Keysight Technologies N5224A Service Manual
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Keysight Technologies N5224A Service Manual

2-port and 4-port pna microwave network analyzers, 10 mhz to 43.5 / 50 ghz
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Keysight
2-Port and 4-Port
PNA Microwave Network Analyzers
This manual provides documentation for the
following models:
N5224A (10 MHz to 43.5 GHz)
N5225A (10 MHz to 50 GHz)
Service Guide

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Summary of Contents for Keysight Technologies N5224A

  • Page 1 Keysight 2-Port and 4-Port PNA Microwave Network Analyzers This manual provides documentation for the following models: N5224A (10 MHz to 43.5 GHz) N5225A (10 MHz to 50 GHz) Service Guide...

  • Page 2: Safety Notices

    DOCUMENT THAT CONFLICT WITH THESE TERMS, THE WARRANTY beyond those set forth in the TERMS IN THE SEPARATE EULA shall apply, except to the © Keysight Technologies, Inc. AGREEMENT WILL CONTROL. extent that those terms, rights, or 2011-2017 licenses are explicitly required...

  • Page 3: Table Of Contents

    System Specifications ........... 3-7 Keysight N5224A/25A Service Guide...
  • Page 4 Assembly Replacement Sequence ..........4-5 Keysight N5224A/25A Service Guide...
  • Page 5 Signal Separation Group Operation ......... . . 5-17 Keysight N5224A/25A Service Guide...
  • Page 6 Internal Hardware and Miscellaneous Parts, All Options ..... . . 6-103 External Hardware and Miscellaneous Parts, All Options ..... . 6-105 Keysight N5224A/25A Service Guide...
  • Page 7 Information in This Chapter ..........8-1 Keysight N5224A/25A Service Guide...
  • Page 8 Storing Correction Constants ..........8-17 Keysight N5224A/25A Service Guide...

  • Page 9: 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 10: 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 N5224A/25A Service Guide...

  • Page 11: General Safety Considerations

    If unstable power levels are expected, the analyzer input power must be buffered by a line conditioner. This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 61010-1:2001 and 664 respectively. Keysight N5224A/25A Service Guide...
  • Page 12 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 N5224A/25A Service Guide...

  • Page 13: 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. Keysight N5224A/25A Service Guide...
  • Page 14 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5224A/25A Service Guide...

  • Page 15: 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 6-106 for part numbers. Keysight N5224A/25A Service Guide...
  • Page 16 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5224A/25A Service Guide...

  • Page 17: Regulatory Information

    This is a marking to indicate product compliance with the Canadian Interference-Causing ICES/NMB-001 Equipment Standard (ICES-001). Direct Current. IP 2 0 The instrument has been designed to meet the requirements of IP 2 0 for egress and operational environment. Keysight N5224A/25A Service Guide...

  • Page 18: 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 19: General Product Information

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide General Product Information Information in This Chapter Chapter Two at-a-Glance Section Title Summary of Content Start Page Maintenance Cleaning instructions for the external surfaces of your page 2-2 analyzer. Information about electrical maintenance of your analyzer.

  • Page 20: 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 N5224A/25A Service Guide...

  • Page 21: Analyzer Options, Accessories, And Upgrades Available

    The adapter contains 11 SMB-male coaxial connectors and a mating connector for the rear-panel PULSE I/O connector. This adapter can be ordered as model number N1966A. Figure 2-1 Pulse I/O Adapter Keysight N5224A/25A Service Guide...

  • Page 22: 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 N5224A/25A Service Guide...
  • Page 23 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-20 TORX driver 2.4 N-m (21 in-lb) setting 1/4-inch and 5/16-inch Thin profile 8710-0510 open-end wrench Keysight N5224A/25A Service Guide...
  • Page 24 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 N5224A/25A Service Guide...

  • Page 25: Keysight Support, Services, And Assistance

    — R1282A Return to Keysight Calibration Plan The analyzer is delivered with a one-year calibration certificate. Options are available to have Keysight Technologies provide three or five year calibration coverage (perform the annual calibration two or four times). Options for basic calibration or ISO/IEC 17025 or ANSI/NCSL Z540.3–2006 standards compliant calibrations are available.

  • Page 26: Shipping Your Analyzer To Keysight For Service Or Repair

    Keysight for repair. If you wish to send your network analyzer to Keysight Technologies for service or repair: —...

  • Page 27: 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 28 Performance Tests — Source Maximum Power Output Test — Source Power Linearity Test — Frequency Accuracy Test — Trace Noise Test — Receiver Compression Test — Noise Floor Test — Calibration Coefficients Test — Dynamic Accuracy Test Keysight N5224A/25A Service Guide...
  • Page 29 IF Response Adjustment (Option 090, 093, or 094 Only) a. These performance tests are included in the analyzer’s firmware for Options 897 and 898. b. These adjustments are included in the analyzer’s firmware on all models and options. Keysight N5224A/25A Service Guide...

  • Page 30: 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 N5224A/25A Service Guide...

  • Page 31: Allow The Analyzer To Warm Up

    — Use correct end of calibration block — Gage all connectors before first use Making Connections — Align connectors carefully Do Not — Apply bending force to connection — Make preliminary connection contact — Over tighten preliminary connection lightly Keysight N5224A/25A Service Guide...
  • Page 32 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 N5224A/25A Service Guide...

  • Page 33: 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 N5224A/25A Service Guide...

  • Page 34: 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 N5224A/25A Service Guide...

  • Page 35: Certificate Of Calibration

    About System Verification and Performance Tests Certificate of Calibration Keysight Technologies will issue a certificate of calibration upon successful completion of system verification or completion of the performance tests. The certificate of calibration will apply to the “system” (analyzer, calibration kit, test cables, and any necessary adapters) if the system verification procedure is used to confirm the system specifications.

  • Page 36: 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 N5224A/25A Service Guide...

  • Page 37: 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 N5224A/25A Service Guide 3-11...

  • Page 38: 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 N5224A/25A Service Guide...
  • Page 39 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 N5224A/25A Service Guide 3-13...

  • Page 40: 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 N5224A/25A Service Guide...
  • Page 41 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 N5224A/25A Service Guide 3-15...
  • Page 42 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 N5224A/25A Service Guide...
  • Page 43 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 N5224A/25A Service Guide 3-17...
  • Page 44 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 N5224A/25A Service Guide...
  • Page 45 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 N5224A/25A Service Guide 3-19...
  • Page 46 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 N5224A/25A Service Guide...

  • Page 47: 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 N5224A/25A Service Guide 3-21...

  • Page 48: Measurement Traceability

    National Institute of Standards and Technology (NIST) (see Figure 3-9). This chain of measurements defines how the verification process brings traceability to the network analyzer system. 3-22 Keysight N5224A/25A Service Guide...

  • Page 49: 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 N5224A/25A Service Guide 3-23...
  • Page 50 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 N5224A/25A Service Guide...
  • Page 51 (ECal) that is being used by clicking on it. The corresponding verification kit to use is selected for you and displayed in the Verification Kit box. Refer to Figure 3-10. 5. Under Printer Output, click one of the following options. Refer to Figure 3-10. Keysight N5224A/25A Service Guide 3-25...
  • Page 52 This will invalidate the calibration that you performed earlier. 1. Disconnect and clean the device that failed the verification test. 2. Reconnect the device making sure that all connections are torqued to the proper specifications. 3. Measure the device again. 3-26 Keysight N5224A/25A Service Guide...
  • Page 53 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 N5224A/25A Service Guide 3-27...
  • Page 54 Tests and Adjustments System Verification Each S-parameter measurement result is printed with frequency tested, lower and upper limit lines, the measured data, and the result of the test. Figure 3-12 Example of Printed Tabular Verification Results 3-28 Keysight N5224A/25A Service Guide...
  • Page 55 — 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 N5224A/25A Service Guide 3-29...
  • Page 56 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5224A/25A Service Guide...

  • Page 57: Performance Tests

    3. A power sensor is connected to the test port, using any necessary adapters. 4. The analyzer frequency is set to the desired value. 5. The power meter correction table is set to the same frequency. Keysight N5224A/25A Service Guide 3-31...

  • Page 58: Source Maximum Power Output Test

    7. The power level at this point is measured and compared to the maximum output power specification. 8. This process is repeated at hundreds of frequencies across the analyzer’s full range in every specified path configuration. If the Analyzer Fails this Test: 3-32 Keysight N5224A/25A Service Guide...

  • Page 59: Source Power Linearity Test

    “Source Adjustment” on page 3-42 and repeat this test. — If the analyzer still fails this test, troubleshoot the source section of the analyzer and then repeat this test. Refer to “Checking the Source Group” on page 4-34. Keysight N5224A/25A Service Guide 3-33...

