A21 Ocxo, Synthesizer Section | Agilent Technologies 856290216

A21 OCXO

The spectrum analyzer uses an oven-controlled crystal oscillator (OCXO). It is deleted in Option 103 and replaced by a temperature-compensated crystal oscillator (TCXO), located on the Al5 RF assembly. Connectors J305 and J306 on the Al5 RF assembly are located where the TCXO would be installed in an Option 103. The oven in the OCXO is powered only when the spectrum analyzer is powered on; there is no standby mode of operation. The OCXO oscillator operates only when the internal frequency reference is selected. Control line HEXT (High = EXTernal frequency reference) is inverted by A15U303B to generate LEXT. (Refer to the Al5 RF assembly schematic diagram, block M, sheet 2 of 4.) LEXT is sent to the OCXO via A15J306 pin 4. When LEXT is low, the oscillator in the OCXO will be turned off.

Replacement OCXOs are factory adjusted after a complete warmup and after the specified aging rate has been achieved. Thus, readjustment should typically not be necessary after OCXO replacement, and is generally not recommended.

If adjustment is necessary, the spectrum analyzer must be on continuously for a minimum of 24 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize. Failure to allow sufficient stabilization time could result in oscillator misadjustment.

Check operation of the A21 OCXO as follows:

1.Disconnect W49 (Coax 82) from A15J305. Connect the output of W49 to the input of another spectrum analyzer.

2.Check that the fundamental frequency is 10 MHz and that the power level is 0 dBm

f3 dB. Also check that the harmonics are at least -25 dBc. Excessive harmonics can generate spurious responses on the fractional N oscillator on the Al4 frequency control assembly.

3.If the OCXO has no output, check A15J306 pin 1 for +15 Vdc. Check A15J306 pin 4 for a TTL-high level.

4.If A15J306 pin 4 is at a TTL-low level, press (mCTRL) and REAR Pa= . Press

10 MHz EXT INT until INT is underlined. A15J306 pin 4 should read a TTL-high level.

Press 10 MHz EXT 31T until EXT is underlined. A15J306 pin 4 should read a TTL-low level.

