Agilent Technologies PSG Series Service Manual

Agilent Technologies PSG Series Service Manual

Signal generator
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Summary of Contents for Agilent Technologies PSG Series

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 This guide applies to the signal generator models and associated serial number prefixes listed below. Depending on your firmware revision, front panel operation may vary from descriptions in this guide. E8241A: US4124 E8244A: US4124 E8251A: US4124 E8254A: US4124 Part Number: E8251-90030 Printed in USA July 2001 © Copyright 2001 Agilent Technologies.
  • Page 4: Table Of Contents

    Contents 1. Troubleshooting Before Troubleshooting ............1-2 ESD Information .
  • Page 5 Contents Troubleshooting Unlevels ............1-49 Troubleshoot and correct any unlock problems before troubleshooting unleveled problems.
  • Page 6 Contacting Agilent Technologies ........
  • Page 7 Contents A2 Display ..............2-12 Tools Required .
  • Page 8 Contents Tools Required ............2-30 Removal Procedure .
  • Page 9 Contents Removal Procedure ............2-48 Replacement Procedure .
  • Page 10 Save Money with Rebuilt-Exchange Assemblies ........3-3 Shipping the Defective Assembly Back to Agilent Technologies ......3-4 Abbreviations Used in Part Descriptions .
  • Page 11 Contents Battery-Lithium ............3-20 Cables .
  • Page 12 Contents 5. Safety and Regulatory Safety and Regulatory ............5-2 General Safety Considerations .
  • Page 13 Contents...
  • Page 14: Troubleshooting

    Troubleshooting...
  • Page 15: Before Troubleshooting

    Troubleshooting Before Troubleshooting Before Troubleshooting WARNING These troubleshooting instructions are for use by qualified personal only. To avoid electrical shock, do not perform any troubleshooting unless qualified. WARNING The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the signal generator from all voltage sources before it is opened.
  • Page 16: Getting Started With Troubleshooting

    Troubleshooting Getting Started with Troubleshooting Getting Started with Troubleshooting Determine the starting point in Table1-1 to begin troubleshooting. • Problems should be worked on in the order they are presented in this table. • Overviews of Self-Test, Synthesis Loop, RF Path and Instrument are found in this chapter. The information in these overviews may help the reader better understand how the signal generator operates and the function of each assembly.
  • Page 17: Ilt-1 Power Supply Failure And Self-Test

    Troubleshooting Getting Started with Troubleshooting ILT-1 Power Supply Failure and Self-Test When the signal generator appears to be dead (no display or fan) there is often little evidence that points directly to the cause. This section provides steps and solutions to typical failure modes. Immediately unplug the signal generator from the ac power line if the unit shows any of the CAUTION following symptoms:...
  • Page 18: Ilt-2 Temperature Related Power Supply Failure

    Troubleshooting Getting Started with Troubleshooting ILT-2 Temperature Related Power Supply Failure Thermal Shutdown When a thermal shutdown condition occurs, the front panel green LED and the power supply LEDs will blink until the condition is eliminated. Two thermistors in the signal generator monitor temperature. One is located in the A19 Power Supply and the other is located on the A8 Output.
  • Page 19: Ilt-3 A18 Cpu Turn-On Test

    Troubleshooting Getting Started with Troubleshooting ILT-3 A18 CPU Turn-On Test A18 CPU Turn-On Test At turn-on, the A18 CPU is designed to complete a series of operational checks. If all power supply voltages are present and the A18 CPU is working correctly, the operational checks are completed. Errors are reported if the A18 CPU has problems identifying other assemblies or communicating with the backup memory located on the A31 Motherboard.
  • Page 20 Troubleshooting Getting Started with Troubleshooting Checking the A18 CPU Voltages 1. With the external and internal covers removed and the signal generator on its side, turn power on and check to see if all the power supply LEDs on the A31 Motherboard are on. If any of the power supply LEDs are not on, refer to “Power Supplies”...
  • Page 21 Troubleshooting Getting Started with Troubleshooting Verifying the A18 CPU Turn-On Sequence Verify the A18 CPU turn-on sequence by observing DS1 to DS8 (located along the top) sequence patterns. DS1 to DS8 should match the sequence shown in Table1-4. Before verifying the turn-on sequence, make sure all switches in the upper left-hand corner of the A18 CPU are in the CLOSED (up) position.
  • Page 22: Ilt4 Front Panel Display Troubleshooting

    Troubleshooting Getting Started with Troubleshooting ILT4 Front Panel Display Troubleshooting Overview The Front Panel Display Assembly consists of the A1 Keyboard, A2 Display (640 x 320 pixels Liquid Crystal Display), A3 Power Switch, and the A4 Inverter dc to ac). The A4 Inverter turns the A2 Display on and off via control lines received from the A18 CPU.
  • Page 23: Symptom: Bright Display Without Characters

    Troubleshooting Getting Started with Troubleshooting Symptom: Bright Display Without Characters Ensure that the signal generator is powered-on and the front panel green LED is on. If the green LED is not on refer to “Power Supplies” on page 1-17. If the green LED is lit and the display is still too bright, try adjusting the contrast controls on the front panel.
  • Page 24 Troubleshooting Getting Started with Troubleshooting The pulse state signals listed in Table 1-6 on page 1-10 are control lines, clock, and data for the A2 Display. If any of the above signals are bad, use Table1-7 to check them at P221 of A31 Motherboard. If the signals in table 1-9 are good, then check the signals in Table1-8 at J9 of the A3 Power Switch.
  • Page 25: Symptom: Hardkeys Or Softkeys Not Functioning

    Troubleshooting Getting Started with Troubleshooting Symptom: Hardkeys or Softkeys Not Functioning Ensure that the signal generator is powered-on and the front panel green LED is on. If the green LED is not on refer to “Power Supplies” on page 1-17 for troubleshooting.
  • Page 26 Troubleshooting Getting Started with Troubleshooting If a front panel hardkey or softkey is not functioning, use an oscilloscope to monitor the KEYCOLx and KEYROWx pins at P13 on the A31 Motherboard. Use Table1-10 to identify the appropriate pin number. The KEYROW pin should be a TTL low and the KEYCOL pin should be a TTL high.
  • Page 27: Symptom: Rpg Knob Not Functioning

    Troubleshooting Getting Started with Troubleshooting Symptom: RPG Knob Not Functioning Ensure that the signal generator is powered-on and the front panel green LED is on. If the green LED is not on refer to “Power Supplies” on page 1-17 for troubleshooting. When the RPG is functioning properly DS1 on the A18 CPU will blink when the RPG knob is rotated.
  • Page 28: Self-Test Failures And Related Troubleshooting

    Troubleshooting Self-Test Failures and Related Troubleshooting Self-Test Failures and Related Troubleshooting This section has a two column table: one column has self-test errors and a second column has a list of sections to go for assembly level troubleshooting procedures. Table 1-12 Self-Test Failures and Related Troubleshooting If a self-test for this Go to this assembly troubleshooting section...
  • Page 29 Troubleshooting Self-Test Failures and Related Troubleshooting Table 1-12 Self-Test Failures and Related Troubleshooting If a self-test for this Go to this assembly troubleshooting section... assembly fails... A10 ALC “Self-Tests 9xx: A10 ALC Self-Test Errors” on page 1-34 900 Power Supply 901 Detector Test 902 Detector Level to ALC Ref 903 Level Test...
  • Page 30: Troubleshooting Assembly Level Problems

