Keysight Technologies N5224/5A Service Manual

2-port and 4-port pna - microwave network analyzers

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N5224/5A

2-Port and 4-Port

PNA - Microwave Network

Analyzers - Service Guide

N5224/5A Series -

(10 MHz - 43.5 GHz)

(10 MHz - 50 GHz)

This is the Service Guide for the N5224/5A Series Microwave Network Analyzers.

SERVICE GUIDE

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Table of Contents

Troubleshooting

Summary of Contents for Keysight Technologies N5224/5A

Page 1 N5224/5A 2-Port and 4-Port PNA - Microwave Network Analyzers - Service Guide N5224/5A Series - (10 MHz - 43.5 GHz) (10 MHz - 50 GHz) This is the Service Guide for the N5224/5A Series Microwave Network Analyzers. SERVICE GUIDE...
Page 2 DOCUMENT THAT CONFLICT WITH THESE TERMS, THE WARRANTY beyond those set forth in the TERMS IN THE SEPARATE EULA shall apply, except to the © Keysight Technologies, Inc. AGREEMENT WILL CONTROL. extent that those terms, rights, or 2011-2023 licenses are explicitly required...
Page 5: Table Of Contents
Contents 1. Safety and Regulatory Information Information in This Chapter ..........1-1 Chapter One at-a-Glance .
Page 6 Contents Performance Tests ............3-8 Certificate of Calibration .
Page 7 Contents Getting Started with Troubleshooting ......... . 4-4 Check the Basics .
Page 8 Contents Configurable Test Set ........... 5-18 A29–A32 Receiver Couplers .
Page 9 Contents External Hardware and Miscellaneous Parts, All Options ..... . 6-110 ..............6-111 7.
Page 10 Storing Correction Constants ..........8-18 A:.EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X...
Page 11: Safety And Regulatory Information
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Safety and Regulatory Information Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer. It also contains information that is required by various government regulatory agencies.
Page 12: Safety Symbols
Safety and Regulatory Information Safety Symbols Safety Symbols The following safety symbols are used throughout this manual. Familiarize yourself with each of the symbols and its meaning before operating this instrument. Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed or adhered to, could result in damage to or destruction of the instrument.
Page 13: General Safety Considerations
Safety and Regulatory Information General Safety Considerations General Safety Considerations Safety Earth Ground This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact.
Page 14 Safety and Regulatory Information General Safety Considerations Ventilation Requirements: When installing the product in a cabinet, the convection into and out of the product must not be restricted. The ambient temperature (outside the cabinet) must be less than the maximum operating temperature of the instrument by 4 °C for every 100 watts dissipated in the cabinet.
Page 15: Servicing
Safety and Regulatory Information General Safety Considerations Servicing These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so. Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended.
Page 16 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5224A/25A Service Guide...
Page 17: Electrostatic Discharge Protection
Safety and Regulatory Information Electrostatic Discharge Protection Electrostatic Discharge Protection Protection against electrostatic discharge (ESD) is essential while removing assemblies from or connecting cables to the network analyzer. Static electricity can build up on your body and can easily damage sensitive internal circuit elements when discharged.
Page 18 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5224A/25A Service Guide...
Page 19: Regulatory Information
Safety and Regulatory Information Regulatory Information Regulatory Information This section contains information that is required by various government regulatory agencies. Instrument Markings The table below lists the definitions of markings that may be on or with the product. Familiarize yourself with each marking and its meaning before operating the instrument.
Page 20 Safety and Regulatory Information Regulatory Information This symbol identifies the Protective Conductor terminal. This symbol indicates the equipment is protected throughout by double or reinforced insulation. The CE mark is a registered trademark of the European Community (if accompanied by a year, it is the year when the design was proven). It indicates that the product complies with all the relevant directives.
Page 21: Lithium Battery Disposal
If the battery on the A21 CPU board assembly needs to be disposed of, dispose of it in accordance with your country’s requirements. If required, you may return the battery to Keysight Technologies for disposal. Refer to “Contacting Keysight” on page 2-7 for assistance.
Page 22 Safety and Regulatory Information Regulatory Information 1-12 Keysight N5224A/25A Service Guide...
Page 23: General Product Information
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide General Product Information Information in This Chapter Chapter Two at-a-Glance Section Title Summary of Content Start Page Maintenance Cleaning instructions for the external surfaces of your page 2-2 analyzer. Information about electrical maintenance of your analyzer.
Page 24: Maintenance
General Product Information Maintenance Maintenance Physical Maintenance To prevent electrical shock, disconnect the analyzer from the mains source before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.
Page 25: Analyzer Options, Accessories, And Upgrades Available
General Product Information Analyzer Options, Accessories, and Upgrades Available Analyzer Options, Accessories, and Upgrades Available To see a list of the options, accessories, and upgrades available for the network analyzers, including ordering information, refer to the Keysight PNA Family Microwave Network Analyzers Configuration Guide, available online at https://www.keysight.com/us/en/assets/7018-02943/configuration-guides/ 5990-7745.pdf (5990-7745EN).
Page 26: Required Service Test Equipment
General Product Information Required Service Test Equipment Required Service Test Equipment Critical Specifications Recommended Alternate Model Equipment Model or Part or Part Number Number Test Instruments and Software Compression None specified U3070AK01 None test set Dynamic accuracy None specified U3020AD01 None test set N7840A...
Page 27 General Product Information Required Service Test Equipment Critical Specifications Recommended Alternate Model Equipment Model or Part or Part Number Number Calibration and Verification Kits 2.4 mm calibration kit 85056A 85056D DC to 50 GHz DC to 50 GHz 2.4 mm verification kit 85057B None 45 MHz to 50 GHz...
Page 28 General Product Information Required Service Test Equipment Critical Specifications Recommended Alternate Equipment Model or Part Model Number Number 1/4-inch and 5/16-inch Thin profile 8710-0510 open-end wrench 5/16-inch, open-end torque 1.1 and 2.4 N-m wrench (10 and 21 in-lb) settings (for semi-rigid cables) 1-inch, open-end torque 8.1 N-m (72 in-lb) setting (for...
Page 29: Keysight Support, Services, And Assistance
— R1282A Return to Keysight Calibration Plan The analyzer is delivered with a one-year calibration certificate. Options are available to have Keysight Technologies provide three or five year calibration coverage (perform the annual calibration two or four times). Options for basic calibration or ISO/IEC 17025 or ANSI/NCSL Z540.3–2006 standards compliant calibrations are available.
Page 30: Shipping Your Analyzer To Keysight For Service Or Repair
Keysight for repair. If you wish to send your network analyzer to Keysight Technologies for service or repair: —...
Page 31: Tests And Adjustments
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Tests and Adjustments Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your PNA. — The checks verify the operation of the assemblies in your analyzer. —...
Page 32 Tests and Adjustments Information in This Chapter Section Title Summary of Content Start Page About System Descriptions of: page 3-7 Verification and — System Specifications Performance Tests — Instrument Specifications — System Verification Procedure — Performance Tests — Certificate of Calibration ANSI/NCSL The ANSI/NCSL Z540.3–2006 and ISO/IEC 17025 process of verifying page 3-10...
Page 33 Tests and Adjustments Information in This Chapter Section Title Summary of Content Start Page Setups and procedures for adjusting your analyzer: page 3-41 Adjustments — 10 MHz Frequency Reference Adjustment — Synthesizer Bandwidth Adjustment — Source Adjustment — IF Gain Adjustment —...
Page 34: Before You Begin
Tests and Adjustments Before You Begin Before You Begin Before checking, verifying, or adjusting the analyzer, refer to the following paragraphs to: — make sure the operating environment is within its requirements — make sure that proper electrostatic discharge (ESD) protection is provided —...
Page 35: Allow The Analyzer To Warm Up
Prior to making connections to your analyzer, carefully review the information about inspecting, cleaning, and gaging connectors. Refer to the calibration kit documentation for detailed connector care information. For course numbers about additional connector care instruction, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-7. Table 3-1...
Page 36 Tests and Adjustments Before You Begin Table 3-1 Connector Care Quick Reference Guide — Gage all connectors before first use Making Connections — Align connectors carefully Do Not — Apply bending force to connection — Make preliminary connection contact — Over tighten preliminary connection lightly —...
Page 37: About System Verification And Performance Tests
Tests and Adjustments About System Verification and Performance Tests About System Verification and Performance Tests The performance of the network analyzer is specified in two ways: system specifications, and instrument specifications. It is the end user’s responsibility to determine which set of specifications is applicable to their use of the PNA. A network analyzer measurement “system”...
Page 38: Instrument Specifications
Tests and Adjustments About System Verification and Performance Tests Instrument Specifications The analyzer's instrument specifications are described in the Data Sheet and Technical Specifications documents, available online at: https://www.keysight.com/us/en/assets/9018-04042/technical-specificatio ns/9018-04042.pdf (N5224-90001) and https://www.keysight.com/us/en/assets/9018-04125/technical-specificatio ns/9018-04125.pdf (N5224-90002). These specifications apply when the analyzer is used to make either raw or error-corrected measurements.
Page 39: Certificate Of Calibration
About System Verification and Performance Tests Certificate of Calibration Keysight Technologies will issue a certificate of calibration upon successful completion of system verification or completion of the performance tests. The certificate of calibration will apply to the “system” (analyzer, calibration kit, test cables, and any necessary adapters) if the system verification procedure is used to confirm the system specifications.
Page 40: Ansi/Ncsl Z540.3-2006 And Iso/Iec 17025 Verification
Tests and Adjustments ANSI/NCSL Z540.3–2006 and ISO/IEC 17025 Verification ANSI/NCSL Z540.3–2006 and ISO/IEC 17025 Verification To meet the criteria for ANSI/NCSL Z540.3–2006 and ISO/IEC 17025, perform the preliminary checks and all performance tests without stopping to repair or adjust . Refer to Figure 3-1 for test flow.
Page 41: Non-Standards Compliant Verification
Tests and Adjustments Non-Standards Compliant Verification Non-Standards Compliant Verification To meet the criteria for non-standards compliant verification, perform the preliminary checks and the performance tests while stopping to troubleshoot. Refer to Figure 3-2 for test flow. Troubleshoot and repair the first problem encountered without continuing to other tests.
Page 42: Preliminary Checks
Tests and Adjustments Preliminary Checks Preliminary Checks Preliminary checks include the following: — “The Operator’s Check” on page 3-12 The operator’s check tests the network analyzer’s basic functionality of the source, switch, and receivers. — “The Test Port Cable Checks” on page 3-14 The test port cable checks are not required, but are recommended to verify the performance of the test port cables before performing the verification test.
Page 43 Tests and Adjustments Preliminary Checks 4. If shorts and opens are not connected to all ports, you will be prompted to connect them as they are needed. 5. The result of the operator’s check will be shown as a PASS or FAIL next to each test (refer to Figure 3-3).
Page 44: The Test Port Cable Checks
Tests and Adjustments Preliminary Checks If the Operator’s Check Fails 1. Clean the test ports, shorts, and adapters. Torque to specification. Repeat the check. 2. If the check still fails, suspect a faulty component. Refer to “Measurement System Troubleshooting” on page 4-26 to begin troubleshooting to determine the faulty component.
Page 45 Tests and Adjustments Preliminary Checks Figure 3-4 Typical Cable Return Loss Response If the Cable Return Loss Check Fails 1. Clean the cable and devices and torque to specification. Repeat the check. 2. If the check still fails, the cable should be repaired or replaced. Cable Insertion Loss Check The method below runs on the PNA environment using a mechanical Cal kit.
