Page 1 2-Port and 4-Port PNA-L - Microwave Network Analyzers - Service Guide N5231A (10 kHz to 13.5 GHz) N5232A (10 kHz to 26.5 GHz) N5239A (10 kHz to 8.5 GHz) This is the Service Guide for the N5231/2/9A Series Microwave Network Analyzers.
Page 2 COVERING THE MATERIAL IN THIS DOCUMENT THAT CONFLICT WITH government requirements THESE TERMS, THE WARRANTY beyond those set forth in the © Keysight Technologies, Inc. TERMS IN THE SEPARATE EULA shall apply, except to the 2011-2023 AGREEMENT WILL CONTROL. extent that those terms, rights, or...
Page 5 Performance Tests ............3-8 Keysight N5231A/32A/39A Service Guide...
Page 6 Check the Basics ............4-6 Keysight N5231A/32A/39A Service Guide...
Page 7 A29–A30 60 dB Step Attenuators ......... 5-19 Keysight N5231A/32A/39A Service Guide...
Page 8 Bottom Assemblies, N5231A and N5232A, Option 400 ......6-32 Bottom Cables, N5231A and N5232A, Option 400 ......6-34 Bottom Ribbon Cables, N5231A and N5232A, Option 400 .
Page 9 Accessing the Option Enable Utility........8-12 Keysight N5231A/32A/39A Service Guide...
Page 10 Storing Correction Constants ..........8-18 Keysight N5231A/32A/39A Service Guide...
Page 11 Contents Keysight N5231A/32A/39A Service Guide...
Page 12 Contents Keysight N5231A/32A/39A Service Guide...
Page 13 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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 14 Warning denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning note until the indicated conditions are fully understood and met. Keysight N5231A/32A/39A Service Guide...
Page 15 If unstable power levels are expected, the analyzer input power must be buffered by a line conditioner. This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 61010-1:2001 and 664 respectively. Keysight N5231A/32A/39A Service Guide...
Page 16 The measuring terminals on this instrument are designed to be used with external signals described in Measurement Category I, but NOT with external signals described in Categories II, III, and IV. The input of this instrument cannot be connected to the mains. Keysight N5231A/32A/39A Service Guide...
Page 17 There are no replaceable fuses in the mains input or within the power supply assembly. Keysight personnel: after calibration is completed, attach four “calibration void if seal broken” stickers to the PNA as shown in Figure 1-1. Keysight N5231A/32A/39A Service Guide...
Page 18 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5231A/32A/39A Service Guide...
Page 19 3. Connect the other end of the cable to the test port and remove the short from the cable. Figure 1-2 shows a typical ESD protection setup using a grounded mat and wrist strap. Refer to “ESD Supplies” on page 6-53 for part numbers. Keysight N5231A/32A/39A Service Guide...
Page 20 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5231A/32A/39A Service Guide...
Page 21 This symbol indicate the presence of a Laser device. This symbol indicates the surface can be hot. This symbol indicated the product is sensitive to electrostatic discharge. Keysight N5231A/32A/39A Service Guide...
Page 22 This is a space saver label that combines two markings - CAN ICES and ISM. This is a symbol of an Industrial Scientific and Medical Group 1 Class A product (CISPR 11, Clause 5). South Korean Certification (KC) mark. It includes the marking’s identifier code. 1-10 Keysight N5231A/32A/39A Service Guide...
Page 23 If the battery on the A17 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 24 Safety and Regulatory Information Regulatory Information 1-12 Keysight N5231A/32A/39A Service Guide...
Page 25 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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.
Page 26 To see a list of the options, accessories, and upgrades available for the network analyzers, 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. Only Keysight approved accessories shall be used. Keysight N5231A/32A/39A Service Guide...
Page 27 The recommended model or part number for all equipment listed with a “P” in the Use column is required for proper operation of this test software. d. If an accurate measurement of the dynamic accuracy specification is not required, the E4418A or E4419A can be used. Keysight N5231A/32A/39A Service Guide...
Page 28 T-10 TORX driver 0.5, 0.8, and 1.0 N-m T, R (4, 7, and 9 in-lb) settings T-15 TORX driver 1.5 N-m (14 in-lb) setting T, R T-20 TORX driver 2.4 N-m (21 in-lb) setting T, R Keysight N5231A/32A/39A Service Guide...
Page 29 USB flash ROM drive None P, A, R a. Unless specified otherwise, equipment listed is required for all analyzer models. b. P = Performance tests, A = Adjustments, T = Troubleshooting, R = Repair, V = System verification Keysight N5231A/32A/39A Service Guide...
Page 30 — “Shipping Your Analyzer to Keysight for Service or Repair” Service and Support Options The analyzer’s standard warranty is a one-year return to Keysight Technologies service warranty. There are many other repair and calibration options available from the Keysight Technologies support organization. These options cover a range of service agreements with varying response times.
Page 31 Keysight for repair. If you wish to send your network analyzer to Keysight Technologies for service or repair: — Include a complete description of the service requested or of the failure and a description of any failed test and any error message.
Page 32 General Product Information Keysight Support, Services, and Assistance Keysight N5231A/32A/39A Service Guide...
Page 33 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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 34 Source Maximum Power Output Test Source Power Linearity Test — Frequency Accuracy Test — — Trace Noise Test — Receiver Compression Test — Noise Floor Test — Calibration Coefficients Test — Dynamic Accuracy Test — Noise State Calibration Coefficients Keysight N5231A/32A/39A Service Guide...
Page 35 IF Response Adjustment (Option 090, 093, or 094 Only) a. These performance tests are included in the analyzer’s firmware for Options 897 and 898. b. These adjustments are included in the analyzer’s firmware on all models and options. Keysight N5231A/32A/39A Service Guide...
Page 36 To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-7, for all of the procedures in this chapter. Keysight N5231A/32A/39A Service Guide...
Page 37 — Use isopropyl alcohol — Clean connector threads Gaging Connectors — Clean and zero the gage before use Do Not — Use an out-of-specification connector — Use the correct gage type — Use correct end of calibration block Keysight N5231A/32A/39A Service Guide...
Page 38 Cleaning connectors with alcohol shall only be done with the instrument’s power cord removed, and in a well-ventilated area. Allow all residual alcohol moisture to evaporate, and the fumes to dissipate prior to energizing the instrument. Keysight N5231A/32A/39A Service Guide...
Page 39 — Complete all of the performance tests using a certified calibration kit that will be used for future measurements. This alternative verifies both the system specifications and the instrument specifications for the analyzer. Keysight N5231A/32A/39A Service Guide...
Page 40 An illustrated outline of the performance verification procedure: — for ANSI/NCSL Z540.3-2006 and ISO/IEC 17025 verification, is shown in Figure 3-1 on page 3-10. — for non-standards verification, is shown in Figure 3-2 on page 3-11. Keysight N5231A/32A/39A Service Guide...
Page 41 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 42 After the failure has been corrected, repeat the entire set of performance tests and generate a new set of data. Figure 3-1 ANSI/NCSL Z540.3–2006 and ISO/IEC 17025 Verification Flowchart 1. Stop only in case of a catastrophic failure or cable connector damage 3-10 Keysight N5231A/32A/39A Service Guide...
Page 43 Troubleshoot and repair the first problem encountered without continuing to other tests. After you troubleshoot, repair, and adjust, repeat the last failed portion and generate a new set of data. Figure 3-2 Non–Standards Compliant Verification Flowchart Keysight N5231A/32A/39A Service Guide 3-11...
Page 44 Shorts/Opens are attached to ALL ports, to run through the test without stopping. Shorts and opens can be mixed on the test ports. 3. Click Begin. 3-12 Keysight N5231A/32A/39A Service Guide...