  • Page 60: Frequency Accuracy Test

    Function of the Test: To measure the stability of a signal in the internal source and receiver system of your analyzer. Specification Tested: Test Port Input–Trace Noise Magnitude and Trace Noise Phase Equipment Used: A test cable. 3-34 Keysight N5224A/25A Service Guide...

  • Page 61: Receiver Compression Test

    Function of the Test: To measure the compression at the analyzer’s specified maximum power level for the receivers. Specification Tested: Test Port Input–Maximum Test Port Input Level Equipment Used: — U3070AK01 or Z5623A Option K01 Compression Test Set — Power meter — Power sensors Keysight N5224A/25A Service Guide 3-35...
  • Page 62 13.The magnitude and phase measurements using the receiver under test are read: (Pd). 14.The compression for each point is calculated as (Pa–Pb) – (Pd–Pc). If the Analyzer Fails this Test: — Run the Receiver Characterization adjustment, and repeat this test. 3-36 Keysight N5224A/25A Service Guide...

  • Page 63: Noise Floor Test

    8. The test cable is removed and loads are connected to both ports. 9. A CW linear measurement sweep is measured for each test point. The receiver test power level, Ptest, in dBm is calculated for each point from the mean of each sweep. Keysight N5224A/25A Service Guide 3-37...

  • Page 64: Calibration Coefficients Test

    6. This process is repeated for Ports 3 and 4 on 4-port analyzers. If the Analyzer Fails this Test: — Failure of the directivity error term is often due to a faulty test port coupler. Replace the coupler and repeat this test. 3-38 Keysight N5224A/25A Service Guide...

  • Page 65: Dynamic Accuracy Test

    5. The analyzer’s receiver measurement is retrieved and compared with a perfect sine wave. Any deviation is due to receiver non-linearity. 6. The test set’s output attenuator is changed in 5 dB steps from 0 to 60 dB, and this measurement is repeated. Keysight N5224A/25A Service Guide 3-39...
  • Page 66 “Removing and Replacing the A27 and A28 Mixer Bricks” on page 7-36. — 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 7-14. 3-40 Keysight N5224A/25A Service Guide...

  • Page 67: Adjustments

    Any that will measure a signal at 10 MHz. Procedure This adjustment typically adjusts to within ±0.01 ppm. 1. Connect the equipment as shown in Figure 3-14. Connect a GPIB cable between the network analyzer and the frequency counter. Keysight N5224A/25A Service Guide 3-41...

  • Page 68: 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 3-42 Keysight N5224A/25A Service Guide...

  • Page 69: If Gain Adjustment

    2. Follow the instructions and prompts as they are displayed. Receiver Characterization This characterizes the receivers in your analyzer. Procedure Service Adjustments 1. Press UTILITY System , then , then , then click Receiver Characterization. Keysight N5224A/25A Service Guide 3-43...

  • Page 70: 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 3-16. Connect a GPIB cable between the network analyzer and the power meter. 3-44 Keysight N5224A/25A Service Guide...
  • Page 71 , then , then , then click Receiver Adjustment. 3. Ensure the GPIB settings are correct. 4. Follow the instructions and prompts as they are displayed. Figure 3-17 Equipment Setup 2 for the Receiver Adjustment Keysight N5224A/25A Service Guide 3-45...

  • Page 72: Ee Default Adjustment

    Procedure Service Adjustments 1. Press UTILITY , then , then , then click IF System Response Adjustment. 2. Follow the instructions and prompts as they are displayed. 3-46 Keysight N5224A/25A Service Guide...

  • Page 73: 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 74: Chapter Four At-A-Glance

    This represents a “hardkey”, a key that is physically located on the instrument. Hardkey This represents a “softkey”, a key whose label is determined by the instrument Softkey firmware. Menu Item This represents an item in a drop-down or pop-up menu. Keysight N5224A/25A Service Guide...

  • Page 75: Operating The Analyzer With Covers Removed

    Operating the Analyzer With Covers Removed Operating the Analyzer With Covers Removed Do not operate the analyzer with the outer cover removed for more than 30 minutes, as this could cause the analyzer to overheat which could result in costly damage. Keysight N5224A/25A Service Guide...

  • Page 76: Protect Against Electrostatic Discharge (Esd)

    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 N5224A/25A Service Guide...

  • Page 77: 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 N5224A/25A Service Guide...

  • Page 78: Getting Started With Troubleshooting

    Check the Basics A problem can often be solved by repeating the procedure you were following when the problem occurred. Before calling Keysight Technologies or returning the instrument for service, please perform the following checks: 1. Is there power at the mains receptacle? If not, correct this situation and proceed.
  • Page 79 Troubleshooting Getting Started with Troubleshooting Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” Go to “Front Panel Troubleshooting” Go to “Rear Panel Troubleshooting” Go to “Measurement System Troubleshooting” Keysight N5224A/25A Service Guide...

  • Page 80: Power Up Troubleshooting

    “Troubleshooting LCD Display Problems” on page 4-14. — If the instrument appears to abort the network analyzer measurement interface process, contact Keysight. Refer to “Contacting Keysight” on page 2-7. Keysight N5224A/25A Service Guide...

  • Page 81: Power Supply Check

    ACOM as ground reference for analog supplies and the point marked DCOM as ground reference for digital supplies. Refer to Figure 4-2 for the power supply measurement points on the A19 midplane board. Refer to Table 4-2 on page 4-11 for the correct voltages. Keysight N5224A/25A Service Guide...
  • Page 82 Failure to do so can result in personal injury or loss of life. Do not operate the analyzer with the outer cover removed for more than 30 minutes, as this could cause the analyzer to overheat which could result in costly damage. 4-10 Keysight N5224A/25A Service Guide...
  • Page 83 If the missing supply voltages return to a “power on” condition after removal of an assembly, suspect that assembly as being defective. Remove the network analyzer assemblies in the order specified in the following steps (refer to Chapter 7 for removal instructions). Keysight N5224A/25A Service Guide 4-11...
  • Page 84 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. 4-12 Keysight N5224A/25A Service Guide...
  • Page 85 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. Keysight N5224A/25A Service Guide 4-13...

  • Page 86: 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 7-10. 4-14 Keysight N5224A/25A Service Guide...
  • Page 87 4. If the front panel interface ribbon cable is properly connected, suspect that one or more of the following is defective: — inverter board (mounted on the display assembly) — A1 front panel interface board — A3 display assembly Keysight N5224A/25A Service Guide 4-15...

  • Page 88: Front Panel Troubleshooting

    Service More Front Panel Test Press UTILITY , then , then , then System A Front Panel Key Test Utility dialog box will be displayed, as shown in Figure 4-4. 4-16 Keysight N5224A/25A Service Guide...
  • Page 89 Subassemblies” on page 7-10. Table 4-2 Front Panel Keyboard Key Names TRACE/CHAN RESPONSE ENTRY ENTRY Keys Keys Keys Keys (Cont’d) Trace 1 Meas Trace 2 Format Cancel Enter Trace 3 Scale Help . (decimal point) Keysight N5224A/25A Service Guide 4-17...
  • Page 90 3. If the movement of numbers is not smooth or no numbers appear at all, suspect a faulty A1 front panel interface board. To replace the A1 front panel interface board, refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-10. 4-18 Keysight N5224A/25A Service Guide...

  • Page 91: A3 Display Test

    USB port. — Wait 15 seconds for the analyzer to verify the device connection, and then check the operation of the USB device. — If the device performs correctly, the USB board is functioning properly. Keysight N5224A/25A Service Guide 4-19...

  • Page 92: A1 Front Panel Interface Board

    Checking the Operation of the Key Pad Commands To verify the key pad functionality, refer to “Front Panel Keypad and RPG Test” on page 4-16. Checking the Display To verify the display functionality, refer to “A3 Display Test” on page 4-19. 4-20 Keysight N5224A/25A Service Guide...

  • Page 93: Rear Panel Troubleshooting

    , then Configure , then SICL/GPIB... SICL/GPIB/SCPI dialog box is displayed. 3. In the GPIB block, click System Controller to establish the analyzer as a controller. Wait for the analyzer to configure, and then click OK. Keysight N5224A/25A Service Guide 4-21...

  • Page 94: Lan Troubleshooting

    Problems with the Local Area Network (LAN) can be difficult to solve. Software and protocol problems can make it difficult to determine whether the analyzer's hardware is working properly, or if there is a problem with the LAN or cabling. 4-22 Keysight N5224A/25A Service Guide...
  • Page 95 Windows Taskbar menu at the bottom of the display. b. On the Windows Taskbar menu, click Start, point to Programs, Accessories, and then click Command Prompt. c. The command prompt window is displayed. Keysight N5224A/25A Service Guide 4-23...
  • Page 96 . 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. 4-24 Keysight N5224A/25A Service Guide...
  • Page 97 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. Keysight N5224A/25A Service Guide 4-25...
  • Page 98 2 on the other end of the cable. 3. Insulate all exposed wires so that they cannot short together. 4. Label this as a crossover cable so that it cannot be confused with a standard cable. 4-26 Keysight N5224A/25A Service Guide...
  • Page 99 Troubleshooting Rear Panel Troubleshooting Figure 4-5 Construction of a Crossover Cable Keysight N5224A/25A Service Guide 4-27...

