Dead Power Supply | Agilent Technologies 856290216 specification

A6 Power Supply Assembly Troubleshooting

The spectrum analyzer uses a switching power supply operating at 40 kHz to supply the low voltages for most of the analyzer hardware, and a 30 kHz switching supply (CRT supply) to provide the high voltages for the CRT display. The CRT supply will be treated as a separate supply since the remainder of A6 must be operating for the CRT supply to operate.

Kick starting occurs when there is a fault either on the power supply or on one of the other assemblies. The power supply will try to start by generating a 200 ms pulse (“kick”) every

1.5seconds. A kick-starting power supply often appears to be dead, but the fan will make one or two revolutions and stop every 1.5 seconds.

Warning n The A6 power supply and A6Al high voltage assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies. Always disconnect the power cord from the instrument before servicing these assemblies. Failure to follow this precaution can present a shock hazard which may result in personal injury.

nThe voltage potential at A6AlW3 is +9 kV. If the cable must be disconnected, always disconnect it at the CRT with caution1 Failure to properly discharge A6AlW3 may result in severe electrical shock to personnel and damage to the instrument. See procedure 2, “Al Front Frame/Al6 CRT,” in Chapter 3, “Assembly Replacement.”

nAlways use an isolation transformer when troubleshooting either the A6 power supply or the A6Al HV module. When using an isolation transformer, connect a jumper between AGTPlOl and A6TP301. This connects the circuit common to earth ground. Remove this jumper when the isolation transformer is not used.

Dead Power Supply

Use an isolation transformer and connect a jumper between AGTPlOl and A6TP301.

Check the Supply Voltages

1.Connect the negative lead of a DVM to A6TP301.

2.Check TP308 for +5 V.

3.Check TP307 for -5 V.

4.Check TP302 for +15 V.

5.Check TP303 for -15 V.

6.Check TP304 for +28 V.

7.Check TP305 for -12.6 V.

13-12 Display/Power Supply Section

Image 462

Agilent Technologies 856290216 A6 Power Supply Assembly Troubleshooting, Dead Power Supply, Check the Supply Voltages