Page 45 3-3). The PNA Operator’s Check dialog box will look different for different PNA model numbers and installed options. Some of the tests are performed only if the appropriate options are installed in the PNA. Figure 3-3 Operator’s Check Dialog Box Keysight N5231A/32A/39A Service Guide 3-13...
Page 46 7. The marker annotation on the screen indicates the worst case return loss. Refer to the cable manual to see if it meets the return loss specification. For an example of a typical return loss measurement, see Figure 3-4. 3-14 Keysight N5231A/32A/39A Service Guide...
Page 47 CalSet_1.cst. 6. Connect the test port cable to the PNA Port 1 and perform a 1-port calibration again at the end of the cable. After calibration, save the cal set data as CalSet_2.cst. Keysight N5231A/32A/39A Service Guide 3-15...
Page 48 Help section “Save and Recall a File” if necessary. 10.Refer to the cable manual to see if it meets the insertion loss specification. For an example of a typical insertion loss measurement, see Figure 3-6. 3-16 Keysight N5231A/32A/39A Service Guide...
Page 49 Average on/OFF softkey to toggle it ON. The Averaging Factor box will appear directly above the display. In the Averaging Factor box, type 50 or click the arrows to select 50, and then press ENTRY Enter Keysight N5231A/32A/39A Service Guide 3-17...
Page 50 Therefore, the measured deflection value must be divided in half to reach the correct value. Figure 3-7 Typical Cable Magnitude and Phase Stability Response 3-18 Keysight N5231A/32A/39A Service Guide...
Page 51 7. Disconnect and then reconnect the cable to the test port. Tighten the connection to the specified torque for the connector type. 8. Press RESPONSE , then Averaging Restart 9. Look at the trace for spikes or modes. Keysight N5231A/32A/39A Service Guide 3-19...
Page 52 Typical Cable Connector Repeatability Response If the Cable Connector Repeatability 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. 3-20 Keysight N5231A/32A/39A Service Guide...
Page 53 Measurement Uncertainty Measurement uncertainty is defined as the sum of: — the residual systematic (repeatable) errors, and — the random (non-repeatable) errors in the measurement system after calibration. The systematic errors are: Keysight N5231A/32A/39A Service Guide 3-21...
Page 54 National Institute of Standards and Technology (NIST) (see Figure 3-9). This chain of measurements defines how the verification process brings traceability to the network analyzer system. 3-22 Keysight N5231A/32A/39A Service Guide...
Page 55 If you select to perform a calibration, you are guided through the calibration procedure. This part of the process can be eliminated if you Keysight N5231A/32A/39A Service Guide 3-23...
Page 56 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. 3-24 Keysight N5231A/32A/39A Service Guide...
Page 57 5. Under Printer Output, click one of the following options. Refer to Figure 3-10. — 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. Keysight N5231A/32A/39A Service Guide 3-25...
Page 58 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. 3-26 Keysight N5231A/32A/39A Service Guide...
Page 59 At the top of the printed output is the name of the device, the serial number of the device, and the date tested. Each S-parameter measurement result is printed with frequency tested, lower and upper limit lines, the measured data, and the result of the test. Keysight N5231A/32A/39A Service Guide 3-27...
Page 60 Tests and Adjustments System Verification Figure 3-12 Example of Printed Tabular Verification Results 3-28 Keysight N5231A/32A/39A Service Guide...
Page 61 — Data measured at the factory from the verification kit. Labeled as B in Figure 3-13. — Upper and lower limit points as defined by the total system uncertainty system. Labeled as C in Figure 3-13. Keysight N5231A/32A/39A Service Guide 3-29...
Page 62 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5231A/32A/39A Service Guide...
Page 63 2. The analyzer is set up for a CW reflection measurement on the test port to be measured. 3. A power sensor is connected to the test port, using any necessary adapters. 4. The analyzer frequency is set to the desired value. Keysight N5231A/32A/39A Service Guide 3-31...
Page 64 7. The power level at this point is measured and compared to the maximum output power specification. 8. This process is repeated at hundreds of frequencies across the analyzer’s full range in every specified path configuration. 3-32 Keysight N5231A/32A/39A Service Guide...
Page 65 “Source Adjustment” on page 3-42 and repeat this test. — If the analyzer still fails this test, troubleshoot the source section of the analyzer and then repeat this test. Refer to “Checking the Source Group” on page 4-34. Keysight N5231A/32A/39A Service Guide 3-33...
Page 66 Function of the Test: To measure the stability of a signal in the internal source and receiver system of your analyzer. Specification Tested: Test Port Input–Trace Noise Magnitude and Trace Noise Phase Equipment Used: A test cable. 3-34 Keysight N5231A/32A/39A Service Guide...
Page 67 Function of the Test: To measure the compression at the analyzer’s specified maximum power level for the receivers. Specification Tested: Test Port Input–Maximum Test Port Input Level Equipment Used: — U3070AK01 or Z5623A Option K01 Compression Test Set — Power meter — Power sensors Keysight N5231A/32A/39A Service Guide 3-35...
Page 68 13.The magnitude and phase measurements using the receiver under test are read: (Pd). 14.The compression for each point is calculated as (Pa–Pb) – (Pd–Pc). If the Analyzer Fails this Test: — Run the Receiver Characterization adjustment, and repeat this test. 3-36 Keysight N5231A/32A/39A Service Guide...
Page 69 8. The test cable is removed and loads are connected to both ports. 9. A CW linear measurement sweep is measured for each test point. The receiver test power level, Ptest, in dBm is calculated for each point from the mean of each sweep. Keysight N5231A/32A/39A Service Guide 3-37...
Page 70 6. This process is repeated for Ports 3 and 4 on 4-port analyzers. If the Analyzer Fails this Test: — Failure of the directivity error term is often due to a faulty test port coupler. Replace the coupler and repeat this test. 3-38 Keysight N5231A/32A/39A Service Guide...
Page 71 Replacement Procedures.” for instructions on replacing the suspected faulty component or assembly. Dynamic Accuracy Test This description applies to all N522xA, N5231A/32A/34A/35A/39A, and N5247A instruments. Function of the Test: To measure the relative power linearity of the analyzer’s receivers.
Page 72 “Removing and Replacing the A4, A7, A9, and A10 Boards” on page 7-16. Noise State Calibration Coefficients IMPORTANT! For the most current information on the Table 7-2 “Verification, Performance, and Other Tests and Procedures” column’s content, refer to https://cal.software.keysight.com/PNA/Help/N7840AWebHelp.htm. 3-40 Keysight N5231A/32A/39A Service Guide...
Page 73 Any that will measure a signal at 10 MHz. Procedure This adjustment typically adjusts to within ±0.01 ppm. 1. Connect the equipment as shown in Figure 3-14. Connect a GPIB cable between the network analyzer and the frequency counter. Keysight N5231A/32A/39A Service Guide 3-41...
Page 74 Equipment Used for the Source Adjustment Equipment Type Model or Alternate Model or Part Number Part Number Power meter E4418B/E4419B E4418A/E4419A Power sensor, 3.5 mm E4413A 8485A Adapter, 3.5 mm (f) to 3.5 mm (f) 83059B 85052-60012 3-42 Keysight N5231A/32A/39A Service Guide...
Page 75 1. A power meter/sensor is connected to Port 1, as shown in Figure 3-16, to establish a reference for flatness. 2. A cable is inserted between the power sensor and the test port, as shown Figure 3-17, to establish a reference for the cable. Keysight N5231A/32A/39A Service Guide 3-43...
