Keysight N5244A Service Manual
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Keysight N5244A Service Manual

2-port and 4-port pna-x microwave network analyzers
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Table of Contents

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Download this manual See also: Configuration Manual
Keysight
2-Port and 4-Port
PNA-X Microwave Network Analyzers
This manual provides documentation for the
following models:
N5244A (10 MHz -43.5 GHz) and
N5245A (10 MHz-50 GHz)
Service Guide

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Summary of Contents for Keysight N5244A

  • Page 1 Keysight 2-Port and 4-Port PNA-X Microwave Network Analyzers This manual provides documentation for the following models: N5244A (10 MHz -43.5 GHz) and N5245A (10 MHz-50 GHz) Service Guide...

  • Page 2: Safety Notices

    PERFORMANCE OF THIS to the public to use, modify, DOCUMENT OR ANY INFORMATION reproduce, release, perform, CONTAINED HEREIN. SHOULD display, or disclose commercial KEYSIGHT AND THE USER HAVE A computer software or SEPARATE WRITTEN AGREEMENT commercial computer software WITH WARRANTY TERMS...

  • Page 3: Table Of Contents

    Keysight Support, Services, and Assistance ........
  • Page 4 Noise Figure Adjustment (Available with Option H29 Installed) ....3-55 Noise Figure Adjustment (Available with Option 029 Installed)....3-58 Keysight N5244A/45A Service Guide...
  • Page 5 Microwave PNA, N5244A/45A 2-Port ........
  • Page 6 A9 Noise Receiver Board ..........5-40 6. Replaceable Parts Keysight N5244A/45A Service Guide...
  • Page 7 Removing and Replacing the Front Panel Assembly....... 7-9 Keysight N5244A/45A Service Guide...
  • Page 8 Information in This Chapter ........... 8-1 Keysight N5244A/45A Service Guide...
  • Page 9 Storing Correction Constants..........8-17 Keysight N5244A/45A Service Guide...
  • Page 10 Contents Keysight N5244A/45A Service Guide...

  • Page 11: Safety And Regulatory Information

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA-X 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 N5244A/45A Service Guide...

  • Page 13: General Safety Considerations

    Degree 2 per IEC 61010-1:2001 and 664 respectively. 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 N5244A/45A Service Guide...
  • 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 N5244A/45A 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 N5244A/45A 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 “ESD Supplies” on page 6-181 wrist strap. Refer to for part numbers. Keysight N5244A/45A Service Guide...
  • Page 18 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-2 ESD Protection Setup Keysight N5244A/45A Service Guide...

  • Page 19: Regulatory Information

    This is a marking to indicate product compliance with the Canadian Interference-Causing ICES/NMB-001 Equipment Standard (ICES-001). Direct Current. IP 2 0 The instrument has been designed to meet the requirements of IP 2 0 for egress and operational environment. Keysight N5244A/45A Service Guide...

  • Page 20: 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 “Contacting the battery to Keysight Technologies for disposal. Refer to Keysight” on page 2-7 for assistance.

  • Page 21: General Product Information

    Keysight Support, Services, and The Internet address (URL) for on-line assistance. page 2-7 Assistance Service and support options available. Calibration options available. Important information about shipping your analyzer to Keysight for service or repair.

  • Page 22: 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 “Review the Principles of Connector Care” on page 3-5. Refer to Keysight N5244A/45A Service Guide...

  • Page 23: Analyzer Options, Accessories, And Upgrades Available

    Analyzer Options, Accessories, and Upgrades Available Analyzer Options, Accessories, and Upgrades Available To see a list of the options, accessories, and upgrades available for the network analyzers, including ordering information, refer to the Keysight PNA Family Microwave Network Analyzers Configuration Guide, available online at http://literature.cdn.keysight.com/litweb/pdf/5990-7745EN.pdf.

  • Page 24: Required Service Test Equipment

    The Z5623A has been discontinued, but it or the U3070A-K01 can be used. g. The recommended model or part number for all equipment listed with a “P” in the Use column is required for proper operation of this test software. Keysight N5244A/45A Service Guide...
  • Page 25 T-8 TORX driver 0.6 N-m (5 in-lb) setting T-10 TORX driver 0.5, 0.8, and 1.0 N-m (4, 7, and 9 in-lb) settings T-20 TORX driver 2.4 N-m (21 in-lb) setting 1/4-inch and 5/16-inch Thin profile 8710-0510 open-end wrench Keysight N5244A/45A Service Guide...
  • Page 26 USB flash ROM drive None P,A,R a. Unless specified otherwise, equipment listed is required for all analyzer models. b. P = Performance tests, A = Adjustments, T = Troubleshooting, R = Repair, V = System verification Keysight N5244A/45A Service Guide...

  • Page 27: Keysight Support, Services, And Assistance

    Service and Support Options The analyzer’s standard warranty period is three-years 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 28: 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 29: Tests And Adjustments

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA-X Service Guide Tests and Adjustments Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your PNA. — The checks verify the operation of the assemblies in your analyzer.
  • Page 30 Receiver Compression Test Noise Floor Test — Calibration Coefficients Test — — Dynamic Accuracy Test – Version 1 System Noise Figure Test — Noise Jitter Test — — Noise Receiver Linearity Test Noise Receiver Compression Test — Keysight N5244A/45A Service Guide...
  • Page 31 Noise Figure Adjustment (Available with Option 029 Installed) 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 N5244A/45A Service Guide...

  • Page 32: Before You Begin

    To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-7, for all of the procedures in this chapter. Keysight N5244A/45A Service Guide...

  • Page 33: Allow The Analyzer To Warm Up

    — Use correct end of calibration block — Gage all connectors before first use Making Connections — Align connectors carefully Do Not — Apply bending force to connection — Make preliminary connection contact — Over tighten preliminary connection lightly Keysight N5244A/45A Service Guide...
  • Page 34 Cleaning connectors with alcohol shall only be done with the instrument’s power cord removed, and in a well-ventilated area. Allow all residual alcohol moisture to evaporate, and the fumes to dissipate prior to energizing the instrument. Keysight N5244A/45A Service Guide...

  • Page 35: About System Verification And Performance Tests

    System specifications are applicable only when the measurement system is used to make error-corrected measurements. The analyzer's system specifications are described in the Keysight PNA Series Network Analyzer Technical Specifications and also in the analyzer’s on-line help system in the section titled “Corrected System Performance”.

  • Page 36: Instrument Specifications

    Tests and Adjustments About System Verification and Performance Tests Instrument Specifications The analyzer's instrument specifications are described in the Keysight PNA Series Network Analyzer Technical Specifications and also in the analyzer’s on-line help system in the sections titled “Uncorrected System Performance”, “Test Port Output”, and “Test Port Input”.

  • Page 37: Certificate Of Calibration

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

  • Page 38: Ansi/Ncsl Z540.3-2006 And Iso/Iec 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 N5244A/45A Service Guide...

  • Page 39: Non-Standards Compliant Verification

    Troubleshoot and repair the first problem encountered without continuing to other tests. After you troubleshoot, repair, and adjust, repeat the last failed portion and generate a new set of data. Figure 3-2 Non–Standards Compliant Verification Flowchart Keysight N5244A/45A Service Guide 3-11...

  • Page 40: Preliminary Checks

    Shorts/Opens are attached to ALL ports, to run through the test without stopping. Shorts and opens can be mixed on the test ports. 3. Click Begin. 3-12 Keysight N5244A/45A Service Guide...
  • Page 41 Figure 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. Keysight N5244A/45A Service Guide 3-13...
  • Page 42 Tests and Adjustments Preliminary Checks Figure 3-3 Operator’s Check Dialog Boxes 3-14 Keysight N5244A/45A Service Guide...

  • Page 43: 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. Keysight N5244A/45A Service Guide 3-15...
  • Page 44 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. 3-16 Keysight N5244A/45A Service Guide...
  • Page 45 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. Keysight N5244A/45A Service Guide 3-17...
  • Page 46 ON. Average on/OFF 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 3-18 Keysight N5244A/45A Service Guide...
  • Page 47 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 Keysight N5244A/45A Service Guide 3-19...
  • Page 48 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. 3-20 Keysight N5244A/45A Service Guide...
  • Page 49 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. Keysight N5244A/45A Service Guide 3-21...

  • Page 50: 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: 3-22 Keysight N5244A/45A Service Guide...

  • Page 51: 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 52: 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 3-24 Keysight N5244A/45A Service Guide...
  • Page 53 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. Keysight N5244A/45A Service Guide 3-25...
  • Page 54 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 “Equipment Used in the System Verification Procedure.” previous table, Refer to the cable’s user’s guide for specifications.
  • Page 55 3-13 on page 3-31. — File Tabular Data: Writes the tabular data to a text file in the Windows XP directory C:\Program Files\Keysight\Network Analyzer\Documents or the Windows 7 directory C:\Users\Public\Public Documents\Network Analyzer\Documents\SysVer. — File Graphs: Saves a screen image in PNG format in the Windows XP...
  • Page 56 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. 3-28 Keysight N5244A/45A Service Guide...
  • Page 57 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 Keysight N5244A/45A Service Guide 3-29...
  • Page 58 — 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 Figure 3-13. system. Labeled as C in 3-30 Keysight N5244A/45A Service Guide...
  • Page 59 Tests and Adjustments System Verification Figure 3-13 Example of Printed Graphical Verification Results Keysight N5244A/45A Service Guide 3-31...

  • Page 60: Performance Tests

    — Power meter — Power sensors — Any necessary adapters Description of the Test: 1. The analyzer is Preset. 2. The analyzer is set up for a CW reflection measurement on the test port to be measured. 3-32 Keysight N5244A/45A Service Guide...

  • Page 61: Source Maximum Power Output Test

    The output power is then decreased in increments of 0.01 dB until the error goes away. if the output power reaches +18 dBm without any error, the power is left at this level. Keysight N5244A/45A Service Guide 3-33...

  • Page 62: Source Power Linearity Test

    Preset and the change in the receiver power reading. 7. This power linearity measurement is repeated at several CW frequencies across the full frequency range of the analyzer. If the Analyzer Fails this Test: 3-34 Keysight N5244A/45A Service Guide...

  • Page 63: Frequency Accuracy Test

    — Verify the accuracy of the 10 MHz OCXO by using a frequency counter to measure the rear-panel 10 MHz REF OUT. If the 10 MHz reference is off by “10 MHz Frequency Reference Adjustment” more than 10 Hz, perform the on page 3-49 and then repeat this test. Keysight N5244A/45A Service Guide 3-35...

  • Page 64: Trace Noise Test

    A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5201 and above)” on page 7-18. — If the analyzer still fails this test, replace the mixer module for the failing receiver, and then repeat this test. 3-36 Keysight N5244A/45A Service Guide...

  • Page 65: Receiver Compression Test

    8. The first test set output attenuator is set to 20 dB. 9. The magnitude and phase measurements using the receiver under test are read: (Pb). 10.The second test set output attenuator is set to 20 dB. Keysight N5244A/45A Service Guide 3-37...

  • Page 66: Noise Floor Test

    5. For hundreds of frequencies across the analyzer’s full range, a source power calibration is performed to ensure a flat power response at the end of the cable at the Preset power level. 3-38 Keysight N5244A/45A Service Guide...

  • Page 67: Calibration Coefficients Test

    1. A test cable is connected to Port 1. 2. A calibration is performed between the end of the test cable and Port 2. The Port 2 directivity and source match and the S21 load match are retrieved from the analyzer. Keysight N5244A/45A Service Guide 3-39...

  • Page 68: Dynamic Accuracy Test - Version 1

    2. The analyzer’s source port is connected to the dynamic accuracy test set’s source port and the analyzer’s receiving port is connected to the dynamic accuracy test set’s receiver port. A power sensor is connected to the dynamic accuracy test set’s power meter port. 3-40 Keysight N5244A/45A Service Guide...

  • Page 69: Dynamic Accuracy Test - Version 2

    This description applies to all N522xA, N5231A/32A/34A/35A/39A, and N5247A instruments. It also applies to N5241A/42A/44A/45A instruments with serial numbers greater than xx5240xxxx. It also applies to N5241A/42A/44A/45A instruments with serial numbers less than xx5240xxxx. For all other instruments, see test version 1. Keysight N5244A/45A Service Guide 3-41...
  • Page 70 +3 dBm to -63 dBm. 8. This test is repeated for each receiver. If the Analyzer Fails this Test: — If the analyzer fails this test, rerun the test. 3-42 Keysight N5244A/45A Service Guide...

  • Page 71: System Noise Figure Test

    8. This test is repeated for 2, 4, 8, and 24 MHz noise IF bandwid ths. If the Analyzer Fails this Test: A failure of this test indicates a fault in the noise receiver chain. This can indicate a faulty assembly or a loose cable. Keysight N5244A/45A Service Guide 3-43...

  • Page 72: Noise Jitter Test

    — If the analyzer still fails this test, replace the A7 Noise Receiver board and “Removing and Replacing the A4–A17 Boards (For repeat this test. Refer to analyzers with serial numbers prefixed MY/SG/US5150 and below)” on 3-44 Keysight N5244A/45A Service Guide...

  • Page 73: Noise Receiver Linearity Test

    This is the analyzer reference reading, Par. 6. A1 is changed to 2, 4, 6, 8 and 10 dB. At each point, delta power levels are read on the power meter, Pmd and the analyzer, Pad. Keysight N5244A/45A Service Guide 3-45...

  • Page 74: Noise Receiver Compression Test

    -52 dBm for the low band of the high gain stage. This range is too wide to get an accurate source power calibration for each gain stage using a standard power sensor. So the source power is calibrated at 3-46 Keysight N5244A/45A Service Guide...
  • Page 75 14.Steps 11 to 13 are repeated for each of the three gain stages. If the Analyzer Fails this Test: A failure of this test indicates a fault in the noise receiver chain. This can indicate a faulty assembly or a loose cable. Keysight N5244A/45A Service Guide 3-47...
  • Page 76 “Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5150 and below)” on page 7-15 “Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5201 and above)” on page 7-18. 3-48 Keysight N5244A/45A Service Guide...

