Page 1 N5234/5A 2-Port PNA-L - Microwave Network Analyzers - Service Guide N5234A (10 MHz to 43.5 GHz) N5235A (10 MHz to 50 GHz) This is the Service Guide for the N5234/5A Series Microwave Network Analyzers. SERVICE GUIDE...
Page 2: Safety Notices
PERFORMANCE OF THIS to the public to use, modify, DOCUMENT OR ANY INFORMATION reproduce, release, perform, CONTAINED HEREIN. SHOULD display, or disclose commercial KEYSIGHT AND THE USER HAVE A computer software or SEPARATE WRITTEN AGREEMENT commercial computer software WITH WARRANTY TERMS...
Page 5: Table Of Contents
Keysight Support, Services, and Assistance ........
Page 6 Check the Basics ............4-4 Keysight N5224A/25A Service Guide...
Page 7 A24 Mixer Brick ............5-17 Keysight N5224A/25A Service Guide...
Page 8 Removing and Replacing the A4, A7, A9, and A10 Boards ......7-16 Keysight N5224A/25A Service Guide...
Page 9 Operating System Recovery ..........8-14 Keysight N5224A/25A Service Guide...
Page 10 Storing Correction Constants ..........8-15 Keysight N5224A/25A Service Guide...
Page 11: Safety And Regulatory Information
Keysight Microwave Network Analyzers 2-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 12: Safety Symbols
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 N5234A/35A Service Guide...
Page 13: General Safety Considerations
Any interruption of the protective conductor, inside or outside of the instrument, will make the instrument dangerous. Intentional interruption is prohibited. Use Keysight supplied power cord or one with same or better electrical rating. Always use the three-prong AC power cord supplied with this product.
Page 14 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 N5234A/35A Service Guide...
Page 15: Servicing
LINE switch (disconnecting device). 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.
Page 16 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5234A/35A Service Guide...
Page 17: Electrostatic Discharge Protection
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 6-41 for part numbers. Keysight N5234A/35A Service Guide...
Page 18 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5234A/35A Service Guide...
Page 19: Regulatory Information
This is a marking to indicate product compliance with the Canadian Interference-Causing ICES/NMB-001 Equipment Standard (ICES-001). Direct Current. IP 2 0 The instrument has been designed to meet the requirements of IP 2 0 for egress and operational environment. Keysight N5234A/35A Service Guide...
Page 20: Lithium Battery Disposal
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 21: General Product Information
Maintenance page 2-2 analyzer. Information about electrical maintenance of your analyzer. A hyperlink to the Keysight PNA Family Microwave Analyzer Options, Accessories, and page 2-3 Network Analyzers Configuration Guide, which includes Upgrades Available a list of options, accessories, and upgrades available for the microwave network analyzers.
Page 22: Maintenance
Do not attempt to clean internally. Physical Maintenance Clean the cabinet, including the front panel, using a dry or slightly damp cloth only. Electrical Maintenance Refer to “Review the Principles of Connector Care” on page 3-5. Keysight N5234A/35A Service Guide...
Page 23: Analyzer Options, Accessories, And Upgrades Available
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, 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.
Page 24: Required Service Test Equipment
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 N5234A/35A Service Guide...
Page 25 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 N5234A/35A Service Guide...
Page 26 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 N5234A/35A Service Guide...
Page 27: Keysight Support, Services, And Assistance
Assistance with test and measurements needs and information on finding a local Keysight office are available on the Web at: http://www.keysight.com/find/assist. If you do not have access to the Internet, please contact your Keysight field engineer. In any correspondence or telephone conversation, refer to the Keysight product by its model number and full serial number.
Page 28: 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: — Include a complete description of the service requested or of the failure and a description of any failed test and any error message.
Page 29: Tests And Adjustments
Keysight Microwave Network Analyzers 2-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 30 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 N5234A/35A Service Guide...
Page 31 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 N5234A/35A Service Guide...
Page 32: Before You Begin
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 N5234A/35A Service Guide...
Page 33: Allow The Analyzer To Warm Up
— 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 N5234A/35A Service Guide...
Page 34 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 N5234A/35A Service Guide...
Page 35: About System Verification And Performance Tests
— 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 N5234A/35A Service Guide...
Page 36: Instrument Specifications
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 N5234A/35A Service Guide...
Page 37: Certificate Of Calibration
If you have a measurement application that does not use all of the measurement capabilities of the analyzer, you may ask your local Keysight Technologies service office to verify only a subset of the specifications. However, this “limited calibration” creates the possibility of making inaccurate measurements if you then use the analyzer in an application requiring additional capabilities.
Page 38: Ansi/Ncsl Z540.3-2006 And Iso/Iec 17025 Verification
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 N5234A/35A Service Guide...
Page 39: Non-Standards Compliant Verification
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 N5234A/35A Service Guide 3-11...
Page 40: Preliminary Checks
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 N5234A/35A Service Guide...
Page 41 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 N5234A/35A Service Guide 3-13...
Page 42 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 N5234A/35A Service Guide...
Page 43 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 N5234A/35A Service Guide 3-15...