  • Page 100: 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. 4-28 Keysight N5224A/25A Service Guide...

  • Page 101: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)

    A23 test set motherboard. Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode) The first step is to verify that the A, B,C, D, and R traces are present and that they are approximately level: Keysight N5224A/25A Service Guide 4-29...
  • Page 102 — 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 4-8. Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly. 4-30 Keysight N5224A/25A Service Guide...

  • Page 103: Where To Begin Troubleshooting

    Proceed to “Where to Begin Troubleshooting.” Where to Begin Troubleshooting For the purposes of troubleshooting, the analyzer block diagram is divided into the following functional groups: — the source and LO group Keysight N5224A/25A Service Guide 4-31...
  • Page 104 Address box, click the down arrow and then click My Computer. In an open area of the My Computer window, click the right mouse button and then click Properties in the resulting pop-up menu. 4-32 Keysight N5224A/25A Service Guide...
  • Page 105 Click the Hardware tab, click Device Manager, and then expand Keysight PNA DSP Device in the resulting list. The following entry should be listed: Keysight Technologies DSP Driver #2 and should be enabled. 2. If the entry is not present or if the icon to the left of the name is a...

  • Page 106: Checking The Source Group

    Too many sections!Equipment Used for This Check Equipment Type Model or Alternate Model or Part Number Part Number Power meter E4418B/E4419B E4418A/E4419A Power sensor, 2.4 mm E8487A None Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007 4-34 Keysight N5224A/25A Service Guide...
  • Page 107 — for LO related problems, continue testing at “Checking the A15 13.5 GHz LO Synthesizer Output”. — for source related problems, continue testing at “Checking the A4 and A17 Source Synthesizer Outputs” on page 4-37. Keysight N5224A/25A Service Guide 4-35...
  • Page 108 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. 4-36 Keysight N5224A/25A Service Guide...
  • Page 109 2. Disconnect W1 or W2 from J1207. 3. Connect the spectrum analyzer to J1207. 4. Set the network analyzer for an 800 MHz CW frequency and observe the spectrum analyzer measurement. An 800 MHz signal should be present. Keysight N5224A/25A Service Guide 4-37...
  • Page 110 Refer to “Removing and Replacing the A4–A17 Boards” on page 7-14. 7. If the signal is present, reconnect all cables, and then continue with “Checking the A7, A8, A12, and A13 50 GHz Doubler Outputs”. 4-38 Keysight N5224A/25A Service Guide...

  • Page 111: 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 N5224A/25A Service Guide 4-39...
  • Page 112 , 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. 4-40 Keysight N5224A/25A Service Guide...
  • Page 113 — A29, A30, A31, or A32 receiver coupler — A38, A39, A40, or A41 source step attenuator — A42, A43, A44, or A45 bias tee — A33, A34, A35, and A36 test port coupler Keysight N5224A/25A Service Guide 4-41...
  • Page 114 5. If the 800 MHz signal is present and the analyzer has source attenuators and bias tees, reconnect the cable to the receiver coupler and continue testing at “Checking the A38, A39, A40, and A41 60-dB Source Step Attenuators” on page 4-43 4-42 Keysight N5224A/25A Service Guide...

  • Page 115: Checking The Receiver Group

    “Bottom RF Cables, Standard 2-Port Configuration, Option 200” on page 6-24 — “2-Port Configuration, Option 219” on page 6-47 — “Bottom RF Cables, 2-Port, Option 219” on page 6-49 — “4-Port Configuration, Option 400” on page 6-54 Keysight N5224A/25A Service Guide 4-43...
  • Page 116 — 2-port models — Receiver A; W61 of A27 — Receiver R1; W62 of A27 — Receiver R2; W63 of A27 — Receiver B; W64 of A27 — 4-port models — Receiver A; W61 of A27 4-44 Keysight N5224A/25A Service Guide...
  • Page 117 Checking the A46, A47, A48, and A49 35-dB Receiver Step Attenuators 1. Locate the appropriate semirigid cable at the output of the receiver step attenuator to be checked: — Options 219 and 419 — Port 1; W98 of A46 Keysight N5224A/25A Service Guide 4-45...
  • Page 118 7.61 MHz (analyzers with DSP version 4.0), or 7.44 MHz (analyzers with DSP version 5.0), and 1 GHz. 5. If the measured signal is present, replace the A16 SPAM board. Refer to “Removing and Replacing the A4–A17 Boards” on page 7-14. 4-46 Keysight N5224A/25A Service Guide...
  • Page 119 Troubleshooting Measurement System Troubleshooting 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 7-30. Keysight N5224A/25A Service Guide 4-47...

  • Page 120: Instrument Block Diagrams Sheet 1

    Troubleshooting Instrument Block Diagrams Sheet 1 Instrument Block Diagrams Sheet 1 Microwave PNA, N522xA 4-48 Keysight N5224A/25A Service Guide...
  • Page 121 N5224A/25A 2-Port Overall Block Diagram (Includes Options 200-Standard; 201-Configurable Test Set; 217-Attenuators; and 219-Bias Tees) Service Guide: N5225-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz OPTION 200 OR 210 ADC MODULE (SPAM) IF = 7.438 MHz for CW Freq >...

  • Page 122: Instrument Block Diagrams Sheet 2

    Troubleshooting Instrument Block Diagrams Sheet 2 Instrument Block Diagrams Sheet 2 Microwave PNA, N522xA 4-50 Keysight N5224A/25A Service Guide...
  • Page 123 N5224A/25A 4-Port Overall Block Diagram (Includes Options 400-Standard; 401-Configurable Test Set; 4 17-Attenuators; and 419-Bias Tees Service Guide: N5225-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz OPTION 400 OR 410 ADC MODULE (SPAM) IF = 7.438 MHz for CW Freq >...
  • Page 124 Troubleshooting Instrument Block Diagrams Sheet 2 4-52 Keysight N5224A/25A Service Guide...

  • Page 125: 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 126: 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 N5224A/25A Service Guide...

  • Page 127: 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 N5224A/25A Service Guide...
  • Page 128 Refer to “Signal Separation Group Operation” on page 5-17. 1. For frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the Data Sheet and Technical Specifications documents (see hyperlinks above). Keysight N5224A/25A Service Guide...
  • Page 129 “Digital Processing and Digital Control Group Operation” on page 5-27. Power Supply Group The power supply functional group provides power for the other assemblies in the instrument. Refer to “Power Supply Group Operation” on page 5-32. Keysight N5224A/25A Service Guide...

  • Page 130: Synthesized Source Group Operation

    53 MHz when the IF is 0.826 MHz. This IF signal is sent to the A16 SPAM board for digital processing. 1. For frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the Data Sheet and Technical Specifications documents (see hyperlinks above). Keysight N5224A/25A Service Guide...
  • Page 131 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. Keysight N5224A/25A Service Guide...
  • Page 132 Theory of Operation Synthesized Source Group Operation Figure 5-3 Source Group Keysight N5224A/25A Service Guide...
  • Page 133 9.500 to 10.000 19.000 to 20.000 10.0037 to 10.6677 20.0074 to 21.3354 10.000 to 10.000 to 20.000 to 10.664 10.664 21.328 10.6677 to 12.0037 21.3354 to 24.0074 4.000 to 5.332 4.000 to 5.332 21.328 to 24.000 Keysight N5224A/25A Service Guide...

  • Page 134: A4, A15, And A17 13.5 Ghz Synthesizer Boards

    In band 6, the output of the swept VCO is passed through a divide-by-4 circuit and then sent to a Direct Digital Synthesizer to produce the output frequencies for bands 2-4 as listed in Table 5-3. 5-10 Keysight N5224A/25A Service Guide...

  • Page 135: A5 And A10 26.5 Ghz Source Boards

    A5 and A10 source module P4 outputs. These signals are amplified by the A7 and A12 doubler boards and output via the highband output ports to the highband input ports on the A8 and A13 doubler boards. Keysight N5224A/25A Service Guide 5-11...

  • Page 136: A25 Multiplier/Amplifier 26.5 Board (Hma26.5)

    10 MHz reference signal for the A16 signal processing ADC module (SPAM) board. The VCO output is also divided by two to produce 50 MHz reference signals for the A4, A15, and A17 13.5 GHz synthesizer boards. 5-12 Keysight N5224A/25A Service Guide...

