Page 1 N5224/5B 2-Port and 4-Port PNA Microwave Network Analyzers - Service Guide N5224/5B Series - (900 Hz /10 MHz - 43.5 GHz) (900 Hz /10 MHz - 50 GHz) This is the Service Guide for the N5224/5B Series Microwave Network Analyzers. Service Guide...
Page 2 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 COVERING THE MATERIAL IN THIS...
Page 5: Table Of Contents
Keysight Support, Services, and Assistance ........
Page 6 Information in This Chapter ........... 4-1 Keysight N5224B/25B Service Guide...
Page 7 Instrument Block Diagrams – 2-Port (Sheet 2), LFE and Non-DDS (Version 6 Synthesizers) . . 4-64 Microwave PNA, N5224/5B – 2-Port (LFE & Version 6 Synthesizers), LFE and Non-DDS . 4-64 Instrument Block Diagrams – 2-Port (Sheet 3), Non-LFE and DDS (Version 7 Synthesizer Keysight N5224B/25B Service Guide...
Page 8 Configurable Test Set ........... 5-41 Keysight N5224B/25B Service Guide...
Page 9 Information in This Chapter ..........7-2 Keysight N5224B/25B Service Guide...
Page 10 EEPROM Backup ............7-86 General Purpose Maintenance Procedures Keysight N5224B/25B Service Guide...
Page 11 Accessing the Keysight License Manager ........
Page 12 Contents Keysight N5224B/25B Service Guide...
Page 13: Safety And Regulatory Information
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Safety and Regulatory Information Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer. It also contains information that is required by various government regulatory agencies.
Page 14: 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 N5224B/25B Service Guide...
Page 15: 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 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 N5224B/25B Service Guide...
Page 17: Servicing
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 18 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5224B/25B Service Guide...
Page 19: 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 “Miscellaneous Part Numbers” on page 6-284 for part numbers. Keysight N5224B/25B Service Guide...
Page 20 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5224B/25B Service Guide...
Page 21: Regulatory Information
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 N5224B/25B Service Guide...
Page 22 The UK conformity mark is a UK government owned mark. Products showing this mark comply with all applicable UK regulations. The Keysight email address is required by EU directives applicable to our product. The CSA mark is a registered trademark of the CSA International.
Page 23 National legislation. Please refer to www.keysight.com/go/takeback to understand your trade-in options with Keysight, in addition to product takeback instructions. China Restricted Substance Product Label. The EPUP (environmental protection use period) number in the center indicates the time period during which no hazardous or toxic substances or elements are expected to leak or deteriorate during normal use and generally reflects the expected useful life of the product.
Page 24: Lithium Battery Disposal
If the battery on the A21 CPU board assembly needs to be disposed of, dispose of it in accordance with your country’s requirements. If required, you may return the battery to Keysight Technologies for disposal. Refer to “Contacting Keysight” on page 2-7 for assistance.
Page 25: General Product Information
Keysight Support, Services, and The Internet address (URL) for on-line assistance. page 2-7 Assistance Service and support options available. Calibration options available. Important information about shipping your analyzer to Keysight for service or repair.
Page 26: Maintenance
Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally. Electrical Maintenance Refer to “Review the Principles of Connector Care” on page 3-5. Keysight N5224B/25B Service Guide...
Page 27: 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, including ordering information, refer to the Keysight PNA Family Microwave Network Analyzers Configuration Guide, available online at https://www.keysight.com/us/en/assets/7018-05185/configuration-guides/ 5992-1465.pdf...
Page 28: 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 opera- tion 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 N5224B/25B Service Guide...
Page 29 Model Number Number Tools T-8 TORX driver 0.6 N-m (5 in-lb) setting T-10 TORX driver 0.5, 0.8, and 1.0 N-m (4, 7, and 9 in-lb) settings T-15 TORX driver 1.5 N-m (14 in-lb) setting T, R Keysight N5224B/25B Service Guide...
Page 30 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 N5224B/25B Service Guide...
Page 31: Keysight Support, Services, And Assistance
Service and Support Options The analyzer’s standard warranty period is one year from the time of initial delivery. All repairs require the analyzer to be shipped to the nearest Keysight Technologies service center. Extended warranty periods can be purchased with the initial product purchase.
Page 32: Shipping Your Analyzer To Keysight For Service Or Repair
General Product Information Keysight Support, Services, and Assistance 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. With this information, the Keysight representative can determine whether your product is still within its warranty period.
Page 33: Tests And Adjustments
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Tests and Adjustments Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your PNA. — The checks verify the operation of the assemblies in your analyzer.
Page 34 Noise Floor Test — Calibration Coefficients Test — Dynamic Accuracy Test — Dynamic Accuracy at Low Frequency (Available with LFE Option 205/220/420/425) — DC Continuity Test the LFE Board and Test Ports (Available with LFE Option 205/220/420/425) Keysight N5224B/25B Service Guide...
Page 35 LFE Receiver Adjustment – (Available with Option 205, 220, 405, 420, and 425) a. These performance tests are included in the analyzer’s firmware for Options S93898A. b. These adjustments are included in the analyzer’s firmware on all models and options. Keysight N5224B/25B Service Guide...
Page 36: 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 N5224B/25B Service Guide...
Page 37: Allow The Analyzer To Warm Up
Prior to making connections to your analyzer, carefully review the information about inspecting, cleaning, and gaging connectors. Refer to the calibration kit documentation for detailed connector care information. For course numbers about additional connector care instruction, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-7. Table 3-1...
Page 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 N5224B/25B Service Guide...
Page 39: 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 N5224B/25B Service Guide...
Page 40: 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 N5224B/25B Service Guide...
Page 41: 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 42: 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 N5224B/25B Service Guide...
Page 43: 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 N5224B/25B Service Guide 3-11...
Page 44: 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 N5224B/25B 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 N5224B/25B Service Guide 3-13...
Page 46: The Test Port Cable Checks
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 N5224B/25B 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 N5224B/25B 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 N5224B/25B 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 N5224B/25B 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 N5224B/25B 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 N5224B/25B 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 N5224B/25B Service Guide...
Page 53: 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 N5224B/25B Service Guide 3-21...
Page 54: Measurement Traceability
This is accomplished by measuring the devices in an Keysight verification kit. The measurement of the devices in the verification kit has a traceable path...
Page 55: 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 N5224B/25B Service Guide 3-23...
Page 56 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 N5224B/25B Service Guide...
Page 57 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 58 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 59 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 N5224B/25B Service Guide 3-27...
Page 60 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 N5224B/25B 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 N5224B/25B Service Guide 3-29...
Page 62 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5224B/25B Service Guide...
Page 63: Performance Tests
1. The analyzer is Preset. 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. Keysight N5224B/25B Service Guide 3-31...
Page 64: Source Maximum Power Output Test
+18 dBm without any error, the power is left at this level. 7. The power level at this point is measured and compared to the maximum output power specification. 3-32 Keysight N5224B/25B Service Guide...
Page 65: Source Power Linearity Test
7. This power linearity measurement is repeated at several CW frequencies across the full frequency range of the analyzer. If the Analyzer Fails this Test: — Perform the “Source Adjustment” on page 3-46 and repeat this test. Keysight N5224B/25B Service Guide 3-33...
Page 66: Frequency Accuracy Test
“Touchscreen Adjustment and Verification” on page 3-44 and then repeat this test. Trace Noise Test Function of the Test: To measure the stability of a signal in the internal source and receiver system of your analyzer. 3-34 Keysight N5224B/25B Service Guide...
Page 67: 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 Keysight N5224B/25B Service Guide 3-35...
Page 68 12.The first test set output attenuator is set to 0 dB. 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: 3-36 Keysight N5224B/25B Service Guide...
Page 69: Noise State Calibration Coefficients
5. For hundreds of frequencies across the analyzer’s full range, a source power calibration is performed to ensure a flat power response at the end of the cable at the Preset power level. Keysight N5224B/25B Service Guide 3-37...
Page 70: Calibration Coefficients Test
2. A calibration is performed between the end of the test cable and Port 2. The Port 2 directivity and source match and the S21 load match are retrieved from the analyzer. 3. The test cable is moved to Port 2. 3-38 Keysight N5224B/25B Service Guide...
Page 71: Dynamic Accuracy Test
RF turned off, the PNA source power is adjusted until the power sensor reads -20 dBm. The PNA source is then turned off, the signal generator RF is turned on, and the signal generator power is adjusted until the power sensor reads -20 dBm. Keysight N5224B/25B Service Guide 3-39...
Page 72: Dynamic Accuracy At Low Frequency (Available With Lfe Option 205/220/420/425)
Specification Tested: Dynamic Accuracy at Low Frequency Equipment Used: — Function generator (33622A) — Power splitter (11667B) — Fixed attenuator (10dB x2) – (8493C Option 010) 1. Your model PNA may not have available all of the LFE Options listed. 3-40 Keysight N5224B/25B Service Guide...
Page 73 — If the analyzer fails this test repeatedly, run the DC continuity test. Refer to “DC Continuity Test the LFE Board and Test Ports (Available with LFE Option 205/220/420/425)” on page 3-43 and to “Removing and Replacing the A70 or A75 Low Frequency Extension (LFE) Board” on page 7-59. Keysight N5224B/25B Service Guide 3-41...
Page 74 “Removing and Replacing the A27 and A28 Mixer Bricks” on page 7-43. — If the analyzer still fails this test, replace the A12 SPAM board and repeat this test. Refer to “Removing and Replacing the A4–A17 Boards” on page 7-19. 3-42 Keysight N5224B/25B Service Guide...
Page 75: Dc Continuity Test The Lfe Board And Test Ports (Available With Lfe Option 205/220/420/425)
RF flexible cables installed in Chapter 6 in the “Bottom Assemblies” section—for your LFE option—are connected correctly and not open or shorted. 1. Your model PNA may not have all of the LFE Options listed. Keysight N5224B/25B Service Guide 3-43...
Page 76: Adjustments
Step 1. Verify your instrument is powered up. Step 2. Press Instrument > Display > Display Setup > Calibrate Touchscreen... Step 3. In the Table PC Setting window that opens, press Calibrate... Step 4. When the User Account Control opens, press Yes. 3-44 Keysight N5224B/25B Service Guide...
Page 77: 10 Mhz Frequency Reference Adjustment
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 3-15. Connect a GPIB cable between the network analyzer and the frequency counter. Keysight N5224B/25B Service Guide 3-45...
Page 78: 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 None Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007 3-46 Keysight N5224B/25B Service Guide...
Page 79: If Gain Adjustment
2. Follow the instructions and prompts as they are displayed. Receiver Characterization This characterizes the receivers in your analyzer. Procedure Service Adjustment Routines 1. Press UTILITY System , then , then , then click Receiver Characterization. Keysight N5224B/25B Service Guide 3-47...
Page 80: Receiver Adjustment
Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007 RF Cable, 2.4 mm (f) to 2.4mm (f) 85133C 85133E Procedure 1. Connect the equipment as shown in Figure 3-17. Connect a GPIB cable between the network analyzer and the power meter. 3-48 Keysight N5224B/25B Service Guide...
Page 81 , then , then , then click Receiver Adjustment. 3. Ensure the GPIB settings are correct. 4. Follow the instructions and prompts as they are displayed. Figure 3-18 Equipment Setup 2 for the Receiver Adjustment Keysight N5224B/25B Service Guide 3-49...
Page 82: Ee Default Adjustment
Procedure Service Adjustment Routines 1. Press UUTILITY , then , then , then System click IF Response Adjustment. 2. Follow the instructions and prompts as they are displayed. 3-50 Keysight N5224B/25B Service Guide...
Page 83: Lfe Receiver Adjustment - (Available With Option 205, 220, 405, 420, And 425)
, then , then , then System click LFE Receiver Adjustment. 2. Follow the instructions and prompts as they are displayed. 1. Your model PNA may not have available all of the LFE Options listed. Keysight N5224B/25B Service Guide 3-51...
Page 84 Tests and Adjustments Adjustments 3-52 Keysight N5224B/25B Service Guide...
Page 85: Troubleshooting
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Troubleshooting Information in This Chapter The information in this chapter helps you: — Identify the portion of the analyzer at fault. — Locate the specific troubleshooting procedure to identify the assembly or peripheral at fault.
Page 86: Chapter Four At-A-Glance
Problems with the measurement portion of the analyzer. page 4-31 Troubleshooting — Checking the A, B, R1, and R2 signals. — Checking the source group. — Checking the signal separation group. — Checking the receiver group. Keysight N5224B/25B Service Guide...
Page 87: Conventions Used For Hardkeys, Softkeys, And Menu Items
Conventions Used for Hardkeys, Softkeys, and Menu Items The following conventions are used in this document: This represents a “hardkey”, a key that is physically located on the instrument. Hardkey This represents a “tab”, whose label is determined by the instrument firmware. Keysight N5224B/25B Service Guide...
Page 88 Troubleshooting Information in This Chapter 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 N5224B/25B Service Guide...
Page 89: Operating The Analyzer With Covers Removed
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 N5224B/25B Service Guide...
Page 90: Assembly Replacement Sequence
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 N5224B/25B Service Guide...
Page 91: 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 92 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 N5224B/25B Service Guide...
Page 93: Power Up Troubleshooting
“Troubleshooting LCD Display Problems” on page 4-15. — If the instrument appears to abort the network analyzer measurement interface process, contact Keysight. Refer to “Contacting Keysight” on page 2-7. Keysight N5224B/25B Service Guide...
