990B peak power analyzer. The service strategy for this peak power analyzer is by replacement of the defective assembly boards. Power-Up Failure Table 3-1 Power-up failure troubleshooting...

  • Page 65: Instrument Self-Test

    – Main board (low probability) Channel 4 measurement path Ensures that the measurement Replace the DAP board – DAP assembly (high test path of channel 4 is working probability) – Main board or channel 4 sensor adapter board (low probability) Keysight 8990B Service Guide...

  • Page 66: Performance Verification

    Impedance failure – Scope acquisition board Offset accuracy failure – Scope acquisition board DC gain failure – Scope acquisition board Analog bandwidth check failure – Scope acquisition board Time scale accuracy failure – Scope acquisition board Keysight 8990B Service Guide...

  • Page 67: Display Trouble Isolation

    0 V. The outputs are controlled by the input. The input pin 5 goes low to enable the output voltage. These pins can be reached at J1 on the display board MP12. Keysight 8990B Service Guide...

  • Page 68: Table 3-4 Backlight Inverter Board Input Voltages

    Troubleshooting Guide Table 3-4 Backlight inverter board input voltages Backlight inverter board input vol tages Input pin Backlight OFF Backlight ON 2.5 V 12 V 12 V Keysight 8990B Service Guide...

  • Page 69: Front Panel Display Isolation

    Troubleshooting Guide Front panel display isolation Front panel display trouble isolation Connect the external monitor to the VGA port. Turn on the 8990B. Display on the external monitor? Replace the PC motherboard Check the display cable Front panel display connection to the touchscreen...

  • Page 70: Communication Interface Failure

    Ensure that the connector is not damaged PPMC assembly Check Source Failure The possible faults if the sensor check source of the peak power analyzer is not functioning are as follows. – Check source board (high probability) – Main board (low probability) Keysight 8990B Service Guide...

  • Page 71: Setup The Bios

    “Press TAB to show POST screen, DEL to enter SETUP, F12 to select boot drive.” If you do not see the message on the screen or the 8990B does not appear to be NOTE functioning, check the ribbon cable connectors to the motherboard.

  • Page 72: Display The Software And Firmware Revision

    Display the Software and Firmware Revision Use the following procedure to display the current software and firmware revision in the 8990B. 1 Select Support > About on the toolbar. 2 The About dialog is displayed with the current software revision information. Keysight 8990B Service Guide...

  • Page 73: Repair Guide

    Check Source Board Module Disassembly Remove and Replace the Power Supply and PC Motherboard Remove and Replace the Acquisition Board Assembly This chapter contains information on repair and replaceable parts of the 8990B. This chapter also explains how to disassemble the 8990B.

  • Page 74: Introduction

    Introduction This chapter contains the information for some of the higher level components and assemblies which can be ordered from Keysight. It also describes how to assemble and disassemble the peak power analyzer for repair. To order the replaceable parts, contact your local Keysight Sales and Service Office.

  • Page 75: Main Replacement Parts For 8990B

    Repair Guide Main Replacement Parts for 8990B Cabinet assembly 8990B module and support plate sub-assembly Processor power supply sub-assembly Rear mounting plate sub-assembly Air duct sub-assembly Front panel sub-assembly Figure 4-1 Overview assembly of the 8990B Keysight 8990B Service Guide...

  • Page 76: Front Panel Assembly

    PCA – Front panel without USB 08990-40200 Bezel (Option U01) 08990-40201 Bezel without USB host (Option U02) 54913-47402 18 mm knob Flint gray 54913-47401 12 mm knob Flint gray 54904-66405 PCA front panel 54904-68708 Display/touchscreen – support assembly Keysight 8990B Service Guide...

  • Page 77: Air Duct Sub-Assembly

    Repair Guide Air duct sub-assembly Figure 4-3 Air duct sub-assembly Table 4-2 Air duct sub-assembly Part number Quantity Description 54904-68502 80 mm fan assembly 54904-68503 60 mm fan assembly 54904-44102 Air duct Keysight 8990B Service Guide...

  • Page 78: Pc Motherboard Sub-Assembly

    Description 0960-2939 Motherboard Flex-ATX Core 2 Duo 4 GB with inverted backlight-enable 08990-60205 8990B power supply deck assembly 0950-5060 Power supply module 700-Watt 12 V with one output 3160-4331 CPU fan assembly with socket 12 VDC 5000 RPM Keysight 8990B Service Guide...

