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HP 8719A, Service Manual

The HP 8719A, a high-quality electronic device, boasts excellent performance and precision. Unlock its full potential with the comprehensive Service Manual, available for download from manualshive.com for free. Enhance your user experience and maximize the functionality of your HP 8719A with this must-have manual.

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Summary of Contents for 8719A

Page 1: ...buy your excess underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stock Ready to ship TAR certified secure asset solutions Expert team I Trust guarantee I 100 satisfaction All trademarks brand names and brands appearing herein are the property of th...

Page 2: ...gilent website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You will find any other available product in...

Page 3: ...A 2914A HP 87208 3029A For additional information see InstrumentHistory section of this manual Copyright HEWLElT PACKARD COMPANY 1989 1400 FOUNTAINGROVEPARKWAY SANTA ROSA CA 95403 U S A MANUAL PART NO 08720 90108 MicrofichePart Number 08720 90106 Printed SEPTEMBER 1990 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 4: ... shall prepay shippingchargesto HPand HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programminginstructions when properly installedon that instrument HPdoes not warrant t...

Page 5: ...sulindamagetoordestruction of partoralloftheproductDonot proceedbeyondaCAUTIONsign until the indicatedc o n t i i s are fully understoodand met BEFOREAPPLYINQ POWER Verify that the productisconfiguredto matchthe availablemainpowersource perthe inputpower configurationinstructions provided in this man ual If this product is to be enernized via an auto transformer make sure the mmon terminal is conn...

Page 6: ...rformanceTest 26 Equipment 26 Description and Procedure 26 If the Instrument Failsthis Test 27 Dynamic Range PerformanceTest 28 Equipment 28 Description and Procedure 28 If the Instrument Failsthis Test 28 PerformanceTest Record 29 Option 003 PerformanceTest Record 30 ADJUSTMENTS Introduction 1 Order of Adjustments 1 Test Equipment 2 Instrument Cover Removal 2 A9 CC Correction Constant Jumper Posi...

Page 7: ...stems 2 TroubleshootingSystems with Multiple Peripherals 3 TroubleshootingSystems with Controllers 4 Overall Block Diagram 5 ISOLATE FAULTY GROUP Introduction 1 Power Supply 1 Digital Control 2 Source 2 Receiver 3 Accessories 3 Isolate Faulty Group Worksheets 5 POWER SUPPLY Introduction 1 LED State Definitions 1 Start Here 3 Fan 3 Power Supply Error Messages 3 Check A15 Preregulatorand Loads 3 Che...

Page 8: ... Generator Check 9 A l l Phase Lock Check 9 Band Related Problems 10 Check A l l YO Drivers 11 BroadbandPower Problems 13 A7 ALCISignal Separation Check 13 A69 Step Attenuator Check 13 A67 Power Splitter Check 14 A58 Modulator and A70 3 dB Attenuator Check 14 A51 InterfacePower Supplies 14 Measuring Lower Box Bias Voltages 14 RECEIVER Introduction 1 Start Here 1 All Signal Paths Look Bad 2 2nd LO ...

Page 9: ... Harmonic Comb 10 4 A64 R Sampler Down Converting the Signals 10 5 A l l Phase Lock Comparing Phase andFrequency 10 6 Tuning the YIG Oscillator 11 7 Phase Locked Sweep 11 A12 Reference the Crystal Reference Frequencies 11 Source Block The YIG Oscillator Signals 12 A7 ALC Automatic LevelingControl 13 Signal Separation 15 A67 Power Splitter A68 Attenuator 15 A69 Step Attenuator 15 S4 Transfer Switch...

Page 10: ... 20 To Removethe BiasTees 20 To Remove the Transfer Switch 20 To Reassemble 20 A69 Step Attenuator Replacement 21 Tools 21 Procedure 21 To Disassemble 21 To Reassemble 21 A51 Interface Replacement 22 Tools Required 22 Procedure 22 To Disassemble 22 To Reassemble 24 A53 Mixer Amplifier Replacement 27 Tools Required 27 Procedure 27 To Disassemble 27 To Reassemble 27 A55 YIG 1 A54 YIG 2 Replacement 2...

Page 11: ...ery six monthsor more often to ensurethat the instrumentis maintainedin goodworking condition Verificationconsists of three pa rts Operator sCheck a brief procedurethat tests all circuitsin the analyzer to verify with 80 confi dencethat the instrumentisfunctioning properly Itdoes notverify conformanceto specifications System Verification a procedure designed to verify system level error corrected ...

Page 12: ...al Service Key Menus documents the functions of the menus accessed from the SERYICE softkey These menus let the operator test verify adjust control and troubleshoot the ana lyzer All of the internaltestsandthe 23 analog busnodesaredocumentedhere HP IBservice mnemonics are included Error Terms can be powerfulpreventivemaintenanceandtroubleshootingtools besidesbeing the basis for accuracy enhancemen...

Page 13: ... 0 13 to 20 GHz Accuracy 3 ppm Freq 0 13 to 20 GHz Range 30 to 15 dBm Accuracy t0 05 dB Freq 0 13 to 20 GHz Range 30 to 20 dBm Resolution 10 mV Bandwidth 100 MHz CS80 protocol Raster graphics capability 3 5 mm connectors No substitute No substitute No substitute Recommended Model Use 1 The printer is not used for adjustments unless the optional Fractional N Spur and FM Sldeband Adjustment is being...

Page 14: ... after replacement of the A13 assembly but is NOT required Instrument Series 200 300 Controller BASIC 3 0 4 0 or 5 0 Spectrum Analyzer RF Cable BNC Cable 3 5 mm 9to Type N Adapter HP 8720A Automated Adjustment Software Critical Specs No substitute No substitute No substitute Type N connector No substitute Notes V Verification SystemVerification and PerformanceTests A Adjustments T Troubleshooting ...

Page 15: ...it devices Refer to the calibration kit manual for center pin recession specifications Ifthe connectorsaredirtyor damaged referto theMicrowaveConnectorCaremanual behindthe ConnectorCareandApplicationstab inthe OperatingManual That manualdetailsconnectorcare techniquesincludingcleaningandgaging connectors damage signs makinggood connections proper handlingand storage CHECK THE ERROR TERMS Error ter...

Page 16: ...he cal coefficients have been calculated press TRANSMISSION Connect a single cable or cable pair consistent with normal system use between ports 1 and 2 and press FWD TRANS THRU FWDMATCH THRU REV TRANS THRU RN MATCH THRU TRANS DONE 5 Connect loads to ports 1 and 2 or the cables consistentwith normal system use Press AVG IF BW I 0 xi to changethe IFbandwidthto 10 Hz Then press CALI RESUME CAL SEQUE...

Page 17: ...rly depends on the operating environment It is a good ideato check itweeklyandcleanit as necessary If the message CAUTION Air FlowRestricted Check Fan Filter isdisplayed immediately check for items like a piece of paper on the fan filter that may be impeding the air flow If the fan filter is not blocked clean it as follows 1 Turn OFF the instrumentand disconnect the HP IB cables from the rear pane...

Page 18: ...ngernail betweenthe upper left corner of the softkeyscover andthe glassfilter see Figure1 Beextremely careful notto scratchor break the glass Carefully pull the cover forward and off Display Bezel III CAREFULLY INSERT A S R L L THIN FLRT SCREYDRIVER BLRDE OR FINOERMRIL HERE rSoftkeys Cover iScrew one Behind of two Cover Figure 1 Removing the Glass Filter 3 Removethe two screws that are now uncover...

Page 19: ...T1 and OPCK PORT2 A short is connectedto port 1 port 2 to reflect allthe source energy back intothe analyzerfor an S11 S22 measurement Thefirst partof OPCK PORT1 checksthe repeatabilityof thetransfer switch An S11measure ment is stored in memory and the switch is toggled to port 2 and then back to port 1 where another S11 measurement is made The difference between the memory trace and the second t...

Page 20: ... the end of the subtests the test title and resultwill be displayed If alltests passsuccessfully the overalltest statuswill be PASS If any testfails the overall test status will be FAIL Next runthe test for port 2 pressthe step r key The display should show TEST 22 Op Ck Port 2 in the active entry area Repeat steps 4 through 7 If both tests pass the analyzer is about 80 verified If either test fai...

Page 21: ...keys Referto DISPLAY Key inChapter4 of theReference andDisplayIntensityandFocusCorrectionConstantsin the Adjustments section Symptom Self test fail message is displayed on the CRT immediately after power on or preset Solution Contact a qualified service technician Symptom Phase lock error message Is displayed this includes the PHASE LOCK CAL FAILED message Solution Contact a qualified service tech...

Page 22: ...nter plotterdoes not respondto front panel commands Solution Check the addressof the printeror plotter Makesurethe analyzer is setto SYSTEM COMROUER under the LOCAL key Symptom CAUTION Air Flow Restricted Check Fan Filter message is displayed on CRT Solution Check if anything is blockingthe fan Clean the fan filter refer to the RoutineMainte nance information in this manual 4 Verification HP 8719a...