  • Page 137: A23 Test Set Motherboard

    Connector settings can be changed using SCPI and COM commands. The settings are not accessible from the front panel. PWR I/O A DB-9 female connector. Pin assignments are listed in Table 5-6 on page 5-16. Keysight N5224A/25A Service Guide 5-13...
  • Page 138 TTL out, test set select bit 3, tied to 0 V 19–21 AD7–5 TTL I/O, address and latched data 22–23 AD0–1 TTL I/O, address and latched data TTL out, active low data strobe (1 μs min) TTL out, high = read, low = write 5-14 Keysight N5224A/25A Service Guide...
  • Page 139 TTL out, latched, indicates pass fail (programmable polarity) +5 V +5 Vdc, 100 mA max. Sweep End TTL out, active low (10 μs min) indicates sweep done Pass/Fail Write TTL out, active low pass/fail write strobe (1 μs min) Strobe Keysight N5224A/25A Service Guide 5-15...
  • Page 140 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. 5-16 Keysight N5224A/25A Service Guide...

  • Page 141: Signal Separation Group Operation

    — the A31 port 4 receiver coupler and the A35 test port 4 coupler — the A32 port 2 receiver coupler and the A36 test port 2 coupler — the A33 test port 1 coupler and the A27 mixer brick receiver A Keysight N5224A/25A Service Guide 5-17...

  • Page 142: A29-A32 Receiver Couplers

    A, B, C, and D for 4-port models or inputs A and B for 2-port models. The coupling coefficient of the directional couplers is nominally 15 dB for all frequencies above 500 MHz. The coupling coefficient increases for frequencies below 500 MHz. 5-18 Keysight N5224A/25A Service Guide...

  • Page 143: A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees

    5-dB steps. They adjust the power level to the DUT without changing the level of the incident power in the reference path. These attenuators are controlled by the A21 CPU board. The bias tees are to provide DC biasing for the DUT. Keysight N5224A/25A Service Guide 5-19...
  • Page 144 Theory of Operation Signal Separation Group Operation Figure 5-4 4-Port Signal Separation Group 5-20 Keysight N5224A/25A Service Guide...
  • Page 145 Theory of Operation Signal Separation Group Operation Figure 5-5 2-Port Signal Separation Group Keysight N5224A/25A Service Guide 5-21...

  • Page 146: 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 5-22 Keysight N5224A/25A Service Guide...

  • Page 147: 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. Keysight N5224A/25A Service Guide 5-23...
  • Page 148 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 5-24 Keysight N5224A/25A Service Guide...
  • Page 149 Theory of Operation Receiver Group Operation Figure 5-6 4-Port Receiver Group Keysight N5224A/25A Service Guide 5-25...
  • Page 150 Theory of Operation Receiver Group Operation Figure 5-7 2-Port Receiver Group 5-26 Keysight N5224A/25A Service Guide...

  • Page 151: 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) Keysight N5224A/25A Service Guide 5-27...
  • Page 152 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-8 Digital Processing and Digital Control Group 5-28 Keysight N5224A/25A Service Guide...

  • Page 153: 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 Keysight N5224A/25A Service Guide 5-29...

  • Page 154: 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. 5-30 Keysight N5224A/25A Service Guide...
  • Page 155 The SSD is a Serial Advanced Technology Attachment (SATA) data storage device which is connected directly to, and physically mounted within the enclosure of, the A21 CPU board. The full operating system and firmware for the network analyzer is stored on the A55 SSD. Keysight N5224A/25A Service Guide 5-31...

  • Page 156: Power Supply Group Operation

    The +15 V standby supply remains on continuously whenever the power supply is plugged in. This supply is used to provide power to front panel LEDs and CPU components when the analyzer is turned off. 5-32 Keysight N5224A/25A Service Guide...

  • Page 157: Replaceable Parts

    Rebuilt-Exchange Assemblies The definition of a rebuilt-exchange assembly. page 6-4 The procedure for replacing and returning a defective assembly to Keysight Technologies. Replaceable Parts Listings Tables that list the assemblies by reference designator with page 6-6 their associated part number and description.

  • Page 158: 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 159: Assembly Replacement Sequence

    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 N5224A/25A Service Guide...

  • Page 160: 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 N5224A/25A Service Guide...
  • Page 161 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5224A/25A Service Guide...

  • Page 162: Replaceable Parts Listings

    Doubler 3 board Doubler 4 board Frequency reference board 13.5 GHz (LO) synthesizer board Signal processing ADC module (SPAM) board 13.5 GHz source 2 synthesizer board System motherboard Midplane board Power supply CPU board GPIB board Keysight N5224A/25A Service Guide...
  • Page 163 Port 2 bias tee Port 1 receiver step attenuator Port 3 receiver step attenuator Port 4 receiver step attenuator Port 2 receiver step attenuator Hard disk drive “Top Assemblies and Cables, All Options” on page 6-16 Keysight N5224A/25A Service Guide...
  • Page 164 “Top Hardware and Miscellaneous Parts, All Options” on page 6-98 — “Bottom Hardware and Miscellaneous Parts” on page 6-100 — “Internal Hardware and Miscellaneous Parts, All Options” on page 6-103 — “External Hardware and Miscellaneous Parts, All Options” on page 6-105 Keysight N5224A/25A Service Guide...
  • Page 165 Fuses on page 6-107 — Battery on page 6-107 — Analyzer Accessories on page 6-108 — USB Accessories on page 6-108 — ESD Supplies on page 6-108 — Rack Mount Kits and Handle Kits on page 6-108 Keysight N5224A/25A Service Guide...

  • Page 166: Front Panel Assembly, Front Side, All Options

    N5225-80001 Nameplate, N5225A ➈ 0515-1946 Machine screw, M3.0 x 6, 90-deg flat head (To attach front fame to sub panel.) (Only 2 used on 2-port, all 4 used on 4-port.) Not shown 5023-1399 Front handle 6-10 Keysight N5224A/25A Service Guide...
  • Page 167 Replaceable Parts Replaceable Parts Listings a. Refer to “Rack Mount Kits and Handle Kits” on page 6-108 for part numbers of complete rack mount kits. Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5224A/25A Service Guide 6-11...

  • Page 168: Front Panel Assembly, Back Side, All Options

    8121-1451 Power switch cable harness 1400-0510 Cable clamp (with adhesive backing) 0515-0667 Machine screw, M3.0 x 25 pan head (To attach display to front frame.) 2190-0017 Lock washer, helical #8 (To use with 0515-0667 screw.) 6-12 Keysight N5224A/25A Service Guide...
  • Page 169 Associated parts are indicated in this table with either “Tube” or “LED.” If you replace an old part number <des- ignated “Tube”> with its new part number <designated “LED”>, you must also replace ALL of the other old part numbers <designated “Tube”> in the table with their new part numbers <designated “LED”>. Keysight N5224A/25A Service Guide 6-13...
  • Page 170 Replaceable Parts Replaceable Parts Listings Figure 6-3 Front Panel Assembly, Back Side, All Options Figure 6-4 A3 Display Assembly with Old LCD Display 2090-0883 6-14 Keysight N5224A/25A Service Guide...
  • Page 171 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Keysight N5224A/25A Service Guide 6-15...

  • Page 172: Top Assemblies And Cables, All Options

    6 Solid state drive assembly (SSDA) for Windows 7 Operating System - N8983A to be used with the 2.0 GHz CPU board W1312-60196, System CPU version 6 ➀ 1420-0356 Battery, lithium manganese dioxide, 3V, 0.22A-hr. 6-16 Keysight N5224A/25A Service Guide...
  • Page 173 For more information on the N8983A SSD, refer to the Windows 7 Operating System Upgrade Kit Installation Note, available online at http://literature.cdn.keysight.com/litweb/pdf/N8983-90001.pdf. e. The lithium battery is located inside the A21 CPU board assembly. Refer to “Removing and Replacing the Lithium Battery” on page 7-57 for an illustration. Keysight N5224A/25A Service Guide 6-17...
  • Page 174 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Options 6-18 Keysight N5224A/25A Service Guide...
  • Page 175 A14 frequency reference board J6 to A4 13.5 GHz (source 1) synthesizer board J5 (Located on bottom of board.) N5242-60030 A14 frequency reference board J7 to A17 13.5 GHz (source 2) synthesizer board J5 (Located on bottom of board.) (4-port only.) Keysight N5224A/25A Service Guide 6-19...
  • Page 176 A24 IF multiplexer board P203 to A16 SPAM board J5 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-20 Keysight N5224A/25A Service Guide...
  • Page 177 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Cables—All Options Keysight N5224A/25A Service Guide 6-21...