Page 94: 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 A19 midplane board. Refer to Table 4-2 on page 4-12 for the correct voltages. 4-10 Keysight N5224B/25B Service Guide...
Page 95 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 N5224B/25B Service Guide 4-11...
Page 96 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). 4-12 Keysight N5224B/25B Service Guide...
Page 97 To further isolate the failure in the three remaining assemblies, measure the resistance (with the power turned off) from the power supply test points to either ACOM or DCOM. Make sure that the only assemblies plugged in are the four minimum required assemblies listed above. Keysight N5224B/25B Service Guide 4-13...
Page 98 A18 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. 4-14 Keysight N5224B/25B Service Guide...
Page 99: Troubleshooting Lcd Display Problems
There are no front panel adjustments for intensity and contrast of the LCD. 1. If the display is dim, the A3 display assembly is defective. Refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-11. Keysight N5224B/25B Service Guide 4-15...
Page 100 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 4-16 Keysight N5224B/25B Service Guide...
Page 101: Front Panel Troubleshooting
Diagnostics Press UTILITY , then , then , then Service System Front Panel Test A Front Panel Key Test Utility dialog box will be displayed, as shown in Figure 4-4. Keysight N5224B/25B Service Guide 4-17...
Page 102 7-12. To replace the A1 front panel interface board, refer to “Removing the A1 Front Panel Interface Board and Keypad Assembly” on page 7-11. — To close the Key Label window and return to the instrument display, press Preset three times. 4-18 Keysight N5224B/25B Service Guide...
Page 103 Scale Save/Recall ← Math → Macro Avg BW Undo ↓ System Help Marker Search Preset a. There are no Entry or Navigation labels on the display. Entry and Navigation titles are for functional reference only. Keysight N5224B/25B Service Guide 4-19...
Page 104: A3 Display Test
If the display is dark, refer to “Removing the A3 Display Assembly and the Touchscreen” on page 7-13 and to “Removing the Touchscreen Controller Board” on page 7-12. 4-20 Keysight N5224B/25B Service Guide...
Page 105: Checking The A2 Usb Board
USB device. 3. If the device performs correctly, the USB board is functioning properly. Else, skip to step 5. 4. Repeat steps thru for all front and rear USB ports. Keysight N5224B/25B Service Guide 4-21...
Page 106: A1 Front Panel Interface Board
A1 Front Panel Interface Board and Keypad Assembly” on page 7-11 and to “Removing the Speaker Assembly” on page 7-13. Checking the Operation of the Key Pad Commands To verify the key pad functionality, refer to “Front Panel Keypad and RPG Test” on page 4-17. 4-22 Keysight N5224B/25B Service Guide...
Page 107 Troubleshooting Front Panel Troubleshooting Checking the Display To verify the display functionality, refer to “A3 Display Test” on page 4-20. Keysight N5224B/25B Service Guide 4-23...
Page 108: 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. 4-24 Keysight N5224B/25B Service Guide...
Page 109: 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. Keysight N5224B/25B Service Guide 4-25...
Page 110 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. 4-26 Keysight N5224B/25B Service Guide...
Page 111 . Then press ENTRY Enter on the front 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. Keysight N5224B/25B Service Guide 4-27...
Page 112 If possible, eliminate the possibility of a defective analyzer by substitution of a known working unit. Once the analyzer has been proven to be working properly, concentration can be placed on the network itself to determine the cause of the failure. 4-28 Keysight N5224B/25B Service Guide...
Page 113 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. Keysight N5224B/25B Service Guide 4-29...
Page 114 Troubleshooting Rear Panel Troubleshooting Figure 4-6 Construction of a Crossover Cable 4-30 Keysight N5224B/25B Service Guide...
Page 115: Measurement System Troubleshooting
, 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. Keysight N5224B/25B Service Guide...
Page 116: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)
, 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 A23 test set motherboard is running open-loop.
Page 117 — For 4-port analyzer models, traces A, B, C, D, and R1, R2, R3, and R4 are displayed in eight 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. Keysight N5224B/25B Service Guide 4-33...
Page 118: Where To Begin Troubleshooting
— Go to Chapter 3, “Tests and Adjustments.” and perform all the tests in that section. — 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...
Page 119 However, a missing or disabled DSP driver may exhibit the same or similar symptoms. To verify that this DSP driver is present and enabled: 1. A26 splitter only applies to PNA models with serial number prefix <6021. Keysight N5224B/25B Service Guide 4-35...
Page 120 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 121: Checking The Source Group
Equipment Used for This Checks 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 85056-60007 Keysight N5224B/25B Service Guide 4-37...
Page 122 5. If any of the 50 MHz signals are not present, replace the A14 frequency reference board. Refer to “Removing and Replacing the A4–A17 Boards” on page 7-19. 6. If the 50 MHz signals are present, reconnect the cables, and then: 4-38 Keysight N5224B/25B Service Guide...
Page 123 If the instrument still has a similar “Slug” failure then the DDS is faulty and needs to be replaced. If the DDS assembly is faulty, contact Keysight Technologies for help. Refer to “Contacting Keysight” on page 2-7. The A15 direct digital synthesizer assembly only applies to PNAs with serial number...
Page 124 Troubleshooting Measurement System Troubleshooting Figure 4-10 Example of Power On Self Test Error 4-40 Keysight N5224B/25B Service Guide...
Page 125 DSP version 4.0, an 807.61 MHz signal should be present. For analyzers with DSP version 5.0, an 807.44 MHz signal should be present. 1. A15 13.5 GHz LO Synthesizer board only applies to instruments with serial number prefixes <6021. Keysight N5224B/25B Service Guide 4-41...
Page 126 For analyzers with DSP version 4.0, the signal is 7.61 MHz above the network analyzer setting. For analyzers with DSP version 5.0, the signal is 7.44 MHz above the network analyzer setting. 4-42 Keysight N5224B/25B Service Guide...
Page 127 The new N5240-60101 HMA26.5 has the splitter integrated into the assembly and uses an N5222-20126 cable. Refer to Figure 4-12 on page 44. See also Chapter 6, “Replaceable Parts.” and the “Bottom Assemblies and Cables” section for your configuration and serial number prefix. Keysight N5224B/25B Service Guide 4-43...
Page 128 7.44 MHz above the network analyzer setting. 6. If the signal is not present but the signal from “Checking the A25 HMA26.5 Output,” is present, replace the A26 splitter. Refer to “Removing and Replacing the A26 Splitter” on page 7-41. 4-44 Keysight N5224B/25B Service Guide...
Page 129 3. Connect the spectrum analyzer to the open connector at the end of the cable that connects to the source board to be checked. A4 and A17 synthesizer boards only applies to PNAs with serial number prefixes <6021. Keysight N5224B/25B Service Guide 4-45...
Page 130 Refer to “Removing and Replacing the A4–A17 Boards” on page 7-19. 7. If the signal is present, reconnect all cables, and then continue with “Checking the Signal Separation Group” on page 4-47. 4-46 Keysight N5224B/25B Service Guide...
Page 131: Checking The Signal Separation Group
Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter. 1. Turn off the analyzer power. 2. Unplug the power to the analyzer and disconnect all front and rear panel connections except installed jumpers. Keysight N5224B/25B Service Guide 4-47...
Page 132 , then Utilities Receiver Display , then 3. Set the sweep speed for a 10 second sweep: Press STIMULUS Sweep Sweep Time then . Set the time to 10.000 seconds in the Sweep Time box. 4-48 Keysight N5224B/25B Service Guide...
Page 133 “Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4), S/N Prefix <6021” on page 6-186 — “4-Port Configuration, Option 420, S/N Prefix <6021” on page 6-192 — “Bottom RF Cables, 4-Port, Option 420 (Ports 1 and 2), S/N Prefix <6021” on page 6-195 Keysight N5224B/25B Service Guide 4-49...
Page 134 — Port 1; W81 of A29 — Port 2; W93 of A32 — Port 3; W85 of A30 — Port 4; W89 of A31 2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the receiver coupler. 4-50 Keysight N5224B/25B Service Guide...
Page 135 “Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators” on page 7-52. Checking the A70–A74 Bias Combiners Refer to “Checking the A70/A75 Low Frequency Extension (LFE) Board and the Bias Combiners” on page 4-47. Keysight N5224B/25B Service Guide 4-51...
Page 136: Checking The Receiver Group
Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter. 1. Turn off the analyzer power. 2. Unplug the power to the analyzer and disconnect all front and rear panel connections except installed jumpers. 4-52 Keysight N5224B/25B Service Guide...
Page 137 4. Refer to Note on page 4-31. The measured signal on the spectrum analyzer should be at 7.61 MHz (analyzers with DSP version 4.0), or 7.44 MHz (analyzers with DSP version 5.0), and 1 GHz. Keysight N5224B/25B Service Guide 4-53...
Page 138 A46–A49 Receiver Attenuators” on page 7-52. 5. If the 800 MHz signal is present, replace the associated mixer brick, A27 or A28. Refer to “Removing and Replacing the A27 and A28 Mixer Bricks” on page 7-43. 4-54 Keysight N5224B/25B Service Guide...
Page 139 “Removing and Replacing the A4–A17 Boards” on page 7-19. 6. If the measured signal is not present, replace the A24 IF multiplexer board. Refer to “Removing and Replacing the A24 IF Multiplexer Board” on page 7-36. Keysight N5224B/25B Service Guide 4-55...
Page 140: Instrument Simplified Block Diagrams - Lfe
2-Port N5290A System Block Diagram (201 and 205) Figure 4-14 System Block Diagram Legend Figure 4-15 2-Port N5290A System Simplified Block Diagram (201 and 205) 1. Your model PNA may not have available all of the LFE Options listed. 4-56 Keysight N5224B/25B Service Guide...
Page 141: 2-Port N5290A System Block Diagram (202 And 205)
Troubleshooting Instrument Simplified Block Diagrams – LFE 2-Port N5290A System Block Diagram (202 and 205) Figure 4-16 2-Port N5290A System Simplified Block Diagram (202 and 205) Keysight N5224B/25B Service Guide 4-57...
Page 142: 4-Port N5290A System Block Diagram (401)
Troubleshooting Instrument Simplified Block Diagrams – LFE 4-Port N5290A System Block Diagram (401) Figure 4-17 4-Port N5290A System Simplified Block Diagram (401) 4-58 Keysight N5224B/25B Service Guide...
Page 143 Troubleshooting Instrument Simplified Block Diagrams – LFE Figure 4-18 4-Port N5290A System Simplified Block Diagram (402) Keysight N5224B/25B Service Guide 4-59...
Page 144 Troubleshooting Instrument Simplified Block Diagrams – LFE Figure 4-19 4-Port N5290A System Simplified Block Diagram (403) 4-60 Keysight N5224B/25B Service Guide...
Page 145 Troubleshooting This page intentionally left blank. Keysight N5224B/25B Service Guide 4-61...
Page 146: Instrument Block Diagrams - 2-Port (Sheet 1), Non-Lfe And Non-Dds (Version 6
Instrument Block Diagrams – 2-Port (Sheet 1), Non-LFE and Non-DDS (Version 6 Synthesizers) Instrument Block Diagrams – 2-Port (Sheet 1), Non-LFE and Non-DDS (Version 6 Synthesizers) Microwave PNA, N5224/5B – 2-Port (Version 6 Synthesizers), Non-LFE and Non-DDS 4-62 Keysight N5224B/25B Service Guide...
Page 147 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 2-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 200-Standard; 201-Configurable Test Set; A24 IF MULTIPLEXER A27 MIXER BRICK (1) OPTION 200 OR 210 217-Attenuators; and 219-Attenuators and Bias Tees IF = 0.826 MHz for CW Freq <...
Page 148: Instrument Block Diagrams - 4-Port (Sheet 5), Non-Lfe And Non-Dds
Instrument Block Diagrams – 2-Port (Sheet 2), LFE and Non-DDS (Version 6 Synthesizers) Instrument Block Diagrams – 2-Port (Sheet 2), LFE and Non-DDS (Version 6 Synthesizers) Microwave PNA, N5224/5B – 2-Port (LFE & Version 6 Synthesizers), LFE and Non-DDS 4-64 Keysight N5224B/25B Service Guide...
Page 149 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 2-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 205-Configurable Test Set and LFE; 220-Attenuators, Bias Tees, and LFE A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq >...
Page 150 Instrument Block Diagrams – 2-Port (Sheet 3), Non-LFE and DDS (Version 7 Synthesizer Assemblies) Instrument Block Diagrams – 2-Port (Sheet 3), Non-LFE and DDS (Version 7 Synthesizer Assemblies) Microwave PNA, N5224/5B – 2-Port (Version 7 Synthesizer Assembly) Non-LFE and DDS 4-66 Keysight N5224B/25B Service Guide...
Page 151 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 2-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 200-Standard; 201-Configurable Test Set; A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz 217-Attenuators;...
Page 152 Instrument Block Diagrams – 2-Port (Sheet 4), LFE and DDS (Version 7 Synthesizer Assemblies) Instrument Block Diagrams – 2-Port (Sheet 4), LFE and DDS (Version 7 Synthesizer Assemblies) Microwave PNA, N5224/5B – 2-Port (LFE & Version 7 Synthesizer Assembly), LFE and DDS 4-68 Keysight N5224B/25B Service Guide...
Page 153 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 2-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 205-Configurable Test Set and LFE; 220-Attenuators, Bias Tees, and LFE A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq >...
