Check main coil tune DAC steps | Agilent Technologies 856290216

Table 11-8. Voltages in FM Coil and Main Loop Drivers

Measurement Points	Voltages
A14U405 pin 6	+2.8 Vdc
A14U322 pin 2	0 Vdc
A14J17 pin 4	>+10 Vdc

Check main coil coarse and fine DACs (steps 41-44)

41.The main coil coarse and fine DACs correct any initial pretune errors in the YTO main coil. The DACs adjust the FM-coil current to zero before any sweep begins. Refer to function block J of Al4 frequency control schematic.

42.Set the spectrum analyzer to the settings listed below. This sets both DACs to 128 (the DAC setting range is 0 to 255).

Centerfrequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Single.EXT

(with no external trigger connected)

43.Press (SAVE), PWR flN STATE and turn off the spectrum analyzer.

44.Place jumper A14J23 in the TEST position and turn on the spectrum analyzer.

Check main coil tune DAC (steps 4549)

45.Verify the voltages listed in Table 11-9.

Table 11-9. Main Coil Coarse and Fine DACs Voltages

Measurement Points	Voltages
A14J17 pin 2	-5	Vdc
A14J17 pin 3	-5	Vdc
A14J17 pin 5	+5 Vdc

46.Place jumper A14J23 in the NORMAL position.

47.Set the spectrum analyzer to the following settings:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

48.Place jumper A14J23 in the TEST position.

49.Measure the output of the main coil tune DAC (A14J18 pin 3) with a DVM. Refer to function block E of Al4 frequency control schematic.

Synthesizer Section 11-29

Image 403

Agilent Technologies 856290216 Voltages in FM Coil and Main Loop Drivers, Check main coil coarse and fine DACs steps