1 l-50 Synthesizer Section

Image 424

Agilent Technologies 856290216 service manual A21 Ocxo, Synthesizer Section

Contents

About this Manual Fia Hewlett HP Part No -90218 SupersedesPage Certification WarrantyRegulatory Information Safety Notes Assistance General Safety Considerations Prevent electrical shock, do not remove covers Documentation Outline How to Use This GuideThis guide uses the following conventions Contents Contents-2 Contents-3 Contents-4 Contents-5 Contents-6 Contents-7 Controller Section Contents-9 Contents-10 Figures Contents-12 Contents-13 Contents-14 Contents-15 Tables PLL Serial Number Label Example Serial Numbers and Repair InformationGeneral Information l-1 Instrument Variations Table l- 1. Instrument VariationsGeneral Information A21 Ocxo HP 85629B Test and Adjustment Module General Information l-3 Table l-2. Service Kit Contents Service KitElectrostatic Discharge Reducing Potential for ESD Damage General Information l-5 Returning Instruments for Service Static-Safe AccessoriesService Tag Static-Safe Accessories Other Packaging 9211-6969 Outer Carton 9220-5073 Pads 9220-5072 Top Tray Recommended Test Equipment General Information l-9 Table l-4. Recommended Test Equipment Instrument Sources Recommended Test Equipment General Information l-l Instrument Critical Specifications Recommended Use Instrument Accessories PAV PAM Sales and Service Offices Hewlett-Packard Sales and Service Offices US Field Operations Adjustment Procedures Introduction Safety Considerations Which Adjustments Should Be Performed?Adjustable and Factory-Selected Components Test Equipment Instrument Service Position Adjustment Tools8710-0033 Related Adjustments A5 if A10 Rythm Adjustable Components HV ADJ FM SpanSmpl Match VCO Range Factory Selected Components Using the TAM Adjustment Indicator TAM Adjustments YTO Adjustment Procedures 2-l Required Test Equipment for TAM Front End Cal adjustment High Voltage Power Supply Adjustment Assembly AdjustedHigh Voltage Power Supply Adjustment Related Performance Test Procedure Equipment Display Adjustment Display Adjustment Cutoff Adjustment Preliminary AdjustmentsDeflection Adjustments CRT Adjust Pattern Adjustment Procedures Intensity Adjustments Fast Zero Span Adjustments A2 Display Adjustment Locations Press SAVEI, Save State ,and State If Bandpass Adjustment If Bandpass Adjustment LC Bandpass Adjustments TAM Connector Pin Locations Xtal Bandpass Adjustments Factory-Selected LC Filter Capacitors Factory-Selected Xtal Filter Capacitors Xtal Factory-Selected Capacitor SelectionA5T200 Xtal CTR A5T202 Xtal CTR If Bandpass Adjustment 10. Capacitor Part Numbers If Amplitude Adjustments Related Performance Tests If Amplitude Adjustments If Amplitude Adjustment Locations A5 Reference Attenuator Adjustment A5 Adjustment Verification DC Log Amplifier Adjustments DC Log Adjustment Setup Adjustment Procedures A4 Limiter Phase Adjustment DC Log Amplifier Adjustments A4 Linear Fidelity Adjustment Log Amplifier Adjustments A4 LOG Fidelity Adjustment Press -,a, if AlI on OFF OFF, AD3 Curr if State Sampling Oscillator Adjustment 11. Sampler Adjustment Setup Sampler Match Adjustment Sampling Oscillator AdjustmentSampling Oscillator Adjustment Sampling Oscillator Adjustment 1. Sampling Adjustments YTO Adjustment YTO Adjustment YTO Main Coil Adjustments 07SAVE Save STATE, State RECALL, Recall STATE, State YTO FM Coil Adjustments 14. YTO Adjustment Locations LO Distribution Amplifier Adjustment 15. First LO Distribution Amplifier Adjustment Setup LO Distribution Amplifier Adjustment 18. TAM Connector Pin Locations DAC value for 4.60 GHz = Automated Procedure Available Frequency Response AdjustmentFrequency Response Adjustment 17. Frequency Response Adjustment