Page 46 Tests and Adjustments Preliminary Checks 7. Press UTILITY Macro , then . Select Calset 1 and Calset 2 Adapter Char as shown below in Figure 3-5. Figure 3-5 Adapter Characterize Dialog Box 8. Click the Characterize And Save button in the lower-left corner of the dialog box.
Page 47 Tests and Adjustments Preliminary Checks Figure 3-6 Typical Cable Insertion Loss Response If the Cable Insertion Loss Check Fails 1. Clean the cable and devices and torque to specification. Repeat the check. 2. If the check still fails, the cable should be repaired or replaced. Cable Magnitude and Phase Stability Check 1.
Page 48 Tests and Adjustments Preliminary Checks 6. To provide a good reference, hold the test cable in a straight line perpendicular to the front panel of the network analyzer. 7. Press RESPONSE , then Averaging Restart 8. Wait for the analyzer to average the measurement 50 times (approximately two seconds).
Page 49 Tests and Adjustments Preliminary Checks If the Cable Magnitude and Phase Stability Check Fails 1. Clean the cable and devices and torque to specification. Repeat the check. 2. If the check still fails, the cable should be repaired or replaced. Cable Connector Repeatability Check The connector repeatability measurement should be done at the test port as well as at the end of the test port cable.
Page 50 Tests and Adjustments Preliminary Checks 10.To re-normalize the data trace of the reconnected cable: press MARKER/ANALYSIS , then , then ENTRY Memory Data->Memory Enter 11.Repeat steps 7 through 9 at least three times to look for modes. Modes appear when a harmonic of the source fundamental frequency is able to propagate through the cable or connector.
Page 51: System Verification
Tests and Adjustments System Verification System Verification System verification is used to verify system-level, error-corrected uncertainty limits for network analyzer measurements. The verification procedure is automated and is contained in the firmware of the analyzer. The device data provided with the verification kit has a traceable path to a national standard.
Page 52: Measurement Traceability
Tests and Adjustments System Verification — directivity, — source match, — load match, — reflection and transmission frequency tracking, and — isolation (crosstalk). The random errors include: — noise, — drift, — connector repeatability, and — test cable stability. A complete description of system errors and how they affect measurements is provided in the analyzer’s on-line embedded help.
Page 53: Performing System Verification
Tests and Adjustments System Verification Figure 3-9 NIST Traceability Path for Calibration and Verification Standard Performing System Verification The following verification procedure is automated by the analyzer firmware. The process for the verification is: — connect cables to the analyzer test ports —...
Page 54 Tests and Adjustments System Verification choose to load an existing recent calibration that was created by the verification process. If necessary, refer to the analyzer’s on-line embedded help for information on storing and recalling calibrations. For each verification device, the analyzer reads a file from the verification disk and sequentially measures the magnitude and phase for all four S-parameters.
Page 55 Tests and Adjustments System Verification If the system verification is performed with a non-Keysight cable, ensure that the cable meets or exceeds the specifications for the test cable specified in the previous table, “Equipment Used in the System Verification Procedure.” Refer to the cable’s user’s guide for specifications.
Page 56 Tests and Adjustments System Verification — Print Tabular Data: Prints the verification data in tabular form which includes measured data and uncertainty limits. For an example, refer to Figure 3-12 on page 3-28. — Print Graphs: Prints the verification data in graphical form. The graphical form includes the measured data trace, factory supplied data trace, and uncertainty limits.
Page 57 Tests and Adjustments System Verification 4. If the analyzer still fails the test, check the measurement calibration by viewing the error terms as described in “Accessing Error Terms” on page 8-6. 5. Refer to Figure 3-11 for additional troubleshooting steps. Figure 3-11 System Verification Failure Flowchart Interpreting the Verification Results...
Page 58 Tests and Adjustments System Verification Each S-parameter measurement result is printed with frequency tested, lower and upper limit lines, the measured data, and the result of the test. Figure 3-12 Example of Printed Tabular Verification Results 3-28 Keysight N5224A/25A Service Guide...
Page 59 Tests and Adjustments System Verification Figure 3-13 shows an example of typical verification results with Print Graphs selected in the Printer Output area of the System Verification dialog box. The printed graphical results show the following: — the name of the device measured —...
Page 60 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5224A/25A Service Guide...
Page 61: Performance Tests
Tests and Adjustments Performance Tests Performance Tests The performance tests verify the electrical performance of your PNA. These performance tests are included in the analyzer’s firmware with Option 897 and Option 898. Your analyzer is automatically configured for each individual test. The model numbers of the equipment used by these performance tests are specified under “Required Service Test Equipment”...
Page 62: Source Maximum Power Output Test
Tests and Adjustments Performance Tests 6. The output power is measured, and the value is compared to the Preset setting. 7. This process is repeated at hundreds of frequencies across the analyzer’s full range. The difference between the measured power and the output setting must fall within the specified accuracy range at all points for the test to pass.
Page 63: Source Power Linearity Test
Tests and Adjustments Performance Tests Troubleshoot the source section of the analyzer and then repeat this test. Refer “Checking the Source Group” on page 4-32. Source Power Linearity Test Function of the Test: To verify that the power level is linear over the analyzer’s frequency range and to check the linearity of the automatic leveling control (ALC).
Page 64: Frequency Accuracy Test
Tests and Adjustments Performance Tests Frequency Accuracy Test Function of the Test: To verify the frequency accuracy and range of the analyzer’s source output. Specification Tested: Test Port Output–CW Accuracy Equipment Used: — Frequency counter — Test cable — Adapters Description of the Test: This test is performed over the full frequency range of the source synthesizer board, not the full frequency range of the analyzer.
Page 65: Receiver Compression Test
Tests and Adjustments Performance Tests Description of the Test: Trace Noise is a calculation of the standard deviation of a 201 point CW measurement. In a healthy analyzer, this measurement is only affected by the sampling error of the analog to digital converters on the SPAM board. Ports 1 and 2 are tested as a pair using S21 and S12 measurements.
Page 66 Tests and Adjustments Performance Tests — Two test cables — Calibration kit — 10-dB and 20-dB pads if the analyzer does not have an internal step attenuator Description of the Test: For most analyzer models, the receiver compression level is higher than the maximum source output power.
Page 67: Noise Floor Test
Tests and Adjustments Performance Tests — If the analyzer still fails this test, replace the A23 mixer brick for a Port 1 or Port 2 failure or the A24 mixer brick for a Port 3 or Port 4 failure, then repeat this test.
Page 68: Calibration Coefficients Test
Tests and Adjustments Performance Tests 10.The corrected noise floor in dBm is calculated for a 10 Hz IF bandwidth using: PNoiseFloor = Ptest – 19.96 dB – (Preset Power – Pref). If the Analyzer Fails this Test: — If the analyzer fails this test, replace the A23 mixer brick for a Port 1 or Port 2 failure or the A24 mixer brick for a Port 3 or Port 4 failure, then repeat this test.
Page 69: Dynamic Accuracy Test
Tests and Adjustments Performance Tests — Failure of the source or load match error terms is due to faulty hardware between the test port and the internal source. Refer to Chapter 7, “Repair and Replacement Procedures.” for instructions on replacing the suspected faulty component or assembly.
Page 70: Noise State Calibration Coefficients
Tests and Adjustments Performance Tests 7. With the 1 dB of overlap in each measurement, the data for each attenuator setting can be stitched together to provide a complete receiver linearity profile from +3 dBm to -63 dBm. 8. This test is repeated for each receiver. If the Analyzer Fails this Test: —...
Page 71: Adjustments
Tests and Adjustments Adjustments Adjustments These adjustments are firmware-driven tests that are used to fine-tune your analyzer. If multiple adjustments are to be performed, perform them in the order listed. — “10 MHz Frequency Reference Adjustment” on page 3-41 — “Synthesizer Bandwidth Adjustment”...
Page 72: Synthesizer Bandwidth Adjustment
Tests and Adjustments Adjustments Figure 3-14 Equipment Setup for the 10 MHz Frequency Reference Adjustment Service Adjustments 2. Press UTILITY , then , then , then click System 10 MHz Freq Adjustment. 3. Ensure the GPIB settings are correct. 4. Follow the instructions and prompts as they are displayed. Synthesizer Bandwidth Adjustment This adjusts the bandwidth of the 13.5 GHz synthesizers.
Page 73: If Gain Adjustment
Tests and Adjustments Adjustments Procedure 1. Connect the equipment as shown in Figure 3-15. Connect a GPIB cable between the network analyzer and the power meter. Figure 3-15 Equipment Setup for the Source Adjustment Service Adjustments 2. .Press UTILITY System , then , then , then click...
Page 74: Receiver Adjustment
Tests and Adjustments Adjustments 2. Follow the instructions and prompts as they are displayed. Receiver Adjustment The receiver calibration is used to adjust the network analyzer receivers for a flat response across its full frequency range: 1. A power meter/sensor is connected to Port 1, as shown in Figure 3-16, to establish a reference for flatness.
Page 75 Tests and Adjustments Adjustments Figure 3-16 Equipment Setup 1 for the Receiver Adjustment Service Adjustments 2. Press UTILITY System , then , then , then click Receiver Adjustment. 3. Ensure the GPIB settings are correct. 4. Follow the instructions and prompts as they are displayed. Figure 3-17 Equipment Setup 2 for the Receiver Adjustment Keysight N5224A/25A Service Guide...
Page 76: Ee Default Adjustment
Tests and Adjustments Adjustments Figure 3-18 Equipment Setup 3 for the Receiver Adjustment EE Default Adjustment This sets the EEPROM data to their default values. Procedure Service Adjustments 1. Press UTILITY System , then , then , then click EE Default Adjustment.
Page 77: Troubleshooting
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Troubleshooting Information in This Chapter The information in this chapter helps you: — Identify the portion of the analyzer at fault. — Locate the specific troubleshooting procedure to identify the assembly or peripheral at fault.
Page 78: Chapter Four At-A-Glance
Troubleshooting Information in This Chapter Chapter Four at-a-Glance Section Title Summary of Content Start Page Getting Started with A starting point for troubleshooting. page 4-4 Troubleshooting Power Up Troubleshooting Power-up problems: page 4-6 — Power supply problems — LCD problems —...
Page 79: Operating The Analyzer With Covers Removed
Troubleshooting Operating the Analyzer With Covers Removed Operating the Analyzer With Covers Removed Do not operate the analyzer with the outer cover removed for more than 30 minutes, as this could cause the analyzer to overheat which could result in costly damage. Protect Against Electrostatic Discharge (ESD) This is important.
Page 80: Getting Started With Troubleshooting
Check the Basics A problem can often be solved by repeating the procedure you were following when the problem occurred. Before calling Keysight Technologies or returning the instrument for service, please perform the following checks: 1. Is there power at the mains receptacle? If not, correct this situation and proceed.
Page 81: Troubleshooting Organization
Troubleshooting Getting Started with Troubleshooting Troubleshooting Organization Follow the flowgraph in Figure 4-1 to help direct you to the correct section for troubleshooting the analyzer. Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” Go to “Front Panel Troubleshooting” Go to “Rear Panel Troubleshooting”...
Page 82: Power Up Troubleshooting
Troubleshooting Power Up Troubleshooting Power Up Troubleshooting Immediately unplug the instrument from the ac power line if the unit shows any of the following symptoms: — Smoke, arcing, or unusual noise from inside the analyzer. — A circuit breaker or fuse on the main ac power line opens. Check your network analyzer for evidence that it is powering up correctly.
Page 83: Power Supply Check
Troubleshooting Power Up Troubleshooting Power Supply Check There are no fuses to replace within the power supply. If you determine that the power supply is the failed assembly, replace the power supply. A catastrophic failure in the power supply can be determined by observing the line switch and the power supply LED indicators: 1.
Page 84 Troubleshooting Power Up Troubleshooting Figure 4-2 A19 Midplane Board Power Supply LED Indicators and Measurement Points The instrument contains potentially hazardous voltages. Refer to the safety symbols provided on the instrument and in “General Safety before operating the unit with the cover Considerations”...
