Keysight N5227A Series Service Manual
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Keysight N5227A Series Service Manual

Keysight N5227A Series Service Manual

2-port and 4-port pna microwave network analyzers
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N5227A
2-Port and 4-Port PNA
Microwave Network
Analyzers -
Service Guide
N5227A Series -
(10 MHz - 67 GHz)
This is the Service Guide for the N5227A Series Microwave Network Analyzers.
SERVICE GUIDE
)

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  • Page 1 N5227A 2-Port and 4-Port PNA Microwave Network Analyzers - Service Guide N5227A Series - (10 MHz - 67 GHz) This is the Service Guide for the N5227A Series Microwave Network Analyzers. SERVICE GUIDE...
  • Page 2 PERFORMANCE OF THIS to the public to use, modify, DOCUMENT OR ANY INFORMATION reproduce, release, perform, CONTAINED HEREIN. SHOULD display, or disclose commercial KEYSIGHT AND THE USER HAVE A computer software or SEPARATE WRITTEN AGREEMENT commercial computer software WITH WARRANTY TERMS...

  • Page 5: Table Of Contents

    Keysight Support, Services, and Assistance ........
  • Page 6 Assembly Replacement Sequence ..........4-5 Keysight N5227A Service Guide...
  • Page 7 A23 Test Set Motherboard ..........5-16 Keysight N5227A Service Guide...
  • Page 8 Miscellaneous Part Numbers ..........6-96 Keysight N5227A Service Guide...
  • Page 9 EEPROM Backup ............7-66 Keysight N5227A Service Guide...
  • Page 10 Storing Correction Constants ..........8-16 A:.EEPROM Address Assignments and Location (N5227A&B PNA and N5247A&B PNA-X Instruments) Keysight N5227A Service Guide...

  • Page 11: Safety And Regulatory Information

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Safety and Regulatory Information Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer. It also contains information that is required by various government regulatory agencies.

  • Page 12: Safety Symbols

    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 N5227A Service Guide...

  • Page 13: General Safety Considerations

    Any interruption of the protective conductor, inside or outside of the instrument, will make the instrument dangerous. Intentional interruption is prohibited. Use Keysight supplied power cord or one with same or better electrical rating. Always use the three-prong AC power cord supplied with this product.
  • Page 14 The measuring terminals on this instrument are designed to be used with external signals described in Measurement Category I, but NOT with external signals described in Categories II, III, and IV. The input of this instrument cannot be connected to the mains. Keysight N5227A Service Guide...

  • Page 15: Servicing

    LINE switch (disconnecting device). There are no replaceable fuses in the mains input or within the power supply assembly. Keysight personnel: after calibration is completed, attach four “calibration void if seal broken” stickers to the PNA as shown in Figure 1-1.
  • Page 16 Safety and Regulatory Information General Safety Considerations Figure 1-1 Location of Calibration Stickers on PNA Keysight N5227A Service Guide...

  • Page 17: Electrostatic Discharge Protection

    3. Connect the other end of the cable to the test port and remove the short from the cable. Figure 1-2 shows a typical ESD protection setup using a grounded mat and wrist strap. Refer to “ESD Supplies” on page 6-98 for part numbers. Keysight N5227A Service Guide...
  • Page 18 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5227A Service Guide...

  • Page 19: Regulatory Information

    This symbol indicate the presence of a Laser device. This symbol indicates the surface can be hot. This symbol indicated the product is sensitive to electrostatic discharge. Keysight N5227A Service Guide...
  • Page 20 The UK conformity mark is a UK government owned mark. Products showing this mark comply with all applicable UK regulations. The Keysight email address is required by EU directives applicable to our product. The CSA mark is a registered trademark of the CSA International.

  • Page 21: Lithium Battery Disposal

    If the battery on the A21 CPU board assembly needs to be disposed of, dispose of it in accordance with your country’s requirements. If required, you may return the battery to Keysight Technologies for disposal. Refer to “Contacting Keysight” on page 2-6 for assistance.
  • Page 22 Safety and Regulatory Information Regulatory Information 1-12 Keysight N5227A Service Guide...

  • Page 23: General Product Information

    Keysight Support, Services, and The Internet address (URL) for on-line assistance. page 2-6 Assistance Service and support options available. Calibration options available. Important information about shipping your analyzer to Keysight for service or repair.

  • Page 24: 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 “Contacting Keysight” on page 2-6 and to Chapter 3, “Tests and Adjustments.” Keysight N5227A Service Guide...

  • Page 25: Analyzer Options, Accessories, And Upgrades Available

    Analyzer Options, Accessories, and Upgrades Available Analyzer Options, Accessories, and Upgrades Available To see a list of the options, accessories and upgrades available for the network analyzers, including ordering information, refer to the Keysight PNA Family Microwave Network Analyzers Configuration Guide, available online at https://www.keysight.com/us/en/assets/7018-02943/configuration-guides/ 5990-7745.pdf...

  • Page 26: Required Service Test Equipment

    Digital voltmeter Resolution: 10 mV Electronic Tool (ET) – N7840A Metrology Stability (Option 410 Only) ET-55919* None Switch box (Option 410 *Internal Keysight only) Only Printer Any printer with Microsoft Windows XP or Windows 7 driver Mouse Keysight N5227A Service Guide...
  • Page 27 If an accurate measurement of the dynamic accuracy specification is not required, the E4418A or E4419A can be used. e. This sensor and adapter must be calibrated together by the Keysight factory. The data supplied is only valid as long as the sensor and adapter remain connected.

  • Page 28: Keysight Support, Services, And Assistance

    Service and Support Options The analyzer’s standard warranty period is one year from the time of initial delivery. All repairs require the analyzer to be shipped to the nearest Keysight Technologies service center. Extended warranty periods can be purchased with the initial product purchase.

  • Page 29: Shipping Your Analyzer To Keysight For Service Or Repair

    General Product Information Keysight Support, Services, and Assistance If you do not have access to the Internet, please contact your Keysight field engineer. In any correspondence or telephone conversation, refer to the Keysight product by its model number and full serial number. With this information, the Keysight representative can determine whether your product is still within its warranty period.
  • Page 30 General Product Information Keysight Support, Services, and Assistance Keysight N5227A Service Guide...

  • Page 31: Tests And Adjustments

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Tests and Adjustments Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your PNA. — The checks verify the operation of the assemblies in your analyzer.
  • Page 32 Source Maximum Power Output Test — Source Power Linearity Test — Frequency Accuracy Test — Trace Noise Test — Receiver Compression Test — Noise Floor Test — Calibration Coefficients Test — Dynamic Accuracy Test — Noise State Calibration Coefficients Keysight N5227A Service Guide...
  • Page 33 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 N5227A Service Guide...

  • Page 34: 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 N5227A Service Guide...

  • Page 35: Allow The Analyzer To Warm Up

    Prior to making connections to your analyzer, carefully review the information about inspecting, cleaning, and gaging connectors. Refer to the calibration kit documentation for detailed connector care information. For course numbers about additional connector care instruction, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-6. Table 3-1...
  • Page 36 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 ener- gizing the instrument. Keysight N5227A Service Guide...

  • Page 37: 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 N5227A Service Guide...

  • Page 38: Instrument Specifications

    Performance tests are contained in the analyzer’s firmware with Options 897 or 898 and are described at “Performance Tests” on page 3-31. 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. Keysight N5227A Service Guide...

  • Page 39: Certificate Of Calibration

    If you have a measurement application that does not use all of the measurement capabilities of the analyzer, you may ask your local Keysight Technologies service office to verify only a subset of the specifications. However, this “limited calibration” creates the possibility of making inaccurate measurements if you then use the analyzer in an application requiring additional capabilities.

  • Page 40: Ansi/Ncsl Z540.3-2006 And Iso/Iec 17025 Verification

    After the failure has been corrected, repeat the entire set of performance tests and generate a new set of data. Figure 3-1 ANSI/NCSL Z540.3–2006 and ISO/IEC 17025 Verification Flowchart 1. Stop only in case of a catastrophic failure or cable connector damage 3-10 Keysight N5227A Service Guide...

  • Page 41: 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 N5227A Service Guide 3-11...

  • Page 42: 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 N5227A Service Guide...
  • Page 43 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 N5227A Service Guide 3-13...