Page 154 Instrument Block Diagrams – 4-Port (Sheet 5), Non-LFE and Non-DDS (Version 6 Synthesizers) Instrument Block Diagrams – 4-Port (Sheet 5), Non-LFE and Non-DDS (Version 6 Synthesizers) Microwave PNA, N5224/5B – 4-Port (Version 6 Synthesizers), Non-LFE and Non-DDS 4-70 Keysight N5224B/25B Service Guide...
Page 155 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 4-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 400-Standard; 401-Configurable Test Set; A24 IF MULTIPLEXER A27 MIXER BRICK (1) OPTION 400 OR 410 417-Attenuators; and 419-Attenuators and Bias Tees IF = 0.826 MHz for CW Freq <...
Page 156 Instrument Block Diagrams – 4-Port (Sheet 6), LFE and Non-DDS (Version 6 Synthesizers) Instrument Block Diagrams – 4-Port (Sheet 6), LFE and Non-DDS (Version 6 Synthesizers) Microwave PNA, N5224/5B – 4-Port (LFE & Version 6 Synthesizers), LFE and Non-DDS 4-72 Keysight N5224B/25B Service Guide...
Page 157 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 4-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 405-Configurable Test Set and LFE; 420-Attenuators, Bias Tees, and LFE A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq >...
Page 158: Instrument Block Diagrams - 4-Port (Sheet 7), Non-Lfe And Dds
Instrument Block Diagrams – 4-Port (Sheet 7), Non-LFE and DDS (Version 7 Synthesizer Assemblies) Instrument Block Diagrams – 4-Port (Sheet 7), Non-LFE and DDS (Version 7 Synthesizer Assemblies) Microwave PNA, N5224/5B – 4-Port (Version 7 Synthesizer Assembly), Non-LFE and DDS 4-74 Keysight N5224B/25B Service Guide...
Page 159 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 4-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 400-Standard; 401-Configurable Test Set; A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz 417-Attenuators;...
Page 160: Assemblies)
Instrument Block Diagrams – 4-Port (Sheet 8), LFE and DDS (Version 7 Synthesizer Assemblies) Instrument Block Diagrams – 4-Port (Sheet 8), LFE and DDS (Version 7 Synthesizer Assemblies) Microwave PNA, N5224/5B – 4-Port (LFE & Version 7 Synthesizer Assembly), LFE and DDS 4-76 Keysight N5224B/25B Service Guide...
Page 161 REAR PANEL FRONT PANEL INTERCONNECTS N5224B and N5225B 4-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS Including Options 405-Configurable Test Set and LFE; 420-Attenuators, Bias Tees, and LFE A24 IF MULTIPLEXER A27 MIXER BRICK (1) IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq >...
Page 162: Assemblies)
Troubleshooting Instrument Block Diagrams – 4-Port (Sheet 8), LFE and DDS (Version 7 Synthesizer Assemblies) 4-78 Keysight N5224B/25B Service Guide...
Page 163: Theory Of Operation
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Theory of Operation Information in This Chapter This chapter provides a general description of the operating theory of the N522xA 2-port and 4-port PNA microwave network analyzers. — Theory of operation is explained to the assembly level only.
Page 164 Summary of Content Start Page Digital Processing and Digital Operation of the assemblies associated with digital page 5-52 Control Group Operation processing and digital control. Power Supply Group Operation Operation of the power supply assembly group. page 5-57 Keysight N5224B/25B Service Guide...
Page 165: Network Analyzer System Operation
These IF signals are downconverted and then sampled and digitally processed. 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 N5224B/25B Service Guide...
Page 166 Theory of Operation Network Analyzer System Operation Figure 5-2 2-Port System Simplified Block Diagram Keysight N5224B/25B Service Guide...
Page 167 Theory of Operation Network Analyzer System Operation Figure 5-3 System Block Diagram Legend – LFE Block Diagrams Figure 5-4 4-Port N5290A System Simplified Block Diagram (401) – with LFE Keysight N5224B/25B Service Guide...
Page 168: Functional Groups Of The Network Analyzer
The major functional groups are: — Synthesized Source Group — Signal Separation Group — Receiver Group — Digital Processor and Digital Control Group — Power Supply Group Keysight N5224B/25B Service Guide...
Page 169 2. Version 7 synthesizers: For PNA frequency ranges and maximum output power lev- els, refer to the section “Test Port Output” in the online Keysight document, “N5224/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifica- tions.”...
Page 170 1. Version 6 synthesizers and below: For frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the N5224/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifications documents (see hyperlinks above). Keysight N5224B/25B Service Guide...
Page 171 5-57. 1. Version 7 synthesizers: For PNA frequency ranges and maximum output power lev- els, refer to the section “Test Port Output” in the online Keysight document, “N5224/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifica- tions.”...
Page 172: Synthesized Source Group Operation
(see hyperlinks above). 2. Version 7 synthesizers: For PNA frequency ranges and maximum output power lev- els, refer to the section “Test Port Output” in the online Keysight document, “N5224/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifica- tions.”...
Page 173: Basic Operation
53 MHz when the IF is 0.826 MHz. This IF signal is sent to the A16 SPAM board for digital processing. 1. A26 splitter only applies to PNA models with serial number prefix <6021. Keysight N5224B/25B Service Guide 5-11...
Page 174 7.438 MHz higher than the test signal. Since the A4, A15, and A17 13.5 GHz synthesizer boards each receive their 50 MHz input reference signal from the exact same source, frequency drift error is eliminated. 5-12 Keysight N5224B/25B Service Guide...
Page 175 Theory of Operation Synthesized Source Group Operation Figure 5-6 Source Group – Version 6 and Below Synthesizers Keysight N5224B/25B Service Guide 5-13...
Page 176 13.510 to 13.510 to 15.400 15.400 7.7037 to 8.0037 15.4074 to 16.0074 7.700 to 8.000 15.400 to 15.400 to 16.000 16.000 8.0037 to 9.5037 16.0074 to 19.0074 8.000 to 9.500 16.000 to 16.000 to 19.000 19.000 5-14 Keysight N5224B/25B Service Guide...
Page 177 43.500 to 11.550 23.100 46.200 7.7012 to 8.0012 15.4025 to 16.0025 11.550 to 23.100 to 46.200 to 12.000 24.000 48.000 8.0012 to 8.3346 16.0025 to 16.6691 12.000 to 24.000 to 48.000 to 12.500 25.000 50.000 Keysight N5224B/25B Service Guide 5-15...
Page 178 LO signal is a frequency value higher than the test signal. Since the A15 13.5 GHz DDS assembly receives 10 MHz input reference signal from the exact same source, frequency drift error is eliminated. 1. A26 splitter only applies to PNAs with serial number prefix <6021. 5-16 Keysight N5224B/25B Service Guide...
Page 179 Theory of Operation Synthesized Source Group Operation Figure 5-7 Source Group, Version 7, Part 1 (Example of Option 401 (top image) and Option 417 LFE (bottom image)) Keysight N5224B/25B Service Guide 5-17...
Page 180 6.000 to 7.600 6.756240 to 13.510 to 15.200 13.510 to 15.200 7.601240 7.600 to 9.520 7.601240 to 15.200 to 16.000 15.200 to 16.000 8.001240 7.600 to 9.520 8.001240 to 16.000 to 19.040 16.000 to 19.040 9.521240 5-18 Keysight N5224B/25B Service Guide...
Page 181 9.520 to 12.000 7.250413 to 21.750 to 22.800 43.500 to 45.600 7.600413 9.520 to 12.000 7.600413 to 22.800 to 24.000 45.600 to 48.000 8.000413 12.000 to 13.510 8.000413 to 24.000 to 25.000 48.000 to 50.000 8.333747 Keysight N5224B/25B Service Guide 5-19...
Page 182: A4, A15, And A17 13.5 Ghz Synthesizer Boards (S/N Prefixes <6021 Only)
The 100 MHz OCXO signal is coupled off to a divide-by-10 section and the resulting 10 MHz synchronized clock-signal is output from the DDS carrier board to the input of the A16 SPAM board (SPAM CLK) and to the rear panel (REF OUT). 5-20 Keysight N5224B/25B Service Guide...
Page 183: A5 And A10 26.5 Ghz Source Boards
For bands 16–18 and 24–30, the input signals are doubled, filtered, and amplified. The signals for these bands are then either passed directly to the secondary output or passed through more amplification and filtering and sent to the main output. Keysight N5224B/25B Service Guide 5-21...
Page 184: A7, A8, A12, And A13 50 Ghz Doubler Boards
( 4-port only) In bands 16–22 and 26-30, the input is amplified, ≥6021, doubled, and filtered, then sent to the output. 1. A26 splitter only applies to PNA models with serial number prefix <6021. 5-22 Keysight N5224B/25B Service Guide...
Page 185: A14 Frequency Reference Board (S/N Prefixes <6021 Only)
A23 Test Set Motherboard The A23 test set motherboard serves these functions: — to act as an interface between the A21 CPU board and the auxiliary rear panel interconnects. — to provide ALC signals to the A25 HMA26.5. Keysight N5224B/25B Service Guide 5-23...
Page 186 0 V, ground reference Interrupt In TTL in, low level (10 μs min) aborts sweep +22 V +22 Vdc, 100 mA max. 15–16 SEL1–2 TTL out, test set select bits 1-2, tied to 0 V 5-24 Keysight N5224B/25B Service Guide...
Page 187 TTL I/O, latched 25–28 Port D I/O TTL I/O, latched Port C Status TTL out, low = input mode, high = output mode Port D Status TTL out, low = input mode, high = output mode Keysight N5224B/25B Service Guide 5-25...
Page 188 Programmable ±10 V @ 100 mA out Nominally 0 ohms 2.44 mV typical resolution 1 MHz BW AnalogOut2 Analog Output Voltage Programmable ±10 V @ 100 mA out Nominally 0 ohms 2.44 mV typical resolution 1 MHz BW 5-26 Keysight N5224B/25B Service Guide...
Page 189 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 N5224B/25B Service Guide 5-27...
Page 190: A70 4-Port And A75 2-Port Low Frequency Extension (Lfe) Board
— LF output J3, Port 2, to be connected to the bias combiner Port 2. — LF output J4, Port 3, to be connected to the bias combiner Port 3. — LF output J5, Port 4, to be connected to the bias combiner Port 4. 5-28 Keysight N5224B/25B Service Guide...
Page 191 — 5 IF outputs J7, J11, J12, J13, J14, to be connected to the IF MUX board: A, B, C, D and R. Figure 5-8 Block Diagram with Synthesizer Board and LFE Board Synthesizer Bias combiner Keysight N5224B/25B Service Guide 5-29...
Page 192 Theory of Operation Synthesized Source Group Operation Figure 5-9 2-Port with LFE Synthesizer Bias combiners Figure 5-10 4-Port with LFE Synthesizer Synthesizer Bias combiners 5-30 Keysight N5224B/25B Service Guide...
Page 193 Theory of Operation Synthesized Source Group Operation Figure 5-11 2-Port LFE with IF MUX Board Bias combiners Figure 5-12 4-Port LFE with IF MUX Board Bias combiners Keysight N5224B/25B Service Guide 5-31...
Page 194 0.12207 0.12207 to 2,000 to 4,000 4096 16384 0.12207 to 0.24414 0.24414 0.24414 to 2,000 to 4,000 2048 8192 0.24414 to 0.48828 0.48828 1. Some of the LFE options are not available on all models. 5-32 Keysight N5224B/25B Service Guide...
Page 195 1.99000 to 2.000 to 4.000 15.62500 to 31.25000 31.25000 31.5000 to 2.000 to 4.000 31.25000 to 53.0000 62.50000 53.0000 to 2.000 to 4.000 31.25000 to 62.50000 62.50000 62.50000 to 2.000 to 4.000 62.50000 to 1000.0000 125.0000 Keysight N5224B/25B Service Guide 5-33...
Page 196 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 1. Some of the LFE options are not available on all models. 5-34 Keysight N5224B/25B Service Guide...
Page 197 DDS_CLK 3.90000 3.90000 to DDS_CLK 7.81000 7.81000 to DDS_CLK 9.9000 9.9000 to DDS_CLK 10.01000 10.01000 to Thru DDS_CLK 19.99000 1.99000 to DDS_CLK 31.25000 31.5000 to DDS_CLK 53.0000 53.0000 to DDS_CLK 62.50000 62.50000 to DDS_CLK 1000.0000 Keysight N5224B/25B Service Guide 5-35...
Page 198 7 synthesizers in instruments with a s/n prefix ≥6021 or that have been updated to version 7 synthesizers. 1. Some of the LFE options are not available on all models. 5-36 Keysight N5224B/25B Service Guide...
Page 199 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 2.000 to DDS_CLK 4.000 1. Some of the LFE options are not available on all models. Keysight N5224B/25B Service Guide 5-37...
Page 200 With LFE mode, we use dedicated mixers, which are the LFE board. These mixers downconvert the RF signals in LFE mode and create dedicated IF signals. These IF signals are then sent to the A24 IF Mux board. 5-38 Keysight N5224B/25B Service Guide...
Page 201 PNA. In an N5224/5B PNA, the IF frequency will change around 53 MHz. Figure 5-13 on page 5-40 shows the new structure of the frequency bands with the LFE option. The two receiver modes, mixer and direct conversion, are used in different frequency bands. Keysight N5224B/25B Service Guide 5-39...