  • Page 79: Rear Mounting Plate Sub-Assembly

    Rear mounting plate sub-assembly Figure 4-5 Rear mounting plate sub-assembly Table 4-4 Rear mounting plate sub-assembly Part number Quantity Description 08990-68707 8990B hard drive replacement kit 54904-00107 Standard hard disk plate 08990-00105 8990B rear mounting deck 54904-68501 Fan assembly Keysight 8990B Service Guide...

  • Page 80: Cabinet Sub-Assembly

    Repair Guide Cabinet sub-assembly Figure 4-6 Cabinet sub-assembly Table 4-5 Cabinet sub-assembly Part number Quantity Description 54904-44901 Handle 54904-44902 Handle keeper 08990-44402 Bucket Keysight 8990B Service Guide...

  • Page 81: 8990B Module And Support Plate Sub-Assembly

    Part number Quantity Description 08990-66004 Tested checking source board for SPO 08990-00601 Shield can bottom 08990-66005 Tested PPMC with 8990B firmware for SPO 08990-68501 Sanyo Denki fan 08990-66002 Tested backplane motherboard for SPO 08990-00600 Shield can top 08990-66003 Tested filter and clock distribution board for SPO...

  • Page 82: Replacement Parts

    Repair Guide Replacement Parts Table 4-7 Replacement parts Part number Description Item 08990-00109 8990B N-type CON cover 08990-84300 Label ID - 8990B 08990-94301 Label - Control panel 08990-94303 Label - PC IO (option U01) 08990-94302 Label - PC IO without USB host (Option U02)
  • Page 83 Repair Guide Table 4-7 Replacement parts Part number Description Item 08990-84302 Label - Probe comp 08990-84303 Label - Check source 08990-84304 Label - Port 1 08990-84305 Label - Port 2 08990-84306 Label - Port 3 Keysight 8990B Service Guide...
  • Page 84 Repair Guide Table 4-7 Replacement parts Part number Description Item 08990-84307 Label - Port 4 54913-94300 Label - Colored knob set 08990-41900 Switch - Control Panel 08990-61615 PSU to AC inlet 08990-44700 Filler plate Keysight 8990B Service Guide...
  • Page 85 Table 4-7 Replacement parts Part number Description Item 08990-62300 Storage pouch 08990-00101 8990B acquisition deck 54574-09101 Spring - Tilt leg 1520-0702 Fan-mount break away 83.5 mm - LG 0.8-1.6 mm-THK silicone rubber 08990-25000 Stand off HEX male-female Keysight 8990B Service Guide...
  • Page 86 Repair Guide Table 4-7 Replacement parts Part number Description Item 08990-61606 N-type connector semi rigid cable 08990-61603 Sensor cable ODU 08990-00108 8990B cable cover N1911-61003 Calibrator cable assembly 08990-61600 Cable from PSU to motherboard Keysight 8990B Service Guide...
  • Page 87 Repair Guide Table 4-7 Replacement parts Part number Description Item 08990-61608 MMCX male right-angle cable 08990-61613 Cable 2-pin 08990-61616 MMCX male straight/right-angle cable 5190-3462 RF cable assembly, SMB/F-SMB/F, length is 80, without marker 08990-61601 Power ATX cable Keysight 8990B Service Guide...
  • Page 88 Replacement parts Part number Description Item 08990-61614 Cable standby/ON-OFF 08990-61625 Cable display/inverter USB 08990-44101 Cover - Front 08990-61604 USB cable (mini USB to 10 pin receptacles) 08990-61607 BNC cable (10 MHz Out scope to filter board) Keysight 8990B Service Guide...
  • Page 89 Repair Guide Table 4-7 Replacement parts Part number Description Item 08990-61609 BNC cable (from filter board to 8990B 10 MHz Out) 08990-61611 BNC cable (Trig In PM to DAP board) 08990-61618 BNC cable (Trig In scope to filter board) 08990-61619...
  • Page 90 Repair Guide Table 4-7 Replacement parts Part number Description Item 54901-66501 Test acquisition board 1 GHz 54904-43901 Shaft - Power switch 54904-43201 Thermal pad 54904-01202 Heat spreader 54904-01203 Heat spreader - Bottom Keysight 8990B Service Guide...
  • Page 91 Repair Guide Table 4-7 Replacement parts Part number Description Item 54904-01201 Bracket - Removable hard disk 54904-04101 Plate - Removable hard disk 54904-41202 Clamp SATA 54904-94317 Label - Removable hard disk tray 54904-00108 Bracket - Power supply Keysight 8990B Service Guide...
  • Page 92 Repair Guide Table 4-7 Replacement parts Part number Description Item 7144-0709 Rear panel I/O shield 54904-44001 Rubber foot set 54904-41001 Tilt leg 54904-42202 Keybox 54904-61606 Cable - USB device Keysight 8990B Service Guide...
  • Page 93 Repair Guide Table 4-7 Replacement parts Part number Description Item 54904-61612 Cable - Bulk power 54904-61609 Cable - Front panel power 54904-61614 Cable - Hard disk power 1400-3411 Saddle-wire side entry 0.22-IN 0960-2796 Touchscreen controller board 5V-DC Keysight 8990B Service Guide...
  • Page 94 Inverter DC to AC 4-Watt 2-output 1420-0394 Battery 3 V 1 A-HR Lithium Manganese Dioxide The replacement parts are not trade parts and can only be ordered through the NOTE Keysight Service Center for repair purposes. Keysight 8990B Service Guide...