  • Page 44: 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 N5227A Service Guide...
  • Page 45 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 N5227A Service Guide 3-15...
  • Page 46 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 N5227A Service Guide...
  • Page 47 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 N5227A Service Guide 3-17...
  • Page 48 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 N5227A Service Guide...
  • Page 49 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 N5227A Service Guide 3-19...
  • Page 50 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 N5227A Service Guide...

  • Page 51: 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 N5227A Service Guide 3-21...

  • Page 52: Measurement Traceability

    This is accomplished by measuring the devices in a Keysight verification kit. The measurement of the devices in the verification kit has a traceable path...

  • Page 53: 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 N5227A Service Guide 3-23...
  • Page 54 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 N5227A Service Guide...
  • Page 55 Tests and Adjustments System Verification If the system verification is performed with a non-Keysight cable, ensure that the cable meets or exceeds the specifications for the test cable specified in the previous table, “Equipment Used in the System Verification Procedure.”...
  • Page 56 3-30. — File Tabular Data: Writes the tabular data to a text file in the Windows XP directory C:\Program Files\Keysight\Network Analyzer\Documents\ or in the Windows 7 directory C:\Users\Public\Public Documents\Network Analyzer\SysVer\. — File Graphs: Saves a screen image in PNG format in the Windows XP...
  • Page 57 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 N5227A Service Guide 3-27...
  • Page 58 Tests and Adjustments System Verification Each S-parameter measurement result is printed with frequency tested, lower and upper limit lines, the measured data, and the result of the test. Figure 3-12 Example of Printed Tabular Verification Results 3-28 Keysight N5227A Service Guide...
  • Page 59 — 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 N5227A Service Guide 3-29...
  • Page 60 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results 3-30 Keysight N5227A Service Guide...

  • Page 61: 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 N5227A Service Guide 3-31...

  • Page 62: 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 N5227A Service Guide...

  • Page 63: 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 N5227A Service Guide 3-33...

  • Page 64: 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 N5227A Service Guide...

  • Page 65: 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 N5227A Service Guide 3-35...
  • Page 66 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 N5227A Service Guide...

  • Page 67: 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 N5227A Service Guide 3-37...

  • Page 68: 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 N5227A Service Guide...

  • Page 69: 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 N5227A Service Guide 3-39...

  • Page 70: Noise State Calibration Coefficients

    “Removing and Replacing the A4–A17 Boards” on page 7-11. Noise State Calibration Coefficients IMPORTANT! For the most current information on the Table 7-2 “Verification, Performance, and Other Tests and Procedures” column’s content, refer to https://cal.software.keysight.com/PNA/Help/N7840AWebHelp.htm. 3-40 Keysight N5227A Service Guide...

  • Page 71: 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 N5227A Service Guide 3-41...

  • Page 72: Synthesizer Bandwidth Adjustment

    The source calibration is used to adjust your network analyzer for a flat source power across its full frequency range. There are differences between each test port; therefore, an adjustment is required for each port. 3-42 Keysight N5227A Service Guide...
  • Page 73 None Adapter, Type-N (f) to 2.4 mm (f) a. This sensor and adapter must be calibrated together by the Keysight factory. The data supplied is only valid as long as the sensor and adapter remain connected. b. The 1.85 mm connector has the same ruggedness and is compatible with the 2.4 mm connectors.

  • Page 74: If Gain Adjustment

    If the test set motherboard is replaced, the PNA firmware will automatically create new primary mxcalfile_pxx files from the backup copies on the hard drive. These files can be recreated by performing another receiver calibration adjustment. 3-44 Keysight N5227A Service Guide...
  • Page 75 N4697E N4697-60200 a. This sensor and adapter must be calibrated together by the Keysight factory. The data supplied is only valid as long as the sensor and adapter remain connected. b. The 1.85 mm connector has the same ruggedness and is compatible with the 2.4 mm connectors.

  • Page 76: Ee Default Adjustment

    4. Follow the instructions and prompts as they are displayed. Figure 3-17 Equipment Setup 2 for the Receiver Adjustment Figure 3-18 Equipment Setup 3 for the Receiver Adjustment EE Default Adjustment This sets the EEPROM data to their default values. 3-46 Keysight N5227A Service Guide...

  • Page 77: If Response Adjustment (Option 090, 093, Or 094 Only)

    Procedure Service Adjustments 1. Press UTILITY , then , then , then click IF System Response Adjustment. 2. Follow the instructions and prompts as they are displayed. Keysight N5227A Service Guide 3-47...
  • Page 78 Tests and Adjustments Adjustments 3-48 Keysight N5227A Service Guide...

  • Page 79: 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 80: 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 N5227A Service Guide...

  • Page 81: 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 N5227A Service Guide...

  • Page 82: 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 N5227A Service Guide...

  • Page 83: 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 N5227A Service Guide...

  • Page 84: 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 85 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 N5227A Service Guide...

  • Page 86: 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 2-6. Keysight N5227A Service Guide...

  • Page 87: 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 N5227A Service Guide...
  • Page 88 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 N5227A Service Guide...
  • Page 89 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 N5227A Service Guide 4-11...
  • Page 90 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 N5227A Service Guide...
  • Page 91 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 N5227A Service Guide 4-13...

  • Page 92: 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 7-9. 4-14 Keysight N5227A Service Guide...
  • Page 93 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 N5227A Service Guide 4-15...

  • Page 94: 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 N5227A Service Guide...
  • Page 95 “Removing the A1 Front Panel Interface Board and Keypad Assembly” on page 7-9. 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 N5227A Service Guide 4-17...
  • Page 96 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 the A1 Front Panel Interface Board and Keypad Assembly” on page 7-9. 4-18 Keysight N5227A Service Guide...

  • Page 97: A3 Display Test

    — If the device performs correctly, the USB board is functioning properly. — If the device does not perform correctly, the USB board is faulty. Refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-9. Keysight N5227A Service Guide 4-19...

  • Page 98: 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 N5227A Service Guide...

  • Page 99: 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 N5227A Service Guide 4-21...

  • Page 100: 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 N5227A Service Guide...
  • Page 101 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 N5227A Service Guide 4-23...
  • Page 102 . 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 N5227A Service Guide...
  • Page 103 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 N5227A Service Guide 4-25...
  • Page 104 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 N5227A Service Guide...
  • Page 105 Troubleshooting Rear Panel Troubleshooting Figure 4-5 Construction of a Crossover Cable Keysight N5227A Service Guide 4-27...

  • Page 106: Measurement System Troubleshooting

    , then , then Help . Verify that the information displayed in this screen is correct for About NA... your analyzer. If any of the information is incorrect, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-6. 4-28 Keysight N5227A Service Guide...
  • Page 107 , then , then View EEPROM Headers . Refer to Figure 4-6. If the information is incorrect for any of the PC boards, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-6. Figure 4-6 EEPROM Header Info Dialog Window...

  • Page 108: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)

    — 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 N5227A Service Guide...

  • Page 109: Where To Begin Troubleshooting

    — Go to Chapter 3, “Tests and Adjustments.” and perform all the tests in that section. — If a problem still exists, contact Keysight. Refer to “Contacting Keysight” on page 2-6. — If any of the traces are not present, are noisy or distorted, or are at an incorrect level, then there is a problem with the analyzer’s measurement...
  • Page 110 1. Some PNAs have installed a legacy HMA26.5 (5087-7765) that is used with a dis- crete A26 splitter. Some PNAs have installed a new HMA26.5 (N5240-60101) with an integrated splitter. To identify which HMA26.5 is installed in your PNA, refer to “Verify the Model/Version of HMA26.5 Installed” on page 4-32 Keysight N5227A Service Guide...
  • Page 111 Network Adapters 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 112: Checking The Source Group

    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 N5227A Service Guide...
  • Page 113 5. If any of the 50 MHz signals are not present, replace the A14 frequency reference board. Refer to “Removing and Replacing the A4–A17 Boards” on page 7-11. 6. If the 50 MHz signals are present, reconnect the cables, and then: Keysight N5227A Service Guide 4-35...
  • Page 114 Cables, Standard 4-Port Configuration, Option 400” on page 6-50. Locate the semirigid cable W52 (4-port models with a legacy HMA26.5) or W80 (2-port models with a legacy HMA26.5 and for all models with a new HMA26.5) at the A25 HMA26. 4-36 Keysight N5227A Service Guide...
  • Page 115 The new N5240-60101 HMA26.5 has the splitter integrated into the assembly and uses an N5222-20126 cable. Refer to Figure 4-9 on page See also Chapter 6, “Replaceable Parts.” and the “Bottom Assemblies and Cables” section for your configuration and serial number prefix. Keysight N5227A Service Guide 4-37...
  • Page 116 A26 splitter. Refer to “Removing and Replacing the A26 Splitter” on page 7-32. 7. If the signal is present, reconnect cables W53 and W54, and then continue with “Checking the Receiver Group” on page 4-46. 4-38 Keysight N5227A Service Guide...