Page 85 Troubleshooting Power Up Troubleshooting If any one individual voltage supply from the A20 power supply develops an over-voltage or over-current problem, all supplies are affected. The cause of the over-voltage or over-current condition can be the A20 power supply itself, or any assembly to which the A20 power supply provides voltage.
Page 86 Troubleshooting Power Up Troubleshooting 1. Unplug the A23 test set motherboard ribbon cable from the A23 test set motherboard (refer to “Removing and Replacing the A23 Test Set Motherboard” on page 7-29). 2. Unplug the A23 test set motherboard to A24 IF multiplexer board ribbon cable from the A24 IF multiplexer board (refer to “Removing and Replacing the A24 IF Multiplexer Board”...
Page 87 Troubleshooting Power Up Troubleshooting Check for shorts (zero Ω) or very low resistance (approximately 1 Ω). If a short or low resistance is measured, isolate each of the remaining four boards in the following order, and recheck the shorted test point after each board is removed.
Page 88: Troubleshooting Lcd Display Problems
Troubleshooting Power Up Troubleshooting Figure 4-3 Fan Power Cable Connections 3. If the correct voltage is present at each connection and the fan connectors are in good mechanical condition, suspect a defective fan. Refer to “Removing and Replacing the Fans” on page 7-60.
Page 89 Troubleshooting Power Up Troubleshooting 2. If the display is dark (not visible), connect an external VGA monitor to the rear panel Monitor output connector. (Be aware that some multisync monitors might not be able to lock to a 60 Hz sync pulse.) If the video information is not present on the external VGA monitor, the most probable cause is the A21 CPU board.
Page 90: Front Panel Troubleshooting
Troubleshooting Front Panel Troubleshooting Front Panel Troubleshooting The front panel assembly consists of the A1 front panel interface board, the keypad, the A2 USB board, and the A3 display assembly. The following tests verify the operation of the front panel assembly when the analyzer is in the measurement mode.
Page 91 Troubleshooting Front Panel Troubleshooting Figure 4-4 Front Panel Key Test Utility Dialog Box Checking the Front Panel Keys To check the front panel keys, push each key and compare the name in the Key Label box to the name physically labeled on the key cap. These names are also Table 4-2 below.
Page 92 Troubleshooting Front Panel Troubleshooting Table 4-2 Front Panel Keyboard Key Names TRACE/CHAN RESPONSE ENTRY ENTRY Keys Keys Keys Keys (Cont’d) Trace 4 Display Bk Sp Traces STIMULUS Keys Receiver Freq Navigation MARKER/ Power Keys ANALYSIS Keys Marker Sweep ← → Search Trigger ↑...
Page 93: A3 Display Test
Troubleshooting Front Panel Troubleshooting A3 Display Test The display should be bright with all annotations and text readable. The display test allows you to check for non-functioning pixels and other problems. If the display is dim or dark, refer to “Troubleshooting LCD Display Problems”...
Page 94: A1 Front Panel Interface Board
Troubleshooting Front Panel Troubleshooting — If the device does not perform correctly, the USB board is faulty. Refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-11. A1 Front Panel Interface Board This assembly performs the following functions: —...
Page 95: Rear Panel Troubleshooting
Troubleshooting Rear Panel Troubleshooting Rear Panel Troubleshooting Each rear panel connector is associated with a hardware group in the analyzer. You can use the data at these rear panel connectors to help troubleshoot these hardware groups in addition to testing the connectors. The connectors discussed in this section are: —...
Page 96: Lan Troubleshooting
Troubleshooting Rear Panel Troubleshooting 4. If the Window Desktop is not displayed, press UTILITY System , then Configure Control Panel... , then to view the Windows Taskbar menu at the bottom of the display. 5. On the Windows Taskbar menu, click Start then point to Programs, National Instruments NI-488.2, and then click Explore GPIB to open the Measurement &...
Page 97 Troubleshooting Rear Panel Troubleshooting The purpose of this section is to determine if the analyzer's hardware is functioning properly. While the turn-on self-test verifies some LAN hardware functionality, it is limited to internal testing only. Incorrect IP addresses will prevent proper operation. Improper subnet masks may allow only one-way communication, while improper gateway addresses may exclude outside LAN access.
Page 98 Troubleshooting Rear Panel Troubleshooting d. At the prompt, type ping xxx.xxx.xxx.xxx and press ENTRY Enter on the front panel. Refer to Step 5 for the results of a successful ping. 5. The analyzer attempts four cycles of communications with the indicated LAN device.
Page 99 Troubleshooting Rear Panel Troubleshooting panel. If full communication can be established, then the computer display shows the cycle time for each of four cycle attempts (similar to that in step 5). Other software may behave somewhat differently, but basically the same. If the analyzer can talk to the network, but the network can not talk to the analyzer, then the computer or device used from the network may have a subnet mask that excludes communication with the IP address chosen for the...
Page 100 Troubleshooting Rear Panel Troubleshooting Constructing a Crossover Cable A crossover cable can be made from a standard LAN cable by connecting pin 1 from each connector to pin 3 of the other connector, and pin 2 from each connector to pin 6 of the other connector. 1.
Page 101 Troubleshooting Rear Panel Troubleshooting Figure 4-5 Construction of a Crossover Cable Keysight N5224A/25A Service Guide 4-25...
Page 102: Measurement System Troubleshooting
Troubleshooting Measurement System Troubleshooting Measurement System Troubleshooting This section provides troubleshooting procedures for the measurement portion of the PNA. In this section, the analyzer is used as a tool to help isolate the suspected faulty functional group. Once the faulty functional group is determined, troubleshooting steps are provided to help you isolate the faulty assembly or part.
Page 103 EEPROM headers. The pc boards are listed by name and part number and the correct firmware revision code is given for each. Refer to: Appendix A:, “EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments),” on page To view this EEPROM header information on the network analyzer display:...
Page 104: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)
Troubleshooting Measurement System Troubleshooting Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode) The first step is to verify that the A, B,C, D, and R traces are present and that they are approximately level: — Connect an Open or Short standard from a mechanical calibration kit to each test port (use adapters if necessary).
Page 105: Where To Begin Troubleshooting
Troubleshooting Measurement System Troubleshooting Figure 4-8 Typical 5-Receiver Display for 4-Port Models — If all traces are present and are similar to the traces in Figure 4-7 Figure 4-8, then there are no major problems with the analyzer’s measurement system. There may, however, be a minor failure in the analyzer. To test further: —...
Page 106 Troubleshooting Measurement System Troubleshooting — A14 frequency reference — A4 and A17 13.5 GHz source synthesizers — A5 and A10 sources — A15 13.5 GHz LO synthesizer — A25 HMA26.5 — A26 splitter — A23 test set motherboard — the signal separation group —...
Page 107 Click the Hardware tab, click Device Manager, and then expand Keysight PNA DSP Device in the resulting list. The following entry should be listed: Keysight Technologies DSP Driver #2 and should be enabled. 2. If the entry is not present or if the icon to the left of the name is a...
Page 108: Checking The Source Group
Troubleshooting Measurement System Troubleshooting Checking the Source Group Source Group Tests Before checking the source group assemblies, you must open the analyzer. Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter. 1.
Page 109 Troubleshooting Measurement System Troubleshooting Equipment Setup 1. Before starting these checks, zero and calibrate the power meter. (See the power meter user’s guide for instructions on setting the calibration factor.) 2. If the Receiver Display (Figure 4-7 Figure 4-8) is not on the analyzer Service screen, perform the following: Press UTILITY , then...
Page 110 Troubleshooting Measurement System Troubleshooting — for LO related problems, continue testing at “Checking the A15 13.5 GHz LO Synthesizer Output”. — for source related problems, continue testing at “Checking the A4 and A17 Source Synthesizer Outputs” on page 4-37. Checking the A15 13.5 GHz LO Synthesizer Output 1.
Page 111 Troubleshooting Measurement System Troubleshooting 4. Refer to the NOTE notice on page 4-26. Set the network analyzer for an 800 MHz CW frequency and observe the spectrum analyzer measurement. For analyzers with DSP version 4.0, an 807.61 MHz signal should be present.
Page 112 Troubleshooting Measurement System Troubleshooting Figure 4-9 Comparison of Legacy HMA26.5 (5087-7765) and New HMA26.5 (N5240-60101) Checking the A26 Splitter Output IMPORTANT! Some PNAs have installed a legacy HMA26.5 (5087-7765) that is used with a discrete A26 splitter. Some PNAs have installed a new HMA26.5 (N5240-60101) with an integrated splitter.
Page 113 Troubleshooting Measurement System Troubleshooting 7. If the signal is present, reconnect cables W53 and W54, and then continue with “Checking the Receiver Group” on page 4-42. Checking the A4 and A17 Source Synthesizer Outputs 1. Refer to the block diagram at the end of this chapter and to “Top Assemblies and Cables, All Options”...
Page 114 Troubleshooting Measurement System Troubleshooting 5. Refer to the NOTE notice on page 4-26. If the observed problem was frequency banded rather than broadband related, set the analyzer frequency to the center of the problem band. The spectrum analyzer should measure a signal above the network analyzer setting. For analyzers with DSP version 4.0, the signal is 7.61 MHz above the network analyzer setting.
Page 115: Checking The Signal Separation Group
Troubleshooting Measurement System Troubleshooting Checking the Signal Separation Group Before checking the signal separation group assemblies, you must open the analyzer. Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter. 1.
Page 116 Troubleshooting Measurement System Troubleshooting 2. If the Receiver Display (Figure 4-7 Figure 4-8) is not on the analyzer Service screen, perform the following: Press UTILITY , then , then System Utilities Receiver Display , then 3. Set the sweep speed for a 10 second sweep: Press STIMULUS Sweep Sweep Time then...
Page 117 Troubleshooting Measurement System Troubleshooting — A38, A39, A40, or A41 source step attenuator — A42, A43, A44, or A45 bias tee — A33, A34, A35, and A36 test port coupler Equipment Used for These Tests Equipment Type Model or Alternate Model or Part Part Number Number Spectrum analyzer...
Page 118: Checking The Receiver Group
Troubleshooting Measurement System Troubleshooting 5. If the 800 MHz signal is present and the analyzer has source attenuators and bias tees, reconnect the cable to the receiver coupler and continue testing at “Checking the A38, A39, A40, and A41 60-dB Source Step Attenuators”...
Page 119 Troubleshooting Measurement System Troubleshooting — “Bottom RF Cables, Standard 2-Port Configuration, Option 200” on page 6-25 — “2-Port Configuration, Option 219” on page 6-49 — “Bottom RF Cables, 2-Port, Option 219” on page 6-51 — “4-Port Configuration, Option 400” on page 6-56 —...
Page 120 Troubleshooting Measurement System Troubleshooting — Receiver R2; W63 of A27 — Receiver B; W64 of A27 — 4-port models — Receiver A; W61 of A27 — Receiver R1; W62 of A27 — Receiver R2; W63 of A27 — Receiver B; W64 of A27 —...
Page 121 Troubleshooting Measurement System Troubleshooting Checking the A46, A47, A48, and A49 35-dB Receiver Step Attenuators 1. Locate the appropriate semirigid cable at the output of the receiver step attenuator to be checked: — Options 219 and 419 — Port 1; W98 of A46 —...
Page 122 Troubleshooting Measurement System Troubleshooting 4. Refer to Note on page 4-26. The measured signal on the spectrum analyzer should be at 7.61 MHz (analyzers with DSP version 4.0), or 7.44 MHz (analyzers with DSP version 5.0), and 1 GHz. 5. If the measured signal is present, replace the A16 SPAM board. Refer to “Removing and Replacing the A4–A17 Boards”...
Page 123: Instrument Block Diagrams Sheet 1
Troubleshooting Instrument Block Diagrams Sheet 1 Instrument Block Diagrams Sheet 1 Microwave PNA, N522xA, 2–Port Keysight N5224A/25A Service Guide 4-47...
Page 124 N5224A/25A 2-Port Overall Block Diagram (Includes Options 200-Standard; 201-Configurable Test Set; 217-Attenuators; and 219-Bias Tees) Service Guide: N5225-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz OPTION 200 OR 210 ADC MODULE (SPAM) IF = 7.438 MHz for CW Freq >...
Page 125: Instrument Block Diagrams Sheet 2
Troubleshooting Instrument Block Diagrams Sheet 2 Instrument Block Diagrams Sheet 2 Microwave PNA, N522xA, 4–Port Keysight N5224A/25A Service Guide 4-49...
Page 126 N5224A/25A 4-Port Overall Block Diagram (Includes Options 400-Standard; 401-Configurable Test Set; 4 17-Attenuators; and 419-Bias Tees Service Guide: N5225-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz OPTION 400 OR 410 ADC MODULE (SPAM) IF = 7.438 MHz for CW Freq >...
Page 127: Theory Of Operation