  • Page 178: Port Configuration, Option 200

    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. 6-22 Keysight N5224A/25A Service Guide...
  • Page 179 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, Standard 2-Port Configuration, Option 200 Keysight N5224A/25A Service Guide 6-23...
  • Page 180 A27 mixer brick (B) to A24 IF multiplexer (P201) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. N5245-20048 A25 HMA26.5 to A27 mixer brick a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-24 Keysight N5224A/25A Service Guide...
  • Page 181 Replaceable Parts Replaceable Parts Listings Figure 6-9 Bottom RF Cables, Standard 2-Port Configuration, Option 200 Keysight N5224A/25A Service Guide 6-25...
  • Page 182 A18 system motherboard J13 to A23 test set motherboard J545 ➇ 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 6-26 Keysight N5224A/25A Service Guide...
  • Page 183 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Keysight N5224A/25A Service Guide 6-27...

  • Page 184: Port Configuration, Option 201

    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. 6-28 Keysight N5224A/25A Service Guide...
  • Page 185 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, 2-Port, Option 201 Keysight N5224A/25A Service Guide 6-29...
  • Page 186 A27 mixer brick (B) to A24 IF multiplexer (P201) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. N5245-20048 A25 HMA26.5 to A27 mixer brick a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-30 Keysight N5224A/25A Service Guide...
  • Page 187 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom RF Cables, 2-Port, Option 201 Keysight N5224A/25A Service Guide 6-31...
  • Page 188 A18 system motherboard J13 to A23 test set motherboard J545 ➈ 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 6-32 Keysight N5224A/25A Service Guide...
  • Page 189 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 201 Keysight N5224A/25A Service Guide 6-33...

  • Page 190: Port Configuration, Option 210

    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. 6-34 Keysight N5224A/25A Service Guide...
  • Page 191 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Assemblies, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-35...
  • Page 192 A27 mixer brick (B) to A24 IF multiplexer (P201) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. N5245-20048 A25 HMA26.5 to A27 mixer brick a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-36 Keysight N5224A/25A Service Guide...
  • Page 193 Replaceable Parts Replaceable Parts Listings Figure 6-15 Bottom RF Cables, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-37...
  • Page 194 A18 system motherboard J13 to A23 test set motherboard J545 ➇ 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 6-38 Keysight N5224A/25A Service Guide...
  • Page 195 Replaceable Parts Replaceable Parts Listings Figure 6-16 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 210 Keysight N5224A/25A Service Guide 6-39...

  • Page 196: Port Configuration, Option 217

    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. 6-40 Keysight N5224A/25A Service Guide...
  • Page 197 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom Assemblies, 2-Port, Option 217 Keysight N5224A/25A Service Guide 6-41...
  • Page 198 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) 6-42 Keysight N5224A/25A Service Guide...
  • Page 199 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224A/25A Service Guide 6-43...
  • Page 200 Replaceable Parts Replaceable Parts Listings Figure 6-18 Bottom RF Cables, 2-Port, Option 217 6-44 Keysight N5224A/25A Service Guide...
  • Page 201 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 N5224A/25A Service Guide 6-45...
  • Page 202 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 217 6-46 Keysight N5224A/25A Service Guide...

  • Page 203: Port Configuration, Option 219

    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 N5224A/25A Service Guide 6-47...
  • Page 204 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom Assemblies, 2-Port, Option 219 6-48 Keysight N5224A/25A Service Guide...
  • Page 205 N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20030 Front-panel Port 2 CPLR THRU to A45 port 2 bias tee N5245-20047 A36 port 2 coupler to A45 port 2 bias tee Keysight N5224A/25A Service Guide 6-49...
  • Page 206 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-50 Keysight N5224A/25A Service Guide...
  • Page 207 Replaceable Parts Replaceable Parts Listings Figure 6-21 Bottom RF Cables, 2-Port, Option 219 Keysight N5224A/25A Service Guide 6-51...
  • Page 208 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 6-52 Keysight N5224A/25A Service Guide...
  • Page 209 Replaceable Parts Replaceable Parts Listings Figure 6-22 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219 Keysight N5224A/25A Service Guide 6-53...

  • Page 210: Port Configuration, Option 400

    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 N5224A/25A Service Guide...
  • Page 211 Replaceable Parts Replaceable Parts Listings Figure 6-23 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Keysight N5224A/25A Service Guide 6-55...
  • Page 212 A27 mixer brick (B) to A24 IF multiplexer (P201) N5242-60024 A28 mixer brick (D) to A24 IF multiplexer (P801) N5242-60019 A28 mixer brick (R4) to A24 IF multiplexer (P414) N5242-60020 A28 mixer brick (R3) to A24 IF multiplexer (P413) 6-56 Keysight N5224A/25A Service Guide...
  • Page 213 A28 mixer brick (C) to A24 IF multiplexer (P601) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. ➀ N5247-20138 Dust cap, A28 mixer brick termination a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224A/25A Service Guide 6-57...
  • Page 214 Replaceable Parts Replaceable Parts Listings Figure 6-24 Bottom RF Cables, Standard 4-Port Configuration, Option 400 6-58 Keysight N5224A/25A Service Guide...
  • Page 215 A18 system motherboard J13 to A23 test set motherboard J545 ➈ 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 N5224A/25A Service Guide 6-59...
  • Page 216 Replaceable Parts Replaceable Parts Listings Figure 6-25 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 6-60 Keysight N5224A/25A Service Guide...

  • Page 217: Port Configuration, Option 401

    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 N5224A/25A Service Guide 6-61...
  • Page 218 Replaceable Parts Replaceable Parts Listings Figure 6-26 Bottom Assemblies, 4-Port, Option 401 6-62 Keysight N5224A/25A Service Guide...
  • Page 219 Port 2 RCVR B IN to A27 mixer brick (B) N5245-20007 A37 reference mixer switch to front-panel REF 1 SOURCE OUT N5245-20006 REF 1 RCVR R1 IN to A37 reference mixer switch N5245-20009 A37 reference mixer switch to A27 mixer brick (R1) Keysight N5224A/25A Service Guide 6-63...
  • Page 220 A28 mixer brick (R3) to A24 IF multiplexer (P413) N5242-60023 A28 mixer brick (C) to A24 IF multiplexer (P601) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. ➀ N5247-20138 Dust cap, A28 mixer brick termination 6-64 Keysight N5224A/25A Service Guide...
  • Page 221 Replaceable Parts Replaceable Parts Listings Figure 6-27 Bottom RF Cables, 4-Port, Option 401 Keysight N5224A/25A Service Guide 6-65...
  • Page 222 A18 system motherboard J13 to A23 test set motherboard J545 ➉ 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 6-66 Keysight N5224A/25A Service Guide...
  • Page 223 Replaceable Parts Replaceable Parts Listings Figure 6-28 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 401 Keysight N5224A/25A Service Guide 6-67...

  • Page 224: Port Configuration, Option 410

    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. 6-68 Keysight N5224A/25A Service Guide...
  • Page 225 Replaceable Parts Replaceable Parts Listings Figure 6-29 Bottom Assemblies, 4-Port, Option 410 Keysight N5224A/25A Service Guide 6-69...
  • Page 226 A27 mixer brick (R2) to A24 IF multiplexer (P412) N5242-60018 A27 mixer brick (B) to A24 IF multiplexer (P201) N5242-60024 A28 mixer brick (D) to A24 IF multiplexer (P801) N5242-60019 A28 mixer brick (R4) to A24 IF multiplexer (P414) 6-70 Keysight N5224A/25A Service Guide...
  • Page 227 A28 mixer brick (C) to A24 IF multiplexer (P601) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-19. ➀ N5247-20138 Dust cap, A28 mixer brick termination a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224A/25A Service Guide 6-71...
  • Page 228 Replaceable Parts Replaceable Parts Listings Figure 6-30 Bottom RF Cables, 4-Port, Option 410 6-72 Keysight N5224A/25A Service Guide...
  • Page 229 A18 system motherboard J13 to A23 test set motherboard J545 ➈ 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 N5224A/25A Service Guide 6-73...
  • Page 230 Replaceable Parts Replaceable Parts Listings Figure 6-31 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 410 6-74 Keysight N5224A/25A Service Guide...

  • Page 231: Port Configuration, Option 417

    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 N5224A/25A Service Guide 6-75...
  • Page 232 Replaceable Parts Replaceable Parts Listings Figure 6-32 Bottom Assemblies, 4-Port, Option 417 6-76 Keysight N5224A/25A Service Guide...
  • Page 233 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 Keysight N5224A/25A Service Guide 6-77...
  • Page 234 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-78 Keysight N5224A/25A Service Guide...
  • Page 235 Replaceable Parts Replaceable Parts Listings Figure 6-33 Bottom RF Cables, 4-Port, Option 417 (Ports 1 and 2) Keysight N5224A/25A Service Guide 6-79...
  • Page 236 Port 4 RCVR D IN to A48 port 4 receiver attenuator W102 N5245-20075 A48 port 4 receiver attenuator to A28 mixer brick (D) ➀ N5247-20138 Dust cap, A28 mixer brick termination a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-80 Keysight N5224A/25A Service Guide...
  • Page 237 Replaceable Parts Replaceable Parts Listings Figure 6-34 Bottom RF Cables, 4-Port, Option 417 (Ports 3 and 4) Keysight N5224A/25A Service Guide 6-81...
  • Page 238 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 6-82 Keysight N5224A/25A Service Guide...
  • Page 239 Replaceable Parts Replaceable Parts Listings Figure 6-35 Bottom Ribbon Cables & Wire Harnesses, 4-Port, Option 417 Keysight N5224A/25A Service Guide 6-83...