  • Page 117: Removing And Replacing The A4-A17 Boards

    4-28. If the observed problem was frequency banded rather than broadband related, set the analyzer frequency to the center of the problem band. The spectrum analyzer should measure a signal above the network analyzer setting. For analyzers with DSP version Keysight N5227A Service Guide 4-39...
  • Page 118 6-71. Locate the following cables. (Boards A61 and A62 are available only in 4-port models and 2-port models with Option 224.) — W27 on the A60 doubler board, — W28 on the A61 doubler board 4-40 Keysight N5227A Service Guide...

  • Page 119: Checking The Signal Separation Group

    “Removing the Covers” on page 7-7. Procedures described in this document are performed with power supplied to the product while protective covers are removed. Energy available at many points may, if contacted, result in personal injury. Keysight N5227A Service Guide 4-41...
  • Page 120 1. Connect the power sensor to the suspect port. 2. Set the trace to measure S , or S , dependent on the suspect port. 3. Observe the power reading on the power meter as the sweep occurs on the analyzer. 4-42 Keysight N5227A Service Guide...
  • Page 121 Set the network analyzer for an S measurement for Port 1, 2, 11, S22, S33, or S44, 3, or 4 respectively, with a CW frequency of 800 MHz. Perform the following checks in the order presented. Keysight N5227A Service Guide 4-43...
  • Page 122 Checking the A38, A39, A40, and A41 60-dB Source Step Attenuators 1. Locate the appropriate semirigid cable at the output of the source step attenuator to be checked: — Options 219, 224, 419, and 423 — Port 1; W82 of A38 4-44 Keysight N5227A Service Guide...
  • Page 123 800 MHz. 4. If the 800 MHz signal is present, replace the associated receiver coupler. Refer to “Removing and Replacing the A29 –A32 Receiver Couplers and Receiver Coupler Mounting Brackets” on page 7-36. Keysight N5227A Service Guide 4-45...

  • Page 124: Checking The Receiver Group

    Covers” on page 7-7. Procedures described in this document are performed with power supplied to the product while protective covers are removed. Energy available at many points may, if contacted, result in personal injury. 4-46 Keysight N5227A Service Guide...
  • Page 125 5. If the measured signal is present, continue testing at “Checking the A24 IF Multiplexer Board” on page 4-48. 6. If the measured signal is missing on the R1 receiver, continue testing at “Checking the A37 Reference Mixer Switch” on page 4-48. Keysight N5227A Service Guide 4-47...
  • Page 126 “Removing and Replacing the A27 and A28 Mixer Bricks” on page 7-34. Checking the A24 IF Multiplexer Board 1. Locate each of the flexible RF cables at the output receivers of the IF multiplexer board: — 2-port models 4-48 Keysight N5227A Service Guide...
  • Page 127 “Removing and Replacing the A4–A17 Boards” on page 7-11. 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 7-27. Keysight N5227A Service Guide 4-49...

  • Page 128: Instrument Block Diagrams Sheet 1

    Troubleshooting Instrument Block Diagrams Sheet 1 Instrument Block Diagrams Sheet 1 Microwave PNA, N5227A, 2–Port 4-50 Keysight N5227A Service Guide...
  • Page 129 N5227A 2-Port Overall Block Diagram (Includes Options 200-Standard; 201-Configurable Test Set; and 219-Attenuators and Bias Tees) Service Guide: N5227-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq > 53 MHz OPTION 200 OR 210 ADC MODULE (SPAM) Main IF A...

  • Page 130: Instrument Block Diagrams Sheet 2

    Troubleshooting Instrument Block Diagrams Sheet 2 Instrument Block Diagrams Sheet 2 Microwave PNA, N5227A, 4–Port 4-52 Keysight N5227A Service Guide...
  • Page 131 N5227A 4-Port Overall Block Diagram (Includes Options 400-Standard; 401-Configurable Test Set; and 419-Attenuators and Bias Tees) Service Guide: N5227-90001 DISPLAY USB BD A24 IF MULTIPLEXER A16 SIGNAL PROCESSING IF = 0.826 MHz for CW Freq < 53 MHz IF = 7.438 MHz for CW Freq > 53 MHz OPTION 400 OR 410 ADC MODULE (SPAM) Main IF A...
  • Page 132 Troubleshooting Instrument Block Diagrams Sheet 2 4-54 Keysight N5227A Service Guide...

  • Page 133: 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 N5227A 2-port and 4-port PNA microwave network analyzers. — Theory of operation is explained to the assembly level only.
  • Page 134 Theory of Operation Information in This Chapter Section Title Summary of Content Start Page Power Supply Group Operation Operation of the power supply assembly group. page 5-35 Keysight N5227A Service Guide...

  • Page 135: 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 N5227A Service Guide...

  • Page 136: 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 N5227A Service Guide...
  • Page 137 Refer to “Signal Separation Group Operation” on page 5-20. 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 N5227A Service Guide...
  • Page 138 “Digital Processing and Digital Control Group Operation” on page 5-30. 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 5-35. Keysight N5227A Service Guide...

  • Page 139: 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 N5227A Service Guide...
  • Page 140 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. Figure 5-3 Source Group, Part 1 Keysight N5227A Service Guide...
  • Page 141 Theory of Operation Synthesized Source Group Operation Figure 5-4 Source Group, Part 2 Keysight N5227A Service Guide...
  • Page 142 0.50761 to 0.50761 to 0.500 to 0.500 to 0.500 to 0.500 to 0.63561 0.63561 0.628 0.628 0.628 0.628 0.63561 to 0.63561 to 0.628 to 0.628 to 0.628 to 0.628 to 1.00761 1.00761 1.000 1.000 1.000 1.000 5-10 Keysight N5227A Service Guide...
  • Page 143 6.75880 to 13.51761 to 6.755 to 13.510 to 13.510 to 13.510 to 7.70380 15.40761 7.700 15.400 15.400 15.400 7.70380 to 15.40761 to 7.700 to 15.400 to 15.400 to 15.400 to 8.00380 16.00761 8.000 16.000 16.000 16.000 Keysight N5227A Service Guide 5-11...
  • Page 144 8.3346 to 16.6692 to 12.500 to 12.500 to 25.000 to 50.000 to 9.0039 18.0079 13.504 13.504 27.008 54.016 9.0039 to 18.0079 to 6.752 to 13.504 to 27.008 to 54.016 to 10.0013 20.0025 7.500 15.000 30.000 60.000 5-12 Keysight N5227A Service Guide...

  • Page 145: A4, A15, And A17 13.5 Ghz Synthesizer Boards

    (the source synthesizers). This is because the output of the A15 13.5 GHz synthesizer board is routed through the A25 LO multiplier/amplifier 26.5 board to the A27 and A28 mixer bricks where they are mixed with the test signals to Keysight N5227A Service Guide 5-13...

  • Page 146: A5 And A10 26.5 Ghz Source Boards

    This output is terminated with a 50-ohm load on the A8, A12, and A13 doubler boards. The companion signal, EXT TEST SET DRIVE LO, is output from the A27 mixer brick. Refer to “A27 and A28 Mixer Bricks” on page 5-25. 5-14 Keysight N5227A Service Guide...

  • Page 147: A56, A57, A58, And A59 70 Ghz Doubler Boards

    HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9. Keysight N5227A Service Guide 5-15...

  • Page 148: A23 Test Set Motherboard

    Connector settings can be changed using SCPI and COM commands. The settings are not accessible from the front panel. Table 5-4 on page 5-18 PWR I/O A DB-9 female connector. Pin assignments are listed in 5-16 Keysight N5227A Service Guide...
  • Page 149 TTL out, high = read, low = write Table 5-3 HANDLER I/O Connector Pin Assignments Rectangular 36-Pin Female Connector Pin Numbers Name Function 0 V, ground reference INPUT1 TTL in, negative pulse (1 μs min) latches OUTPUT1-2 Keysight N5227A Service Guide 5-17...
  • Page 150 TTL out, active low pass/fail write strobe (1 μs min) Strobe Table 5-4 PWR I/O Connector Pin Assignments DB-9 Female Connector Name Description +15V +15 V @ 400 mA -15V -15 V @ 400 mA 5-18 Keysight N5227A Service Guide...
  • Page 151 Analog input: ±10 V @ 1.22 mV typical resolution Rin > 1 M-ohm BW ≥ 1 MHz ADC conversion time < 1 us typical Power Button Open collector input Active low replicates power button key press. Keysight N5227A Service Guide 5-19...