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Theory of Operation Information in This Chapter This chapter provides a general description of the operating theory of the N522xA 2-port and 4-port PNA microwave network analyzers. — Theory of operation is explained to the assembly level only. —...
Page 128 Theory of Operation Information in This Chapter Section Title Summary of Content Start Page Digital Processing and Digital Operation of the assemblies associated with digital page 5-28 Control Group Operation processing and digital control. Power Supply Group Operation Operation of the power supply assembly group. page 5-33 Keysight N5224A/25A Service Guide...
Page 129: Network Analyzer System Operation
Theory of Operation Network Analyzer System Operation Network Analyzer System Operation The PNA network analyzer generates two (2-port models) or four (4-port models) phase-locked incident signals and an LO signal from the internal synthesized source. By means of signal separation, the incident signals are divided into reference signals and test signals.
Page 130: Functional Groups Of The Network Analyzer
Theory of Operation Network Analyzer System Operation Figure 5-2 2-Port System Simplified Block Diagram Functional Groups of the Network Analyzer The operation of the network analyzer can be separated into major functional groups. Each group consists of assemblies that perform a distinct function in the instrument.
Page 131 Theory of Operation Network Analyzer System Operation Synthesized Source Group The built-in synthesized source generates a swept, stepped, or continuous wave (CW) signal in the frequency ranges as listed in the Data Sheet and Technical Specifications documents, available online at: https://www.keysight.com/us/en/assets/9018-04042/technical-specificatio ns/9018-04042.pdf (N5224-90001) and...
Page 132 Theory of Operation Network Analyzer System Operation Receiver Group The receiver converts the test and reference signals to 7.438 MHz intermediate frequency (IF) signals for signal processing, retaining both magnitude and phase characteristics. The IF signals are converted to digital information by the digital processing group.
Page 133: Synthesized Source Group Operation
Theory of Operation Synthesized Source Group Operation Synthesized Source Group Operation Refer to the Note notice on page 5-1. The source group produces a stable output signal by phase locking a synthesized voltage-controlled oscillator (VCO). For the full frequency range of the source, refer to the Data Sheet and Technical Specifications documents, available online at: https://www.keysight.com/us/en/assets/9018-04042/technical-specificatio...
Page 134 Theory of Operation Synthesized Source Group Operation this LO signal with the test signal output is a constant 7.438 MHz IF; except for frequencies below 53 MHz when the IF is 0.826 MHz. This IF signal is sent to the A16 SPAM board for digital processing. The A4 13.5 GHz synthesizer board produces an incident signal that is sent through the A5 26.5 GHz source board and then through the A7 and A8 doubler boards to the front panel outputs.
Page 135 Theory of Operation Synthesized Source Group Operation Figure 5-3 Source Group Keysight N5224A/25A Service Guide...
Page 136 Theory of Operation Synthesized Source Group Operation Band Mixer Brick L.O. A4/A17 A5/A10 A7/A8/A12/A1 Harm Synthesizer HMA26.5 Synthesizer Source 3 50GHz Frequency (GHz) Frequency (GHz) Frequency Frequency Doubler Nmbr (GHz) (GHz) Frequency (GHz) 0.01083 to 0.05383 0.01083 to 0.05383 0.010 to 0.053 0.010 to 0.053 0.010 to 0.053 0.06044 to 0.18244...
Page 137: A4, A15, And A17 13.5 Ghz Synthesizer Boards
Theory of Operation Synthesized Source Group Operation Band Mixer Brick L.O. A4/A17 A5/A10 A7/A8/A12/A1 Harm Synthesizer HMA26.5 Synthesizer Source 3 50GHz Frequency (GHz) Frequency (GHz) Frequency Frequency Doubler Nmbr (GHz) (GHz) Frequency (GHz) 12.0037 to 13.2537 24.0074 to 26.5074 12.000 to 12.000 to 24.000 to 13.250...
Page 138: A5 And A10 26.5 Ghz Source Boards
Theory of Operation Synthesized Source Group Operation In bands 11-30, the swept VCO signal is passed through a doubler circuit where the signal for some bands are sent directly to the output of the synthesizer board while other bands are passed through another doubler circuit then to the output of the synthesizer board to produce the output frequencies listed in Table...
Page 139: A25 Multiplier/Amplifier 26.5 Board (Hma26.5)
Theory of Operation Synthesized Source Group Operation For bands 16–18, the input signals of all four doubler boards are amplified and filtered, then sent to the doubler board output. For bands 19–30, the input signals of all four doubler boards are doubled, amplified and filtered, then sent to the doubler board output.
Page 140: A14 Frequency Reference Board
Theory of Operation Synthesized Source Group Operation A14 Frequency Reference Board This assembly provides stable reference frequencies to the rest of the instrument. A high stability 10 MHz oven-controlled crystal oscillator (OCXO) normally provides the frequency standard. However, if a 10 MHz external reference signal is detected at the 10 MHz EXT REF IN port on the rear panel, it is used as the frequency reference instead.
Page 141 Theory of Operation Synthesized Source Group Operation HANDLER I/O A rectangular 36-pin, female connector providing four independent parallel input/output ports, nine control signal lines, one ground, and a power supply line. This connector has Type 2 output pin assignments as listed in Table 5-2 on page 5-16.
Page 142 Theory of Operation Synthesized Source Group Operation Table 5-2 HANDLER I/O Connector Pin Assignments Table 5-3 Table 5-4 Table 5-5 Rectangular 36-Pin Female Connector Pin Numbers Name Function 0 V, ground reference INPUT1 TTL in, negative pulse (1 μs min) latches OUTPUT1-2 3–4 OUTPUT1–2 TTL out, latched...
Page 143 Theory of Operation Synthesized Source Group Operation Table 5-6 PWR I/O Connector Pin Assignments DB-9 Female Connector Name Description +15V +15 V @ 400 mA -15V -15 V @ 400 mA AnalogOut1 Analog Output Voltage Programmable ±10 V @ 100 mA out Nominally 0 ohms 2.44 mV typical resolution 1 MHz BW...
Page 144: Signal Separation Group Operation
Theory of Operation Signal Separation Group Operation Signal Separation Group Operation The signal separation group divides the source incident signals into a reference path and a test path. Refer to Figure 5-4 on page 5-21 Figure 5-5 on page 5-22. —...
Page 145: A29-A32 Receiver Couplers
Theory of Operation Signal Separation Group Operation — the A34 test port 3 coupler and the A28 mixer brick receiver C — the A35 test port 4 coupler and the A28 mixer brick receiver D — the A36 test port 2 coupler and the A27 mixer brick receiver B Normal Measurement Configuration For those models equipped with a configurable test set and source attenuators, with the inclusion of an external amplifier and accessories, you...
Page 146: A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees
Theory of Operation Signal Separation Group Operation A38–A41 60-dB Source Step Attenuators and A42–A45 Bias Tees On selected 4-port models, a step attenuator and a bias tee are placed in the signal path of each test port between the A29–A32 receiver couplers and the A33–A36 test port couplers.
Page 147 Theory of Operation Signal Separation Group Operation Figure 5-4 4-Port Signal Separation Group Keysight N5224A/25A Service Guide 5-21...
Page 148 Theory of Operation Signal Separation Group Operation Figure 5-5 2-Port Signal Separation Group 5-22 Keysight N5224A/25A Service Guide...
Page 149: Receiver Group Operation
Theory of Operation Receiver Group Operation Receiver Group Operation The receiver group measures and processes the input signals into digital information for processing and eventual display. Figure 5-6 on page 5-26 Figure 5-7 on page 5-27 are simplified block diagrams of the receiver functional group for 2-port and 4-port models.
Page 150: A16 Spam Board (Analog Description)
Theory of Operation Receiver Group Operation models) are mixed with a synthesized LO signal that is 7.438 MHz higher than the source incident signal to produce a 7.438 MHz IF signal. This synthesized LO comes from the A25 HMA26.5 (via the A26 splitter for 4-port models). At frequencies below 53 MHz, the IF is set to 0.826 MHz.
Page 151 Theory of Operation Receiver Group Operation Rear Panel Interconnects The A24 IF multiplexer board includes the following rear panel interconnects. PULSE I/O A DB-15 female connector. Pin assignments are listed in Table 5-7 on page 5-25. Table 5-7 PULSE I/O Connector Pin Assignments DB-15 Female Connector Name Description...
Page 152 Theory of Operation Receiver Group Operation Figure 5-6 4-Port Receiver Group 5-26 Keysight N5224A/25A Service Guide...
Page 153 Theory of Operation Receiver Group Operation Figure 5-7 2-Port Receiver Group Keysight N5224A/25A Service Guide 5-27...
Page 154: Digital Processing And Digital Control Group Operation
Theory of Operation Digital Processing and Digital Control Group Operation Digital Processing and Digital Control Group Operation The digital processor and control group provides digital control for the entire analyzer. It provides: — front panel operation, — output to the display, —...
Page 155 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-8 Digital Processing and Digital Control Group Keysight N5224A/25A Service Guide 5-29...
Page 156: Front Panel Subgroup
Theory of Operation Digital Processing and Digital Control Group Operation Front Panel Subgroup The front panel subgroup contains the following assemblies: — A1 Front Panel Display Board — A2 USB Board — A3 Display Assembly — Keypad Assembly A1 Front Panel Display Board The A1 front panel display board detects and decodes user inputs from the keypad assembly and front panel knob, and transmits them to the A21 CPU board by way of the A18 system motherboard.
Page 157: Data Acquisition And Processing Subgroup
Theory of Operation Digital Processing and Digital Control Group Operation Keypad Assembly The keypad assembly provides user interface to the analyzer. The front panel rotary pulse generator (RPG) knob is not electrically connected to the keypad, but rather provides user inputs directly to the front panel processor. Data Acquisition and Processing Subgroup The data acquisition and processing subgroup contain the following assemblies.
Page 158 Theory of Operation Digital Processing and Digital Control Group Operation Main RAM The main random access memory (RAM) is shared memory for the CPU and the DSP. It stores the raw data received from the DSP while additional calculations are performed on it by the CPU. The CPU reads the resulting formatted data from the main RAM, converts it to a user-definable display format, and writes this to the video processor for display.
Page 159: Power Supply Group Operation
Theory of Operation Power Supply Group Operation Power Supply Group Operation The A20 power supply assembly is a switching power supply operating at 103 kHz switching frequency. The input power ranges for the power supply are 90 to 132 Vac or 195 to 250 Vac. The power supply automatically senses the input voltage and switches between these two ranges.
Page 160 Theory of Operation Power Supply Group Operation 5-34 Keysight N5224A/25A Service Guide...
Page 161: Replaceable Parts
Rebuilt-Exchange Assemblies The definition of a rebuilt-exchange assembly. page 6-4 The procedure for replacing and returning a defective assembly to Keysight Technologies. Replaceable Parts Listings Tables that list the assemblies by reference designator with page 6-6 their associated part number and description.
Page 162: Ordering Information
Ordering Information To order a part listed in the replaceable parts lists: — include the part number — indicate the quantity required — Contact Keysight Technologies for instructions on where to send the order. Refer to “Contacting Keysight” on page 2-7.
Page 163: Assembly Replacement Sequence
Replaceable Parts Assembly Replacement Sequence Assembly Replacement Sequence The following steps describe how to replace an assembly in the network analyzer. Step 1. Identify the faulty group. Begin with Chapter 4, “Troubleshooting.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly.
Page 164: Rebuilt-Exchange Assemblies
Replaceable Parts Rebuilt-Exchange Assemblies Rebuilt-Exchange Assemblies Under the rebuilt-exchange assembly program: — Certain factory-repaired and tested assemblies are available on a trade-in basis. — Exchange assemblies are offered for lower cost than a new assembly, but meet all factory specifications required of a new assembly. —...
Page 165 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5224A/25A Service Guide...
Page 166: Replaceable Parts Listings
Replaceable Parts Replaceable Parts Listings Replaceable Parts Listings This section contains the replacement part numbers and their descriptions for your Keysight microwave PNA. You can find the locations of replaceable parts in this section: — listed by reference designator in Table 6-1, or —...
Page 167 Replaceable Parts Replaceable Parts Listings Table 6-1 Part Number Listing by Reference Designator (Continued) Reference Description Location Designator Testset motherboard Your option set determines which assemblies are in your PNA. Refer to IF multiplexer board “Bottom Assemblies and Cables by Option Set:”...
Page 168 Replaceable Parts Replaceable Parts Listings Table 6-1 Part Number Listing by Reference Designator (Continued) Reference Description Location Designator Test port 1 6-dB attenuator Your option set determines which assemblies are in your PNA. Refer to Test port 3 6-dB attenuator “Bottom Assemblies and Cables by Option Set:”...