  • Page 95: Tools Required

    Philips 5 in-lbs power driver Fit the screws on the CPU fan Customized socket for power reference Fit the nut at the front panel N-type connector connector Special tooling kit (N1912-61807) Fit the sensor connector Keysight 8990B Service Guide...
  • Page 96 Fit the screw to the front panel PCA (beside the channel 2 and channel 3) T8, 5 in-lbs power driver Attach the filter board on top of the DAP assembly or attach the PPMC/DAP assembly to the main board Keysight 8990B Service Guide...

  • Page 97: Remove And Replace The Handle And Rear Cover

    Use this procedure to remove and replace the 8990B handle and rear cover. 1 Disconnect the power cable. 2 Disconnect any connected cables to the 8990B. 3 Remove the two T20 screws at the handle on top of the 8990B as shown in Figure 4-8.

  • Page 98: Figure 4-9 Remove The T20 Screws From The Upper Rear Cover

    Repair Guide Figure 4-9 Remove the T20 screws from the upper rear cover 5 Remove the two T20 screws on the bottom rear cover of the 8990B as shown Figure 4-10. Figure 4-10 Remove the T20 screws on the bottom rear cover...

  • Page 99: Figure 4-11 Lift Up The Rear Cover

    Repair Guide 6 Place the 8990B face down and lift up the rear cover to remove it from the chassis as shown in Figure 4-11. Figure 4-11 Lift up the rear cover – Properly tighten the handle and screws. CAUTION –...

  • Page 100: Front Panel Disassembly

    Figure 4-12 Remove the nuts at the sensor connector and the N-type connector 3 Remove the four screws on both of the cable shields at the bottom of 8990B with the 18 in-lbs, T20 Torx screwdriver as shown in Figure 4-13.

  • Page 101: Figure 4-13 Remove The 4 Units Of Screws On Both Of The Cable

    Repair Guide Figure 4-13 Remove the 4 units of screws on both of the cable shields 4 Position the 8990B upright and disengage the series of tabs around the outside of the front bezel as in Figure 4-14. Figure 4-14...

  • Page 102: Figure 4-15 Pull The Front Panel Bezel Off

    6 Detach the N-type connector cover (08990-00109) from the front panel PCA by unslotting it from the holes on the acquisition deck and release the two screws (0515-1246) with the 5 in-lbs, T10 Torx screwdriver as shown in Figure 4-16. Keysight 8990B Service Guide...

  • Page 103: Figure 4-16 Unslot The N-Type Connector And Release The Two Screws

    (0515-1246) acquisition deck Figure 4-16 Unslot the N-type connector and release the two screws 7 Remove the N-type connector cover (08990-00109) from the front panel. Figure 4-17 N-type connector cover Keysight 8990B Service Guide...

  • Page 104: Figure 4-18 Pull Up All The Knobs

    Pull up all the knobs 9 Remove the screw near the front panel USB ports with the T10, 5 in-lbs torx screwdriver as shown in Figure 4-19. Figure 4-19 Remove the screw near the front panel USB ports Keysight 8990B Service Guide...