  • Page 152: 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 5-20 Keysight N5227A Service Guide...

  • Page 153: 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. Keysight N5227A Service Guide 5-21...
  • Page 154 Theory of Operation Signal Separation Group Operation Figure 5-5 4-Port Signal Separation Group 5-22 Keysight N5227A Service Guide...
  • Page 155 Theory of Operation Signal Separation Group Operation Figure 5-6 2-Port Signal Separation Group Keysight N5227A Service Guide 5-23...

  • Page 156: A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees (Optional)

    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. 5-24 Keysight N5227A Service Guide...

  • Page 157: Receiver Group Operation

    For frequencies at or above 53 MHz, the test signals (receivers A, B, C, and D for 4-port models and A and B for 2-port models) and the reference signals (receivers R1, R2, R3, and R4 for 4-port models and R1 and R2 for 2-port Keysight N5227A Service Guide 5-25...

  • Page 158: A24 If Multiplexer Board

    IFGateAin IF pulse gate input A (TTL) IFGateBin IF pulse gate input B (TTL) IFGateCin IF pulse gate input C (TTL) IFGateDin IF pulse gate input D (TTL) IFGateRin IF pulse gate input R (TTL) 5-26 Keysight N5227A Service Guide...

  • Page 159: A16 Spam Board (Analog Description)

    The processed and formatted data is finally routed to the display, and to the general-purpose interface bus (GPIB) for remote operation. Refer to “Digital Processing and Digital Control Group Operation” on page 5-30 for more information on signal processing. Keysight N5227A Service Guide 5-27...
  • Page 160 Theory of Operation Receiver Group Operation Figure 5-7 4-Port Receiver Group 5-28 Keysight N5227A Service Guide...
  • Page 161 Theory of Operation Receiver Group Operation Figure 5-8 2-Port Receiver Group Keysight N5227A Service Guide 5-29...

  • Page 162: 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 Hard Disk Drive (HDDA) 5-30 Keysight N5227A Service Guide...
  • Page 163 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-9 Digital Processing and Digital Control Group Keysight N5227A Service Guide 5-31...

  • Page 164: Front Panel Subgroup

    The video data received from the A21 CPU board includes the following: • digital TTL horizontal sync • digital TTL red video • blanking • digital TTL vertical sync • digital TTL green video • data clock • digital TTL blue video 5-32 Keysight N5227A Service Guide...

  • Page 165: Data Acquisition And Processing Subgroup

    In addition, when the analyzer is in the system controller mode, the CPU controls peripheral devices through the peripheral port interfaces. Front panel settings are stored in SRAM, with a battery providing at least five years of backup storage when external power is off. Keysight N5227A Service Guide 5-33...
  • Page 166 A21 CPU board. The full operating system and firmware for the network analyzer is stored on the A55 solid state drive. 5-34 Keysight N5227A Service Guide...

  • Page 167: Power Supply Group Operation

    The +15 V standby supply remains on continuously whenever the power supply is plugged in. This supply is used to provide power to front panel LEDs and CPU components when the analyzer is turned off. Keysight N5227A Service Guide 5-35...
  • Page 168 Theory of Operation Power Supply Group Operation 5-36 Keysight N5227A Service Guide...

  • Page 169: Replaceable Parts

    Service Guide Replaceable Parts Information in This Chapter This chapter: — identifies the replaceable parts for the Keysight PNA series microwave network analyzer. — includes several tables and illustrations to assist you in identifying the correct part for your analyzer.

  • Page 170: 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 2-6.

  • Page 171: Assembly Replacement Sequence

    Adjustments.” Step 5. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Step 6. Keysight personnel: see Figure 1-1 on page 1-6 to review where the calibration stickers should be placed on the PNA. Keysight N5227A Service Guide...

  • Page 172: 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 N5227A Service Guide...
  • Page 173 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5227A Service Guide...

  • Page 174: Replaceable Parts Listings

    Replaceable Parts Replaceable Parts Listings Replaceable Parts Listings This section contains the replacement part numbers and their descriptions for your Keysight microwave PNA. You can find the locations of replaceable parts in this section: — listed by reference designator in Table 6-1, or —...
  • Page 175 Port 2 bias tee Port 1 receiver step attenuator Port 3 receiver step attenuator Port 4 receiver step attenuator Port 2 receiver step attenuator solid state drive “Top Assemblies and Cables, All Options” on page 6-16. Keysight N5227A Service Guide...
  • Page 176 PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 Keysight N5227A Service Guide...
  • Page 177 Battery on page 6-97 — Protective Guards for Front Panel Jumpers on page 6-97 — USB Accessories on page 6-98 — ESD Supplies on page 6-98 — Rack Mount Kits and Handle Kits on page 6-98 Keysight N5227A Service Guide...

  • Page 178: Front Panel Assembly, Front Side, All Options

    N5227-80001 Nameplate, N5227A  0515-1946 Machine screw, M3.0 x 6, 90-deg flat head (To attach subpanel to front  frame.) (Only 2 used on 2-port, all 4 used on 4-port.) Not shown 5023-1399 Front handle 6-10 Keysight N5227A Service Guide...
  • Page 179 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Keysight N5227A Service Guide 6-11...

  • Page 180: Front Panel Assembly, Back Side, All Options

    Power button keypad W1312-60047 Touch screen controller board cable harness Was 8121-1452 8121-1451 Power switch cable harness 1400-0510 Cable clamp (with adhesive backing) 0515-0667 Machine screw, M3.0 x 25 pan head (To attach display to front frame.) 6-12 Keysight N5227A Service Guide...
  • Page 181 In March 2013, Keysight discontinued using a display with florescent tube backlighting, and began using a display with LED backlighting. Associated parts are indicated in this table with either “Tube” or “LED.” If you replace an old part number <des- ignated “Tube”>...
  • Page 182 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 N5227A Service Guide...
  • Page 183 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Keysight N5227A Service Guide 6-15...

  • Page 184: Top Assemblies And Cables, All Options

    All prefixes – W1312-60211 CPU board assembly (See Version 7 Was: W1312-60210 critical note) All prefixes – W1312-60196 or Version 4, 5 , 6, W1312-60297 & 6.1 Was W1312-60190, or W1312-60068 All prefixes N5240-60059 GPIB board 6-16 Keysight N5227A Service Guide...
  • Page 185 Versions 4 and 5 CPUs are obsolete. And, the N5242-60035, and N5242-60044 HDDA’s are no longer orderable from Keysight. Please contact Keysight to discuss options for migrating to a newer CPU and solid state drive. Refer to, “Contacting Keysight” on page 2-6 d.
  • Page 186 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Options 6-18 Keysight N5227A Service Guide...
  • Page 187 A24 IF multiplexer board P603 to A16 SPAM board J5 (4-port) N5242-60016 A24 IF multiplexer board P803 to A16 SPAM board J6 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-19...
  • Page 188 If your instrument has a SPAM 4 board, use W80 and W82 for 2-port and 4-port models (Not shown here). For SPAM 5 boards, use W99 and 100 for 2-port models. Refer to “Top Cables, All Cables—All Options” on page 6-19. 6-20 Keysight N5227A Service Guide...
  • Page 189 Replaceable Parts Replaceable Parts Listings Figure 6-7 Top Cables, All Cables—All Options Keysight N5227A Service Guide 6-21...

  • Page 190: 2-Port Configuration, Option 200

    Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-22 Keysight N5227A Service Guide...
  • Page 191 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, Standard 2-Port Configuration, Option 200 Keysight N5227A Service Guide 6-23...
  • Page 192 A32 port 2 receiver coupler to A36 port 2 coupler W135 N5227-20007 A33 port 1 coupler to A27 mixer brick (A) W138 N5227-20008 A36 port 2 coupler to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-24 Keysight N5227A Service Guide...
  • Page 193 Replaceable Parts Replaceable Parts Listings Figure 6-9 Bottom RF Cables, Standard 2-Port Configuration, Option 200 Keysight N5227A Service Guide 6-25...
  • Page 194 A23 test set motherboard J551 to A27 mixer brick (1) J52  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-26 Keysight N5227A Service Guide...
  • Page 195 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Keysight N5227A Service Guide 6-27...