Page 169 Replaceable Parts Replaceable Parts Listings Table 6-2 Part Number Listing by Type of Part — “Fan Assemblies, All Options” on page 6-101 — “Top Hardware and Miscellaneous Parts, All Options” on page 6-103 — “Bottom Hardware and Miscellaneous Parts” on page 6-105 —...
Page 170: Front Panel Assembly, Front Side, All Options
Replaceable Parts Replaceable Parts Listings Front Panel Assembly, Front Side, All Options The N5245-60024 (Was N5247-60004) 2-port front panel assembly and the N5245-60022 (Was N5247-60005) 4-port front panel assembly contain the items shown in the following table. Reference Part Number Description Designator N5247-20137...
Page 171 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5224A/25A Service Guide 6-11...
Page 172: Front Panel Assembly, Back Side, All Options
Replaceable Parts Replaceable Parts Listings Front Panel Assembly, Back Side, All Options Reference Part Number Description Designator N5240-63065 Front panel interface board Was N5240-63046 N5240-60063 USB board Was N5240-60047 Not shown N5242-60010 Ribbon cable, 60-wire, A18 system motherboard J9 to A1 front panel interface board J1 N5242-40001 Keypad assembly...
Page 173 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Designator Display assembly: 0515-2329 (LED) Machine screw, M3.0 x 10 pan head (To attach LCD display to bracket.) 0515-0664 (Tube) critical footnote 2090-1036 (LED) LCD display 2090-0883 (Tube) critical footnote Display assembly (continued from previous page): N5242-20121 Spacers (For display hold down bracket standoffs.) For use with LCD (Tube)
Page 174 Replaceable Parts Replaceable Parts Listings Figure 6-3 Front Panel Assembly, Back Side, All Options Figure 6-4 A3 Display Assembly with Old LCD Display 2090-0883 6-14 Keysight N5224A/25A Service Guide...
Page 175 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Keysight N5224A/25A Service Guide 6-15...
Page 176: Top Assemblies And Cables, All Options
Replaceable Parts Replaceable Parts Listings Top Assemblies and Cables, All Options When replacing an old assembly, install an assembly with either the same part number or the new part number. Top Assemblies, All Options Referenc Serial Number Part Number Description Prefixes Designat Affected...
Page 177 Replaceable Parts Replaceable Parts Listings Referenc Serial Number Part Number Description Prefixes Designat Affected All prefixes – N5242-60133 Solid state drive (SSD) for Windows 7 Operating System- Version 7 Was: N5242-60088 to be used with the Version 7, System CPU All prefixes –...
Page 178 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Options 6-18 Keysight N5224A/25A Service Guide...
Page 179 Replaceable Parts Replaceable Parts Listings This page is intentionally left blank. Keysight N5224A/25A Service Guide 6-19...
Page 180: Top Cables, All Cables-All Options
Replaceable Parts Replaceable Parts Listings Top Cables, All Cables—All Options Ref. Part Number Description Type Desig. N5245-20114 A4 13.5 GHz (source 1) synthesizer board J1207 to A5 26.5 GHz source (1) board P1 N5245-20100 A10 source (2) P1 to A17 13.5 GHz source (2) synthesizer J1207 N5245-20034 A5 source (1) P5 to A7 port 1 doubler N5245-20035...
Page 181 Replaceable Parts Replaceable Parts Listings Ref. Part Number Description Type Desig. 8120-5063 A14 frequency reference board J3 to rear-panel 10 MHz REF OUT Rear-panel 10 MHz REF IN to A14 frequency reference board J2 W149 N5247-60023 A24 IF multiplexer board P603 to A16 SPAM board J2 W150 N5247-60024 A24 IF multiplexer board P203 to A16 SPAM board J5...
Page 182 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Cables—All Options 6-22 Keysight N5224A/25A Service Guide...
Page 183: 2-Port Configuration, Option 200
Replaceable Parts Replaceable Parts Listings 2-Port Configuration, Option 200 Bottom Assemblies, Standard 2-Port Configuration, Option 200 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 184 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, Standard 2-Port Configuration, Option 200 6-24 Keysight N5224A/25A Service Guide...
Page 185 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, Standard 2-Port Configuration, Option 200 Reference Part Number Description Type Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20111 A32 port 2 receiver coupler to W17 W111 N5224-20012 A29 port 1 receiver coupler to A33 port 1 coupler W107 N5224-20005 A29 port 1 receiver coupler to mixer brick (R1) via A68 3 dB pad...
Page 186 Replaceable Parts Replaceable Parts Listings Figure 6-9 Bottom RF Cables, Standard 2-Port Configuration, Option 200 6-26 Keysight N5224A/25A Service Guide...
Page 187 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5225-60001 A23 test set motherboard J221 to ports 1/3 LED board J1 ...
Page 188 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 6-28 Keysight N5224A/25A Service Guide...
Page 189: 2-Port Configuration, Option 201
Replaceable Parts Replaceable Parts Listings 2-Port Configuration, Option 201 Bottom Assemblies, 2-Port, Option 201 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler...
Page 190 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, 2-Port, Option 201 6-30 Keysight N5224A/25A Service Guide...
Page 191 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 2-Port, Option 201 Reference Part Number Description Type Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20111 A32 port 2 receiver coupler to W17 N5245-20039 A29 port 1 receiver coupler to front-panel Port 1 SOURCE OUT N5245-20045 Port 1 CPLR THRU to A33 port 1 coupler N5245-20120...
Page 192 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator W149 & Refer to “Top Cables, All Cables—All Options” on page 6-20. W150 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-32 Keysight N5224A/25A Service Guide...
Page 193 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom RF Cables, 2-Port, Option 201 Keysight N5224A/25A Service Guide 6-33...
Page 194 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 201 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  8121-0966 A23 test set motherboard J554 to A37 reference mixer switch ...
Page 195 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 201 Keysight N5224A/25A Service Guide 6-35...
Page 196: 2-Port Configuration, Option 210
Replaceable Parts Replaceable Parts Listings 2-Port Configuration, Option 210 Bottom Assemblies, 2-Port, Option 210 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler...
Page 197 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Assemblies, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-37...
Page 198 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 2-Port, Option 210 Reference Part Number Description Type Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20111 A32 port 2 receiver coupler to W17 W123 N5224-20008 A29 port 1 receiver coupler to A64 6-dB attenuator W107 N5224-20005 A29 port 1 receiver coupler to mixer brick (R1) via A68 3 dB pad...
Page 199 Replaceable Parts Replaceable Parts Listings Figure 6-15 Bottom RF Cables, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-39...
Page 200 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 210 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5225-60001 A23 test set motherboard J221 to ports 1/3 LED board J1 ...
Page 201 Replaceable Parts Replaceable Parts Listings Figure 6-16 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-41...
Page 202: 2-Port Configuration, Option 217
Replaceable Parts Replaceable Parts Listings 2-Port Configuration, Option 217 Bottom Assemblies, 2-Port, Option 217 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler...
Page 203 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom Assemblies, 2-Port, Option 217 Keysight N5224A/25A Service Guide 6-43...
Page 204 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 2-Port, Option 217 Reference Part Number Description Type Designator N5245-20050 A29 port 1 receiver coupler to W11 N5245-20049 A32 port 2 receiver coupler to W17 N5245-20045 Front panel port 1 CPLR THRU to A33 port 1 coupler N5245-20118 A29 port 1 receiver coupler to A37 reference mixer switch N5245-20025...
Page 205 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B)
Page 206 Replaceable Parts Replaceable Parts Listings Figure 6-18 Bottom RF Cables, 2-Port, Option 217 6-46 Keysight N5224A/25A Service Guide...
Page 207 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 217 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5245-60006 A23 test set motherboard J549 to A38 port 1 source attenuator ...
Page 208 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 217 6-48 Keysight N5224A/25A Service Guide...
Page 209: 2-Port Configuration, Option 219
Replaceable Parts Replaceable Parts Listings 2-Port Configuration, Option 219 Bottom Assemblies, 2-Port Configuration, Option 219 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 210 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom Assemblies, 2-Port, Option 219 6-50 Keysight N5224A/25A Service Guide...
Page 211 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 2-Port, Option 219 Reference Part Number Description Type Designator N5245-20050 A29 port 1 receiver coupler to W11 N5245-20049 A32 port 2 receiver coupler to W17 N5245-20118 A29 port 1 receiver coupler to A37 reference mixer switch N5245-20025 A33 port 1 coupler to front-panel REF 1 CPLR ARM N5245-20010...
Page 212 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5245-20030 Front-panel Port 2 CPLR THRU to A45 port 2 bias tee N5245-20047 A36 port 2 coupler to A45 port 2 bias tee N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103...
Page 213 Replaceable Parts Replaceable Parts Listings Figure 6-21 Bottom RF Cables, 2-Port, Option 219 Keysight N5224A/25A Service Guide 6-53...
Page 214 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5245-60006 A23 test set motherboard J549 to A38 port 1 source attenuator ...
Page 215 Replaceable Parts Replaceable Parts Listings Figure 6-22 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219 Keysight N5224A/25A Service Guide 6-55...
Page 216: 4-Port Configuration, Option 400
Replaceable Parts Replaceable Parts Listings 4-Port Configuration, Option 400 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5067-4086 Splitter 5087-7323 Mixer brick 5087-6323...
Page 217 Replaceable Parts Replaceable Parts Listings Figure 6-23 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Keysight N5224A/25A Service Guide 6-57...
Page 218 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, Standard 4-Port Configuration, Option 400 Reference Part Number Description Type Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20043 A30 port 3 receiver coupler to W13 N5245-20044 A31 port 4 receiver coupler to W15 N5245-20111 A32 port 2 receiver coupler to W17 W111...
Page 219 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5242-60024 A28 mixer brick (D) to A24 IF multiplexer (P801) N5242-60019 A28 mixer brick (R4) to A24 IF multiplexer (P414) N5242-60020 A28 mixer brick (R3) to A24 IF multiplexer (P413) N5242-60023 A28 mixer brick (C) to A24 IF multiplexer (P601) W69-73,...
Page 220 Replaceable Parts Replaceable Parts Listings Figure 6-24 Bottom RF Cables, Standard 4-Port Configuration, Option 400 6-60 Keysight N5224A/25A Service Guide...
Page 221 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 ...
Page 222 Replaceable Parts Replaceable Parts Listings Figure 6-25 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 6-62 Keysight N5224A/25A Service Guide...
Page 223: 4-Port Configuration, Option 401
Replaceable Parts Replaceable Parts Listings 4-Port Configuration, Option 401 Bottom Assemblies, 4-Port, Option 401 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5067-4086 Splitter 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 224 Replaceable Parts Replaceable Parts Listings Figure 6-26 Bottom Assemblies, 4-Port, Option 401 6-64 Keysight N5224A/25A Service Guide...
Page 225 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 401 Reference Type Part Number Description Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20043 A30 port 3 receiver coupler to W13 N5245-20044 A31 port 4 receiver coupler to W15 N5245-20111 A32 port 2 receiver coupler to W17 N5245-20039...
Page 226 Replaceable Parts Replaceable Parts Listings Reference Type Part Number Description Designator N5245-20006 REF 1 RCVR R1 IN to A37 reference mixer switch N5245-20009 A37 reference mixer switch to A27 mixer brick (R1) N5245-20020 REF 3 RCVR R3 IN to A28 mixer brick (R3) N5245-20021 REF 4 RCVR R4 IN to A69 3 dB pad on A28 mixer brick (R4) N5245-20011...
Page 227 Replaceable Parts Replaceable Parts Listings Figure 6-27 Bottom RF Cables, 4-Port, Option 401 Keysight N5224A/25A Service Guide 6-67...
Page 228 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 401 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 ...
Page 229 Replaceable Parts Replaceable Parts Listings Figure 6-28 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 401 Keysight N5224A/25A Service Guide 6-69...
Page 230: 4-Port Configuration, Option 410
Replaceable Parts Replaceable Parts Listings 4-Port Configuration, Option 410 Bottom Assemblies, 4-Port, Option 410 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5067-4086 Splitter 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 231 Replaceable Parts Replaceable Parts Listings Figure 6-29 Bottom Assemblies, 4-Port, Option 410 Keysight N5224A/25A Service Guide 6-71...
Page 232 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 410 Reference Part Number Description Type Designator N5245-20109 A29 port 1 receiver coupler to W11 N5245-20043 A30 port 3 receiver coupler to W13 N5245-20044 A31 port 4 receiver coupler to W15 N5245-20111 A32 port 2 receiver coupler to W17 W119...