Page 23: ...ssesthe verificationat allfrequencies as well asthe performancetests aCertificateof Traceabilityis issued VERIFICATION KIT A verificationkit is used in the following procedureto verify that the network analyzer system is working within its specifications and that you have performeda valid measurementcalibration The kit consists of two attenuators a 25Q mismatchairline a 50Q airline a data disc con...

Page 24: ...asurement system after accuracy enhancement The systematic errors are directivity source match load match reflection and transmission fre quency tracking and isolation crosstalk Random errors includeerrors due to noise drift con nector repeatability and test cable stability A complete description of system errors arid how they affect measurements is provided in the Reference section of the Operati...

Page 25: ...tion kits with serial number prefix 2815A and higher provide a data disc compatible with the HP 87208 and HP 8719A Kits ordered previous to the 2815A serial prefix or HP 85051A and 85053A verification kits can be upgraded by recertifying the kit through a local sales and service office Description Calibration Kit Verification Kit Cables PRINTER WETYORK RNRLYZER DISC DRIVE W COHNECTOR b bFEYKE CONN...

Page 26: ...out of all verification data for all devices is required press SYSTEM SERWCE MENU p S 7 OPnONS RECORDON All results will be printed Note that if this record function is turned on now it cannot be turned off during the verification procedure Make sure the paper in the printer is set up so that printing starts at the top of the page Press SYSTEM SERVICE MENU TESTS SYS VER TESTS The message TEST 26 S...

Page 27: ... end of test port 1is male and the device end of test port 2 is female This will ensure that the verificationdevices are correctly inserted YETYORC AYRLTZER Rgure 2 T Port Cabling 10 Press CALI CAL COT and select the type of cal kit to be used Then press pE7WRN CAUBRATE MENU FULL 2 PORT3 REFLECPN 11 Connect the open circuit to the port 1 cable Press Sll OPEN If calibrating in type N connectthe fem...

Page 28: ...her BROADBAND or SUDING dependingon which device is used If you select SUDING you mustalso meas ure a lowband load to complete the loads calibration 22 Whenthe measurementis complete press DONE LOADS Leavethe loadconnectedto the port 2 cable 23 Press REFLECPN DONE 24 After the calibrationcoefficientsarecomputed the 2 portcal menuis returnedto the screen 25 Press ISOLATION FWD ISOL N ISOL N SlD RNI...

Page 29: ...nting starts at the top of the page 39 Press EXECUTE TEST NOTE When printing test results press FORM FEED on the printer to create page breaks in appropriate places 40 When prompted insert the 20 dB attenuator ConnectingDevice When measuring 3 5 mm devices connect the female end of the device to the port 1cable When measuring 7 mm devices connect the A end of the device to the port 1cable With the...

Page 30: ...ine x x 47 The printout of the measurements shows both a plot of the measurement and a list of the measured frequencies with corresponding data The plot includes both the measureddata traceandthe suppliedfactory data trace The listingincludesonly the measureddata If there is a failure at any frequency an asterisk will be next to the measured data and the out of specificationmeasureddata on the plo...

Page 31: ... tor istowardthe endof the outer conductorwithoutthe connectornut leavethe protectivecapon the maleendof the outer conductorto preventthe center conductor from falling out of the outer conductor Replacethe protectivecap on the female end of the airline untilyou are ready to use the airline Follow the exact sequenceof steps when connecting these devices Be especially careful not to drop either the ...

Page 32: ...er conductorjust enough to be able to holdthe center conductor with two fingers while holdingthe outer conductor with the other hand Guide the center and outer conductorsto the malecablefor an in lineconnection Matethe female end of the airline center conductor with the center conductor of the cable connector 3 Connect the outer conductor of the airline to the outer conductor of the cable connecto...

Page 33: ...terconductorof the airline does not disengage from the cable center conductor gently pullthe airlinecenter conductor from the cable center conductor and pushthe airline center conductor back inside the outer conductor of the airline 2 Remove the cable from the other end of the airline If the airline will not be used again immediately slide the center conductor out of the outer conductor and store ...

Page 34: ...tingthese devices Be especially careful not to drop either the center conductor or the outer conductor when handling these airlines Irreparable damage will result if these devices are dropped Connect the airline as follows 1 Fully retract the threads on the port 1 cable connector NOTE This procedure refersto the A end of the airline as the end closest to the H in the HP logo on the label of the ou...

Page 35: ...tip emerges from the A end of the airline 5 lnsert the tip of the center conductor emerging from the A end into the cable center conductor Figure 6 Mate the outer conductors of the airline and port 1cable connector finger tight 6 Gently removethe cap from the 8 end of the outer conductor Fully retractthe threads on the port 2 cable 7 Align the center conductor of the port 2 cable connector with th...

Page 36: ...tating by hand To disconnect the airline 1 Remove one cable from the airline and replace the plastic cap on the airline to prevent the center conductor from sliding out of the outer conductor 2 Remove the cable from the other end of the airline If the airline will not be used again immediately slide the center conductor out of the outer conductor and store the center conductor inthe plasticcase pr...

Page 37: ...leend Rgure 8 Alrlfne C2nter ConductorHacement Follow the exact sequence of steps when connecting these devices Be especially careful not to drop either the center conductor or the outer conductor when handling these airlines Irreparable damage will result if these devices are dropped Connect the airline as follows 1 Always connectthe female endof the center conductorfirst Removethe protectivecapf...

Page 38: ...e cable adapter Pushthe airline sfemale coupling sleeve forward and turn the adapter nutto mate the outer conductor of the airline with the adapter Hand tighten this connection To connect the male end of the airline align and insert the male end of the airline center conductor into the female end of the cable adapter and mate the outer conductors Hand tighten this connection 20 Verification HP 871...

Page 39: ...he maleend of the airlineand replacethe plasticcap onthe airlineto preventthe center conductor from sliding out of the outer conductor 2 Disconnectthe other end of the airline If the airlinewill not be used again immediately slide the center conductor out of the outer conductor and store the center conductor inthe plastic case provided Replacethe other plasticcap ontheouter conductorand storethe c...

Page 40: ...reManual HP part number 08510 90064 contains specific informa tion on the use cleaning mating and gaging of 3 5mm connectors as well as precision 7 mm SMA and type N connectors Make surethat the test equipment usedineachtest meetsits own published specificationsand that all connectors are clean The table of Service Test Equipment in the Service and Equipment Overview section lists the necessary eq...

Page 41: ... verificationand performancetests IF THE INSTRUMENTFAILS A TEST Refer to If The Instrument Fails This Test at the end of each performance test for trou bleshootinghints and references to other manual sections to help resolveany problems 24 Verification HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 42: ...the frequency counter reading on the Performance Test Record 3 Repeatstep 2 for each of the instrument frequencies listed on the Performance TestRecord IF THE INSTRUMENT FAILS THIS TEST If any frequency measured is close to specification limits either in or out of specification check the time base accuracy of the counter used If the analyzer fails by a significant margin at all frequencies especia...

Page 43: ...ction for specifications Warm up time 30 minutes 1 Zero and calibrate the power meter Set the cal factor on the power meter to the average value of the power sensor between 0 13 and 20 GHz For example if the power sensor cal factor is 100 o at 0 13 GHz and 92 at 20 GHz set the cal factor to 96 2 Connect the power sensor to port 1 of the analyzer as shown in Figure 12 3 On the analyzer press PRESET...

Page 44: ...atepower reflectionsand causethe analyzer to appear to be out of limits Repeat the measurement at port 2 press MEAS Rd RN S22 to drive port 2 Marginal failures especially at the high or low end may be due to the power sensor cal factor approximation method of step 1 A cal factor approximation of r4O 0 as in the above example induces an error of about 0 15 dB To eliminate the cal factor approximati...

Page 45: ...HING ON SMOOTHING APER7WREI I 2 xl When the measure ment has been averaged sixteen times press MKR and use the knob to determine the maximum points in the frequency bands listed in the Performance Test Record Record the S21 maximum points there NOTE To emphasizethe frequency bands press MKR I 5 G n MARKER 21 2 Gln MARKER 31 Then move marker 3 with the knob to find the maximum points in the three f...

Page 46: ...7 000 MHz 1 0 GHz 2 0 GHz 3 5 GHz 5 0 GHz 8 0 GHz 10 0 GHz 13 5 GHz 15 0 GHz 20 0 GHz Power Level 0 999 990 GHz 1 999 980 GHz 3 499 965 GHz 4 999 950 GHz 7 999 920 GHz 9 999 900 GHz 13 499 865 GHz 14 999 850 GHz 19 999 800 GHz 1 000 010 GHz 2 000 020 GHz 3 500 035 GHz 5 000 050 GHz 8 000 080 GHz 10 000 100 GHz 13 500 135 GHz 15 000 150 GHz 20 000 200 GHz Specification 10 dBm 3 dB across frequency ...