    Troubleshooting Troubleshooting Assembly Level Problems Troubleshooting Assembly Level Problems Power Supplies The power supply is a switching supply that has an automatic line-voltage and frequency selection. There are no switches to change for 115 Vac or 240 Vac operation. The power line fuse is not replaceable. If the fuse opens, the power supply must be replaced.
  • Page 31 Troubleshooting Troubleshooting Assembly Level Problems Table 1-13 Power Supplies vs. Assembly Matrix (1 of 3) Motherboard +32 Vdc +15 Vdc +10 Vdc +8 Vdc +9 Vdc +5.2 Vdc test points for: A1 Keyboard P13-2 A2 Display P11-44 A2DS1 Backlight A3 Power Supply P231-1,4 P231-3,4,43,44 P231-15,18,19,55,56,...
  • Page 32 Troubleshooting Troubleshooting Assembly Level Problems Table 1-14 Power Supplies vs. Assembly Matrix (2 of 3) Motherboard +5.2 Digital +3.4 Digital +2.6 Vdc -7 Vdc -6 Vdc test points for: A1 Keyboard A2 Display P12-1 A2DS1 Backlight P12-1 A3 Power Supply P231-21,22,2561,62, P231-28,29,32,35, P231-9,10,49,50...
  • Page 33 Troubleshooting Troubleshooting Assembly Level Problems Table 1-15 Power Supplies vs. Assembly Matrix (3 of 3) Motherboard -15 Vdc -5.2 Vdc +12 Vdc +15 Vdc stby Fan Voltage test points for: A1 Keyboard A2 Display P11-43 A2DS1 Backlight A3 Power Supply P231-12,13,52,53 P231-80 A5 Sampler...
  • Page 34 Troubleshooting Troubleshooting Assembly Level Problems Amber Standby LED not working With the power turned off, and the signal generator plugged in, the front panel amber standby LED and the +15 Vdc standby LED on the motherboard should be on. The amber Standby LED is controlled by a +15 Vdc standby line supplied by the power supply, which is routed through the motherboard to the front panel.
  • Page 35 Troubleshooting Troubleshooting Assembly Level Problems assemblies may be loading down the supply. Refer to the Power Supply vs. Assembly Matrix (Table 1-13 on page 1-18) to find out where each supply is being used. To isolate the defective assembly, power down the signal generator and remove one of the assemblies being biased by the faulty supply.
  • Page 36 Troubleshooting Troubleshooting Assembly Level Problems LEDs for +9, -6 or -5.2 Vdc Power Supplies Not Working These supplies are generated on the A9 YIG Driver. To troubleshoot, make sure the A9 YIG Driver is receiving the +32, +15, +10, -7, -15 Vdc supplies. These can be measured at P112 on the A31 Motherboard.
  • Page 37: Self-Tests 2Xx: A5 Sampler Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 2xx: A5 Sampler Self-Test Errors Figure 1-2 Before proceeding to the reported self-test error code, check the voltages in Table1-17. If any voltages are out of specification troubleshoot the supply problem first. Table 1-17 Supply Connector Minimum...
  • Page 38 Troubleshooting Troubleshooting Assembly Level Problems troubleshooting procedure. 201 Tuning + Bias Test 1. Turn power off and remove the A5 Sampler and connect a signal analyzer to the A5 Sampler J1 input cable on the A31 Motherboard. 2. Turn the signal generator on and check for the presence of a 1 GHz signal at the level of 0 dBm. 3.
  • Page 39: Self-Tests 3Xx: A7 Reference (Standard) Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 3xx: A7 Reference (Standard) Self-Test Errors Figure 1-3 Before proceeding to the reported self-test error code, check the voltages in Table1-18. If any of the voltages are out of specification troubleshoot the supply problem first. Table 1-18 Supply Connector...
  • Page 40: Self-Tests 4Xx: A8 Output Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 4xx: A8 Output Self-Test Errors Figure 1-4 Before proceeding to the reported self-test error code, check the voltages in Table1-19. If any voltages are out of specification troubleshoot the supply problem first. Table 1-19 Supply Connector Minimum...
  • Page 41 Troubleshooting Troubleshooting Assembly Level Problems should be at 3 GHz and ≥0 dBm. 2. If the signal is not present or at the correct level, replace the Frac-N. 3. If the signal is present, replace the A8 Output. Don’t re-install the A8 Output with the signal generator powered up. This could WARNING cause serious damage to the signal generator.
  • Page 42: Self-Tests 6Xx: A9 Yig Driver Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 6xx: A9 YIG Driver Self-Test Errors Figure 1-5 Before proceeding to the reported self-test error code, check the voltages in Table1-20. If any voltages are out of specification troubleshoot the supply problem first. Table 1-20 Supply Connector Minimum...
  • Page 43 Troubleshooting Troubleshooting Assembly Level Problems Table 1-20 Supply Connector Minimum Maximum Origin Voltage Pins Value Value (Vdc) (Vdc) (Vdc) +3.4 Digital Low P111-60, 61, +3.29 +3.5 Main Supply 62, 63, 125, 126, 127, 128 A9 YIG Driver Output Voltages If any of the voltages in Table1-21 are out of specification, replace the A9 YIG Driver.
  • Page 44: Self-Tests 7Xx: A6 Frac-N Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 7xx: A6 Frac-N Self-Test Errors Figure 1-6 Before proceeding to the reported self-test error code, check the voltages in Table1-22. If any voltages are out of specification troubleshoot the supply problem first. Table 1-22 Supply Connector Minimum...
  • Page 45 Troubleshooting Troubleshooting Assembly Level Problems 701 Loop Gain 1. Replace the A6 Frac-N. 702 Tuning Voltage 1. Check 10 MHz Synthesis line on P33-15 using an oscilloscope. The signal period should be 100 ns with an amplitude of approximately 3 V 2.
  • Page 46 Troubleshooting Troubleshooting Assembly Level Problems 3. If the signal out the A29 20 GHz Doubler is bad, replace the A29 20 GHz Doubler. 4. If the signal at J1 is good, turn power off and reinstall the A6 Frac-N. 5. Power the signal generator on and remove the A8 Output. Use an extender cable to connect a spectrum analyzer to J4.
  • Page 47: Self-Tests 9Xx: A10 Alc Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 9xx: A10 ALC Self-Test Errors Figure 1-7 Before proceeding to the reported self-test error code, check the voltages in Table1-24. If any voltages are out of specification troubleshoot the supply problem first. Table 1-24 Supply Connector Minimum...
  • Page 48 Troubleshooting Troubleshooting Assembly Level Problems 900 Power Supply 1. Replace the 10 ALC. 901 Detector Test 1. Turn the signal generator’s RF power on and set the frequency to 10 GHz and the RF power level to +25 dBm. Disconnect the cable from J3 of the A10 ALC (W15) and connect the cable to a digital voltmeter. The digital voltmeter should measure -0.6 Vdc.
  • Page 49: Self-Tests 10Xx: A7 Reference (Option Unj) Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 10xx: A7 Reference (Option UNJ) Self-Test Errors Figure 1-8 Before proceeding to the reported self-test error code, check the voltages in Table1-25. If any voltages are out of specification troubleshoot the supply problem first. Table 1-25 Supply Connector...
  • Page 50 Troubleshooting Troubleshooting Assembly Level Problems 1001 10 MHz Test 1. Using an oscilloscope, check P41-2 for a 10 MHz signal greater than 1.12 V . If the signal is present, replace the A7 Reference. 2. If the signal is not present, replace the internal 10 MHz standard. 1002 1 GHz Test 1.
  • Page 51: Self-Tests 11Xx: A18 Cpu Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 11xx: A18 CPU Self-Test Errors Figure 1-9 1100 Power Supply The A18 CPU self-test verifies the presence of the supplies listed. These supplies are not checked during the turn-on check and are not necessary for the turn-on check to pass. 1.
  • Page 52 Troubleshooting Troubleshooting Assembly Level Problems 5. If a supply voltage is not present on the connector, measure the appropriate point. Table 1-27 Connector P112 Supply Voltage Voltage Range Pin 1, 2, 26, 27 -5.2 Vdc -5.2 .1 Vdc Pin 19, 44 -6 Vdc -6 .1 Vdc Pin 17, 18, 42...
  • Page 53: Self-Tests 12Xx: A26 Mid Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 12xx: A26 MID Self-Test Errors Figure 1-10 Before proceeding to the reported self-test error code, check the voltages in Table1-28. If any of these voltages are out of specification troubleshoot the supply problem first. Table 1-28 Supply Connector...
  • Page 54 Troubleshooting Troubleshooting Assembly Level Problems run self-test 1200. If the test passes after disconnecting one or more microcircuits, replace the microcircuit. If self-test still fails after disconnecting all the microcircuits, replace the A26 MID. The table below shows the power supply each microcircuit. Table 1-29 Microcircuit A26 MID...
  • Page 55 Troubleshooting Troubleshooting Assembly Level Problems 1204 RF Path This test checks for a dc voltage on the A10 ALC from the A23 Low Band Coupler/Detector and A24 High Band Coupler and A25 High Band Detector. 1. Connect a spectrum analyzer to the RF output of the signal generator. Turn the RF power on and verify the presence of an RF signal on the output.
  • Page 56: Self-Tests 13Xx: A11 Analog/Pulse Modulation Generator Self-Test Errors

    Troubleshooting Troubleshooting Assembly Level Problems Self-Tests 13xx: A11 Analog/Pulse Modulation Generator Self-Test Errors Figure 1-11 Before proceeding to the reported self-test error code, check the voltages in Table1-30. If any of these voltages are out of specification troubleshoot the supply problem first. Table 1-30 Supply Connector...
  • Page 57 Troubleshooting Troubleshooting Assembly Level Problems 1301 Internal Pulse Generator Clock 1. Using an oscilloscope, measure P131-91 for a 10 MHz signal at 3.5 V 2. If the signal is good, replace the A11 Pulse/Analog Modulation Generator. 3. If the signal is bad, check P41-7. If the signal is good on P41-7, replace the A31 Motherboard 4.
  • Page 58 Troubleshooting Troubleshooting Assembly Level Problems 1314 External 2 1. Replace A11 Pulse/Analog Modulation Generator. 1315 AM Path Loss 1. Replace A11 Pulse/Analog Modulation Generator. 1-45...
  • Page 59: Troubleshooting Unlocks