Page 44 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 N5234A/35A Service Guide...
Page 45 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 N5234A/35A Service Guide 3-17...
Page 46 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 N5234A/35A Service Guide...
Page 47 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 N5234A/35A Service Guide 3-19...
Page 48 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 N5234A/35A Service Guide...
Page 49: System Verification
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 N5234A/35A Service Guide 3-21...
Page 50: Measurement Traceability
This is accomplished by measuring the devices in a Keysight verification kit. The measurement of the devices in the verification kit has a traceable path...
Page 51: Performing System Verification
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 N5234A/35A Service Guide 3-23...
Page 52 Refer to the plots in the cable tests (earlier in this chapter) that show the performance of good cables. It is highly recommended that the test port cables be regularly tested. 3-24 Keysight N5234A/35A Service Guide...
Page 53 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.”...
Page 54 3-30. — File Tabular Data: Writes the tabular data to a text file in the Windows XP directory C:\Program Files\Keysight\Network Analyzer\Documents\ or in the Windows 7 directory C:\Users\Public\Public Documents\Network Analyzer\SysVer\. — File Graphs: Saves a screen image in PNG format in the Windows XP...
Page 55 Data selected in the Printer Output area of the System Verification dialog box. At the top of the printed output is the name of the device, the serial number of the device, and the date tested. Keysight N5234A/35A Service Guide 3-27...
Page 56 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 N5234A/35A Service Guide...
Page 57 — 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 N5234A/35A Service Guide 3-29...
Page 58 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5234A/35A Service Guide...
Page 59: Performance Tests
3. A power sensor is connected to the test port, using any necessary adapters. 4. The analyzer frequency is set to the desired value. 5. The power meter correction table is set to the same frequency. Keysight N5234A/35A Service Guide 3-31...
Page 60: Source Maximum Power Output Test
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. If the Analyzer Fails this Test: 3-32 Keysight N5234A/35A Service Guide...
Page 61: Source Power Linearity Test
“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 4-31. Keysight N5234A/35A Service Guide 3-33...
Page 62: Frequency Accuracy Test
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 N5234A/35A Service Guide...
Page 63: Receiver Compression Test
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 N5234A/35A Service Guide 3-35...
Page 64 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 N5234A/35A Service Guide...
Page 65: Noise Floor Test
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 N5234A/35A Service Guide 3-37...
Page 66: Calibration Coefficients Test
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 N5234A/35A Service Guide...
Page 67: Dynamic Accuracy Test
5. The analyzer’s receiver measurement is retrieved and compared with a perfect sine wave. Any deviation is due to receiver non-linearity. 6. The test set’s output attenuator is changed in 5 dB steps from 0 to 60 dB, and this measurement is repeated. Keysight N5234A/35A Service Guide 3-39...
Page 68: Noise State Calibration Coefficients
“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 on page 7-41 “Verification, Performance, and Other Tests and Procedures” column’s content, refer to https://cal.software.keysight.com/PNA/Help/N7840AWebHelp.htm. 3-40 Keysight N5234A/35A Service Guide...
Page 69: Adjustments
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 N5234A/35A Service Guide 3-41...
Page 70: Synthesizer Bandwidth Adjustment
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, 2.4 mm 8487A N8487A Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B None 3-42 Keysight N5234A/35A Service Guide...
Page 71: If Gain Adjustment
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 N5234A/35A Service Guide 3-43...
Page 72 Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B None RF Cable, 2.4 mm (f) to 2.4mm (f) 85133E 85133F 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 N5234A/35A Service Guide...
Page 73 , 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 N5234A/35A Service Guide 3-45...
Page 74: Ee Default Adjustment
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 N5234A/35A Service Guide...
Page 75: Troubleshooting
Keysight Microwave Network Analyzers 2-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 76: Chapter Four At-A-Glance
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 N5234A/35A Service Guide...
Page 77: Operating The Analyzer With Covers Removed
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 N5234A/35A Service Guide...
Page 78: 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 79 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 N5234A/35A Service Guide...
Page 80: Power Up Troubleshooting
— 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 2-7. Keysight N5234A/35A Service Guide...
Page 81: Power Supply Check
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 N5234A/35A Service Guide...
Page 82 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 N5234A/35A Service Guide...
Page 83 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 N5234A/35A Service Guide...
Page 84 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 N5234A/35A Service Guide...
Page 85 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 N5234A/35A Service Guide 4-11...
Page 86 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 N5234A/35A Service Guide...
Page 87: Troubleshooting Lcd Display Problems
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 N5234A/35A Service Guide 4-13...
Page 88: Front Panel Troubleshooting
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 N5234A/35A Service Guide...
Page 89 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 N5234A/35A Service Guide 4-15...
Page 90 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 N5234A/35A Service Guide...
Page 91: A3 Display Test
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 N5234A/35A Service Guide 4-17...
Page 92: A1 Front Panel Interface Board
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 N5234A/35A Service Guide...
Page 93: Rear Panel Troubleshooting
, 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 N5234A/35A Service Guide 4-19...
Page 94: Lan Troubleshooting
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 N5234A/35A Service Guide...