Page 202 Theory of Operation Synthesized Source Group Operation Figure 5-13 Frequency Bands Without LFE – Version 6 and Below Synthesizers (<6021) Figure 5-14 Frequency Bands with LFE – Version 6 and Below Synthesizers (<6021) 5-40 Keysight N5224B/25B Service Guide...
Page 203: Signal Separation Group Operation
— the A29 port 1 receiver coupler and the A33 test port 1 coupler — the A30 port 3 receiver coupler and the A34 test port 3 coupler — the A31 port 4 receiver coupler and the A35 test port 4 coupler Keysight N5224B/25B Service Guide 5-41...
Page 204: A29-A32 Receiver 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, B, C, and D for 4-port models or inputs A and B for 5-42 Keysight N5224B/25B Service Guide...
Page 205: A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees
10-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 A21 CPU board. The bias tees are to provide DC biasing for the DUT. Keysight N5224B/25B Service Guide 5-43...
Page 206 Theory of Operation Signal Separation Group Operation Figure 5-15 4-Port Signal Separation Group 5-44 Keysight N5224B/25B Service Guide...
Page 207 Theory of Operation Signal Separation Group Operation Figure 5-16 2-Port Signal Separation Group Keysight N5224B/25B Service Guide 5-45...
Page 208 The bias tee combiners are to provide DC biasing for the DUT via the N5292A PNA Millimeter Test Set and millimeter heads. Refer to www.keysight.com/find/pna. See also, “A70 4-Port and A75 2-Port Low Frequency Extension (LFE) Board” on page 5-28. 5-46 Keysight N5224B/25B Service Guide...
Page 209: Receiver Group Operation
For frequencies at or above 53 MHz, the test signals (receivers A, B, C, and D for 4-port models and A and B for 2-port models) and the reference signals (receivers R1, R2, R3, and R4 for 4-port models and R1 and R2 for 2-port Keysight N5224B/25B Service Guide 5-47...
Page 210: A16 Spam Board (Analog Description)
The analog IF signals (A, B, C, D, and R for 4-port models and A, B, R1, and R2 for 2-port models) are sent to the A16 SPAM board where they are converted to digital information. 1. A26 splitter only applies to PNA models with serial number prefix <6021. 5-48 Keysight N5224B/25B Service Guide...
Page 211 Digital ground Pulse1Out Programmable pulse train output #1 (TTL) Pulse2Out Programmable pulse train output #2 (TTL) Pulse3Out Programmable pulse train output #3 (TTL) Pulse4Out Programmable pulse train output #4 (TTL) No connect DCOM Digital ground Keysight N5224B/25B Service Guide 5-49...
Page 212 Theory of Operation Receiver Group Operation Figure 5-17 4-Port Receiver Group 5-50 Keysight N5224B/25B Service Guide...
Page 213 Theory of Operation Receiver Group Operation Figure 5-18 2-Port Receiver Group Keysight N5224B/25B Service Guide 5-51...
Page 214: Digital Processing And Digital Control Group Operation
A2 USB Board — A3 Display Assembly — Keypad Assembly — A18 System Motherboard — Data Acquisition and Processing Subgroup — A16 SPAM Board (Digital Description) — A21 CPU Board — A55 Solid State Drive (SSD) 5-52 Keysight N5224B/25B Service Guide...
Page 215 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-19 Digital Processing and Digital Control Group Keysight N5224B/25B Service Guide 5-53...
Page 216: Front Panel Subgroup
The video data received from the A21 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 5-54 Keysight N5224B/25B Service Guide...
Page 217: Data Acquisition And Processing Subgroup
In addition, when the analyzer is in the system controller mode, the CPU controls peripheral devices through the peripheral port interfaces. Front panel settings are stored in SRAM, with a battery providing at least five years of backup storage when external power is off. Keysight N5224B/25B Service Guide 5-55...
Page 218 A21 CPU board. The full operating system and firmware for the network analyzer is stored on the A55 solid state drive. 5-56 Keysight N5224B/25B Service Guide...
Page 219: 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. Keysight N5224B/25B Service Guide 5-57...
Page 220 Theory of Operation Power Supply Group Operation 5-58 Keysight N5224B/25B Service Guide...
Page 221: 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 222: 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 223: 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 6 to review where the calibration stickers should be placed on the PNA. Keysight N5224B/25B Service Guide...
Page 224: 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 N5224B/25B Service Guide...
Page 225 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5224B/25B Service Guide...
Page 226: Replaceable Parts Listings
Replaceable Parts Replaceable Parts Listings Replaceable Parts Listings This section contains the replacement part numbers and their descriptions for your Keysight microwave PNA. You can find the locations of replaceable parts in this section: — listed by reference designator in Table 6-1, or —...
Page 227 6021 only) Signal processing ADC module (SPAM) board 13.5 GHz source 2 synthesizer board (Applies to PNA models with serial numbers <6021 only) System motherboard Midplane board Power supply CPU board GPIB board Keysight N5224B/25B Service Guide...
Page 228 Port 2 bias tee Port 1 receiver step attenuator Port 3 receiver step attenuator Port 4 receiver step attenuator Port 2 receiver step attenuator Solid state drive “Top Assemblies and Cables, All Options:” on page 6-10. Keysight N5224B/25B Service Guide...
Page 229 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick have the 3 dB pads inte- grated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. Keysight N5224B/25B Service Guide...
Page 230 Fuses on page 6-284 — Battery on page 6-284 — Analyzer Accessories on page 6-285 — USB Accessories on page 6-285 — ESD Supplies on page 6-285 — Rack Mount Kits and Handle Kits on page 6-285 6-10 Keysight N5224B/25B Service Guide...
Page 231: Front Panel Assembly, Front Side, All Options
Lower front panel overlay, 4-port (Options 410) N5225-80006 Lower front panel overlay, 4-port (Options 417) N5227-80005 Front panel overlay, 4-port (Options 419) W1312-40180 Front (RPG) knob  N5224-80002 Nameplate, N5224B N5225-80004 Nameplate, N5225B N5224-80003 Nameplate, N5224B, LFE N5225-80007 Nameplate, N5225B, LFE Keysight N5224B/25B Service Guide 6-11...
Page 232 Not Shown N5242-00048 Guard, jumper cables, side—2-Port & 4-Port Not Shown N5242-00049 Guard, jumper cables, center—4-Port Not shown 5023-3074 Front handle a. Some options require 14 of the 0515-1946 screws to secure dress panel overlay subpanel. 6-12 Keysight N5224B/25B Service Guide...
Page 233 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5224B/25B Service Guide 6-13...
Page 234: Front Panel Assembly, Back Side, All Options
Power switch board (PCA for Power button keypad) N5242-40014 Power button keypad Display assembly: N9912-20043 Tape (To secure cable E5071-61653 to 2090-1092 LCD’s connector and to secure cable E5071-61653 to J8 on the Interface board) 6-14 Keysight N5224B/25B Service Guide...
Page 235 N5240-60073 Touch screen controller board cable N5242-60075 Cable, A3 LED Driver board (Backlight converter board) to interface board N5242-60074 Power switch cable E5071-61660 Wire assembly, RPG (to attach RPG board (N5240-63083) to Interface board (J10) Keysight N5224B/25B Service Guide 6-15...
Page 236 Replaceable Parts Replaceable Parts Listings Figure 6-3 Front Panel Assembly, Back Side, All Options 6-16 Keysight N5224B/25B Service Guide...
Page 237 Replaceable Parts Replaceable Parts Listings Figure 6-4 A3 Display Assembly with Interface Board/USB Assemblies Keysight N5224B/25B Service Guide 6-17...
Page 238 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with LCD Display 2090-1092 (LED) and Side Brackets 6-18 Keysight N5224B/25B Service Guide...
Page 239 N5240-63074 13.5 GHz (LO) synthesizer board Was N5242-63150 N5240-63077 Signal Processing ADC Module (SPAM) board Was N5240-63056 N5240-63074 13.5 GHz (source 2) synthesizer board Was N5242-63150 N5247-60002 System motherboard W1312-60095 Midplane board 0950-4934 Power supply Keysight N5224B/25B Service Guide 6-19...
Page 240 For more information on the N8985A SSD, refer to the Windows 10 Operating System Upgrade Kit Installation Note, available online at https://www.keysight.com/us/en/assets/9018-04733/installation-guides/9018-04733.pdf (N8985-90001). e. The lithium battery is located inside the A21 CPU board assembly. Refer to “Removing and Replacing the Lithium Bat- tery” on page 7-76 for an illustration. 6-20 Keysight N5224B/25B Service Guide...
Page 241 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Options, S/N Prefixes <6021 Keysight N5224B/25B Service Guide 6-21...
Page 242 (Located on bottom of board.) N5242-60029 A14 frequency reference board J6 to A4 13.5 GHz (source 1) synthesizer board J5 (Located on bottom of board.) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-22 Keysight N5224B/25B Service Guide...
Page 243 A70/A75 LFE board to Synth LO J102 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-23...
Page 244 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Cables—All Options, S/N Prefixes <6021 6-24 Keysight N5224B/25B Service Guide...
Page 245: Top Assemblies And Cables, All Options, Serial Number Prefixes <6021
Assy, DD 3x Synthesizer (for Options 40x, 41x, 42x) N5240-69223 N5240-60222 Assy, DD 2x Synthesizer (for Options 20x, 21x, 22x) N5240-69222 N5240-60077 Signal Processing ADC Module (SPAM) board Was N5240-60056 not used N5247-60002 System motherboard W1312-60095 Midplane board 0950-4934 Power supply Keysight N5224B/25B Service Guide 6-25...
Page 246 For more information on the N8985A SSD, refer to the Windows 10 Operating System Upgrade Kit Installation Note, available online at https://www.keysight.com/us/en/assets/9018-04733/installation-guides/9018-04733.pdf (N8985-90001). e. The lithium battery is located inside the A21 CPU board assembly. Refer to “Removing and Replacing the Lithium Bat- tery” on page 7-76 for an illustration. 6-26 Keysight N5224B/25B Service Guide...
Page 247 Replaceable Parts Replaceable Parts Listings Figure 6-8 Top Assemblies, All Options, S/N Prefixes ≥6021 Keysight N5224B/25B Service Guide 6-27...
Page 248 A24 IF multiplexer board P603 to A16 SPAM board J2 (SPAM 5, 2-port) W150 N5247-60024 A24 IF multiplexer board P203 to A16 SPAM board J5 (SPAM 5, 2-port) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-28 Keysight N5224B/25B Service Guide...
Page 249 A70/A75 LFE board to A11 DD Synth (LO) J13 to A70 LFE J18 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-29...
Page 250 Replaceable Parts Replaceable Parts Listings Figure 6-9 Top Cables, All Cables—All Options, S/N Prefixes ≥6021 6-30 Keysight N5224B/25B Service Guide...
Page 251: 2-Port Configurations, Serial Number Prefix <6021
Be very careful to use the appropriate hardware in your analyzer. Using the wrong hardware can ruin analyzer components, resulting in additional customer costs. Bottom Assemblies, Standard 2-Port Configuration, Option 200, S/N Prefix <6021 Reference Description Part Number Designator N5245-60157 Test set motherboard Was N5247-60001 Keysight N5224B/25B Service Guide 6-31...
Page 252 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. 6-32 Keysight N5224B/25B Service Guide...
Page 253 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Assemblies, Standard 2-Port Configuration, Option 200, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-33...
Page 254 Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-34 Keysight N5224B/25B Service Guide...
Page 255 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom RF Cables, Standard 2-Port Configuration, Option 200, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-35...
Page 256 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-36 Keysight N5224B/25B Service Guide...
Page 257 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-37...
Page 258 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch N5240-60058 Front panel LED board  a. Part numbers in italic typeface are for rebuilt exchange assemblies. Refer to “Rebuilt-Exchange Assemblies” on page 6-4. 6-38 Keysight N5224B/25B Service Guide...
Page 259 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-39...
Page 260 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Assemblies, 2-Port, Option 201, S/N Prefix <6021 6-40 Keysight N5224B/25B Service Guide...
Page 261 N5242-60025 A27 mixer brick (R1) to A24 IF multiplexer (P601) W148 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-41...
Page 262 Replaceable Parts Listings Reference Part Number Description Type Designator W191 & Refer to “Top Cables, All Cables—All Options, S/N Prefixes <6021” on page 6-22. W193 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-42 Keysight N5224B/25B Service Guide...
Page 263 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom RF Cables, 2-Port, Option 201, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-43...
Page 264 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-44 Keysight N5224B/25B Service Guide...
Page 265 Replaceable Parts Replaceable Parts Listings Figure 6-15 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 201, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-45...
Page 266 5087-6417 Was: 5087-7323 Was: 5087-6323 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch N5291-60005 LFE PC board – 2-port 6-46 Keysight N5224B/25B Service Guide...
Page 267 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-47...
Page 268 Replaceable Parts Replaceable Parts Listings Figure 6-16 Bottom Assemblies, 2-Port, Option 205, S/N Prefix <6021 6-48 Keysight N5224B/25B Service Guide...
Page 269 “Top Cables, All Cables—All Options, S/N Prefixes <6021” on page 6-22. W193 W181 N5245-20178 Cable assy-RF FP, port 1 CPLR THRU to A71 bias combiner, port 1 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-49...
Page 270 W213 8120-5014 RF cable, A70 LFE J7 to A24 IF Multiplexer P404 W215 8120-5021 RF cable, A70 LFE J12 to A24 IF Multiplexer P804 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-50 Keysight N5224B/25B Service Guide...