Contents

About this Manual Fia Hewlett HP Part No -90218 SupersedesPage Warranty CertificationRegulatory Information Safety Notes Assistance General Safety Considerations Prevent electrical shock, do not remove covers How to Use This Guide Documentation OutlineThis 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 Numbers and Repair Information Serial Number Label ExampleGeneral Information l-1 General Information Instrument VariationsTable l- 1. Instrument Variations A21 Ocxo HP 85629B Test and Adjustment Module General Information l-3 Service Kit Table l-2. Service Kit ContentsElectrostatic Discharge Reducing Potential for ESD Damage General Information l-5 Service Tag Returning Instruments for ServiceStatic-Safe Accessories 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 Adjustable and Factory-Selected Components Safety ConsiderationsWhich Adjustments Should Be Performed? Test Equipment Adjustment Tools Instrument Service Position8710-0033 Related Adjustments A5 if A10 Rythm Adjustable Components Smpl Match HV ADJFM Span 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 High Voltage Power Supply AdjustmentAssembly Adjusted Related Performance Test Procedure Equipment Display Adjustment Display Adjustment Preliminary Adjustments Cutoff AdjustmentDeflection 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 A5T200 Xtal CTR Factory-Selected Xtal Filter CapacitorsXtal Factory-Selected Capacitor Selection 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 Sampling Oscillator Adjustment Sampler Match 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 = Frequency Response Adjustment Automated Procedure AvailableFrequency 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 Spectrum Analyzers Frequency Response Adjustment SoftwareGetting Started Controller Computer Warmup Time Test Equipment Warmup Spectrum Analyzer WarmupRequired Test Equipment Summary Equipment Connections Computer Controller SetupAdjustment Setups HP-IB Cables Using Frequency Response Adjustment Software Loading the ProgramProgram Operation Test Record Header Information Power SensorsConditions Menu System Mass Storage File Location Setting HP-IB Addresses Storing and Loading the Conditions File Verifying the HP-IB Getting to the Adjust MenuExiting Frequency Response Adjustment Querying the Spectrum Analyzer Serial Number Adding a Power Sensor Data File Sensor Utilities Menu Adjust Menu Calibrate Power Sensor Single TestList 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 Insufficient equip. to do test test number test name Power meter reads value dBmFile filename not found 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 Assembly Replacement 4-3 A8 Low Band MixerA8 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 Ordering Information Direct Mail-Order SystemReplaceable Parts 5-l Direct Phone-Order System Parts List FormatFirmware-Dependent Part Numbers 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 Frame Assembly Front Handle ASS’Y Mount FlangeSLIDE-CHAS 25-IN-LG 21.84-IN-TRVL Controller Assembly Cable Assembly RibbonCable Assembly Probe POWER/LED Interface Assembly Battery 3.0 V 1.2 A-HR Lithium CRT Driver Assembly CRT AssemblyHP-IB Assembly Not Assigned Line Filter Assembly If 1 Bottom Cable ASSEMBLY, Speaker Power CABLE, RibbonCable Assembly Line Switch Cable ASSEMBLY, A7/A8 Drive Cable ASSEMBLY, Coax Cable ASSEMBLY, A10 Rythm DriveCable ASSEMBLY, Coax 97, LO Sweep Cable ASSEMBLY, Coax 6, 0 Span Video Cable ASSEMBLY, Coax 89, CAL OUT Cable ASSEMBLY, SEMI-RIGID, 1ST LOCable ASSEMBLY, SEMI-RIGID, 1ST Mixer 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 Parts List, Front Frame Probe Power Jack00000 LED-LAMP LUM-INT=560UCD IF=SOMA-MAX SCREW-MACHINE Assembly M3 X 0.5 12MM-LGRubber Keypad Includes Keycaps Keycap Line Monofluoride Parts List, Rear Frame5062-7755 3 1 Battery Holder Includes Wires 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 Assembly Level Text Block DiagramsGeneral Troubleshooting 7-l Ribbon Cables Assembly Test PointsGeneral Troubleshooting 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 Rythm Location of Assembly Troubleshooting TextSloda CRT TAM Test and Adjustment Module Loading the software HP-IB addresses Data files and system mass storage filesExecuting a test TAM Requirements Inconsistent Results Test ConnectorsRevision Connectors Erroneous Results Controller Check Automatic Fault IsolationDisplay/Power Supply ADC/lnterface Check Manual Probe Troubleshooting LO Control CheckRF 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 YTO Loop Errors 300 to Roller PLL Errors 302 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 Sampling Oscillator MHz Reference LoopYTO Leveling Loop 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 System Errors 600 to Digital and Checksum Errors 700 toEerom Checksum Errors 700 to Program ROM Checksum Errors 705 to ROM U306 ROM U307 ROM U308 ROM U309 ROM U310 ROM U311 RAM Check Errors 711 to Battery ProblemModel Number Error Microprocessor Error 7 System Errors 750 to Fast ADC ErrorOption Module Errors 800 to User-Generated Errors 900 to TG Unlvl Block Diagram Description Functional Sections General Troubleshooting RF Section A7 Sloda A10 YIG-Tuned Filter/Mixer Al3 Second ConverterSecond if Amplifier part of