  • Page 77: 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 N5244A/45A Service Guide 3-49...

  • Page 78: Synthesizer Bandwidth Adjustment

    Equipment Used for the Source Adjustment Equipment Type Model or Al ternate Model or Part Number Part Number Power meter E4418B/E4419B E4418A/E4419A Power sensor, 2.4 mm 8487A None Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007 3-50 Keysight N5244A/45A Service Guide...

  • Page 79: If Gain Adjustment

    2. Follow the instructions and prompts as they are displayed. Receiver Characterization This characterizes the receivers in your analyzer. Procedure Service Adjustments 1. Press UTILITY System , then , then , then click Receiver Characterization. Keysight N5244A/45A Service Guide 3-51...

  • Page 80: Receiver Adjustment

    RF Cable, 2.4 mm (f) to 2.4mm (f) 85133C 85133E Adapters may be required, depending on the equipment you use. Procedure 1. Connect the equipment as shown in Figure 3-16. Connect a GPIB cable between the network analyzer and the power meter. 3-52 Keysight N5244A/45A Service Guide...
  • Page 81 , then , then , then click Receiver Adjustment. 3. Ensure the GPIB settings are correct. 4. Follow the instructions and prompts as they are displayed. Figure 3-17 Equipment Setup 2 for the Receiver Adjustment Keysight N5244A/45A Service Guide 3-53...

  • Page 82: Ee Default Adjustment

    Procedure Service Adjustments 1. Press UTILITY , then , then , then click IF System Response Adjustment. 2. Follow the instructions and prompts as they are displayed. 3-54 Keysight N5244A/45A Service Guide...

  • Page 83: Noise Figure Adjustment (Available With Option H29 Installed)

    Create New to enter data for the noise source you are using. The PNA will automatically remember and use the last file selected. These files should normally reside in the C:\Program Files\Keysight\Network Analyzer\Noise directory, but can also exist elsewhere. Keysight N5244A/45A Service Guide...
  • Page 84 Although not shown in the following graphics, test port adapters for the PNA may be required for this procedure. See the table on the previous page for model numbers. Figure 3-20 Equipment Setup 1 for the Receiver Adjustment 3-56 Keysight N5244A/45A Service Guide...
  • Page 85 2 and the free end of the cable. Connect the ECal module directly to port 2 without using any adapters if possible. See Figure 3-22. Figure 3-22 Equipment Setup 3 for the Receiver Adjustment The entire procedure takes about 15 to 30 minutes. Keysight N5244A/45A Service Guide 3-57...

  • Page 86: Noise Figure Adjustment (Available With Option 029 Installed)

    2. On the PNA Noise Adjustment dialog box (see Figure 3-19): a. In “Select Adjustments,” leave all four adjustments selected by default. b. In “Power Meter” — Set the GPIB address to match the address of the power meter. 3-58 Keysight N5244A/45A Service Guide...
  • Page 87 Skip Zero and Cal before first use. Figure 3-23 PNA Noise Adjustment Dialog Box 3. Click Begin. 4. As shown in Figure 3-24, connect an RF cable between the network analyzer test ports 1 and 2. Keysight N5244A/45A Service Guide 3-59...
  • Page 88 6. When prompted, disconnect the sensor from the cable, and insert the ECal module between port 2 and the free end of the cable. Connect the ECal module directly to port 2 without using any adapters if possible. See Figure 3-26. 3-60 Keysight N5244A/45A Service Guide...
  • Page 89 Tests and Adjustments Adjustments Figure 3-26 Equipment Setup 3 for the Receiver Adjustment The entire procedure takes about 30 to 45 minutes. Keysight N5244A/45A Service Guide 3-61...
  • Page 90 Tests and Adjustments Adjustments 3-62 Keysight N5244A/45A Service Guide...

  • Page 91: Troubleshooting

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA-X 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 92: 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 N5244A/45A Service Guide...

  • Page 93: 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 N5244A/45A Service Guide...

  • Page 94: 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 N5244A/45A Service Guide...

  • Page 95: 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 N5244A/45A Service Guide...

  • Page 96: 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 97 Troubleshooting Getting Started with Troubleshooting Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” Go to “Front Panel Troubleshooting” “Rear Panel Go to Troubleshooting” Go to “Measurement System Troubleshooting” Keysight N5244A/45A Service Guide...

  • Page 98: Power Up Troubleshooting

    “Troubleshooting LCD Display but the display remains dark, go to Problems” on page 4-14. — If the instrument appears to abort the network analyzer measurement “Contacting Keysight” on interface process, contact Keysight. Refer to page 2-7. Keysight N5244A/45A Service Guide...

  • Page 99: Power Supply Check

    ACOM as ground reference for analog supplies and the point marked DCOM as ground reference for digital supplies. Figure 4-2 Refer to for the power supply measurement points on the A19 Table 4-1 on page 4-11 midplane board. Refer to for the correct voltages. Keysight N5244A/45A Service Guide...
  • Page 100 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 N5244A/45A Service Guide...
  • Page 101 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 Chapter 7for removal instructions). steps (refer to Keysight N5244A/45A Service Guide 4-11...
  • Page 102 “Removing and Replacing the A55 Solid State Drive (SSD)” on page 7-55). The minimum required assemblies to power up the analyzer are: — A20 power supply — A19 midplane board — A18 system motherboard — A21 CPU board 4-12 Keysight N5244A/45A Service Guide...
  • Page 103 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 N5244A/45A Service Guide 4-13...

  • Page 104: Troubleshooting Lcd Display Problems

    There are no front panel adjustments for intensity and contrast of the LCD 1. If the display is dim, the A3 display assembly is defective. Refer to “Removing and Replacing the A1–A3 and Other Front Panel Subassemblies” on page 7-11. 4-14 Keysight N5244A/45A Service Guide...
  • Page 105 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 N5244A/45A Service Guide 4-15...

  • Page 106: Front Panel Troubleshooting

    Service More Front Panel Test System Press UTILITY , then , then , then A Front Panel Key Test Utility dialog box will be displayed, as shown in Figure 4-4. 4-16 Keysight N5244A/45A Service Guide...
  • Page 107 “Removing the A1 Front Panel Interface Board and Keypad Assembly” on page 7-11. 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 N5244A/45A Service Guide 4-17...
  • Page 108 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 7-11. 4-18 Keysight N5244A/45A Service Guide...

  • Page 109: 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 the A2 USB Board” on page 7-11. Keysight N5244A/45A Service Guide 4-19...

  • Page 110: A1 Front Panel Interface Board

    Checking the Operation of the Key Pad Commands “Front Panel Keypad and RPG Test” To verify the key pad functionality, refer to on page 4-16. Checking the Display “A3 Display Test” on page 4-19. To verify the display functionality, refer to 4-20 Keysight N5244A/45A Service Guide...

  • Page 111: 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 N5244A/45A Service Guide 4-21...

  • Page 112: 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 N5244A/45A Service Guide...
  • Page 113 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 N5244A/45A Service Guide 4-23...
  • Page 114 Other software may behave somewhat differently, but basically the same. 1. The letters x represent the IP address of the other device on the network. 2. The letters x represent the IP address of the analyzer. 4-24 Keysight N5244A/45A Service Guide...
  • Page 115 A crossover cable can be made from a standard LAN cable by connecting pin 1 from each connector to pin 3 of the other connector, and pin 2 from each connector to pin 6 of the other connector. Keysight N5244A/45A Service Guide 4-25...
  • Page 116 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 N5244A/45A Service Guide...
  • Page 117 Troubleshooting Rear Panel Troubleshooting Figure 4-5 Construction of a Crossover Cable Keysight N5244A/45A Service Guide 4-27...

  • Page 118: Measurement System Troubleshooting

    Go to the Help About screen by pressing UTILITY , then , then About NA..Verify that the information displayed in this screen is correct for your analyzer. If any of the information is incorrect, contact Keysight “Contacting Keysight” on page 2-7. Technologies. Refer to 4-28...

  • Page 119: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)

    , then , then View EEPROM Headers Figure 4-6. . Refer to If the information is incorrect for any of the PC boards, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-7. Figure 4-6 EEPROM Header Info Dialog Window...
  • Page 120 — For 4-port analyzer models, traces A, B, C, D, and R1, R2, R3, and R4 are Figure 4-8. displayed in eight separate data windows as shown in Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly. 4-30 Keysight N5244A/45A Service Guide...

  • Page 121: Where To Begin Troubleshooting

    “Contacting — If a problem still exists, contact Keysight. Refer to Keysight” on page 2-7. — If any of the traces are not present, are noisy or distorted, or are at an incorrect level, then there is a problem with the analyzer’s measurement...
  • Page 122 Address box, click the down arrow and then click My Computer. In an open area of the My Computer window, click the right mouse button and then click Properties in the resulting pop-up menu. 4-32 Keysight N5244A/45A Service Guide...
  • Page 123 Troubleshooting Measurement System Troubleshooting Click the Hard ware tab, click Device Manager, and then expand Keysight PNA DSP Device in the resulting list. The following entry should be listed: Keysight Technologies DSP Driver #2 and should be enabled. 2. If the entry is not present or if the icon to the left of the name is a...

  • Page 124: Checking The Source Group

    Too many sections!Equipment Used for This Check Equipment Type Model or Al ternate 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 N5244A/45A Service Guide...
  • Page 125 — for LO related problems, continue testing at “Checking the A15 13.5 GHz LO Synthesizer Output”. — for source related problems, continue testing at “Checking the A4 and A17 Source Synthesizer Outputs” on page 4-37. Keysight N5244A/45A Service Guide 4-35...
  • Page 126 5. 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 4-36 Keysight N5244A/45A Service Guide...
  • Page 127 A4 source 1 synthesizer board or W2 at the A17 source 2 synthesizer board. (W2 and A17 are only available in 4-port models and 2-port models with Option 224.) 2. Disconnect W1 or W2 from J1207. Keysight N5244A/45A Service Guide 4-37...
  • Page 128 “Checking the A4 and A17 Source Synthesizer Outputs” are present, replace the appropriate source board. Refer to “Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5150 and below)” on page 7-15. 4-38 Keysight N5244A/45A Service Guide...

  • Page 129: Checking The Signal Separation Group

    Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter. 1. Turn off the analyzer power. 2. Unplug the power to the analyzer and disconnect all front and rear panel connections except installed jumpers. Keysight N5244A/45A Service Guide 4-39...
  • Page 130 , then Utilities Receiver Display , then 3. Set the sweep speed for a 10 second sweep: Press STIMULUS Sweep Sweep Time then . Set the time to 10.000 seconds in the Sweep Time box. 4-40 Keysight N5244A/45A Service Guide...
  • Page 131 Trace loss in the signal separation group is due to one or more of the following assemblies being defective: — A50, A51, A52, or A53 mechanical switch and A54 combiner (A54 is only available in 4-port models with Option 423 and 2-port models with Option 224.) Keysight N5244A/45A Service Guide 4-41...
  • Page 132 Set the spectrum analyzer to measure a signal at 800 MHz. 4. If the 800 MHz signal is not present and the analyzer has mechanical switches, continue testing at “Checking the A50, A51, A52, and A53 Mechanical Switches” on page 4-43. 4-42 Keysight N5244A/45A Service Guide...
  • Page 133 1. Locate the appropriate semirigid cable at the output of the mechanical switch to be checked: — Options 224 and 423 — Port 1; W106 of A50 — Port 2; W120 of A53 — Port 3; W112 of A51 — Port 4; W116 of A52 Keysight N5244A/45A Service Guide 4-43...

  • Page 134: Checking The Receiver Group

    “4-Port Configuration, Options 400/419/423” on page 6-109 — — “Bottom RF Cables, 4-Port, Options 400/419/423 (Ports 1 and 2)” on page 6-112 “Bottom RF Cables, 4-Port, Options 400/419/423 (Ports 3 and 4)” on — page 6-115 4-44 Keysight N5244A/45A Service Guide...
  • Page 135 — Receiver B; W64 of A27 — 4-port models — Receiver A; W61 of A27 — Receiver R1; W62 of A27 — Receiver R2; W63 of A27 — Receiver B; W64 of A27 — Receiver C; W68 of A28 Keysight N5244A/45A Service Guide 4-45...
  • Page 136 — Port 1; W98 of A46 — Port 2; W104 of A49 — Port 3; W100 of A47 — Port 4; W102 of A48 2. Disconnect the appropriate semirigid cable from the output of the step attenuator. 4-46 Keysight N5244A/45A Service Guide...
  • Page 137 MY/SG/US5150 and below)” on page 7-15. 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 7-34. Keysight N5244A/45A Service Guide 4-47...