Setup MHz RF gain DAC value Frequency‘Response Adjustment Calibrator Amplitude Adjustment Calibrator Amplitude Adjustment MHz Reference Adjustment-OCXO Non-Option MHz Reference Adjustment-OCXO Non-Option 19 MHz Reference Adjustment Setup and Adjustment Location OFF MHz Reference Adjustment-TCXO Option MHz Reference Adjustment-TCXO Option Procedure Demodulator Adjustment Demodulator Adjustment SPAN, Zero Span 22. Demodulator Adjustment Locations Adjustment Procedures External Mixer Bias Adjustment Non-Option 23. External Mixer Bias Adjustment Setup External Mixer Amplitude Adjustment Non-Option External Mixer Amplitude Adjustment Non-Option Supplied with HP 8481D EXT MXR REF CAL YIG-Tuned Filter/Mixer Rythm Adjustment 25. Rythm Adjustment Setup YIG-Tuned Filter/Mixer Rythm Adjustment Save Presel PK MHz PLL Adjustment MHz PLL Adjustment 27 MHz PLL Adjustment Location MHz PLL Adjustment MHz Reference Adjustment Frequency Response Adjustment Software Frequency Response Adjustment Software 3-l Frequency Response Adjustment Software Getting StartedSpectrum Analyzers Controller Computer Test Equipment Warmup Spectrum Analyzer Warmup Warmup TimeRequired Test Equipment Summary Computer Controller Setup Adjustment SetupsEquipment Connections HP-IB Cables Loading the Program Using Frequency Response Adjustment SoftwareProgram Operation Power Sensors Conditions MenuTest Record Header Information System Mass Storage File Location Setting HP-IB Addresses Storing and Loading the Conditions File Getting to the Adjust Menu Exiting Frequency Response AdjustmentVerifying the HP-IB Querying the Spectrum Analyzer Serial Number Adding a Power Sensor Data File Sensor Utilities Menu Adjust Menu Single Test Calibrate Power SensorList Equipment Frequency Response Adjustment Menu Softkeys List Files Single Test Cal Sensor List Equip Cond Menu Assemblies Adjusted APC 3.5 Cable 0 E’ Frequency Response Adjustment Error Messages Error Messages Beginning with Alphabetic Characters Power meter reads value dBm File filename not foundInsufficient equip. to do test test number test name No HP-IB address listed for DUT Error Messages Beginning with Numeric Characters Error Messages Beginning with Variables Assembly Replacement Assembly Replacement Access to Internal Assemblies Cable Color Code Required Tools Procedure I. Spectrum Analyzer Cover Removal/Replacement Procedure 2. Al Front Frame/Al8 CRT Procedure 2. Al Front Frame/Al8 CRTRemoval Procedure 2. Al Front Frame/Al8 CRT Discharging High Voltage on the CRT Assembly Replacement Instrument A9, A18, and Line-Switch Assembly Mounting Screws Front frame Mounting Screws Replacement Installing the CRT and front frame Assemblies Assembly Replacement 4-l Placing the CRT into the Front Frame Procedure 2. Al Front Frame/Al8 CRT Procedure 3. Al Al Keyboard/Front Panel Keys Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 4. AlA RPG Procedure 5. A2, A3, A4, and A5 Assemblies Procedure 5. A2, A3, A4, and A5 AssembliesAssembly Replacement 4 A2, A3, A4, and A5 Assembly Removal 4P3 Assembly Cables 2 Assembly Replacement Procedure 5. A2, A3, A4, and AS Assemblies Coaxial Cable Clip 10. HP-IB and AlAl Wl Cable Placement Assembly Replacement Procedure 6. A6 Power Supply Assembly Procedure 6. A6 Power Supply Assembly Replacement 1. A6 Power Supply Connections Assembly Replacement 12. Power Supply Cover Assembly Replacement Procedure 7. A6Al High Voltage Assembly Procedure 7. A6Al High Voltage Assembly 13. Al6 Fast ADC and Al7 CRT Driver Mounting Screws Procedure 7. A6Al High Voltage Assembly Procedure 8. A7 through Al3 Assemblies Procedure 6. A7 through Al3 Assemblies 14. HP 6562E Assembly Locations A7 First LO Distribution Amplifier A8 Low Band Mixer Assembly Replacement 4-3A8 