Page 76 83059B 85052-60012 RF Cable, 3.5 mm (f) to 3.5 mm (f) 85131C 85131E Procedure 1. Connect the equipment as shown in Figure 3-16. Connect a GPIB cable between the network analyzer and the power meter. 3-44 Keysight N5231A/32A/39A Service Guide...
Page 77 , 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 N5231A/32A/39A Service Guide 3-45...
Page 78 Procedure Service Adjustments 1. Press UTILITY , then , then , then click IF System Response Adjustment. 2. Follow the instructions and prompts as they are displayed. 3-46 Keysight N5231A/32A/39A Service Guide...
Page 79 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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 80 This represents a “hardkey”, a key that is physically located on the instrument. Hardkey This represents a “softkey”, a key whose label is determined by the instrument Softkey firmware. Menu Item This represents an item in a drop-down or pop-up menu. Keysight N5231A/32A/39A Service Guide...
Page 81 Step 2. Replace the faulty assembly and determine what adjustments are necessary. Refer to Chapter 7, “Repair and Replacement Procedures.” Step 3. Perform the necessary adjustments. Refer to Chapter 3, “Tests and Adjustments.” Step 4. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Keysight N5231A/32A/39A Service Guide...
Page 82 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 83 Troubleshooting Getting Started with Troubleshooting Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” Go to “Front Panel Troubleshooting” Go to “Rear Panel Troubleshooting” Go to “Measurement System Troubleshooting” Keysight N5231A/32A/39A Service Guide...
Page 84 — If the line switch glows green and the fans are operating (audible), but the display remains dark, go to “Troubleshooting LCD Display Problems” on page 4-13. — If the instrument appears to abort the network analyzer measurement interface process, contact Keysight. Refer to “Contacting Keysight” on page 2-6. Keysight N5231A/32A/39A Service Guide...
Page 85 ACOM as ground reference for analog supplies and the point marked DCOM as ground reference for digital supplies. Refer to Figure 4-2 for the power supply measurement points on the A15 midplane board. Refer to Table 4-1 on page 4-9 for the correct voltages. Keysight N5231A/32A/39A Service Guide...
Page 86 Failure to do so can result in personal injury or loss of life. 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. Keysight N5231A/32A/39A Service Guide...
Page 87 If the missing supply voltages return to a “power on” condition after removal of an assembly, suspect that assembly as being defective. Remove the network analyzer assemblies in the order specified in the following steps (refer to Chapter 7 for removal instructions). Keysight N5231A/32A/39A Service Guide...
Page 88 You should be able to determine if the shorted condition has changed. Isolate the remaining three assemblies: — remove the A17 CPU board — remove the A16 power supply 4-10 Keysight N5231A/32A/39A Service Guide...
Page 89 A14 system motherboard. THIS MUST BE DONE QUICKLY AS THE ANALYZER WILL RAPIDLY OVERHEAT WITHOUT THE COOLING EFFECT OF THE FANS. DO NOT PLUG IN THE POWER CORD UNTIL READY TO PERFORM MEASUREMENTS. Keysight N5231A/32A/39A Service Guide 4-11...
Page 90 Troubleshooting Power Up Troubleshooting Figure 4-3 Fan Power Cable Connections (Right Side of Analyzer) Figure 4-4 Fan Power Cable Connections (Left Side of Analyzer) 4-12 Keysight N5231A/32A/39A Service Guide...
Page 91 4. If the front panel interface ribbon cable is properly connected, suspect that one or more of the following is defective: — inverter board (mounted on the display assembly) — A1 front panel interface board — A3 display assembly Keysight N5231A/32A/39A Service Guide 4-13...
Page 92 Service More Front Panel Test Press UTILITY , then , then , then System A Front Panel Key Test Utility dialog box will be displayed, as shown in Figure 4-5. 4-14 Keysight N5231A/32A/39A Service Guide...
Page 93 Subassemblies” on page 7-12. Table 4-2 Front Panel Keyboard Key Names TRACE/CHAN RESPONSE ENTRY ENTRY Keys Keys Keys Keys (Cont’d) Trace 1 Meas Trace 2 Format Cancel Enter Trace 3 Scale Help . (decimal point) Keysight N5231A/32A/39A Service Guide 4-15...
Page 94 3. If the movement of numbers is not smooth or no numbers appear at all, suspect a faulty A1 front panel interface board. To replace the A1 front panel interface board, refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-12. 4-16 Keysight N5231A/32A/39A Service Guide...
Page 95 USB port. — Wait 15 seconds for the analyzer to verify the device connection, and then check the operation of the USB device. — If the device performs correctly, the USB board is functioning properly. Keysight N5231A/32A/39A Service Guide 4-17...
Page 96 Checking the Operation of the Key Pad Commands To verify the key pad functionality, refer to “Front Panel Keypad and RPG Test” on page 4-14. Checking the Display To verify the display functionality, refer to “A3 Display Test” on page 4-17. 4-18 Keysight N5231A/32A/39A Service Guide...
Page 97 , then Configure , then SICL/GPIB... SICL/GPIB/SCPI dialog box is displayed. 3. In the GPIB block, click System Controller to establish the analyzer as a controller. Wait for the analyzer to configure, and then click OK. Keysight N5231A/32A/39A Service Guide 4-19...
Page 98 Problems with the Local Area Network (LAN) can be difficult to solve. Software and protocol problems can make it difficult to determine whether the analyzer's hardware is working properly, or if there is a problem with the LAN or cabling. 4-20 Keysight N5231A/32A/39A Service Guide...
Page 99 Windows Taskbar menu at the bottom of the display. b. On the Windows Taskbar menu, click Start, point to Programs, Accessories, and then click Command Prompt. c. The command prompt window is displayed. Keysight N5231A/32A/39A Service Guide 4-21...
Page 100 Other software may behave somewhat differently, but basically the same. 1. The letters x represent the IP address of the other device on the network. 2. The letters x represent the IP address of the analyzer. 4-22 Keysight N5231A/32A/39A Service Guide...
Page 101 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. Keysight N5231A/32A/39A Service Guide 4-23...
Page 102 2 on the other end of the cable. 3. Insulate all exposed wires so that they cannot short together. 4. Label this as a crossover cable so that it cannot be confused with a standard cable. 4-24 Keysight N5231A/32A/39A Service Guide...
Page 103 Troubleshooting Rear Panel Troubleshooting Figure 4-6 Construction of a Crossover Cable Keysight N5231A/32A/39A Service Guide 4-25...
Page 104 , then Help . Verify that the information displayed in this screen is correct for About NA... your analyzer. If any of the information is incorrect, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-6. 4-26 Keysight N5231A/32A/39A Service Guide...
Page 105 Error Messages SOURCE UNLEVELED: The source ALC circuit on the A19 test set motherboard is running open-loop. Check the cable connections for the A21 MASSY (2-port) or A20 MASSQuad (4-port) and the A19 test set motherboard. Keysight N5231A/32A/39A Service Guide 4-27...
Page 106 — For 4-port analyzer models, traces A, B, C, D, and R are displayed in five separate data windows as shown in Figure 4-9. Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly. 4-28 Keysight N5231A/32A/39A Service Guide...
Page 107 — If any of the traces are not present, are noisy or distorted, or are at an incorrect level, then there is a problem with the analyzer’s measurement system. Proceed to “Where to Begin Troubleshooting.” Keysight N5231A/32A/39A Service Guide 4-29...
Page 108 Address box, click the down arrow and then click My Computer. In an open area of the My Computer window, click the right mouse button and then click Properties in the resulting pop-up menu. 4-30 Keysight N5231A/32A/39A Service Guide...