  • Page 138: Instrument Block Diagrams Sheet 1

    Troubleshooting Instrument Block Diagrams Sheet 1 Instrument Block Diagrams Sheet 1 Microwave PNA, N5244A/45A 2-Port 4-48 Keysight N5244A/45A Service Guide...
  • Page 139 N5244A/45A 2-Port Overall Block Diagram (Includes Options 200-Standard; 219-Attenuators and Bias Tees; and 224-Second Source, Combiner, OPTION 200 and Source Bypass Switches) DISPLAY USB BD A24 IF MULTIPLEXER RCVR A IN A16 SIGNAL PROCESSING Service Guide: N5245-90001 ADC MODULE (SPAM)

  • Page 140: Instrument Block Diagrams Sheet 2

    Troubleshooting Instrument Block Diagrams Sheet 2 Instrument Block Diagrams Sheet 2 Microwave PNA, N5244A/45A 2-Port with Option 029 and H85 4-50 Keysight N5244A/45A Service Guide...
  • Page 141 N5244A/45A 2-Port Overall Block Diagram (Includes Options 200-Standard; 219-Attenuators A46 STEP and Bias Tees; 224-Second Source, Combiner, and ATTEN Source Bypass Switches; H85-Delete Bias Tees; DISPLAY USB BD A24 IF MULTIPLEXER RCVR A IN A16 SIGNAL PROCESSING H29-Noise Figure Measurements to 26.5 GHz)

  • Page 142: Instrument Block Diagrams Sheet 3

    Troubleshooting Instrument Block Diagrams Sheet 3 Instrument Block Diagrams Sheet 3 Microwave PNA, N5244A/45A 4-Port 4-52 Keysight N5244A/45A Service Guide...
  • Page 143 N5244A/45A 4-Port Overall Block Diagram (Includes Options 400-Standard; 419-Attenuators and Bias Tees; and 423-Combiner and Source OPTION 400 Bypass Switches) DISPLAY USB BD A24 IF MULTIPLEXER RCVR A IN A16 SIGNAL PROCESSING Service Guide: N5245-90001 ADC MODULE (SPAM) Port 1...

  • Page 144: Instrument Block Diagrams Sheet 4

    Troubleshooting Instrument Block Diagrams Sheet 4 Instrument Block Diagrams Sheet 4 Microwave PNA, N5244A/45A 4-Port with Option 029 and H85 4-54 Keysight N5244A/45A Service Guide...
  • Page 145 N5244A/45A 4-Port Overall Block Diagram (Includes Options 400-Standard; 4 19-Attenuators A46 STEP and Bias Tees; 423-Combiner, and Source Bypass ATTEN Switches; H85-Delete Bias Tees; H29-Noise Figure DISPLAY USB BD A24 IF MULTIPLEXER RCVR A IN A16 SIGNAL PROCESSING Measurements to 26.5 Ghz...
  • Page 146 Troubleshooting Instrument Block Diagrams Sheet 4 4-56 Keysight N5244A/45A Service Guide...

  • Page 147: Theory Of Operation

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA-X Service Guide Theory of Operation Information in This Chapter This chapter provides a general description of the operating theory of the N524xA 2-port and 4-port PNA microwave network analyzers. — Theory of operation is explained to the assembly level only.
  • Page 148 Operation of the assemblies associated with the Option H29 page 5-36 Operation (Option H29) noise measurement group. Noise Measurement Group Operation of the assemblies associated with the Option 029 page 5-39 Operation (Option 029) noise measurement group. Keysight N5244A/45A Service Guide...

  • Page 149: Network Analyzer System Operation

    SRC 2 OUT 1 and SRC 2 OUT 2. 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 N5244A/45A Service Guide...

  • Page 150: 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 N5244A/45A Service Guide...
  • Page 151 — optional step attenuators in the source and receiver paths — optional mechanical switches 1. For PNA-X frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the Data Sheet and Technical Specifications documents. See the hyperlinks above. Keysight N5244A/45A Service Guide...
  • Page 152 “Digital Processing and Digital Control Group Operation” on Refer to page 5-30. Power Supply Group The power supply functional group provides power for the other assemblies in the instrument. “Power Supply Group Operation” on page 5-35. Refer to Keysight N5244A/45A Service Guide...

  • Page 153: Synthesized Source Group Operation

    0.826 MHz). This IF signal is sent to the A16 SPAM board for digital processing. 1. For PNA-X frequency ranges and maximum output power levels, refer to the section “Test Port Output” in the Data Sheet and Technical Specifications documents. See the hyperlinks above. Keysight N5244A/45A Service Guide...
  • Page 154 7.606 MHz. For analyzers with DSP version 5.0, the frequency value is 7.438 MHz. Since the A4, A15, and A17 13.5 GHz synthesizer boards each receive their 50 MHz input reference signal from the exact same source, frequency drift error is eliminated. Keysight N5244A/45A Service Guide...
  • Page 155 Theory of Operation Synthesized Source Group Operation Figure 5-3 Source Group Keysight N5244A/45A Service Guide...
  • Page 156 0.63561 0.63561 0.628 0.628 0.628 0.63561 to 0.63561 to 0.628 to 0.628 to 0.628 to 1.00761 1.00761 1.000 1.000 1.000 1.00761 to 1.00761 to 1.000 to 1.000 to 1.000 to 1.50761 1.50761 1.500 1.500 1.500 5-10 Keysight N5244A/45A Service Guide...
  • Page 157 8.00380 16.00761 8.000 16.000 16.000 8.00380 to 16.00761 to 8.000 to 16.000 to 16.000 to 9.00380 19.00761 9.500 19.000 19.000 9.50380 to 19.00761 to 9.500 to 9.500 to 19.000 to 10.00380 20.00761 10.000 10.000 20.000 Keysight N5244A/45A Service Guide 5-11...

  • Page 158: A4, A15, And A17 13.5 Ghz Synthesizer Boards

    The A4, A15, and A17 13.5 GHz synthesizer boards use the 50 MHz reference signal from the A14 frequency reference board to tune two VCO circuits: one that sweeps from 2 GHz to 4 GHz and one that is set to a fixed CW frequency of 3.4 GHz. 5-12 Keysight N5244A/45A Service Guide...

  • Page 159: A5 And A10 26.5 Ghz Source Boards

    A7, A8, A12, and A13 50 GHz Doubler Boards On 2-port models, the A12 and A13 50 GHz doubler boards are optional and included only with Option 224. Keysight N5244A/45A Service Guide 5-13...

  • Page 160: A25 Multiplier/Amplifier 26.5 Board (Hma26.5)

    The 10 MHz reference signal is used to phase lock a 100 MHz VCO. The output of this VCO is then divided by ten to produce the 10 MHz EXT REF OUT rear panel signal and also a 10 MHz reference signal for the A16 signal processing 5-14 Keysight N5244A/45A Service Guide...

  • Page 161: A23 Test Set Motherboard

    Connector settings can be changed using SCPI and COM commands. The settings are not accessible from the front panel. PWR I/O A DB-9 female connector. Pin assignments are listed in Table 5-3 on page 5-18. Keysight N5244A/45A Service Guide 5-15...
  • Page 162 TTL out, test set select bit 3, tied to 0 V 19–21 AD7–5 TTL I/O, address and latched data 22–23 AD0–1 TTL I/O, address and latched data TTL out, active low data strobe (1 μs min) TTL out, high = read, low = write 5-16 Keysight N5244A/45A Service Guide...
  • Page 163 TTL out, latched, indicates pass fail (programmable polarity) +5 V +5 Vdc, 100 mA max. Sweep End TTL out, active low (10 ms min) indicates sweep done Pass/Fail Write TTL out, active low pass/fail write strobe (1 ms min) Strobe Keysight N5244A/45A Service Guide 5-17...
  • Page 164 Analog input: ±10 V @ 1.22 mV typical resolution Rin > 1 M-ohm BW ≈ 1 MHz ADC conversion time < 1 us typical Power Button Open collector input Active low replicates power button key press. 5-18 Keysight N5244A/45A Service Guide...

  • Page 165: Signal Separation Group Operation

    — the A30 port 3 reference coupler and the A34 test port 3 coupler — the A31 port 4 reference coupler and the A35 test port 4 coupler — the A32 port 2 reference coupler and the A36 test port 2 coupler Keysight N5244A/45A Service Guide 5-19...

  • Page 166: A29-A32 Reference Couplers

    The coupled arm of the couplers carries the signal reflected from or transmitted through the DUT, to the receiver for measurement (through front panel jumpers), as inputs A, B, C, and D for 4-port models or inputs A and B for 5-20 Keysight N5244A/45A Service Guide...
  • Page 167 Theory of Operation Signal Separation Group Operation 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 N5244A/45A Service Guide 5-21...
  • Page 168 Theory of Operation Signal Separation Group Operation Figure 5-4 4-Port Signal Separation Group 5-22 Keysight N5244A/45A Service Guide...
  • Page 169 Theory of Operation Signal Separation Group Operation Figure 5-5 2-Port Signal Separation Group Keysight N5244A/45A Service Guide 5-23...

  • Page 170: A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees (Optional)

    These signals typically come from the analyzer’s two internal sources and are jumpered on the rear panel. 5-24 Keysight N5244A/45A Service Guide...

  • Page 171: Receiver Group Operation

    (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 models) are mixed with a synthesized LO Keysight N5244A/45A Service Guide 5-25...

  • Page 172: A24 If Multiplexer Board

    Table 5-4 on page 5-26. Table 5-4 PULSE I/O Connector Pin Assignments DB-15 Female Connector Name Description IFGateAin IF pulse gate input A (TTL) IFGateBin IF pulse gate input B (TTL) IFGateCin IF pulse gate input C (TTL) 5-26 Keysight N5244A/45A Service Guide...

  • Page 173: A16 Spam Board (Analog Description)

    The processed and formatted data is finally routed to the display, and to the “Digital general-purpose interface bus (GPIB) for remote operation. Refer to Processing and Digital Control Group Operation” on page 5-30 for more information on signal processing. Keysight N5244A/45A Service Guide 5-27...
  • Page 174 Theory of Operation Receiver Group Operation Figure 5-6 4-Port Receiver Group 5-28 Keysight N5244A/45A Service Guide...
  • Page 175 Theory of Operation Receiver Group Operation Figure 5-7 2-Port Receiver Group Keysight N5244A/45A Service Guide 5-29...

  • Page 176: Digital Processing And Digital Control Group Operation

    A2 USB Board A3 Display Assembly — — Keypad Assembly — A18 System Motherboard Data Acquisition and Processing Subgroup — A16 SPAM Board (Digital Description) — — A21 CPU Board A55 Solid State Drive — 5-30 Keysight N5244A/45A Service Guide...
  • Page 177 Theory of Operation Digital Processing and Digital Control Group Operation Figure 5-8 Digital Processing and Digital Control Group Keysight N5244A/45A Service Guide 5-31...

  • Page 178: 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 N5244A/45A Service Guide...

  • Page 179: 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 N5244A/45A Service Guide 5-33...
  • Page 180 Attachment (SATA) data storage device which is connected directly to, and physically mounted within the enclosure of, the A21 CPU board. The full operating system and firmware for the network analyzer is stored on the A55 hard disk drive. 5-34 Keysight N5244A/45A Service Guide...

  • Page 181: 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 N5244A/45A Service Guide 5-35...

  • Page 182: Noise Measurement Group Operation (Option H29)

    The noise signals are mixed with the LO synthesized signal to produce IF noise signals before being sent to the A9 Noise Receiver board. For frequencies between 10 MHz – 3GHz, 5-36 Keysight N5244A/45A Service Guide...

  • Page 183: A9 Noise Receiver Board

    In the ADC, the signals are processed and converted to digital form at the sampling rate of 40 MHz. The digitized data is then sent to the A18 system motherboard via the data bus. Keysight N5244A/45A Service Guide 5-37...
  • Page 184 Theory of Operation Noise Measurement Group Operation (Option H29) Figure 5-9 Noise Measurement Group (Option H29) 5-38 Keysight N5244A/45A Service Guide...

  • Page 185: Noise Measurement Group Operation (Option 029)

    A9 Noise Receiver board. For frequencies between 10 MHz – 6 GHz, the noise signals bypass the A59 noise downconverter, going to the A9 noise receiver board, where the signals are amplified, filtered, and mixed with the LO synthesized signal to produce the IF noise signals. Keysight N5244A/45A Service Guide 5-39...

  • Page 186: A9 Noise Receiver Board

    In the ADC, the signals are processed and converted to digital form at the sampling rate of 40 MHz. The digitized data is then sent to the A18 system motherboard via the data bus. 5-40 Keysight N5244A/45A Service Guide...
  • Page 187 Theory of Operation Noise Measurement Group Operation (Option 029) Figure 5-10 Noise Measurement Group (Option 029) Keysight N5244A/45A Service Guide 5-41...
  • Page 188 Theory of Operation Noise Measurement Group Operation (Option 029) 5-42 Keysight N5244A/45A Service Guide...

  • Page 189: 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 190: Ordering Information

    Ordering Information To order a part listed in the replaceable parts lists: — include the part number — indicate the quantity required — Contact Keysight Technologies for instructions on where to send the order. Refer to “Contacting Keysight” on page 2-7.

  • Page 191: 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 N5244A/45A Service Guide...

  • Page 192: 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 N5244A/45A Service Guide...
  • Page 193 Replaceable Parts Rebuilt-Exchange Assemblies Figure 6-1 Module Exchange Procedure Keysight N5244A/45A Service Guide...

  • Page 194: 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: Table 6-1, or — listed by reference designator in Table 6-2.
  • Page 195 Port 4 receiver step attenuator Port 2 receiver step attenuator Port 1 mechanical switch Port 3 mechanical switch Port 4 mechanical switch Port 2 mechanical switch Combiner Hard disk drive “Top Assemblies and Cables, All Options” on page 6-17 Keysight N5244A/45A Service Guide...
  • Page 196 “4-Port Configuration, Options 400/419/423/H29” on page 6-136 — “4-Port Configuration, Options 400/419/423/H85” on page 6-138 — — “4-Port Configuration, Options 400/419/423/H85/H29” on page 6-150 “4-Port Configuration, Options 400/419/423/H85/029” on page 6-152 — “Rear Panel Assembly, All Options” on page 6-165 — Hardware Keysight N5244A/45A Service Guide...
  • Page 197 — “Fuses” — Battery on page 6-181 — Analyzer Accessories on page 6-181 — — USB Accessories on page 6-181 ESD Supplies on page 6-181 — Rack Mount Kits and Handle Kits on page 6-181 — Keysight N5244A/45A Service Guide...
  • Page 198 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. 6-10 Keysight N5244A/45A Service Guide...