Contents

About this Manual HP Part No -90218 Supersedes Fia HewlettPage Certification WarrantyRegulatory Information Assistance Safety Notes Prevent electrical shock, do not remove covers General Safety Considerations 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 Tables Contents-15 PLL Serial Number Label Example Serial Numbers and Repair InformationGeneral Information l-1 A21 Ocxo Instrument VariationsTable l- 1. Instrument Variations General Information General Information l-3 HP 85629B Test and Adjustment Module Table l-2. Service Kit Contents Service KitElectrostatic Discharge General Information l-5 Reducing Potential for ESD Damage Static-Safe Accessories Returning Instruments for ServiceStatic-Safe Accessories Service Tag Other Packaging 9211-6969 Outer Carton 9220-5073 Pads 9220-5072 Top Tray General Information l-9 Recommended Test Equipment Instrument Sources Table l-4. Recommended Test Equipment General Information l-l Recommended Test Equipment Instrument Critical Specifications Recommended Use Instrument Accessories PAV PAM Sales and Service Offices US Field Operations Hewlett-Packard Sales and Service Offices Introduction Adjustment Procedures Test Equipment Safety ConsiderationsWhich Adjustments Should Be Performed? Adjustable and Factory-Selected Components Instrument Service Position Adjustment Tools8710-0033 A5 if Related Adjustments A10 Rythm Adjustable Components VCO Range HV ADJFM Span Smpl Match Factory Selected Components Adjustment Indicator Using the TAM YTO TAM Adjustments Required Test Equipment for TAM Adjustment Procedures 2-l Front End Cal adjustment Related Performance Test High Voltage Power Supply AdjustmentAssembly Adjusted High Voltage Power Supply Adjustment Equipment Procedure Display Adjustment Display Adjustment Cutoff Adjustment Preliminary AdjustmentsDeflection Adjustments CRT Adjust Pattern Adjustment Procedures Intensity Adjustments A2 Display Adjustment Locations Fast Zero Span Adjustments Press SAVEI, Save State ,and State If Bandpass Adjustment If Bandpass Adjustment TAM Connector Pin Locations LC Bandpass Adjustments Factory-Selected LC Filter Capacitors Xtal Bandpass Adjustments A5T202 Xtal CTR Factory-Selected Xtal Filter CapacitorsXtal Factory-Selected Capacitor Selection A5T200 Xtal CTR If Bandpass Adjustment 10. Capacitor Part Numbers Related Performance Tests If Amplitude Adjustments If Amplitude Adjustment Locations If Amplitude Adjustments A5 Reference Attenuator Adjustment A5 Adjustment Verification DC Log Adjustment Setup Adjustment Procedures DC Log Amplifier Adjustments DC Log Amplifier Adjustments A4 Limiter Phase Adjustment Log Amplifier Adjustments A4 Linear Fidelity Adjustment Press -,a, if AlI on OFF OFF, AD3 Curr if State A4 LOG Fidelity Adjustment 11. Sampler Adjustment Setup Sampling Oscillator Adjustment Sampler Match Adjustment Sampling Oscillator AdjustmentSampling Oscillator Adjustment Sampling Oscillator Adjustment 1. Sampling Adjustments YTO Adjustment YTO Adjustment 07SAVE Save STATE, State RECALL, Recall STATE, State YTO Main Coil Adjustments 14. YTO Adjustment Locations YTO FM Coil Adjustments 15. First LO Distribution Amplifier Adjustment Setup LO Distribution Amplifier Adjustment 18. TAM Connector Pin Locations LO Distribution Amplifier Adjustment 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 19 MHz Reference Adjustment Setup and Adjustment Location MHz Reference Adjustment-OCXO Non-Option 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 23. External Mixer Bias Adjustment Setup External Mixer Bias Adjustment Non-Option External Mixer Amplitude Adjustment Non-Option External Mixer Amplitude Adjustment Non-Option Supplied with HP 8481D EXT MXR REF CAL 25. Rythm Adjustment Setup YIG-Tuned Filter/Mixer Rythm Adjustment 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 3-l Frequency Response Adjustment Software Controller Computer Frequency Response Adjustment SoftwareGetting Started Spectrum Analyzers