Page 47: ... 0 GHz 3 5 GHz 5 0 GHz 8 0 GHz 10 0 GHz 13 5 GHz 15 0 GHz 20 0 GHz 0 999 990 GHz 1 999 980 GHz 3 499 965 GHz 4 999 950 GHz 7 999 920 GHz 9 999 900 GHz 13 499 865 GHz 14 999 850 GHz 19 999 800 GHz 1 000 010 GHz 2 000 020 GHz 3 500 035 GHz 5 000 050 GHz 8 000 080 GHz 10 000 100 GHz 13 500 135 GHz 15 000 150 GHz 20 000 200 GHz Power Level Specification 10 dBm k 3 dB across frequency range port 1only ...

Page 48: ...res A9 CC Jumper Position Procedure HP 8719A 20B Display Positionand Focus Adjustments HP 8719A 20B Display Degaussing Demagnetizing HP 8719A 20 Display lntensityAdjustments HP 8720A Display lntensity and Focus CorrectionConstants Serial Number CorrectionConstant Option Numbers CorrectionConstant Analog Bus Correction Constants IFAmplifier Correction Constants ADC Linearity CorrectionConstants Sou...

Page 49: ...ine maintenance A9 CC CORRECTION CONSTANT JUMPER POSITION Move the A9 CC jumper as explained below to the ALTER position to change correctioncon stants The instrument is shipped and should be operated with the A9 CC jumper in the NOR MAL position 2 Adjustments HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 50: ...nof the instrumentisshownonalabelonthe under side of the top cover Removethe A9 CPU assembly and movethe A9 CCjumper to the ALTER position see Figure 1 3 Replace the A9 assembly and run the correction constant routine s 4 Return the A9 CC jumper to the NORMAL positionwhen finished NOTE Updatethe EEPROMbackupdisk by performingthe EEPROM backupdisk procedure HP 8719 and HP 8720 Adjustments 3 Artisan...

Page 51: ... Vertical PositionAdjustment 1 To access verticalandfocus adjustmentscontrols removethe side panelnearestthe display FOCUS ADJUSTMENT CONTROL ADJUSTMENT CONTROL Figure 2 VerticalPosftionAdjustmart Contrd 2 Insert a narrow preferably non conductive flat head screw driver at least 2 inches long into the vertical position hole 3 Adjust the control until the softkey labels are alignedwith the softkeys...

Page 52: ...ions keeping in mind the following it is imperative that atfirst itbe placednocloserthan4 inches 10cm from the face of the CRTwhiledemagnetiz ingthe display Ifthis distance istoo far to completelydemagnetizethe CRT try againat a slightly closer distance untilthe CRT is demagnetized Applying an excessively strong magnetic field to the CRT face can permanentlydestroy CRT Like mostdisplays the CRT ca...

Page 53: ...ab Check that the jumper on A9 CPU is in the ALTER position 2 In a dimly lit room or with the analyzer CRT shaded from bright lights press PRESET SYSTEM SERVICE MENU softkey 8 TESTS softkey 1 45 xl 3 The CRT should display Intensity Cot ND NOTE The display could be so far out of adjustmentthat the annotationwill be very difficultto read 4 Press EXECUTE Em softkey 1 and YES softkey 2 at the prompt ...

Page 54: ... analyzer CRT should have an all white screen Center the photometer on the analyzer CRT as shown in Figure x Adjust the analyzer front panelknobto the maximum clockwise position Ifthe photometerregistersgreater than150 NITs SO turn the front panelknob untila readingof no morethan 150NITS 90 registerson the photometer If the photometer registers a readingof less than 150 NITS 90 and greater than 10...

Page 55: ...gure3 Adjust the analyzer front panelknobuntilthe photometerregisters100NITSof output light if the glass bezel assembly is not installed Adjust for 60 NITSif the glass bezel is installed 11 Press the top softkey on the analyzer and observe the CRT DONE displayed the adjustment isdone Referto the EEPROM BackupDisk Procedure to store the new correctionconstants This completes the series of three Dis...

Page 56: ...FF BEEP DONE ON off BEEP WARN on OFF r n N S m l FWUS 2 Press INTENSTTY fourth softkey from the top and rotate the RPG knob clockwise to increase the intensity of the display counterclockwise to decrease 3 Press FOCUS fifth softkey from the top and rotate the RPG knob for best focus The intensity and focus adjustmentsare slightly interactive 4 Press SYSTEM SERVICEMENU m S T S 4 S 1x11 When the CRT...

Page 57: ...and cor rect press DONE Mistakes cannot be corrected after step 3 is performed 3 Press SYSTEM SERVICEMENU TESTS 4 9 1x11 Whenthe display shows Serial Cor press EXECWE Em Press YES at the query to alter the correction constant 4 To check the serial number recognized by the instrument press DISPLAY MORE 1 The number displayed in the title area of the CRT upper left should be the instrument serial nu...

Page 58: ...gh 4 only if 1 the instrumenthas option 001or 010 or both AND 2 the A9 CPU assembly has been replaced AND 3 the serial number correctionconstant procedurehas been performed NOTE Perform step 5 after steps 1through 4 if applicable to add option 003 to the A9 CPU EEPROM 1 Remove the top cover of the instrument Check the A9 CC jumper position it must be in the ALTER position Notethe registrationnumbe...

Page 59: ... jumper was not in the ALTER positionor the registration number entered did not conform to the requiredformat In either case confirm that the A9 CC jumper is in the ALTER position and repeat this procedure Contact HP if the procedure still does not end with DONE 5 To reactivate option 003 the A9 CC jumper must be in the ALTER position Turn on the analyzer and press SYSTEM SERVICE MENU PEEKIPOKE PE...

Page 60: ...efer to DigitalControl IF Amplifier Correction Constants EQUIPMENT RF cable HP 85131C D E F DESCRIPTIONAND PROCEDURE These correctionconstantscompensatefor possiblediscontinuitiesof signals greater than 30 dBm Warm up time 30 minutes 1 Check A9 CC jumper position Press PRESET SYSTEM SERWCEMENU 5 3 T S 4 7 xl andthen press EXECUTETEST when IF StepCor appears PresspES atthe query to alter the correc...

Page 61: ...tes 1 Check A9 CC jumper position Press PRESET SYSTEM SERVICEMENU PSTS 4 8 xl When the CRT displays ADC Ofs Cor press EXECUTE TEST 2 Connectthe RF cable between ports 1and 2 see Figure5 Press YES at the query to alter the correction constants 3 If this procedure did not end with DONE refer to Digital Control 14 Adjustments HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 8...

Page 62: ... CRT dis plays Pretune Adj press EXECUTE TEST PressW S at the query to alter the correction constants 2 When the prompt Set source to 2 145 GHz then continue appears use the RPG knob to adjust the frequency of the analyzer source to within 5 MHz of 2 145 GHz 2 140 GHz to 2 150 GHz The measuredfrequency will vary with the SRC DACtune number Press COHnNUE when the frequency is set 3 When the prompt ...

Page 63: ...p disk and keep it current Store the correction constant data to the EEPROM backup disk each time a correction con stant routine is performed Retrieve correction constant data from the EEPROM backup disk if the A9 assembly is replaced How to Make an EEPROMBackup Disk and Store Correction Constant Data to It 1 Connectthe instrumentsas shown in Figure7 and turn them on Makesure the drive is set to H...

Page 64: ...urn on the instruments If the analyzer display is dark press DISPLAY M O W bottom softkey NTENSTr fourth softkey from top and then turn the RPG knob If the display is unfocused press DISPLAY M w bottomsoftkey FOCUS fifthsoftkey from top and then turn the RPG knob See Display Intensity and Focus Correction Con stants for more information NOTE Disregard noisy trace data or error messages on the disp...

Page 65: ...e display appears as described above no adjustments are required Otherwise turn off the HP8720A remove the A9 CPU assembly pivot open the instrument and turn it on again 3 Make the following adjustments Reference Designator Adjustment escription A18A1R110 Y gain Adjust for a 12 cm 4 75 in high display A18A1R105 Y position Adjust to vertically center image A18A1R87 X gain Adjust for a 17 cm 6 75 wi...

Page 66: ... step 2 See Figure 9 Otherwise install the A12 assembly on the extender Use SMB cables as required the EXT REF cable need not be reconnected now 2 Press PRESET SYSTEM SERVICEMENU INPUTPORTS ANALOGBUSON I 5 xl to display VCO Tune 3 Press MKR and SCALE REF SCAf E DIV I 5 1x11 4 Adjust VCO TUNEwith a non metallicadjustmenttool to O OV r500 mV withinone divisionof the reference line The adjustment is ...

Page 67: ...ter input see Figure6 Press PRESETJ WENU1 CWFREQl 11 31 1 51 Glnl 2 If the measured frequency is 13 5 GHz 135 kHz no adjustment is necessary although the instrumentcan easily be adjusted much closer 3 Otherwise locatethe A12 assembly redextractors andadjustVCXO ADJ see Figure10 for a frequency counter reading as close to 20 GHz as possible It must be within k200 kHz 4 If you are unable to adjust t...