  • Page 199: Front Panel Assembly, Front Side, All Options

    Front (RPG) knob ➇ N5245-80003 Nameplate, N5245A N5244-80001 Nameplate, N5244A Not shown 5023-1399 Front handle a. Refer to “Rack Mount Kits and Handle Kits” on page 6-181 for part numbers of complete rack mount kits. Keysight N5244A/45A Service Guide 6-11...
  • Page 200 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options 6-12 Keysight N5244A/45A Service Guide...

  • Page 201: 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.) Keysight N5244A/45A Service Guide 6-13...
  • Page 202 In March 2013, Keysight discontinued using a display with florescent tube backlighting, and began using a display with LED backlighting. Associated parts are indicated in this table with either “Tube” or “LED.” If you replace an old part number <designated “Tube”>...
  • Page 203 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 Keysight N5244A/45A Service Guide 6-15...
  • Page 204 Replaceable Parts Replaceable Parts Listings Figure 6-5 A3 Display Assembly with New LCD Display 2090-1036 Flex Cable 6-16 Keysight N5244A/45A Service Guide...

  • Page 205: Top Assemblies And Cables, All Options

    Was N5242-60166, or N5230-60002 All prefixes 5087-7780 26.5 GHz source (1) board Was 5087-7327 5087-6780 Not used. All prefixes 5087-7349 Doubler assembly port 1 Was 5087-7318 5087-6349 All prefixes 5087-7349 Doubler assembly port 2 Was 5087-7318 5087-6349 Keysight N5244A/45A Service Guide 6-17...
  • Page 206 13.5 GHz (source 2) synthesizer board (On 2-port Was N5242-60150 models, this assembly is included only with Option 224.) 5150 and below N5240-60076 Was N5242-60166, or N5230-60002 5201 and above N5247-60002 System motherboard 5150 and below N5245-60005 6-18 Keysight N5244A/45A Service Guide...
  • Page 207 ALL of the other N5230-60002 boards. To help lower the price for customers who must replace three synthesizer boards in their PNA-X, Keysight provides kit N5242-60168 - containing three N5240-60076 boards - at a discounted price. Any spare boards may be retained for future repairs. You must also upgrade your PNA firmware to rev A09.33xx or above.
  • Page 208 Replaceable Parts Replaceable Parts Listings Figure 6-6 Top Assemblies, All Options 6-20 Keysight N5244A/45A Service Guide...
  • Page 209 A24 IF multiplexer board P803 to A16 SPAM board J6 N5242-60027 A14 frequency reference board J4 to A16 SPAM board J3 N5242-60028 A14 frequency reference board J5 to A15 13.5 GHz (LO) synthesizer board J5 Keysight N5244A/45A Service Guide 6-21...
  • Page 210 A9 noise board J5 to A59 noise downconverter assembly J2 a. SR = semirigid coaxial cable; F = flexible coaxial cable; nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-22 Keysight N5244A/45A Service Guide...
  • Page 211 Replaceable Parts Listings Figure 6-7 Top Cables, All Cables—All Options *SPAM 5 boards use W129 & W130 for 2-ports. If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-23...

  • Page 212: 2-Port Configuration, Option 200

    All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-24 Keysight N5244A/45A Service Guide...
  • Page 213 Replaceable Parts Replaceable Parts Listings Figure 6-8 Bottom Assemblies, Standard 2-Port Configuration, Option 200 Keysight N5244A/45A Service Guide 6-25...
  • Page 214 A27 mixer brick (B) to A24 IF multiplexer (P201) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-21. N5245-20048 A25 HMA26.5 to A27 mixer brick a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-26 Keysight N5244A/45A Service Guide...
  • Page 215 Bottom RF Cables, Standard 2-Port Configuration, Option 200 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-27...
  • Page 216 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-28 Keysight N5244A/45A Service Guide...
  • Page 217 Replaceable Parts Replaceable Parts Listings Figure 6-10 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Keysight N5244A/45A Service Guide 6-29...

  • Page 218: 2-Port Configuration, Option 200/219

    All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-30 Keysight N5244A/45A Service Guide...
  • Page 219 Replaceable Parts Replaceable Parts Listings Figure 6-11 Bottom Assemblies, 2-Port, Options 200/219 Keysight N5244A/45A Service Guide 6-31...
  • Page 220 A32 port 2 reference coupler to A41 port 2 source attenuator N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20030 Front-panel Port 2 CPLR THRU to A45 port 2 bias tee 6-32 Keysight N5244A/45A Service Guide...
  • Page 221 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-33...
  • Page 222 Figure 6-12 Bottom RF Cables, 2-Port, Options 200/219 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. 6-34 Keysight N5244A/45A Service Guide...
  • Page 223 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-35...
  • Page 224 Replaceable Parts Replaceable Parts Listings Figure 6-13 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219 6-36 Keysight N5244A/45A Service Guide...

  • Page 225: 2-Port Configuration, Option 200/219/H85

    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 N5244A/45A Service Guide 6-37...
  • Page 226 Replaceable Parts Replaceable Parts Listings Figure 6-14 Bottom Assemblies, 2-Port, Options 200/219/H85 6-38 Keysight N5244A/45A Service Guide...
  • Page 227 A32 port 2 reference coupler to A41 port 2 source attenuator N5245-20031 A41 port 2 source attenuator to front-panel Port 2 SOURCE OUT N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator Keysight N5244A/45A Service Guide 6-39...
  • Page 228 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) N5245-20048 A25 HMA26.5 to A27 mixer brick a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-40 Keysight N5244A/45A Service Guide...
  • Page 229 Figure 6-15 Bottom RF Cables, 2-Port, Options 200/219/H85 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-41...
  • Page 230 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-42 Keysight N5244A/45A Service Guide...
  • Page 231 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219/H85 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-43...

  • Page 232: 2-Port Configuration, Options 200/219/224

    All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-44 Keysight N5244A/45A Service Guide...
  • Page 233 Replaceable Parts Replaceable Parts Listings Figure 6-17 Bottom Assemblies, 2-Port, Options 200/219/224 Keysight N5244A/45A Service Guide 6-45...
  • Page 234 A45 port 2 bias tee to A36 port 2 coupler N5245-20030 Front-panel Port 2 CPLR THRU to A45 port 2 bias tee N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 6-46 Keysight N5244A/45A Service Guide...
  • Page 235 W127 N5245-20078 Front panel SRC 2 OUT 1 to A51 SRC2 OUT1 mechanical switch W128 N5245-20053 Front panel SRC 2 OUT 2 to W15 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-47...
  • Page 236 Figure 6-18 Bottom RF Cables, 2-Port, Options 200/219/224 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. 6-48 Keysight N5244A/45A Service Guide...
  • Page 237 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness Keysight N5244A/45A Service Guide 6-49...
  • Page 238 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-50 Keysight N5244A/45A Service Guide...
  • Page 239 Replaceable Parts Replaceable Parts Listings Figure 6-19 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219/224 Keysight N5244A/45A Service Guide 6-51...

  • Page 240: 2-Port Configuration, Options 200/219/224/029

    Port 2 mechanical switch 11667-60021 Combiner Was N5532-60002 N1811-60033 Port 1 noise bypass switch Port 2 noise bypass switch 5087-7344 Noise downconverter 5087-7345 Tuner ➀ N5240-60058 Front panel LED board Was N5240-60051 ➁ 5063-1700 Bulkhead connectors 6-52 Keysight N5244A/45A Service Guide...
  • Page 241 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 N5244A/45A Service Guide 6-53...
  • Page 242 Replaceable Parts Replaceable Parts Listings Figure 6-20 Bottom Assemblies, 2-Port, Options 200/219/224/029 6-54 Keysight N5244A/45A Service Guide...
  • Page 243 N5245-20047 A45 port 2 bias tee to A36 port 2 coupler N5245-20047 A45 port 2 bias tee to A36 port 2 coupler N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator Keysight N5244A/45A Service Guide 6-55...
  • Page 244 A57 port 2 noise bypass switch to A45 port 2 bias tee W168 N5245-20146 A59 noise downconverter to A57 port 2 noise bypass switch W169 N5245-20147 A59 noise downconverter to A57 port 2 noise bypass switch W170 N5245-20150 A26 splitter to A59 noise downconverter 6-56 Keysight N5244A/45A Service Guide...
  • Page 245 Replaceable Parts Replaceable Parts Listings Reference Part Number Description Type Designator W171-173, Refer to “Top Cables, All Cables—All Options” on page 6-21. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-57...
  • Page 246 Figure 6-21 Bottom RF Cables, 2-Port, Options 200/219/224/029 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. 6-58 Keysight N5244A/45A Service Guide...
  • Page 247 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5244A/45A Service Guide 6-59...
  • Page 248 A23 test set motherboard J546 to A41 port 2 source attenuator N5245-60026 A23 test set motherboard J208 to A49 port 2 receiver attenuator Was 8121-0982, N5242-60007 N5245-60018 A59 noise downconverter J1 port 1 to A23 test set motherboard J550 6-60 Keysight N5244A/45A Service Guide...
  • Page 249 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-61...
  • Page 250 Replaceable Parts Replaceable Parts Listings Figure 6-22 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219/224/029 6-62 Keysight N5244A/45A Service Guide...

  • Page 251: 2-Port Configuration, Options 200/219/224/H85

    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 N5244A/45A Service Guide 6-63...
  • Page 252 Replaceable Parts Replaceable Parts Listings Figure 6-23 Bottom Assemblies, 2-Port, Options 200/219/224/H85 6-64 Keysight N5244A/45A Service Guide...
  • Page 253 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator Keysight N5244A/45A Service Guide 6-65...
  • Page 254 W127 N5245-20078 Front panel SRC 2 OUT 1 to A51 SRC2 OUT1 mechanical switch W128 N5245-20053 Front panel SRC 2 OUT 2 to W15 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-66 Keysight N5244A/45A Service Guide...
  • Page 255 Figure 6-24 Bottom RF Cables, 2-Port, Options 200/219/224/H85 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-67...
  • Page 256 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-68 Keysight N5244A/45A Service Guide...
  • Page 257 Replaceable Parts Replaceable Parts Listings Figure 6-25 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219/224/H85 Keysight N5244A/45A Service Guide 6-69...

  • Page 258: 2-Port Configuration, Options 200/219/224/H85/029

    Noise downconverter (receiver) 5087-7345 Tuner ➀ N5240-60058 Front panel LED board Was N5240-60051 ➁ 5063-1700 Bulkhead connectors a. Part numbers in italic typeface are for rebuilt exchange assemblies. Refer to “Rebuilt-Exchange Assemblies” on page 6-4. 6-70 Keysight N5244A/45A Service Guide...
  • Page 259 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5244A/45A Service Guide 6-71...
  • Page 260 Replaceable Parts Replaceable Parts Listings Figure 6-26 Bottom Assemblies, 2-Port, Options 200/219/224/H85/029 6-72 Keysight N5244A/45A Service Guide...
  • Page 261 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator Keysight N5244A/45A Service Guide 6-73...
  • Page 262 A59 noise downconverter to A57 port 2 noise bypass switch W170 N5245-20150 A26 splitter to A59 noise downconverter W171-173, Refer to “Top Cables, All Cables—All Options” on page 6-21. a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-74 Keysight N5244A/45A Service Guide...
  • Page 263 Figure 6-27 Bottom RF Cables, 2-Port, Options 200/219/224/H85/029 *SPAM 5 boards use W129 & W130 for 2-ports (not shown). If your instrument has a SPAM 4 board, W70 & W72 apply to 2-Port and 4-Port models. Keysight N5244A/45A Service Guide 6-75...
  • Page 264 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. 6-76 Keysight N5244A/45A Service Guide...
  • Page 265 A23 test set motherboard J208 to A49 port 2 receiver attenuator Was 8121-0982, or N5242-600077 N5245-60018 A59 noise downconverter J1 port 1 to A23 test set motherboard J550 N5230-60014 A23 test set motherboard J209 to A25 HMA26.5 J1 Was N5242-60011 Keysight N5244A/45A Service Guide 6-77...
  • Page 266 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-78 Keysight N5244A/45A Service Guide...
  • Page 267 Replaceable Parts Replaceable Parts Listings Figure 6-28 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Options 200/219/224/H85/029 Keysight N5244A/45A Service Guide 6-79...

  • Page 268: 4-Port Configuration, Option 400

    All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-80 Keysight N5244A/45A Service Guide...
  • Page 269 Replaceable Parts Replaceable Parts Listings Figure 6-29 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Keysight N5244A/45A Service Guide 6-81...
  • Page 270 Port 2 RCVR B IN to A27 mixer brick (B) N5245-20006 A37 reference mixer switch to front-panel REF 1 SOURCE OUT N5245-20007 REF 1 RCVR R1 IN to A37 reference mixer switch N5245-20009 A37 reference mixer switch to A27 mixer brick (R1) 6-82 Keysight N5244A/45A Service Guide...
  • Page 271 A28 mixer brick (R3) to A24 IF multiplexer (P413) N5242-60023 A28 mixer brick (C) to A24 IF multiplexer (P601) W69-73 Refer to “Top Cables, All Cables—All Options” on page 6-21. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-83...
  • Page 272 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. 6-84 Keysight N5244A/45A Service Guide...
  • Page 273 Replaceable Parts Replaceable Parts Listings Figure 6-30 Bottom RF Cables, Standard 4-Port Configuration, Option 400 Keysight N5244A/45A Service Guide 6-85...
  • Page 274 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-86 Keysight N5244A/45A Service Guide...
  • Page 275 Replaceable Parts Replaceable Parts Listings Figure 6-31 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 Keysight N5244A/45A Service Guide 6-87...