  • Page 196: 2-Port Configuration, Option 201

    PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 6-28 Keysight N5227A Service Guide...
  • Page 197 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, Option 201 Keysight N5227A Service Guide 6-29...
  • Page 198 A27 mix brick to rear-panel EXT TSET DRIVE LO OUT (J5) N5242-60017 A27 mixer brick (A) to A24 IF multiplexer (P1) N5242-60025 A27 mixer brick (R1) to A24 IF multiplexer (P601) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-30 Keysight N5227A Service Guide...
  • Page 199 A27 mixer brick (B) to A24 IF multiplexer (P201) W79 - 83, Refer to “Top Cables, All Cables—All Options” on page 6-19. W91- 92, W97- 100 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5227A Service Guide 6-31...
  • Page 200 Replaceable Parts Replaceable Parts Listings Figure 6-12 Bottom RF Cables, Option 201 6-32 Keysight N5227A Service Guide...
  • Page 201 A23 test set motherboard J551 to A27 mixer brick (1) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-33...
  • Page 202 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables and Wire Harnesses, Option 201 6-34 Keysight N5227A Service Guide...

  • Page 203: 2-Port Configuration, Option 210

    PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 Keysight N5227A Service Guide 6-35...
  • Page 204 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Assemblies, Option 210 6-36 Keysight N5227A Service Guide...
  • Page 205 A32 port 2 receiver coupler to A36 port 2 coupler a. SR = semirigid coaxial cable; F = flexible coaxial cable 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-37...
  • Page 206 Replaceable Parts Replaceable Parts Listings Figure 6-15 Bottom RF Cables, Option 210 6-38 Keysight N5227A Service Guide...
  • Page 207 A23 test set motherboard J551 to A27 mixer brick (1) J52  a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-39...
  • Page 208 Replaceable Parts Replaceable Parts Listings Figure 6-16 Bottom Ribbon Cables and Wire Harnesses, Option 210 6-40 Keysight N5227A Service Guide...

  • Page 209: 2-Port Configuration, Option 219

    PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 Keysight N5227A Service Guide 6-41...
  • Page 210 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom Assemblies, Option 219 6-42 Keysight N5227A Service Guide...
  • Page 211 “Top Cables, All Cables—All Options” on page 6-19. W91- 92, W97- 100 W101 N5247-20083 A29 port 1 receiver coupler to A38 port 1 source attenuator 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-43...
  • Page 212 N5247-20020 Port 2 RCVR B IN to A49 port 2 receiver attenuator W124 N5247-20046 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-44 Keysight N5227A Service Guide...
  • Page 213 Replaceable Parts Replaceable Parts Listings Figure 6-18 Bottom RF Cables, Option 219 Keysight N5227A Service Guide 6-45...
  • Page 214 A23 test set motherboard J551 to A27 mixer brick (1) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-46 Keysight N5227A Service Guide...
  • Page 215 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Ribbon Cables and Wire Harnesses, Option 219 Keysight N5227A Service Guide 6-47...

  • Page 216: 4-Port Configuration, Option 400

    PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 6-48 Keysight N5227A Service Guide...
  • Page 217 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Keysight N5227A Service Guide 6-49...
  • Page 218 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) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-50 Keysight N5227A Service Guide...
  • Page 219 A34 port 3 coupler to A28 mixer brick (C) W137 N5227-20013 A35 port 4 coupler to A28 mixer brick (D) W138 N5227-20012 A36 port 2 coupler to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5227A Service Guide 6-51...
  • Page 220 Replaceable Parts Replaceable Parts Listings Figure 6-21 Bottom RF Cables, Standard 4-Port Configuration, Option 400 6-52 Keysight N5227A Service Guide...
  • Page 221 A23 test set motherboard J552 to A28 mixer brick (2) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-53...
  • Page 222 Replaceable Parts Replaceable Parts Listings Figure 6-22 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 6-54 Keysight N5227A Service Guide...

  • Page 223: 4-Port Configuration, Option 401

    PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 Keysight N5227A Service Guide 6-55...
  • Page 224 Replaceable Parts Replaceable Parts Listings Figure 6-23 Bottom Assemblies, Option 401 6-56 Keysight N5227A Service Guide...
  • Page 225 Port 2 CPLR THRU to A36 port 2 coupler N5247-20076 A32 port 2 receiver coupler to front-panel REF 2 SOURCE OUT 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-57...
  • Page 226 A28 mixer brick (R3) to A24 IF multiplexer (P413) N5242-60023 A28 mixer brick (C) to A24 IF multiplexer (P601) W79 - 83, Refer to “Top Cables, All Cables—All Options” on page 6-19. W91 - 100 6-58 Keysight N5227A Service Guide...
  • Page 227 Replaceable Parts Replaceable Parts Listings a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5227A Service Guide 6-59...
  • Page 228 Replaceable Parts Replaceable Parts Listings Figure 6-24 Bottom RF Cables, Option 401 6-60 Keysight N5227A Service Guide...
  • Page 229 A23 test set motherboard J552 to A28 mixer brick (2) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-61...
  • Page 230 Replaceable Parts Replaceable Parts Listings Figure 6-25 Bottom Ribbon Cables and Wire Harnesses, Option 401 6-62 Keysight N5227A Service Guide...

  • Page 231: 4-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. Keysight N5227A Service Guide 6-63...
  • Page 232 PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 6-64 Keysight N5227A Service Guide...
  • Page 233 Replaceable Parts Replaceable Parts Listings Figure 6-26 Bottom Assemblies, Option 410 Keysight N5227A Service Guide 6-65...
  • Page 234 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) 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-66 Keysight N5227A Service Guide...
  • Page 235 A31 port 4 receiver coupler to A66 test port 4 6-dB attenuator W142 N5227-20022 A32 port 2 receiver coupler to A67 test port 2 6-dB attenuator SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5227A Service Guide 6-67...
  • Page 236 Replaceable Parts Replaceable Parts Listings Figure 6-27 Bottom RF Cables, Option 410 6-68 Keysight N5227A Service Guide...
  • Page 237 A23 test set motherboard J552 to A28 mixer brick (2) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-69...
  • Page 238 Replaceable Parts Replaceable Parts Listings Figure 6-28 Bottom Ribbon Cables and Wire Harnesses, Option 410 6-70 Keysight N5227A Service Guide...

  • Page 239: 4-Port Configuration, Option 419

    Port 4 receiver attenuator Port 2 receiver attenuator 5087-7336 Port 1 70 GHz doubler Port 3 70 GHz doubler Port 4 70 GHz doubler Port 2 70 GHz doubler 08490-60037 3 dB attenuator N5240-60058 Front-panel LED board  Keysight N5227A Service Guide 6-71...
  • Page 240 PNA has installed, refer to Chapter 7 and and for details on A26 splitter Figure 7-8 on page 31 and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9 6-72 Keysight N5227A Service Guide...
  • Page 241 Replaceable Parts Replaceable Parts Listings Figure 6-29 Bottom Assemblies, Option 419 Keysight N5227A Service Guide 6-73...
  • Page 242 A29 port 1 receiver coupler to A38 port 1 source attenuator W102 N5247-20014 A38 port 1 source attenuator to front-panel port 1 SOURCE OUT 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-74 Keysight N5227A Service Guide...
  • Page 243 W144 N5247-20071 A29 port 1 receiver coupler to A37 reference mixer switch W145 N5247-20066 REF 2 RCVR R2 IN to A27 mixer brick (R2) a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5227A Service Guide 6-75...
  • Page 244 Replaceable Parts Replaceable Parts Listings Figure 6-30 Bottom RF Cables, Option 419 (Ports 1 and 2) 6-76 Keysight N5227A Service Guide...
  • Page 245 A31 port 4 receiver coupler to A40 port 4 source attenuator W110 N5247-20025 A40 port 4 source attenuator to front-panel port 4 SOURCE OUT 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. Keysight N5227A Service Guide 6-77...
  • Page 246 N5247-20024 Port 4 RCVR D IN to A48 port 4 receiver attenuator W122 N5247-20065 A48 port 4 receiver attenuator to A28 mixer brick (D) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-78 Keysight N5227A Service Guide...
  • Page 247 Replaceable Parts Replaceable Parts Listings Figure 6-31 Bottom RF Cables, Option 419 (Ports 3 and 4) Keysight N5227A Service Guide 6-79...
  • Page 248 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 1. For bulkhead connectors, refer to “Bottom Hardware and Miscellaneous Parts” on page 6-90. 6-80 Keysight N5227A Service Guide...
  • Page 249 A23 test set motherboard J551 to A27 mixer brick (1) J52 N5247-60015 A23 test set motherboard J552 to A28 mixer brick (2) J52 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5227A Service Guide 6-81...
  • Page 250 Replaceable Parts Replaceable Parts Listings Figure 6-32 Bottom Ribbon Cables and Wire Harnesses, Option 419 6-82 Keysight N5227A Service Guide...