Page 109 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 110 Check the output power of the A, B, C, and D signals: Equipment Used for This Check Equipment Type Model or Alternate Model or Part Number Part Number Power meter E4418B/E4419B E4418A/E4419A Power sensor, 3.5 mm N8485A 8485A 4-32 Keysight N5231A/32A/39A Service Guide...
Page 111 2. Disconnect cables W76, W77, and W78, one at a time, from the A7 frequency reference board. 3. Connect the spectrum analyzer to the open connector on the A7 frequency reference board. 4. The spectrum analyzer should measure a signal at 50 MHz. Keysight N5231A/32A/39A Service Guide 4-33...
Page 112 2. Disconnect W1 from J1207. 3. Connect the spectrum analyzer to J1207. 4. Set the network analyzer for a 800 MHz CW frequency and observe the spectrum analyzer measurement. The spectrum analyzer should measure a signal at 800 MHz. 4-34 Keysight N5231A/32A/39A Service Guide...
Page 113 — W33 for Port 1 of analyzers without Option 416 (no source attenuators) — W34 for Port 2 of analyzers without Option 416 (no source attenuators) — W35 for Port 3 of analyzers without Option 416 (no source attenuators) Keysight N5231A/32A/39A Service Guide 4-35...
Page 114 4. With the covers off, plug in the analyzer and turn on the power. 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. 4-36 Keysight N5231A/32A/39A Service Guide...
Page 115 4. The measured output power on the power meter should be at least the preset power level ±1 dB over the entire frequency range. — If the measured power is correct, go to “Checking the Receiver Group” on page 4-39. Keysight N5231A/32A/39A Service Guide 4-37...
Page 116 “Bottom Assemblies, N523xA, Option 216” on page 6-26 — “Bottom Cables, N523xA, Option 216” on page 6-28 — “Bottom Assemblies, N5231A and N5232A, Option 400” on page 6-32 — “Bottom Cables, N5231A and N5232A, Option 400” on page 6-34 —...
Page 117 “Bottom Assemblies, N523xA, Option 216” on page 6-26 — “Bottom Cables, N523xA, Option 216” on page 6-28 — “Bottom Assemblies, N5231A and N5232A, Option 400” on page 6-32 — “Bottom Cables, N5231A and N5232A, Option 400” on page 6-34 —...
Page 118 4. The measured signal on the spectrum analyzer should be at 7.61 MHz. 5. If the measured signal is missing on any receiver, replace the A24 mixer brick. Refer to “Removing and Replacing the A24 Mixer Brick (QuintBrick)”. 4-40 Keysight N5231A/32A/39A Service Guide...
Page 119 Troubleshooting Instrument Block Diagrams Sheet 1 Instrument Block Diagrams Sheet 1 Microwave PNA, N523xA, 2-port Model Keysight N5231A/32A/39A Service Guide 4-41...
Page 120 N5231A/32A/39A 2-Port Overall Block Diagram Includes Options 200-Standard; 216-Configurable Test Set and Source Attenuators DISPLAY USB BD Service Guide: N5232-90001 A9 SIGNAL PROCESSING A24 MIXER BRICK (QuintBrick) OPTION 200 IF = 16 - 18 MHz for CW Freq < 7.5 MHz ADC MODULE (SPAM) IF = 0.826 MHz for CW Freq >...
Page 121 Troubleshooting Instrument Block Diagrams Sheet 2 Instrument Block Diagrams Sheet 2 Microwave PNA, N523xA, 4-port Model Keysight N5231A/32A/39A Service Guide 4-43...
Page 122 N5231A/32A 4-Port Overall Block Diagram (Includes Options 400-Standard; 416-Configurable Test Set and Source Attenuator DISPLAY USB BD Service Guide: N5232-90001 A9 SIGNAL PROCESSING A24 MIXER BRICK (QuintBrick) OPTION 400 IF = 16 - 18 MHz for CW Freq < 7.5 MHz ADC MODULE (SPAM) IF = 0.826 MHz for CW Freq >...
Page 123 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L Service Guide Theory of Operation Information in This Chapter This chapter provides a general description of the operating theory of the N523xA 2-port and 4-port PNA microwave network analyzers. —...
Page 124 Digital Processing and Digital Operation of the assemblies associated with digital page 5-23 Control Group Operation processing and digital control. Power Supply Group Operation Operation of the power supply assembly group. page 5-28 Keysight N5231A/32A/39A Service Guide...
Page 125 Figure 5-1 is a simplified block diagram of the 4-port network analyzer system Figure 5-2 is a simplified block diagram of the 2-port network analyzer system. Figure 5-1 4-Port System Simplified Block Diagram Keysight N5231A/32A/39A Service Guide...
Page 126 The major functional groups are: — Synthesized Source Group — Signal Separation Group — Receiver Group — Digital Processor and Digital Control Group — Power Supply Group Keysight N5231A/32A/39A Service Guide...
Page 127 “Receiver Group Operation” on page 5-20. 1. For frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the online Keysight document, “N523xA Data Sheet and Technical Specifications.” See the hyperlink above. Keysight N5231A/32A/39A Service Guide...
Page 128 “Digital Processing and Digital Control Group Operation” on page 5-23. Power Supply Group The power supply functional group provides power for the other assemblies in the instrument. Refer to “Power Supply Group Operation” on page 5-28. Keysight N5231A/32A/39A Service Guide...
Page 129 LO signal is normally 5.785 MHz higher than the test signal. Since the A4 and A10 13.5 GHz synthesizer boards each receive their 50 MHz input reference signal from the exact same source, frequency drift error is eliminated. Keysight N5231A/32A/39A Service Guide...
Page 130 Theory of Operation Synthesized Source Group Operation Figure 5-3 2-Port Source Group Keysight N5231A/32A/39A Service Guide...
Page 131 Theory of Operation Synthesized Source Group Operation Figure 5-4 4-Port Source Group Keysight N5231A/32A/39A Service Guide...
Page 132 In bands 1–9, the output of the swept VCO is passed directly or through a divide-by-2, 4, or 8 circuit to produce the output frequencies as listed in Table 5-1. 5-10 Keysight N5231A/32A/39A Service Guide...
Page 133 10 MHz reference signal for the A9 signal processing ADC module (SPAM) board. The VCO output is also divided by two to produce 50 MHz reference signals for the A4 and A10 13.5 GHz synthesizer boards. Keysight N5231A/32A/39A Service Guide 5-11...
Page 134 Connector settings can be changed using SCPI and COM commands. The settings are not accessible from the front panel. Table 5-3 on page 5-15 PWR I/O A DB-9 female connector. Pin assignments are listed in 5-12 Keysight N5231A/32A/39A Service Guide...
Page 135 TTL out, test set select bit 3, tied to 0 V 19–21 AD7–5 TTL I/O, address and latched data 22–23 AD0–1 TTL I/O, address and latched data TTL out, active low data strobe (1 μs min) TTL out, high = read, low = write Keysight N5231A/32A/39A Service Guide 5-13...
Page 136 TTL out, latched, indicates pass fail (programmable polarity) +5 V +5 Vdc, 100 mA max. Sweep End TTL out, active low (10 μs min) indicates sweep done Pass/Fail Write TTL out, active low pass/fail write strobe (1 μs min) Strobe 5-14 Keysight N5231A/32A/39A Service Guide...
Page 137 Analog input: ±10 V @ 1.22 mV typical resolution Rin > 1 M-ohm BW ≈ 1 MHz ADC conversion time < 1 us typical Power Button Open collector input Active low replicates power button key press. Keysight N5231A/32A/39A Service Guide 5-15...