  • Page 276: 4-Port Configuration, Options 400/419

    Test port 2 bias tee (includes wire harness) 33325-60017 Port 1 receiver attenuator Port 3 receiver attenuator Was 33325-60011 Port 4 receiver attenuator Port 2 receiver attenuator 08490-60010 3 dB pad (For A28 mixer brick R4) 6-88 Keysight N5244A/45A Service Guide...
  • Page 277 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 N5244A/45A Service Guide 6-89...
  • Page 278 Replaceable Parts Replaceable Parts Listings Figure 6-32 Bottom Assemblies, 4-Port, Options 400/419 6-90 Keysight N5244A/45A Service Guide...
  • Page 279 N5245-20076 Front-panel Port 1 CPLR THRU to A42 port 1 bias tee N5245-20085 A33 port 1 coupler to A42 port 1 bias tee N5245-20029 A32 port 2 reference coupler to A41 port 2 source attenuator Keysight N5244A/45A Service Guide 6-91...
  • Page 280 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-92 Keysight N5244A/45A Service Guide...
  • Page 281 Replaceable Parts Replaceable Parts Listings Figure 6-33 Bottom RF Cables, 4-Port, Options 400/419 (Ports 1 and 2) Keysight N5244A/45A Service Guide 6-93...
  • Page 282 N5245-20074 Port 4 RCVR D IN to A48 port 4 receiver attenuator W102 N5245-20075 A48 port 4 receiver attenuator to A28 mixer brick (D) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-94 Keysight N5244A/45A Service Guide...
  • Page 283 Replaceable Parts Replaceable Parts Listings Figure 6-34 Bottom RF Cables, 4-Port, Options 400/419 (Ports 3 and 4) Keysight N5244A/45A Service Guide 6-95...
  • Page 284 A23 test set motherboard J552 to A28 mixer brick (2) J52 Was N5245-60008 N5230-60014 A23 test set motherboard J209 to A25 HMA26.5 J1 Was N5242-60011 100R N5242-60004 A18 system motherboard J1 to A23 test set motherboard J1 to A24 IF multiplexer board J1 6-96 Keysight N5244A/45A Service Guide...
  • Page 285 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-97...
  • Page 286 Replaceable Parts Replaceable Parts Listings Figure 6-35 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Options 400/419 6-98 Keysight N5244A/45A Service Guide...

  • Page 287: 4-Port Configuration, Options 400/419/H85

    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 N5244A/45A Service Guide 6-99...
  • Page 288 Replaceable Parts Replaceable Parts Listings Figure 6-36 Bottom Assemblies, 4-Port, Options 400/419/H85 6-100 Keysight N5244A/45A Service Guide...
  • Page 289 A29 port 1 reference coupler to A38 port 1 source attenuator N5245-20077 A38 port 1 source attenuator to front-panel Port 1 SOURCE OUT N5245-20029 A32 port 2 reference coupler to A41 port 2 source attenuator Keysight N5244A/45A Service Guide 6-101...
  • Page 290 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-102 Keysight N5244A/45A Service Guide...
  • Page 291 Replaceable Parts Replaceable Parts Listings Figure 6-37 Bottom RF Cables, 4-Port, Options 400/419/H85 (Ports 1 and 2) Keysight N5244A/45A Service Guide 6-103...
  • Page 292 N5245-20074 Port 4 RCVR D IN to A48 port 4 receiver attenuator W102 N5245-20075 A48 port 4 receiver attenuator to A28 mixer brick (D) a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-104 Keysight N5244A/45A Service Guide...
  • Page 293 Replaceable Parts Replaceable Parts Listings Figure 6-38 Bottom RF Cables, 4-Port, Options 400/419/H85 (Ports 3 and 4) Keysight N5244A/45A Service Guide 6-105...
  • Page 294 A18 system motherboard J13 to A23 test set motherboard J545 8121-0834 Rear-panel HANDLER I/O to A23 test set motherboard J400 a. nR = n wires in a ribbon (flat) cable; nW = n wires in a wire harness 6-106 Keysight N5244A/45A Service Guide...
  • Page 295 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-107...
  • Page 296 Replaceable Parts Replaceable Parts Listings Figure 6-39 Bottom Ribbon Cables & Wire Harnesses, 4-Port, Options 400/419/H85 6-108 Keysight N5244A/45A Service Guide...

  • Page 297: 4-Port Configuration, Options 400/419/423

    Port 1 receiver attenuator Port 3 receiver attenuator Was 33325-60011 Port 4 receiver attenuator Port 2 receiver attenuator N1811-60031 Port 1 mechanical switch Port 3 mechanical switch Was N1811-60009 Port 4 mechanical switch Port 2 mechanical switch Keysight N5244A/45A Service Guide 6-109...
  • Page 298 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-110 Keysight N5244A/45A Service Guide...
  • Page 299 Replaceable Parts Replaceable Parts Listings Figure 6-40 Bottom Assemblies, 4-Port, Options 400/419/423 Keysight N5244A/45A Service Guide 6-111...
  • Page 300 N5245-20030 Port 2 CPLR THRU to A45 port 2 bias tee N5245-20087 A45 port 2 bias tee to A36 port 2 coupler N5245-20054 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator 6-112 Keysight N5244A/45A Service Guide...
  • Page 301 A53 port 2 mechanical switch to PORT 2 SW SRC OUT (J2) W122 N5245-20072 A53 port 2 mechanical switch to PORT 2 TSET IN (J1) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-113...
  • Page 302 Replaceable Parts Replaceable Parts Listings Figure 6-41 Bottom RF Cables, 4-Port, Options 400/419/423 (Ports 1 and 2) 6-114 Keysight N5244A/45A Service Guide...
  • Page 303 A51 port 3 mechanical switch to A30 port 3 reference coupler W113 N5245-20069 A51 port 3 mechanical switch to PORT 3 SW SRC OUT (J8) W114 N5245-20070 Rear-panel PORT 3 SW TSET IN (J7) to A51 port 3 mechanical switch Keysight N5244A/45A Service Guide 6-115...
  • Page 304 A52 port 4 mechanical switch to PORT 4 SW SRC OUT (J4) W118 N5245-20091 A52 port 4 mechanical switch to PORT 4 SW TSET (J3) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-116 Keysight N5244A/45A Service Guide...
  • Page 305 Replaceable Parts Replaceable Parts Listings Figure 6-42 Bottom RF Cables, 4-Port, Options 400/419/423 (Ports 3 and 4) Keysight N5244A/45A Service Guide 6-117...
  • Page 306 “4-Port Configuration, Options 400/419/423” on page 6-109. N5245-60006 A23 test set motherboard J548 to A40 port 4 source attenuator N5245-60026 A23 test set motherboard J207 to A48 port 4 receiver attenuator Was 8121-0982, or N5242-60007 6-118 Keysight N5244A/45A Service Guide...
  • Page 307 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-119...
  • Page 308 Replaceable Parts Replaceable Parts Listings Figure 6-43 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Options 400/419/423 6-120 Keysight N5244A/45A Service Guide...

  • Page 309: 4-Port Configuration, Options 400/419/423/029

    Test port 4 bias tee (includes wire harness) Test port 2 bias tee (includes wire harness) 33325-60017 Port 1 receiver attenuator Port 3 receiver attenuator Was 33325-60011 Port 4 receiver attenuator Port 2 receiver attenuator Keysight N5244A/45A Service Guide 6-121...
  • Page 310 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. 6-122 Keysight N5244A/45A Service Guide...
  • Page 311 Replaceable Parts Replaceable Parts Listings Keysight N5244A/45A Service Guide 6-123...
  • Page 312 Replaceable Parts Replaceable Parts Listings Figure 6-44 Bottom Assemblies, 4-Port, Options 400/419/423/029 6-124 Keysight N5244A/45A Service Guide...
  • Page 313 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5244A/45A Service Guide 6-125...
  • Page 314 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) 6-126 Keysight N5244A/45A Service Guide...
  • Page 315 A59 noise downconverter to A57 port 2 noise bypass switch W174 N5245-20143 A28 mixer brick to A59 noise downconverter W171-173, Refer to “Top Cables, All Cables—All Options” on page 6-21. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-127...
  • Page 316 Replaceable Parts Replaceable Parts Listings Figure 6-45 Bottom RF Cables, 4-Port, Options 400/419/423/029 (Ports 1 and 2) 6-128 Keysight N5244A/45A Service Guide...
  • Page 317 A51 port 3 mechanical switch to PORT 3 SW SRC OUT (J8) W114 N5245-20070 Rear-panel PORT 3 SW TSET IN (J7) to A51 port 3 mechanical switch W115 N5245-20060 A52 port 4 mechanical switch to W15 Keysight N5244A/45A Service Guide 6-129...
  • Page 318 A52 port 4 mechanical switch to PORT 4 SW SRC OUT (J4) W118 N5245-20091 A52 port 4 mechanical switch to PORT 4 SW TSET (J3) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-130 Keysight N5244A/45A Service Guide...
  • Page 319 Replaceable Parts Replaceable Parts Listings Figure 6-46 Bottom RF Cables, 4-Port, Options 400/419/423/029 (Ports 3 and 4) Keysight N5244A/45A Service Guide 6-131...
  • Page 320 A23 test set motherboard J548 to A40 port 4 source attenuator N5245-60026 A23 test set motherboard J207 to A48 port 4 receiver attenuator Was 8121-0982, or N5242-60007 N5242-60007 A23 test set motherboard J208 to A49 port 2 receiver attenuator 6-132 Keysight N5244A/45A Service Guide...
  • Page 321 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-133...
  • Page 322 Replaceable Parts Replaceable Parts Listings Figure 6-47 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Options 400/419/423/029 6-134 Keysight N5244A/45A Service Guide...
  • Page 323 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5244A/45A Service Guide 6-135...

  • Page 324: 4-Port Configuration, Options 400/419/423/H29

    Ribbon cable, A59 noise downconverter to A23 test set motherboard J550 a. Part numbers in italic typeface are for rebuilt exchange assemblies. Refer to “Rebuilt-Exchange Assemblies” on page 6-4. 1. Option H29 will not be available for purchase after May 1, 2013. 6-136 Keysight N5244A/45A Service Guide...
  • Page 325 Bottom Assemblies and Cables, 4-Port, Options 400/419/423/H29 This illustration shows only those parts that are unique to Option H29. For information on other “4-Port Configuration, parts included in option combination 400/419/423/H29, refer to Options 400/419/423” on page 6-109. Keysight N5244A/45A Service Guide 6-137...

  • Page 326: 4-Port Configuration, Options 400/419/423/H85

    Port 3 receiver attenuator Was 33325-60011 Port 4 receiver attenuator Port 2 receiver attenuator N1811-60031 Port 1 mechanical switch Port 3 mechanical switch Was N1811-60009 Port 4 mechanical switch Port 2 mechanical switch 11667-60021 Combiner Was N5532-60002 6-138 Keysight N5244A/45A Service Guide...
  • Page 327 All new units built after August 2009, no longer use the N5242-60031 cable that was attached to connector P1001 and Source 2. As a result of this change, the IF multiplexer boards have had their P1001 connectors removed. If your instrument contains a N5242-60031 cable, remove it from your instrument. Keysight N5244A/45A Service Guide 6-139...
  • Page 328 Replaceable Parts Replaceable Parts Listings Figure 6-49 Bottom Assemblies, 4-Port, Options 400/419/423/H85 6-140 Keysight N5244A/45A Service Guide...
  • Page 329 Front-panel Port 1 RCVR A IN to A46 port 1 receiver attenuator N5245-20056 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator Keysight N5244A/45A Service Guide 6-141...
  • Page 330 A53 port 2 mechanical switch to PORT 2 SW SRC OUT (J2) W122 N5245-20072 A53 port 2 mechanical switch to PORT 2 TSET IN (J1) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-142 Keysight N5244A/45A Service Guide...
  • Page 331 Replaceable Parts Replaceable Parts Listings Figure 6-50 Bottom RF Cables, 4-Port, Options 400/419/423/H85 (Ports 1 and 2) Keysight N5244A/45A Service Guide 6-143...
  • Page 332 Rear-panel PORT 3 SW TSET IN (J7) to A51 port 3 mechanical switch W115 N5245-20060 A52 port 4 mechanical switch to W15 W116 N5245-20061 A52 port 4 mechanical switch to A31 port 4 reference coupler 6-144 Keysight N5244A/45A Service Guide...
  • Page 333 A52 port 4 mechanical switch to PORT 4 SW SRC OUT (J4) W118 N5245-20091 A52 port 4 mechanical switch to PORT 4 SW TSET (J3) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-145...
  • Page 334 Replaceable Parts Replaceable Parts Listings Figure 6-51 Bottom RF Cables, 4-Port, Options 400/419/423/H85 (Ports 3 and 4) 6-146 Keysight N5244A/45A Service Guide...
  • Page 335 A23 test set motherboard J207 to A48 port 4 receiver attenuator Was 8121-0982, or N5242-60007 N5245-60026 A23 test set motherboard J208 to A49 port 2 receiver attenuator Was 8121-0982, or N5242-60007 N5245-60006 A23 test set motherboard J546 to A41 port 2 source attenuator Keysight N5244A/45A Service Guide 6-147...
  • Page 336 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. 6-148 Keysight N5244A/45A Service Guide...
  • Page 337 Replaceable Parts Replaceable Parts Listings Figure 6-52 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Options 400/419/423/H85 Keysight N5244A/45A Service Guide 6-149...

  • Page 338: 4-Port Configuration, Options 400/419/423/H85/H29

    Ribbon cable, A59 noise downconverter to A23 test set motherboard J550 a. Part numbers in italic typeface are for rebuilt exchange assemblies. Refer to “Rebuilt-Exchange Assemblies” on page 6-4. 1. Option H29 will not be available for purchase after May 1, 2013. 6-150 Keysight N5244A/45A Service Guide...
  • Page 339 Replaceable Parts Replaceable Parts Listings Figure 6-53 Bottom Assemblies and Cables, 4-Port, Options 400/419/423/H85/H29 Keysight N5244A/45A Service Guide 6-151...