Low Band Mixer A9 Input Attenuator A9 Input Attenuator A10 YIG-Tuned Filter/Mixer Rythm 16. A10 Mounting Screws All YTO All YTO Al3 Second Converter Procedure 9. Al4 and Al5 Assemblies Procedure 9. Al4 and A15 Assemblies Procedure 9. Al4 and Al5 Assemblies 19. Al4 and Al5 Assembly Cables Assembly Replacement Procedure 10. Al6 Fast ADC and Al7 CRT Driver 20. Al6 and Al7 Mounting Screws Assembly Replacement Procedure 10. Al6 Fast ADC and Al7 CRT Driver 21. Al6 Cable Routing Assembly Replacement Procedure 11. Bl Fan Procedure 12. BTI Battery Procedure 12. ET1 Battery Procedure 13. Rear Frame/Rear Dress Panel Procedure 13. Rear Frame/Rear Dress Panel 22. Main Deck Screws W24, coax 5 W23, coax 23. A6 Power Supply Cover Assembly Replacement Procedure 14. W3 Line Switch Cable Personnel and damage to the instrument Procedure 14. W3 Line Switch Cable 24. W3 Dress and Connection to A6 Power Supply Screw Quantity Standoff Replacement Using Contact Removal Tool, HP part number 26. W3 Cable Connector Replacement without Contact Removal Tool 27. Side Frame Mounting Screws Procedure 15. Eerom A2U500 Procedure 15. Eerom A2U500 Procedure 16. A21 Ocxo 28. A21 Ocxo Mounting Screws Assembly Replacement Procedure 16. A21 Ocxo Direct Mail-Order System Ordering InformationReplaceable Parts 5-l Parts List Format Firmware-Dependent Part NumbersDirect Phone-Order System Replaceable Parts Reference Designations, Abbreviations and Multipliers Reference Designations, Abbreviations, and Multipliers 2 Reference Designations, Abbreviations, and Multipliers 3 Manufacturers Code List Reference Designations, Abbreviations, and Multipliers 4 Qty Front Handle ASS’Y Mount Flange Front Frame AssemblySLIDE-CHAS 25-IN-LG 21.84-IN-TRVL Cable Assembly Ribbon Cable Assembly Probe POWER/LEDController Assembly Interface Assembly CRT Driver Assembly CRT Assembly HP-IB AssemblyBattery 3.0 V 1.2 A-HR Lithium Not Assigned Line Filter Assembly If 1 Bottom Power CABLE, Ribbon Cable Assembly Line SwitchCable ASSEMBLY, Speaker Cable ASSEMBLY, A7/A8 Drive Cable ASSEMBLY, A10 Rythm Drive Cable ASSEMBLY, Coax 97, LO SweepCable ASSEMBLY, Coax Cable ASSEMBLY, Coax 6, 0 Span Video Cable ASSEMBLY, SEMI-RIGID, 1ST LO Cable ASSEMBLY, SEMI-RIGID, 1ST MixerCable ASSEMBLY, Coax 89, CAL OUT Cable ASSEMBLY, SEMI-RIGID, RF Input Parts Identification, Assembly Mounting Parts List, Cover Assembly Parts List, Main Chassis SPACER, CRT TUBE, CRT Parts List, RF Section Probe Power Jack Parts List, Front Frame00000 SCREW-MACHINE Assembly M3 X 0.5 12MM-LG Rubber Keypad Includes KeycapsLED-LAMP LUM-INT=560UCD IF=SOMA-MAX Keycap Line Parts List, Rear Frame 5062-7755 3 1 Battery Holder Includes WiresMonofluoride Line Filter Module \ \ ‘v’ FI c P3$CES ‘\‘\ Major Assembly and Cable Locations Major Assembly and Cable Locations FL3 not Assigned FL4 A21OCXO Cables Hinged Assemblies 1W2 W52 I T E Bottom View Al5 Unfolded Major Assembly and Cable Locations WI8 Aiai Al6 Fast ADC Option Major Assembly and Cable Locations \\\ Rear View Major Assembly and Cable Locations 6-l Block Diagrams Assembly Level TextGeneral Troubleshooting 7-l Assembly Test Points General TroubleshootingRibbon Cables Pad @AMPLIFIER Ribbon Cable Connections 1 General Troubleshooting Ribbon Cable Connections 2 General Troubleshooting Service Cal Data Softkey Menus Service Cal Data Menu PKEq Troubleshooting to a Functional Section Location of Assembly Troubleshooting Text SlodaRythm CRT TAM Test and Adjustment Module Loading the software Data files and system mass storage files HP-IB addressesExecuting a test TAM Requirements Test Connectors Revision ConnectorsInconsistent Results Erroneous Results Automatic Fault Isolation Display/Power SupplyController Check ADC/lnterface Check LO Control Check