Page 68: ... dB reference line option 003 27 dB within27 dB of the reference line b Press START I 3 O Mlu AVG IF BWl I O O xl to set the start frequency and bandwidth Remove the RF cable and connect a 50 ohm termination at each port Press SCALE REF 2 O xl REFERENCEVALUE I 7 O xl to rescalethe CRT c Press AVG AVG FACTOR 3 2 xl AVERAGING ON MKR FCTN MRK SEARCH SEARCH MAX After 32 sweeps have been averaged the m...

Page 69: ...e If the readings in steps 3a or 3c are not as specified replaceA66 R Sampler Check 4 To check the R sampler A64 internal perform steps 2a and 3a the first part of the A sampler and B sampler check If both readings are not as specified replaceA64 22 Adjustments HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 70: ...ab Turn on the instrument and press PRESETI SYSTEM SERWCE MENU ALC OFF MENU CW FREQ I I 3 G n to lock the ALC circuit and enter CW mode 2 Zero and calibratethe power meter Connect the power sensor to port 1of the analyzer Set the cal factor of the power meter to the value of the power sensor for 0 13 GHz NOTE If phase lock error messages appear adjust ALC OFF fully clockwise see Figure 14 3 Rotate...

Page 71: ...eak below 2 GHz column 1 is within 0 5 dB of the greater power peak above 2 GHz column 4 no adjustment is required Continue with the following automatic levelingcontrol adjustment Power Level 4 dBm dBm Frequency 3 GHz GHz Power Level Otherwise reset the analyzer to the frequency of the greater power peak below 2 GHz col umn 3 Frequency 5 GHz GHz Before 1 dBm dBm 6 Adjust LEVELADJ see Figure13 to w...

Page 72: ...n 2 8 Ultimately the maximum power level below 2 GHz must be within 0 5 dB of the maximum power levelabove 2 GHz as shown in Figure12 When adjusted perform the followingauto matic leveling control adjustment If you are unableto performthis adjustment as specified suspectthe A53 mixerlampand A58 modulatorassemblies Refer to Source for troubleshooting help HP 8719 and HP 8720 Adjustments 25 Artisan ...

Page 73: ... in the previous procedure Set the cal factor on the power meter to the value indicatedby the power sensor Adjust ALC OFF see Figure14 for a power meter reading of 7k0 1 dBm CRT ALC Off ALC On TOP ADJ ADJ Front Figure 14 Location o f Automatic Leveling Contrd Adfustmazts 2 On the analyzer press 6 I S G n SYSTEM SERVICE MENU ALC ON to reset the frequency and turn on the ALC Adjust ALC ON see Figure...

Page 74: ...HP8566A B RF cable 8120 4780 part of HP11851Bcable set 3 5 mm f type N 9 adapter 1250 1745 Diskdrive HP9122S D Automated adjustment software disk 08720 10002 Controller HP 9000 model 216 220 226 236 or 310 Printer HP2225A HP lB cable 4 HP10833A B C D BNC cable 8120 1840 HP 8719 and HP 8720 Adjustments 27 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 75: ...ment as shown in Figure 15 2 Make sure the instruments are set to their default HP IB addresses Disk drive 00 Printer 01 Network Analyzer 16 Spectrum analyzer 18 3 Load the BASIC operating system and the required binaries ERR GRAPH 1 0 KBD MAT MS CS80 HPlB and CRTA 4 Insertthe automated adjustment software disk into the disk drive type LOAD CIP I ADJn and press ENTER or RETURN on the controller 5 ...

Page 76: ... composite plot is out of specification repeat the adjustment If the composite plot can not be adjusted satisfactorily replace A13 Cal Kit Defaults Correction Constants DESCRIPTIONAND PROCEDURE This procedure loadsthe default calibration kitdefinitionsfrom ROM into EEPROM These math ematical device models matchthe characteristics of the HP 85052B D3 5 mm 85050B D 7 mm and 85054B D type N calibrati...

Page 77: ...PRESET CALI CAL KIT 3 5mm CAL KIT N SOQ MODIFY N SOQ then DEFINE STANDARD 2 XI STDTYPE OPEN a The correctvaluefor this capacitanceshouldbe 88 31 x 10 IsF If the capacitance value is wrong continuewith the next step 2 Store the EEPROM to disk by performing the EEPROM Backup Disk Procedure in the Adjustments section This is important If you makemistakeswhile peekinglpokingin memory you may need to r...

Page 78: ...d 88 31 x 10 l5 F If the capacitance value is wrong repeat steps 4 and 5 to poke the values in again and then repeatthis step to verify 7 Restore the A9 CPU jumper to the NORMAL position 8 Now that the EEPROMcontains the correct values make a backup copy of EEPROM again HP 8719 and HP 8720 Adjustments 31 32 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific ...

Page 79: ...te section These first sections Troubleshootingand lsolate Faulty Group stress simple straight forward procedures Eachof the five sections following IFGverifies one at a time the assemblieswithin a group until the faulty assembly is identified These five sections employ more lengthy complicated pro cedures A systemfailure can becaused by a problem inthe network analyzer and its accessories cables ...

Page 80: ...oblem persists and the analyzer does NOT use HP IB TROUBLESHOOTINGHP IB SYSTEMS Check the network analyzer s HP IB functions with a known working passive peripheral like a plotter or printer or disc Connect the peripheral via a good HP IB cable to the analyzer Press LOCAL SYSTEM COWROLLER to enable the analyzer to control the peripheral Then press SET ADDRESSES and the softkeys to see the device a...

Page 81: ...e Make sure the drive has power an initialized disc in the correct drive andthe proper disc unit number andvolume number press LOCAL to see default is 0 O With hard disc Winchester drives make sure the configuration switch is properly set see drive manual Press START 2 Gln SAVE STORE TO DISC STORE FILE 11 Then press PRESET RECALL LOAD FROM DISC LOAD F I E I If the resultant trace starts at 2 GHz H...

Page 82: ... User s Manual Select code see BASIC User s Manual 1 1 0and HP I6 binaries loaded see BASIC User s Manual Compatibility must be HP9000 series 200 300 see System Overview HP 16 cables see limits in User s Guide Programmingsyntax see the HP ISProgrammingGuide If the analyzer appears to be operating unexpectedly but has not completely failed go to the IsolateFaulty Group section 4 Troubleshooting HP ...

Page 83: ...F i w 3 Option 0 0 3 Padial Block Diagram HP 8719 and HP 8720 Troubleshooting 718 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 84: ...eto Table 1 the Functional GroupAssemblies and Equipmenttable which lists by functional group all of the assembliesand the associated service equipment POWER SUPPLY Turn on the instrument 1 Check to seethat the fan isoperatingproperly the fan hastwo speeds Itisnormalfor the fan to runat high speed when the instrumentis first turned on and then change to low speed There after fan speed changes cont...

Page 85: ...messages are present a Referto Table1 at the endof this sectionto seethe associatedassemblies and required equipment b Go to the Source troubleshootingsection to Continuetroubleshooting 10 Connect a power sensor to port 1 Press MENU CW to check power at 1GHz and then press A repeatedlyto check power at 2 5 10 and 20 GHz HP 8719 2 5 10 and 13 5 GHz The power should be between 13 dBm and 7 dBm Press...

Page 86: ...le Figure lb If any input shows unexpectedresults refer to Table 1for the associated assembliesand equip ment required Then go to the Receiver troubleshooting section Otherwise proceed to Accessories Figure 1 Typical InputA and B Tmce ACCESSORIES If the instrumenthas passedall of the above checks but is still making incorrect measurements probably either the cables or the calibration kit devices a...

Page 87: ...2 Reference A13 Fractional N Analog A14 Fractional N Digital A52 Pulse Generator A53 Source MixerIAmp A54 YIG 2 A55 YIG 1 A57 Cavrty Oscillator A58 Modulator A59 Isolator A60161 Bias Tee A64 Sampler A67 Power Splitter A68 10dB Attenuator A69 Step Attenuator A70 3 dB Attenuator S1 2 3 MicrowaveSwitch A41516 Second Converter A10 Digital IF A62163 Coupler A65166 Sampler DVM 0 Power Meter 4 Isolate Fa...

Page 88: ...oggle 0 5 CRT bright and focused 0 6 Press SYSTEM SERVICE MENU TESTS I XI 0 EXECUTE TESTS PRESET pass 7 Press 0 XI EXECUTE TESTS ALL INT tests pass 0 8 Press I 9 xl EXECUTE TESTS ABUS pass 0 If any NO boxes are checked see Table 1 then Digital Control SOURCE Press PRESET 9 Does the instrument phase lock is the display free of 0 phase lock error messages If NO see Table 1 then Source 10 Does the CW...

Page 89: ...Receiver ACCESSORIES If the instrument has passedall of the above tests all YES boxes checked but is still making incorrect measurements the problem is most likely with the cables or calibration kit devices Refer to the Accessories section NOTE Following assembly replacement refer to the RelatedService Procedures table in the Post RepairProcedures section The table specifies accessory adjustment a...

Page 90: ...rt Here A15 preregulator and loads A8 post regulator and loads LED State Definitions LEDsmayturnon or off blink or flash Butwithin this section they aredescribedas beinginonly two states ON Bright and steady normalgreen LED state abnormal red LED state OFF No light at all abnormal green LED state normal red LED state Hazards are involved in power supply troubleshooting It should be per formed only...