Page 271 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom RF Cables, 2-Port, Option 205, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-51...
Page 272 A23 test set motherboard J544 to A74 port 2 bias tee Combiner a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-52 Keysight N5224B/25B Service Guide...
Page 273 Replaceable Parts Replaceable Parts Listings Figure 6-18 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 205, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-53...
Page 274 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-54 Keysight N5224B/25B Service Guide...
Page 275 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Assemblies, 2-Port, Option 210, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-55...
Page 276 “Top Cables, All Cables—All Options, S/N Prefixes <6021” on page 6-22. W193 a. SR = semirigid coaxial cable; F = flexible coaxial cable 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-56 Keysight N5224B/25B Service Guide...
Page 277 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom RF Cables, 2-Port, Option 210, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-57...
Page 278 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-58 Keysight N5224B/25B Service Guide...
Page 279 Replaceable Parts Replaceable Parts Listings Figure 6-21 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 210, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-59...
Page 280 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator 6-60 Keysight N5224B/25B Service Guide...
Page 281 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-61...
Page 282 Replaceable Parts Replaceable Parts Listings Figure 6-22 Bottom Assemblies, 2-Port, Option 217, S/N Prefix <6021 6-62 Keysight N5224B/25B Service Guide...
Page 283 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-63...
Page 284 A49 port 2 receiver attenuator to A27 mixer brick (B) W147 N5242-60025 A27 mixer brick (R1) to A24 IF multiplexer (P601) W148 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-64 Keysight N5224B/25B Service Guide...
Page 285 Replaceable Parts Replaceable Parts Listings Figure 6-23 Bottom RF Cables, 2-Port, Option 217, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-65...
Page 286 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-66 Keysight N5224B/25B Service Guide...
Page 287 Replaceable Parts Replaceable Parts Listings Figure 6-24 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 217, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-67...
Page 288 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator 6-68 Keysight N5224B/25B Service Guide...
Page 289 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-69...
Page 290 Replaceable Parts Replaceable Parts Listings Figure 6-25 Bottom Assemblies, 2-Port, Option 219, S/N Prefix <6021 6-70 Keysight N5224B/25B Service Guide...
Page 291 A36 port 2 coupler to A45 port 2 bias tee N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-71...
Page 292 A27 mixer brick (R2) to A24 IF multiplexer (P801) W191 and Refer to “Top Assemblies, All Options, S/N Prefixes <6021” on page 6-19. W193 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-72 Keysight N5224B/25B Service Guide...
Page 293 Replaceable Parts Replaceable Parts Listings Figure 6-26 Bottom RF Cables, 2-Port, Option 219, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-73...
Page 294 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-74 Keysight N5224B/25B Service Guide...
Page 295 Replaceable Parts Replaceable Parts Listings Figure 6-27 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-75...
Page 296 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator 6-76 Keysight N5224B/25B Service Guide...
Page 297 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-77...
Page 298 Replaceable Parts Replaceable Parts Listings Figure 6-28 Bottom Assemblies, 2-Port, Option 220, S/N Prefix <6021 6-78 Keysight N5224B/25B Service Guide...
Page 299 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) W148 N5242-60025 A27 mixer brick (R1) to A24 IF multiplexer (P601) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-79...
Page 300 W213 8120-5014 RF cable, A70 LFE J7 to A24 IF Multiplexer P404 W215 8120-5021 RF cable, A70 LFE J12 to A24 IF Multiplexer P804 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-80 Keysight N5224B/25B Service Guide...
Page 301 Replaceable Parts Replaceable Parts Listings Figure 6-29 Bottom RF Cables, 2-Port, Option 220, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-81...
Page 302 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-82 Keysight N5224B/25B Service Guide...
Page 303 Replaceable Parts Replaceable Parts Listings Figure 6-30 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 220, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-83...
Page 304: 2-Port Configurations, Serial Number Prefix ≥6021
Options 210/410. But, the HMA26.5 multiplier amplifier changes are potentially applicable to all Options. Be very careful to use the appropriate hardware in your analyzer. Using the wrong hardware can ruin analyzer components, resulting in additional customer costs. 6-84 Keysight N5224B/25B Service Guide...
Page 305 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-85...
Page 306 Replaceable Parts Replaceable Parts Listings Figure 6-31 Bottom Assemblies, Standard 2-Port Configuration, Option 200, S/N Prefix ≥6021 6-86 Keysight N5224B/25B Service Guide...
Page 307 Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-87...
Page 308 Replaceable Parts Replaceable Parts Listings Figure 6-32 Bottom RF Cables, Standard 2-Port Configuration, Option 200, S/N Prefix ≥6021 6-88 Keysight N5224B/25B Service Guide...
Page 309 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-89...
Page 310 Replaceable Parts Replaceable Parts Listings Figure 6-33 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200, S/N Prefix ≥6021 6-90 Keysight N5224B/25B Service Guide...
Page 311 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch N5240-60058 Front panel LED board  1250-4261 50 ohm termination (connect to HMA26.5 top connector).  Indicated, but not shown in Figure. Keysight N5224B/25B Service Guide 6-91...
Page 312 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-92 Keysight N5224B/25B Service Guide...
Page 313 Replaceable Parts Replaceable Parts Listings Figure 6-34 Bottom Assemblies, 2-Port, Option 201, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-93...
Page 314 A27 mixer brick (R2) to A24 IF multiplexer (P801) W210 Refer to “Top Cables, All Cables—All Options, S/N Prefixes ≥6021” on page 6-28. 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-94 Keysight N5224B/25B Service Guide...
Page 315 Replaceable Parts Replaceable Parts Listings a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224B/25B Service Guide 6-95...
Page 316 Replaceable Parts Replaceable Parts Listings Figure 6-35 Bottom RF Cables, 2-Port, Option 201, S/N Prefix ≥6021 6-96 Keysight N5224B/25B Service Guide...
Page 317 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-97...
Page 318 Replaceable Parts Replaceable Parts Listings Figure 6-36 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 201, S/N Prefix ≥6021 6-98 Keysight N5224B/25B Service Guide...
Page 319 Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch N5291-60005 LFE PC board – 2-port 5087-7403 Port 1 bias combiner (includes wire harness) Port 2 bias combiner (includes wire harness) Keysight N5224B/25B Service Guide 6-99...
Page 320 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-100 Keysight N5224B/25B Service Guide...
Page 321 Replaceable Parts Replaceable Parts Listings Figure 6-37 Bottom Assemblies, 2-Port, Option 205, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-101...
Page 322 Cable assy-RF FP, port 1 CPLR THRU to A71 bias combiner, port 1 W184 N5245-20177 Cable assy-RF FP, A74 port 2 bias combiner to A36 test port coupler, port 2 (2-port only) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-102 Keysight N5224B/25B Service Guide...
Page 323 W213 8120-5014 RF cable, A70 LFE J7 to A24 IF Multiplexer P404 W215 8120-5021 RF cable, A70 LFE J12 to A24 IF Multiplexer P804 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224B/25B Service Guide 6-103...
Page 324 Replaceable Parts Replaceable Parts Listings Figure 6-38 Bottom RF Cables, 2-Port, Option 205, S/N Prefix ≥6021 6-104 Keysight N5224B/25B Service Guide...
Page 325 A23 test set motherboard J544 to A74 port 2 bias tee Combiner a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-105...
Page 326 Replaceable Parts Replaceable Parts Listings Figure 6-39 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 205, S/N Prefix ≥6021 6-106 Keysight N5224B/25B Service Guide...
Page 327 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-107...
Page 328 Replaceable Parts Replaceable Parts Listings Figure 6-40 Bottom Assemblies, 2-Port, Option 210, S/N Prefix ≥6021 6-108 Keysight N5224B/25B Service Guide...
Page 329 “Top Cables, All Cables—All Options, S/N Prefixes ≥6021” on page 6-28. a. SR = semirigid coaxial cable; F = flexible coaxial cable 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-109...
Page 330 Replaceable Parts Replaceable Parts Listings Figure 6-41 Bottom RF Cables, 2-Port, Option 210, S/N Prefix ≥6021 6-110 Keysight N5224B/25B Service Guide...
Page 331 A18 system motherboard J13 to A23 test set motherboard J545  8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-111...
Page 332 Replaceable Parts Replaceable Parts Listings Figure 6-42 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 210, S/N Prefix ≥6021 6-112 Keysight N5224B/25B Service Guide...
Page 333 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator Keysight N5224B/25B Service Guide 6-113...
Page 334 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-114 Keysight N5224B/25B Service Guide...
Page 335 Replaceable Parts Replaceable Parts Listings Figure 6-43 Bottom Assemblies, 2-Port, Option 217, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-115...
Page 336 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-116 Keysight N5224B/25B Service Guide...
Page 337 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) W210 Refer to “Top Cables, All Cables—All Options, S/N Prefixes ≥6021” on page 6-28. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224B/25B Service Guide 6-117...
Page 338 Replaceable Parts Replaceable Parts Listings Figure 6-44 Bottom RF Cables, 2-Port, Option 217, S/N Prefix ≥6021 6-118 Keysight N5224B/25B Service Guide...
Page 339 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-119...
Page 340 Replaceable Parts Replaceable Parts Listings Figure 6-45 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 217, S/N Prefix ≥6021 6-120 Keysight N5224B/25B Service Guide...
Page 341 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator Keysight N5224B/25B Service Guide 6-121...
Page 342 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-122 Keysight N5224B/25B Service Guide...
Page 343 Replaceable Parts Replaceable Parts Listings Figure 6-46 Bottom Assemblies, 2-Port, Option 219, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-123...
Page 344 A36 port 2 coupler to A45 port 2 bias tee N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-124 Keysight N5224B/25B Service Guide...
Page 345 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) W210 Refer to “Top Cables, All Cables—All Options, S/N Prefixes ≥6021” on page 6-28. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224B/25B Service Guide 6-125...
Page 346 Replaceable Parts Replaceable Parts Listings Figure 6-47 Bottom RF Cables, 2-Port, Option 219, S/N Prefix ≥6021 6-126 Keysight N5224B/25B Service Guide...
Page 347 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-127...
Page 348 Replaceable Parts Replaceable Parts Listings Figure 6-48 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219, S/N Prefix ≥6021 6-128 Keysight N5224B/25B Service Guide...
Page 349 5087-7760 Test port 1 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 2 coupler 5087-7759 Reference mixer switch 33325-60016 Test port 1 source attenuator Test port 2 source attenuator Keysight N5224B/25B Service Guide 6-129...
Page 350 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-130 Keysight N5224B/25B Service Guide...
Page 351 Replaceable Parts Replaceable Parts Listings Figure 6-49 Bottom Assemblies, 2-Port, Option 220, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-131...
Page 352 N5242-60025 A27 mixer brick (R1) to A24 IF multiplexer (P601) W148 N5242-60026 A27 mixer brick (R2) to A24 IF multiplexer (P801) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-132 Keysight N5224B/25B Service Guide...
Page 353 W213 8120-5014 RF cable, A70 LFE J7 to A24 IF Multiplexer P404 W215 8120-5021 RF cable, A70 LFE J12 to A24 IF Multiplexer P804 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224B/25B Service Guide 6-133...
Page 354 Replaceable Parts Replaceable Parts Listings Figure 6-50 Bottom RF Cables, 2-Port, Option 220, S/N Prefix ≥6021 6-134 Keysight N5224B/25B Service Guide...
Page 355 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-135...
Page 356 Replaceable Parts Replaceable Parts Listings Figure 6-51 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 220, S/N Prefix ≥6021 6-136 Keysight N5224B/25B Service Guide...
Page 357 Options 210/410. But, the HMA26.5 multiplier amplifier changes are potentially applicable to all Options. Be very careful to use the appropriate hardware in your analyzer. Using the wrong hardware can ruin analyzer components, resulting in additional customer costs. Keysight N5224B/25B Service Guide 6-137...
Page 358 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. 6-138 Keysight N5224B/25B Service Guide...
Page 359 Replaceable Parts Replaceable Parts Listings Figure 6-52 Bottom Assemblies, Standard 4-Port Configuration, Option 400, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-139...
Page 360 A29 port 1 receiver coupler to A33 port 1 coupler W112 N5224-20015 A30 port 3 receiver coupler to A34 port 3 coupler 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-140 Keysight N5224B/25B Service Guide...
Page 361 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-141...
Page 362 Replaceable Parts Replaceable Parts Listings Figure 6-53 Bottom RF Cables, Standard 4-Port Configuration, Option 400, S/N Prefix <6021 6-142 Keysight N5224B/25B Service Guide...
Page 363 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-143...
Page 364 Replaceable Parts Replaceable Parts Listings Figure 6-54 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400, S/N Prefix <6021 6-144 Keysight N5224B/25B Service Guide...
Page 365 Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 5087-7759 Reference mixer switch Keysight N5224B/25B Service Guide 6-145...
Page 366 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. 6-146 Keysight N5224B/25B Service Guide...
Page 367 Replaceable Parts Replaceable Parts Listings Figure 6-55 Bottom Assemblies, 4-Port, Option 401, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-147...
Page 368 A37 reference mixer switch to front-panel REF 1 RCVR R1 IN N5245-20007 REF 1 SOURCE OUT to A37 reference mixer switch 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-148 Keysight N5224B/25B Service Guide...
Page 369 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-149...