Manual Probe TroubleshootingRF Low Band Check RF Path Fault Isolation Calibration Oscillator Troubleshooting Mode Error Messages Viewing Multiple Messages System Analyzer Programming Errors 100 to Error Message Elimination ADC Errors 200 to System Roller PLL Errors 302 to YTO Loop Errors 300 toLO and RF Hardware/Firmware Failures 300 to General Troubleshooting General Troubleshooting YTO Loop Errors 317 to Roller Oscillator Errors 321 to YTO Loop Error OFF Unlk Freq ACC MHz Reference Loop YTO Leveling LoopSampling Oscillator Fractional N PLL YTO Loop Settling Errors 351 to Span Accuracy Calibration Errors 356 to Automatic if Errors 400 to RBW RBW 3K General Troubleshooting 7-3 LIN Ampl LOG Ampl General Troubleshooting Ampl 1M General Troubleshooting General Troubleshooting 300 MHz Digital and Checksum Errors 700 to System Errors 600 toEerom Checksum Errors 700 to Program ROM Checksum Errors 705 to ROM U306 ROM U307 ROM U308 ROM U309 ROM U310 ROM U311 Battery Problem Model Number ErrorRAM Check Errors 711 to Microprocessor Error 7 Fast ADC Error System Errors 750 toOption Module Errors 800 to User-Generated Errors 900 to TG Unlvl Block Diagram Description Functional Sections General Troubleshooting RF Section A7 Sloda Al3 Second Converter A10 YIG-Tuned Filter/MixerSecond if Amplifier part of A15 Third Converter part of A15 Flatness Compensation Amplifiers part of AM Synthesizer Section Sweeping the First LOReference PLL part of A15 YTO PLL A7, All, part of A14, part of A15 Phase Lock Loops Fractional N PLL part of A14 Offset Lock Loop part of A15 A4 Log Amplifier/Cal Oscillator Assembly If Section ADC/lnterface Section A5 if AssemblyLog Expand/Video Functions Triggering Controller SectionFirmware Display/Power Supply Section A6 Power SupplyDisplay ASM Al7 CRT Display DriverPage Page Page Page ADC/lnterface Section ADC/lnterface Section W2 Control Cable Connections ADC/lntetface Section GND RF Gain LO3 ERR LVFC-ENABLE FC ERR YTO ERRGND Scan Ramp Video Trigger DAC2 Troubleshooting Using the TAM A3 Test Connectors Automatic Fault Isolation References ADC ASM ADC MUX TAM Tests versus A3 Test Connectors Keyboard Interface Keyboard/RPG ProblemsKeyboard Matrix RPG Interface Triggering or Video Gating Problems Counter FrequenciesTrigger MUX Truth Table Free RUN Video Line External 10 ADC/lnterface Section Yiiqx5q Level Preselector Peaking Control Real Time DAC 12 ADC/lntertace Section Flatness Control RF Gain DACs ADC/lntefface Section A3 Assembly Video Circuits 14 ADC/lnterface Section Log Offset/Log Expand Video MUX 16 ADC/lnterface Section Video Filter Latch Outputs Video Filter Buffer Amplifier18 ADC/lnterface Section Select Desectdr POS Peak mode Positive/Negative Peak Detectors HMUX-SELO/l versus Detector Mode Peak Detector Reset20 ADC/lnterface Section Rosenfell Detector ADC MUX Logic Levels at A3U108 22 ADC/lnterface Section Variable Gain Amplifier VGA Track and Hold ADC Control Signals A3 Assembly ADC Circuits24 ADC/lnterface Section ADC Start/Stop Control ADC ASM 26 ADC/lnterface Section Ramp Counter Analog Bus Drivers A3 Assembly Control Circuits28 ADC/lnterface Section Analog Bus Timing Interface Strobe Select 10. Demultiple er A3U410 Truth Table1. Demultiple er A3U500 Truth Table 30 ADC/lnterface Section Al6 Assembly Fast ADC Circuits Option Video Input Scaling Amplifiers and Limiter Bit Flash ADC 32 ADC/lnterface Section Peak/Pit Detection Byte Static RAMPOS NEG Al6 Assembly Fast ADC Control Circuits Option CPU Interface and Control Registers13. Control Word at Primary Address U3 and U4 34 ADC/lntertace Section Vtrig POL LsampleLadcen Lloadaddr 38 ADC/lnterface Section Reference ClockHswp Clock and Sample Rate Generator Trigger Bit Post-Trigger Counter Bit 32 K Circular Address