Page 91: ...Power Supply Troubleshooting Flowchart P CHECK M UONE w 2 Power Supply HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 92: ...speed or not working refer to Fan Troubleshooting page 9 Air Flow Restricted Check Fan Filter Clean the fan filter For best air flow and cooling operate the instrumentwith all of the covers in place Ifthe problempersists continuewith Check A15 Preregulatorand Loads next Power SupplyShut Down One or more supplies on A8 has been shut down due to overcur rent overvoltage or undervoltage Continue with...

Page 93: ...5 red LED is OFF reinsert the assembliesone at a time starting with A8 until the A15 red LEDisON disregardthe A8 green LEDs Replacethe assemblythatturns ONthe A15 red LED If the A15 red LEDis not OFF with A8 to A14 removed reinsertA8 to A14 and then removethe remaining 5V loads one at a time inthe order shown below untilthe A15 red LEDgoes OFF A51 DisconnectW12 the ribbon cable going from A17 to A...

Page 94: ...A65 A sampler A64 R sampler A69 step attenuator A53 A57 mixer amp and cavity oscillator A55 YIG 1 2 8 GHz A54 YIG 2 8 20 GHz at A51J3 at A51J4 at A51J15 at A51J14 at A51J16 at A51J2 at A51J9 at A51J10 at A51J11 ReconnectW12 and observe the A15 red LED A15 red LED OFF replace the cables one at a time Replacethe assembly that turns ON the A15 red LED A15 red LED not OFF check the A51 interface assem...

Page 95: ...Disconnectplugto measurevottages A15W1P1 Voltages 22 4 to 33 6 22 4 to 33 6 N C 9 4 to 14 9 4 to 14 32 to 48 N C FromA15 preregulator Al5W1P1 Disconnectplugto measurevoltages Figure 2 Vdtoges a t Al5WlPl CHECK A8 POST REGULATOR AND LOADS ReconnectA15W1 If allof the A8 post regulator green LEDsare not ON go toA8 LEDsAreNotAll ON Otherwise if the A15 red LED is still not OFF continue Number of A8 gr...

Page 96: ...le Check Assemblies Loading 7 5V Supply Remove the A9 A10 A12 A13 and A14 assemblies A15 red LED OFF reinsert the assemblies one at a time until the A15 red LED goes ON disregardthe A8 green LEDs Replacethe assembly that turns the LED ON A15 red LED not OFF eitherthe A8 post regulator or the A17 motherboardis faulty check them for shorts and solder bridges Refer to the Power Supply Block Diagram F...

Page 97: ...continue ReconnectYIG2 All A8 LEDsON reinsertthe assembliesone at atime and replacethe assemblythat produces the LEDs not all ON condition All A8 LEDs not all ON reinsert the assemblies and continue Check Lower Box Assemblies DisconnectW12 the A51 ribbon cable and turn on the instrument All A8 LEDs ON reconnectW12 and disconnectthe cablesto these loads A60 A61 S4 A52 A66 A65 A64 A69 A53 A57 A55 an...

Page 98: ... for solder bridges and shorted traces especially the traces that carry the supplies whose LEDs faulted when A8TP5 was grounded earlier NOTE This isthe endof the troubleshootingsequence The followingproceduresare branches of the preceding sequence and other sections The fan anddisplay in monochrome instruments as well as other assemblies share the 18 volt supplies from A15 MeasureA8 Fan Voltages R...

Page 99: ... faulty at A18 The A15 rear panel red LED is OFF and the green LED is ON and 0 All ten A8 green LEDs are ON If these assumptionsare false go back to the beginningof Power Supply Verify A8 Display Voltages Remove A8 from the motherboard but keep A15W1 connected Remove the W42 display power cable and short A8TP3 AGND to chassis ground with aclip lead Turn the instrumenton Refer to Table 1and Figure5...

Page 100: ... Step 3 bad do step 4 good replace A8 bad replaceA15 good replace A8 bad replace A15 Voltage Range I Observation Action 14 5V to 15 5V bad disconnect A15W1 and do Step 4 14 4V to 15 6V good replaceA8 bad replaceA15 good replace A8 bad replace A15 good replaceA8 bad replaceA15 bad disconnectA15W1 and do step 5 4 9V to 5 3V Suspect cable W42 if the voltage is good at A8 I bad do step 6 HP 8719 and H...

Page 101: ...6 2 kF yJ f j f3q 2 u r n 5 6 7 8 0 0 10 0 A1m nlJ0 RUO HP 8719A and HP 87208 A8 Post Regulator Assembly 15MSP 5VD 1 9 15V 5 W 6V lV U to 15 6 V 9 to 5 3 1U V to 15 6 lU V to 15 6 5 to 5 U 5 8 to 6 2 Sm6 7 8 0 RUO HP 8720A A8 Post RegulatorAssembly Figure 5 A8 Post RegulatorT e s tPOW Voltages 12 PowerSupply HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www...

Page 102: ... the voltages at AlSWlPl seeFigure 6 HP 8719A HP 87208 A1SW1P1 Pin Mnemonic Voltage FromA15 preregulator A15WlPl Disconnectplug to measure voltages HP 8720A A1SW1P I From A15 preregulator Pin Mnemonic Voltage l 2 18V 22 4V to 33 6V 3 4 18V 22 4V to 33 6V 5 Nld A15 WPI 6 Ow 9 4V to 14V Disconnectplugto 7 8 8 4 9 4V to 14V measure voltages 9 25 32V to 48V 10 N C Fipz 6 A15WIPl Voltages correctvoltag...

Page 103: ... phase lock problems can interfere with tests and adjustments If this seems to be the case press SYSTEM SERVICE MENU SERVICE MODES SOURCE P K OFF to eliminate the phase lock interference Press SYSTEM SERVICE MENU W S T S I 9 xl EXECWE TEST to run the abus test again If it fails replace the A10 assembly and return to Isolate Faulty Group If it passes return to Isolate Faulty Group Fatal Errors If t...

Page 104: ...ch for the following sequence 1 The RUN LED turns on 1 2 4 2 The 1 2 4 LEDs perform a rapid count as shown at right RUN 0 0 0 3 The RUN LED remains on e m 0 0 me0 4 The 1 2 4LEDs flash randomly e e e e If this sequence is observed go to Display Check If the RUN LEDdoes not remainon andtheA9CCjumper is inthe normal position replacethe A9 CPU assembly and repeat the three LED patternchecks If the RU...

Page 105: ...A9 assem bly is in the normal lowest slot Press PRESET again and watch LEDs 1 2 4 closely for a rapid binary count If the LEDs completea binary countto six but get stuck ON or OFF insteadof flashing go to A1 A2 Front Panel Troubleshooting If the LEDs do NOT complete a binary count to six but get stuck ON or OFF instead of flashing the A9 CPU assemblyhasfailed a self test The failedtest andfaulty c...

Page 106: ...ransfer switchor associated cables Press MENU POWER I 2 O xl and listen for the click of the attenuator Attenuator activity indicates that the W12 cable is good troubleshoot S4 and its associated cables Attenuator inactivity indicates a problem with W12 the lower box control and power cable DIAGNOSTICCHECKS The analyzer incorporates 20 internal diagnostic tests Most tests can be run as part of one...

Page 107: ... A9 A10 Most likely A9 assembly A10 A9 A12 Check analog bus node 17for 1 MHz If correct A12 is verified suspect A10 A10 A9 Most likely A10 A2 Al A9 Runtest 23 If fail replace A2 If pass problem is on bus betweenA9 and A2 or on A9 assembly A16 A9 Disconnect A16 and check A9J2 pin 48 for 4 MHz clock signal If OK replace A16 If not replace A9 A15 AB Destinatlon assembly See Power Supply sectlon A14 R...

Page 108: ...xists on that assembly DISPLAY TROUBLESHOOTING ALL MODELS Continue with HP8719A 20B Display Troubleshooting for color CRT instruments or HP8720A Display Troubleshootingfor monochromeinstruments HP8719Al20B DISPLAY TROUBLESHOOTING If the display is faulty in intensityor focus performthe Display Intensityand FocusAdjustments in the Adjustments section If this does not resolvethe problem continue Mea...

Page 109: ...pu com ND Press EXECWE 7 E W softkey1 As soon as you pressthe key allof the LEDsshouldflash and the display should blank Also note All LEDs except al remain OFF display blank go to Run Remaining Display Tests Some LEDs ON or display not blank continue Inspect RibbonCable and Repeat Display Test 52 Inspect the A9 A19 ribbon cable for a loose connection Repeat Run Display Test 52 and observe the dis...

Page 110: ... at A9 replace A9 assembly Signal at A9 replace cable Signal present at A19 end of cable continue PATTERN PATTERN Run Remaining DisplayTests Rundisplaytests 53 through 58 Ineachtestthefront panelLEDsshouldflash andthenturnOFF The display should blank except in test 58 where it dims Press PRESET SYSTEM SERVICE MENU softkey 8 TESTS softkey 1 53 xl EXECUTE E S T softkey 1 to observe the next test Rep...