Test Equipment Warmup Spectrum Analyzer Warmup Warmup TimeRequired Test Equipment Summary HP-IB Cables Computer Controller SetupAdjustment Setups Equipment Connections Loading the Program Using Frequency Response Adjustment SoftwareProgram Operation System Mass Storage File Location Power SensorsConditions Menu Test Record Header Information Storing and Loading the Conditions File Setting HP-IB Addresses Querying the Spectrum Analyzer Serial Number Getting to the Adjust MenuExiting Frequency Response Adjustment Verifying the HP-IB Sensor Utilities Menu Adding a Power Sensor Data File Adjust Menu Single Test Calibrate Power SensorList Equipment List Files Frequency Response Adjustment Menu Softkeys Single Test Cal Sensor List Equip Cond Menu Assemblies Adjusted APC 3.5 Cable 0 E’ Error Messages Beginning with Alphabetic Characters Frequency Response Adjustment Error Messages No HP-IB address listed for DUT Power meter reads value dBmFile filename not found Insufficient equip. to do test test number test name Error Messages Beginning with Numeric Characters Error Messages Beginning with Variables Assembly Replacement Assembly Replacement Access to Internal Assemblies Required Tools Cable Color Code Removal/Replacement Procedure I. Spectrum Analyzer Cover Procedure 2. Al Front Frame/Al8 CRT Procedure 2. Al Front Frame/Al8 CRTRemoval Procedure 2. Al Front Frame/Al8 CRT Instrument Discharging High Voltage on the CRT Assembly Replacement A9, A18, and Line-Switch Assembly Mounting Screws Front frame Mounting Screws Installing the CRT and front frame Assemblies Replacement Placing the CRT into the Front Frame Assembly Replacement 4-l Procedure 2. Al Front Frame/Al8 CRT Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 3. Al Al 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 Coaxial Cable Clip Procedure 5. A2, A3, A4, and AS Assemblies 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 14. HP 6562E Assembly Locations Procedure 6. A7 through Al3 Assemblies A7 First LO Distribution Amplifier A8 Low Band Mixer Assembly Replacement 4-3A8 Low Band Mixer A9 Input Attenuator A9 Input Attenuator 16. A10 Mounting Screws A10 YIG-Tuned Filter/Mixer Rythm All YTO All YTO Al3 Second Converter Procedure 9. Al4 and A15 Assemblies Procedure 9. Al4 and Al5 Assemblies Procedure 9. Al4 and Al5 Assemblies 19. Al4 and Al5 Assembly Cables Assembly Replacement 20. Al6 and Al7 Mounting Screws Assembly Replacement Procedure 10. Al6 Fast ADC and Al7 CRT Driver 21. Al6 Cable Routing Assembly Replacement Procedure 10. Al6 Fast ADC and Al7 CRT Driver Procedure 11. Bl Fan Procedure 12. ET1 Battery Procedure 12. BTI Battery Procedure 13. Rear Frame/Rear Dress Panel 22. Main Deck Screws Procedure 13. Rear Frame/Rear Dress Panel W24, coax 5 W23, coax 23. A6 Power Supply Cover Assembly Replacement Personnel and damage to the instrument Procedure 14. W3 Line Switch Cable 24. W3 Dress and Connection to A6 Power Supply Procedure 14. W3 Line Switch Cable Screw Quantity Standoff 26. W3 Cable Connector Replacement Using Contact Removal Tool, HP part number Replacement without Contact Removal Tool 27. Side Frame Mounting Screws Procedure 15. Eerom A2U500 Procedure 15. Eerom A2U500 28. A21 Ocxo Mounting Screws Assembly Replacement Procedure 16. A21 Ocxo Procedure 16. A21 Ocxo Direct Mail-Order System Ordering InformationReplaceable Parts 5-l Replaceable Parts Parts List FormatFirmware-Dependent Part Numbers Direct Phone-Order System Reference Designations, Abbreviations and Multipliers Reference Designations, Abbreviations, and Multipliers 2 Reference Designations, Abbreviations, and Multipliers 3 Reference Designations, Abbreviations, and Multipliers 4 Manufacturers Code List Qty Front Handle ASS’Y Mount Flange Front Frame AssemblySLIDE-CHAS 25-IN-LG 21.84-IN-TRVL Interface Assembly Cable Assembly RibbonCable Assembly Probe POWER/LED Controller Assembly Not Assigned Line Filter Assembly CRT Driver Assembly CRT AssemblyHP-IB Assembly