  • Page 340: 4-Port Configuration, Options 400/419/423/H85/029

    Test port 3 source attenuator Was 33325-60012 Test port 4 source attenuator Test port 2 source attenuator 33325-60017 Port 1 receiver attenuator Port 3 receiver attenuator Was 33325-60011 Port 4 receiver attenuator Port 2 receiver attenuator 6-152 Keysight N5244A/45A Service Guide...
  • Page 341 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 N5244A/45A Service Guide 6-153...
  • Page 342 Replaceable Parts Replaceable Parts Listings Figure 6-54 Bottom Assemblies, 4-Port, Options 400/419/423/H85/029 6-154 Keysight N5244A/45A Service Guide...
  • Page 343 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5244A/45A Service Guide 6-155...
  • Page 344 A46 port 1 receiver attenuator to A27 mixer brick (A) W103 N5245-20055 Port 2 RCVR B IN to A49 port 2 receiver attenuator W104 N5245-20057 A49 port 2 receiver attenuator to A27 mixer brick (B) W105 N5245-20064 A50 port 1 mechanical switch to W11 6-156 Keysight N5244A/45A Service Guide...
  • Page 345 “Top Cables, All Cables—All Options” on page 6-21. W174 N5245-20143 A28 mixer brick to A59 noise downconverter Refer to “Top Cables, All Cables—All Options” on page 6-21. a. SR = semirigid coaxial cable; F = flexible coaxial cable Keysight N5244A/45A Service Guide 6-157...
  • Page 346 Replaceable Parts Replaceable Parts Listings Figure 6-55 Bottom RF Cables, 4-Port, Options 400/419/423/H85/029 (Ports 1 and 2) 6-158 Keysight N5244A/45A Service Guide...
  • Page 347 Rear-panel PORT 3 SW TSET IN (J7) to A51 port 3 mechanical switch W115 N5245-20060 A52 port 4 mechanical switch to W15 W116 N5245-20061 A52 port 4 mechanical switch to A31 port 4 reference coupler Keysight N5244A/45A Service Guide 6-159...
  • Page 348 A52 port 4 mechanical switch to PORT 4 SW SRC OUT (J4) W118 N5245-20091 A52 port 4 mechanical switch to PORT 4 SW TSET (J3) W123 N5245-20155 Rear panel jumper Was N5245-20104 a. SR = semirigid coaxial cable; F = flexible coaxial cable 6-160 Keysight N5244A/45A Service Guide...
  • Page 349 Replaceable Parts Replaceable Parts Listings Figure 6-56 Bottom RF Cables, 4-Port, Options 400/419/423/H85/029 (Ports 3 and 4) Keysight N5244A/45A Service Guide 6-161...
  • Page 350 A59 noise downconverter J1 port 1 to A23 test set motherboard J550 N5245-60006 A23 test set motherboard J546 to A41 port 2 source attenuator P/O A52 port 4 mechanical switch (to A23 test set motherboard J103). 6-162 Keysight N5244A/45A Service Guide...
  • Page 351 You must also replace the old test set front plate with a current version (2-port N5224-00004, or 4-port N5224-00005). While replacing the test set front plate, both LED boards must be removed and reinstalled after being rotated180 degrees. Keysight N5244A/45A Service Guide 6-163...
  • Page 352 Replaceable Parts Replaceable Parts Listings Figure 6-57 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Options 400/419/423/H85/029 6-164 Keysight N5244A/45A Service Guide...

  • Page 353: Rear Panel Assembly, All Options

    PWR I/O cable assembly Connector-D-subminiature filter adapter 1253-8234 Ferrite for ribbon cable N5242-60005 9170-2235 1250-4261 Termination, 50 ohm load Was: 1810-0118 8121-0834 HANDLER I/O cable assembly Ferrite for ribbon cable 8121-0834 9170-2236 2190-0068 Lock washer 2950-0054 Hex nut Keysight N5244A/45A Service Guide 6-165...
  • Page 354 Termination, 2.4 mm 50 GHz load (1 used for Option 224 and 423) a. This part number is no longer required on s/n’s 5541, 5542, 5544, 5545, 5547, 5549 and newer. But, is included for your ref- erence. Figure 6-58 Rear Panel Assembly, All Options 6-166 Keysight N5244A/45A Service Guide...

  • Page 355: Fan Assemblies, All Options

    Machine screw, M3.0 x 8, pan head (To attach: 2-fan assy to chassis, 3-fan assy to chassis) ⑥ Chassis (Refer to “Internal Hardware and Miscellaneous Parts, All Options” on page 6-176.) Not shown E4440-00021 EMI shield for fan, adhesive Keysight N5244A/45A Service Guide 6-167...
  • Page 356 Replaceable Parts Replaceable Parts Listings Figure 6-59 Fan Assemblies, Side View, All Options 6-168 Keysight N5244A/45A Service Guide...

  • Page 357: Top Hardware And Miscellaneous Parts, All Options

    Machine screw, M3.0 x 8, pan head (To attach: power supply bracket to inner panels, A18 system motherboard to the chassis.) ⑤ 0400-0353 Midplane board grommets ⑥ 0515-0380 Machine screw, M4.0 x 10, pan head (To attach all doubler and all source boards to inner panels.) Keysight N5244A/45A Service Guide 6-169...
  • Page 358 Replaceable Parts Replaceable Parts Listings Figure 6-60 Top Hardware and Miscellaneous Parts, Top View, All Options 6-170 Keysight N5244A/45A Service Guide...

  • Page 359: Bottom Hardware And Miscellaneous Parts

    8 to attach reference coupler brackets to test set deck), All prefixes N5235-00018 Bracket, ribbon cable clamp All prefixes N5245-20125 Gap pad (Between each mixer brick and its shield.) All prefixes N5245-00023 Mixer brick shield All prefixes N5245-00020 Bracket (For A 54 combiner.) Keysight N5244A/45A Service Guide 6-171...
  • Page 360 Stabilizer bracket (Between A23 test set motherboard and A24 IF mux board.) All prefixes N5242-00029 Protective guard for front panel jumpers All prefixes N5242-00030 Protective guard for front panel jumpers (4-port models only.) All prefixes 5022-1087 Test port coupler dress nut (One for each coupler.) 6-172 Keysight N5244A/45A Service Guide...
  • Page 361 If you are replacing older test set front plates with current test set front plates (2-port N5224-00004, and 4-port N5224-00005), both LED boards must be removed and reinstalled after being rotated 180 degrees. Also, older LED board wire harnesses must both be replaced with current wire harnesses (N5225-60001). Keysight N5244A/45A Service Guide 6-173...
  • Page 362 Replaceable Parts Replaceable Parts Listings Figure 6-61 Bottom Hardware and Miscellaneous Parts 6-174 Keysight N5244A/45A Service Guide...
  • Page 363 Replaceable Parts Replaceable Parts Listings This page intentionally left blank. Keysight N5244A/45A Service Guide 6-175...

  • Page 364: Internal Hardware And Miscellaneous Parts, All Options

    All prefixes N5247-00013 Front bracket Was N5245-00007 ➆ All prefixes N5242-40002 PC board guides a. In this table, the two letters that indicate the PNA manufacturing location have been removed from each serial number prefix. 6-176 Keysight N5244A/45A Service Guide...
  • Page 365 Replaceable Parts Replaceable Parts Listings Figure 6-62 Internal Hardware and Miscellaneous Parts, All Options Keysight N5244A/45A Service Guide 6-177...

  • Page 366: External Hardware And Miscellaneous Parts, All Options

    All prefixes N5245-40002 Rear impact cover shown All prefixes 5023-1399 Front handle shown a. In this table, the two letters that indicate the PNA manufacturing location have been removed from each serial number prefix. 6-178 Keysight N5244A/45A Service Guide...
  • Page 367 Replaceable Parts Replaceable Parts Listings Figure 6-63 External Hardware and Miscellaneous Parts, All Options Keysight N5244A/45A Service Guide 6-179...

  • Page 368: Miscellaneous Part Numbers

    Installation and Quick Start Guide (for all PNA series analyzers) (Cannot be ordered. Part number E8356-90001 is for reference only. Must be printed from the Keysight Web site.) Service Guide. (Not available in printed form. Part number is for reference only. Must be printed N5245-90001 from the Keysight Web site.)
  • Page 369 Rack mount kit (rack mount flanges and hardware) 1CM042A Was 5063-9217 Rack mount rail set E3663AC Rack mount kit for analyzers with handles (Option 1CP) N5231AU-1CP or N5232AU-1CP or N5239AU-1CP Option 1CP includes the following separately orderable items: Keysight N5244A/45A Service Guide 6-181...
  • Page 370 Available” on page 2-3 for information on upgrades that are available for the “Analyzer Options, N5244A and N5245A analyzers. Refer to the section, Accessories, and Upgrades Available” on page 2-3, for a complete description of each option included in the upgrades.

  • Page 371: Repair And Replacement Procedures

    2-Port and 4-Port PNA-X Service Guide Repair and Replacement Procedures Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Keysight Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content...

  • Page 372: Personal Safety Warnings

    The front panel switch is only a standby switch and is not a LINE switch (disconnecting device). Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to manufacturer’s instructions. Keysight N5244A/45A Service Guide...

  • Page 373: Electrostatic Discharge (Esd) Protection

    To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-7, for all of the procedures in this chapter. Keysight N5244A/45A Service Guide...

  • Page 374: Removal And Replacement Procedures

    Port 3 reference coupler Port 4 reference coupler Port 2 reference coupler Port 1 test port coupler page 7-44 Port 3 test port coupler Port 4 test port coupler Port 2 test port coupler Reference mixer switch page 7-46 Keysight N5244A/45A Service Guide...
  • Page 375 Option 029: page 7-65 Port 2 noise bypass switch (Option 029) Noise downconverter (Option 029) Tuner (Option 029) page 7-68 Rear panel page 7-71 Front panel LED boards page 7-73 Fans page 7-75 Lithium battery page 7-77 Keysight N5244A/45A Service Guide...
  • Page 376 Repair and Replacement Procedures Removal and Replacement Procedures This page intentionally left blank. Keysight N5244A/45A Service Guide...

  • Page 377: Removing The Covers

    Ribbon cables and wires must never be positioned on top of hardware. 3. Reverse the order of the removal procedures above. Keysight N5244A/45A Service Guide...
  • Page 378 Repair and Replacement Procedures Removing the Covers Figure 7-1 Outer and Inner Cover Removal Keysight N5244A/45A Service Guide...

  • Page 379: Removing And Replacing The Front Panel Assembly

    When reconnecting the front-panel jumpers, torque the connectors to 10 in-lb. 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Keysight N5244A/45A Service Guide...
  • Page 380 Repair and Replacement Procedures Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal 7-10 Keysight N5244A/45A Service Guide...

  • Page 381: Removing And Replacing The A1-A3 And Other Front Panel Subassemblies

    Removing the Inverter Board ③ ⑧ 1. Disconnect the inverter board cable (item ) and the LCD cable (item from the inverter board. ⑨ 2. Remove two screws (item ) and remove the inverter board. Keysight N5244A/45A Service Guide 7-11...
  • Page 382 3. The power button keypad can now be removed from the power switch board by gently pulling each of the rubber tabs through the PC board. Figure 7-3 Front Panel Subassemblies Removal Removing the A3 Display Assembly and the Touchscreen 7-12 Keysight N5244A/45A Service Guide...
  • Page 383 To replace the touch screen, note the orientation of the rubber boot on the old touch screen and then remove it and install it on the new one in the same orientation. Figure 7-4 A3 Display Assembly and Touch Screen Removal-1 Keysight N5244A/45A Service Guide 7-13...
  • Page 384 A3 Display Assembly and Touch Screen Removal-2 Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-14 Keysight N5244A/45A Service Guide...

  • Page 385: Removing And Replacing The A4-A17 Boards (For Analyzers With Serial Numbers Prefixed My/Sg/Us5150 And Below)

    4. A4, A7, A8, A9, A12, A13, A14, A15, A16, and A17 boards: a. Remove all cables connected to the top of the board to be removed. Note the location of each cable for reinstallation. Keysight N5244A/45A Service Guide 7-15...
  • Page 386 RoHS compliant N5240-60076 board, you must replace ALL of the other N5230-60002 boards. To help lower the price for customers who must replace three synthesizer boards in their PNA-X, Keysight provides kit N5242-60168 - containing three N5240-60076 boards - at a discounted price.
  • Page 387 Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5150 and below) Figure 7-6 A4, A5, A7, A8, A9, A10, A12, A13, A14, A15, A16, and A17 Boards Removal Keysight N5244A/45A Service Guide 7-17...
  • Page 388 4. A4, A7, A8, A9, A12, A13, A14, A15, A16, and A17 boards: a. Remove all cables connected to the top of the board to be removed. Note the location of each cable for reinstallation. 7-18 Keysight N5244A/45A Service Guide...
  • Page 389 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 7-79 Keysight N5244A/45A Service Guide 7-19...
  • Page 390 Repair and Replacement Procedures Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers prefixed MY/SG/US5201 and above) Figure 7-7 A4, A5, A7, A8, A9, A10, A12, A13, A14, A15, A16, and A17 Boards Removal 7-20 Keysight N5244A/45A Service Guide...

  • Page 391: Removing And Replacing The A18 System Motherboard

    ) from each side that secure the midplane bracket to the chassis inner panels. Lift the midplane bracket out of the analyzer. ➃ 17. Remove the three screws (item ) that secure the front bracket to the chassis left inner panel. Keysight N5244A/45A Service Guide 7-21...
  • Page 392 20.Lift the A18 system motherboard out of the analyzer. Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-22 Keysight N5244A/45A Service Guide...
  • Page 393 Repair and Replacement Procedures Removing and Replacing the A18 System Motherboard Figure 7-8 A18 System Motherboard Removal Keysight N5244A/45A Service Guide 7-23...