Page 370 Replaceable Parts Replaceable Parts Listings Figure 6-56 Bottom RF Cables, 4-Port, Option 401, S/N Prefix <6021 6-150 Keysight N5224B/25B Service Guide...
Page 371 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277 Keysight N5224B/25B Service Guide 6-151...
Page 372 Replaceable Parts Replaceable Parts Listings Figure 6-57 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 401, S/N Prefix <6021 6-152 Keysight N5224B/25B Service Guide...
Page 373 Test port 1 receiver coupler Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler Keysight N5224B/25B Service Guide 6-153...
Page 374 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. 6-154 Keysight N5224B/25B Service Guide...
Page 375 Replaceable Parts Replaceable Parts Listings Figure 6-58 Bottom Assemblies, 4-Port, Option 405, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-155...
Page 376 REF 4 RCVR R4 IN to A69 3 dB pad on A28 mixer brick (R4) Was: N5245-20021 N5245-20011 REF 2 RCVR R2 IN to A27 mixer brick (R2) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-156 Keysight N5224B/25B Service Guide...
Page 377 N5245-20183 Cable assy-RF FP, A74 port 2 bias combiner to A36 test port coupler, port 2 W189 N5245-20192 Cable assy-RF FP, port 4 A31 receiver coupler to front-panel REF 4 SOURCE OUT (Option 405 only) Keysight N5224B/25B Service Guide 6-157...
Page 378 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-158 Keysight N5224B/25B Service Guide...
Page 379 Replaceable Parts Replaceable Parts Listings Figure 6-59 Bottom RF Cables, 4-Port, Option 405, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-159...
Page 380 A19 test set motherboard J542 to A74 port 2 bias tee a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-160 Keysight N5224B/25B Service Guide...
Page 381 Replaceable Parts Replaceable Parts Listings Figure 6-60 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 405, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-161...
Page 382 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-162 Keysight N5224B/25B Service Guide...
Page 383 Replaceable Parts Replaceable Parts Listings Figure 6-61 Bottom Assemblies, 4-Port, Option 410, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-163...
Page 384 A27 mixer brick (R1) to A24 IF multiplexer (P411) N5242-60022 A27 mixer brick (R2) to A24 IF multiplexer (P412) N5242-60018 A27 mixer brick (B) to A24 IF multiplexer (P201) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-164 Keysight N5224B/25B Service Guide...
Page 385 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. Keysight N5224B/25B Service Guide 6-165...
Page 386 Replaceable Parts Replaceable Parts Listings Figure 6-62 Bottom RF Cables, 4-Port, Option 410, S/N Prefix <6021 6-166 Keysight N5224B/25B Service Guide...
Page 387 A18 system motherboard J13 to A23 test set motherboard J545  8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5224B/25B Service Guide 6-167...
Page 388 Replaceable Parts Replaceable Parts Listings Figure 6-63 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 410, S/N Prefix <6021 6-168 Keysight N5224B/25B Service Guide...
Page 389 Test port 1 receiver coupler Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler Keysight N5224B/25B Service Guide 6-169...
Page 390 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. 6-170 Keysight N5224B/25B Service Guide...
Page 391 Replaceable Parts Replaceable Parts Listings Figure 6-64 Bottom Assemblies, 4-Port, Option 417, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-171...
Page 392 A32 port 2 receiver coupler to A41 port 2 source attenuator N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 6-172 Keysight N5224B/25B Service Guide...
Page 393 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. Keysight N5224B/25B Service Guide 6-173...
Page 394 Replaceable Parts Replaceable Parts Listings Figure 6-65 Bottom RF Cables, 4-Port, Option 417 (Ports 1 and 2), S/N Prefix <6021 6-174 Keysight N5224B/25B Service Guide...
Page 395 N5245-20195 W203 N5247-20138 Dust cap, A28 mixer brick termination  a. SR = semirigid coaxial cable; F = flexible coaxial cable 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-175...
Page 396 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-176 Keysight N5224B/25B Service Guide...
Page 397 Replaceable Parts Replaceable Parts Listings Figure 6-66 Bottom RF Cables, 4-Port, Option 417 (Ports 3 and 4), S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-177...
Page 398 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-178 Keysight N5224B/25B Service Guide...
Page 399 Replaceable Parts Replaceable Parts Listings Bottom Ribbon Cables & Wire Harnesses, 4-Port, Option 417 , S/N Prefix Figure 6-67 <6021 Keysight N5224B/25B Service Guide 6-179...
Page 400 Test port 1 receiver coupler Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 6-180 Keysight N5224B/25B Service Guide...
Page 401 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. Keysight N5224B/25B Service Guide 6-181...
Page 402 Replaceable Parts Replaceable Parts Listings Figure 6-68 Bottom Assemblies, 4-Port, Option 419, S/N Prefix <6021 6-182 Keysight N5224B/25B Service Guide...
Page 403 A33 port 1 coupler to A42 port 1 bias tee N5245-20029 A32 port 2 receiver coupler to A41 port 2 source attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-183...
Page 404 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. 6-184 Keysight N5224B/25B Service Guide...
Page 405 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2) , S/N Prefix <6021 Figure 6-69 Keysight N5224B/25B Service Guide 6-185...
Page 406 A48 port 4 receiver attenuator to A28 mixer brick (D) RF cable, A25 HMA26.5 (top) to A28 mixer brick (top) N5245-20195 W203 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-186 Keysight N5224B/25B Service Guide...
Page 407 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-187...
Page 408 Replaceable Parts Replaceable Parts Listings Figure 6-70 Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4), S/N Prefix <6021 6-188 Keysight N5224B/25B Service Guide...
Page 409 A23 test set motherboard J552 to A28 mixer brick (2) J52 Was N5245-60008 N5230-60014 A23 test set motherboard J209 to A25 HMA26.5 J1 Was N5242-60011 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-189...
Page 410 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-190 Keysight N5224B/25B Service Guide...
Page 411 Replaceable Parts Replaceable Parts Listings Figure 6-71 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-191...
Page 412 Test port 1 receiver coupler Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 6-192 Keysight N5224B/25B Service Guide...
Page 413 Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. d. Only applies to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick has the 3 dB pads integrated in the mixer brick. Keysight N5224B/25B Service Guide 6-193...
Page 414 Replaceable Parts Replaceable Parts Listings Figure 6-72 Bottom Assemblies, 4-Port, Option 420, S/N Prefix <6021 6-194 Keysight N5224B/25B Service Guide...
Page 415 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-195...
Page 416 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. 6-196 Keysight N5224B/25B Service Guide...
Page 417 Replaceable Parts Replaceable Parts Listings Bottom RF Cables, 4-Port, Option 420 (Ports 1 and 2) , S/N Prefix <6021 Figure 6-73 Keysight N5224B/25B Service Guide 6-197...
Page 418 Cable, assembly, coaxial LFE (Port 4 bias combiner “RF-IN” to W157 “Port4” A70 LFE board) W183 N5245-20180 Cable assy-RF FP, port 3 CPLR THRU to bias combiner, port 3 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-198 Keysight N5224B/25B Service Guide...
Page 419 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-199...
Page 420 Replaceable Parts Replaceable Parts Listings Figure 6-74 Bottom RF Cables, 4-Port, Option 420 (Ports 3 and 4), S/N Prefix <6021 6-200 Keysight N5224B/25B Service Guide...
Page 421 A23 test set motherboard J546 to A41 port 2 source attenuator N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 N5245-60008 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-201...
Page 422 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-202 Keysight N5224B/25B Service Guide...
Page 423 Replaceable Parts Replaceable Parts Listings Figure 6-75 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 420, S/N Prefix <6021 Keysight N5224B/25B Service Guide 6-203...
Page 424: 4-Port Configurations, Serial Number Prefix ≥6021
Options 210/410. But, the HMA26.5 multiplier amplifier changes are potentially applicable to all Options. Be very careful to use the appropriate hardware in your analyzer. Using the wrong hardware can ruin analyzer components, resulting in additional customer costs. 6-204 Keysight N5224B/25B Service Guide...
Page 425 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-205...
Page 426 Replaceable Parts Replaceable Parts Listings Figure 6-76 Bottom Assemblies, Standard 4-Port Configuration, Option 400, S/N Prefix ≥6021 6-206 Keysight N5224B/25B Service Guide...
Page 427 A32 port 2 receiver coupler to A36 port 2 coupler W115 N5224-20022 A33 port 1 coupler to A27 mixer brick (A) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-207...
Page 428 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-208 Keysight N5224B/25B Service Guide...
Page 429 Replaceable Parts Replaceable Parts Listings Figure 6-77 Bottom RF Cables, Standard 4-Port Configuration, Option 400, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-209...
Page 430 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-210 Keysight N5224B/25B Service Guide...
Page 431 Replaceable Parts Replaceable Parts Listings Figure 6-78 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-211...
Page 432 Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 5087-7759 Reference mixer switch 6-212 Keysight N5224B/25B Service Guide...
Page 433 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-213...
Page 434 Replaceable Parts Replaceable Parts Listings Figure 6-79 Bottom Assemblies, 4-Port, Option 401, S/N Prefix ≥6021 6-214 Keysight N5224B/25B Service Guide...
Page 435 A37 reference mixer switch to front-panel REF 1 RCVR R1 IN N5245-20007 REF 1 SOURCE OUT to A37 reference mixer switch 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-215...
Page 436 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-216 Keysight N5224B/25B Service Guide...
Page 437 Replaceable Parts Replaceable Parts Listings Example 6-1 Bottom RF Cables, 4-Port, Option 401, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-217...
Page 438 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-218 Keysight N5224B/25B Service Guide...
Page 439 Replaceable Parts Replaceable Parts Listings Figure 6-80 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 401, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-219...
Page 440 Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 5087-7759 Reference mixer switch 6-220 Keysight N5224B/25B Service Guide...
Page 441 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-221...
Page 442 Replaceable Parts Replaceable Parts Listings Figure 6-81 Bottom Assemblies, 4-Port, Option 405, S/N Prefix ≥6021 6-222 Keysight N5224B/25B Service Guide...
Page 443 REF 4 RCVR R4 IN to A69 3 dB pad on A28 mixer brick (R4) Was: N5245-20021 N5245-20011 REF 2 RCVR R2 IN to A27 mixer brick (R2) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-223...
Page 444 N5245-20183 Cable assy-RF FP, A74 port 2 bias combiner to A36 test port coupler, port 2 W189 N5245-20192 Cable assy-RF FP, port 4 A31 receiver coupler to front-panel REF 4 SOURCE OUT (Option 405 only) 6-224 Keysight N5224B/25B Service Guide...
Page 445 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-225...
Page 446 Replaceable Parts Replaceable Parts Listings Figure 6-82 Bottom RF Cables, 4-Port, Option 405, S/N Prefix ≥6021 6-226 Keysight N5224B/25B Service Guide...
Page 447 A19 test set motherboard J542 to A74 port 2 bias tee a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-227...
Page 448 Replaceable Parts Replaceable Parts Listings Figure 6-83 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 405, S/N Prefix ≥6021 6-228 Keysight N5224B/25B Service Guide...
Page 449 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. Keysight N5224B/25B Service Guide 6-229...
Page 450 Replaceable Parts Replaceable Parts Listings Figure 6-84 Bottom Assemblies, 4-Port, Option 410, S/N Prefix ≥6021 6-230 Keysight N5224B/25B Service Guide...
Page 451 A27 mixer brick (R1) to A24 IF multiplexer (P411) N5242-60022 A27 mixer brick (R2) to A24 IF multiplexer (P412) N5242-60018 A27 mixer brick (B) to A24 IF multiplexer (P201) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-231...
Page 452 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. 6-232 Keysight N5224B/25B Service Guide...
Page 453 Replaceable Parts Replaceable Parts Listings Figure 6-85 Bottom RF Cables, 4-Port, Option 410, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-233...
Page 454 Rear-panel HANDLER I/O to A23 test set motherboard J400  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-234 Keysight N5224B/25B Service Guide...
Page 455 Replaceable Parts Replaceable Parts Listings Figure 6-86 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 410, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-235...
Page 456 Test port 1 receiver coupler Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 6-236 Keysight N5224B/25B Service Guide...
Page 457 The splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, and N5245-20101 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed, refer to “Verify the Model/Version of HMA26.5 Installed” on page 7-40 and to Figure 7-19 on page 7-40. Keysight N5224B/25B Service Guide 6-237...
Page 458 Replaceable Parts Replaceable Parts Listings Figure 6-87 Bottom Assemblies, 4-Port, Option 417, S/N Prefix ≥6021 – (Bias Tees require Option 419 – Ignore for Option 417) 6-238 Keysight N5224B/25B Service Guide...
Page 459 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-239...
Page 460 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-240 Keysight N5224B/25B Service Guide...
Page 461 Replaceable Parts Replaceable Parts Listings Figure 6-88 Bottom RF Cables, 4-Port, Option 417 (Ports 1 and 2), S/N Prefix ≥6021 – Bias Tees Require Option 419 – Ignore for Option 417 Keysight N5224B/25B Service Guide 6-241...
Page 462 Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-242 Keysight N5224B/25B Service Guide...
Page 463 Replaceable Parts Replaceable Parts Listings Figure 6-89 Bottom RF Cables, 4-Port, Option 417 (Ports 3 and 4), S/N Prefix ≥6021 – Bias Tees Require Option 419 – Ignore for Option 417 Keysight N5224B/25B Service Guide 6-243...
Page 464 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-244 Keysight N5224B/25B Service Guide...