  • Page 105: Figure 4-20 Disengage The Three Tabs

    11 for the bottom tab. Look along the inner edge from the bottom, push in on the bottom tab (push towards the top of the 8990B), and then pull up on the plastic keyboard cover. Keysight 8990B Service Guide...

  • Page 106: Figure 4-21 Plastic Keyboard Cover

    (towards the bottom of the oscilloscope) and pull up as shown to disengage this tab Top of the 8990B Figure 4-21 Plastic keyboard cover 13 Once the two inner tabs and three outer tabs have been disengaged, pull the...

  • Page 107: Figure 4-23 Disconnect The Cable Connected To The Front Panel

    15 Remove the front panel keyboard from the plastic keyboard cover. There are a series of six tabs around the outside edge, holding the plastic covering the keyboard. Disengage all of these and then separate the two pieces as shown in Figure 4-24. Keysight 8990B Service Guide...

  • Page 108: Figure 4-24 Remove The Front Panel Keyboard From The Plastic Keyboard Cover

    16 If you are replacing the front panel keyboard, ensure that the front panel keyboard and the breakaway board are attached together. You have to break them apart and then use the two pieces. The break occurs beneath the USB ports on the front panel keyboard. Keysight 8990B Service Guide...

  • Page 109: Figure 4-25 Remove The Breakaway Board

    These are two of the latches you are disengaging when Touchscreen you pull the board straight away from the touchscreen Figure 4-25 Remove the breakaway board 18 Disconnect the cable from the back of the breakaway board as shown in Figure 4-26. Keysight 8990B Service Guide...

  • Page 110: Figure 4-26 Disconnect The Cable From The Back Of The Breakaway Board

    Figure 4-27. other Remove these latch two screws Once the screws are removed, disengage this latch and the on the other side to lift up and remove the board Figure 4-27 Remove the Autoprobe board Keysight 8990B Service Guide...

  • Page 111: Figure 4-28 Remove The Two T15 Screws

    Repair Guide 20 When reattaching the Autoprobe board, do not fully tighten the two T10 screws until you have reattached the front panel keyboard to the 8990B and attached it to the Autoprobe board. Once the front panel keyboard is attached, tighten the Autoprobe screws with the 5 in-lbs, T10 torx screwdriver.

  • Page 112: Figure 4-29 Remove The Screws And The Cables

    Disconnect this cable (the one with the blue connector) because it is connected to the touchscreen Disconnect this display cable These are the three cables that need to be disconnected before you remove the touchscreen display Figure 4-29 Remove the screws and the cables Keysight 8990B Service Guide...

  • Page 113: Figure 4-30 Remove The Four T10 Screws

    24 To replace the backlight inverter board, disconnect the cables from the backlight inverter board and remove the two T10 screws as shown in Figure 4-31. You may need to temporarily remove the touch screen cable (blue connector) in order to remove and replace the inverter board. Keysight 8990B Service Guide...

  • Page 114: Figure 4-31 Replace The Backlight Inverter Board

    25 When replacing the inverter board, use the 5 in-lbs, T10 torx screwdriver to tighten the screws. 26 To replace the touchscreen controller board (0960-2796), disconnect the cables from the touchscreen controller board and remove the two T10 screws as shown in Figure 4-32. Keysight 8990B Service Guide...

  • Page 115: Figure 4-32 Replace The Touchscreen Controller Board

    Remove these two T10 screws Figure 4-32 Replace the touchscreen controller board – When performing this procedure in reverse to reassemble the 8990B, ensure NOTE that all the edges (inner and outer edges) are fully pressed in when you place the front bezel back on the 8990B.

  • Page 116: Disassembly

    Repair Guide Disassembly Use this procedure to disassemble the 8990B. 1 Place the 8990B face down and remove the top cover with the following steps. a Unscrew the 4 screws (0515-0390) on the cover with the 18 in-lbs, T20 Torx screwdriver.