    Troubleshooting Troubleshooting Unlocks Troubleshooting Unlocks The phase lock loop refers to part of the frequency generating circuit used to maintain the phase relationship between the frequency generation loop and a reference frequency. By maintaining the phase relationship the frequency accuracy of the signal generator is guaranteed. To maintain frequency accuracy the phase lock loop compares the phase of a signal from the reference assembly to the phase of the frequency loop signal.
  • Page 60: 520 Sampler Unlocked

    Troubleshooting Troubleshooting Unlocks 3. If the 10 MHz signal is bad, replace the A32 10 MHz Crystal Oscillator. 4. If the signal is good, replace the A7 Reference. 520 Sampler Unlocked A 520 Sampler unlock message indicates a failure of the A5 Sampler VCO loop. 1.
  • Page 61: 626 Internal Mod Source Unlock

    Troubleshooting Troubleshooting Unlocks 626 Internal Mod Source Unlock A 626 Internal Mod Source Unlock error message indicates a problem with the digital 10 MHz signal to the A11 Pulse/Analog Modulation Generator. This error message is turned on if the signal generator is in phase modulation mode and there is a problem with the 10 MHz digital signal to the in phase clock.
  • Page 62: Troubleshooting Unlevels

    Troubleshooting Troubleshooting Unlevels Troubleshooting Unlevels A leveled output power is obtained comparing a detected voltage with a reference voltage. The reference voltage is generated using DACs on the A10 ALC and the detected voltage is generated by coupling off a portion of the RF output signal and converting it to dc using detector diodes.
  • Page 63 Troubleshooting Troubleshooting Unlevels • Set Stop Frequency to 3.25 GHz • Set Reference Level to +30 dBm • Set Display to Max Hold b. Connect the RF output of the signal generator to the spectrum analyzer. Measure and record the minimum power level.
  • Page 64 Troubleshooting Troubleshooting Unlevels 4. For each of the failed conditions listed, always start with the signal generator set to the following settings. • ALC Mode ALC Off • Amplitude +30 dBm • Attenuator Hold Mod On • RF On • Modulation Off Conditions: 5.
  • Page 65 Troubleshooting Troubleshooting Unlevels adjusted to this level, troubleshoot the RF path. • Remove the cable from J3 on the A10 ALC and measure the dc voltage on the center pin of the cable. The dc voltage should be -.150 mVdc .05 Vdc . •...
  • Page 66: Troubleshooting Adjustment Problems

    Troubleshooting Troubleshooting Adjustment Problems Troubleshooting Adjustment Problems When an adjustment does not work or fails to resolve a problem and all self-tests have passed, use the following table to locate the most likely failure. Table 1-34 Troubleshooting Help for Failed Adjustments Adjustment that is failing...
  • Page 67 Troubleshooting Troubleshooting Adjustment Problems Table 1-34 Troubleshooting Help for Failed Adjustments Adjustment that is failing... Assemblies most likely causing failure... Attenuator Calibration-High Band and Low Power RF Path ALC Modulator Calibration A30 Modulation Filter A8 Output AM Gain Calibration A11 Pulse Modulation Generator Gain Adjustment Bypass Calibration A8 Output (Frequencies ≤...
  • Page 68: Troubleshooting Adc Adjustment Failures

    Troubleshooting Troubleshooting ADC Adjustment Failures Troubleshooting ADC Adjustment Failures The ADC adjustment adjusts the ADC reference voltage to match the A18 CPU +10 Vdc reference. There are three reasons the adjustment could fail: •problems with the +10 Vdc reference •A18 CPU problems •analog mux on another assembly is starting to fail Procedure: 1.
  • Page 69: Troubleshooting Performance Test Problems

    Troubleshooting Troubleshooting Performance Test Problems Troubleshooting Performance Test Problems When a performance test fails and all self-tests have passed, use the following table to locate the most likely failure. Table 1-35 Troubleshooting Performance Test Problems Performance test that is failing... Action to perform...
  • Page 70 Troubleshooting Troubleshooting Performance Test Problems Table 1-35 Troubleshooting Performance Test Problems Performance test that is failing... Action to perform... External Phase Modulation Deviation Accuracy Perform FM adjustments. If still failing check A11 Pulse/Analog Modulation Generator and A6 Frac-N. If the frequency is ≤3.2 GHz, check the External Pulse Modulation ON/OFF Ratio A11 Pulse/Analog Modulation Generator or the A8 Output.
  • Page 71: Troubleshooting The Rf Path

    Troubleshooting Troubleshooting the RF Path Troubleshooting the RF Path Troubleshooting RF Path procedure: • preset the signal generator • set a frequency • open ALC loop (ALC Off) • set signal generator to maximum power • check power levels in the RF path (power levels are included on the RF block diagram) ALC and RF problems 1.
  • Page 72: Troubleshooting Pulse Modulation

    Troubleshooting Troubleshooting the RF Path •press Frequency - set signal generator to frequency in problem area •press Amplitude - set to +25 dBm •press RF ON/OFF - turn RF On •turn ALC Off •Power Search Manual •Do Power Search 4. Using the RF Path Block Diagram, check the power levels at the points shown. 5.
  • Page 73 Troubleshooting Troubleshooting the RF Path Troubleshooting Problems >3.2 GHz 11. If the pulse modulation problem occurs >3.2 GHz, remove the cable A30 Modulation Filter J7 (W17). Probe the end of the cable. Compare the results with Table1-38. Table 1-38 Pulse On Pulse Off +5 Vdc 0 to +5 Vdc (pulses at modulation rate)
  • Page 74: Troubleshooting At1 Attenuator

    Troubleshooting Troubleshooting the RF Path Troubleshooting AT1 Attenuator Starting from +25 dBm, the attenuator steps when the power is changed from between +5.1 dBm and +5.0 dBm. Continuing to lower the power level, the next switch occurs between -4.99 dBm and -5.0 dBm. The next change is between -14.99 dBm and -15.0 dBm and so on.
  • Page 75: Troubleshooting Harmonic Spurious

    Troubleshooting Troubleshooting Harmonic Spurious Troubleshooting Harmonic Spurious Harmonics are multiples of the output frequency. The second harmonic is two times the output frequency at an x dBc down. If the harmonic falls beyond the frequency range of the signal generator, the harmonic is not specified or measured.
  • Page 76: 40 Ghz Models Only

    Troubleshooting Troubleshooting Harmonic Spurious 20 GHz Models Harmonic problems with a fundamental frequency between 3.2 GHz and 20 GHz 1. Set the signal generator as follows: • Frequency - set to harmonic frequency to be measured • Amplitude +10 dBm •...
  • Page 77 Troubleshooting Troubleshooting Harmonic Spurious 3. Set the spectrum analyzer to the harmonic frequency and press marker peak search and delta marker. 4. Set the signal generator frequency to the fundamental frequency of the harmonic. 5. Using the delta marker, read the harmonic power level on the spectrum analyzer. The harmonic level should be ≤-55 dBc.
  • Page 78: Troubleshooting Non-Harmonic Spurious

    Troubleshooting Troubleshooting Non-Harmonic Spurious Troubleshooting Non-Harmonic Spurious There are nine different groupings a spur can fall into. The grouping determines what assembly is most likely generating the spur. The procedure for troubleshooting spurs is to identify the grouping based on failing a performance test, checking for loose or broken cables or castings, and replacing the assembly.
  • Page 79: Troubleshooting Option Unj Phase Noise

    Troubleshooting Troubleshooting Option UNJ Phase Noise Troubleshooting Option UNJ Phase Noise Poor grounds or shielding problems in either the test environment or the measurement system can cause the phase noise measurement to fail. Physical vibration is another common cause of phase noise. Before performing a phase nose measurement make sure all covers are installed, the work surface is free of physical vibrations, and the phase noise system is working properly.
  • Page 80 Reference / Synthesis Loop A9 YIG Driver Microwave / RF Path A26 Microwave Interface Deck FM Coil FM Driver 250 kHz 3.2 to 10 GHz 3.2 to 20 GHz A28 YIG 20 GHz A29 20 GHz Doubler A30 Modulator Filter A24 Coupler RF Output Oscillator...
  • Page 81: Overall Block Diagram

    Troubleshooting Overall Block Diagram 1-68...
  • Page 82: Overall Block Description

    Troubleshooting Overall Block Description Overall Block Description The objective of the overall block description is to provide a functional overview of the Performance Signal Generator (PSG). Some of the functional blocks discussed are common to many types of instruments while others are more specific to signal generators.
  • Page 83: Frequency Generation