  • Page 240: Port Configuration, Option 419

    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. 6-84 Keysight N5224A/25A Service Guide...
  • Page 241 Replaceable Parts Replaceable Parts Listings Figure 6-36 Bottom Assemblies, 4-Port, Option 419 Keysight N5224A/25A Service Guide 6-85...
  • Page 242 N5245-20029 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 N5245-20030 Port 2 CPLR THRU to A45 port 2 bias tee 6-86 Keysight N5224A/25A Service Guide...
  • Page 243 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224A/25A Service Guide 6-87...
  • Page 244 Replaceable Parts Replaceable Parts Listings Figure 6-37 Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2) 6-88 Keysight N5224A/25A Service Guide...
  • Page 245 Port 4 RCVR D IN to A48 port 4 receiver attenuator W102 N5245-20075 A48 port 4 receiver attenuator to A28 mixer brick (D) ➀ N5247-20138 Dust cap, A28 mixer brick termination a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5224A/25A Service Guide 6-89...
  • Page 246 Replaceable Parts Replaceable Parts Listings Figure 6-38 Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4) 6-90 Keysight N5224A/25A Service Guide...
  • Page 247 A23 test set motherboard J209 to A25 HMA26.5 J1 Was N5242-60011 100R N5242-60004 A18 system motherboard J1 to A23 test set motherboard J1 to A24 IF multiplexer board J1 E4410-60160 A18 system motherboard J13 to A23 test set motherboard J545 Keysight N5224A/25A Service Guide 6-91...
  • Page 248 Replaceable Parts Listings Reference Part Number Description Type Designator 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 6-92 Keysight N5224A/25A Service Guide...
  • Page 249 Replaceable Parts Replaceable Parts Listings Figure 6-39 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419 Keysight N5224A/25A Service Guide 6-93...

  • Page 250: Rear Panel Assembly, All Options

    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 6-105.) 6-94 Keysight N5224A/25A Service Guide...
  • Page 251 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 6-40 Rear Panel Assembly, All Options Keysight N5224A/25A Service Guide 6-95...

  • Page 252: Fan Assemblies, All Options

    5 to attach the 3-fan assy to chassis.) ➅ Chassis (Refer to “Internal Hardware and Miscellaneous Parts, All Options” on page 6-103.) ➆ E4440-00021 EMI shield, round, adhesive. (Located on center hub of 2 fans only.) 6-96 Keysight N5224A/25A Service Guide...
  • Page 253 Replaceable Parts Replaceable Parts Listings Figure 6-41 Fan Assemblies, Side View, All Options Keysight N5224A/25A Service Guide 6-97...

  • Page 254: Top Hardware And Miscellaneous Parts, All Options

    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). 6-98 Keysight N5224A/25A Service Guide...
  • Page 255 Replaceable Parts Replaceable Parts Listings Figure 6-42 Top Hardware and Miscellaneous Parts, Top View, All Options Keysight N5224A/25A Service Guide 6-99...

  • Page 256: Bottom Hardware And Miscellaneous Parts

    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.) 6-100 Keysight N5224A/25A Service Guide...
  • Page 257 Stabilizer bracket (Between A23 test set motherboard and A24 IF mux board.) 0460-2725 Coupler vibration mount (Between port 1 & port 2 couplers & test set front sub panel.) N5242-00029 Protective guard for front panel jumpers N5242-00030 Protective guard for front panel jumpers (4-port models only.) Keysight N5224A/25A Service Guide 6-101...
  • Page 258 Replaceable Parts Replaceable Parts Listings Figure 6-43 Bottom Hardware and Miscellaneous Parts 6-102 Keysight N5224A/25A Service Guide...

  • Page 259: Internal Hardware And Miscellaneous Parts, All Options

    ➅ N5247-00013 Front bracket ➆ N5242-40002 PC board guides Keysight N5224A/25A Service Guide 6-103...
  • Page 260 Replaceable Parts Replaceable Parts Listings Figure 6-44 Internal Hardware and Miscellaneous Parts, All Options 6-104 Keysight N5224A/25A Service Guide...

  • Page 261: External Hardware And Miscellaneous Parts, All Options

    Machine screw, M3.0 x 8, pan head (To attach inner cover.) ➈ N5247-00004 Inner cover (retaining shield) ➉ 0515-1227 Machine screw, M3.0 x 6, flat head (To attach inner cover.) Not shown N5245-40001 Front impact cover Not shown N5245-40002 Rear impact cover Keysight N5224A/25A Service Guide 6-105...
  • Page 262 1/4 inch and 5/16 inch open-end wrench, thin profile 8710-0510 5/16 inch (8 mm), open-end wrench 8710-2174 1/2 inch to 9/16 inch (8 mm), open-end wrench 8710-1770 20 mm open-end torque wrench; 0.9 N-m (8 in-lb) 8710-1764 Spanner wrench 08513-20014 Documentation 6-106 Keysight N5224A/25A Service Guide...
  • Page 263 Protective guard for center two sets of front panel jumpers N5242-00030 Fuses Rear Panel Bias Input Fuse; Ports 1, 2, 3, and 4 (0.5 A, 125 V) 2110-0824 Was 2110-0046 Battery Battery, lithium manganese dioxide, 3V, 0.22A-hr. (located on A21 CPU board assembly) 1420-0356 Keysight N5224A/25A Service Guide 6-107...
  • Page 264 N5232AU-1CP or N5239AU-1CP Option 1CP includes the following separately orderable items: Rack mount kit (rack mount flanges and hardware) 5063-9237 Rack mount rail set E3663AC 5063-9230 Front handle kit (two classic handles and hardware) Touch-up Paint 6-108 Keysight N5224A/25A Service Guide...
  • Page 265 Parchment white (for use on rack mount flanges, rack support flanges, and front 6010-1148 panels) a. For rack mount use, you must replace factory installed ruggedized handles (thick aluminum, no trim) with classic handles (thin aluminum with plastic trim), included with Option 1CP. Keysight N5224A/25A Service Guide 6-109...
  • Page 266 Replaceable Parts Replaceable Parts Listings 6-110 Keysight N5224A/25A Service Guide...

  • Page 267: Information In This Chapter

    2-Port and 4-Port PNA Series Service Guide Repair and Replacement Procedures 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 268: Personal Safety Warnings

    The front panel switch is only a standby switch and is not a LINE switch (disconnecting device). Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to manufacturer’s instructions. Keysight N5224A/25A Service Guide...

  • Page 269: Electrostatic Discharge (Esd) Protection

    To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-7, for all of the procedures in this chapter. Keysight N5224A/25A Service Guide...

  • Page 270: Removal And Replacement Procedures

    Port 3 receiver coupler Port 4 receiver coupler Port 2 receiver coupler Port 1 test port coupler page 7-40 Port 3 test port coupler Port 4 test port coupler Port 2 test port coupler Reference mixer switch page 7-43 Keysight N5224A/25A Service Guide...
  • Page 271 Port 4 bias tee Port 2 bias tee Port 1 receiver step attenuator page 7-45 Port 3 receiver step attenuator Port 4 receiver step attenuator Port 2 receiver step attenuator Solid State drive (SSD) page 7-49 Keysight N5224A/25A Service Guide...

  • Page 272: Removing The Covers

    Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5224A/25A Service Guide...
  • Page 273 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5224A/25A Service Guide...

  • Page 274: Removing And Replacing The Front Panel Assembly

    When reconnecting the front-panel jumpers, torque the connectors to 10 in-lb. 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide...
  • Page 275 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal Keysight N5224A/25A Service Guide...

  • Page 276: Removing And Replacing The A1–A3 And Other Front Panel Subassemblies

    Removing the Inverter Board ③ ⑧ 1. Disconnect the inverter board cable (item ) and the LCD cable (item from the inverter board. ⑨ 2. Remove two screws (item ) and remove the inverter board. 7-10 Keysight N5224A/25A Service Guide...
  • Page 277 ③ ④ controller board cable (item ), and power switch cable (item ⑤ 2. Remove seven screws (item ) from the A3 display assembly and remove the A3 display assembly from the front panel assembly. Keysight N5224A/25A Service Guide 7-11...
  • Page 278 (item ) that attach it ⑧ to the LCD display hold down bracket (item ). Note the location of the ⑩ four spacers (item ) before separating the LCD display from the hold down bracket. 7-12 Keysight N5224A/25A Service Guide...
  • Page 279 A3 Display Assembly and Touch Screen Removal-2 Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide 7-13...