  • Page 251: Rear-Panel Assembly, All Options

    Ferrite for HANDLER I/O ribbon cable assembly 9170-2236 2190-0068 Lock washer (for rear-panel BNC connectors) 2950-0054 Hex nut (for rear-panel BNC connectors) Bottom foot (Refer to “External Hardware and Miscellaneous Parts, All Options” on page 6-95.) Keysight N5227A Service Guide 6-83...
  • Page 252 Hex nut (for item 8120-5063 BNC cable 6960-0523 Hole plug 6960-0076 Hole plug 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. 6-84 Keysight N5227A Service Guide...
  • Page 253 Replaceable Parts Replaceable Parts Listings Figure 6-33 Rear-panel Assembly, All Options Keysight N5227A Service Guide 6-85...

  • Page 254: Fan Assemblies, All Options

    Fan bracket (for 3 fans)  0515-0372 Machine screw, M3.0 x 8, pan head (To attach: fan assemblies to chassis)  Chassis (Refer to “Internal Hardware and Miscellaneous Parts, All Options” on page 6-93.)  6-86 Keysight N5227A Service Guide...
  • Page 255 Replaceable Parts Replaceable Parts Listings Figure 6-34 Fan Assemblies, Side View, All Options Keysight N5227A Service Guide 6-87...

  • Page 256: Top Hardware And Miscellaneous Parts, All Options

    Machine screw, M3.0 x 20, flat head (To attach source brackets to source (1) and source (2). Not shown 0515-0666 Machine screw, M3.0 x 18, pan head (To attach source brackets to source (1) and source (2). 6-88 Keysight N5227A Service Guide...
  • Page 257 Replaceable Parts Replaceable Parts Listings Figure 6-35 Top Hardware and Miscellaneous Parts, Top View, All Options Keysight N5227A Service Guide 6-89...

  • Page 258: Bottom Hardware And Miscellaneous Parts

    Brace, 4-port (To connect port 3 & port 4 attenuator/receiver coupler assemblies.) 0515-0375 Machine screw, M3.0 x 16, pan head (To attach 70 GHz doublers to doubler mounts.) N5247-20132 Side brace (To attach attenuator/receiver coupler assemblies to test set.) 6-90 Keysight N5227A Service Guide...
  • Page 259 Machine screw, M4.0 x 0.7, pan head (To attach A24 IF MUX to test set deck.) shown N5242-00019 Stabilizer bracket (Between A23 test set motherboard and A24 IF mux board.) N5247-00017 Cross bracket on test set deck Keysight N5227A Service Guide 6-91...
  • Page 260 Replaceable Parts Replaceable Parts Listings Figure 6-36 Bottom Hardware and Miscellaneous Parts 6-92 Keysight N5227A Service Guide...

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

    N5247-00013 Front bracket  N5242-40002 PC board guides  Keysight N5227A Service Guide 6-93...
  • Page 262 Replaceable Parts Replaceable Parts Listings Figure 6-37 Internal Hardware and Miscellaneous Parts, All Options 6-94 Keysight N5227A Service Guide...

  • Page 263: External Hardware And Miscellaneous Parts, All Options

    Machine screw, M3.0 x 6, flat head (To attach: inner cover; front-panel.)  Not shown 5023-1399 Front handle 5041-9174 Side strips for front handle 0515-2044 Machine screw, M4.0 x 12 flat head (To attach front handle to chassis.) N5245-40001 Front impact cover N5245-40002 Rear impact cover Keysight N5227A Service Guide 6-95...

  • Page 264: Miscellaneous Part Numbers

    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 9 mm open-end torque wrench; 2.38 N-m (21 in-lb) Not sold by Keysight Spanner wrench 08513-20014 6-96 Keysight N5227A Service Guide...
  • Page 265 Installation and Quick Start Guide (for all PNA series analyzers) (Cannot be ordered. Part number E8356-90001 is for reference only. Must be printed from the Keysight Web site.) Service Guide. (Not available in printed form. Part number is for reference only. Must be printed N5227-90001 from the Keysight Web site.)
  • Page 266 N5231AU-1CP or 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) 6-98 Keysight N5227A Service Guide...
  • Page 267 Replaceable Parts Replaceable Parts Listings 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 N5227A Service Guide 6-99...
  • Page 268 Replaceable Parts Replaceable Parts Listings 6-100 Keysight N5227A Service Guide...
  • Page 269 Keysight Microwave Network Analyzers 2-Port and 4-Port PNA Series Service Guide Repair and Replacement Procedures Before replacing the A23 board, if possible: Run EEBackup.exe using the directory for your Windows operating system: Windows 7 OS: C:/Program Files (x86)/Agilent/Network Analyzer/Service/EEBackup.exe. Click on Save EEPROM Backup, and then click on Backup TSMB Memory.
  • Page 270 Repair and Replacement Procedures Information in This Chapter Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Keysight Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content...
  • Page 271 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 N5227A Service Guide...
  • Page 272 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 N5227A Service Guide...
  • Page 273 Port 3 receiver coupler Port 4 receiver coupler Port 2 receiver coupler Port 1 test port coupler page 7-39 Port 3 test port coupler Port 4 test port coupler Port 2 test port coupler Reference mixer switch page 7-41 Keysight N5227A Service Guide...
  • Page 274 If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your option-model in Chapter 6 “Bottom Assemblies and Cables by Option Set:” on page 6-9. Keysight N5227A Service Guide...
  • Page 275 Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5227A Service Guide...
  • Page 276 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 7-60. Keysight N5227A Service Guide...
  • Page 277 PC board. Removing the Inverter Board  1. Disconnect the inverter board cable (item ) and the LCD cable (item from the inverter board.  2. Remove two screws (item ) and remove the inverter board. Keysight N5227A Service Guide...
  • Page 278 ) before separating the LCD display from the hold down bracket. 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 7-60. 7-10 Keysight N5227A Service Guide...
  • Page 279 Note the location of each cable for reinstallation. b. Lift the two extractors, one at each end of the board, and lift the board. c. Before removing the board, check the bottom of the board for any attached cables. Keysight N5227A Service Guide 7-11...
  • Page 280 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 7-60 7-12 Keysight N5227A Service Guide...

  • Page 281: Removing And Replacing The A18 System Motherboard

    A18 System Motherboard. Refer to Figure 6-37 on page 6-94 for steps 14 and 15. 1. Remove four screws (item A) that secure the bottom of the midplane bracket to the chassis. Keysight N5227A Service Guide 7-13...
  • Page 282 Keep them for reinstallation on the replacement 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 7-60. 7-14 Keysight N5227A Service Guide...
  • Page 283 Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard Figure 7-1 A18 System Motherboard Removal Keysight N5227A Service Guide 7-15...

  • Page 284: 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 7-60. 7-16 Keysight N5227A Service Guide...
  • Page 285 Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Figure 7-2 A19 Midplane Board Removal Keysight N5227A Service Guide 7-17...

  • Page 286: 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 7-60. 7-18 Keysight N5227A Service Guide...
  • Page 287 Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Figure 7-3 A20 Power Supply Assembly Removal Keysight N5227A Service Guide 7-19...

  • Page 288: Removing And Replacing The A21 Cpu Board Assembly

    (SSD)” on page 7-48. 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 7-60. 7-20 Keysight N5227A Service Guide...
  • Page 289 Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Figure 7-4 A21 CPU Board Assembly Removal Keysight N5227A Service Guide 7-21...