Page 111: ...n paragraph below I If the intensity and focus are not reasonable or if the display is discontinuousor choppy see Check Display Intensity and Focus below If the display is blank continue Check Display Power Supplies Refer to Figure4 and measurethe power supply vottages on the A18 display If these voltages are incorrect refer to the paragraph titled Display Power Troubleshootingin the Power Supply ...

Page 112: ...ND must be connected 5 VDSP 4 9 to 5 3V 15 MSP 14 5 to 15 5V 15 VDSP 14 4 to 15 6V Figure 4 A18 Display Voltages 10 Digital Control HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 113: ...d replacethe display If the display is normal with A9 removed but blanks out or displays abnormal characters when A9 is reinserted continue Check Display Intensity and Focus Refer to theAdjustments andCorrection Constants sectionof this manualto performthe display intensity and focus correction constants routine If either correction constant cannot be set continue with this procedure HP 8719and HP...

Page 114: ...from the display X Y Z analog assembly see Figure 6 BOTTOM VIEW A15 Preregulator X Y z Analog Board Assembly Bla5k Ext nal Bdck gctor lntensitv Turn ON the instrument and press DISPLAY MORE INTENSTTY see Figure 7 as required 12 Digital Control HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 115: ...S and measure the yellow focus wire while turning the RPG CW and CCW as before Compare the results to Table 4 I blue Intensity I OV I 1V I ToMe4 Cable Voltages Win Color Function If the voltages are correct replace A18 Adjustment Range Nominal Minimum CCW or j Maximum CW or I yellow focus Ifthe voltages are incorrect identifythe faulty assembly intensity focuscable RPG or A2 as follows HP 8719and ...

Page 116: ...Tests earlier inthis section If tests 2 to 11have passed replace A16 Test 13passes the A9 CPU assembly can communicatewith A16 to a 5O0 0 confidence level If you are confident of the Troubleshooting HP IS Systems checks performed in the Troubleshooting section replace A16 Al A2 FRONT PANEL TROUBLESHOOTING Press PRESET and observe the six upper front panel LEDs No LEDs ON or all six LEDs remain ON ...

Page 117: ...nstrumentto enter the front panel error codes test and generate a unique pattern of front panel LEDs for each key pressed or stuck To determine which key is stuck match the pattern of LEDs ON to Table 5 Free the stuck key or replace the A1 front panel The exception is the case of a stuck PRESET key In this instance the A9 CPU H LED remains ON HP 8719 and HP 8720 Disital Control E Artisan Scientifi...

Page 118: ...nt State lnstrument State Stimulus Stimulus lnstrumentState lnstrumentState Softkey Response Entry Entry Response Response Entry Entry Softkey Stimulus Entry Entry Stimulus Softkey Entry lnstrument State Softkey Codes Key CAL 3 k m DISPLAY AVG 2 1 3 5 9 Gin CH 1 CH 2 8 7 1 STOP SAVE RECALL MENU START COPY SYSTEM 6 SCALE REF 6 M u MEAS FORMAT 5 4 2 SPAN w ENTRY OFF CENTER 8 4 LOCAL 7 BACK SP x l MK...

Page 119: ...formance test or adjustment failed continue NOTE Abus waveforms shown in this section apply to the HP 8720 the portion appropriate for the HP 8719A is indicated Phase Lock Error Message Displayed Press PRESET SYSTEM SERYICE MENU INPUTPORTS ANALOG BUS 9 xl to view the O SV GHz signal to the YIG oscillatordrives Note that for each band the waveform should start and stop exactly as shown in Figure1 w...

Page 120: ...Source Troubleshooting Flowchart A l l PIYP LW f cr I 2 Source HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 121: ...edProblems If power levels are incorrect in all three bands go to BroadbandPower Problems BROADBAND PHASE LOCK PROBLEMS Phase lock problems can be caused by incorrect pretune correction constants Perform the sourcepretunecorrectionconstantprocedure servicetest 43 seeAdjustments to fix this poten tial problem Then press PRESET to see if the phase lock problem persists If the phase lock problem pers...

Page 122: ...t the RF signal path Press SYSTEM SERVICE MENU SERVICE MODES SRC TUNE P A C NUMHMBAND I O 0 xl to enter the service mode The RFpowerlevel out of the power splitter toward the R sampler should be at least 13 dBm If the power level is correct check the 20 dB attenuator A68 and replace itor the Rsampler If the power level is not correct troubleshoot A67 insertion loss 7 5 dB Check Open Loop Power Ver...

Page 123: ...Press I 7 XI to check the 1 MHz signal the counter should read 1 000 MHz If either counter reading is incorrect replace A12 Check A14 Fractional N Fractional NChecks With ABUS Press 2 I XI and compare the fractional N tuning voltage to Figure3 HP 8719 and HP 8720 Source 5 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 124: ...ontinue with A14 VCO Exercise below If the instrument passes both checks the probability is greater than 90 that A13 and A14 are functional go to Check Pulse Generator or continue with A14 VCO Range Check with Oscilloscopeto confirm Counter Value A14 VCO Range Check with Oscilloscope I Connect an oscilloscope to A14TP1 labeled VC0 2 Press PRESET SYSTEM SERVICE MENU SERVICE MODES FRAC N N N E ON Va...

Page 125: ...RVICE MENU pNPVTPORTS ANALOG BUS COUNTER FRAC N to set the internalcounter to the frac N node Inturn jumper each of the three supply voltagesto A14TP14 and observethe frequency as shown in Table 2 If the frequency changes are not correct replace A14 TaMe 2 VCO Excerdse Mat HP 8719 and HP 8720 Source 7 Counter Frequency 240 MHz 1 5 5 MHz I05 MHz Supply Test Point 871 A1208 872QA A8TP7 A8TP8 A8TP8 A...

Page 126: ...the one to A141 is optional The A14 assembly generates a TTL cycle start CST signal every 10 microseconds whenthe VCO isoscillating Connectanoscilloscopeto A14TP3 CST Suggestedverticalscale 0 2Vldiv If there is no signal replaceA14 Use the CST signal as an externaltrigger for the oscilloscopeand observe the signals listed in Figure 5 Since these TTL signals are generated by A14 to control A13 chec...

Page 127: ...scope frequency counter frequency I80 MHz x harmonic 3 Repeat step 2 using the information in the second and third lines of Table 3 Table3 First IF Settings DAC Number Band If the IF signals are proper go to A l l Phase Lock Low Mid High High If the IF signals are improper check the pulse generator bias voltages see A51 Interface Power Supplies If the voltages are correct replace the A52 pulse gen...

Page 128: ...dicate a band related problem Therefore you should start by measuring power from S1 If the power here is good then all of the components in Figure 6 are verified Continue troubleshooting with Broadband PowerProblemsto check other RF components Also keep these points in mind See the Troubleshootingtab to removethe instrument covers and pivotopen the instrument Cables or improper connections can be ...

Page 129: ...aveforms Connect an oscilloscope to the points indicated in Table 5 and compare the wave forms to the figures noted A l l YIG FMCoil DriveCheck Press PRESETJ MENU SWEEP 7lMEMANUAL 2 1x11to observe the YIG FM coil drive waveforms Connect an oscilloscope to the points indicated in Table 5 and compare the waveforms to the figures noted The YIG2 FM coil drive signal is very small about one fifth the s...

Page 130: ...Slow sweep speed of oscilloscopeto about 0 2 seconds dlvision YlGl main coil YIG2 main coil If the YIG coil drive signals are incorrect replaceAll a YIG 1MainCoil b YIG 2 MainCoil c YIG 1FM Coil 0 04V I b about 2 seconds 4 Figwe 7 YIG Coil Drfue Wouefonns 12 Source HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 131: ...11 and measure power at the second port Less than 0 dBm at the second port continue with A69 Step Attenuator Check and A67 Power Splitter Check next At least 0dBm at the second port option 003 instruments at least 20 dBm at port 2 either the directional coupler or the bias tee or the transfer switch S4 is faultyf he power loss through each of these components should be negligible A69 Step Attenuat...

Page 132: ...e location diagram on the instrument cover Table 6 lists the supply voltages at A51Jl the assembliesthat usethese supplies andthe sourceof each supplyfor each assembly Notethat address and control lines are not shown MeasuringLower Box Bias Voltages To check bias voltages locatethe suspectedassembly and measurethe voltages at the jack J and pin p noted If the voltagesare correct returnto the sourc...

Page 133: ...57 LO A64 R sampler A65 A sampler A66 B sampler A69 step attenuator IS1J l Voltager 1SV Supply passes throughother components and voltage may be lower Note Key 15V 15V Key 5 2V 5V f22V Rgwv 8 Voltagesa t Pins ofW12H HP 8719 and HP 8720 Source 15 16 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 134: ...es orad Associated Poths START HERE Signal Path R A B If all three signal paths showed unexpected results in the IsolateFaulty Group section probably A12 or A10 is faulty continue with All Signal Peths Look Bad next If at leastonesignalpathlookedgood butthe othersdid not gotoAt LeastOne SignalPathLooks Good Port internal 1 2 HP 8719 and HP 8720 Receiver 1 Directional Coupler A68 20 dB am A62 A63 S...