Page 233 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5242-60018 A27 mixer brick (B) to A24 IF multiplexer (P201) N5242-60024 A28 mixer brick (D) to A24 IF multiplexer (P801) N5242-60019 A28 mixer brick (R4) to A24 IF multiplexer (P414) N5242-60020 A28 mixer brick (R3) to A24 IF multiplexer (P413) N5242-60023...
Page 234 Replaceable Parts Replaceable Parts Listings Figure 6-30 Bottom RF Cables, 4-Port, Option 410 6-74 Keysight N5224A/25A Service Guide...
Page 235 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 410 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 ...
Page 236 Replaceable Parts Replaceable Parts Listings Figure 6-31 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 410 6-76 Keysight N5224A/25A Service Guide...
Page 237: 4-Port Configuration, Option 417
Replaceable Parts Replaceable Parts Listings 4-Port Configuration, Option 417 Bottom Assemblies, 4-Port, Option 417 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5067-4086 Splitter 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 238 Replaceable Parts Replaceable Parts Listings Figure 6-32 Bottom Assemblies, 4-Port, Option 417 6-78 Keysight N5224A/25A Service Guide...
Page 239 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 417 (Ports 1 and 2) Reference Part Number Description Type Designator N5245-20050 A29 port 1 receiver coupler to W11 N5245-20049 A32 port 2 receiver coupler to W17 N5245-20099 Front panel port 1 CPLR THRU to A33 port 1 coupler N5245-20008 A29 port 1 receiver coupler to A37 reference mixer switch N5245-20014...
Page 240 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator...
Page 241 Replaceable Parts Replaceable Parts Listings Figure 6-33 Bottom RF Cables, 4-Port, Option 417 (Ports 1 and 2) Keysight N5224A/25A Service Guide 6-81...
Page 242 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 417 (Ports 3 and 4) Reference Part Number Description Type Designator N5245-20043 A30 port 3 receiver coupler to W13 N5245-20044 A31 port 4 receiver coupler to W15 N5245-20098 Front panel port 3 CPLR THRU to A34 port 3 coupler N5245-20116 A30 port 3 receiver coupler to front-panel REF 3 SOURCE OUT N5245-20015...
Page 243 Replaceable Parts Replaceable Parts Listings b. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-15 on page 36 and cabling, refer to your option-model in Chapter 6...
Page 244 Replaceable Parts Replaceable Parts Listings Figure 6-34 Bottom RF Cables, 4-Port, Option 417 (Ports 3 and 4) 6-84 Keysight N5224A/25A Service Guide...
Page 245 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 417 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5245-60006 A23 test set motherboard J549 to A38 port 1 source attenuator ...
Page 246 Replaceable Parts Replaceable Parts Listings Figure 6-35 Bottom Ribbon Cables & Wire Harnesses, 4-Port, Option 417 6-86 Keysight N5224A/25A Service Guide...
Page 247: 4-Port Configuration, Option 419
Replaceable Parts Replaceable Parts Listings 4-Port Configuration, Option 419 Bottom Assemblies, 4-Port, Option 419 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 IF multiplexer board N5240-60062 Was N5240-60045 5087-7765 LO Multiplier/amplifier 26.5 (HMA26.5) 5067-4086 Splitter 5087-7323 Mixer brick 5087-6323 5087-7760 Test port 1 receiver coupler...
Page 248 Replaceable Parts Replaceable Parts Listings c. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-15 on page 36 and cabling, refer to your option-model in Chapter 6...
Page 249 Replaceable Parts Replaceable Parts Listings Figure 6-36 Bottom Assemblies, 4-Port, Option 419 Keysight N5224A/25A Service Guide 6-89...
Page 250 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2) Reference Part Number Description Type Designator N5245-20050 A29 port 1 receiver coupler to W11 N5245-20049 A32 port 2 receiver coupler to W17 N5245-20008 A29 port 1 receiver coupler to A37 reference mixer switch N5245-20014 A33 port 1 coupler to front-panel Port 1 CPLR ARM N5245-20010...
Page 251 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20030 Port 2 CPLR THRU to A45 port 2 bias tee N5245-20087 A45 port 2 bias tee to A36 port 2 coupler N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056...
Page 252 Replaceable Parts Replaceable Parts Listings Figure 6-37 Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2) 6-92 Keysight N5224A/25A Service Guide...
Page 253 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4) Reference Part Number Description Type Designator N5245-20043 A30 port 3 receiver coupler to W13 N5245-20044 A31 port 4 receiver coupler to W15 N5245-20116 A30 port 3 receiver coupler to front-panel REF 3 SOURCE OUT N5245-20015 A34 port 3 coupler to front-panel Port 3 CPLR ARM N5245-20117...
Page 254 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator W149 & Refer to “Top Cables, All Cables—All Options” on page 6-20. W150 N5247-20138 Dust cap, A28 mixer brick termination  a. SR = semirigid coaxial cable; F = flexible coaxial cable b.
Page 255 Replaceable Parts Replaceable Parts Listings Figure 6-38 Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4) Keysight N5224A/25A Service Guide 6-95...
Page 256 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A23 test set motherboard J301  N5245-60006 A23 test set motherboard J549 to A38 port 1 source attenuator ...
Page 257 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator 100R N5242-60004 A18 system motherboard J1 to A23 test set motherboard J1 to A24 IF multiplexer board J1 E4410-60160 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a.
Page 258 Replaceable Parts Replaceable Parts Listings Figure 6-39 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419 6-98 Keysight N5224A/25A Service Guide...
Page 259: Rear Panel Assembly, All Options
Replaceable Parts Replaceable Parts Listings Rear Panel Assembly, All Options Item Part Description Number Number N5245-00028 Power supply rear panel bracket  0515-0372 Machine screw, M3.0 x 8, pan head (To attach: CPU assy to ejector arms  and left and right side inner brackets, RP to chassis, power supply bracket to the power supply and rear panel, handler I/O cable to rear panel, test set deck to rear panel.) N5242-60044...
Page 260 Replaceable Parts Replaceable Parts Listings Item Part Description Number Number 6960-0523 Hole plug 2190-0102 Lock washer 2950-0035 Hex nut 8120-5063 BNC cable a. This part number is no longer required on s/n’s 5541, 5542, 5544, 5545, 5547, 5549 and newer. But, is included for your ref- erence.
Page 261: Fan Assemblies, All Options
Replaceable Parts Replaceable Parts Listings Fan Assemblies, All Options Reference Part Number Description Designator 3160-4199 3160-0281 Fan guard  Was 3160-4198 0361-1272 Fan rivet  N5245-00006 Fan bracket (for 2 fans)  N5245-00003 Fan bracket (for 3 fans)  0515-0372 Machine screw, M3.0 x 8, pan head (To attach: 7 to attach the 2-fan assy to ...
Page 262 Replaceable Parts Replaceable Parts Listings Figure 6-41 Fan Assemblies, Side View, All Options 6-102 Keysight N5224A/25A Service Guide...
Page 263: Top Hardware And Miscellaneous Parts, All Options
Replaceable Parts Replaceable Parts Listings Top Hardware and Miscellaneous Parts, All Options Reference Part Number Description Designator W1312-00062 Bracket, power supply  0515-0375 Machine screw, M3.0 x 16, pan head (To attach midplane board to midplane  bracket.) 0515-1946 Machine screw, M3.0 x 6, flat head (To attach power supply bracket to power ...
Page 264 Replaceable Parts Replaceable Parts Listings Figure 6-42 Top Hardware and Miscellaneous Parts, Top View, All Options 6-104 Keysight N5224A/25A Service Guide...
Page 265: Bottom Hardware And Miscellaneous Parts
Replaceable Parts Replaceable Parts Listings Bottom Hardware and Miscellaneous Parts Reference Part Number Description Designator 0515-1227 Machine screw, M3.0 x 6, flat head (To attach test set front sub panel.)  0515-2994 Machine screw, M3.0 x 0.5, pan head (8 to attach A42–A45 bias tees to their ...
Page 266 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Designator N5227-00001 Test set front plate, 2-port models without front panel jumpers N5224-00004 Test set front plate, 2-port models with front panel jumpers N5224-00005 Test set front plate, all 4-port models 5022-1087 Test port coupler dress nut (One for each coupler.) 0515-1521...
Page 267 Replaceable Parts Replaceable Parts Listings Figure 6-43 Bottom Hardware and Miscellaneous Parts Keysight N5224A/25A Service Guide 6-107...
Page 268: Internal Hardware And Miscellaneous Parts, All Options
Replaceable Parts Replaceable Parts Listings Internal Hardware and Miscellaneous Parts, All Options Reference Part Number Description Designator N5247-00016 Left side inner bracket  W1312-00048 Midplane bracket  N5247-00015 Right side inner bracket  N5224-00001 Chassis  0515-0372 Machine screw, M3.0 x 8, pan head (To attach: midplane bracket to left and ...
Page 269 Replaceable Parts Replaceable Parts Listings Figure 6-44 Internal Hardware and Miscellaneous Parts, All Options Keysight N5224A/25A Service Guide 6-109...
Page 270: External Hardware And Miscellaneous Parts, All Options
Replaceable Parts Replaceable Parts Listings External Hardware and Miscellaneous Parts, All Options Reference Part Number Description Designator N5245-00018 Outer cover  5041-9611 Rear foot  0515-1619 Machine screw M4.0 x 25, pan head (To attach rear foot.)  N5247-60003  Strap handle assembly (Includes item 0515-0710 Machine screw M5.0 x 18, flat head (To attach strap handles.)
Page 271 Replaceable Parts Replaceable Parts Listings Figure 6-45 External Hardware and Miscellaneous Parts, All Options Miscellaneous Part Numbers Table 6-3 Part Numbers for Miscellaneous Parts and Accessories Description Model or Part Number Service Tools 1/4 inch and 5/16 inch open-end wrench, thin profile 8710-0510 5/16 inch (8 mm), open-end wrench 8710-2174...
Page 272 Replaceable Parts Replaceable Parts Listings Table 6-3 Part Numbers for Miscellaneous Parts and Accessories (Continued) Description Model or Part Number Installation and Quick Start Guide (for all PNA series analyzers) (Cannot be ordered. Part number E8356-90001 is for reference only. Must be printed from the Keysight Web site.) Service Guide.
Page 273 Replaceable Parts Replaceable Parts Listings Table 6-3 Part Numbers for Miscellaneous Parts and Accessories (Continued) Description Model or Part Number Analyzer Accessories Pulse I/O Adapter (For connecting between the analyzer’s rear-panel PULSE I/O connector and N1966A the coaxial inputs and outputs of external pulse generators and external pulse modulators.) USB Accessories Mouse 0960-3248...
Page 274 Replaceable Parts Replaceable Parts Listings Table 6-3 Part Numbers for Miscellaneous Parts and Accessories (Continued) Description Model or Part Number Dove gray (for use on frame around front panel and painted portion of handles) 6010-1146 French gray (for use on cover) 6010-1147 Parchment white (for use on rack mount flanges, rack support flanges, and front 6010-1148...
Page 275: Repair And Replacement Procedures
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Repair and Replacement Procedures Before replacing the A23 board, if possible: Run EEBackup.exe using the directory for your Windows operating system: Windows 7 OS: C:/Program Files (x86)/Agilent/Network Analyzer/Service/EEBackup.exe. Click on Save EEPROM Backup, and then click on Backup TSMB Memory. Windows 10 OS (32-bit): C:/Program Files (x86)/Keysight/Network Analyzer/Service/EEBackup.exe.
Page 276: Information In This Chapter
Repair and Replacement Procedures Information in This Chapter Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Keysight Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content...
Page 277: Personal Safety Warnings
Repair and Replacement Procedures Personal Safety Warnings Personal Safety Warnings These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so. The opening of covers or removal of parts may expose dangerous voltages.
Page 278: Electrostatic Discharge (Esd) Protection
Repair and Replacement Procedures Electrostatic Discharge (ESD) Protection Electrostatic Discharge (ESD) Protection Many of the assemblies in this instrument are very susceptible to damage from electrostatic discharge (ESD). Perform the following procedures only at a static-safe workstation and wear a grounded wrist strap. This is important.
Page 279: Removal And Replacement Procedures
Repair and Replacement Procedures Removal and Replacement Procedures Removal and Replacement Procedures Table 7-1 List of Procedures Reference Assembly Description Location Designator Covers, outer and inner page 7-7 Fan bracket and fans page 7-60 Front panel assembly page 7-9 Front panel LED boards page 7-58 Front panel display board page 7-11...
Page 280 Repair and Replacement Procedures Removal and Replacement Procedures Table 7-1 List of Procedures (Continued) Reference Assembly Description Location Designator Port 1 source step attenuator page 7-49 Port 3 source step attenuator Port 4 source step attenuator Port 2 source step attenuator Port 1 bias tee page 7-52 Port 3 bias tee...
Page 281: Removing The Covers
Repair and Replacement Procedures Removing the Covers Removing the Covers Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) Removing the Outer Cover This procedure is best performed with the analyzer resting on its front handles in the vertical position.
Page 282 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5224A/25A Service Guide...