Battery 3.0 V 1.2 A-HR Lithium If 1 Bottom Cable ASSEMBLY, A7/A8 Drive Power CABLE, RibbonCable Assembly Line Switch Cable ASSEMBLY, Speaker Cable ASSEMBLY, Coax 6, 0 Span Video Cable ASSEMBLY, A10 Rythm DriveCable ASSEMBLY, Coax 97, LO Sweep Cable ASSEMBLY, Coax Cable ASSEMBLY, SEMI-RIGID, RF Input Cable ASSEMBLY, SEMI-RIGID, 1ST LOCable ASSEMBLY, SEMI-RIGID, 1ST Mixer Cable ASSEMBLY, Coax 89, CAL OUT Parts Identification, Assembly Mounting Parts List, Cover Assembly SPACER, CRT TUBE, CRT Parts List, Main Chassis Parts List, RF Section Probe Power Jack Parts List, Front Frame00000 Keycap Line SCREW-MACHINE Assembly M3 X 0.5 12MM-LGRubber Keypad Includes Keycaps LED-LAMP LUM-INT=560UCD IF=SOMA-MAX Line Filter Module Parts List, Rear Frame5062-7755 3 1 Battery Holder Includes Wires Monofluoride \ \ ‘v’ FI c P3$CES ‘\‘\ Major Assembly and Cable Locations Major Assembly and Cable Locations A21OCXO FL3 not Assigned FL4 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 Pad Assembly Test PointsGeneral Troubleshooting Ribbon Cables @AMPLIFIER Ribbon Cable Connections 1 General Troubleshooting Ribbon Cable Connections 2 General Troubleshooting Service Cal Data Softkey Menus PKEq Service Cal Data Menu Troubleshooting to a Functional Section CRT Location of Assembly Troubleshooting TextSloda Rythm Loading the software TAM Test and Adjustment Module Data files and system mass storage files HP-IB addressesExecuting a test TAM Requirements Erroneous Results Test ConnectorsRevision Connectors Inconsistent Results ADC/lnterface Check Automatic Fault IsolationDisplay/Power Supply Controller Check LO Control Check Manual Probe TroubleshootingRF Low Band Check Calibration Oscillator Troubleshooting Mode RF Path Fault Isolation Viewing Multiple Messages Error Messages Error Message Elimination System Analyzer Programming Errors 100 to System ADC Errors 200 to 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 OFF Unlk Freq ACC YTO Loop Error Fractional N PLL MHz Reference LoopYTO Leveling Loop Sampling Oscillator Span Accuracy Calibration Errors 356 to YTO Loop Settling Errors 351 to Automatic if Errors 400 to RBW RBW 3K LIN Ampl LOG Ampl General Troubleshooting 7-3 General Troubleshooting Ampl 1M General Troubleshooting General Troubleshooting 300 MHz Digital and Checksum Errors 700 to System Errors 600 toEerom Checksum Errors 700 to ROM U306 ROM U307 ROM U308 ROM U309 ROM U310 ROM U311 Program ROM Checksum Errors 705 to Microprocessor Error 7 Battery ProblemModel Number Error RAM Check Errors 711 to Fast ADC Error System Errors 750 toOption Module Errors 800 to TG Unlvl User-Generated Errors 900 to Functional Sections General Troubleshooting Block Diagram Description A7 Sloda RF Section Al3 Second Converter A10 YIG-Tuned Filter/MixerSecond if Amplifier part of A15 Flatness Compensation Amplifiers part of AM Third Converter part of A15 YTO PLL A7, All, part of A14, part of A15 Synthesizer SectionSweeping the First LO Reference PLL part of A15 Offset Lock Loop part of A15 Phase Lock Loops Fractional N PLL part of A14 If Section A4 Log Amplifier/Cal Oscillator Assembly ADC/lnterface Section A5 if AssemblyLog Expand/Video Functions Triggering Controller SectionFirmware Al7 CRT Display Driver Display/Power Supply SectionA6 Power Supply Display ASMPage 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 A3 Test Connectors Troubleshooting Using the TAM ADC ASM ADC MUX Automatic Fault Isolation References TAM Tests versus A3 Test Connectors Keyboard Interface Keyboard/RPG ProblemsKeyboard Matrix RPG Interface Free RUN Video Line External Triggering or Video Gating ProblemsCounter Frequencies Trigger MUX Truth Table 10 ADC/lnterface Section Level Yiiqx5q 12 ADC/lntertace Section Preselector Peaking Control Real Time DAC ADC/lntefface Section Flatness Control RF Gain DACs 14 ADC/lnterface Section A3 Assembly Video Circuits Log Offset/Log Expand 16 ADC/lnterface Section Video MUX Video Filter Latch Outputs Video Filter