Page 138 — the A20 MASSQuad and the A28 test port 4 bridge coupler 2-port models: — the A25 test port 1 bridge coupler and the A24 mixer brick receiver A — the A28 test port 2 bridge coupler and the A24 mixer brick receiver B 5-16 Keysight N5231A/32A/39A Service Guide...
Page 139 A, B, C, and D for 4-port models or inputs A and B for 2-port models. The coupling coefficient of the directional couplers is nominally 15 dB over the full frequency range. Keysight N5231A/32A/39A Service Guide 5-17...
Page 140 Theory of Operation Signal Separation Group Operation Figure 5-6 4-Port Signal Separation Group 5-18 Keysight N5231A/32A/39A Service Guide...
Page 141 They are electro-mechanical step attenuators that provide 0 to 60 dB of attenuation in 5-dB steps. They adjust the power level to the DUT without changing the level of the incident power in the reference path. These attenuators are controlled by the A17 CPU board. Keysight N5231A/32A/39A Service Guide 5-19...
Page 142 The processed and formatted data is finally routed to the display, and to the general-purpose interface bus (GPIB) for remote operation. Refer to “Digital Processing and Digital Control Group Operation” on page 5-23 for more information on signal processing. 5-20 Keysight N5231A/32A/39A Service Guide...
Page 143 Theory of Operation Receiver Group Operation Figure 5-8 4-Port Receiver Group Keysight N5231A/32A/39A Service Guide 5-21...
Page 144 Theory of Operation Receiver Group Operation Figure 5-9 2-Port Receiver Group 5-22 Keysight N5231A/32A/39A Service Guide...
Page 145 A1 Front Panel Interface Board — A2 USB Board — A3 Display Assembly — Keypad Assembly — Data Acquisition and Processing Subgroup — A9 SPAM Board (Digital Description) — A17 CPU Board — A51 Solid State Drive Keysight N5231A/32A/39A Service Guide 5-23...
Page 146 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-10 Digital Processing and Digital Control Group 5-24 Keysight N5231A/32A/39A Service Guide...
Page 147 The video data received from the A17 CPU board includes the following: • digital TTL horizontal sync • digital TTL red video • blanking • digital TTL vertical sync • digital TTL green video • data clock • digital TTL blue video Keysight N5231A/32A/39A Service Guide 5-25...
Page 148 RAM. It controls the DSP, the video processor, and the interconnect port interfaces. In addition, when the analyzer is in the system controller mode, the CPU controls peripheral devices through the peripheral port interfaces. See also, Note on page 5-1. 5-26 Keysight N5231A/32A/39A Service Guide...
Page 149 (IDE) data storage device which is connected directly to, and physically mounted within the enclosure of, the A17 CPU board. The full operating system and firmware for the network analyzer is stored on the A51 solid state drive. Keysight N5231A/32A/39A Service Guide 5-27...
Page 150 The +15 V standby supply remains on continuously whenever the power supply is plugged in. This supply is used to provide power to front panel LEDs and CPU components when the analyzer is turned off. 5-28 Keysight N5231A/32A/39A Service Guide...
Page 151 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 provide the location of the replaceable parts in page 6-6 your analyzer by type of part: —...
Page 152 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 2-6.
Page 153 Step 5. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Step 6. Keysight personnel: see Figure 1-1 on page 1-6 to review where the calibration stickers should be placed on the PNA. Keysight N5231A/32A/39A Service Guide...
Page 154 — The defective assembly must be returned for credit under the terms of the rebuilt-exchange assembly program. — Spare assembly stock desired should be ordered using the new assembly part number. Keysight N5231A/32A/39A Service Guide...
Page 155 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5231A/32A/39A Service Guide...
Page 156 Signal processing ADC module (SPAM) board 13.5 GHz LO synthesizer board Not used Not used Not used System motherboard Midplane board Power supply assembly “Internal Hardware and Miscellaneous Parts, All Models” on CPU board page 6-46 GPIB board Keysight N5231A/32A/39A Service Guide...
Page 157 Source 60 dB step attenuator (Option 216 only) A31 - A50 Not used Solid state drive assembly (SSDA) “Internal Hardware and Miscellaneous Parts, All Models” on page 6-46 Table 6-2 Part Number Listing by Type of Part Assemblies and Cables Keysight N5231A/32A/39A Service Guide...
Page 158 “Bottom Assemblies, N5231A and N5232A, Option 400” on page 6-32 — “Bottom Cables, N5231A and N5232A, Option 400” on page 6-34 — “Bottom Ribbon Cables, N5231A and N5232A, Option 400” on page 6-36 — “Bottom Assemblies, N5231A and N5232A, Option 416” on page 6-38 —...
Page 159 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5231A/32A/39A Service Guide...
Page 160 (2 used on 2-port models; 4 used on 4-port models.) 0515-2044 Machine screw (x12), M4.0 x 12 flat head (To attach front frame to chassis.) Machine screw (x8), M4.0 x 12 flat head (To attach front handles to front panel.) 6-10 Keysight N5231A/32A/39A Service Guide...
Page 161 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5231A/32A/39A Service Guide 6-11...
Page 162 Power button keypad W1312-60047 Touch screen controller board cable harness Was 8121-1452 8121-1451 Power switch cable harness 1400-0510 Cable clamp (with adhesive backing) 0515-0667 Machine screw, M3.0 x 25 pan head (To attach display to front frame.) 6-12 Keysight N5231A/32A/39A Service Guide...
Page 163 Associated parts are indicated in this table with either “Tube” or “LED.” If you replace an old part number <designated “Tube”> with its new part number <designated “LED”>, you must also replace ALL of the other old part numbers <designated “Tube”> in the table with their new part numbers <designated “LED”>. Keysight N5231A/32A/39A Service Guide 6-13...
Page 164 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 N5231A/32A/39A Service Guide...
Page 165 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Keysight N5231A/32A/39A Service Guide 6-15...
Page 166 13.5 GHz source synthesizer board Was N5242-60150 N5240-60069 Frequency reference board N5240-60077 Signal processing ADC module (SPAM) board Was N5240-60056 N5240-60074 13.5 GHz LO synthesizer board Was N5242-60150 N5230-60133 System motherboard W1312-60095 Midplane board 0950-4934 Power supply assembly 6-16 Keysight N5231A/32A/39A Service Guide...
Page 167 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Models Keysight N5231A/32A/39A Service Guide 6-17...
Page 168 A7 frequency reference board J5 to A10 13.5 GHz LO Synthesizer board J5 N5242-60029 A7 frequency reference board J6 to A4 13.5 GHz Source Synthesizer board J5 a. SR = semirigid coaxial cable; F = flexible coaxial cable. 6-18 Keysight N5231A/32A/39A Service Guide...
Page 169 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Models Keysight N5231A/32A/39A Service Guide 6-19...
Page 170 Test port 2 bridge coupler N5240-60058 Front-panel LED board  a. The 2-port PNA A24 mixer brick (5087-7831) contains only four receivers. The 4-port PNA A24 mixer brick (5087-7823) contains five receivers. These items are NOT interchangeable. 6-20 Keysight N5231A/32A/39A Service Guide...
Page 171 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, N523xA, Option 200 Keysight N5231A/32A/39A Service Guide 6-21...
Page 172 A19 test set motherboard J5 to A21 MASSY J5 N5235-60024 A19 test set motherboard J3 to A21 MASSY J3 1250-4261 Load, 50 ohm, SMA (installed on QuintBrick)  Was: 1810-0118 a. SR = semirigid coaxial cable; F = flexible coaxial cable. 6-22 Keysight N5231A/32A/39A Service Guide...