  • Page 117: Figure 4-34 Cable Connections At The Bnc Connector Base

    BNC cable (Trig Out scope to filter board) P131 08990-61618 BNC cable (Trig In scope to filter board) 08990-61609 BNC cable (filter board to 8990B 10 MHz Out) 08990-61611 BNC cable (Trig In PM to DAP board) 08990-61620 BNC cable (Trig Out PM to DAP board)

  • Page 118: Figure 4-35 Remove The Mmcx Cables

    3 Remove the 2 MMCX cables (08990-61616) as shown in Figure 4-35. Filter board DAP board J12 (10 Figure 4-35 Remove the MMCX cables 4 Remove the 2 pin cables (08990-61613) as shown in Figure 4-36. Keysight 8990B Service Guide...

  • Page 119: Figure 4-36 Remove The Pin Cables

    5 Disconnect the semi rigid cable from the attenuator with the 5 in-lbs, 5/16” open end wrench and remove the calibration cable assembly (N1911-61003) in between the check source board and backplane motherboard (08990-66002) as shown in Figure 4-37. Keysight 8990B Service Guide...

  • Page 120: Figure 4-37 Disconnect The Semi Rigid Cable And Remove The Calibration Cable Assembly

    Figure 4-37 Disconnect the semi rigid cable and remove the calibration cable assembly 6 Remove the sensor flex and coaxial cables (08990-61603) through the grommet and detach them from the filter board as shown in Figure 4-38. Keysight 8990B Service Guide...

  • Page 121: Figure 4-38 Remove The Sensor Flex And Coaxial Cables

    Table 4-10 Coaxial cables connections Description Channel 1 (Positive) J28 (P) Channel 1 (Negative) J29 (N) Channel 4 (Positive) P2 (P) Channel 4 (Negative) P3 (N) Table 4-10 can be used as a reference for reassembly. NOTE Keysight 8990B Service Guide...

  • Page 122: Figure 4-39 Remove The Smb Cables

    P109 (+) P4 (P) 5190-3462 SMB cables P108 (–) P5 (N) 5190-3462 SMB cables P111 (+) J31 (N) 5190-3462 SMB cables P110 (–) J30 (P) Table 4-11 can be used as a reference for reassembly. NOTE Keysight 8990B Service Guide...
  • Page 123 8 Remove the cables from the grommet of the sheet metal, and remove the BNC connectors as shown in Figure 4-40. Remove the cables from the grommet Remove the BNC connectors Figure 4-40 Remove the cables from the grommet of the sheet metal Keysight 8990B Service Guide...
  • Page 124 Disassembly” on page 132. 10 Unscrew the five screws (0515-1940) on the filter board (08990-66003) with the 5 in-lbs, T8 Torx screwdriver to remove it from the top of DAP board as shown in Figure 4-41. Keysight 8990B Service Guide...

  • Page 125: Figure 4-41 Unscrew The Screws On The Filter Board

    Filter board Figure 4-41 Unscrew the screws on the filter board 11 To remove and replace the sensor adapter board, unscrew the four screws (0515-0372) with the 5 in-lbs, T10 Torx screwdriver as shown in Figure 4-42. Keysight 8990B Service Guide...

  • Page 126: Figure 4-42 Remove The Sensor Adapter Board

    Repair Guide Sensor adapter board 0515-0372 (4 screws) Figure 4-42 Remove the sensor adapter board 12 The locations of the PCA boards in the 8990B are shown in Figure 4-43. Keysight 8990B Service Guide...

  • Page 127: Figure 4-43 Pca Boards Location

    (08990-60067) (08990-60068) PPMC (08990-66005) DAP board (08990-66001) Main board (08990-66002) Figure 4-43 PCA boards location 13 Disconnect all the cables as shown in Figure 4-44 before removing and replacing the PCA boards. Keysight 8990B Service Guide...

  • Page 128: Figure 4-44 Disconnect All The Cables

    Fan cable Figure 4-44 Disconnect all the cables 14 To remove and replace the DAP board and PPMC, detach the eight standoffs (08990-25000) with the 5 mm socket, 5 in-lbs as shown in Figure 4-45. Keysight 8990B Service Guide...

  • Page 129: Figure 4-45 Detach The 8 Screws

    15 To remove and replace the mainboard (08990-60064) from the deck, detach the five screws (0515-2143) with the 18 in-lbs, T20 Torx screwdriver and the screw (0515-0372) with the 5 in-lbs, T10 Torx screwdriver as shown in Figure 4-46. Keysight 8990B Service Guide...