Buffer Amplifier18 ADC/lnterface Section Positive/Negative Peak Detectors Select Desectdr POS Peak mode HMUX-SELO/l versus Detector Mode Peak Detector Reset20 ADC/lnterface Section ADC MUX Rosenfell Detector 22 ADC/lnterface Section Logic Levels at A3U108 Track and Hold Variable Gain Amplifier VGA ADC Control Signals A3 Assembly ADC Circuits24 ADC/lnterface Section ADC Start/Stop Control 26 ADC/lnterface Section ADC ASM Ramp Counter Analog Bus Drivers A3 Assembly Control Circuits28 ADC/lnterface Section Analog Bus Timing 30 ADC/lnterface Section Interface Strobe Select10. Demultiple er A3U410 Truth Table 1. Demultiple er A3U500 Truth Table Video Input Scaling Amplifiers and Limiter Al6 Assembly Fast ADC Circuits Option 32 ADC/lnterface Section Bit Flash ADC NEG Peak/Pit DetectionByte Static RAM POS 34 ADC/lntertace Section Al6 Assembly Fast ADC Control Circuits OptionCPU Interface and Control Registers 13. Control Word at Primary Address U3 and U4 Lloadaddr Vtrig POLLsample Ladcen 38 ADC/lnterface Section Reference ClockHswp Trigger Clock and Sample Rate Generator Bit 32 K Circular Address Counter Bit Post-Trigger Counter Video Trigger Comparator Page QEL--QWa5-w---w If -l If Section If Section A4 LOG AMP/CAL OSC Troubleshooting A5 with the TAM Troubleshooting the Log Amplifier with the TAM TAM Tests versus Test Connectors Ifdac Fdac Cal fist Troubleshooting Nude Troubleshooting the Cal Oscillator with the TAM Sweep Width Settings Automatic if Adjustment 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 If Gain Application Guidelines ATTEN=lO dB Linear Amplifiers Video Off set Frequency Counter Prescaler/Conditioner Video OutputAM/FM Demodulator MHz if Filters KHz if Filters MHz Vcxo KHz and 10.7 MHz if Filters LO Switch Input SwitchSynchronous Detector Log Off set/Gain Compensation A5 if Assembly KHz If Signature If Adjust Signature If Section Detailed if Adjust Signature LOG Ofysets 510 CjBm,-‘-ifTiN= dB 0 dBm II ill M P L E IIilI Common if Signature Problems L3klB 11. Region B Amplitude Variation 500 MHz Resolution Bandwidth Problems KHz and 10 kHz Resolution Bandwidth Problems KHz Resolution Bandwidth Problems Step Gains 15. Faulty Crystal Symmetry Cal Oscillator P/O A4 Assembly Inadequate CAL OSC Amptd Range Cal Oscillator Unlock at Beginning of if Adjust 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 -l Controller Section 2 Controller Section MSl, MS3 through MS6, MS8 Controller Section A2 Test Connectors Digital Signature Analysis DSA Display ProblemsLine Generators Line Generator Output Waveforms Blanking Blanking Waveforms 6 Controller Section Expanded Blanking Waveforms Display Jumbled or Trace Off Screen IO-8 Controller Section Switch Driver Waveform Lchar Distorted X/Y Line Generator Waveforms Bad Characters or Graticule IntensityLo-10 Controller Section Delta X Waveform Long Lines Dimmer Than Short Lines Lo-12 Controller Section Analog Zero-Span Problems Non-Option Controller Section lo Frequency-Count Marker Problems Gate Times Frequency CounterLo-14 Controller Section Controller Section lo-15 State- and Trace-Storage Problems Lo-16 Controller Section Keyboard ProblemsPage Synthesizer l-1 Synthesizer Section Synthesizer Section A21 Ocxo TAM Connector Pin Locations L. Measured Signal Line Location Al4 and Al5 Test Connectors 4 Synthesizer Section Synthesizer l-5 YTF 6 Synthesizer SectionDAC MS7 FAV MS8 MS2 MS5 MS6 MS7 OFLAGC MS1 MS2 MS3 MS4 MS6 MS8 MS5,MS7,MS8 YTO PLL Troubleshooting Test SetupConfirming a Faulty Synthesizer Section 8 Synthesizer Section Synthesizer l-9 Center Frequency Tuning ValuesCheck A3 ADC MUX Function Block steps Check A14J301 10 MHz reference input steps Check First LO steps Check Al4 frequency control assembly steps Synthesizer -l YTO Loop Test Setup Check Al5 RF assembly steps 12 Synthesizer Section 4. Sampler and Sampling Oscillator Test Setup Synthesizer General PLL TroubleshootingPLL Locked at Wrong Frequency Sampling Oscillator Test Frequencies