Page 135: ... signal not at A10P2 pin 6 check signal at A12P2 pin 36 4 MHz signal not at A12P2 pin 36 replace A12 4 MHz signal at A12 but not A10 check the motherboardtrace AT LEAST ONE SIGNAL PATH LOOKS GOOD One good signal path indicates that at least one sampler one 2nd converter A12 and much of A10 are functional Thus substitution is a convenient troubleshooting approach If two signal paths are bad repeat ...

Page 136: ...igun 1 Nonnal d Abnormal SignalPath R A and B Tmces Note scale and referenceposiffm DirectionalCoupler Check To quickly check the directional coupler by elimination connect the RF flexible cable from the output of A68 thestep attenuator directlyto the J2 RF INPUTof the suspect signalpathsampler Press SYSTEM SERVICE MENU NPUTPORTS A or B and compare the trace to Figure2 HP 8719 and HP 8720 Figure 2...

Page 137: ...aulty Continue with Sampler Voltage Check Sampler Voltage Check NOTE The BIAS CONTROL line is not used Check the SAMPLER CONTROLvoltage greenwire at the suspectsampler The voltageshould beabout 0 22V whenthe sampler ison Ifthe samplercontrolvoltage iswrong replaceASl the interface assembly Do NOT replace the sampler the problem is in the control signals Check the f15V and 15V supply voltages If th...

Page 138: ...ath substituteA6 with A5 Press SYSTEM SERVICE MENU INPVTPORTS R and compare the CRT trace to the signal path R trace of Figure 1 Normaltrace means the substitute 2nd converter functions replace A10 Abnormal trace means the substitute is faulty replaceA4 or A5 HP 8719 and HP 8720 Receiver 5 6 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 139: ... analyzer is assumed to be free of hard failures it the previous checks provided inIsolateFaultyGroup Any remaining anomaly must be a soft failure Usethe following procedures to isolate the fault START HERE Accessories troubleshooting is organized in three major sections It is suggested that the pro cedures be performed in the order given 1 Inspect and Gage Connectors Check the physical condition ...

Page 140: ...TCH REPEATABILITY Calibration does not compensate for the repeatability of the mechanicaltransfer switch so the switch can be a source of error To check the switch use the following procedure 1 Press PRESET AVG IF BW I O 0 1x11to set the bandwidthto 100 Hz 2 Press CALI CAUBRATE MENU RESPONSE to access the response calibrationmenu Connect a short to test port 1and press SHOW DONE RESPONSE 3 Press D...

Page 141: ...nceerror term data to system faults Table 1 CMponartsReiated to Specijic Envr Terns Component cal kit load cal kit open short test port conn coupler bias tee transfer switch step attenuator power splitter sampler A10 digital IF external cables Directivity Source Match X X X X X X X Refl t n Tracking X X X X X X X X Isolation Load Match X X X X X X X Frequency in GHz at which the component is more ...

Page 142: ...ows which assembliesaffect each error term If more than one error term is bad note which assemblies are common to each of the bad terms These are the suspects There are two methodsof fault isolation The simpler of the two methods can be used only with option010 timedomain instruments Tocheck press SYSTEM Ifthe middlesoftkey islabeled TRANSFORMMENU the instrument has option 010 Continue with Time D...

Page 143: ...nd you should havea list of suspected assemblies Sincethe analyzer has two identicalports you can swap identicalassemblies between the port 1and port 2 signal paths and then regenerate the error terms When the problem moves from one port to another you have found the offending assembly Before trying this be sure to inspect the front panel test port connector for obvious damage Tighten all semi rig...

Page 144: ...ough electrical delay so that the trace appears as a dot at the left side of the circle Replacethe good short with the questionableshort at port 1 If the trace of the questionable short does not appear very similar to the known good short the questionable short is not suitable for use with the analyzer 3 Connectthe good opento port 1 Press SCALEREF ELECTRICAL DELAY andturn the RPG to enterenoughel...

Page 145: ...t Tmces of Good Short left and Open Figure 5 Typical T h e Domain Rot o f Option 003 InternalRF Path HP 8719 and HP 8720 Accessories 718 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 146: ...applicable the HP IB mnemonic is written in parentheses followingthe key See HP IS Mnemonic Definitions at the end of this section INTERNAL DIAGNOSTICSSUMMARY The internaldiagnosticsmenus are shown in Figure1anddescribedinthe following paragraphs The internaldiagnostics keys are l7ESTS TEST OPnONS and SELF DIAGNOSE HP 8719and HP 8720 Service Key Menus 1 Artisan Scientific Quality Instrumentation G...

Page 147: ...sts Remember HP IB commands appear in parentheses following the keystroke KEYSTROKE A COMMAND A The tests are divided by function into the categories described below To accessthe first test in each category press the category softkey To access the other tests use the number pad step keysor knob The test number name and statusabbreviationwill bedisplayedinthe activeentry area of the CRT Table 1show...

Page 148: ...TS Theseare additional self evaluating self tests However these require some user interaction such as keystrokes HP I8 Code 0 1 2 3 4 5 SYS VERTESTS These tests are part of the systemverificationprocedure and are also usedto examinethe contentsof the measurementcalibrationarrays The procedureis inthe Verification section Informationabout the calibration arrays is provided in the Error Terms sectio...

Page 149: ... Usethe RPG knobto scroll through the tests and see which failed If allpass the test displays a PASS status Eachtest in the subset retains its own test status 1 PRESET This runs the following subset of internal tests first the ROM RAM tests 2 3 and 4 then tests 5 6 7 8 9 10 11 14 15 and 16 If any of these tests fail this test returnsa FAlLstatus Usethe RPGknobto scrollthroughthe tests and see whic...

Page 150: ...ffering and address decoding See also tests 23 and 24 below Rear Panel This runs only when selected or with ALL INTERNAL Ittests the ability of the A9 CPU main processor to writelread to the rear panel control elements It mostly tests the A16 rear panel but also requiresA9 CPU data bufferingand address decoding It does not test the HP 16 interface for that see the IntroductoryOperating Guide Post ...

Page 151: ...he keysin any order and this test displays the commandthe instrument received 25 ADC Hist Factory use only Sys Ver Tests Thesetests apply mainly to system level errorcorrected verificationand troubleshooting Tests 26 to 30 are associated with the system verification procedure documented in the Verification section Tests 31to 42 facilitate examining the calibrationcoefficientarrays errorterms resul...

Page 152: ...bsoluteamplitude accuracy inthe 30 dBm input power region ADC Ofs COT This measures the A9 CPU ADC linearity characteristics using an internal ramp generator and stores values for the optimal operating region During measurement the receiveradds an offset biasto the IFsignals so they are centeredin the optimal region This improves low level dynamic accuracy Serial COT This stores the serial number ...

Page 153: ...n case of problems refer to the HP8719A 20B Display Degaussing Demagnetizing procedure in the Adjustments section 63 Test Pat 5 This is a 16 stepgray scale pattern 64 Test Pat6 This stepgray scale patternis usedinthe Background Adjustment of the display 65 Test Pat 7 This convergence pattern is for factory use only 66 67 Test Pat 8 9 These crosshatch and inverse crosshatch patterns are for factory...

Page 154: ...NU SRC TUNE Y E W SRC TUNE SOURCE P U ON off P U WTO ON Off P U DlAG on OFF PLL PAUSE CCONTI MORE RETURN PEEGPOKE ADDRESS I PEW I POKE 1 R M R N 1 l W T P O R T S YENU A I I ANALOG BUS I TEST SET FWD1 CREW Figure 2 Service Modes Menus SOURCE FREO TUNE DAC NUM I LOW B4ND I OAC NUM MID B4ND M C NUM I HIGH W D I SOURCE TUNE OFF R M R N S W C E MDES YENL IF W N AUTO IF W N I ON IF W N I OFF STORE EEPR...

Page 155: ...unters phase lock problems e g harmonic skip it will automatically attempt to determine new pretune values It will continueto do this until phase lock is achieved This mode allows you to disable that function so that the phase locked loop is not continuously trying to recalibrateitself With PLLAUTO OFFthe frequencies and voltages are not changingas they are when they are attempting to phase lock s...

Page 156: ...he correctionconstantsthat residein non volatile memory EEPROM onto a disc Correctionconstants improve instrument performance by compensating for specific operating variations due to hardware limitations refer to the Adjustmentssection Havingthis informationon disc is usefulas a backup incase the constants are lost perhapsdue to a CPU board failure Without adisc backupthe correctionconstantscan be...

Page 157: ...ss the menu by pressing SYSTEM SERVICE MENU PEEK POKE as shown in Figure2 The keys are described below CAUTION PEEKIPOKEcapability is intended for service use only PEEKIPOKE ADDRESS PEEUD This softkey accessesany memoryaddress anddisplays it in the active entry area of the CRT Use the RPG entry keys or step keys to enter the memory address of interest PEEK PEEK This softkey displays the data at th...