  • Page 280: Removing And Replacing The A4–A17 Boards

    ), one at each end of the board, and lift the board. d. Before removing the board, check the bottom of the board for any attached cables. Replacement Procedure 1. Reverse the order of the removal procedure. 7-14 Keysight N5224A/25A Service Guide...
  • Page 281 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 7-59. Keysight N5224A/25A Service Guide 7-15...
  • Page 282 Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards Figure 7-6 A4, A5, A7, A8, A10, A12, A13, A14, A15, A16, and A17 Boards Removal 7-16 Keysight N5224A/25A Service Guide...

  • Page 283: Removing And Replacing The A18 System Motherboard

    ) from each side that secure the midplane bracket to the chassis inner panels. Lift the midplane bracket out of the analyzer. ④ 17. Remove the three screws (item ) that secure the front bracket to the chassis left inner panel. Keysight N5224A/25A Service Guide 7-17...
  • Page 284 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 7-59. 7-18 Keysight N5224A/25A Service Guide...
  • Page 285 Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard Figure 7-7 A18 System Motherboard Removal Keysight N5224A/25A Service Guide 7-19...

  • Page 286: Removing And Replacing The A19 Midplane Board

    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 7-59. 7-20 Keysight N5224A/25A Service Guide...
  • Page 287 Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Figure 7-8 A19 Midplane Board Removal Keysight N5224A/25A Service Guide 7-21...

  • Page 288: Removing And Replacing The A20 Power Supply Assembly

    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 7-59. 7-22 Keysight N5224A/25A Service Guide...
  • Page 289 Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Figure 7-9 A20 Power Supply Assembly Removal Keysight N5224A/25A Service Guide 7-23...

  • Page 290: Removing And Replacing The A21 Cpu Board Assembly

    (SSD)” on page 7-49. 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 7-59. 7-24 Keysight N5224A/25A Service Guide...
  • Page 291 Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Figure 7-10 A21 CPU Board Assembly Removal Keysight N5224A/25A Service Guide 7-25...

  • Page 292: Removing And Replacing The A22 Gpib Board

    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 7-59. 7-26 Keysight N5224A/25A Service Guide...
  • Page 293 Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Figure 7-11 A22 GPIB Board Removal Keysight N5224A/25A Service Guide 7-27...

  • Page 294: Removing And Replacing The A23 Test Set Motherboard

    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 7-59. 7-28 Keysight N5224A/25A Service Guide...
  • Page 295 Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard Figure 7-12 A23 Test Set Motherboard Removal Keysight N5224A/25A Service Guide 7-29...

  • Page 296: Removing And Replacing The A24 If Multiplexer Board

    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 7-59. 7-30 Keysight N5224A/25A Service Guide...
  • Page 297 Repair and Replacement Procedures Removing and Replacing the A24 IF Multiplexer Board Figure 7-13 A24 IF Multiplexer Board Removal Keysight N5224A/25A Service Guide 7-31...

  • Page 298: Removing And Replacing The A25 Hma26.5

    1. Reverse the order of the removal procedure. Torque all RF cable 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 7-59. 7-32 Keysight N5224A/25A Service Guide...
  • Page 299 Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Figure 7-14 A25 HMA26.5 Removal Keysight N5224A/25A Service Guide 7-33...

  • Page 300: Removing And Replacing The A26 Splitter

    1. Reverse the order of the removal procedure. 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 7-59. 7-34 Keysight N5224A/25A Service Guide...
  • Page 301 Repair and Replacement Procedures Removing and Replacing the A26 Splitter Figure 7-15 A26 Splitter Removal Keysight N5224A/25A Service Guide 7-35...

  • Page 302: Removing And Replacing The A27 And A28 Mixer Bricks

    Disconnect these cables and remove the mixer brick mounting block, with the mixer brick(s), the mixer brick shields, and the A26 splitter attached, from the analyzer. 8. If replacing a mixer brick: ⑤ a. Remove the two screws (item ) from each shield. 7-36 Keysight N5224A/25A Service Guide...
  • Page 303 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 7-59. Figure 7-16 A27 and A28 Mixer Bricks Removal Keysight N5224A/25A Service Guide 7-37...

  • Page 304: Brackets

    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 7-59. 7-38 Keysight N5224A/25A Service Guide...
  • Page 305 Repair and Replacement Procedures Removing and Replacing the A29–A32 Receiver Couplers and Receiver Coupler Mounting Brackets Figure 7-17 A29 through A32 receiver couplers Removal Keysight N5224A/25A Service Guide 7-39...

  • Page 306: Removing And Replacing The A33–A36 Test Port Couplers

    Replace the vibration ⑤ mount (item ) if necessary. Refer to “Bottom Hardware and Miscellaneous Parts” on page 6-100 for replacement part numbers. Torque all connectors to 10 in-lbs. Torque coupler nuts to 72 in-lbs. 7-40 Keysight N5224A/25A Service Guide...
  • Page 307 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide 7-41...
  • Page 308 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Figure 7-18 A33 through A36 Test Port Couplers Removal 7-42 Keysight N5224A/25A Service Guide...

  • Page 309: Removing And Replacing The A37 Reference Mixer Switch

    ) 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 7-59. Keysight N5224A/25A Service Guide 7-43...
  • Page 310 Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Figure 7-19 A37 Reference Mixer Switch Removal 7-44 Keysight N5224A/25A Service Guide...

  • Page 311: Attenuators

    1. Reverse the order of the removal procedure. Torque all cable connections to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide 7-45...
  • Page 312 Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Figure 7-20 Source and Receiver Attenuators 7-46 Keysight N5224A/25A Service Guide...

  • Page 313: Removing And Replacing The A42–A45 Bias Tees

    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 7-59. Keysight N5224A/25A Service Guide 7-47...
  • Page 314 Repair and Replacement Procedures Removing and Replacing the A42–A45 Bias Tees Figure 7-21 A42 through A45 Bias Tees Removal 7-48 Keysight N5224A/25A Service Guide...

  • Page 315: Removing And Replacing The A55 Solid State Drive (Ssd)

    1. Disconnect the analyzer power cord. 2. Position the analyzer for access to the rear panel. ① 3. Loosen the SSD assembly thumb screw (item 4. Pull the SSD assembly out from the CPU assembly, using the handle (item ➁ Keysight N5224A/25A Service Guide 7-49...
  • Page 316 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. 7-50 Keysight N5224A/25A Service Guide...

  • Page 317: Removing And Replacing The Rear Panel

    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 7-59. Keysight N5224A/25A Service Guide 7-51...
  • Page 318 Repair and Replacement Procedures Removing and Replacing the Rear Panel Figure 7-23 Rear Panel Removal 7-52 Keysight N5224A/25A Service Guide...

  • Page 319: Removing And Replacing The Front Panel Led Boards

    LED board from the analyzer. Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide 7-53...
  • Page 320 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards Figure 7-24 Front Panel LED Boards Removal 7-54 Keysight N5224A/25A Service Guide...

  • Page 321: Removing And Replacing The Fans

    ⑤ c. Pull out the rivet completely (as shown by (item ) in the illustration) to release the fan and fan guard. Replacement Procedure 1. Reverse the order of the removal procedure. Keysight N5224A/25A Service Guide 7-55...
  • Page 322 Repair and Replacement Procedures Removing and Replacing the Fans 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Figure 7-25 B1 Fan Removal 7-56 Keysight N5224A/25A Service Guide...

  • Page 323: Removing And Replacing The Lithium Battery

    1. Reverse the order of the removal procedure following all instructions included with the new battery. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-59. Keysight N5224A/25A Service Guide 7-57...
  • Page 324 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-26 Lithium Battery Removal 7-58 Keysight N5224A/25A Service Guide...

  • Page 325: Post-Repair Procedures

    A10 26.5 GHz source board Source Adjustment Source Power Accuracy Test IF Gain Adjustment Source Maximum Power Output Receiver Characterization Test Receiver Adjustment Source Power Linearity Test IF Response Adjustment (Option The Operator’s Check 090, 093, or 094 Only) Keysight N5224A/25A Service Guide 7-59...
  • Page 326 The Operator’s Check A19 midplane board No adjustment needed None needed A20 power supply assembly No adjustment needed None needed A21 CPU board No adjustment needed The Operator’s Check A22 GPIB board No adjustment needed None needed 7-60 Keysight N5224A/25A Service Guide...
  • Page 327 IF Response Adjustment (Option 090, 093, or 094 Only) A29–A32 receiver couplers Source Adjustment Source Maximum Power Output IF Gain Adjustment Test Receiver Characterization Calibration Coefficients Test Receiver Adjustment IF Response Adjustment (Option 090, 093, or 094 Only) Keysight N5224A/25A Service Guide 7-61...
  • Page 328 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 7-62 Keysight N5224A/25A Service Guide...