Page 173 Replaceable Parts Replaceable Parts Listings Figure 6-9 Bottom Cables, N523xA, Option 200 Keysight N5231A/32A/39A Service Guide 6-23...
Page 174 A14 system motherboard J1 to A19 test set motherboard J1  8121-0834 Rear-panel HANDLER I/O to A19 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness. 6-24 Keysight N5231A/32A/39A Service Guide...
Page 175 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables, N523xA, Option 200 Keysight N5231A/32A/39A Service Guide 6-25...
Page 176 Test port 2 source 60 dB step attenuator N5240-60058 Front-panel LED board  a. The 2-port PNA A24 mixer brick (5087-7831) contains only four receivers. The 4-port PNA A24 mixer brick (5087-7823) contains five receivers. These items are NOT interchangeable. 6-26 Keysight N5231A/32A/39A Service Guide...
Page 177 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, N523xA, Option 216 Keysight N5231A/32A/39A Service Guide 6-27...
Page 178 A19 test set motherboard J5 to A21 MASSY J5 N5235-60024 A19 test set motherboard J3 to A21 MASSY J3 1250-4261 Load, 50 ohm, SMA (installed on QuintBrick) Was: 1810-0118 a. SR = semirigid coaxial cable; F = flexible coaxial cable. 6-28 Keysight N5231A/32A/39A Service Guide...
Page 179 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom Cables, N523xA, Option 216 Keysight N5231A/32A/39A Service Guide 6-29...
Page 180 A14 system motherboard J1 to A19 test set motherboard J1  8121-0834 Rear-panel HANDLER I/O to A19 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness. 6-30 Keysight N5231A/32A/39A Service Guide...
Page 181 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables, N523xA, Option 216 Keysight N5231A/32A/39A Service Guide 6-31...
Page 182 Replaceable Parts Replaceable Parts Listings Bottom Assemblies, N5231A and N5232A, Option 400 Reference Part Number Description Designator N5230-60134 Test set motherboard 5087-7762 MASSQuad (Multiplier/amplifier/switch/splitter assembly) Mixer brick (QuintBrick) 5087-7823 critical footnote Was 5087-7761 5087-7752 Test port 1 bridge coupler Test port 2 bridge coupler...
Page 183 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Assemblies, N5231A and N5232A, Option 400 Keysight N5231A/32A/39A Service Guide 6-33...
Page 184 Replaceable Parts Replaceable Parts Listings Bottom Cables, N5231A and N5232A, Option 400 Reference Part Number Description Type Designator Refer to “Top Cables, All Models” on page 6-18. Refer to “Top Cables, All Models” on page 6-18. N5232-20081 A24 mixer brick LO In to test set deck cable bracket...
Page 185 Replaceable Parts Replaceable Parts Listings Figure 6-15 Bottom Cables, N5231A and N5232A, Option 400 Keysight N5231A/32A/39A Service Guide 6-35...
Page 186 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables, N5231A and N5232A, Option 400 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A19 test set motherboard J301  N5225-60001 A19 test set motherboard J12 to ports 1/2 LED board J1 ...
Page 187 Replaceable Parts Replaceable Parts Listings Figure 6-16 Bottom Ribbon Cables, N5231A and N5232A, Option 400 Keysight N5231A/32A/39A Service Guide 6-37...
Page 188 Replaceable Parts Replaceable Parts Listings Bottom Assemblies, N5231A and N5232A, Option 416 Reference Part Number Description Designator N5230-60134 Test set motherboard 5087-7762 MASSQuad (Multiplier/amplifier/switch/splitter assembly) Mixer brick (QuintBrick) 5087-7823 critical footnote Was 5087-7761 5087-7752 Test port 1 bridge coupler Test port 2 bridge coupler...
Page 189 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom Assemblies, N5231A and N5232A, Option 416 Keysight N5231A/32A/39A Service Guide 6-39...
Page 190 Replaceable Parts Replaceable Parts Listings Bottom Cables, N5231A and N5232A, Option 416 Reference Part Number Description Type Designator Refer to “Top Cables, All Models” on page 6-18. Refer to “Top Cables, All Models” on page 6-18. N5232-20081 A24 mixer brick LO In to test set deck cable bracket...
Page 191 Replaceable Parts Replaceable Parts Listings Figure 6-18 Bottom Cables, N5231A and N5232A, Option 416 Keysight N5231A/32A/39A Service Guide 6-41...
Page 192 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables, N5231A and N5232A, Option 416 Reference Part Number Description Type Designator N5242-60005 Rear-panel PWR I/O to A19 test set motherboard J301  N5225-60001 A19 test set motherboard J12 to ports 1/2 LED board J1 ...
Page 193 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Cables, N5231A and N5232A, Option 416 Keysight N5231A/32A/39A Service Guide 6-43...
Page 194 0515-0374 Machine screw, M3.0 x 10, pan head (to attach test set support bracket from test set wall to test set base) 0515-0430 Machine screw M3.0 x 6 pan head (to attach: QuintBrick to deck) 6-44 Keysight N5231A/32A/39A Service Guide...
Page 195 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom Hardware and Miscellaneous Parts, All Options Keysight N5231A/32A/39A Service Guide 6-45...
Page 196 Solid state drive (SSD) for Windows 7 Operating System- N8984A Version 7 to be used with the 2.2 GHz CPU board W1312-60211 All prefixes – Solid state drive (SSD) for Windows 7 Operating System N8983 Version 6, & 6.1 6-46 Keysight N5231A/32A/39A Service Guide...
Page 197 You can learn about your System CPU version using the PNA software. On the PNA front panel, press Help > About Network Analyzer. In the window displayed, find “System CPU Version.” g. See also, https://www.keysight.com/us/en/assets/9922-01369/miscellaneous/PNA-Hard-Drives-and-CPUs.pdf. Keysight N5231A/32A/39A Service Guide 6-47...
Page 198 Replaceable Parts Replaceable Parts Listings Figure 6-21 Internal Hardware and Miscellaneous Parts, All Models 6-48 Keysight N5231A/32A/39A Service Guide...
Page 199 Machine screw M4.0 x 25, pan head (to attach rear feet) 0515-0710 Machine screw M5.0 x 18, flat head 0515-2044 Machine screw, M4.0 x 10 flat head (to attach: front handles to front frame; front frame to chassis) Keysight N5231A/32A/39A Service Guide 6-49...
Page 200 Replaceable Parts Replaceable Parts Listings Figure 6-22 External Hardware and Miscellaneous Parts, All Models 6-50 Keysight N5231A/32A/39A Service Guide...
Page 201 Miscellaneous Parts, All Models” on page 6-46 for the part number. 0515-0372 Machine screw, M3.0 x 8, pan head (to secure: rear panel; rear panel power supply bracket; CPU board; handler i/o cable to rear panel;) Keysight N5231A/32A/39A Service Guide 6-51...
Page 202 Service Guide. (Not available in printed form. Part number is for reference only. Must be printed N5232-90001 from the Keysight Web site.) Protective Caps for Connectors Protective cap for GPIB connector and GPIB Talker/Listener connector 1252-5007 6-52 Keysight N5231A/32A/39A Service Guide...
Page 203 9170-1702 Upgrade Kits and Accessories To see a list of the upgrade kits and accessories available for the network analyzers, refer to the Keysight PNA Family Microwave Network Analyzers Configuration Guide, available online at http://literature.cdn.keysight.com/litweb/pdf/5990-7745EN.pdf. Keysight N5231A/32A/39A Service Guide 6-53...
Page 204 Parchment white (for use on rack mount flanges, rack support flanges, and front 6010-1148 panels) a. For rack mount use, you must replace factory installed ruggedized handles (thick aluminum, no trim) with classic handles (thin aluminum with plastic trim), included with Option 1CP. 6-54 Keysight N5231A/32A/39A Service Guide...