    Troubleshooting Overall Block Description green Light Emitting Diodes (LED). When lit the amber LED indicates that line voltage is present and the signal generator is in standby mode. When lit the green LED indicates the signal generator is in the power-on mode.
  • Page 84 Troubleshooting Overall Block Description on the A8 Output by mixing down 1000-750 MHz with a 1 GHz LO from the A7 Reference. The signal (100 kHz - 3.2 GHz) is then routed to the A23 Low Band Coupler/Detector and then is merged into the high band path by a switch in the A30 Modulation Filter microcircuit.
  • Page 85 Troubleshooting Overall Block Description 1-72...
  • Page 86 A6 Frac-N (Fine Tune) H_FM_INV MOD_CONTROL A9 YIG Driver H_SD_FM L_SD_OFF V_GHZ_DAC FM_FREQ_COMP_L 1 MHz PM FM_GAIN_DAC FM_FREQ_COMP L_FM_OFF FM_OUT_ VSWP_DAC FM_FREQ_COMP_H 0.1 MHz PM ATTEN_ BAND_ CONTROL YTO_FM Source Settled Control Indicators SOURCE_SETTLED_H FM_ATTEN FM_ATTEN_L Coil FM_OFF_H A29 20 GHz Doubler Frac-N 230: :1k FM_ATTEN_H...
  • Page 87: Reference/Synthesis Loop Block Diagram

    Troubleshooting Reference/Synthesis Loop Block Diagram 1-74...
  • Page 88: Reference/Synthesis Loop Block Description

    Troubleshooting Reference/Synthesis Loop Block Description Reference/Synthesis Loop Block Description The function of the Reference/Synthesis Loop is to establish the frequency characteristics of the signal generator. These frequency characteristics are the fundamental frequency range, phase noise, and frequency accuracy. The Reference/Synthesis loop consists of the A7 Reference, A5 Sampler, A6 Frac-N, A9 YIG Driver, YIG Oscillator (YO), and A29 20 GHz Doubler.
  • Page 89: A6 Frac-N

    Troubleshooting Reference/Synthesis Loop Block Description A6 Frac-N One function of the A6 Frac-N is to provide a means to set the YIG Oscillator to any frequency. This is accomplished on the A6 Frac-N by using a dividing technique that can set the A6 Frac-N VCO signal to any frequency.
  • Page 90 A9 YIG Driver A26 Micro Interface Deck DBL40_LPF ATTEN DBL20_AMP_ON_H DBL40_BIAS V_GHZ_DAC FM_FREQ_COMP_L DBL40_PATH FM_GAIN_DAC FM_FREQ_COMP DBL20_PATH VSWP_DAC FM_FREQ_COMP_H DBL40_AMP A24 Coupler FM_ATTEN Coil A29 20 GHz Doubler A30 Modulator Filter A27 40 GHz Doubler A25 Detector FM_ATTEN_L 230: :1k MODF_PATH 800k 10-20...
  • Page 91: Rf Path Block Diagram

    Troubleshooting RF Path Block Diagram 1-78...
  • Page 92: Rf Path Block Description (Frequency Generation, Level Control, And Modulation)

    Troubleshooting RF Path Block Description (Frequency Generation, Level Control, and Modulation) RF Path Block Description (Frequency Generation, Level Control, and Modulation) Frequency Generation The RF is used to generate, modulate and control the level of the output frequencies. The Synthesis Loop Block Description describes how the fundamental frequencies of 3.2 GHz to 10 GHz are generated using the YO, Sampler, and Frac-N.
  • Page 93: A30 Modulation Filter

    Troubleshooting RF Path Block Description (Frequency Generation, Level Control, and Modulation) A30 Modulation Filter The A30 Modulation Filter’s frequency output is from 100 kHz to 20 GHz. Frequencies below 3.2 GHz are switched through the A30 Modulation Filter and are not filtered or modulated in the assembly. The A30 Modulation Filter provides level control, pulse modulation, amplitude modulation, and filtering for frequencies 3.2 GHz and above.
  • Page 94: Modulation (Am, Fm, Pm, And Pulse)

    Troubleshooting RF Path Block Description (Frequency Generation, Level Control, and Modulation) ALC ON operation is referred to as a closed loop operation because the output signal level is continually monitored and used to adjust the modulator drive resulting unleveled output power. In ALC OFF mode, the feedback path, the detected voltage path is opened and only the reference voltage is used to set the output power level.
  • Page 95: Self-Test Overview

    Troubleshooting Self-Test Overview Self-Test Overview Philosophy The philosophy of self-test is, “It is better to pass a defective signal generator than to fail a good signal generator. Self-tests are designed as a diagnostic tool used to check signal generator hardware. Self-tests do not require the signal generator to be calibrated before self-tests will pass.
  • Page 96 Troubleshooting Self-Test Overview • Run Selected Tests • When View Details is selected, the measured value, lower, and upper limits are displayed or the highlighted test. 1-83...
  • Page 97: Contacting Agilent Technologies

    If there is still a problem, read the warranty printed in Chapter 5. If your signal generator is covered by a separate maintenace agreement, be familiar with its terms. Agilent Technologies offers several maintenance plans to service your signal generator after warranty expiration. Call your Agilent Technologies sales and service office for full details.
  • Page 98: Contacting Agilent Sales And Service Offices

    Troubleshooting Contacting Agilent Technologies Contacting Agilent Sales and Service Offices Before contacting Agilent, read the warranty printed in Chapter 5. If your signal generator is covered under a main ten ace agreement, be familiar with its terms. Sales and service offices are located around the world to provide complete support for your signal generator.
  • Page 99: Returning Your Signal Generator For Service

    Contacting Agilent Technologies Returning Your Signal Generator for Service Use the information in this section if you need to return the signal generator to Agilent Technologies. Packaging the Signal Generator 1. Use the original packaging materials or a strong shipping container that is made of double-walled, corrugated cardboard with 159 kg (350 lb.) bursting strength.
  • Page 100: Assembly Replacement

    Assembly Replacement...
  • Page 101: Before You Replace An Assembly

    Assembly Replacement Before You Replace an Assembly Before You Replace an Assembly CAUTION Many of the assemblies in this instrument are very susceptible to damage from electrostatic discharge (ESD). Perform service procedures only at a static-safe workstation and wear a grounding strap. Be sure to review the warning and caution statements described in Chapter 55, "Safety and Regulatory,"...
  • Page 102: Assemblies That You Can Replace

    Assembly Replacement Assemblies That You Can Replace Assemblies That You Can Replace • "Outer Instrument Cover" on page 2-4 • "Inner Instrument Cover" on page 2-6 • "Front Panel" on page 2-8 • "A1 Keyboard" on page 2-10 • "A2 Display" on page 2-12 •...
  • Page 103: Outer Instrument Cover

    Assembly Replacement Outer Instrument Cover Outer Instrument Cover Tools Required • T-15 driver • T-20 driver Removal Procedure Refer to Figure 2-1 for this procedure. 1. Disconnect the power cord. 2. Using the T-20 driver, loosen and remove the two screws (1) and remove the strap handle (2). 3.
  • Page 104 Assembly Replacement Outer Instrument Cover Figure 2-1 Outer Instrument Cover Removal...
  • Page 105: Inner Instrument Cover

    Assembly Replacement Inner Instrument Cover Inner Instrument Cover Tools Required • T-10 driver Removal Procedure Refer to Figure 2-2 for this procedure. 1. Disconnect the power cord. 2. Remove the outer-cover from the signal generator. Refer to "Outer Instrument Cover" on page 2-4.
  • Page 106 Assembly Replacement Inner Instrument Cover Figure 2-2 Inner Instrument Cover Removal...
  • Page 107: Front Panel

    Assembly Replacement Front Panel Front Panel Tools Required • T-10 driver • T-15 driver • needle-nose pliers Removal Procedure Refer to Figure 2-3 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 108: Replacement Procedure

    Assembly Replacement Front Panel Replacement Procedure • Reverse the order of the removal procedure. • Torque all T-10 screws to 9 in-lbs. • Torque all T-15 screws to 21 in-lbs. • Perform the post-repair adjustments and performance tests that pertain to this removal procedure. Figure 2-3 Front Panel Removal...
  • Page 109: A1 Keyboard

    Assembly Replacement A1 Keyboard A1 Keyboard Tools Required • T-10 driver Removal Procedure Refer to Figure 2-4 for this procedure. 1. Disconnect the power cord. 2. Remove the front panel. Refer to "Front Panel" on page 2-8. 3. Disconnect the A2DS1W1 cable from the A4 Inverter. 4.
  • Page 110 Assembly Replacement A1 Keyboard Figure 2-4 A1 Keyboard Removal 2-11...
  • Page 111: A2 Display

    Assembly Replacement A2 Display A2 Display Tools Required • T-10 driver Removal Procedure Refer to Figure 2-5 for this procedure. 1. Disconnect the power cord. 2. Remove the front panel. Refer to "Front Panel" on page 2-8. 3. Disconnect the A2DS1W1 cable from the A4 Inverter. 4.
  • Page 112 Assembly Replacement A2 Display Figure 2-5 A2 Display Removal 2-13...
  • Page 113: A2Ds1 Display Backlight