Page 95 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 N5234A/35A Service Guide 4-21...
Page 96 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 N5234A/35A Service Guide...
Page 97 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 N5234A/35A Service Guide 4-23...
Page 98 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 N5234A/35A Service Guide...
Page 99 Troubleshooting Rear Panel Troubleshooting Figure 4-6 Construction of a Crossover Cable Keysight N5234A/35A Service Guide 4-25...
Page 100: Measurement System Troubleshooting
, then , 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 2-7. 4-26 Keysight N5234A/35A Service Guide...
Page 101 , then System View EEPROM Headers . Refer to Figure 4-7. If the information is incorrect for any of the PC boards, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-7. Figure 4-7 EEPROM Header Info Dialog Window Error Messages SOURCE UNLEVELED: The source ALC circuit on the A19 test set motherboard is running open-loop.
Page 102: Verifying The A, B, And R Traces (Standard S-Parameter Mode)
There may, however, be a minor failure in the analyzer. To test further: — Go to Chapter 3, “Tests and Adjustments.” and perform all the tests in that section. 4-28 Keysight N5234A/35A Service Guide...
Page 103: Where To Begin Troubleshooting
Troubleshooting Measurement System Troubleshooting — If a problem still exists, contact Keysight. Refer to “Contacting Keysight” on page 2-7. — 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.
Page 104 Properties in the resulting pop-up menu. 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.
Page 105: Checking The Source Group
Too many sections!Equipment Used for This Check Equipment Type Model or Alternate Model or Part Number Part Number Power meter E4418B/E4419B E4418A/E4419A Power sensor, 2.4 mm E8487A None Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B None Keysight N5234A/35A Service Guide 4-31...
Page 106 5. If any of the 50 MHz signals are not present, replace the A7 frequency reference board. Refer to “Removing and Replacing the A4, A7, A9, and A10 Boards” on page 7-16. 6. If the 50 MHz signals are present, reconnect the cables, and then: 4-32 Keysight N5234A/35A Service Guide...
Page 107 6. If the signal is not present and the 50 MHz reference signal is present from “Checking the A7 50 MHz Reference Outputs,” replace the faulty synthesizer board. Refer to “Removing and Replacing the A4, A7, A9, and A10 Boards” on page 7-16. Keysight N5234A/35A Service Guide 4-33...
Page 108 3. Connect the spectrum analyzer to the open connector. Set the spectrum analyzer to measure a signal at 800 MHz CW frequency. 4. If the signal is not present, replace the A23 MASS50. Refer to “Removing and Replacing the A23 MASS50”. 4-34 Keysight N5234A/35A Service Guide...
Page 109: Checking The Signal Separation Group
Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B None 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.) Keysight N5234A/35A Service Guide 4-35...
Page 110 — A25 or A28 test port coupler Checking the A29 and A30 60 dB Step Attenuators 1. Locate the appropriate semirigid cable at the output of the source step attenuator to be checked: — Port 1; W13 of A29 4-36 Keysight N5234A/35A Service Guide...
Page 111: Checking The Receiver Group
Covers” on page 7-8. Procedures described in this document are performed with power supplied to the product while protective covers are removed. Energy available at many points may, if contacted, result in personal injury. Keysight N5234A/35A Service Guide 4-37...
Page 112 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 (MxB50)”. 4-38 Keysight N5234A/35A Service Guide...
Page 113: Instrument Block Diagram
Troubleshooting Instrument Block Diagram Instrument Block Diagram Microwave PNA, N523xA, Option 200 & 216 Keysight N5234A/35A Service Guide 4-39...
Page 114 N5234A/35A 2-Port Overall Block Diagram Includes Options 200-Standard; 216-Configurable Test Set and Source Attenuators DISPLAY USB BD Service Guide: N5235-90001 A9 SIGNAL PROCESSING A24 MIXER BRICK (MxB50) OPTION 200 IF = 0.826 MHz for CW Freq < 45 MHz ADC MODULE (SPAM) IF = 5.785 MHz for CW Freq >...
Page 115: Theory Of Operation
Keysight Microwave Network Analyzers 2-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 PNA microwave network analyzers. — Theory of operation is explained to the assembly level only.
Page 116: Chapter Five At-A-Glance
Operation of the assemblies associated with digital Digital Processing and Digital page 5-19 processing and digital control. Control Group Operation Operation of the power supply assembly group. Power Supply Group Operation page 5-24 Keysight N5234A/35A Service Guide...
Page 117: Network Analyzer System Operation
The major functional groups are: — Synthesized Source Group — Signal Separation Group — Receiver Group — Digital Processor and Digital Control Group — Power Supply Group Keysight N5234A/35A Service Guide...
Page 118 “Receiver Group Operation” on page 5-17. 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 hyperlink above. Keysight N5234A/35A Service Guide...
Page 119 “Digital Processing and Digital Control Group Operation” on page 5-19. 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 5-24. Keysight N5234A/35A Service Guide...
Page 120: Synthesized Source Group Operation
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 N5234A/35A Service Guide...