  • Page 290: 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 7-60. 7-22 Keysight N5227A Service Guide...
  • Page 291 Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Figure 7-5 A22 GPIB Board Removal Keysight N5227A Service Guide 7-23...

  • Page 292: Removing And Replacing The A23 Test Set Motherboard

    Click on Save EEPROM Backup, and then click on Backup TSMB Memory. Windows 10 OS (32-bit): C:/Program Files (x86)/Keysight/Network Analyzer/Service/EEBackup.exe. Click on Save EEPROM Backup, and then click on Backup TSMB Memory. The firmware revision numbers for Win10 (32-bit) are A.13.30.xx through A.13.95.xx.
  • Page 293 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 7-60. Keysight N5227A Service Guide 7-25...
  • Page 294 Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard This page intentionally left blank. 7-26 Keysight N5227A Service Guide...
  • Page 295 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 7-60. Keysight N5227A Service Guide 7-27...
  • Page 296 Repair and Replacement Procedures Removing and Replacing the A24 IF Multiplexer Board Figure 7-6 A24 IF Multiplexer Board Removal 7-28 Keysight N5227A Service Guide...

  • Page 297: Removing And Replacing The A25 Hma26.5

    If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, Chapter 6 refer to your option-model in Keysight N5227A Service Guide 7-29...
  • Page 298 Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Figure 7-7 A25 HMA26.5 Removal 7-30 Keysight N5227A Service Guide...

  • Page 299: Verify The Model/Version Of Hma26.5 Installed

    — W63 N5245-20023 — W64 N5245-20022 The new N5240-60101 HMA26.5 has the splitter integrated into the assembly. Refer to Figure 7-8 on page 7-31. Figure 7-8 Comparison of Legacy HMA26.5 (5087-7765) and New HMA26.5 (N5240-60101) Keysight N5227A Service Guide 7-31...

  • Page 300: Removing And Replacing The A26 Splitter

    If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your Chapter 6 option-model in 7-32 Keysight N5227A Service Guide...
  • Page 301 If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your Chapter 6 option-model in Keysight N5227A Service Guide 7-33...

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

    9. If replacing a mixer brick, remove 3 screws (not shown) that fasten each mixer brick to the mixer brick mounting block.  10. If replacing the A28 mixer brick, remove the 3 dB pads (item ) and keep it for reinstallation on the replacement mixer brick. 7-34 Keysight N5227A Service Guide...
  • Page 303 If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your Chapter 6 option-model in Keysight N5227A Service Guide 7-35...

  • Page 304: Brackets

    Orient the position of the receiver couplers and brackets as shown in Figure 7-12. 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 7-60. 7-36 Keysight N5227A Service Guide...
  • Page 305 If you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7 and Figure 7-8 on page 31 and for details on A26 splitter and cabling, refer to your Chapter 6 option-model in Keysight N5227A Service Guide 7-37...
  • Page 306 Repair and Replacement Procedures Removing and Replacing the A29 –A32 Receiver Couplers and Receiver Coupler Mounting Brackets Figure 7-12 Orientation of Receiver Couplers with Brackets 7-38 Keysight N5227A Service Guide...

  • Page 307: Removing And Replacing The A33-A36 Test Port Couplers

    Torque all connectors to 10 in-lbs. Torque coupler nuts to 72 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-60. Keysight N5227A Service Guide 7-39...
  • Page 308 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Figure 7-13 A33 through A36 Test Port Couplers Removal 7-40 Keysight N5227A Service Guide...

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

    ) and torque the connectors to 10 in-lbs, then tighten the  two mounting screws (item 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-60. Keysight N5227A Service Guide 7-41...
  • Page 310 Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Figure 7-14 A37 Reference Mixer Switch Removal 7-42 Keysight N5227A Service Guide...
  • Page 311 8. Remove two screws from each attenuator to be removed from the mounting bracket. Keysight N5227A Service Guide 7-43...
  • Page 312 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 7-60. Figure 7-15 Source and Receiver Attenuators 7-44 Keysight N5227A Service Guide...
  • Page 313 Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Figure 7-16 Orientation of Source and Receiver Attenuators with Brackets Keysight N5227A Service Guide 7-45...

  • Page 314: Removing And Replacing The A42-A45 Bias Tees

    Orient the position of the bias tees and block as shown in Figure 7-18. 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 7-60. 7-46 Keysight N5227A Service Guide...
  • Page 315 Repair and Replacement Procedures Removing and Replacing the A42–A45 Bias Tees Figure 7-17 A42 through A45 Bias Tees Removal Figure 7-18 Orientation of Bias Tees with Block Keysight N5227A Service Guide 7-47...

  • Page 316: Removing And Replacing The A55 Solid State Drive (Ssd)

    — If installing an SSD for Windows XP: if the user has loaded unique calibration kit information, navigate to C:\Program Files\Keysight\Network Analyzer and copy USER_CALKITFILE to a USB flash memory drive. Also copy any personal user files that you wish to preserve.
  • Page 317 Install Backup Files onto the New Solid State Drive The files that were previously saved onto a USB flash memory drive must now be installed onto the new SSD. The network analyzer must be powered up and operating. Keysight N5227A Service Guide 7-49...

  • Page 318: Removing And Replacing The A60-A63 70 Ghz Doublers

    Disconnect these cables and remove the doubler mounting bracket, with the two doublers attached, from the analyzer. 9. Remove three screws that attach the doubler to be replaced to its mounting bracket, and remove the doubler from the bracket. 7-50 Keysight N5227A Service Guide...
  • Page 319 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 7-60. Figure 7-20 A60 through A63 70 GHz Doublers Removal Keysight N5227A Service Guide 7-51...

  • Page 320: Removing And Replacing The Rear Panel

    10. 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 7-60. 7-52 Keysight N5227A Service Guide...
  • Page 321 Repair and Replacement Procedures Removing and Replacing the Rear Panel Figure 7-21 Rear Panel Removal Keysight N5227A Service Guide 7-53...

  • Page 322: Removing And Replacing The Front Panel Led Boards

    6-36 on page 6-92. 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 7-60. 7-54 Keysight N5227A Service Guide...
  • Page 323 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards This page intentionally left blank. Keysight N5227A Service Guide 7-55...

  • Page 324: Removing And Replacing The Fans

    Pull up the center pin of each of the fan rivets as shown by (item in the illustration.  c. Pull out the rivet completely (as shown by (item ) in the illustration) to release the fan and fan guard. 7-56 Keysight N5227A Service Guide...
  • Page 325 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 7-60. Figure 7-22 B1 Fan Removal Keysight N5227A Service Guide 7-57...

  • Page 326: 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 7-60. 7-58 Keysight N5227A Service Guide...
  • Page 327 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-23 Lithium Battery Removal Keysight N5227A Service Guide 7-59...

  • Page 328: Post-Repair Procedures

    A4 13.5 GHz source 1 synthesizer EE Default Adjustment: Synth Src1 Frequency Accuracy Test board only Source Power Accuracy Test Synthesizer Bandwidth Source Maximum Power Output Adjustment Test Source Adjustment Source Power Linearity Test Receiver Adjustment The Operator’s Check 7-60 Keysight N5227A Service Guide...
  • Page 329 Source Maximum Power Output Test Source Power Linearity Test The Operator’s Check A14 frequency reference board 10 MHz Frequency Reference Frequency Accuracy Test Adjustment Restore option data (Refer to “Repairing and Recovering Option Data” Chapter Keysight N5227A Service Guide 7-61...
  • Page 330 Source Power Accuracy Test EE Default Adjustment: LO Drive Source Maximum Power Output Noise Figure only (Option 029 equipped Test PNA) Source Power Linearity Test IF Gain Adjustment The Operator’s Check Receiver Characterization Receiver Adjustment 7-62 Keysight N5227A Service Guide...
  • Page 331 Resetting the Mechanical Counter A55 solid state drive Restore previously saved receiver Read and write to the drive calibration data (or perform Receiver Adjustment) B1 fan No adjustment needed Check for fan operation Battery No adjustment needed None Keysight N5227A Service Guide 7-63...
  • Page 332 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.” 7-64 Keysight N5227A Service Guide...
  • Page 333 1. Click Utility > System > Service > Diagnostics > Mechanical Counter 2. In the Mechanical Cycle Counter window that opens: a. Click all of the items that apply. b. When satisfied, click on Modify. c. Click Exit. Figure 7-24 Mechanical Cycle Counter window Keysight N5227A Service Guide 7-65...