    Assembly Replacement A2DS1 Display Backlight A2DS1 Display Backlight Tools Required • T-10 driver • small phillips screw driver Removal Procedure Refer to Figure 2-6. 1. Disconnect the power cord. 2. Remove the front panel. Refer to "Front Panel" on page 2-8.
  • Page 114 Assembly Replacement A2DS1 Display Backlight Figure 2-6 A2DS1 Display Backlight Removal 2-15...
  • Page 115: A3 Power Switch

    Assembly Replacement A3 Power Switch A3 Power Switch Tools Required • T-10 driver Removal Procedure Refer to Figure 2-7 for this procedure. 1. Disconnect the power cord. 2. Remove the front panel. Refer to "Front Panel" on page 2-8. 3. Disconnect the W8 ribbon cable from the A3 Power Switch by lifting the white tabs on the connector. 4.
  • Page 116 Assembly Replacement A3 Power Switch Figure 2-7 A3 Power Switch Removal 2-17...
  • Page 117: A4 Inverter

    Assembly Replacement A4 Inverter A4 Inverter Tools Required • none Removal Procedure Refer to Figure 2-8 for this procedure. 1. Disconnect the power cord. 2. Remove the front panel. Refer to "Front Panel" on page 2-8. 3. Disconnect the A4W1 cable from the A31 Motherboard P12. 4.
  • Page 118 Assembly Replacement A4 Inverter Figure 2-8 A4 Inverter Removal 2-19...
  • Page 119: A5 Sampler

    Assembly Replacement A5 Sampler A5 Sampler Tools Required • none Removal Procedure Refer to Figure 2-9 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 120 Assembly Replacement A5 Sampler Figure 2-9 A5 Sampler 2-21...
  • Page 121: A6 Frac-N

    Assembly Replacement A6 Frac-N A6 Frac-N Tools Required • none Removal Procedure Refer to Figure 2-10 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 122 Assembly Replacement A6 Frac-N Figure 2-10 A6 Frac-N 2-23...
  • Page 123: A7 Reference (Standard And Option Unj)

    Assembly Replacement A7 Reference (Standard and Option UNJ) A7 Reference (Standard and Option UNJ) Tools Required • none Removal Procedure Refer to Figure 2-11 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 124 Assembly Replacement A7 Reference (Standard and Option UNJ) Figure 2-11 A7 Reference 2-25...
  • Page 125: A8 Output

    Assembly Replacement A8 Output A8 Output Tools Required • none Removal Procedure Refer to Figure 2-12 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 126 Assembly Replacement A8 Output Figure 2-12 A8 Output 2-27...
  • Page 127: A9 Yig Driver

    Assembly Replacement A9 YIG Driver A9 YIG Driver Tools Required • needle-nose pliers Removal Procedure Refer to Figure 2-13 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 128 Assembly Replacement A9 YIG Driver Figure 2-13 A9 YIG Driver 2-29...
  • Page 129: A10 Alc

    Assembly Replacement A10 ALC A10 ALC Tools Required • needle-nose pliers Removal Procedure Refer to Figure 2-14 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 130 Assembly Replacement A10 ALC Figure 2-14 A10 ALC 2-31...
  • Page 131: A11 Pulse/Analog Modulation Generator

    Assembly Replacement A11 Pulse/Analog Modulation Generator A11 Pulse/Analog Modulation Generator Tools Required • needle-nose pliers Removal Procedure Refer to Figure 2-15 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 132 Assembly Replacement A11 Pulse/Analog Modulation Generator Figure 2-15 A11 Pulse/Analog Modulation Generator 2-33...
  • Page 133: A18 Cpu

    Assembly Replacement A18 CPU A18 CPU Tools Required • none Removal Procedure Refer to Figure 2-16 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 134 Assembly Replacement A18 CPU Figure 2-16 A18 CPU 2-35...
  • Page 135: A18Bt1

    Assembly Replacement A18BT1 A18BT1 WARNING This battery contains lithium. Do not incinerate or puncture this battery. Do not install this battery backwards. To dispose of the battery in a safe manner, refer to Chapter 5, "Lithium Battery Disposal," on page 5-4.
  • Page 136 Assembly Replacement A18BT1 Figure 2-17 A18BT1 2-37...
  • Page 137: A19 Power Supply

    Assembly Replacement A19 Power Supply A19 Power Supply Tools Required • T-10 driver • needle-nose pliers Removal Procedure Refer to Figure 2-18 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 138 Assembly Replacement A19 Power Supply Figure 2-18 A19 Power Supply Removal 2-39...
  • Page 139: Rear Panel

    Assembly Replacement Rear Panel Rear Panel Tools Required • T-10 driver • needle-nose pliers Removal Procedure Refer to Figure 2-19 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 140 Assembly Replacement Rear Panel Figure 2-19 Rear Panel Removal 2-41...
  • Page 141: A20 Smi (Source Module Interface)

    Assembly Replacement A20 SMI (Source Module Interface) A20 SMI (Source Module Interface) Tools Required • 5.0 mm hex-nut driver • needle-nose pliers Removal Procedure Refer to Figure 2-20 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 142 Assembly Replacement A20 SMI (Source Module Interface) Figure 2-20 A20 SMI 2-43...
  • Page 143: A21 Rear-Panel Interface

    Assembly Replacement A21 Rear-Panel Interface A21 Rear-Panel Interface Tools Required • T-10 driver • 9/16” hex-nut driver • 5.0 mm hex-nut driver • 7.0 mm hex-nut driver • needle-nose pliers Removal Procedure Refer to Figure 2-21 for this procedure. 1. Disconnect the power cord. 2.
  • Page 144 Assembly Replacement A21 Rear-Panel Interface Figure 2-21 A21 Rear-Panel Interface 2-45...
  • Page 145: A22 Line Module

    Assembly Replacement A22 Line Module A22 Line Module Tools Required • T-10 driver • 5.0 mm wrench • needle-nose pliers Removal Procedure Refer to Figure 2-22 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 146 Assembly Replacement A22 Line Module Figure 2-22 A22 Line Module Removal 2-47...
  • Page 147: At1 115 Db Attenuator (Option 1E1)

    Assembly Replacement AT1 115 dB Attenuator (Option 1E1) AT1 115 dB Attenuator (Option 1E1) Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-23 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 148 Assembly Replacement AT1 115 dB Attenuator (Option 1E1) Figure 2-23 AT1 115 dB Attenuator (Option 1E1) 2-49...
  • Page 149: A23 Low Band Coupler/Detector

    Assembly Replacement A23 Low Band Coupler/Detector A23 Low Band Coupler/Detector Tools Required • T-10 driver • 5/16” open ended wrench • wire cutters Removal Procedure Refer to Figure 2-24 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 150 Assembly Replacement A23 Low Band Coupler/Detector Figure 2-24 A23 Low Band Coupler/Detector 2-51...
  • Page 151: A24 20 Ghz High Band Coupler (E8241A And E8251A Models Only)

    Assembly Replacement A24 20 GHz High Band Coupler (E8241A and E8251A Models Only) A24 20 GHz High Band Coupler (E8241A and E8251A Models Only) Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-25 for this procedure. 1.
  • Page 152 Assembly Replacement A24 20 GHz High Band Coupler (E8241A and E8251A Models Only) Figure 2-25 A24 20 GHz High Band Coupler 2-53...
  • Page 153: A24 40 Ghz High Band Coupler (E8244A And E8254A Models Only)

    Assembly Replacement A24 40 GHz High Band Coupler (E8244A and E8254A Models Only) A24 40 GHz High Band Coupler (E8244A and E8254A Models Only) Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-26 for this procedure. 1.
  • Page 154 Assembly Replacement A24 40 GHz High Band Coupler (E8244A and E8254A Models Only) Figure 2-26 A24 40 GHz High Band Coupler 2-55...
  • Page 155: A25 20 Ghz High Band Detector With A25B Detector Bias Board (E8241A And E8251A Models Only)

    Assembly Replacement A25 20 GHz High Band Detector with A25B Detector Bias Board (E8241A and E8251A Models Only) A25 20 GHz High Band Detector with A25B Detector Bias Board (E8241A and E8251A Models Only) Tools Required • T-8 driver • T-10 driver •...
  • Page 156 Assembly Replacement A25 20 GHz High Band Detector with A25B Detector Bias Board (E8241A and E8251A Models Only) Figure 2-27 A25 20 GHz High Band Detector with Bias Board 2-57...
  • Page 157: A25 40 Ghz High Band Detector With A25B Detector Bias Board (E8244A And E8254A Models Only)