Page 283: Removing And Replacing The Front Panel Assembly
Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Removing and Replacing the Front Panel Assembly Tools Required 9 mm nutsetter or open end wrench torque wrench (torque to 21 in-lb or 2.38 N.m) — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) —...
Page 284 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal 7-10 Keysight N5224A/25A Service Guide...
Page 285: Removing And Replacing The A1-A3 And Other Front Panel Subassemblies
Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Tools Required — T-8 TORX driver (torque to 6 in-lb or 0.68 N.m) — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) —...
Page 286 Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Removing the Touchscreen Controller Board  1. Disconnect the touchscreen controller board cable (item ) from the touchscreen controller board and front panel interface board. 2. Disconnect the flat flex cable from the touchscreen. ...
Page 287 Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies 3. The touch screen can now be removed from the front panel assembly. Note the orientation of the touch screen in the front panel assembly for installation of the new touch screen.
Page 288 Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Figure 7-5 A3 Display Assembly and Touch Screen Removal-2 Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure.
Page 289: Removing And Replacing The A4-A17 Boards
Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards Removing and Replacing the A4–A17 Boards IMPORTANT! If you are replacing the A16 SPAM 4 board with a SPAM 5 board, a new operating system is recommended and some new cables are required.
Page 290 Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards  b. Remove two screws (item ), one at each end of the board, from the board to be removed (Exception: A14 does not have screws).  c. Lift the two extractors (item ), one at each end of the board, and lift the board.
Page 291 Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards Figure 7-6 A4, A5, A7, A8, A10, A12, A13, A14, A15, A16, and A17 Boards Removal Keysight N5224A/25A Service Guide 7-17...
Page 292: Removing And Replacing The A18 System Motherboard
Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard Removing and Replacing the A18 System Motherboard Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 293 Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard 13. Turn the analyzer over so that the bottom side is up and remove the A23 Test Set Motherboard and the A24 IF Mux. Disconnect the two ribbon cables from the A18 System Motherboard. ...
Page 294 Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard Figure 7-7 A18 System Motherboard Removal 7-20 Keysight N5224A/25A Service Guide...
Page 295: Removing And Replacing The A19 Midplane Board
Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Removing and Replacing the A19 Midplane Board Tools Required — T-10 TORX driver (torque to 9 in-lb) — T-20 TORX driver (torque to 21 in-lb) — 5/16 inch open-end torque wrench (torque to 10 in-lb) —...
Page 296 Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Figure 7-8 A19 Midplane Board Removal 7-22 Keysight N5224A/25A Service Guide...
Page 297: Removing And Replacing The A20 Power Supply Assembly
Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Removing and Replacing the A20 Power Supply Assembly Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 298 Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Figure 7-9 A20 Power Supply Assembly Removal 7-24 Keysight N5224A/25A Service Guide...
Page 299: Removing And Replacing The A21 Cpu Board Assembly
Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Removing and Replacing the A21 CPU Board Assembly Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 300 Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Figure 7-10 A21 CPU Board Assembly Removal 7-26 Keysight N5224A/25A Service Guide...
Page 301: Removing And Replacing The A22 Gpib Board
Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Removing and Replacing the A22 GPIB Board Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 302 Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Figure 7-11 A22 GPIB Board Removal 7-28 Keysight N5224A/25A Service Guide...
Page 303: Removing And Replacing The A23 Test Set Motherboard
Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard Removing and Replacing the A23 Test Set Motherboard Before replacing the A23 test set motherboard, if possible: Run EEBackup.exe using the directory for your Windows operating system: Windows 7 OS: C:/Program Files (x86)/Agilent/Network Analyzer/Service/EEBackup.exe.
Page 304 Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard 7. Slide the A23 test set motherboard toward the front of the instrument until the rear panel BNC connectors are free of the rear panel, then lift the motherboard and remove it from the analyzer.
Page 305 Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard Figure 7-12 A23 Test Set Motherboard Removal Keysight N5224A/25A Service Guide 7-31...
Page 306: Removing And Replacing The A24 If Multiplexer Board
Repair and Replacement Procedures Removing and Replacing the A24 IF Multiplexer Board Removing and Replacing the A24 IF Multiplexer Board Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 307 Repair and Replacement Procedures Removing and Replacing the A24 IF Multiplexer Board Figure 7-13 A24 IF Multiplexer Board Removal 1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-15 on page 7-36 and for details...
Page 308: Removing And Replacing The A25 Hma26.5
Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Removing and Replacing the A25 HMA26.5 Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 309 Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Figure 7-14 A25 HMA26.5 Removal 1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-15 on page 7-36 and for details...
Page 310: Verify The Model/Version Of Hma26.5 Installed
Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Verify the Model/Version of HMA26.5 Installed This upgrade kit contains components for use with PNA models using the legacy HMA26.5 part number 5087-7765. If your PNA has the newer HMA26.5 part number N5240-60101 installed you may discard these parts: —...
Page 311: Removing And Replacing The A26 Splitter
Repair and Replacement Procedures Removing and Replacing the A26 Splitter Removing and Replacing the A26 Splitter Tools Required — T-8 TORX driver (torque to 6 in-lb) — T-20 TORX driver (torque to 21 in-lb) — 5/16 inch open-end torque wrench (torque to 10 in-lb) —...
Page 312 Repair and Replacement Procedures Removing and Replacing the A26 Splitter Figure 7-16 A26 Splitter Removal 1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-15 on page 7-36 and for details...
Page 313: Removing And Replacing The A27 And A28 Mixer Bricks
Repair and Replacement Procedures Removing and Replacing the A27 and A28 Mixer Bricks Removing and Replacing the A27 and A28 Mixer Bricks Tools Required — T-8 TORX driver (torque to 6 in-lb) — T-10 TORX driver (torque to 9 in-lb) —...
Page 314 Repair and Replacement Procedures Removing and Replacing the A27 and A28 Mixer Bricks Disconnect these cables and remove the mixer brick mounting block, with the mixer brick(s), the mixer brick shields, and the A26 splitter attached, from the analyzer. 8. If replacing a mixer brick: ...
Page 315 Repair and Replacement Procedures Removing and Replacing the A27 and A28 Mixer Bricks Figure 7-17 A27 and A28 Mixer Bricks Removal 1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-15 on page 7-36 and for details...
Page 316: Brackets
Repair and Replacement Procedures Removing and Replacing the A29–A32 Receiver Couplers and Receiver Coupler Mounting Brackets Removing and Replacing the A29–A32 Receiver Couplers and Receiver Coupler Mounting Brackets Tools Required — T-6 TORX driver (torque to 4 in-lb or 0.45 N.m) —...
Page 317 Repair and Replacement Procedures Removing and Replacing the A29–A32 Receiver Couplers and Receiver Coupler Mounting Brackets Figure 7-18 A29 through A32 receiver couplers Removal Keysight N5224A/25A Service Guide 7-43...
Page 318: Removing And Replacing The A33-A36 Test Port Couplers
Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Removing and Replacing the A33–A36 Test Port Couplers Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 319 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Replacement Procedure 1. Reverse the order of the removal procedure.  Adhere a new gap pad (4-port) or coupler bumper (2-port) (item ) to the new coupler in the same location as on the old one. If necessary, replace ...
Page 320 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Figure 7-19 A33 through A36 Test Port Couplers Removal 7-46 Keysight N5224A/25A Service Guide...
Page 321: Removing And Replacing The A37 Reference Mixer Switch
Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Removing and Replacing the A37 Reference Mixer Switch Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 322 Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Figure 7-20 A37 Reference Mixer Switch Removal 7-48 Keysight N5224A/25A Service Guide...
Page 323: Attenuators
Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) —...
Page 324 Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Replacement Procedure 1. Reverse the order of the removal procedure. Torque all cable connections to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure.
Page 325 Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Figure 7-21 Source and Receiver Attenuators 1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-15 on page 7-36 and for details...
Page 326: Removing And Replacing The A42-A45 Bias Tees
Repair and Replacement Procedures Removing and Replacing the A42–A45 Bias Tees Removing and Replacing the A42–A45 Bias Tees Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 327 Repair and Replacement Procedures Removing and Replacing the A42–A45 Bias Tees Figure 7-22 A42 through A45 Bias Tees Removal Keysight N5224A/25A Service Guide 7-53...
Page 328: Removing And Replacing The A55 Solid State Drive (Ssd)
Repair and Replacement Procedures Removing and Replacing the A55 Solid State Drive (SSD) Removing and Replacing the A55 Solid State Drive (SSD) Certain unique files exist on the SSD that are necessary for proper operation of your analyzer. These files must be copied to another location to allow them to be installed onto the new SSD after it has been installed.
Page 329 Repair and Replacement Procedures Removing and Replacing the A55 Solid State Drive (SSD) Figure 7-23 SSD Removal Reinstalling the SSD Reverse the order of the removal procedure. Install Backup Files onto the New SSD The files that were previously saved onto a USB flash memory drive must now be installed onto the new SSD.
Page 330: Removing And Replacing The Rear Panel
Repair and Replacement Procedures Removing and Replacing the Rear Panel Removing and Replacing the Rear Panel Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 331 Repair and Replacement Procedures Removing and Replacing the Rear Panel Figure 7-24 Rear Panel Removal Keysight N5224A/25A Service Guide 7-57...
Page 332: Removing And Replacing The Front Panel Led Boards
Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards Removing and Replacing the Front Panel LED Boards Tools Required — T-10 TORX driver (torque to 9 in-lb) — T-20 TORX driver (torque to 21 in-lb) — 5/16 inch open-end torque wrench (torque to 10 in-lb) —...
Page 333 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards Figure 7-25 Front Panel LED Boards Removal Keysight N5224A/25A Service Guide 7-59...
Page 334: Removing And Replacing The Fans
Repair and Replacement Procedures Removing and Replacing the Fans Removing and Replacing the Fans Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) — Pozidriv screw driver —...
Page 335 Repair and Replacement Procedures Removing and Replacing the Fans Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-64.
Page 336: Removing And Replacing The Lithium Battery
Repair and Replacement Procedures Removing and Replacing the Lithium Battery Removing and Replacing the Lithium Battery Tools Required — T-10 TORX driver (torque to 9 in-lb or 1.02 N.m) — T-20 TORX driver (torque to 21 in-lb or 2.38 N.m) —...
Page 337 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-27 Lithium Battery Removal Keysight N5224A/25A Service Guide 7-63...
Page 338: Post-Repair Procedures
Repair and Replacement Procedures Post-Repair Procedures Post-Repair Procedures After the replacement of an assembly, you must perform the service procedures in the order listed in Table 7-2. Procedures referenced in this table are located in Chapter 3, “Tests and Adjustments,” unless specified otherwise.
Page 339 Repair and Replacement Procedures Post-Repair Procedures Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures A4 13.5 GHz source 1 synthesizer EE Default Adjustment: Synth Src1 Source Power Accuracy Test board only Source Maximum Power Output...
Page 340 Repair and Replacement Procedures Post-Repair Procedures Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures A16 SPAM board Source Adjustment Noise Floor Test IF Gain Adjustment Trace Noise Test Receiver Characterization Receiver Adjustment IF Response Adjustment (Option 090, 093, or 094 Only)
Page 341 Repair and Replacement Procedures Post-Repair Procedures Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures A25 HMA26.5 EE Default Adjustment: LO Drive Noise Floor Test only Receiver Compression Test Source Adjustment Dynamic Accuracy Test IF Gain Adjustment Receiver Characterization...