PLL Locked at Wrong Frequency Synthesizer Section REF- \ Y Synthesizer l-15 Unlocked PLL Check 100 MHz VCXO, tripler, and doubler steps TroubleshootingUnlocked Reference PLL Operation Check phase/frequency detector steps Check 10 MHz reference to phase/frequency detector steps Check the 100 MHz lock loop integrator steps Check level at amplifier input steps Third LO Driver Amplifier 20 Synthesizer Section Unlocked Offset Lock Loop Sampling OscillatorCheck loop references steps 1 Check levels into mixer steps Sampling Oscillator PLL Divide Numbers Check path to phase/frequency detector steps Unlocked YTO PLL 7. Amplifier Polarities 7. Troubleshooting an Unlocked YTO PLL Synthesizer l-25 Troubleshooting an Unlocked YTO PLL 26 Synthesizer Section Check First LO pretune frequency and amplitude steps Check FM loop sense steps Check the fractional N oscillator stepsCheck sampler drive output of A7 Sloda steps Check sampler if steps Synthesizer Section Main Coil Coarse and Fine DACs Voltages Voltages in FM Coil and Main Loop DriversCheck main coil coarse and fine DACs steps Check main coil tune DAC steps 30 Synthesizer Section Confirming an Unlocked Condition Unlocked Fractional N PLL 10. Postscaler Divide Numbers Fractional N PLL32 Synthesizer Section Vco 1 1. Unlocked Fractional N Troubleshooting AreasVCO 0AT VOLTAGE-CONTROLLED Oscillator Synthesizer l-35 12. Divider and Integrator Troubleshooting 14. Harmonic Mixing Number versus Center Frequency Frequency Span Accuracy Problems13. Sweep Signal Destination versus Span Determining the First LO Span Synthesizer l-37 Confirming Span Problems 38 Synthesizer Section YTO Main Coil Span Problems LO Spans 20 MHzYTO FM Coil Span Problems LO Spans 2.01 MHz to 20 MHz 15. Settings of Sweep Switches Synthesizer l-39 Fractional N Span Problems LO Spans 52 MHz 40 Synthesizer Section First LO Span Problems All SpansCheck span attenuator steps Check current source steps 16. Settings for Switches and Comparators First LO Span Problems Multiband Sweeps 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 PLL Phase Noise Fractional N versus Offset PLL or YTO PLL Phase Noise Sampler and Sampler if Sweep Generator Circuit Set a microwave source to the following settings 10. Simplified Synthesizer Section JP/O a l Al5 RF 50 Synthesizer Section A21 OcxoPage Page RF Section RF Section Al4 and Al5 Test Connectors RF Section Automatic Fault Isolation References PIN Low Band Problems Low and High Band Problems High Band Problems A7 LO Distribution Amplifier ‘0 0 0 0 0 0 A8 Low Band Mixer A9 Input Attenuator Low RF Section Loda Drive Al4 Frequency Control AssemblyRF -l A7 First LO Distribution Amplifier Drive Control Latch for Band-Switch Driver YTF Driver Circuit HP 8582E Rear-Panel LO SWP Output FE RUI Pbbzl Offset Sweep + Tune Multiplier Values Confirming a Faulty Third Converter Al5 RF AssemblyConfirming Third Converter Output Third Converter Control Latches Flatness Compensation Control SIG ID Oscillator Option Q604 on MHz Reference 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 Al7 Test Connector TAM Tests versus Test Connectors Blank Display Using the TAM Blank Display Probe Power Socket Blanking Signal Display Distortion Focus Problems Intensity Problems Display/Power Supply -l Dead Power Supply A6 Power Supply Assembly TroubleshootingCheck the Supply Voltages Buck Regulator Kick-start/Bias Supply Restarting Every 1.5 Seconds Kick Start Line Fuse Blowing Buck Regulator Control Loop Low Voltage SuppliesHigh Voltage Supplies CRT Supply Dropping Out DC-DC Converter Control Buck Regulator Control Power Up Page Page Component-Level Information Packets A-l Component-Level Information Packets Component-Level Information Packets Table A-l. HP 8562 Spectrum Analyzer Documented Assemblies Component-Level Information Packets A-3 Table A-l. HP 8582 Spectrum Analyzer Documented AssembliesPage Index-l Ocxo AFI Index-2 Fadc Index-3 Index-4 Loda Index-5 Index-6 Index-7 Index-6