Page 121 Theory of Operation Synthesized Source Group Operation Figure 5-2 Source Group Keysight N5234A/35A Service Guide...
Page 122: A4 And A10 13.5 Ghz Synthesizer Boards
In band 6, the output of the swept VCO is passed through a divide-by-4 circuit and then sent to a Direct Digital Synthesizer to produce the output frequencies for bands 1–4 as listed in Table 5-1. Keysight N5234A/35A Service Guide...
Page 123: A7 Frequency Reference Board
— to act as an interface between the A17 CPU board and the auxiliary rear panel interconnects. — to provide ALC signals to the A23 MASS50 — to route control signals to the signal separation group. Refer to “Signal Separation Group Operation” on page 5-14 for more information. Keysight N5234A/35A Service Guide...
Page 124 +22 Vdc, 100 mA max. 15–16 SEL1–2 TTL out, test set select bits 1-2, tied to 0 V AD11 TTL I/O, address and latched data SEL3 TTL out, test set select bit 3, tied to 0 V 5-10 Keysight N5234A/35A Service Guide...
Page 125 Output Strobe TTL out, active low data write strobe (1 μs min) Write Strobe No connect Not used Pass Fail TTL out, latched, indicates pass fail (programmable polarity) +5 V +5 Vdc, 100 mA max. Keysight N5234A/35A Service Guide 5-11...
Page 126 Ground sense for Analog In and Analog Out Connected with 51.1 ohms to ACOM AnalogIn1 Analog input: ±10 V @ 1.22 mV typical resolution Rin > 1 M-ohm BW ≈ 1 MHz ADC conversion time < 1 us typical 5-12 Keysight N5234A/35A Service Guide...
Page 127: A22 Multiplier/Amplifier 26.5 Board (Hma26.5)
10 MHz to 50 GHz. This is sent to the splitter, where a portion of the signal is used for the R1 and R2 channel reference signals, and another portion for the ALC circuit of the A19 test set motherboard. Keysight N5234A/35A Service Guide 5-13...
Page 128: Signal Separation Group Operation
+30 dBm. You can make measurements in the forward, reverse, or both directions and still achieve these high power levels. 5-14 Keysight N5234A/35A Service Guide...
Page 129: A25 And A28 Test Port Couplers
The coupled arm of the couplers carries the signal reflected from or transmitted through the DUT, to the receiver for measurement (through front panel jumpers), as inputs A and B. The coupling coefficient of the directional couplers is nominally 15 dB over the full frequency range. Keysight N5234A/35A Service Guide 5-15...
Page 130: A29-A30 60 Db Step Attenuators
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. 5-16 Keysight N5234A/35A Service Guide...
Page 131: Receiver Group Operation
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 5-19 for more information on signal processing. Keysight N5234A/35A Service Guide 5-17...
Page 132 Theory of Operation Receiver Group Operation Figure 5-5 Receiver Group 5-18 Keysight N5234A/35A Service Guide...
Page 133: Digital Processing And Digital Control Group Operation
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 N5234A/35A Service Guide 5-19...
Page 134 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-6 Digital Processing and Digital Control Group 5-20 Keysight N5234A/35A Service Guide...
Page 135: Front Panel Subgroup
The video data received from the A17 CPU board includes the following: Table 5-4 • digital TTL horizontal sync • digital TTL red video • blanking • digital TTL vertical sync • digital TTL green video • data clock • digital TTL blue video Keysight N5234A/35A Service Guide 5-21...
Page 136: Data Acquisition And Processing Subgroup
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. 5-22 Keysight N5234A/35A Service Guide...
Page 137 (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 N5234A/35A Service Guide 5-23...
Page 138: Power Supply Group Operation
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. 5-24 Keysight N5234A/35A Service Guide...
Page 139: Replaceable Parts
Service Guide Replaceable Parts Information in This Chapter This chapter: — identifies the replaceable parts for the Keysight PNA series microwave network analyzer. — includes several tables and illustrations to assist you in identifying the correct part for your analyzer.
Page 140: 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 141: Assembly Replacement Sequence
Adjustments.” 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 N5234A/35A Service Guide...
Page 142: Rebuilt-Exchange Assemblies
— 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 N5234A/35A Service Guide...
Page 143 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5234A/35A Service Guide...
Page 144: Replaceable Parts Listings
Replaceable Parts Listings Replaceable Parts Listings This section contains the replacement part numbers and their descriptions for your Keysight PNA series microwave network analyzer. You can find the locations of replaceable parts in this section: — listed by reference designator in...
Page 145 “Bottom Ribbon Cables, N523xA, Option 200” on page 6-24 — “Bottom Assemblies, N523xA, Option 216” on page 6-26 — “Bottom Cables, N523xA, Option 216” on page 6-28 — “Bottom Ribbon Cables, N523xA, Option 216” on page 6-30 Keysight N5234A/35A Service Guide...
Page 146 ESD Supplies on page 6-41 — EMI/RFI Shielding Accessories on page 6-41 — Upgrade Kits and Accessories on page 6-41 — Rack Mount Kits and Handle Kits on page 6-42 — Touch-up Paint on page 6-42 Keysight N5234A/35A Service Guide...