Page 342: Resetting The Mechanical Counter
Repair and Replacement Procedures Post-Repair Procedures Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures A42–A45 bias tees Source Adjustment Source Maximum Power Output IF Gain Adjustment Test Receiver Characterization Calibration Coefficients Test Receiver Adjustment IF Response Adjustment (Option...
Page 343: Eeprom Backup
Repair and Replacement Procedures Post-Repair Procedures Figure 7-28 Mechanical Cycle Counter window (Port 1 NOISE TUNER SWITCH and Port 2 NOISE RECVR SWITCH are only applicable for Option 029) EEPROM Backup The analyzer uses arrays of correction constants to enable the analyzer to produce accurate, leveled source signals and receive clean test signals.
Page 344 Repair and Replacement Procedures Post-Repair Procedures — Windows 10 -- C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program. — Click Backup EEPROM. — Click Backup TSMB Mem. — Click Backup Synth Mem. (Applies to Version 7 Synthesizers Only) — Click Exit when the program has finished. Figure 8 EEPROM Backup Menu 7-70...
Page 345: General Purpose Maintenance Procedures
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide General Purpose Maintenance Procedures Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Error Terms How to use error terms as a preventive maintenance and page 8-2 troubleshooting tool.
Page 346: Error Terms
General Purpose Maintenance Procedures Error Terms Error Terms Using Error Terms as a Diagnostic Tool By examining error terms, you can monitor system performance for preventive maintenance and troubleshooting purposes. The the most common causes of error term anomalies are: —...
Page 347: Performing Measurement Calibration
General Purpose Maintenance Procedures Error Terms To find assemblies related to error term failures, refer to error term descriptions “Error Term Data” on page 8-8. Each description lists common assemblies related to each error term. Identify the assembly and refer to Chapter 4, “Troubleshooting.”...
Page 348 General Purpose Maintenance Procedures Error Terms S = Source Match R = Reflection Tracking The error terms are the same for a one port measurement on Port 2 (S Figure 8-2 Flowgraph of Two-Port Error Terms where: E = error term 1st Subscript: D = Directivity S = Source Match...
Page 349 General Purpose Maintenance Procedures Error Terms Figure 8-3 Flowgraph of Three-Port Error Terms where: E = error term DIR = Directivity MAT = Forward Source Match and Reverse Load Match TRK = Forward Reflection Tracking and Reverse Transmission Tracking For the case of a full 3-port calibration, port 1 has three Match error terms: S11 source match S12 load match...
Page 350: Accessing Error Terms
General Purpose Maintenance Procedures Error Terms Figure 8-4 Flowgraph of Four-Port Error Terms where: E = error term DIR = Directivity MAT = Forward Source Match and Reverse Load Match TRK = Forward Reflection Tracking and Reverse Transmission Tracking For the case of a full 4-port calibration, port 1 has four Match error terms: S11 source match S12 load match...
Page 351 General Purpose Maintenance Procedures Error Terms — “Front Panel Access to Error Terms” on page 8-7 Programmatically — “GPIB Access to Error Terms” on page 8-7 — “COM/DCOM Access to Error Terms” on page 8-7 Manual Access to Error Terms Front Panel Access to Error Terms Ensure that calibration correction is active by pressing RESPONSE and verifying that the softkey label reads Correction ON/off.
Page 352: Error Term Data
General Purpose Maintenance Procedures Error Terms Error Term Data The error term descriptions in this section include the following information: — a table of the error terms — description and significance of each error term — measurements affected by each error term —...
Page 353 General Purpose Maintenance Procedures Error Terms Directivity (E and E and E are the uncorrected forward and reverse directivity error terms of the system. The directivity error of the test port is determined by measuring the and S reflection of the calibration kit load. The load has a much better return loss specification than does the uncorrected test port.
Page 354 General Purpose Maintenance Procedures Error Terms The measurements most affected by load match errors are all transmission measurements, and reflection measurements of a low insertion loss two-port device, such as an airline. Typical Cause of Failure The calibration kit load or a bad “thru” cable is the most common cause of load match specification failure.
Page 355: Option Enable Utility
General Purpose Maintenance Procedures Option Enable Utility Option Enable Utility Accessing the Option Enable Utility To start the option enable utility: Service Option Enable — Press UTILITY , then , then System — A dialog box similar to the one illustrated in Figure 8-5 is displayed.
Page 356: Enabling Or Removing Options
General Purpose Maintenance Procedures Option Enable Utility Identifying Your Instrument’s Host ID From the online Keysight HostID utility: — Part of the OEC procedure to obtain the 12-digit license key online requires you to provide the HostID number of the PNA. This HostID number is NOT the one currently shown on the PNA.
Page 357: Repairing And Recovering Option Data
General Purpose Maintenance Procedures Option Enable Utility 020 - Add IF inputs 021 - Pulse Modulator on Source 1 022 - Pulse Modulator on Source 2 025 - 4-Receiver Pulse Generator 086 - Gain Compression Application 087- IMD Measurements 219 - Src/Rcvr Atten & Bias Tees 2-Port 419 - Src/Rcvr Atten &...
Page 358: Installing Or Changing A Serial Number
General Purpose Maintenance Procedures Option Enable Utility — If the solid state drive is replaced, a new gen.lic file is automatically created when the Network Analyzer application starts, by retrieving the data from the EEPROM. Recovery of Data if Option or Model Numbers are Incorrect If the analyzer option or model numbers are not listed correctly on the analyzer display, in either the Option Enable Dialog Box or the About Network Analyzer display, you should regenerate the options license file, gen.lic:...
Page 359 General Purpose Maintenance Procedures Option Enable Utility To change an incorrect serial number, a clear-code password is required. Contact Keysight to obtain the clear-code. Refer to “Contacting Keysight” on page 2-7. Keysight N5224A/25A Service Guide 8-15...
Page 360: Firmware Upgrades
General Purpose Maintenance Procedures Firmware Upgrades Firmware Upgrades How to Check the Current Firmware Version 1. Press UTILITY , then , then System Help About NA... A dialog box showing the current installed Application Code Version is displayed. 2. To determine if a firmware update is available, proceed to “Downloading from the Internet.”...
Page 361: Operating System Recovery
General Purpose Maintenance Procedures Operating System Recovery Operating System Recovery Recovering from Solid State Drive Problems If you suspect that you have a solid state drive problem, go to the “Hard Drive Recovery” link on the Keysight PNA Series: Service & Support Home Page on the Internet.
Page 362: Correction Constants
General Purpose Maintenance Procedures Correction Constants Correction Constants The analyzer stores many correction constants in non-volatile EEPROM memory. These constants enable the analyzer to produce accurate, leveled source signals and receive clean test signals. Storing Correction Constants After performing any adjustment listed on page 3-41 in this manual, store the correction constants to a backup file on the analyzer solid state drive by...
Page 363: A:.eeprom Address Assignments And Location
Keysight Technologies - Appendix N52xxA/B Microwave Network Analyzers Service Guide EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 EEPROM Address Assignments and Location Physical Location Board Rev Letter Cal Body Contents Addr E080 A16 SPAM...
Page 364 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 (Continued)EEPROM Address Assignments and Location (Continued) Physical Location Board Rev Letter Cal Body Contents Addr A4 LO Synth rev 4 (N5230-60002) Synth Power Cal E580 A4 LO Synth...
Page 365 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 (Continued)EEPROM Address Assignments and Location (Continued) Physical Location Board Rev Letter Cal Body Contents Addr A12 50 GHz Doubler (5087–7318 assembly, 5067–1335 bias board) EB00 Unused A12 50 GHz Doubler...
Page 366 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Appendix–4 Service Guide...
Page 367 Index Numerics troubleshooting troubleshooting 4-28 4-34 typical power output A16 SPAM board 4-40 13.5 GHz LO synthesizer board A trace illustrated 6-18 operation 5-11 troubleshooting operation , 4-28, 4-31 part number 6-16 A1 front panel interface board analog 5-24 removal and replacement part number digital 6-12...
Page 368 Index procedure part number A31 test port 4 receiver coupler 7-23 , 6-56, 6-63, 6-70, illustrated troubleshooting 6-77, 6-87 , 6-57, 6-64, 6-71, removal and replacement A21 CPU board 6-78, 6-89 illustrated part number illustrated 7-38 , 6-56, 6-63, 6-70, 6-18 operation procedure...
Page 369 Index illustrated procedure part number , 6-24, 6-30, 6-37, 7-49 , 6-77, 6-87 removal and replacement troubleshooting 6-43, 6-50, 6-57, 6-64, 6-71, 4-42 illustrated A41 test port 2 source step 6-78, 6-89 7-51 operation attenuator procedure 5-19 7-49 part number illustrated , 6-23, 6-29, 6-36, troubleshooting...
Page 370 Index analyzer frequency reference board attenuators in operator’s check assembly 3-12 5-14 in test port cable checks front panel 3-14 reference mixer interconnects 5-30 switch 5-23 part numbers functional groups 6-113 signal separation digital control accuracy group 5-18 dynamic accuracy test digital processing 3-39 source boards...
Page 371 Index troubleshooting illustrated bottom assembly, Option 410 4-28 6-39 typical power output replaceable parts part numbers 4-40 6-38 B trace illustrated replaceable ribbon cables & 6-71 troubleshooting part numbers 4-28 wire harnesses 6-70 B1 fan illustrated replaceable RF cables 6-41 removal and replacement illustrated part numbers...
Page 372 Index connector repeatability correction 3-12 8-18 contacting Keysight failure description of 3-20 3-12 controllers insertion loss dialog box 3-13 troubleshooting with 4-20 failure failure of 3-17 3-14 correction constants 8-18 magnitude and phase performing 3-12 coupler stability preliminary 3-12 test port 1 system failure 3-19...
Page 373 Index group electrostatic discharge EXT 10 MHz REF OUT connector power supply group See ESD electrostatic discharge, See rear panel receiver group , 5-13, 5-14 external signal separation enabling analyzer group options replaceable 8-12 synthesized source entitlement certificate, parts , 6-110, group option 8-11...
Page 374 Index part number LED board, removal and CONTROLLER 6-10 front panel replacement software 4-19 assembly illustrated systems check 7-59 4-19 replaceable parts procedure , 6-10, port 7-58 lower dress panel rear panel 6-11, 6-12 5-32 assembly, removal and illustrated rear panel 6-11 replacement...
Page 375 Index HANDLER I/O test procedure 4-15 7-62 pin assignments troubleshooting LO synthesizer board 5-16 4-14 Keysight PULSE I/O See A15 contacting pin assignments load match 5-25 support cause of failure PWR I/O 8-10 kits definition of pin assignments 5-17 calibration measurements affected , 2-5, rear panel...
Page 376 Index front panel Option 219, bottom assembly 5-30 See A27 and A28 model numbers front panel display See bottom assembly, upgrade kits board 6-113 5-30 Option 219 module hard disk drive Option 400, bottom assembly 5-32 exchange HMA 26.5 5-13 See bottom assembly, procedure HMA26.5...
Page 377 Index compression power switch 5-32 board interconnects , 5-13, 5-14, 5-25, parts list software, internal 6-12 5-32 3-31 removal removal and replacement source maximum power 7-12 illustrated overlay 7-57 output 3-32 part number procedure , 6-10, 6-11 7-56 source power power up replaceable parts accuracy...
Page 378 Index part numbers 5-27 6-99 See cables, RF operation ribbon serial number 5-23 changing troubleshooting 8-14 4-42 See cables, rib- installing group, defined 8-14 4-30 service linearity wire harnesses battery dynamic accuracy See cables, wire part numbers 6-112 test 3-39 harnesses contacting Keysight outputs...
Page 379 Index troubleshooting substitution what it verifies 4-32 3-21 cable match system, motherboard 3-24 calibration kits cause of failure 3-25 See A18 verification kits definition of 3-25 supplies measurements affected battery test part number 6-112 maximum output power adjustments 3-41 test 3-32 calibration coefficients part numbers...
Page 380 Index coupler failure A20 power supply 3-17 troubleshooting assembly TEST SET I/O 4-41 A21 CPU board dynamic accuracy test connector 4-19 3-39 A24 IF multiplexer board maximum output power pin assignments 4-45 5-15 A25 HMA26.5 test rear panel 4-34 3-32 5-14 A26 splitter noise floor test...
Page 381 Index fans Port 4 of operating 4-11 4-40 front panel specifications using controllers to system 4-14 front panel keypad system troubleshoot 4-14 , 3-1, 3-8, 3-21 4-20 front panel knob dialog box using error terms 4-14 3-25 front-panel USB where to begin example of results 4-14 , 3-28,...
Page 382 Index Keysight N5224A/25A Service Guide...
Page 383 Installation Note Xxxxx-xxxxx...
Page 384 This information is subject to change without notice. © Keysight Technologies 2011-2023 Edition 1, March 2023 N5225-90001 www.keysight.com...

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