Page 465 Replaceable Parts Replaceable Parts Listings Figure 6-90 Bottom Ribbon Cables & Wire Harnesses, 4-Port, Option 417, S/N Prefix ≥6021 – Bias Tees Require Option 419 – Ignore for Option 417 Keysight N5224B/25B Service Guide 6-245...
Page 466 Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 5087-7759 Reference mixer switch 6-246 Keysight N5224B/25B Service Guide...
Page 467 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-247...
Page 468 Replaceable Parts Replaceable Parts Listings Figure 6-91 Bottom Assemblies, 4-Port, Option 419, S/N Prefix ≥6021 6-248 Keysight N5224B/25B Service Guide...
Page 469 Port 2 CPLR THRU to A45 port 2 bias tee N5245-20087 A45 port 2 bias tee to A36 port 2 coupler 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-249...
Page 470 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-250 Keysight N5224B/25B Service Guide...
Page 471 Replaceable Parts Replaceable Parts Listings Figure 6-92 Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2), S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-251...
Page 472 A48 port 4 receiver attenuator to A28 mixer brick (D) N5247-20138 Dust cap, A28 mixer brick termination  a. SR = semirigid coaxial cable; F = flexible coaxial cable 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-252 Keysight N5224B/25B Service Guide...
Page 473 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick have the 3 dB pads inte- grated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. Keysight N5224B/25B Service Guide 6-253...
Page 474 Replaceable Parts Replaceable Parts Listings Figure 6-93 Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4), S/N Prefix ≥6021 6-254 Keysight N5224B/25B Service Guide...
Page 475 A23 test set motherboard J552 to A28 mixer brick (2) J52 Was N5245-60008 N5230-60014 A23 test set motherboard J209 to A25 HMA26.5 J1 Was N5242-60011 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-255...
Page 476 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-256 Keysight N5224B/25B Service Guide...
Page 477 Replaceable Parts Replaceable Parts Listings Figure 6-94 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-257...
Page 478 Test port 3 receiver coupler Test port 4 receiver coupler Test port 2 receiver coupler 5087-7793 Test port 1 coupler Test port 3 coupler Test port 4 coupler Test port 2 coupler 5087-7759 Reference mixer switch 6-258 Keysight N5224B/25B Service Guide...
Page 479 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5224B/25B Service Guide 6-259...
Page 480 Replaceable Parts Replaceable Parts Listings Figure 6-95 Bottom Assemblies, 4-Port, Option 420, S/N Prefix ≥6021 6-260 Keysight N5224B/25B Service Guide...
Page 481 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-261...
Page 482 The N5245-20195 cable is used only with instruments that have a newer HMA26.5 installed. If your PNA has a legacy 5087-7765 HMA26.5 assembly installed, then this cable can be discarded. If you are unclear which HMA26.5 assembly your PNA has installed, refer to Figure 7-19 on page 7-40. 6-262 Keysight N5224B/25B Service Guide...
Page 483 Replaceable Parts Replaceable Parts Listings Figure 6-96 Bottom RF Cables, 4-Port, Option 420 (Ports 1 and 2), S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-263...
Page 484 Cable assy-RF FP, port 3 CPLR THRU to A73 bias combiner, port 3 W186 N5245-20185 Cable assy-RF FP, port 4 A74 bias combiner to A35 test port coupler, port 4 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. 6-264 Keysight N5224B/25B Service Guide...
Page 485 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick have the 3 dB pads inte- grated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. Keysight N5224B/25B Service Guide 6-265...
Page 486 Replaceable Parts Replaceable Parts Listings Figure 6-97 Bottom RF Cables, 4-Port, Option 420 (Ports 3 and 4), S/N Prefix ≥6021 6-266 Keysight N5224B/25B Service Guide...
Page 487 A23 test set motherboard J546 to A41 port 2 source attenuator N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 N5245-60008 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277. Keysight N5224B/25B Service Guide 6-267...
Page 488 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-268 Keysight N5224B/25B Service Guide...
Page 489 Replaceable Parts Replaceable Parts Listings Figure 6-98 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 420, S/N Prefix ≥6021 Keysight N5224B/25B Service Guide 6-269...
Page 490 Replaceable Parts Replaceable Parts Listings 6-270 Keysight N5224B/25B Service Guide...
Page 491 Termination, 50 ohm load Was: 1810-0118 8121-0834 HANDLER I/O cable assembly Ferrite for HANDLER I/O cable assembly 9170-2236 2190-0068 Lock washer 2950-0054 Hex nut Bottom foot (Refer to “External Hardware and Miscellaneous Parts, All Options” on page 6-282.) Keysight N5224B/25B Service Guide 6-271...
Page 492 8120-5063 BNC cable a. This part number is no longer required on s/n’s 5541, 5542, 5544, 5545, 5547, 5549 and newer. But, is included for your ref- erence. Figure 6-99 Rear Panel Assembly, All Options 6-272 Keysight N5224B/25B Service Guide...
Page 493 5 to attach the 3-fan assy to chassis.) Chassis (Refer to “Internal Hardware and Miscellaneous Parts, All Options” on page 6-280.)  E4440-00021 EMI shield, round, adhesive. (Located on center hub of 2 fans only.)  Keysight N5224B/25B Service Guide 6-273...
Page 494 Replaceable Parts Replaceable Parts Listings Figure 6-100 Fan Assemblies, Side View, All Options 6-274 Keysight N5224B/25B Service Guide...
Page 495 Machine screw, M3.0 x 20, flat head (To attach source bracket to source (1) and source (2). not shown 0515-0666 Machine screw, M3.0 x 18, pan head (To attach source bracket to source (1) and source (2). Keysight N5224B/25B Service Guide 6-275...
Page 496 Replaceable Parts Replaceable Parts Listings Figure 6-101 Top Hardware and Miscellaneous Parts, Top View, All Options 6-276 Keysight N5224B/25B Service Guide...
Page 497 Bracket (For A37 reference mixer switch.) N5245-00022 Bracket (For semi rigid cables; only 1 used for 2-port, both used for 4-port.) N5245-00015 Bracket (For A47 port 3 & A48 port 4 rcvr attenuators & all src attenuators.) Keysight N5224B/25B Service Guide 6-277...
Page 498 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick have the 3 dB pads integrated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. 6-278 Keysight N5224B/25B Service Guide...
Page 499 Figure 7-19 on page 7-40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 6-31 “4-Port Configuration, Serial Number Prefix <6021” on page 6-137. Keysight N5224B/25B Service Guide 6-279...
Page 500 N5247-00013 Front bracket  N5242-40002 PC board guides  6-280 Keysight N5224B/25B Service Guide...
Page 501 Replaceable Parts Replaceable Parts Listings Figure 6-103 Internal Hardware and Miscellaneous Parts, All Options Keysight N5224B/25B Service Guide 6-281...
Page 502 Machine screw, M3.0 x 8, pan head (To attach inner cover.)  N5247-00004 Inner cover (retaining shield)  0515-1227 Machine screw, M3.0 x 6, flat head (To attach inner cover.)  Not shown N9040-40007 Front impact cover Not shown N9040-40008 Rear impact cover 6-282 Keysight N5224B/25B Service Guide...
Page 503 Replaceable Parts Replaceable Parts Listings Figure 6-104 External Hardware and Miscellaneous Parts, All Options Keysight N5224B/25B Service Guide 6-283...
Page 504 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 N5225-90001 from the Keysight Web site.)
Page 505 N5232AU-1CP or N5239AU-1CP Option 1CP includes the following separately orderable items: Rack mount kit (rack mount flanges and hardware) 5063-1555 Rack mount rail set E3663AC 5063-1542 Front handle kit (two classic handles and hardware) Touch-up Paint Keysight N5224B/25B Service Guide 6-285...
Page 506 Titanium (for use on cover) 6010-3329 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. 6-286 Keysight N5224B/25B Service Guide...
Page 507: Repair And Replacement Procedures
Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Repair and Replacement Procedures Before replacing the A23 board, if possible: Run EEBackup.exe using the directory for your Windows operating system: Windows 7 OS: C:/Program Files (x86)/Agilent/Network Analyzer/Service/EEBackup.exe. Click on Save EEPROM Backup, and then click on Backup TSMB Memory.
Page 508: Information In This Chapter
Repair and Replacement Procedures Information in This Chapter Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Keysight Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content...
Page 509 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 N5224B/25B Service Guide...
Page 510 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 N5224B/25B Service Guide...
Page 511 Port 3 receiver coupler Port 4 receiver coupler Port 2 receiver coupler Port 1 test port coupler page 7-48 Port 3 test port coupler Port 4 test port coupler Port 2 test port coupler Reference mixer switch page 7-50 Keysight N5224B/25B Service Guide...
Page 512 3 dB pads integrated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the 5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. Refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 10 Keysight N5224B/25B Service Guide...
Page 513 Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5224B/25B Service Guide...
Page 514 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5224B/25B Service Guide...
Page 515 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 7-78. Keysight N5224B/25B Service Guide...
Page 516 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal 7-10 Keysight N5224B/25B Service Guide...
Page 517 3. Disconnect the following cables from the A1 front panel interface board: tape (item [14]) from connector and the LCD display to interface board cable (item [18]), LED driver board (backlight converter board) to interface Keysight N5224B/25B Service Guide 7-11...
Page 518 4. Remove two screws (item ) and remove the power switch board. 5. 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. 7-12 Keysight N5224B/25B Service Guide...
Page 519 10. With a T-6 TORX (set to 3-in-lb), remove the 2 screws (item 23) on the 2nd side bracket (item [21]). During re-assembly of the side brackets to the LCD display, it is very important to avoid over-tightening. Keysight N5224B/25B Service Guide 7-13...
Page 520 11. The touch screen can now be removed from the front panel assembly. Note the orientation of the touch screen in the front panel assembly for installation of the new touch screen. Figure 7-3 Front Panel Sub-assemblies Removal 7-14 Keysight N5224B/25B Service Guide...
Page 521 Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Figure 7-4 A3 Display Assembly with LCD Display - Cables Figure 7-5 Remove LCD Cable, LCD to LED Inverter Board Cable, & Side Brackets Keysight N5224B/25B Service Guide 7-15...
Page 522 Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Figure 7-6 Remove LCD Mounting Plate to LCD Display & LCD Display Cable Figure 7-7 Removing the Flat Flex Cable from the LCD to the Controller Board 7-16 Keysight N5224B/25B Service Guide...
Page 523 Repair and Replacement Procedures Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Figure 7-8 Power Keypad to Power Button Board Figure 7-9 Remove Speaker Assembly and Mounting Foam Keysight N5224B/25B Service Guide 7-17...
Page 524 Removing and Replacing the A1–A3 and Other Front Panel Subassemblies 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 7-78. 7-18 Keysight N5224B/25B Service Guide...
Page 525 Adjust the slack in the gray flexible cable to move it out of the way, and lift the board out of the chassis. 4. A7, A8, A12, A13 boards: on the bottom side of the analyzer, disconnect  cables (item ) from the cable brackets. Keysight N5224B/25B Service Guide 7-19...
Page 526 The A4, A15, and A17 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 7-78. 7-20 Keysight N5224B/25B Service Guide...
Page 527 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-21...
Page 528 12. Remove the right side and left side fan brackets. Disconnect the right fan wire and the left fan wire from the A18 System Motherboard, and then remove the fan brackets. Refer to “Removing and Replacing the Fans” on page 7-74. 7-22 Keysight N5224B/25B Service Guide...
Page 529 20. Lift the A18 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 7-78. Keysight N5224B/25B Service Guide 7-23...
Page 530 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. 7-24 Keysight N5224B/25B Service Guide...
Page 531 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 7-78. Keysight N5224B/25B Service Guide 7-25...
Page 532 Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Figure 7-12 A19 Midplane Board Removal 7-26 Keysight N5224B/25B Service Guide...
Page 533 5. Slide the A20 power supply assembly 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 7-78. Keysight N5224B/25B Service Guide 7-27...
Page 534 Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Figure 7-13 A20 Power Supply Assembly Removal 7-28 Keysight N5224B/25B Service Guide...
Page 535 (SSD)” on page 7-57. 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 7-78. Keysight N5224B/25B Service Guide 7-29...
Page 536 Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Figure 7-14 A21 CPU Board Assembly Removal 7-30 Keysight N5224B/25B Service Guide...
Page 537 6. Slide the A22 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 7-78. Keysight N5224B/25B Service Guide 7-31...
Page 538 Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Figure 7-15 A22 GPIB Board Removal 7-32 Keysight N5224B/25B Service Guide...
Page 539 Click on Save EEPROM Backup, and then click on Backup TSMB Memory. Windows 10 OS (32-bit): C:/Program Files (x86)/Keysight/Network Analyzer/Service/EEBackup.exe. Click on Save EEPROM Backup, and then click on Backup TSMB Memory. The firmware revision numbers for Win10 (32-bit) are A.13.30.xx through A.13.95.xx.
Page 540 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 7-78. 7-34 Keysight N5224B/25B Service Guide...
Page 541 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-35...
Page 542 Torque rear panel RF connector nuts to 21 in-lbs and PULSE I/O connector screws to 6 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 7-78. 7-36 Keysight N5224B/25B Service Guide...
Page 543 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-37...
Page 544 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. 7-38 Keysight N5224B/25B Service Guide...
Page 545 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-39...