Page 205 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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.
Page 206 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 207 The front panel switch is only a standby switch and is not a LINE switch (disconnecting device). Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to manufacturer’s instructions. Keysight N5231A/32A/39A Service Guide...
Page 208 To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-7, for all of the procedures in this chapter. Keysight N5231A/32A/39A Service Guide...
Page 209 Step 3. Replace the faulty assembly and determine what adjustments are necessary. Refer to “Post-Repair Procedures” in this chapter. Step 4. Perform the necessary adjustments. Refer to Chapter 3, “Tests and Adjustments.” Step 5. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Keysight N5231A/32A/39A Service Guide...
Page 210 60 dB source step attenuator page 7-31 60 dB source step attenuator (Option 216 only) Solid state drive assembly (SSDA) page 7-32 Rear panel page 7-34 Front Panel LED boards page 7-35 Fans page 7-37 Battery page 7-39 Keysight N5231A/32A/39A Service Guide...
Page 211 Repair and Replacement Procedures Removal and Replacement Procedures This page intentionally left blank. Keysight N5231A/32A/39A Service Guide...
Page 212 Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5231A/32A/39A Service Guide...
Page 213 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5231A/32A/39A Service Guide...
Page 214 When reconnecting the front-panel jumpers, torque the connectors to 10 in-lb. 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 7-41. 7-10 Keysight N5231A/32A/39A Service Guide...
Page 215 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal Keysight N5231A/32A/39A Service Guide 7-11...
Page 216 6. The keypad assembly can now be removed from the A1 front panel interface board by gently pulling each of the rubber tabs through the PC board. 7-12 Keysight N5231A/32A/39A Service Guide...
Page 217 ) and remove the power switch board. 3. The power button keypad can now be removed from the power switch board by gently pulling each of the rubber tabs through the PC board. Figure 7-3 Front Panel Subassemblies Removal Keysight N5231A/32A/39A Service Guide 7-13...
Page 218 To replace the touch screen, note the orientation of the rubber boot on the old touch screen and then remove it and install it on the new one in the same orientation. Figure 7-4 A3 Display Assembly and Touch Screen Removal-1 7-14 Keysight N5231A/32A/39A Service Guide...
Page 219 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. Refer to Table 7-2 on page 7-41. Keysight N5231A/32A/39A Service Guide 7-15...
Page 220 4. Disconnect cables (if any) connected to the top of the board to be removed. 5. Lift the two ejectors, one at each end of the board, and lift the board. 6. Before removing the board, disconnect cables (if any) connected to the bottom of the board. 7-16 Keysight N5231A/32A/39A Service Guide...
Page 221 The fractional-N synthesizer boards will not perform correctly and will cause the PNA to display errors until the Synthesizer Bandwidth Adjustment and the EE Default Adjustment are completed, as per Table 7-2 on page 7-41. Keysight N5231A/32A/39A Service Guide 7-17...
Page 222 13. Turn the analyzer over so that the bottom side is up and remove the A19 Test Set Motherboard. Refer to “Removing and Replacing the A19 Test Set Motherboard” on page 7-26. Disconnect the ribbon cable from the A14 System Motherboard. 7-18 Keysight N5231A/32A/39A Service Guide...
Page 223 20. Lift the A14 system motherboard out of the analyzer. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-19...
Page 224 Repair and Replacement Procedures Removing and Replacing the A14 System Motherboard Figure 7-6 A14 System Motherboard Removal 7-20 Keysight N5231A/32A/39A Service Guide...
Page 225 8. Lift the A15 midplane board out of the analyzer. Replacement Procedure 1. Reverse the order of the removal procedure. Be careful to align the guide pins on the A15 midplane board connectors with the slots on the A14 system motherboard connectors. Keysight N5231A/32A/39A Service Guide 7-21...
Page 226 Remember to install the six rubber grommets on the bottom three alignment pins. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-41. 7-22 Keysight N5231A/32A/39A Service Guide...
Page 227 5. Slide out and remove the A16 power supply assembly. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-23...
Page 228 “Removing and Replacing the A51 Solid State Drive (SSD)” on page 7-32. 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 7-41. 7-24 Keysight N5231A/32A/39A Service Guide...
Page 229 6. Slide the A18 GPIB board out the rear of the analyzer. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-25...
Page 230 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 7-41. 7-26 Keysight N5231A/32A/39A Service Guide...
Page 231 6. Remove the A20 MASSQuad from the analyzer. Observe the CAUTION above. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-27...
Page 232 6. Remove the A21 MASSY from the analyzer. Observe the CAUTION above. 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 7-41. 7-28 Keysight N5231A/32A/39A Service Guide...
Page 233 6. Remove the A24 mixer brick from the analyzer. Observe the CAUTION above. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-29...
Page 234 1. Reverse the order of the removal procedure. Torque all connectors to 10 in-lbs. Torque coupler nuts to 72 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-41. 7-30 Keysight N5231A/32A/39A Service Guide...
Page 235 1. Reverse the order of the removal procedure using the existing attenuator ribbon cable. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-41. Keysight N5231A/32A/39A Service Guide 7-31...
Page 236 1. Disconnect the analyzer power cord. 2. Position the analyzer for access to the rear panel. 3. Loosen the SSD thumb screw. 4. Pull the SSD out from the CPU board, using the handle. 7-32 Keysight N5231A/32A/39A Service Guide...
Page 237 Install Backup Files onto the New Solid State Drive The files that were previously saved onto a USB flash memory drive must now be installed onto the new SSD. The network analyzer must be powered up and operating. Keysight N5231A/32A/39A Service Guide 7-33...
Page 238 7. Slide the rear panel over the cable connectors and off of the analyzer. 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 7-41. 7-34 Keysight N5231A/32A/39A Service Guide...
Page 239 LED board from the analyzer. 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 7-41. Keysight N5231A/32A/39A Service Guide 7-35...
Page 240 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards This page intentionally left blank. 7-36 Keysight N5231A/32A/39A Service Guide...
Page 241 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 7-41. Keysight N5231A/32A/39A Service Guide 7-37...
Page 242 Repair and Replacement Procedures Removing and Replacing the Fans Figure 7-7 Fan Removal 7-38 Keysight N5231A/32A/39A Service Guide...
Page 243 1. Reverse the order of the removal procedure following all instructions included with the new battery. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-41. Keysight N5231A/32A/39A Service Guide 7-39...
Page 244 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-8 Lithium Battery Removal 7-40 Keysight N5231A/32A/39A Service Guide...
Page 245 A16 power supply assembly No adjustment needed None needed A9 SPAM board No adjustment needed Noise Floor Test Trace Noise Test A4 13.5 GHz source synthesizer Frequency Accuracy Test Default EE Adjustment board The Operator’s Check Keysight N5231A/32A/39A Service Guide 7-41...
Page 246 IF Response Adjustment (Option 090, 093, or 094 Only) A24 Mixer brick (QuintBrick) Receiver Adjustment Receiver Compression Test IF Response Adjustment Noise Floor Test (Option 090, 093, or 094 Calibration Coefficients Test Only) Dynamic Accuracy Test 7-42 Keysight N5231A/32A/39A Service Guide...
Page 247 1. Click Utility > System > Service > Diagnostics > Mechanical Counter 2. In the Mechanical Cycle Counter window that opens: a. Click all of the items that apply. b. When satisfied, click on Modify. c. Click Exit. Keysight N5231A/32A/39A Service Guide 7-43...