Page 147 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5234A/35A Service Guide...
Page 148: Front Panel Assembly, Front Side, All Options
(Must be ordered separately from front frame assembly.) 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 N5234A/35A Service Guide...
Page 149 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5234A/35A Service Guide 6-11...
Page 150: Front Panel Assembly, Back Side, All Options
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.) 2190-0017 Lock washer, helical #8 (To use with 0515-0667 screw.) 6-12 Keysight N5234A/35A Service Guide...
Page 151 In March 2013, Keysight discontinued using a display with florescent tube backlighting, and began using a display with LED backlighting. Associated parts are indicated in this table with either “Tube” or “LED.” If you replace an old part number <designated “Tube”>...
Page 152 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 N5234A/35A Service Guide...
Page 153 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Keysight N5234A/35A Service Guide 6-15...
Page 154: Top Assemblies, All Models
13.5 GHz source synthesizer board Was N5242-60050 N5240-60069 Frequency reference board N5240-60077 Signal processing ADC module (SPAM) board N5240-6360056 N5240-60074 13.5 GHz LO synthesizer board Was N5242-60050 N5230-60133 System motherboard W1312-60095 Midplane board 0950-4934 Power supply assembly 6-16 Keysight N5234A/35A Service Guide...
Page 155 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Models Keysight N5234A/35A Service Guide 6-17...
Page 156: Top Cables, All Models
A4 13.5 GHz source synthesizer board J5 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wrapped cable 6-18 Keysight N5234A/35A Service Guide...
Page 157 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Models Keysight N5234A/35A Service Guide 6-19...
Page 158: Bottom Assemblies, N523Xa, Option 200
Description Designator N5230-60034 Test set motherboard 5087-7765 Multiplier/amplifier 26.5 (HMA26.5) 5087-6765 5087-7763 MASS50 (Multiplier/amplifier/switch/splitter assembly) 5087-7770 Mixer brick (MXB50) 5087-7793 Test port 1 bridge coupler Test port 2 bridge coupler N5240-60058 Front-panel LED board  6-20 Keysight N5234A/35A Service Guide...
Page 159 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, N523xA, Option 200 Keysight N5234A/35A Service Guide 6-21...
Page 160: Bottom Cables, N523Xa, Option 200
A19 test set motherboard J3 to A23 MASS50 N5235-60020 A19 test set motherboard J4 to A23 MASS50 N5235-60021 A19 test set motherboard J5 to A23 MASS50 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-22 Keysight N5234A/35A Service Guide...
Page 161 Replaceable Parts Replaceable Parts Listings Figure 6-9 Bottom Cables, N523xA, Option 200 Keysight N5234A/35A Service Guide 6-23...
Page 162: Bottom Ribbon Cables, N523Xa, Option 200
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 N5234A/35A Service Guide...
Page 163 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables, N523xA, Option 200 Keysight N5234A/35A Service Guide 6-25...
Page 164: Bottom Assemblies, N523Xa, Option 216
Mixer brick (MXB50) 5087-7793 Test port 1 bridge coupler Test port 2 bridge coupler 33325-60022 Test port 1 source 60-dB step attenuator Test port 2 source 60-dB step attenuator Was: 33325-60016 N5240-60058 Front-panel LED board  6-26 Keysight N5234A/35A Service Guide...
Page 165 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, N523xA, Option 216 Keysight N5234A/35A Service Guide 6-27...
Page 166: Bottom Cables, N523Xa, Option 216
A19 test set motherboard J3 to A23 MASS50 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wrapped cable 6-28 Keysight N5234A/35A Service Guide...
Page 167 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom Cables, N523xA, Option 216 Keysight N5234A/35A Service Guide 6-29...
Page 168: Bottom Ribbon Cables, N523Xa, Option 216
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 N5234A/35A Service Guide...
Page 169 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables, N523xA, Option 216 Keysight N5234A/35A Service Guide 6-31...
Page 170: Bottom Hardware And Miscellaneous Parts
Machine screw M3.0 x 8 pan head (to attach: angle bracket to deck side; TSMB to deck; attenuator bracket to attenuator; front plate to deck <not shown>; HMA26.5 to deck side.) 0515-1521 Machine screw M3.0 x 5 flat head (to attach LED boards to front plate) 6-32 Keysight N5234A/35A Service Guide...
Page 171 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Hardware and Miscellaneous Parts, All Options Keysight N5234A/35A Service Guide 6-33...
Page 172: Internal Hardware And Miscellaneous Parts, All Models
Solid state drive (SSD) for Windows 7 Operating System- to be used with N8984A Version 7 the 2.2 GHz CPU board W1312-60211 All prefixes – Solid state drive (SSD) for Windows 7 Operating System N8983 Version 6, & 6.1 6-34 Keysight N5234A/35A Service Guide...