  • Page 329: Information In This Chapter

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide General Purpose Maintenance Procedures Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Error Terms How to use error terms as a preventive maintenance and page 8-2 troubleshooting tool.

  • Page 330: Error Terms

    You can use the error terms as a tool to isolate faulty assemblies in the signal separation group of your analyzer. You can compare the current values to preventive maintenance records or to the typical values listed in Table 8-1 on page 8-8. Keysight N5224A/25A Service Guide...

  • Page 331: Performing Measurement Calibration

    Figure 8-4 illustrate the error terms associated with measurement calibration for 1-port, 2-port, 3-port, and 4-port configurations respectively. Figure 8-1 Flowgraph of One-Port Error Terms for Port 1 where: E = Error term Subscript: D = Directivity Keysight N5224A/25A Service Guide...
  • Page 332 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) Keysight N5224A/25A Service Guide...
  • Page 333 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 N5224A/25A Service Guide...

  • Page 334: Accessing Error Terms

    Tracking error terms: S11 reflection tracking S12 transmission tracking S13 transmission tracking S12 transmission tracking There are eight isolation (crosstalk) terms not shown. Accessing Error Terms Error terms can be accessed either manually or programmatically: Manually Keysight N5224A/25A Service Guide...
  • Page 335 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 N5224A/25A Service Guide...

  • Page 336: Error Term Data

    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. Keysight N5224A/25A Service Guide...
  • Page 337 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 N5224A/25A Service Guide...
  • Page 338 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 4-43 or to “Checking the Signal Separation Group” on page 4-39. 8-10 Keysight N5224A/25A Service Guide...

  • Page 339: Option Enable Utility

    Using the current Host ID will cause a license to be generated that will not work with the instrument. To determine the new Host ID, use the utility at the below listed web site with the new model number. http://na.support.keysight.com/pna/upgrades.html Keysight N5224A/25A Service Guide 8-11...

  • Page 340: Enabling Or Removing Options

    4. If the desired option is not available in the list, select ??? - Enter Unlisted Option. A dialog box appears that will allow you to enter the option number. Enter the option number and follow the instructions on the display. 8-12 Keysight N5224A/25A Service Guide...

  • Page 341: Repairing And Recovering Option Data

    , then , then System Help About NA... b. Press UTILITY , then , then System 6. If the options are still not listed correctly, contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-7. Keysight N5224A/25A Service Guide 8-13...

  • Page 342: Installing Or Changing A Serial Number

    Keysight, enter the clear code in the space provided and click CLEAR. The correct serial number can then be entered. To change an incorrect serial number, a clear-code password is required. Contact Keysight to obtain the clear-code. Refer to “Contacting Keysight” on page 2-7. 8-14 Keysight N5224A/25A Service Guide...

  • Page 343: Firmware Upgrades

    — Press UTILITY , then , then Service AgileUpdate System AgileUpdate compares the firmware revision currently installed in your network analyzer to the latest version available and assists you in downloading and installing the most recent version. Keysight N5224A/25A Service Guide 8-15...

  • Page 344: Operating System Recovery

    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://na.support.keysight.com/pna/ The URL for the Hard Drive Recovery page is: http://na.support.keysight.com/pna/hdrecovery.html 8-16 Keysight N5224A/25A Service Guide...

  • Page 345: Correction Constants

    — Navigate to the EEPROM Backup Utility, located at: C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program. — Click Backup EEPROM. — Click Exit when the program has finished. Keysight N5224A/25A Service Guide 8-17...
  • Page 346 General Purpose Maintenance Procedures Correction Constants 8-18 Keysight N5224A/25A Service Guide...
  • Page 347 A20 power supply assembly procedure 7-14 illustrated 6-18 illustrated 6-18 troubleshooting 4-38 operation 5-10 operation 5-32 part number 6-16 part number 6-16 removal and replacement removal and replacement illustrated 7-16 illustrated 7-23 A receiver procedure 7-14 Keysight N5224A/25A Service Guide...
  • Page 348 , 6-54, 6-61, 6-68, procedure , 7-40, 7-42 procedure 6-75, 6-84 7-32 troubleshooting removal and replacement 4-42 troubleshooting 4-36 A36 test port 2 coupler illustrated A26 splitter 7-39 procedure illustrated 7-38 , 6-55, 6-62, 6-69, troubleshooting 6-76, 6-85 4-42 Keysight N5224A/25A Service Guide...
  • Page 349 4-45 illustrated , 6-76, 6-85 removal and replacement A47 test port 3 receiver step part number , 6-75, 6-84 illustrated attenuator 7-16 removal and replacement illustrated procedure , 6-76, 6-85 7-14 illustrated 7-46 operation accessories 5-22 Keysight N5224A/25A Service Guide...
  • Page 350 RAM 5-31 illustrated 6-106 mixer brick 5-22 part numbers 6-105 processing feet subgroup B receiver 5-30 illustrated 6-106 receiver group troubleshooting 5-22 4-29 part numbers 6-105 typical power output receiver step 4-41 Keysight N5224A/25A Service Guide...
  • Page 351 6-35 , 3-12, 3-14, 3-15, illustrated 6-67 replaceable RF cables 3-17, 3-19 part numbers 6-66 illustrated 6-37 connector repeatability bottom assembly, Option 410 part numbers 6-36 failure 3-20 replaceable parts Keysight N5224A/25A Service Guide...
  • Page 352 , 3-12, functional failure of 3-20 3-14 digital control of test port cables operator’s 3-19 3-12 group constants accessories used digital processing correction 8-17 3-12 group contacting Keysight description of 3-12 power supply group Keysight N5224A/25A Service Guide...
  • Page 353 10 MHz rebuilt assemblies 3-41 earth ground frequency reference board program EE default EXT 10 MHz REF IN connector See A14 adjustment 3-46 front frame rear panel 5-13 electrostatic discharge illustrated 6-11 See ESD Keysight N5224A/25A Service Guide...
  • Page 354 6-76, 6-85 8-14 GPIB part number instrument , 6-22, 6-28, board specifications 6-34, 6-47, 6-54, interconnects See A22 6-61, 6-68, 6-75, cables front panel 5-29 6-84 part numbers HANDLER I/O 6-107 Keysight N5224A/25A Service Guide...
  • Page 355 7-20 lithium battery parts list 6-12 miscellaneous replaceable disposal removal and replacement 1-10 parts removal and replacement illustrated 7-11 part numbers 6-106 illustrated procedure 7-58 7-10 mixer brick procedure test 7-57 4-17 See A27 and A28 Keysight N5224A/25A Service Guide...
  • Page 356 5-27 Option 201 digital processor accuracy 5-27 3-34 Option 210, bottom assembly display assembly noise floor 5-29 3-37 See bottom assembly, frequency reference receiver Option 210 board 5-12 Option 219, bottom assembly compression front panel 5-29 Keysight N5224A/25A Service Guide...
  • Page 357 3-39 GPIB 5-31 functional description of illustrated 7-11 HANDLER I/O 5-13 functional group procedure 7-11 5-31 group power supply TEST SET I/O 5-13 block diagram , 5-25, See A20 5-31 power switch 5-26 5-31 operation 5-22 Keysight N5224A/25A Service Guide...
  • Page 358 3-42 6-106 functional group part numbers 6-105 See cables, flex- group in rear panel assembly ible defined 4-31 illustrated 6-95 operation part numbers 6-94 See cables, RF troubleshooting 4-34 ribbon serial number match Keysight N5224A/25A Service Guide...
  • Page 359 5-27 3-19 results 3-27 front panel performing 5-27 3-14 performing 3-23 subnet mask, LAN 4-23 return loss 3-14 procedure 3-25 substitution return loss failure 3-15 what it verifies 3-21 cable 3-24 coupler Keysight N5224A/25A Service Guide...
  • Page 360 A17 13.5 GHz source 2 checks check the basics synthesizer board 4-37 insertion loss 3-15 fans A20 power supply 4-13 insertion loss front panel assembly 4-16 failure 3-17 front panel keypad A21 CPU board 4-16 4-21 Keysight N5224A/25A Service Guide...
  • Page 361 Z540-1-1994 Port 1 3-11 4-41 of operating environment Port 2 4-41 of operating Port 3 4-41 specifications Port 4 4-41 system , 3-1, 3-8, 3-21 using controllers to system dialog box 3-25 troubleshoot 4-22 Keysight N5224A/25A Service Guide...
  • Page 362 This information is subject to change without notice. © Keysight Technologies 2011-2017 Edition 1, December 2017 N5225-90001 www.keysight.com...

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