  • Page 130: Figure 4-46 Remove The Mainboard

    16 To remove and replace the power supply module, PC motherboard, and scope acquisition board, you must uninstall the support deck by removing the screw (0515-2032) with 5 in-lbs, T10 Torx screwdriver and the four screws (0515-0390) with 18 in-lbs, T20 Torx screwdriver as shown in Figure 4-47. Keysight 8990B Service Guide...

  • Page 131: Figure 4-47 Remove And Replace The Power Supply Module, Pc Motherboard, And Scope Acquisition Board

    (0515-0430) with the 5in-lbs, T10 Torx screwdriver and then remove the hard disk SATA cable and power cable as shown in Figure 4-48. SATA cable 0515-0430 Power cable Figure 4-48 Remove and replace the hard disk Keysight 8990B Service Guide...

  • Page 132: Check Source Board Module Disassembly

    Detach the belt cover with the poron pad (08990-00110) as shown in Figure 4-50. Unscrew the four screws (0515-2007) with the 5 in-lbs, T8 Torx screwdriver and then remove the check source assembly (08990-66004) from the PPMC assembly. Keysight 8990B Service Guide...

  • Page 133: Figure 4-50 Detach The Belt Cover With The Poron Pad

    Detach the belt cover with the poron pad 3 Unscrew the five screws (0515-2007) on the shield can bottom (08990-00601) of the check source assembly with the 5 in-lbs, T8 Torx screwdriver as shown Figure 4-51. Keysight 8990B Service Guide...

  • Page 134: Figure 4-51 Shield Can Bottom Of The Check Source Assembly

    Shield can bottom of the check source assembly 4 Detach the shield can bottom and remove the check source board (08990-66004) for replacement. Figure 4-52 Check source board (08990-66004) 5 Take note on the connector orientation. Keysight 8990B Service Guide...

  • Page 135: Remove And Replace The Power Supply And Pc Motherboard

    Uninstall the L-bracket from the rear mounting deck b Remove the seven screws (0515-0390) with the 18 in-lbs, T20 Torx screwdriver and the screw (0515-2143) with the 18 in-lbs, T20 Torx screwdriver as shown in Figure 4-54. Keysight 8990B Service Guide...

  • Page 136: Figure 4-54 Remove The Seven Screws

    Repair Guide Figure 4-54 Remove the seven screws Keysight 8990B Service Guide...

  • Page 137: Figure 4-55 Remove The Three Screws

    4 Remove the rear mounting deck after the screws are removed. 5 Remove and replace the remote USB port (54904-61606) with the following steps. a Remove the jumper as shown in Figure 4-56. USB port jumper connector Figure 4-56 Remove the jumper Keysight 8990B Service Guide...

  • Page 138: Figure 4-57 Detach The Screws

    6 To remove and replace the CPU fan assembly (3160-4331), unscrew the screws with the Philips 5 in-lbs screwdriver and disconnect the jumper cable as shown in Figure 4-58. Jumper cable Figure 4-58 Remove the CPU fan assembly Keysight 8990B Service Guide...

  • Page 139: Figure 4-59 Remove The Pc Motherboard

    (0515-0374) with the 5 in-lbs T10, Torx screwdriver as shown in Figure 4-59. 0515-0374 (6 screws) 4-pin connector Fan power cable 20-pin power connector Red SATA cable Blue SATA cable LVDS cable USB cable Standby cable 08990-61604 Figure 4-59 Remove the PC motherboard Keysight 8990B Service Guide...

  • Page 140: Figure 4-60 Uninstall The Power Supply Deck Assembly

    4-61. Remove 0515-0390 with the 18 in-lbs T20 Torx screwdriver Remove Remove 0515-0372 0515-0390 with the 5 with the 18 in-lbs T10 in-lbs T20 Torx Torx screwdriver screwdriver Figure 4-60 Uninstall the power supply deck assembly Keysight 8990B Service Guide...

  • Page 141: Figure 4-61 Uninstall The Power Supply Deck Assembly

    10 Before uninstalling the power supply deck assembly, ensure that all the cables are removed through the grommet. 11 The power supply deck assembly with the power supply module and PC motherboard after they are removed from the 8990B are as shown in Figure 4-62.