    Assembly Replacement A25 40 GHz High Band Detector with A25B Detector Bias Board (E8244A and E8254A Models Only) A25 40 GHz High Band Detector with A25B Detector Bias Board (E8244A and E8254A Models Only) Tools Required • T-8 driver • T-10 driver •...
  • Page 158 Assembly Replacement A25 40 GHz High Band Detector with A25B Detector Bias Board (E8244A and E8254A Models Only) Figure 2-28 A25 40 GHz High Band Detector with Bias Board 2-59...
  • Page 159: A26 Mid (Microcircuit Interface Deck)

    Assembly Replacement A26 MID (Microcircuit Interface Deck) A26 MID (Microcircuit Interface Deck) Tools Required • T-10 driver Removal Procedure Refer to Figure 2-29 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 160 Assembly Replacement A26 MID (Microcircuit Interface Deck) Figure 2-29 A26 MID 2-61...
  • Page 161: A27 40 Ghz Doubler (E8244A And E8254A Models Only)

    Assembly Replacement A27 40 GHz Doubler (E8244A and E8254A Models Only) A27 40 GHz Doubler (E8244A and E8254A Models Only) Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-30 for this procedure. 1. Disconnect the power cord. 2.
  • Page 162 Assembly Replacement A27 40 GHz Doubler (E8244A and E8254A Models Only) Figure 2-30 A27 40 GHz Doubler 2-63...
  • Page 163: A28 Yig Oscillator

    Assembly Replacement A28 YIG Oscillator A28 YIG Oscillator Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-31 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 164 Assembly Replacement A28 YIG Oscillator Figure 2-31 A28 YIG Oscillator 2-65...
  • Page 165: A29 20 Ghz Doubler

    Assembly Replacement A29 20 GHz Doubler A29 20 GHz Doubler Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-32 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 166 Assembly Replacement A29 20 GHz Doubler Figure 2-32 A29 20 GHz Doubler 2-67...
  • Page 167: A30 Modulation Filter (Standard And Option 1Ea)

    Assembly Replacement A30 Modulation Filter (Standard and Option 1EA) A30 Modulation Filter (Standard and Option 1EA) Tools Required • T-10 driver • 5/16” open ended wrench Removal Procedure Refer to Figure 2-33 for this procedure. 1. Disconnect the power cord. 2.
  • Page 168 Assembly Replacement A30 Modulation Filter (Standard and Option 1EA) Figure 2-33 A30 Modulator Filter 2-69...
  • Page 169: A31 Motherboard

    Assembly Replacement A31 Motherboard A31 Motherboard Tools Required • T-10 driver • 5/16” open ended wrench • needle-nose plier Removal Procedure Refer to Figure 2-34 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 170 Assembly Replacement A31 Motherboard Figure 2-34 A31 Motherboard 2-71...
  • Page 171: A32 10 Mhz Crystal Oscillator (Option Unj)

    Assembly Replacement A32 10 MHz Crystal Oscillator (Option UNJ) A32 10 MHz Crystal Oscillator (Option UNJ) Tools Required • T-10 driver • needle-nose plier Removal Procedure Refer to Figure 2-35 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover"...
  • Page 172 Assembly Replacement A32 10 MHz Crystal Oscillator (Option UNJ) Figure 2-35 A32 Crystal Oscillator 2-73...
  • Page 173: B1 Fan

    Assembly Replacement B1 Fan B1 Fan Tools Required • T-10 driver Removal Procedure Refer to Figure 2-36 for this procedure. 1. Disconnect the power cord. 2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-4 "Inner Instrument Cover"...
  • Page 174 Assembly Replacement B1 Fan Figure 2-36 B1 Fan 2-75...
  • Page 175 Assembly Replacement B1 Fan 2-76...
  • Page 176 Replaceable Parts...
  • Page 177: Replaceable Parts Ordering Information

    1. Determine the part number. 2. Determine the quantity required. 3. Mail this information to the nearest Agilent Technologies office or, in the U.S., call the hotline number listed in the following section. To order a part not listed in the replaceable parts lists, mail the following information to the nearest Agilent Technologies office or, in the United States, call the hotline number listed in the following section.
  • Page 178: Save Money With Rebuilt-Exchange Assemblies

    Replaceable Parts Save Money with Rebuilt-Exchange Assemblies Save Money with Rebuilt-Exchange Assemblies Under the rebuilt-exchange assembly program, certain factory-repaired and tested assemblies are available on a trade-in basis. These assemblies cost less than a new assembly, and meet all factory specifications required of a new assembly.
  • Page 179: Shipping The Defective Assembly Back To Agilent Technologies

    If you are inside the United States, stick the pre-printed return address label over the label that is already on the box and return the box to Agilent Technologies. (Agilent Technologies pays postage on boxes mailed within the United States.) If you are outside the United States, do not use the return address label;...
  • Page 180: Abbreviations Used In Part Descriptions

    Replaceable Parts Abbreviations Used in Part Descriptions Abbreviations Used in Part Descriptions This section defines the reference designators, and abbreviations, and option numbers that are used in the part descriptions throughout this chapter. Reference Description Designator assembly attenuator battery central processing unit conical washer (screws) lamp flathead (screws)
  • Page 181: Major Assemblies

    Replaceable Parts Major Assemblies Major Assemblies This section lists the major assemblies in the signal generator. • A1 Keyboard page 3-10 • A2 Display page 3-10 • A2DS1 Backlight page 3-10 • A3 Power Switch page 3-10 • A4 Inverter page 3-10 •...
  • Page 182: Major Assemblies Top View

    Replaceable Parts Major Assemblies Major Assemblies Top View This section shows the major assemblies of the signal generator from the top view.
  • Page 183: Major Assemblies Bottom View

    Replaceable Parts Major Assemblies Major Assemblies Bottom View This section shows the major assemblies of the signal generator from the bottom view.
  • Page 184: Major Assemblies Microcircuit Deck View

    Replaceable Parts Major Assemblies Major Assemblies Microcircuit Deck View This section shows the major assemblies of the signal generator’s microcircuit deck.
  • Page 185: Inside Front Panel View

    Replaceable Parts Major Assemblies Inside Front Panel View Table 3-1 Inside Front Panel View Reference Description Part Number Designator Keyboard E8251-60058 Display 2090-0375 A2DS1 Backlight 1513-5204 Power Switch E8251-60042 Inverter 0950-3757 3-10...
  • Page 186 Replaceable Parts Major Assemblies Figure 3-1 Inside Front Panel View 3-11...
  • Page 187: Main Chassis Top View

    Replaceable Parts Major Assemblies Main Chassis Top View Table 3-2 Main Chassis Top View Reference Description Part Number Designator Sampler E8251-60043 Frac-N E8251-60044 Reference E4423-60018 Reference (Option UNJ) E8251-60048 Output E8251-60046 YIG Driver E8251-60007 E8251-60005 Pulse/Analog Modulation Generator (E8251A and E8254A Models Only) E8251-60011 E8251-60006 Power Supply...
  • Page 188 Replaceable Parts Major Assemblies Figure 3-2 Main Chassis Top View 3-13...
  • Page 189: Main Chassis Bottom View

    Replaceable Parts Major Assemblies Main Chassis Bottom View Table 3-3 Main Chassis Bottom View Reference Description Part Number Designator Motherboard E8251-60004 3-14...
  • Page 190 Replaceable Parts Major Assemblies Figure 3-3 Main Chassis Bottom View 3-15...
  • Page 191: Inside Rear Panel View

    Replaceable Parts Major Assemblies Inside Rear Panel View Table 3-4 Inside Rear Panel View Reference Description Part Number Designator 3160-4121 SMI (Source Module Interface) E8251-60072 Rear-Panel Interface E8251-60013 Line Module 5064-5053 10 MHz Crystal Oscillator (Option UNJ) E8251-60071 Figure 3-4 Inside Rear Panel View 3-16...
  • Page 192: Microcircuit Interface Deck Top View

    Replaceable Parts Major Assemblies Microcircuit Interface Deck Top View Table 3-5 Microcircuit Interface Deck Top View Reference Description Part Number Designator 115 dB Attenuator (Option 1E1) E8251-60070 Low Band Coupler/Detector E8251-60021 40 GHz High Band Coupler (E8244A and E8254A 250 kHz to 40 GHz Models Only) 0955-1136 20 GHz High Band Coupler (E8241A and E8251A 250 kHz to 20 GHz Models Only) not shown 0955-0148...
  • Page 193: Mid Bottom View

    Replaceable Parts Major Assemblies MID Bottom View Table 3-6 MID Bottom View Reference Description Part Number Designator YIG Oscillator 5087-7113 20 GHz Doubler 5087-7058 Modulator Filter with Standard Power 5087-7060 Modulator Filter with High Power (Option 1EA) 5087-7061 3-18...
  • Page 194 Replaceable Parts Major Assemblies Figure 3-6 MID Bottom View 3-19...
  • Page 195: Battery-Lithium