A15 Third Converter part of A15 Flatness Compensation Amplifiers part of AM Reference PLL part of A15 Synthesizer SectionSweeping the First LO 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 A5 if Assembly ADC/lnterface SectionLog Expand/Video Functions Controller Section TriggeringFirmware Display ASM Display/Power Supply SectionA6 Power Supply Al7 CRT Display DriverPage Page Page Page ADC/lnterface Section ADC/lnterface Section W2 Control Cable Connections GND RF Gain LO3 ERR LVFC-ENABLE FC ERR YTO ERR ADC/lntetface SectionGND 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/RPG Problems Keyboard InterfaceKeyboard Matrix RPG Interface Trigger MUX Truth Table Triggering or Video Gating ProblemsCounter Frequencies 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 Video Filter Buffer Amplifier Latch Outputs18 ADC/lnterface Section Select Desectdr POS Peak mode Positive/Negative Peak Detectors Peak Detector Reset HMUX-SELO/l versus Detector Mode20 ADC/lnterface Section Rosenfell Detector ADC MUX Logic Levels at A3U108 22 ADC/lnterface Section Variable Gain Amplifier VGA Track and Hold A3 Assembly ADC Circuits ADC Control Signals24 ADC/lnterface Section ADC Start/Stop Control ADC ASM 26 ADC/lnterface Section Ramp Counter A3 Assembly Control Circuits Analog Bus Drivers28 ADC/lnterface Section Analog Bus Timing 1. Demultiple er A3U500 Truth Table Interface Strobe Select10. Demultiple er A3U410 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 POS Peak/Pit DetectionByte Static RAM NEG 13. Control Word at Primary Address U3 and U4 Al6 Assembly Fast ADC Control Circuits OptionCPU Interface and Control Registers 34 ADC/lntertace Section Ladcen Vtrig POLLsample Lloadaddr Reference Clock 38 ADC/lnterface SectionHswp 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 Performance Test Failures If Gain Uncertainty Performance lestScale Fidelity Performance lest Log Amplifier P/O A4 Assembly Resolution Bandwidths Performance TestsLog Amplifier Linear Amplifiers If Gain Application Guidelines ATTEN=lO dB Video Off set Video Output Frequency Counter Prescaler/ConditionerAM/FM Demodulator KHz if Filters MHz if Filters KHz and 10.7 MHz if Filters MHz Vcxo Input Switch LO 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 Low-Pass Filter Sweep GeneratorAM/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 Display Problems Digital Signature Analysis DSALine 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 Intensity Bad Characters or GraticuleLo-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 Frequency Counter Gate TimesLo-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 FAV 6 Synthesizer SectionDAC MS7 YTF MS1 MS2 MS3 MS4 MS6 MS8 MS5,MS7,MS8 OFLAGC MS8 MS2 MS5 MS6 MS7 8 Synthesizer Section Troubleshooting Test SetupConfirming a Faulty Synthesizer Section YTO PLL Check A14J301 10 MHz reference input steps Center Frequency Tuning ValuesCheck A3 ADC MUX Function Block 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 Sampling Oscillator Test Frequencies General PLL TroubleshootingPLL Locked at Wrong Frequency Synthesizer REF- \ Y PLL Locked at Wrong Frequency Synthesizer Section Unlocked PLL Synthesizer l-15 Operation TroubleshootingUnlocked Reference PLL 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 Check levels into mixer steps Unlocked Offset Lock Loop Sampling OscillatorCheck loop references steps 1 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 sampler if steps Check the fractional N oscillator stepsCheck sampler drive output of A7 Sloda steps Check FM loop sense steps Synthesizer Section Check main coil tune DAC steps Voltages in FM Coil and Main Loop DriversCheck main coil coarse and fine DACs steps Main Coil Coarse and Fine DACs Voltages 30 Synthesizer Section Unlocked Fractional N PLL Confirming an Unlocked Condition Fractional N PLL 10. Postscaler Divide Numbers32 Synthesizer Section 1 1. Unlocked Fractional N Troubleshooting Areas VcoVCO 0AT VOLTAGE-CONTROLLED Oscillator 12. Divider and Integrator Troubleshooting Synthesizer l-35 Determining the First LO Span Frequency Span Accuracy Problems13. Sweep Signal Destination versus Span 14. Harmonic Mixing Number versus Center Frequency Confirming Span Problems Synthesizer l-37 15. Settings of Sweep Switches YTO Main Coil Span Problems LO Spans 20 MHzYTO FM Coil Span Problems LO Spans 2.01 MHz to 20 MHz 38 Synthesizer Section Fractional N Span Problems LO Spans 52 MHz Synthesizer l-39 Check current source steps First LO Span Problems All SpansCheck span attenuator 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 Problems Phase Noise in Locked versus Unlocked SpansReference 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 Al4 Frequency Control Assembly Loda DriveRF -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 Al5 RF Assembly Confirming a Faulty Third ConverterConfirming 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 Wl Power-Cable Connections GNDPWR 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 A6 Power Supply Assembly Troubleshooting Dead Power SupplyCheck the Supply Voltages Kick-start/Bias Buck Regulator Line Fuse Blowing Supply Restarting Every 1.5 Seconds Kick Start Low Voltage Supplies Buck Regulator Control LoopHigh 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