Page 173 For the latest information on CPUs and associated drives, visit: https://www.keysight.com/us/en/assets/9922-01369/miscellaneous/PNA-Hard-Drives-and-CPUs.pdf. c. Versions 4 and 5 CPUs are obsolete. And, the N5242-60035, and N5242-60044 HDDA’s are no longer orderable from Keysight. Please contact Keysight to discuss options for migrating to a newer CPU and solid state drive. Refer to, “Contacting Keysight”...
Page 174 Replaceable Parts Replaceable Parts Listings Figure 6-15 Internal Hardware and Miscellaneous Parts, All Models 6-36 Keysight N5234A/35A Service Guide...
Page 175: External Hardware And Miscellaneous Parts, All Models
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 N5234A/35A Service Guide 6-37...
Page 176 Replaceable Parts Replaceable Parts Listings Figure 6-16 External Hardware and Miscellaneous Parts, All Models 6-38 Keysight N5234A/35A Service Guide...
Page 177: Rear Panel Assembly, All Models
Miscellaneous Parts, All Models” on page 6-34 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 N5234A/35A Service Guide 6-39...
Page 178: Miscellaneous Part Numbers
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. (Not available in printed form. Part number is for reference only. Must be printed N5235-90001 from the Keysight Web site.)
Page 179: Gpib Cables/Gpib Adapter
9 mm ferrite bead for parallel port 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.
Page 180: Rack Mount Kits And Handle Kits
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. 6-42 Keysight N5234A/35A Service Guide...
Page 181: Repair And Replacement Procedures
Keysight Microwave Network Analyzers 2-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 182: 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 Start Page Warnings and cautions pertaining to personal safety.
Page 183: Personal Safety Warnings
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 N5234A/35A Service Guide...
Page 184: Electrostatic Discharge (Esd) Protection
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 N5234A/35A Service Guide...
Page 185: Assembly Replacement Sequence
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 N5234A/35A Service Guide...
Page 186: Removal And Replacement Procedures
Test port 2 bridge coupler 60-dB source step attenuator page 7-32 60-dB source step attenuator Solid state drive assembly (SSDA) page 7-33 Rear panel page 7-34 Front Panel LED boards page 7-35 Fans page 7-37 Battery page 7-39 Keysight N5234A/35A Service Guide...
Page 187 Repair and Replacement Procedures Removal and Replacement Procedures This page intentionally left blank. Keysight N5234A/35A Service Guide...
Page 188: Removing The Covers
Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5234A/35A Service Guide...
Page 189 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5234A/35A Service Guide...
Page 190: Removing And Replacing The Front Panel Assembly
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 N5234A/35A Service Guide...
Page 191 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal Keysight N5234A/35A Service Guide 7-11...
Page 192: Removing And Replacing The A1-A3 And Other Front Panel Subassemblies
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. Removing the Inverter Board 7-12 Keysight N5234A/35A Service Guide...
Page 193 Removing the A3 Display Assembly and the Touchscreen 1. Disconnect the following cables from the A1 front panel interface board: display cable (item ), inverter board cable (item ), touchscreen controller board cable (item ), and power switch cable (item Keysight N5234A/35A Service Guide 7-13...
Page 194 (item ) that attach it to the LCD display hold down bracket (item ). Note the location of the four spacers (item ) before separating the LCD display from the hold down bracket. 7-14 Keysight N5234A/35A Service Guide...
Page 195 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 N5234A/35A Service Guide 7-15...
Page 196: Removing And Replacing The A4, A7, A9, And A10 Boards
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 N5234A/35A Service Guide...
Page 197 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 N5234A/35A Service Guide 7-17...
Page 198: Removing And Replacing The A14 System Motherboard
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 N5234A/35A Service Guide...
Page 199 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 N5234A/35A Service Guide 7-19...
Page 200 Repair and Replacement Procedures Removing and Replacing the A14 System Motherboard Figure 7-6 A14 System Motherboard Removal 7-20 Keysight N5234A/35A Service Guide...
Page 201: Removing And Replacing The A15 Midplane Board
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 N5234A/35A Service Guide 7-21...
Page 202 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 N5234A/35A Service Guide...
Page 203: Removing And Replacing The A16 Power Supply Assembly
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 N5234A/35A Service Guide 7-23...
Page 204: Removing And Replacing The A17 Cpu Board
“Removing and Replacing the A51 Solid State Drive (SSD)” on page 7-33. 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 N5234A/35A Service Guide...
Page 205: Removing And Replacing The A18 Gpib Board
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 N5234A/35A Service Guide 7-25...
Page 206: Removing And Replacing The A19 Test Set Motherboard
7. Slide the A19 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. Replacement Procedure 1. Reverse the order of the removal procedure. 7-26 Keysight N5234A/35A Service Guide...
Page 207 Repair and Replacement Procedures Removing and Replacing the A19 Test Set Motherboard 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 N5234A/35A Service Guide 7-27...
Page 208: Removing And Replacing The A22 Multiplier/Amplifier 26.5 (Hma26.5)
6. Remove the A22 HMA26.5 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 N5234A/35A Service Guide...
Page 209: Removing And Replacing The A23 Mass50
6. Remove the A23 MASS50 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 N5234A/35A Service Guide 7-29...
Page 210: Removing And Replacing The A24 Mixer Brick (Mxb50)
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. 7-30 Keysight N5234A/35A Service Guide...