  • Page 394: 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 7-79. 7-24 Keysight N5244A/45A Service Guide...
  • Page 395 Repair and Replacement Procedures Removing and Replacing the A19 Midplane Board Figure 7-9 A19 Midplane Board Removal Keysight N5244A/45A Service Guide 7-25...

  • Page 396: 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 7-79. 7-26 Keysight N5244A/45A Service Guide...
  • Page 397 Repair and Replacement Procedures Removing and Replacing the A20 Power Supply Assembly Figure 7-10 A20 Power Supply Assembly Removal Keysight N5244A/45A Service Guide 7-27...

  • Page 398: Removing And Replacing The A21 Cpu Board Assembly

    (SSD)” on page 7-55. 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 7-79. 7-28 Keysight N5244A/45A Service Guide...
  • Page 399 Repair and Replacement Procedures Removing and Replacing the A21 CPU Board Assembly Figure 7-11 A21 CPU Board Assembly Removal Keysight N5244A/45A Service Guide 7-29...

  • Page 400: 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 7-79. 7-30 Keysight N5244A/45A Service Guide...
  • Page 401 Repair and Replacement Procedures Removing and Replacing the A22 GPIB Board Figure 7-12 A22 GPIB Board Removal Keysight N5244A/45A Service Guide 7-31...

  • Page 402: Removing And Replacing The A23 Test Set Motherboard

    Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-32 Keysight N5244A/45A Service Guide...
  • Page 403 Repair and Replacement Procedures Removing and Replacing the A23 Test Set Motherboard Figure 7-13 A23 Test Set Motherboard Removal Keysight N5244A/45A Service Guide 7-33...

  • Page 404: Removing And Replacing The A24 If Multiplexer Board

    Torque rear panel RF connector nuts to 21 in-lbs and PULSE I/O connector screws to 6 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-34 Keysight N5244A/45A Service Guide...
  • Page 405 Repair and Replacement Procedures Removing and Replacing the A24 IF Multiplexer Board Figure 7-14 A24 IF Multiplexer Board Removal Keysight N5244A/45A Service Guide 7-35...

  • Page 406: Removing And Replacing The A25 Hma26.5

    1. Reverse the order of the removal procedure. Torque all RF cable connectors to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-36 Keysight N5244A/45A Service Guide...
  • Page 407 Repair and Replacement Procedures Removing and Replacing the A25 HMA26.5 Figure 7-15 A25 HMA26.5 Removal Keysight N5244A/45A Service Guide 7-37...

  • Page 408: Removing And Replacing The A26 Splitter

    1. Reverse the order of the removal procedure. Torque all RF cable connections to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-38 Keysight N5244A/45A Service Guide...
  • Page 409 Repair and Replacement Procedures Removing and Replacing the A26 Splitter Figure 7-16 A26 Splitter Removal Keysight N5244A/45A Service Guide 7-39...

  • Page 410: Removing And Replacing The A27 And A28 Mixer Bricks

    9. If replacing a mixer brick: ⑤ a. Remove the two screws (item ) from each shield. b. Remove 3 screws (not shown) that fasten each mixer brick to the mixer brick mounting block. Replacement Procedure 7-40 Keysight N5244A/45A Service Guide...
  • Page 411 Torque all RF cable connections to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Figure 7-17 A27 and A28 Mixer Bricks Removal Keysight N5244A/45A Service Guide 7-41...

  • Page 412: Brackets

    1. Reverse the order of the removal procedure. Torque all RF connectors to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-42 Keysight N5244A/45A Service Guide...
  • Page 413 Repair and Replacement Procedures Removing and Replacing the A29–A32 Reference Couplers and Reference Coupler Mounting Brackets Figure 7-18 A29 through A32 reference couplers Removal Keysight N5244A/45A Service Guide 7-43...

  • Page 414: 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 7-79. 7-44 Keysight N5244A/45A Service Guide...
  • Page 415 Repair and Replacement Procedures Removing and Replacing the A33–A36 Test Port Couplers Figure 7-19 A33 through A36 Test Port Couplers Removal Keysight N5244A/45A Service Guide 7-45...

  • Page 416: Removing And Replacing The A37 Reference Mixer Switch

    ) and torque the connectors to 10 in-lbs, then tighten the three mounting screws. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-46 Keysight N5244A/45A Service Guide...
  • Page 417 Repair and Replacement Procedures Removing and Replacing the A37 Reference Mixer Switch Figure 7-20 A37 Reference Mixer Switch Removal Keysight N5244A/45A Service Guide 7-47...

  • Page 418: Attenuators

    1. Reverse the order of the removal procedure. Torque all cable connections to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-48 Keysight N5244A/45A Service Guide...
  • Page 419 Repair and Replacement Procedures Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators Figure 7-21 Source and Receiver Attenuators Keysight N5244A/45A Service Guide 7-49...

  • Page 420: Removing And Replacing The A42-A45 Bias Tees

    Remember to place the wire harness cable ground lug on the proper mounting screw. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-50 Keysight N5244A/45A Service Guide...
  • Page 421 Repair and Replacement Procedures Removing and Replacing the A42–A45 Bias Tees Figure 7-22 A42 through A45 Bias Tees Removal Keysight N5244A/45A Service Guide 7-51...

  • Page 422: Removing And Replacing The A50-A53 Bypass Switches And The A54 Combiner

    9. Remove two screws that attach the bypass switch or the A54 combiner to the switch bracket. Replacement Procedure 1. Reverse the order of the removal procedure. Torque all cable connectors to 10 in-lbs. 7-52 Keysight N5244A/45A Service Guide...
  • Page 423 Repair and Replacement Procedures Removing and Replacing the A50–A53 Bypass Switches and the A54 Combiner 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Keysight N5244A/45A Service Guide 7-53...
  • Page 424 Repair and Replacement Procedures Removing and Replacing the A50–A53 Bypass Switches and the A54 Combiner Figure 7-23 A50 through A53 Bypass Switches and A54 Combiner Removal 7-54 Keysight N5244A/45A Service Guide...

  • Page 425: Removing And Replacing The A55 Solid State Drive (Ssd)

    Copy Unique Files from the SSD If installing an SSD for Windows XP: if the user has loaded unique calibration kit information, navigate to C:\Program Files\Keysight\Network Analyzer and copy USER_CALKITFILE to a USB flash memory drive. Also copy any personal user files that you wish to preserve.
  • Page 426 Install Backup Files onto the New SSD The files that were previously saved onto a USB flash memory drive must now be installed onto the new SSD. The network analyzer must be powered up and operating. 7-56 Keysight N5244A/45A Service Guide...

  • Page 427: Removing And Replacing The A56 Port 1 Noise Bypass Switch (Option H29)

    Do not overbend them. 8. Remove two screws that attach the bypass switch to the switch bracket. Replacement Procedure 1. Reverse the order of the removal procedure reusing the existing hardware. Torque all cable connectors to 10 in-lbs. Keysight N5244A/45A Service Guide 7-57...
  • Page 428 Repair and Replacement Procedures Removing and Replacing the A56 Port 1 Noise Bypass Switch (Option H29) 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-58 Keysight N5244A/45A Service Guide...
  • Page 429 Repair and Replacement Procedures Removing and Replacing the A56 Port 1 Noise Bypass Switch (Option H29) Figure 7-25 A56 Port 1 Noise Bypass Switch Removal Keysight N5244A/45A Service Guide 7-59...

  • Page 430: Removing And Replacing The A56 Port 1 Noise Bypass Switch (Option 029)

    A59 noise downconverter. Make note of the routing of this wire harness so that it can be rerouted later in the same manner. ③ 9. Remove two screws (item ) that secure the bracket of the A64 tuner/A56 bypass switch assembly to the chassis. 7-60 Keysight N5244A/45A Service Guide...
  • Page 431 1. Reverse the order of the removal procedure reusing the existing hardware. Torque all cable connectors to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Keysight N5244A/45A Service Guide 7-61...
  • Page 432 Repair and Replacement Procedures Removing and Replacing the A56 Port 1 Noise Bypass Switch (Option 029) Figure 7-26 A56 Port 1 Noise Bypass Switch Removal 7-62 Keysight N5244A/45A Service Guide...

  • Page 433: Noise Downconverter (Option H29)

    Do not overbend them. 8. Remove the assembly to be replaced from the bracket. Replacement Procedure 1. Reverse the order of the removal procedure reusing the existing hardware. Torque all cable connectors to 10 in-lbs. Keysight N5244A/45A Service Guide 7-63...

  • Page 434: Removing And Replacing The A57 Port 2 Noise Bypass Switch, A58 Port 2 Bridge, And A59 Noise Downconverter (Option H29)

    2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Figure 7-27 A57 Port 2 Noise Bypass Switch, A58 Port 2 Bridge, and A59 Noise Downconverter Removal (Option H29) 7-64 Keysight N5244A/45A Service Guide...
  • Page 435 Do not overbend them. 8. Remove the assembly to be replaced from the bracket. Replacement Procedure 1. Reverse the order of the removal procedure reusing the existing hardware. Torque all cable connectors to 10 in-lbs. Keysight N5244A/45A Service Guide 7-65...
  • Page 436 Removing and Replacing the A57 Port 2 Noise Bypass Switch and A59 Noise Downconverter (Option 029) 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. 7-66 Keysight N5244A/45A Service Guide...

  • Page 437: (Option 029)

    Repair and Replacement Procedures Removing and Replacing the A57 Port 2 Noise Bypass Switch and A59 Noise Downconverter (Option 029) Figure 7-28 A57 Port 2 Noise Bypass Switch and A59 Noise Downconverter Removal (Option 029) Keysight N5244A/45A Service Guide 7-67...

  • Page 438: Removing And Replacing The A64 Tuner

    10.Move the disconnected semirigid cables out of the way and remove the A64 tuner/A56 bypass switch assembly (with bracket) from the analyzer. It may be necessary to loosen the other end of the cables to allow them to be moved. Do not overbend them. 7-68 Keysight N5244A/45A Service Guide...
  • Page 439 1. Reverse the order of the removal procedure reusing the existing hardware. Torque all cable connectors to 10 in-lbs. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Keysight N5244A/45A Service Guide 7-69...
  • Page 440 Repair and Replacement Procedures Removing and Replacing the A64 Tuner Figure 7-29 A64 Tuner Removal 7-70 Keysight N5244A/45A Service Guide...

  • Page 441: 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 7-79. Keysight N5244A/45A Service Guide 7-71...
  • Page 442 Repair and Replacement Procedures Removing and Replacing the Rear Panel Figure 7-30 Rear Panel Removal 7-72 Keysight N5244A/45A Service Guide...

  • Page 443: Removing And Replacing The Front Panel Led Boards

    LED board from the analyzer. Replacement Procedure 1. Reverse the order of the removal procedure. 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Keysight N5244A/45A Service Guide 7-73...
  • Page 444 Repair and Replacement Procedures Removing and Replacing the Front Panel LED Boards Figure 7-31 Front Panel LED Boards Removal 7-74 Keysight N5244A/45A Service Guide...

  • Page 445: Removing And Replacing The Fans

    ⑤ c. Pull out the rivet completely (as shown by (item ) in the illustration) to release the fan and fan guard. Replacement Procedure 1. Reverse the order of the removal procedure. Keysight N5244A/45A Service Guide 7-75...
  • Page 446 Repair and Replacement Procedures Removing and Replacing the Fans 2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure. Refer to Table 7-2 on page 7-79. Figure 7-32 B1 Fan Removal 7-76 Keysight N5244A/45A Service Guide...

  • Page 447: 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 7-79. Keysight N5244A/45A Service Guide 7-77...
  • Page 448 Repair and Replacement Procedures Removing and Replacing the Lithium Battery Figure 7-33 Lithium Battery Removal 7-78 Keysight N5244A/45A Service Guide...

  • Page 449: Post-Repair Procedures

    Frequency Accuracy Test IF Gain Adjustment Source Power Accuracy Test Receiver Characterization Source Maximum Power Output Receiver Adjustment Test IF Response Adjustment (Option Source Power Linearity Test 090, 093, or 094 Only) The Operator’s Check Keysight N5244A/45A Service Guide 7-79...
  • Page 450 IF Response Adjustment (Option 090, 093, or 094 Only) A16 SPAM board Source Adjustment Noise Floor Test IF Gain Adjustment Trace Noise Test Receiver Characterization Receiver Adjustment IF Response Adjustment (Option 090, 093, or 094 Only) 7-80 Keysight N5244A/45A Service Guide...
  • Page 451 Chapter Re-enable all hardware options. (Refer “Option Entitlement Certificate” Chapter A24 IF multiplexer board Source Adjustment The Operator’s Check IF Gain Adjustment Receiver Characterization Receiver Adjustment IF Response Adjustment (Option 090, 093, or 094 Only) Keysight N5244A/45A Service Guide 7-81...
  • Page 452 Source Maximum Power Output IF Gain Adjustment Test Receiver Characterization Calibration Coefficients Test Receiver Adjustment Source Power Accuracy Test IF Response Adjustment (Option 090, 093, or 094 Only) A37 reference mixer switch No adjustment needed The Operator’s Check 7-82 Keysight N5244A/45A Service Guide...
  • Page 453 Source Power Accuracy Test (Option H29 or 029) (Available with Option H29 Calibration Coefficients Test Installed) The Operator’s Check Source Adjustment System Noise Figure Test Receiver Adjustment -or- Noise Figure Adjustment (Available with Option 029 Installed) Keysight N5244A/45A Service Guide 7-83...
  • Page 454 If a backup copy of receiver calibration data from the faulty disk drive is available, it can be copied to the new disk drive. If not, new data must be generated by performing the “Receiver Adjustment.” 7-84 Keysight N5244A/45A Service Guide...