Page 248 EEPROM memory and in flash memory files. The adjustments listed here generate new correction constants. The analyzer must have a backup of this new data in case any of the data becomes corrupted. 7-44 Keysight N5231A/32A/39A Service Guide...
Page 249 — 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 Keysight N5231A/32A/39A Service Guide 7-45...
Page 250 Repair and Replacement Procedures Post-Repair Procedures 7-46 Keysight N5231A/32A/39A Service Guide...
Page 251 Keysight Microwave Network Analyzers and RF Network Analyzer 2-Port and 4-Port PNA-L 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 252 You can use the error terms as a tool to isolate faulty assemblies in the signal separation group of your analyzer. You can compare the current values to preventive maintenance records or to the typical values listed in Table 8-1 on page 8-8. Keysight N5231A/32A/39A Service Guide...
Page 253 Figure 8-4 illustrate the error terms associated with measurement calibration for 1-port, 2-port, 3-port, and 4-port configurations respectively. Figure 8-1 Flowgraph of One-Port Error Terms for Port 1 where: E = Error term Subscript: D = Directivity Keysight N5231A/32A/39A Service Guide...
Page 254 R = Reflection Tracking X = Crosstalk (Isolation) L = Load Match T = Transmission Tracking 2nd Subscript: F = forward measurement (Port 1 to Port 2) R = reverse measurement (Port 2 to Port 1) Keysight N5231A/32A/39A Service Guide...
Page 255 For the case of a full 3-port calibration, port 1 has three Match error terms: S11 source match S12 load match S13 load match and three Tracking error terms: S11 reflection tracking S12 transmission tracking S13 transmission tracking There are six isolation terms not shown. Keysight N5231A/32A/39A Service Guide...
Page 256 Tracking error terms: S11 reflection tracking S12 transmission tracking S13 transmission tracking S12 transmission tracking There are eight isolation (crosstalk) terms not shown. Accessing Error Terms Error terms can be accessed either manually or programmatically: Manually Keysight N5231A/32A/39A Service Guide...
Page 257 You can access error terms by way of Component Object Model (COM) or Distributed Component Object Model (DCOM) software architecture. For more information on COM and DCOM, refer to the embedded help in the analyzer. Type in keyword “errors, systematic” in the index. Keysight N5231A/32A/39A Service Guide...
Page 258 S reflection of the calibration kit load. The load has a much better return loss specification than does the uncorrected test port. Therefore, any power detected from this measurement is assumed to be from directivity error. Keysight N5231A/32A/39A Service Guide...
Page 259 Typical Cause of Failure The calibration kit load or a bad “thru” cable is the most common cause of load match specification failure. Keysight N5231A/32A/39A Service Guide...
Page 260 All transmission measurements are affected by transmission tracking errors. Typical Cause of Failure The test port cable is the most common cause of transmission tracking specification failure. If the test port cable performance has been independently verified, suspect the following: 8-10 Keysight N5231A/32A/39A Service Guide...
Page 261 After verifying the cable and its connections, suspect the analyzer switch splitter, step attenuator, coupler, or receivers, and associated cabling. To troubleshoot, refer to “Checking the Receiver Group” on page 4-39 or to “Checking the Signal Separation Group” on page 4-36. Keysight N5231A/32A/39A Service Guide 8-11...
Page 262 Using the current Host ID will cause a license to be generated that will not work with the instrument. To determine the new Host ID, refer “Identifying Your Instrument’s Host ID” on page 8-13. 8-12 Keysight N5231A/32A/39A Service Guide...
Page 263 1. Start the option enable utility. Refer to “Accessing the Option Enable Utility” on page 8-12. 2. Click the arrow in the Select Desired Option box. A list of available options, similar to the list below, will appear. Keysight N5231A/32A/39A Service Guide 8-13...
Page 264 Option Enable Dialog Box or the About Network Analyzer display, you should regenerate the options license file, gen.lic: 1. Exit the Network Analyzer application. 2. Remove (or rename) the existing gen.lic file: a. Open Windows Explorer and navigate to C:\Program Files\Keysight\Network Analyzer. 8-14 Keysight N5231A/32A/39A Service Guide...
Page 265 Keysight, enter the clear code in the space provided, and then click Clear. The correct serial number can then be entered. 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 2-6. Keysight N5231A/32A/39A Service Guide 8-15...
Page 266 — On the System menu, point to Service, and then click AgileUpdate. AgileUpdate compares the firmware revision currently installed in your network analyzer to the latest version available and assists you in downloading and installing the most recent version. 8-16 Keysight N5231A/32A/39A Service Guide...
Page 267 Recovery” link on the Keysight PNA Series: Service & Support Home Page on the Internet. The URL for the Keysight PNA Series: Service & Support Home Page is: https://support.keysight.com/s/ The URL for the Hard Drive Recovery page is: https://www.keysight.com/us/en/assets/9922-01369/miscellaneous/PNA-H ard-Drives-and-CPUs.pdf Keysight N5231A/32A/39A Service Guide 8-17...
Page 268 — Navigate to the EEPROM Backup Utility, located at: C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program. — Click Backup EEPROM. — Click Exit when the program has finished. See also, “EEPROM Backup” on page 7-44. 8-18 Keysight N5231A/32A/39A Service Guide...
Page 269 A20 MASSQuad procedure procedure illustrated , 33, troubleshooting troubleshooting operation , 38, A14 system motherboard A29 60 dB source step part number illustrated attenuator removal and replacement operation illustrated procedure , 27, part number operation troubleshooting Keysight N5231A/32A/39A Service Guide...
Page 270 SPAM board–analog frequency reference board procedure SPAM board–digital assembly accessories test port couplers front panel interconnects analyzer test front panel jumper guard in operator’s check Keysight N5231A/32A/39A Service Guide...
Page 271 C receiver coefficients test digital processor group troubleshooting kits receiver group , 4, , 21, typical power output substitution Keysight N5231A/32A/39A Service Guide...
Page 272 CPU board definition of compression test, receiver measurements affected by See A17 configurable test set cross-over cable, LAN disabling operation Keysight N5231A/32A/39A Service Guide...
Page 273 SCPI commands part number stability check (using GPIB) interconnects of operator’s check cause of failure to interface board of return loss check description of Keysight N5231A/32A/39A Service Guide...
Page 274 TEST SET I/O hard disk drive procedures subgroup See A51 hardware touch screen TEST SET I/O bottom hardware illustrated pin assignments illustrated parts list internal analyzer part numbers Keysight N5231A/32A/39A Service Guide...
Page 275 OCXO (oven-controlled crystal test part numbers oscillator) troubleshooting magnitude check frequency adjustment failure of theory of operation test port cables operating maintenance environment cleaning Keysight N5231A/32A/39A Service Guide...
Page 276 Keysight N5231A/32A/39A Service Guide...
Page 277 See specific as- rebuilt-exchange assemblies safety sembly. program considerations cover receiver earth ground options Keysight N5231A/32A/39A Service Guide...
Page 278 , 38, performing strap handle single band failure procedure analyzer software illustrated what it verifies options part number system motherboard solid state drive subgroup See A14 See A51 data acquisition and source processing Keysight N5231A/32A/39A Service...
Page 279 B output power linearity test power output of receiver C troubleshooting all test port 1 bridge coupler power output of receiver D traceability power up measurement See A25 power supply check path Keysight N5231A/32A/39A Service Guide...
Page 280 Windows USB board front panel Keysight N5231A/32A/39A Service...
Page 281 Installation Note Xxxxx-xxxxx...
Page 282 This information is subject to change without notice. © Keysight Technologies 2011-2023 Edition 2, March 2023 N5232-90001 www.keysight.com...

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