  • Page 142: Figure 4-62 Power Supply Deck Assembly With The Power Supply Module And Pc Motherboard

    13 Remove and replace the power supply module with the following steps. a Unscrew the five screws (0515-0390) with the 18 in-lbs T20, Torx screwdriver and slot out the PSU as shown in Figure 4-63. Keysight 8990B Service Guide...

  • Page 143: Figure 4-63 Unscrew The Screws And Slot Out The Psu

    Unscrew the screws and slot out the PSU b Remove the three power cables connected to the power supply module from the PC motherboard as shown in Figure 4-64. Figure 4-64 Remove the power cables connected to the power supply module Keysight 8990B Service Guide...

  • Page 144: Figure 4-65 Loosen The Screws To Remove The Power Cables

    PSU as shown in Figure 4-65. Apply glue to the connectors to attach the connectors to the PSU permanently. NOTE 8-pin connector (Standby cable) Figure 4-65 Loosen the screws to remove the power cables Keysight 8990B Service Guide...

  • Page 145: Figure 4-66 Remove The Screws On The Bracket

    Repair Guide e Remove the two screws (0515-0390) on the bracket attached to the PSU with the 18 in-lbs T20 torx screwdriver as shown in Figure 4-66. Figure 4-66 Remove the screws on the bracket Keysight 8990B Service Guide...

  • Page 146: Remove And Replace The Acquisition Board Assembly

    Figure 4-67. b Uninstall the bottom slots from the tabs on the rear of the acquisition deck as shown in Figure 4-67. Uninstall from the tabs J128 J129 J127 Figure 4-67 Uninstall the connectors and cables Keysight 8990B Service Guide...

  • Page 147: Figure 4-68 Remove The Heat Spread

    2 To remove and replace the heat spread (54904-01202), remove the six screws (0515-1410) from the acquisition board standoff with the 5 in-lbs T10, Torx screwdriver as shown in Figure 4-68. Figure 4-68 Remove the heat spread Keysight 8990B Service Guide...

  • Page 148: Figure 4-69 New Thermal Pads

    4 To remove and replace the scope acquisition board (54901-66501), uninstall all the connectors (SATA connectors and front panel power cable connector) from the board and remove the six screws (0515-0372) with the 5 in-lbs T10, Torx screwdriver as shown in Figure 4-70. Keysight 8990B Service Guide...

  • Page 149: Figure 4-70 Uninstall All The Connectors

    Repair Guide Figure 4-70 Uninstall all the connectors Do not damage the heatsink. CAUTION Keysight 8990B Service Guide...
  • Page 150 Repair Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8990B Service Guide...
  • Page 151 Keysight 8990B Peak Power Analyzer Service Guide Contacting Keysight Introduction Before Calling Keysight Instrument Serial Numbers Returning Your Peak Power Analyzer for Service This chapter provides the steps to take if you experience a problem with your peak power analyzer.

  • Page 152: Contacting Keysight

    153. This section contains a checklist that helps you identify some of the common problems. If you wish to contact Keysight about any aspect of the peak power analyzer, from service problems to ordering information, refer to “Sales and Technical Support”...

  • Page 153: Before Calling Keysight

    Contacting Keysight Before Calling Keysight Before calling Keysight or returning the peak power analyzer for service, please make the checks listed in “Check the basics” on page 154. If your peak power analyzer is covered by a separate maintenance agreement, please be familiar with the terms.

  • Page 154: Check The Basics

    A few minutes spent in performing these simple checks may eliminate the time required for instrument repair. Before contacting Keysight or returning the peak power analyzer for service, please perform the following checks. – Check that the line socket has power.

  • Page 155: Instrument Serial Numbers

    The information is based on the serial number and option designation of each peak power analyzer. Whenever you contact Keysight about your peak power analyzer, have a complete serial number available. This ensures that you obtain the most complete and accurate service information.

  • Page 156: Returning Your Peak Power Analyzer For Service

    Use the information in this section if you need to return your peak power analyzer to Keysight. Packaging the power meter for shipment to Keysight for service – Fill in a blue service tag (available at the end of this manual) and attach it to the peak power analyzer.
  • Page 157 This information is subject to change without notice. Always refer to the English version at the Keysight website for the latest revision. © Keysight Technologies 2011–2019 Edition 9, November 4, 2019 Printed in Malaysia *08990-90010* 08990-90010 www.keysight.com...

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