    Replaceable Parts Major Assemblies Battery-Lithium Table 3-7 Battery-Lithium Reference Description Part Number Designator A18BT1 Battery-Lithium 1420-0314 Figure 3-7 Battery-Lithium 3-20...
  • Page 196: Cables

    Replaceable Parts Cables Cables This section lists part numbers for the cables in your signal generator. • “Inside Front Panel View” on page 3-22 • “Main Chassis Top View” on page 3-24 • “Rear Panel View” on page 3-26 • “MID Top View (E8244A and E8254A Models Only)”...
  • Page 197: Inside Front Panel View

    Replaceable Parts Cables Inside Front Panel View Table 3-8 Inside Front Panel View Reference Description Part Number Designator Wire Cable, A4 Inverter to P12 of A31 Motherboard (part of A4) A4W1 A2DS1W1 * Wire Cable, A2DS1 to A4 Inverter (part of A2) A1W1 * Ribbon Cable, A1 Keyboard to P13 of A31 Motherboard (part of A1)
  • Page 198 Replaceable Parts Cables Figure 3-8 Inside Front Panel View 3-23...
  • Page 199: Main Chassis Top View

    Replaceable Parts Cables Main Chassis Top View Table 3-9 Main Chassis Top View Reference Description Part Number Designator Flexible Cable, EXT 1 to J401 of A11 Pulse/Analog Modulation Generator 8121-0628 Flexible Cable, EXT 2 to J402 of A11 Pulse/Analog Modulation Generator 8121-0628 Flexible Cable, LF OUTPUT to J403 of A11 Pulse/Analog Modulation Generator 8121-0628...
  • Page 200 Replaceable Parts Cables Figure 3-9 Main Chassis Top View 3-25...
  • Page 201: Rear Panel View

    Replaceable Parts Cables Rear Panel View Table 3-10 Rear Panel View Reference Description Part Number Designator A22 Line Module to A19 Power Supply (part of A22) A22W1 A22W2 * A22 Line Module to chassis ground post on rear-panel (part of A22) A32W1 * Wire Cable, A32 Crystal Oscillator to P2 of A21 Rear-Panel Interface Option UNJ (part of A32)
  • Page 202 Replaceable Parts Cables Figure 3-10 Rear Panel View 3-27...
  • Page 203: Mid Top View (E8244A And E8254A Models Only)

    Replaceable Parts Cables MID Top View (E8244A and E8254A Models Only) Table 3-11 MID Top View (E8244A and E8254A Models Only) Reference Description Part Number Designator Wire Cable, A25B High Band Detector Bias board to J12 of A26 MID (part of A25) A25BW1 Semi-Rigid Cable, A24 High Band Coupler output to AT1 input Option 1E1 E8251-20025...
  • Page 204 Replaceable Parts Cables Figure 3-11 MID Top View (E8244A and E8254A Models Only) 3-29...
  • Page 205: Mid Top View (E8241A And E8251A Models Only)

    Replaceable Parts Cables MID Top View (E8241A and E8251A Models Only) Table 3-12 MID Top View (E8241A and E8251A Models Only) Reference Description Part Number Designator Wire Cable, A25B High Band Detector Bias Board to J12 of A26 MID (part of A25) A25BW1 Semi-Rigid Cable, A24 20 GHz High Band Coupler Output to AT1 Input Option 1E1 E8251-20026...
  • Page 206 Replaceable Parts Cables Figure 3-12 MID Top View (E8241A and E8251A Models Only) 3-31...
  • Page 207: Mid Bottom View

    Replaceable Parts Cables MID Bottom View Table 3-13 MID Bottom View Reference Description Part Number Designator Ribbon Cable, AT1 to J13 of A26 MID Option 1E1 5062-6646 Semi-Rigid Cable, A23 Low Band Coupler/Detector to A31 Motherboard (Output) E8251-20020 Semi-Rigid Cable, A28 YIG Oscillator to J1 of A29 20 GHz Doubler E8251-20014 Semi-Rigid Cable, J4 of A29 20 GHz Doubler to A31 Motherboard (Sampler) E8251-20015...
  • Page 208 Replaceable Parts Cables Figure 3-13 MID Bottom View 3-33...
  • Page 209: Main Chassis Bottom View

    Replaceable Parts Cables Main Chassis Bottom View Table 3-14 Main Chassis Bottom View Reference Description Part Number Designator Semi-Rigid Cable, A31 Motherboard (Sampler) to Motherboard (Reference) E8251-20030 Semi-Rigid Cable, A31 Motherboard (Frac-N) to A31 Motherboard (Output) E8251-20030 Flexible Cable, J1051 of A31 Motherboard to J1122 of A31 Motherboard 8121-0620 Flexible Cable, J1055 of A31 Motherboard to J1121 of A31 Motherboard 8121-0620...
  • Page 210 Replaceable Parts Cables Figure 3-14 Main Chassis Bottom View 3-35...
  • Page 211: Hardware And Other Instrument Parts

    Replaceable Parts Hardware and Other Instrument Parts Hardware and Other Instrument Parts This section lists part numbers for hardware and other instrument parts in your signal generator. • “Front Panel View” on page 3-37 • “Disassembled Front Panel View” on page 3-38 •...
  • Page 212: Front Panel View

    Replaceable Parts Hardware and Other Instrument Parts Front Panel View Table 3-15 Front Panel View Item No. Description Part Number Small Overlay E8251-80011 Nameplate - E8241A 250 kHz - 20 GHz CW E8251-80010 Nameplate - E8244A 250 kHz - 20 GHz Analog E8251-80011 Nameplate - E8251A 250 kHz - 40 GHz CW E8251-80012...
  • Page 213: Disassembled Front Panel View

    Replaceable Parts Hardware and Other Instrument Parts Disassembled Front Panel View Table 3-16 Disassembled Front Panel View Item No. Description Part Number Front Panel Frame E8251-20102 Gasket RFI Round Mesh .125 inch 8160-0660 Gasket RFI Round Mesh .062 inch 8160-0723 Velcro Attachment 0510-1303 Glass Filter 70% Xmt...
  • Page 214 Replaceable Parts Hardware and Other Instrument Parts Figure 3-16 Disassembled Front Panel View 3-39...
  • Page 215: Disassembled Rear Panel View

    Replaceable Parts Hardware and Other Instrument Parts Disassembled Rear Panel View Table 3-17 Disassembled Rear Panel View Item No. Description Part Number Rear Panel E8251-00005 Screw-Machine M3.0 8 CW-PN-TX (mounting screws for rear-panel and rear struts) 0515-0372 Screw-Machine M3.0 14CW-PN-TX (screw to mount B1 fan to rear-panel) 0515-0665 Beveled Washer (fan) 3050-1628...
  • Page 216 Replaceable Parts Hardware and Other Instrument Parts Figure 3-17 Disassembled Rear Panel View 3-41...
  • Page 217: Disassembled A32 10 Mhz Crystal Oscillator (Option Unj)

    Replaceable Parts Hardware and Other Instrument Parts Disassembled A32 10 MHz Crystal Oscillator (Option UNJ) Table 3-18 Disassembled A32 10 MHz Crystal Oscillator (Option UNJ) Item No. Description Part Number C-Bracket E8251-00040 Shock Mount 1520-0205 Flathead Washer 3050-0105 Screw-Machine 4.0 x 40 .250 2200-0103 L-Bracket E8251-00041...
  • Page 218: Disassembled At1 115 Db Attenuator View (Option 1E1)

    Replaceable Parts Hardware and Other Instrument Parts Disassembled AT1 115 dB Attenuator View (Option 1E1) Table 3-19 Disassembled AT1 115 dB Attenuator View (Option 1E1) Reference Description Part Number Designator Bracket E8251-00038 Screw-Machine M3.0 x 8 FL-TX 0515-1035 Figure 3-19 Disassembled AT1 115 dB Attenuator View (Option 1E1) 3-43...
  • Page 219: Disassembled A29 20 Ghz Coupler/Detector (E8241A And E8251A Models Only)

    Replaceable Parts Hardware and Other Instrument Parts Disassembled A29 20 GHz Coupler/Detector (E8241A and E8251A Models Only) Table 3-20 Disassembled A29 20 GHz Coupler/Detector (E8241A and E82541 Models Only) Item No. Description Part Number Coupler Bracket E8251-00039 Washer Lock M2.0 2190-0654 Screw-Machine SM 256 .250 PN-PN 0520-0128...
  • Page 220: Disassembled A24 High Band Coupler And A25 High Band Detector (E8244A And E8254A Models Only)

    Replaceable Parts Hardware and Other Instrument Parts Disassembled A24 High Band Coupler and A25 High Band Detector (E8244A and E8254A Models Only) Table 3-21 Disassembled A24 High Band Coupler and A25 High Band Detector (E8244A and E8254A Models Only) Item No. Description Part Number Coupler Bracket...
  • Page 221: Microcircuit Interface Deck Top View