Page 211: Removing And Replacing The A25 And A28 Test Port Bridge Couplers
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. Keysight N5234A/35A Service Guide 7-31...
Page 212: Removing And Replacing The A29 And A30 60-Db Source Step Attenuators
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. 7-32 Keysight N5234A/35A Service Guide...
Page 213: Removing And Replacing The A51 Solid State Drive (Ssd)
Copy Unique Files from the SSD If installing an SSD for Windows XP: if the user has loaded unique calibration kit information, navigate to C:\Program Files\Keysight\Network Analyzer and copy USER_CALKITFILE to a USB flash memory drive. Also copy any personal user files that you wish to preserve.
Page 214: Removing And Replacing The Rear Panel
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 N5234A/35A Service Guide...
Page 215: Removing And Replacing The Front Panel Led Boards
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 N5234A/35A Service Guide 7-35...
Page 216 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards This page intentionally left blank. 7-36 Keysight N5234A/35A Service Guide...
Page 217: 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 7-41. Keysight N5234A/35A Service Guide 7-37...
Page 218 Repair and Replacement Procedures Removing and Replacing the Fans Figure 7-7 Fan Removal 7-38 Keysight N5234A/35A Service Guide...
Page 219: Removing And Replacing The Lithium Battery
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 N5234A/35A Service Guide 7-39...
Page 220 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-8 Lithium Battery Removal 7-40 Keysight N5234A/35A Service Guide...
Page 221: Post-Repair Procedures
“Repairing and Recovering Option Data” Chapter A14 system motherboard No adjustment needed Front Panel Keypad and RPG Test A3 Display Test Chapter 4 The Operator’s Check A17 CPU board No adjustment needed The Operator’s Check Keysight N5234A/35A Service Guide 7-41...
Page 222 Calibration Coefficients Test Receiver Adjustment IF Response Adjustment (Option 090, 093, or 094 Only) A51 solid state drive assembly Restore previously saved receiver Read and write to the drive (SSDA) calibration data (or perform Receiver Adjustment) 7-42 Keysight N5234A/35A Service Guide...
Page 223: Resetting The Mechanical Counter
None a. This adjustment is intended for Keysight personnel only and requires a password to run. b. If a backup copy of receiver calibration data from the faulty disk drive is available, it can be copied to the new disk drive. If...
Page 224: Eeprom Backup
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 N5234A/35A Service Guide...
Page 225 Repair and Replacement Procedures Post-Repair Procedures To store the backup data, perform these steps: — Navigate to the EEPROM Backup Utility, located at: — Windows 7 -- C:\Program Files (x86)\Keysight\Network Analyzer\Service\eebackup.exe — Windows 10 -- C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program.
Page 226 Repair and Replacement Procedures Post-Repair Procedures 7-46 Keysight N5234A/35A Service Guide...
Page 227: General Purpose Maintenance Procedures
Keysight Microwave Network Analyzers 2-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 How to use error terms as a preventive maintenance and Error Terms page 8-2 troubleshooting tool.
Page 228: Error Terms
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 8-6. Keysight N5234A/35A Service Guide...
Page 229: Performing Measurement Calibration
8-1, and Figure 8-2 illustrate the error terms associated with measurement calibration for 1-port and 2-port configurations respectively. Figure 8-1 Flowgraph of One-Port Error Terms for Port 1 where: E = Error term Subscript: D = Directivity Keysight N5234A/35A Service Guide...
Page 230: Accessing Error Terms
T = Transmission Tracking 2nd Subscript: F = forward measurement (Port 1 to Port 2) R = reverse measurement (Port 2 to Port 1) Accessing Error Terms Error terms can be accessed either manually or programmatically: Keysight N5234A/35A Service Guide...
Page 231 For more information on GPIB and SCPI, refer to the embedded help in the analyzer. Type in keyword “errors, systematic” in the index. COM/DCOM Access to Error Terms You can access error terms by way of Component Object Model (COM) or Distributed Component Object Model (DCOM) software architecture. Keysight N5234A/35A Service Guide...
Page 232: Error Term Data
25 °C ±5 °C, with less than 1 °C deviation from the calibration temperature. b. All crosstalk values are typical. If Error Terms Seem Worse than Expected To verify that the system still conforms to specifications, perform a system verification. Refer to Chapter 3, “Tests and Adjustments.”. Keysight N5234A/35A Service Guide...
Page 233 2-port device. The match of test port cables is included in this response. Load match error terms are characterized by measuring the S and S responses of a “thru” configuration during the calibration procedure. Keysight N5234A/35A Service Guide...
Page 234 (including the A or B input) while measuring transmission. The response of the test port cables is included. These terms are characterized by measuring the transmission (S ) of the “thru” configuration during the measurement calibration. Keysight N5234A/35A Service Guide...
Page 235 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 4-37 or to “Checking the Signal Separation Group” on page 4-35. Keysight N5234A/35A Service Guide...
Page 236: Option Enable Utility
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 8-11. 8-10 Keysight N5234A/35A Service Guide...