  • Page 455: General Purpose Maintenance Procedures

    Keysight Microwave Network Analyzers 2-Port and 4-Port PNA-X 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 456: 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 Table 8-1 on preventive maintenance records or to the typical values listed in page 8-8. Keysight N5244A/45A Service Guide...

  • Page 457: 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 N5244A/45A Service Guide...
  • Page 458 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 N5244A/45A Service Guide...
  • Page 459 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 N5244A/45A Service Guide...

  • Page 460: 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 N5244A/45A Service Guide...
  • Page 461 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 N5244A/45A Service Guide...

  • Page 462: 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 N5244A/45A Service Guide...
  • Page 463 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 N5244A/45A Service Guide...
  • Page 464 After verifying the cable and its connections, suspect the analyzer switch splitter, step attenuator, coupler, or receivers, and associated cabling. “Checking the Receiver Group” on page 4-44 To troubleshoot, refer to or to “Checking the Signal Separation Group” on page 4-39. 8-10 Keysight N5244A/45A Service Guide...

  • Page 465: Option Enable Utility

    Using the current Host ID will cause a license to be generated that will not work with the instrument. To determine the new Host ID, use the utility at the below listed web site with the new model number. http://na.support.keysight.com/pna/upgrades.html Keysight N5244A/45A Service Guide 8-11...

  • Page 466: Enabling Or Removing Options

    These options are enabled using the option enable utility and require a special license key. Some applications require a license key that is provided by Keysight. If you do not have the required license key, contact Keysight for assistance.

  • Page 467: 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 solid state drive and the frequency reference board is lost, it can not be recovered. Contact Keysight for assistance. Refer to “Contacting Keysight” on page 2-7.

  • Page 468: 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 2-7. Installing or Changing a Serial Number It is necessary to reinstall the instrument serial number if the test set motherboard is replaced.

  • Page 469: Firmware Upgrades

    If your network analyzer is connected to the Internet, there are two methods available for checking the availability of, and downloading, new firmware: — Download directly from: http://www.keysight.com/find/pna. (Select your analyzer’s model number in this web site to view available upgrades.)

  • Page 470: Operating System Recovery

    Recovering from Solid State Drive Problems If you suspect that you have a solid state drive problem, go to the “Hard Drive Recovery” link on the Keysight PNA Series: Service & Support Home Page on the Internet. The URL for the Keysight PNA Series: Service & Support Home Page is: http://na.support.keysight.com/pna/...

  • Page 471: Correction Constants

    — Navigate to the EEPROM Backup Utility, located at: C:\Program Files\Keysight\Network Analyzer\Service\eebackup.exe — Run the program. — Click Backup EEPROM. — Click Exit when the program has finished. Keysight N5244A/45A Service Guide 8-17...
  • Page 472 General Purpose Maintenance Procedures Correction Constants 8-18 Keysight N5244A/45A Service Guide...
  • Page 473 7-18 6-17 A2 USB board troubleshooting removal and replacement 4-38 illustrated 6-15 illustrated , 7-17, 7-20 part number 6-13 troubleshooting 4-35 removal and replacement A15 13.5 GHz LO synthesizer illustrated 7-12 A receiver board Keysight N5244A/45A Service Guide...
  • Page 474 6-152 6-152 A29 test port 1 reference removal and replacement removal and replacement coupler illustrated illustrated 7-43 7-35 illustrated procedure , 6-25, 6-31, 6-38, procedure 7-42 7-34 6-45, 6-54, 6-64, 6-72, 6-81, troubleshooting troubleshooting 4-42 4-47 Keysight N5244A/45A Service Guide...
  • Page 475 6-45, 6-54, 6-64, 6-72, 6-81, procedure attenuator 7-48 6-90, 6-100, 6-111, 6-124, 6-140, troubleshooting illustrated , 6-31, 6-38, 6-45, 4-43 6-154 A41 test port 2 source step 6-54, 6-64, 6-72, 6-90, 6-100, operation 5-25 attenuator 6-111, 6-124, 6-140, 6-154 Keysight N5244A/45A Service Guide...
  • Page 476 4-39 removal and procedure 7-52 A7, A8, A12, and A13 doublers replacement , 7-15, A55 solid state drive 7-18 operation 5-13 illustrated , 7-17, 7-20 illustrated A8 doubler 6-20 troubleshooting operation 4-38 illustrated 5-34 6-20 Keysight N5244A/45A Service Guide...
  • Page 477 5-39 4-32 analyzer A56 test port 1 option SPAM accessories H29 switch board–analog 5-36 block diagram A57 test port 2 option digital control 029 switch SPAM 5-39 group 5-31 A57 test port 2 option board–digital Keysight N5244A/45A Service Guide...
  • Page 478 6-69 part numbers 6-37 adjustment part numbers 3-50 6-68 replaceable RF cables battery bottom assembly, illustrated 6-41 disposal Option 224/H85/029 1-10 part numbers 6-39 illustrated replaceable parts 6-20 replaceable ribbon cables part number , 6-17, 6-181 Keysight N5244A/45A Service Guide...
  • Page 479 , 6-141, illustrated , 6-103, 6-105 GPIB part numbers 6-144 , 6-101, part numbers replaceable ribbon cables 6-180 6-104 required for servicing illustrated 6-149 replaceable ribbon cables substitution part numbers 3-25 illustrated 6-147 6-108 test port Keysight N5244A/45A Service Guide...
  • Page 480 Option 224 Option 400 in bottom assembly, illustrated illustrated 6-51 6-85 Option 219 part numbers part numbers 6-49 6-82 illustrated 6-36 in bottom assembly, in bottom assembly, part numbers 6-35 Option 224/029 Option 419 illustrated 6-62 Keysight N5244A/45A Service Guide...
  • Page 481 3-20 Option 423/H85/029 repeatability constants illustrated 6-164 correction 8-17 part numbers contacting Keysight 6-162 insertion loss 3-16 in top assembly, all options controllers magnitude and phase illustrated troubleshooting with 6-23 4-22 Keysight N5244A/45A Service Guide...
  • Page 482 4 board removal warning functional description of illustrated 6-20 CPU board functional group part number 6-17 illustrated operation 6-20 5-30 removal and replacement operation directivity 5-33 illustrated , 7-17, 7-20 part number cause of failure 6-17 Keysight N5244A/45A Service Guide...
  • Page 483 4-34 flowgraph of one port illustrated 6-12 flowgraph of two port , 8-4, 8-5, part number 6-11 assemblies interconnects replaceable parts 5-32 6-167 identifying using interface board bracket flowgraphs illustrated 6-15 removal isolation 8-10 Keysight N5244A/45A Service Guide...
  • Page 484 5-20 part number 6-17 nameplate part number , 6-24, 6-30, 6-37, removal and replacement illustrated 6-12 6-44, 6-52, 6-63, 6-70, 6-80, illustrated 7-31 part number 6-88, 6-99, 6-109, 6-121, 6-138, 6-11 procedure 7-30 operation 6-152 5-32 Keysight N5244A/45A Service Guide...
  • Page 485 4-36 rack mount load match part numbers 5-15 6-181 cause of failure 8-10 verification , 2-5, definition of knob 5-15 measurements affected front panel GPIB 5-34 illustrated HANDLER I/O 6-12 5-15 locating part number 6-11 5-34 Keysight N5244A/45A Service Guide...
  • Page 486 26.5 GHz source boards illustrated 5-13 , 7-59, 7-62 operation 5-25 A56 test port 1 option 029 procedure part number , 7-57, 7-60 , 6-24, 6-30, 6-37, switch 5-39 noise bypass switch, port 2 6-44, 6-52, 6-63, 6-70, 6-80, Keysight N5244A/45A Service Guide...
  • Page 487 6-82 5-27 replaceable wire harnesses replaceable ribbon cables SPAM board–digital 5-33 illustrated 6-43 illustrated system motherboard 6-87 5-32 part numbers 6-42 test port couplers part numbers 5-20 6-86 Option 224, bottom assembly test set motherboard 5-15 Keysight N5244A/45A Service Guide...
  • Page 488 224/H85/029 illustrated required for servicing 6-134 part numbers part numbers 6-132 accessories bottom assembly, replaceable wire harnesses illustrated Option 400 6-181 6-134 6-80 cables part numbers bottom assembly, 6-132 GPIB 6-180 Option 419 6-88 Keysight N5244A/45A Service Guide...
  • Page 489 6-26 6-86 bottom assembly, Option 224/029 bottom assembly, Option 219 Option 419 6-32 6-60 6-96 bottom assembly, bottom assembly, bottom assembly, Option 219/H85 Option 224/H85 Option 419/H85 6-39 6-68 6-106 bottom assembly, bottom assembly, bottom assembly, Keysight N5244A/45A Service Guide...
  • Page 490 6-165 in bottom assembly, Option compression in top assembly, all options illustrated , 6-168, 6-170 illustrated 6-81 software, internal 3-32 part numbers , 6-17, 6-20, part numbers 6-80 source maximum power 6-169 output 3-33 locating Keysight N5244A/45A Service Guide...
  • Page 491 6-165 accuracy test 3-32 troubleshooting 6-154 4-21 linearity test 3-34 removal and replacement maximum test 3-33 illustrated troubleshooting , 7-59, 7-62 4-21 pre-repair procedure rebuilt-exchange assemblies , 7-57, 7-60 procedures program Port 2 caution about receiver Keysight N5244A/45A Service Guide...
  • Page 492 , 6-80, 6-88, illustrated 6-23 7-49 6-99, 6-109, 6-121, part numbers 6-21 troubleshooting 4-46 6-138, 6-152 replaceable hardware receiver characterization troubleshooting 4-42 in external analyzer adjustment 3-51 reference mixer switch illustrated 6-179 receiver group part numbers 6-178 Keysight N5244A/45A Service Guide...
  • Page 493 , 6-114, 6-117, in bottom assembly, Option locating reference 6-143 illustrated part numbers , 6-112, 6-90 designator part numbers miscellaneous analyzer 6-88 6-115 in bottom assembly, Option in bottom assembly, part numbers 6-180 419/H85 Option 423/029 ordering information Keysight N5244A/45A Service Guide...
  • Page 494 A16 SPAM board part numbers 6-86 Option 224/H85/029 illustrated , 7-17, 7-20 in bottom assembly, illustrated procedure 6-79 Option 419 , 7-15, 7-18 part numbers A17 13.5 GHz source 2 illustrated 6-77 6-98 synthesizer board part numbers 6-96 Keysight N5244A/45A Service Guide...
  • Page 495 A44 test port 4 bias tee procedure , 7-57, 7-60 coupler illustrated A57 port 2 noise bypass , 7-49, 7-51 illustrated 7-43 procedure switch , 7-48, 7-50 procedure 7-42 illustrated A45 test port 2 bias tee 7-70 Keysight N5244A/45A Service Guide...
  • Page 496 6-82 part numbers 6-60 illustrated 7-12 in bottom assembly, in bottom assembly, procedure 7-12 Option 419 Option 224/H85 rear panel illustrated , 6-93, 6-95 illustrated 6-69 illustrated 7-72 part numbers , 6-91, 6-94 part numbers 6-68 Keysight N5244A/45A Service Guide...
  • Page 497 5-34 removal and replacement illustrated in external analyzer 6-20 illustrated 7-49 installing backup files illustrated 6-179 procedure 7-48 onto part numbers 7-56 6-178 troubleshooting 4-43 operation 5-34 in rear panel assembly SPAM board part number 6-17 Keysight N5244A/45A Service Guide...
  • Page 498 3-34 6-178 getting ready system noise figure 3-43 subgroup specifications test port output power data acquisition and verification , 3-1, 3-8, 3-22 linearity 3-34 processing 5-30 dialog box 3-26 trace noise 3-36 front panel 5-30 Keysight N5244A/45A Service Guide...
  • Page 499 7-42 removal and replacement illustrated troubleshooting , 7-64, 7-67 4-42 illustrated test port 2 source step , 7-59, procedure 7-62 , 7-63, 7-65 procedure attenuator , 7-57, 7-60 test port 2 coupler Keysight N5244A/45A Service Guide...
  • Page 500 , 6-88, 6-99, 6-109, illustrated , 6-25, 6-31, 6-38, illustrated , 6-81, 6-90, 6-100, 6-121, 6-138, 6-152 6-45, 6-54, 6-64, 6-72, 6-81, removal and replacement 6-111, 6-124, 6-140, 6-154 6-90, 6-100, 6-111, 6-124, 6-140, illustrated 7-49 6-154 Keysight N5244A/45A Service Guide...
  • Page 501 A49 test port 2 receiver step board 4-38 receiver R 4-29 attenuator A14 frequency reference 4-46 4-16 A5 26.5 GHz source 1 board 4-35 signal separation group 4-41 board A15 13.5 GHz LO synthesizer 4-38 source group board 4-36 Keysight N5244A/45A Service Guide...
  • Page 502 Option 423 illustrated analyzer 7-12 illustrated procedure warning 6-120 7-11 part numbers for servicing troubleshooting 6-118 4-16 warranty in bottom assembly, USB controller board service Option 423/029 front panel Keysight N5244A/45A Service Guide...
  • Page 503 Index illustrated 6-134 part numbers 6-132 in bottom assembly, Option 423/H85 illustrated 6-149 part numbers 6-147 in bottom assembly, Option 423/H85/029 illustrated 6-164 part numbers 6-162 Keysight N5244A/45A Service Guide...
  • Page 504 Index Keysight N5244A/45A Service Guide...
  • Page 505 Installation Note Xxxxx-xxxxx...
  • Page 506 This information is subject to change without notice. © Keysight Technologies 2010-2016 Edition 2, December 2016 N5245-90001 www.keysight.com...

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