    Replaceable Parts Hardware and Other Instrument Parts Microcircuit Interface Deck Top View Table 3-22 Microcircuit Interface Deck Top View Item No. Description Part Number Screw-Machine M3.0 x 14 CW-PN-TX 0515-0665 3-46...
  • Page 222 Replaceable Parts Hardware and Other Instrument Parts Figure 3-22 Microcircuit Interface Deck Top View 3-47...
  • Page 223: Main Chassis And Mid Bottom View

    Replaceable Parts Hardware and Other Instrument Parts Main Chassis and MID Bottom View Table 3-23 Main Chassis and MID Bottom View Item No. Description Part Number Rib Bracket E8251-00008 Cable Retainer Clip E8251-40001 Screw-Machine M30. x 8 CW-PN-TX (A31 Motherboard to main chassis) 0515-0372 Screw-Machine M30.
  • Page 224 Replaceable Parts Hardware and Other Instrument Parts Figure 3-23 Main Chassis and MID Bottom View 3-49...
  • Page 225: Mm Rf Output Connector (E8244A And E8254A Models Only)

    Replaceable Parts Hardware and Other Instrument Parts 2.4 mm RF Output Connector (E8244A and E8254A Models Only) Table 3-24 2.4 mm RF Output Connector (E8244A and E8254A Model Only) Item No. Description Part Number Adapter-Male 2.4 mm 5063-1700 Adapter Bracket E8251-00018 Screw-Machine M4.0 x 10 FL-TX (front frame to adapter bracket) 0515-1269...
  • Page 226: Apc 3.5 Rf Output Connector (E8241A And E8251A Models Only)

    Replaceable Parts Hardware and Other Instrument Parts APC 3.5 RF Output Connector (E8241A and E8251A Models Only) Table 3-25 APC 3.5 RF Output Connector (E8241A and E8251A Models Only) Item No. Description Part Number Adapter-Male APC 3.5 08673-60040 Spacer APC 3.5 E8251-20068 Adapter Bracket E8251-00016...
  • Page 227: Type-N Rf Output Connector (E8241A And E8251A With Option 1Ed Models Only)

    Replaceable Parts Hardware and Other Instrument Parts Type-N RF Output Connector (E8241A and E8251A with Option 1ED Models Only) Table 3-26 Type-N RF Output Connector (E8241A and E8251A with Option 1ED Models Only) Item No. Description Part Number Adapter-Type-N (f) 08559-60002 Spacer E8251-20067...
  • Page 228: Main Chassis With Inside Cover And Right-Side Support Wall

    Replaceable Parts Hardware and Other Instrument Parts Main Chassis with Inside Cover and Right-Side Support Wall Table 3-27 Main Chassis with Inside Cover and Right-Side Support Wall Item No. Description Part Number Main Chassis Inside Top Cover E8251-00010 Screw-Machine M3.0 x 08 FL-TX (inside top cover to main chassis and rear panel) 0515-0431 Screw-Machine M3.0 x 08 CW-PN-TX (rear panel to right-side support wall) 0515-0372...
  • Page 229: Outer And Inner Instrument Covers And Associated Parts

    Replaceable Parts Hardware and Other Instrument Parts Outer and Inner Instrument Covers and Associated Parts Table 3-28 Outer and Inner Instrument Covers and Associated Parts Item No. Description Part Number Assy-Strap Handle - includes the following parts: E8251-60067 Strap Assembly Ground Spring Handle Retainer End Cap...
  • Page 230: Miscellaneous

    Replaceable Parts Miscellaneous Miscellaneous This section lists part numbers for miscellaneous items that can be used with your signal generator. 3-55...
  • Page 231: Accessories

    Replaceable Parts Miscellaneous Accessories Table 3-29 Accessories Description Part Number Test Cable E8251-20088 Documentation Table 3-30 Available PSG Documentation Document Type Description Part Number PSG Document Set • E8251-90020 user’s, programming, calibration, and service guides • error messages Documentation CD-ROM •...
  • Page 232 Replaceable Parts Miscellaneous Table 3-31 Electrostatic Discharge (ESD) Protective Supplies Description Part Number ESD connector end cap coherent carrier cut 1252-4696 2 X 4 Ft. Antistatic Table Mat with 15 FT. Ground Wire 9300-0797 5 Ft. Grounding Cord (for wrist strap) 9300-0980 Adjustable Antistatic Wrist Strap 9300-1367...
  • Page 233 Replaceable Parts Miscellaneous 3-58...
  • Page 234: Post-Repair Procedures

    Post-Repair Procedures...
  • Page 235: Post-Repair Procedures Matrix

    Post-Repair Procedures Post-Repair Procedures Matrix Post-Repair Procedures Matrix Table 4-1 Adjustments for Assemblies A1 through A20 Adjustments Replaced Assembly The following adjustments are listed in the order that they should be performed for proper calibration. ADC Calibration YIG-Driver Pre-Tune Calibration VCO Bias Frac-N Calibration Internal Source Calibration AM Audio Path Offset Calibration...
  • Page 236 Post-Repair Procedures Post-Repair Procedures Matrix Table 4-2 Adjustments for Assemblies A21 through A32, B1, and RF Output Connector Adjustments Replaced Assembly The following adjustments are listed in the order that they should be performed for proper calibration. ADC Calibration YIG-Driver Pre-Tune Calibration VCO Bias Frac-N Calibration Internal Source Calibration AM Audio Path Offset Calibration...
  • Page 237 Post-Repair Procedures Post-Repair Procedures Matrix Table 4-3 Performance Tests for Assemblies A1 through A20 Performance Tests Replaced Assembly The following performance tests are listed in the order that they should be performed to minimize changes in test equipment configurations. Self Tests Maximum Leveled Output Power Power Level Accuracy Internal Pulse Modulation Level Accuracy...
  • Page 238 Post-Repair Procedures Post-Repair Procedures Matrix Table 4-4 Performance Tests for Assemblies A21 through A32, B1, and RF Output Connector Performance Tests Replaced Assembly The following performance tests are listed in the order that they should be performed to minimize changes in test equipment configurations.
  • Page 239 Post-Repair Procedures Post-Repair Procedures Matrix...
  • Page 240: Safety And Regulatory

    Safety and Regulatory...
  • Page 241 Safety and Regulatory Safety and Regulatory Safety and Regulatory This chapter provides information on the following: • Safety Notes • General Safety Information • Lithium Battery Disposal • Warranty and Legal Information The following safety notes are used throughout this manual. Familiarize yourself with each of the notes and its meaning before operating this instrument.
  • Page 242: General Safety Considerations

    Safety and Regulatory General Safety Considerations General Safety Considerations The following safety notes apply specifically to signal generators. These notes also appear in other chapters of this service guide as required. These servicing instructions are for use by qualified personal only. To avoid WARNING electrical shock, do not perform any servicing unless you are qualified to do so.
  • Page 243: Lithium Battery Disposal

    Lithium Battery Disposal When the battery on the A14 CPU is exhausted and/or ready for disposal, dispose of it according to your country’s requirements. You can return the battery to your nearest Agilent Technologies Sales and Service office for disposal, if required.
  • Page 244: Warranty

    This Agilent Technologies product is warranted against defects in material and workmanship for a period of three years from date of shipment. During the warranty period, Agilent Technologies will, at its option, either repair or replace products which prove to be defective.
  • Page 245: Assistance

    Safety and Regulatory Assistance Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products. For any assistance, contact your nearest Agilent Technologies sales and service office.
  • Page 246: Notice

    The information contained in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
  • Page 247: Certification

    Certification Certification Agilent Technologies Company certifies that this product met its published specifications at the time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of other International Standards Organization...
  • Page 248 Index A26 microcircuit interface deck (MID) part number 3-17 A1 keyboard removal replacement 2-60 part number 3-10 A27 40 GHz doubler removal replacement 2-10 Option 1EA 3-17 A10 ALC removal replacement 2-62 part number 3-12 standard power 3-17 removal replacement 2-30 A28 YIG oscillator A11 pulse/analog modulation generator...
  • Page 249 2-46 contacting agilent A23 lowband coupler/detector 2-50 packaging your signal generator 1-85 A24 20 GHz coupler (E8241A/E8251A models only) contacting Agilent Technologies 2-52 returning your signal generator 1-86 A24 40 GHz coupler (E8244A/E8254A models only) servicing your signal generator 1-86...
  • Page 250 Index rear panel removal replacement 2-40 replaceable assemblies replaceable parts cables 3-21 hardware and other instrument parts 3-36 list of major assemblies major assemblies bottom view major assemblies microcircuit interface deck view major assemblies top view ordering information replacement front panel subassemblies illustrated 2-13 2-15...
  • Page 251 Index Index...

This manual is also suitable for:

E8241aE8244aE8251aE8254a

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