Page 546 — W53 N5245-20023 — W54 N5245-20022 The new N5240-60101 HMA26.5 has the splitter integrated into the assembly. Refer to Figure 7-19 on page 7-40. Figure 7-19 Comparison of Legacy HMA26.5 (5087-7765) and New HMA26.5 (N5240-60101) 7-40 Keysight N5224B/25B Service Guide...
Page 547 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-41...
Page 548 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. 7-42 Keysight N5224B/25B Service Guide...
Page 549 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Prefix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-43...
Page 550 Torque all RF cable connections to 10 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 7-78. 7-44 Keysight N5224B/25B Service Guide...
Page 551 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-45...
Page 552 1. Reverse the order of the removal procedure. Torque all RF connectors to 10 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 7-78. 7-46 Keysight N5224B/25B Service Guide...
Page 553 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-47...
Page 554 If necessary, replace  the vibration mount (item ). Refer to “Bottom Hardware and Miscellaneous Parts” on page 6-277 for replacement part numbers. Torque all connectors to 10 in-lbs. Torque coupler nuts to 72 in-lbs. 7-48 Keysight N5224B/25B Service Guide...
Page 555 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. Keysight N5224B/25B Service Guide 7-49...
Page 556 ) and torque the connectors to 10 in-lbs, then tighten the mounting screws. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-78. 7-50 Keysight N5224B/25B Service Guide...
Page 557 Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Figure 7-24 A37 Reference Mixer Switch Removal Keysight N5224B/25B Service Guide 7-51...
Page 558  8. Remove two screws (item ) to remove the attenuator to be replaced, from the mounting bracket. Replacement Procedure 1. Reverse the order of the removal procedure. Torque all cable connections to 10 in-lbs. 7-52 Keysight N5224B/25B Service Guide...
Page 559 Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-78. Figure 7-25 Source and Receiver Attenuators Keysight N5224B/25B Service Guide 7-53...
Page 560 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. 7-54 Keysight N5224B/25B Service Guide...
Page 561 Remember to place the wire harness cable ground lug on the proper mounting screw. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-78. Keysight N5224B/25B Service Guide 7-55...
Page 562 Figure 7-19 on page 40 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre- fix <6021” on page 31 “4-Port Configuration, Serial Number Prefix <6021” on page 137. 7-56 Keysight N5224B/25B Service Guide...
Page 563 — 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 564 Install Backup Files onto the New SSD The files that were previously saved onto a USB flash memory drive must now be installed onto the new SSD. The network analyzer must be powered up and operating. 7-58 Keysight N5224B/25B Service Guide...
Page 565 2. Remove the outer cover. Refer to “Removing the Covers” on page 7-7. 3. Position the analyzer bottom side up. 4. Remove the A23 test set motherboard. Refer to “Removing and Replacing the A23 Test Set Motherboard” on page 7-33. Keysight N5224B/25B Service Guide 7-59...
Page 566 Removing and Replacing the A70 or A75 Low Frequency Extension (LFE) Board 5. Disconnect the 8121-2919 and N5245-60005 ribbon cables. Refer to Figure 7-28 on page 7-60. Figure 7-28 Disconnect Ribbon Cables from Rear Panel Connectors (8121-2919, N5245-60005) 7-60 Keysight N5224B/25B Service Guide...
Page 567 ) from the A70 LFE board. Refer to Figure 7-29 on page 7-61. Figure 7-29 A70 LFE Board Remove Cables (8120-5014 (x2), 8120-5017 (x3), N5242-60078, N5242-60080). 4-port is Shown. 2-port is Similar, but with Less Cables. Keysight N5224B/25B Service Guide 7-61...
Page 568 Remove A71 bias combiner cable (N5240-60097) from “Port1” connector on the A70 LFE board N5240-60097 8. A70 LFE boards only: Remove port 3 bias combiner “RF IN” cable from the “Port3” connector on the LFE board. Similar to Figure 7-30 on page 7-62. 7-62 Keysight N5224B/25B Service Guide...
Page 569 A74 port 2 bias combiner cable (N5240-60097) from “Port2” connector on the A70 LFE board 10. A70 LFE boards only: Remove port 4 bias combiner “RF IN” cable from the “Port4” connector on the LFE board. Similar to Figure 7-31 on page 7-63. Keysight N5224B/25B Service Guide 7-63...
Page 570 Attach the new A70 LFE board to the standoffs using the screws removed from the old one. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-78. 7-64 Keysight N5224B/25B Service Guide...
Page 571 Figure 7-33 on page 7-67. See also Figure 7-36 on page 7-68. 7. Remove two screws that attach the bias tee combiner to the bracket (Now  do item ). Refer to Figure 7-34 on page 7-67. Keysight N5224B/25B Service Guide 7-65...
Page 572 Figure 7-34 on page 7-67, position the bias tees on the attenuator brackets as indicated. 3. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-78. 7-66 Keysight N5224B/25B Service Guide...
Page 573 A71–A74 Bias Tee Combiners and Cables Removal. (N5222B Option 420 Shown. All Other PNA LFE Options are Similar. Figure 7-34 Remove Bias Combiner Bracket Assemblies from the Chassis (N5245-00036/N5245-00037, 0515-0372, 5087-7403, 0515-1227). (All Assemblies are Shown, but Only Remove the Defective Assembly.) Keysight N5224B/25B Service Guide 7-67...
Page 574 Repair and Replacement Procedures Removing and Replacing the A71–A74 Bias Tee Combiners Figure 7-35 Remove DC Bias Cable from Bias Combiner (N5240-60091) Figure 7-36 Remove Bias Combiner, Cables, and Clamps (5023-3299, 5087-7403, 0515-2141, and N5240-60097) 7-68 Keysight N5224B/25B Service Guide...
Page 575 Repair and Replacement Procedures Removing and Replacing the A71–A74 Bias Tee Combiners Figure 7-37 Mark Bias Combiner With a Permanent Marker Keysight N5224B/25B Service Guide 7-69...
Page 576 9. 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 7-78. 7-70 Keysight N5224B/25B Service Guide...
Page 577 Repair and Replacement Procedures Removing and Replacing the Rear Panel Figure 7-38 Rear Panel Removal Keysight N5224B/25B Service Guide 7-71...
Page 578 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 7-78. 7-72 Keysight N5224B/25B Service Guide...
Page 579 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards Figure 7-39 Front Panel LED Boards Removal Keysight N5224B/25B Service Guide 7-73...
Page 580 Pull up the center pin of each of the fan rivets as shown by (item in the illustration.  c. Pull out the rivet completely (as shown by (item ) in the illustration) to release the fan and fan guard. 7-74 Keysight N5224B/25B Service Guide...
Page 581 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 7-78. Figure 7-40 B1 Fan Removal Keysight N5224B/25B Service Guide 7-75...
Page 582 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 7-78. 7-76 Keysight N5224B/25B Service Guide...
Page 583 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-41 Lithium Battery Removal Keysight N5224B/25B Service Guide 7-77...
Page 584 No adjustment needed Front Panel Keypad and RPG Test A3 Display Test Chapter 4 A2 USB board No adjustment needed Check for proper operation A3 display assembly Touchscreen Adjustment and A3 Display Test Chapter 4 Verification 7-78 Keysight N5224B/25B Service Guide...
Page 585 IF Gain Adjustment Source Power Accuracy Test Receiver Characterization Source Maximum Power Output Receiver Adjustment Test IF Response Adjustment Source Power Linearity Test (Available Only with Option The Operator’s Check S93093/4A and or S93900/1/2/4/5/7A Installed) Keysight N5224B/25B Service Guide 7-79...
Page 586 Synthesizer Bandwidth Source Maximum Power Output Test Adjustment Source Power Linearity Test Source Adjustment The Operator’s Check IF Gain Adjustment Receiver Characterization Receiver Adjustment IF Response Adjustment (Available Only with Option S93093/4A and or S93900/1/2/4/5/7A Installed) 7-80 Keysight N5224B/25B Service Guide...
Page 587 Synthesizer Bandwidth Source Maximum Power Output Test Adjustment Source Power Linearity Test Source Adjustment The Operator’s Check IF Gain Adjustment Receiver Characterization Receiver Adjustment IF Response Adjustment (Available Only with Option S93093/4A and or S93900/1/2/4/5/7A Installed) Keysight N5224B/25B Service Guide 7-81...
Page 588 A26 splitter (PNA models with IF Gain Adjustment Receiver Compression Test serial number prefixes <6021 Receiver Characterization Dynamic Accuracy Test only) Receiver Adjustment IF Response Adjustment (Available Only with Option S93093/4A and or S93900/1/2/4/5/7A Installed) 7-82 Keysight N5224B/25B Service Guide...
Page 589 S93093/4A and or S93900/1/2/4/5/7A Installed) A42–A45 bias tees Source Adjustment Source Maximum Power Output IF Gain Adjustment Test Receiver Characterization Calibration Coefficients Test Receiver Adjustment IF Response Adjustment (Available Only with Option S93093/4A and or S93900/1/2/4/5/7A Installed) Keysight N5224B/25B Service Guide 7-83...
Page 590 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 not, new data must be generated by performing the Receiver Adjustment 7-84 Keysight N5224B/25B Service Guide...
Page 591 Click all of the items that apply. b. When satisfied, click on Modify. c. Click Exit. Figure 7-42 Mechanical Cycle Counter window (Port 1 NOISE TUNER SWITCH and Port 2 NOISE RECVR SWITCH are only applicable for Option 029) Keysight N5224B/25B Service Guide 7-85...
Page 592 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 593 Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide General Purpose Maintenance Procedures Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Error Terms How to use error terms as a preventive maintenance and page 8-88 troubleshooting tool.
Page 594 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 8-94. 8-88 Keysight N5224B/25B Service Guide...
Page 595 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 N5224B/25B Service Guide 8-89...
Page 596 R = Reflection Tracking X = Crosstalk (Isolation) L = Load Match T = Transmission Tracking 2nd Subscript: F = forward measurement (Ports 1 to Port 2) R = reverse measurement (Ports 2 to Port 1) 8-90 Keysight N5224B/25B Service Guide...
Page 597 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 N5224B/25B Service Guide 8-91...
Page 598 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 8-92 Keysight N5224B/25B Service Guide...
Page 599 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 N5224B/25B Service Guide 8-93...
Page 600 All crosstalk values are typical. Measurement conditions: normalized to a thru, measured with two shorts, 10 Hz IF band- width, averaging factor of 8, alternate mode, source power set to the lesser of the maximum power out or the maximum receiver power. 8-94 Keysight N5224B/25B Service Guide...
Page 601 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 N5224B/25B Service Guide 8-95...
Page 602 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 4-52 or to “Checking the Signal Separation Group” on page 4-47. 8-96 Keysight N5224B/25B Service Guide...
Page 603 Keysight License Manager Accessing the Keysight License Manager To start the Keysight License Manager: — Press Start > Keysight License Manager > Keysight License Manager . A Keysight License Manager dialog box will appear. Figure 8-5 Keysight License Manager Window Software Entitlement Certificate If you have received an “Software Entitlement Certificate”, follow the...
Page 604 (KLM). Refer to https://www.keysight.com/us/en/assets/9018-04534/installation-guides /9018-04534.pdf (N5242-90024). Some applications require a license key file that is provided by Keysight. If you do not have the required license key file, contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-7 To enable or remove an option: 1.
Page 605 It is necessary to reinstall the instrument serial number if the test set midplane board is replaced. To change an incorrect serial number, it is necessary for your instrument to be connected directly to the LAN and to a Keysight IP network. Refer to “Contacting Keysight” on page 2-7.
Page 606 Recovering from Solid State Drive Problems If you suspect that you have a solid state drive problem, go to the “Hard Drive Recovery” link on the Keysight PNA Series: Service & Support Home Page on the Internet. The URL for the Keysight PNA Series: Service & Support Home Page is: http://mktwww.srs.is.keysight.com/field/service/network/pna/...
Page 607 — Navigate to the EEPROM Backup Utility, located at: C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program. — Click Backup EEPROM. — Click Backup TSMB Mem. — Click Exit when the program has finished. Keysight N5224B/25B Service Guide 8-101...
Page 608 General Purpose Maintenance Procedures Correction Constants 8-102 Keysight N5224B/25B Service Guide...
Page 609 Keysight Technologies - Appendix N52xxB Microwave Network Analyzers Service Guide EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 EEPROM Address Assignments and Location Physical Location Board Rev Letter Cal Body Contents Addr E080 A16 SPAM...
Page 610 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 (Continued)EEPROM Address Assignments and Location (Continued) Physical Location Board Rev Letter Cal Body Contents Addr A4 LO Synth rev 4 (N5230-60002) Synth Power Cal E580 A4 LO Synth rev 5 (N5242-60150/166) A4 LO Synth rev 6 (N5240-60074/76)
Page 611 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Table A-1 (Continued)EEPROM Address Assignments and Location (Continued) Physical Location Board Rev Letter Cal Body Contents Addr A12 50 GHz Doubler (5087–7318 assembly, 5067–1335 bias board) EB00 Unused A12 50 GHz Doubler (5087-7349 assembly, 5067-1361 bias board) A12 50 GHz Doubler...
Page 612 EEPROM Address Assignments and Location (N5224/5A&B PNA and N5244/5A&B PNA-X Instruments) Appendix–4 Service Guide...
Page 613 Installation Note Xxxxx-xxxxx...
Page 614 This information is subject to change without notice. © Keysight Technologies 2011-2022 Edition 1, July 2022 N5225-90026 www.keysight.com...

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