Counter Video Trigger Comparator Page QEL--QWa5-w---w If Section If -l If Section A4 LOG AMP/CAL OSC Troubleshooting the Log Amplifier with the TAM Troubleshooting A5 with the TAM TAM Tests versus Test Connectors Fdac Ifdac Cal fist Troubleshooting Nude Troubleshooting the Cal Oscillator with the TAM Automatic if Adjustment Sweep Width Settings Parameters Adjusted Requirements If Gain Uncertainty Performance lest Performance Test FailuresScale Fidelity Performance lest Resolution Bandwidths Performance Tests Log Amplifier P/O A4 AssemblyLog Amplifier Linear Amplifiers If Gain Application Guidelines ATTEN=lO dB Video Off set Frequency Counter Prescaler/Conditioner Video OutputAM/FM Demodulator KHz if Filters MHz if Filters KHz and 10.7 MHz if Filters MHz Vcxo LO Switch Input SwitchSynchronous Detector Log Off set/Gain Compensation A5 if Assembly If Signature KHz If Adjust Signature If Section Detailed if Adjust Signature LOG Ofysets Common if Signature Problems 510 CjBm,-‘-ifTiN= dB 0 dBm II ill M P L E IIilI L3klB 11. Region B Amplitude Variation MHz Resolution Bandwidth Problems 500 KHz Resolution Bandwidth Problems KHz and 10 kHz Resolution Bandwidth Problems 15. Faulty Crystal Symmetry Step Gains Cal Oscillator P/O A4 Assembly Cal Oscillator Unlock at Beginning of if Adjust Inadequate CAL OSC Amptd Range Hz to 3 kHz Resolution Bandwidth Out of Specification 16. Output Waveform, 10 kHz Resolution Bandwidth If Section 17. Output Waveform, 3 kHz Resolution Bandwidth 19. Output Waveform, 300 Hz Resolution Bandwidth Sweep Generator Low-Pass FilterAM/FM Demodulation, Audio Amplifier, and Speaker If Section Page Page Page Controller Section Controller -l MSl, MS3 through MS6, MS8 2 Controller Section A2 Test Connectors Controller Section Digital Signature Analysis DSA Display ProblemsLine Generators Blanking Line Generator Output Waveforms Blanking Waveforms 6 Controller Section Display Jumbled or Trace Off Screen Expanded Blanking Waveforms Switch Driver Waveform Lchar IO-8 Controller Section Distorted X/Y Line Generator Waveforms Bad Characters or Graticule IntensityLo-10 Controller Section Long Lines Dimmer Than Short Lines Delta X Waveform Analog Zero-Span Problems Non-Option Lo-12 Controller Section Frequency-Count Marker Problems Controller Section lo Gate Times Frequency CounterLo-14 Controller Section State- and Trace-Storage Problems Controller Section lo-15 Keyboard Problems Lo-16 Controller SectionPage Synthesizer Section Synthesizer l-1 A21 Ocxo Synthesizer Section Al4 and Al5 Test Connectors TAM Connector Pin Locations L. Measured Signal Line Location 4 Synthesizer Section Synthesizer l-5 6 Synthesizer Section DAC MS7FAV YTF OFL AGCMS1 MS2 MS3 MS4 MS6 MS8 MS5,MS7,MS8 MS8 MS2 MS5 MS6 MS7 Troubleshooting Test Setup Confirming a Faulty Synthesizer Section8 Synthesizer Section YTO PLL Center Frequency Tuning Values Check A3 ADC MUX Function Block stepsCheck A14J301 10 MHz reference input steps Synthesizer l-9 Check Al4 frequency control assembly steps Check First LO steps YTO Loop Test Setup Check Al5 RF assembly steps Synthesizer -l 4. Sampler and Sampling Oscillator Test Setup 12 Synthesizer Section General PLL Troubleshooting PLL Locked at Wrong FrequencySampling Oscillator Test Frequencies Synthesizer REF- \ Y PLL Locked at Wrong Frequency Synthesizer Section Unlocked PLL Synthesizer l-15 Troubleshooting Unlocked Reference PLLOperation Check 100 MHz VCXO, tripler, and doubler steps Check 10 MHz reference to phase/frequency detector steps Check phase/frequency detector steps Check the 100 MHz lock loop integrator steps Third LO Driver Amplifier Check level at amplifier input steps Unlocked Offset Lock Loop Sampling Oscillator Check loop references steps 1Check levels