Page 237: Enabling Or Removing Options
HostID number of the PNA. This HostID number is NOT the one currently shown on the PNA. To determine your new HostID, Keysight personnel should use the new model number with the utility at go http://mktwww.srs.is.keysight.com/field/service/network/pna/upgrades.
Page 238: Repairing And Recovering Option Data
If the data stored in either of these items is lost, it can be recovered from the other item. If the data on both the hard disk drive and the frequency reference board is lost, it can not be recovered. Contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-7.
Page 239: Installing Or Changing A Serial Number
On the System menu, point to Service, and then click Option Enable, or b. On the Help menu, click About Network Analyzer. 6. If the options are still not listed correctly, contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-7.
Page 240: Firmware Upgrades
Recovering from Hard Disk Drive Problems If you suspect that you have a hard disk drive problem, go to the “Hard Drive 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/...
Page 241: Storing Correction Constants
— 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. Keysight N5234A/35A Service Guide 8-15...
Page 242 General Purpose Maintenance Procedures Correction Constants 8-16 Keysight N5234A/35A Service Guide...
Page 243 4-34 5-16 removal and replacement A23 MASS50 part number 6-26 procedure 7-18 illustrated removal and replacement , 6-21, 6-27 A15 midplane board part number procedure 6-20 7-32 illustrated 6-17 removal and replacement troubleshooting 4-36 Keysight N5234A/35A Service Guide...
Page 244 6-37 IF gain 3-43 interconnects internal performance test , 5-9, 5-10, IF response 3-46 software 3-31 5-23 receiver calibration 3-43 internal replaceable parts replaceable parts, source calibration 3-42 illustrated 6-36 illustrated synthesizer bandwidth 6-40 3-42 Keysight N5234A/35A Service Guide...
Page 245 5-16 illustrated 6-29 bottom assembly, option 200 3-15 required for servicing replaceable assemblies 6-20 test port cables , 3-12, RF, See Bottom illustrated 6-21 3-14 Assembly, Option xxx replaceable cables 6-22 operator’s 3-12 Keysight N5234A/35A Service Guide...
Page 246 6-41 GPIB 5-23 group enabling HANDLER I/O , 5-10, 5-11 synthesized source options 8-11 PWR I/O 5-12 group entitlement certificate, TEST SET I/O 5-10 digital control group option 8-10 Keysight N5234A/35A Service Guide...
Page 247 REF OUT connector subassemblies, removal and part number 6-10 rear panel replacement front panel external analyzer illustrated 7-13 assembly replaceable parts procedures illustrated 7-12 6-11 illustrated 6-38 subgroup part numbers 5-19 , 6-10, 6-12 part numbers 6-37 Keysight N5234A/35A Service Guide...
Page 248 3-17 illustrated 7-13 part numbers test port cables 6-34 3-15 procedure 7-12 ground, safety earth installing test groups a serial number 4-15 8-13 troubleshooting functional instrument 4-14 Keysight specifications Keysight N5234A/35A Service Guide...
Page 249 5-22 cause of failure monitor, external receiver group 4-13 5-17 definition of motherboard, system, See signal separation group 5-14 measurements affected solid state drive 5-23 A14 system , 8-7, source group motherboard Keysight N5234A/35A Service Guide...
Page 250 , 6-10, 6-11 test port cables 3-17 part numbers 6-40 pin assignments PWR I/O connectors connector HANDLER I/O pads 5-11 pin assignments 5-12 PWR I/O required for servicing 5-12 paint ping touch-up command, LAN 4-21 Keysight N5234A/35A Service Guide...
Page 251 5-18 failure of 3-15 static safety parts operation 5-17 test port cables 3-14 part numbers 6-41 troubleshooting RFI/EMI 4-37 required linearity supplies test equipment dynamic accuracy part numbers 6-41 required test 3-39 tools Keysight N5234A/35A Service Guide...
Page 252 3-42 accessories used troubleshooting 4-14 synthesizer specifications 3-14 bandwidth 3-42 instrument connector checks stabilization, warm up repeatability getting ready time operating system connector repeatability recovery 8-14 stabilization failure 3-20 specifications warm up time magnitude and phase Keysight N5234A/35A Service Guide...
Page 253 GPIB CONTROLLER port 4-19 parts list 6-12 kits, part numbers 6-41 inverter board 4-13 removal and replacement 4-20 illustrated , 7-14, 7-15 accessories MASS50 4-34 procedure part numbers 7-13 6-41 measurement system 4-26 touch-up board Keysight N5234A/35A Service Guide...
Page 254 , 3-1, 3-8, 3-21 dialog box 3-25 example of results , 3-28, 3-30 failure flowchart 3-27 failure of 3-26 getting ready interpreting results 3-27 performing 3-23 procedure 3-25 what it verifies 3-21 monitor 4-13 Keysight N5234A/35A Service Guide...
Page 255 Installation Note Xxxxx-xxxxx...
Page 256 This information is subject to change without notice. © Keysight Technologies 2011-2023 Edition 1, March 2023 N5235-90001 www.keysight.com...

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