  • Page 334: Eeprom Backup

    To store the backup data, perform these steps: — Navigate to the EEPROM Backup Utility, located at: — Windows 7 -- C:\Program Files (x86)\Keysight\Network Analyzer\Service\eebackup.exe — Windows 10 -- C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program.

  • Page 335: 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 336: 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 N5227A Service Guide...

  • Page 337: 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 N5227A Service Guide...
  • Page 338 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 N5227A Service Guide...
  • Page 339 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 N5227A Service Guide...

  • Page 340: 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 N5227A Service Guide...
  • Page 341 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 N5227A Service Guide...

  • Page 342: Error Term Data

    All crosstalk values are typical. Measurement conditions: normalized to a thru, measured with two shorts, 10 Hz IF bandwidth, averaging factor of 8, alternate mode, source power set to the lesser of the maximum power out or the maximum receiver power. Keysight N5227A Service Guide...
  • Page 343 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 N5227A Service Guide...
  • Page 344 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 4-46 or to “Checking the Signal Separation Group” on page 4-41. 8-10 Keysight N5227A Service Guide...

  • Page 345: Option Enable Utility

    Using the current Host ID will cause a license to be generated that will not work with the instrument. To determine the new Host ID, refer “Identifying Your Instrument’s Host ID” on page 8-12. Keysight N5227A Service Guide 8-11...

  • Page 346: Enabling Or Removing Options

    HostID number of the PNA. This HostID number is NOT the one currently shown on the PNA. To determine your new HostID, Keysight personnel should use the new model number with the utility at go http://mktwww.srs.is.keysight.com/field/service/network/pna/upgrades.

  • Page 347: Repairing And Recovering Option Data

    If the data stored in either of these items is lost, it can be recovered from the other item. If the data on both the hard disk drive and the frequency reference board is lost, it can not be recovered. Contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-6.

  • Page 348: Installing Or Changing A Serial Number

    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 2-6. Installing or Changing a Serial Number It is necessary to reinstall the instrument serial number if the test set motherboard is replaced.

  • Page 349: Firmware Upgrades

    Firmware Upgrades 3. If an error is made in entering the serial number, obtain a clear code from 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.

  • Page 350: Operating System Recovery

    Recovering from Hard Disk Drive Problems If you suspect that you have a hard disk drive problem, go to the “Hard Drive Recovery” link on the Keysight PNA Series: Service & Support Home Page on the Internet. The URL for the Keysight PNA Series: Service & Support Home Page is: https://support.keysight.com/s/...

  • Page 351: A:.eeprom Address Assignments And Location

    Keysight Technologies - Appendix N52xxA/B Microwave Network Analyzers Service Guide EEPROM Address Assignments and Location (N5227A&B PNA and N5247A&B PNA-X Instruments) Table A-1 EEPROM Address Assignments and Location Hex Addr Physical Location Board Rev Letter Cal Body Contents E080 A16 SPAM...

  • Page 352: Instruments)

    EEPROM Address Assignments and Location (N5227A&B PNA and N5247A&B PNA-X Instruments) Table A-1 (Continued)EEPROM Address Assignments and Location Hex Addr Physical Location Board Rev Letter Cal Body Contents E600 A5 Source 1 Unused E680 – – E700 – – E780 –...
  • Page 353 7-17 part number 6-16 40 GHz doubler procedure 7-16 removal and replacement See A7 - A8, A12 - A13 A2 USB board illustrated 7-12 , 6-48, 6-55, 6-63 illustrated 6-14 procedure 70 GHz doubler 7-11 Keysight N5227A Service Guide...
  • Page 354 6-42, 6-49, 6-56, 6-65, 6-73 , 6-48, 6-55, 6-63, operation 6-41, 6-48, 6-55, 6-63, 6-71 5-21 6-71 removal and replacement part number removal and replacement , 6-22, 6-28, 6-35, illustrated illustrated 7-30 6-41, 6-48, 6-55, 6-63, 6-71 7-37 Keysight N5227A Service Guide...
  • Page 355 7-43 procedure 7-50 illustrated , 6-42, 6-73 troubleshooting 4-48 A61 port 3 70 GHz doubler part number , 6-41, 6-71 A48 test port 4 receiver step illustrated , 6-49, 6-56, 6-65, 6-73 removal and replacement attenuator Keysight N5227A Service Guide...
  • Page 356 5-25 dynamic accuracy test power supply 3-39 signal separation frequency test receiver group 3-34 group 5-20 adding signal separation solid state drive 5-34 options 8-12 synthesized source source boards 5-14 adjustments Keysight N5227A Service Guide...
  • Page 357 6-45 removal and replacement part numbers 6-43 C receiver illustrated 7-57 replaceable ribbon cables troubleshooting 4-30 procedure illustrated 7-56 6-47 typical power output 4-42 bandwidth, synthesizer part numbers 6-46 C, D, R3, and R4 traces Keysight N5227A Service Guide...
  • Page 358 5-32 connector repeatabili- rear panel , 5-15, 5-16, 5-26, 5-34 failure Display D receiver 5-34 3-20 troubleshooting 4-30 insertion loss, failure typical power output 4-42 , 5-15, 5-16 D, C, R3 and R4 traces 3-17 Keysight N5227A Service Guide...
  • Page 359 70 GHz operation 5-32 port 1 monitoring over time parts list 6-12 See A60 shape affected by removal source match port 2 replacement typical data See A63 using as diagnostic tool port 3 Keysight N5227A Service Guide...
  • Page 360 6-12 , 4-14, removal and replacement trim strip, filler illustrated 4-16 7-57 illustrated 6-11 inverter board procedure 7-56 part number illustrated 6-10 troubleshooting 6-14 4-13 troubleshooting part number 4-16 feet 6-12 USB board analyzer keypad assembly Keysight N5227A Service Guide...
  • Page 361 5-34 options 8-12 replaceable hardware cross-over cable 4-26 illustrated IP address 6-94 4-23 See A55 part numbers ping command 6-93 4-23 high dynamic range ping to and from replaceable parts 4-22 Keysight N5227A Service Guide...
  • Page 362 6-83 description of 3-12 OCXO (oven-controlled crystal magnitude check dialog box 3-13 oscillator) failure of 3-19 failure of 3-14 frequency adjustment 3-41 test port cables 3-17 performing 3-12 theory of operation 5-15 maintenance option Keysight N5227A Service Guide...
  • Page 363 1-4, typical power pin assignments 5-18 description of output 4-42 post-repair procedures dynamic accuracy 7-60 3-39 power button keypad frequency removal and replacement accuracy 3-34 procedure 7-10 noise floor 3-37 receiver power supply assembly receiver troubleshooting 4-30 Keysight N5227A Service Guide...
  • Page 364 4-42 See A31 illustrated 6-14 troubleshooting troubleshooting See section in Chapter 6 , 4-30, 4-44 recovery titled Replaceable Parts 4-42 operating system Listings typical power 8-16 option data replaceable RF cables 8-13 Keysight N5227A Service Guide...
  • Page 365 3-25 step attenuator post-repair 7-60 verification kits 3-25 removal warnings about supplies replacement static safety parts battery 7-44 part numbers part number 6-98 6-97 troubleshooting 4-44 test equipment source 1 board required part numbers 6-98 Keysight N5227A Service Guide...
  • Page 366 See A40 failure flowchart See A60 3-27 test port cable failure of bias tee 3-26 checks 3-12 See A42 getting ready accessories used coupler interpreting 3-14 See A33 results 3-27 connector receiver coupler performing 3-23 repeatability Keysight N5227A Service Guide...
  • Page 367 C, D, R3, and R4 A45 test port 2 bias tee 4-44 troubleshooting rear panel 4-33 4-21 A46 test port 1 receiver step trim strip, filler rear-panel USB 4-21 attenuator 4-48 front panel receiver A , 4-30, 4-42 Keysight N5227A Service Guide...
  • Page 368 5-34 board See A2 port rear panel warm up connector 5-34 analyzer rear panel warning troubleshooting 4-21 for servicing USB board warranty front panel service illustrated 6-14 one-year return USB controller board Keysight front panel standard Keysight N5227A Service Guide...
  • Page 369 Installation Note Xxxxx-xxxxx...
  • Page 370 This information is subject to change without notice. © Keysight Technologies 2011-2023 Edition 1, March 2023 N5227-90001 www.keysight.com...

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