into mixer steps 20 Synthesizer Section Sampling Oscillator PLL Divide Numbers Check path to phase/frequency detector steps Unlocked YTO PLL 7. Amplifier Polarities Troubleshooting an Unlocked YTO PLL 7. Troubleshooting an Unlocked YTO PLL Synthesizer l-25 Check First LO pretune frequency and amplitude steps 26 Synthesizer Section Check the fractional N oscillator steps Check sampler drive output of A7 Sloda stepsCheck sampler if steps Check FM loop sense steps Synthesizer Section Voltages in FM Coil and Main Loop Drivers Check main coil coarse and fine DACs stepsCheck main coil tune DAC steps Main Coil Coarse and Fine DACs Voltages 30 Synthesizer Section Unlocked Fractional N PLL Confirming an Unlocked Condition 10. Postscaler Divide Numbers Fractional N PLL32 Synthesizer Section Vco 1 1. Unlocked Fractional N Troubleshooting AreasVCO 0AT VOLTAGE-CONTROLLED Oscillator 12. Divider and Integrator Troubleshooting Synthesizer l-35 Frequency Span Accuracy Problems 13. Sweep Signal Destination versus SpanDetermining the First LO Span 14. Harmonic Mixing Number versus Center Frequency Confirming Span Problems Synthesizer l-37 YTO Main Coil Span Problems LO Spans 20 MHz YTO FM Coil Span Problems LO Spans 2.01 MHz to 20 MHz15. Settings of Sweep Switches 38 Synthesizer Section Fractional N Span Problems LO Spans 52 MHz Synthesizer l-39 First LO Span Problems All Spans Check span attenuator stepsCheck current source steps 40 Synthesizer Section First LO Span Problems Multiband Sweeps 16. Settings for Switches and Comparators HP 6562E Sweep and Scan Ramps Synthesizer Section Phase Noise in Locked versus Unlocked Spans Phase Noise ProblemsReference versus Reference PLL Phase Noise Fractional N versus Offset PLL or YTO PLL Phase Noise Fractional N PLL Phase Noise Sampler and Sampler if Set a microwave source to the following settings Sweep Generator Circuit 10. Simplified Synthesizer Section JP/O a l Al5 RF A21 Ocxo 50 Synthesizer SectionPage Page RF Section RF Section Al4 and Al5 Test Connectors RF Section Automatic Fault Isolation References Low Band Problems PIN High Band Problems Low and High Band Problems ‘0 0 0 0 0 0 A7 LO Distribution Amplifier A8 Low Band Mixer A9 Input Attenuator Low RF Section Loda Drive Al4 Frequency Control AssemblyRF -l Control Latch for Band-Switch Driver A7 First LO Distribution Amplifier Drive YTF Driver Circuit FE RUI HP 8582E Rear-Panel LO SWP Output Sweep + Tune Multiplier Values Pbbzl Offset Confirming a Faulty Third Converter Al5 RF AssemblyConfirming Third Converter Output Third Converter Flatness Compensation Control Control Latches SIG ID Oscillator Option MHz Reference Q604 on MHz Reference at A15J302 RF Section MHz TTL Reference at U304 Pin RF Section RF Section Mnemonic Table Page Isplay/Power Supply Section @I w3 GND Wl Power-Cable ConnectionsPWR UP Pms Pins 41’ +28 Blank Display Using the TAM Al7 Test Connector TAM Tests versus Test Connectors Blank Display Blanking Signal Probe Power Socket Display Distortion Focus Problems Intensity Problems Display/Power Supply -l Dead Power Supply A6 Power Supply Assembly TroubleshootingCheck the Supply Voltages Kick-start/Bias Buck Regulator Line Fuse Blowing Supply Restarting Every 1.5 Seconds Kick Start Buck Regulator Control Loop Low Voltage SuppliesHigh Voltage Supplies CRT Supply Dropping Out Buck Regulator Control DC-DC Converter Control Power Up Page Page Component-Level Information Packets Component-Level Information Packets A-l Table A-l. HP 8562 Spectrum Analyzer Documented Assemblies Component-Level Information Packets Table A-l. HP 8582 Spectrum Analyzer Documented Assemblies Component-Level Information Packets A-3Page Ocxo Index-l Index-2 AFI Index-3 Fadc Index-4 Index-5 Loda Index-6 Index-7 Index-6