Page 158: ...rence useful for troubleshooting components in the A input path Bl Same as A above but for B Rl Displaysthe Rinputsignal alone usefulfor troubleshootingcomponents inthe Rinputpath ANALOG BUS ANABtONDFF This keydisplaysthe currentanalog businput whichcan be one of 23 nodes throughout the instrument It also accesses the analog bus menu described below For adescriptionof the capabilitiesof the analog...

Page 159: ...s switches the counter to count the A14 fractional N VCO frequency at the node shown on the OverallBlock Diagram DIV FRAC N This switchesthe counter to count the A14 fractional NVCO frequency after it has been divided downto 100 kHz for phase locking the VCO DESCRIPTIONOF THE ANALOG BUS The analog bus isa single multiplexedlinethat networks 23nodeswithin the instrument Itcan be controlled from the...

Page 160: ...and source problems To read the counter over HP IB use the command OUTPCNTR Notes Fast movingwaveforms may be sensitive to sweep time Anything occurring during bandswitches is not visible The analog bus input impedance is about 50K ohms Waveforms up to approximately 200 Hz can be reproduced About 0 750 MHz is a typical counter readingwith no AC signal present The display and marker units U corresp...

Page 161: ...he test point of interest to the AUX INPUT BNC connector on the rear panel This feature can be useful if an oscilloscope is not available Also itcan be usedfor testingvoltagecontrolleddevices by connectingthe driving voltage of the DUTto the AUX INconnector You can look at the driving voltage on one display channel while displaying the DUT S parameter response on the other display channel With AUX...

Page 162: ...oltage ramp used to tune the source oscillators You should see a voltage ramp like the one shown in Figure 5 If this waveform is correct you can be confident that the A11 phase lock assembly the source assemblies the A13 A14 fractional Nassemblies and the A52 pulse generator are working properly and the instrument is phase locked If you see anything else refer to the Source troubleshooting section...

Page 163: ...hase lock the source Figure 6 Location ofIntemal CounterReading on CRT 12 IF Det IF on A11 phase lock after 40 MHz filter This node detects the IF as a voltage at the output of the 40 MHz filter on the A11 phaselockassembly Thetrace shouldbeaflat lineat about 1 N as shown in Figure 7 Figure 7 Nude 12 Typical IF Detector Voltage Trace 18 Service Key Menus HP 8719 and HP 8720 Artisan Scientific Qual...

Page 164: ...ce Counter ON analog bus Reading 9 996 MHz Thisnodecounts the 2nd LOused bythe 2ndconverterassembliesto producethe2nd IF of 4 kHz PL Ref Phase lock reference Counter ON analog bus Reading 1 MHz This nodecountsthe referencesignal usedbythe phasecomparatorcircuit ontheA11 phase lock assembly VCXO Tune 40 MHz VCXO tuning voltage This node displays the voltage used to fine tune the A12 referenceVCXO t...

Page 165: ...icate the band crossings The counter can also be enabled to count the VCO frequency Use CW mode Figure 8 Node 21 FN VCO Tun FN VCO Tuning Voltage 22 A14 Gnd Ground reference 23 Count Gate Analog bus counter gate This node checks the analog bus counter gate signal You should see a flat line at 5V The counter gate activityoccurs during bandswitches and therefore is not visi ble on the analog bus To ...

Page 166: ...s can be anticipated and the appropriate response sent remotely over the bus to the network analzyer Any time a service routine prompts the user and waits for a response or when the test finishes bit1of the EventStatus Register B isset bit1 service routinewaiting Readingthis register resets the bit Initiatethe test and eitherwait ina loopfor the service routinewaiting bitto be set or enable the bi...

Page 167: ...prompt messagesent to the error queue by a service routine OUTPTESS Outputs the integer status of the test most recently executed Status codes are those listed under TST TST Executes the power onself test and outputs an integer test status Status codes are as follows 0 pass 1 fail 2 in progress 3 not available 4 not done 5 done 22 Service Key Menus HP 8719 and HP 8720 Artisan Scientific Quality In...

Page 168: ...orrection constant adjustments Internaltests 2 through 4 are not performed This destructiveversion of the CMOS RAM test internaltest 3 continuously writes over information stored there This destructiveversion of the main DRAM test internaltest 4 continuously writes over information stored there This position skips ROM and RAM testing The far left or bottom position is the normal position In this p...

Page 169: ...iveMaintenance A stable repeatablesystemshouldgenerate repeatableerror terms over longtime intervals for example six months Makea hardcopyrecord printor plot of the error terms then periodically compare current error terms with the record A sudden shift in error terms reflects a sudden shift in systematic errors and may indicatethe need for further troubleshooting A long term trend often reflects ...

Page 170: ...uretwice usingtwo distinct measurementcalibra tions to establishthe degree of repeatability If the resultsdo not seem repeatable check all connectors and cables MEASUREMENT CALlBRdTlON PROCEDURE 1 Press PRESET CALI CAUBRATE MENU FULL 2PORT to performa full 2 port calibration with slight modifications This calibration sequence is comprised of three parts REFLECTION For these measurements short open...

Page 171: ...e for the selected error term into display memory and displays it Use the scale reference and marker functions to study the error term trace and determine its magnitude Compareit to the Error Term Descriptions below and to earlier data measured on the system If system specific data is not available refer to the typical uncorrected performance specifications listed in Table 2 To make a hardcopyof a...

Page 172: ...idelines to interpretation The same description applies to both the forward F and reverse R terms The plots shown with each are typical of a working system following a full 2 port calibration as performed in Measurement Calibration Procedure above It may be helpfulto define some of the terms used in the descriptions below 0 5 to 2 32 dB 18 dB 28 dB k 2 dB k l dB 75 dB R signal path refers to the r...

Page 173: ...nt is assumed to be due to directivity error Signiffcant System Components The load used in the calibration is the most important component The test port connector and the coupler also greatly affect the measureddirectivity error Aftcbcted Measurements The measurements most affected by directivity errors are meas urements of low reffection devices highly reflective device measurements will appear ...

Page 174: ... to the output port Significant SystemComponents The open and short calibration devices are important as are the coupler and test port connectors The power splitter bias tees step attenuator and transfer switch may also contributeto source match errors Affected Measurements The measurements most affected by source match errors are reflectionand transmissionmeasurements of highly reflective DUTs FI...

Page 175: ... 1GHz 9 dB at 500 MHz and 20 dB at 130 MHz SlgnMcantSystemComponents The open and short calibrationdevices havean effecton reflectiontracking But large variations in this error term may indicate a problem in one of the signal paths Suspect the R signal path if the problem appears in both ERF and ERR Trou bleshootthe A or B input paths first if only one reflectiontrackingterm is affected A w e d Me...

Page 176: ...aging will also reduce the peak to peaknoise in this error term Significant System Components Loose cable connections or leakage between compo nents in the lower box are the most likely cause of isolation problems The transfer switch bias tees couplers and samplers are the most susceptiblecomponents Afkctad Measurements Isolationerrors affect both reflection and transmission measure ments primaril...

Page 177: ...nprocedure Signilkant System Components Large variations in the forward or reverse load match error terms may indicate a bad thru cable or a poor connection of the cable to the test port Measuremamts The measurements most affected by load match errors are all transmission measurements and reflection measurements of a low insertion loss t o p r t device such as an airline HP 8719 and HP 8720 Error ...

Page 178: ...ng appears as a slope of 1 to 3 dB in magnitude responsefrom 2to 20GHzanda rolloffbelow2GHz with approximatevalues of 4 dB at 1GHz 9 dB at 500 MHz and 20 dB at 130 MHz Signiticant System Components Large variations in this error term probably indicate a probleminthe referencesignalpath if both ETFand ETR are bad or inthe Aor Binputpath The thru cable also has an effect on transmission tracking Aff...

Page 179: ... of the section SYSTEM OPERATION The HP 8720 and HP 8719 microwavenetwork analyzers integrate a synthesized source signal separationdevices athree channel receiverfor measurement of test devicecharacteristics and a large screen display Figure 1is a simplified block diagram of the network analyzer system PHASE LOCK Figure 1 Simplified System B i d Diagrum HP 8719 and HP 8720 Theory of Operation 1 I...

Page 180: ...nections and calibrationstan dards for accuracy enhanced measurements FUNCTIONALGROUPS OF THE ANALYZER The operation of the analyzer is most logically described in five functional groups Each group consists of several major assemblies and performs a distinct function in the instrument Some assemblies are related to more than one group and in fact all the groups are to some extent interrelatedand a...

Page 181: ...includes the line power module a 60 kHz switching preregulator and overvoltageprotection for the 5V digital supply It provides LEDs visible from the rear of the instrument to indicatecircuit status HP 87208 ONLY A8 POST REGULATOR LinePower Module The line power module includes the line power switch voltage selector switch and main fuse The line power switch is activated from the front panel The vo...

Page 182: ...b in the troubleshooting section for more infor mation A8 Post Regulator The A8 post regulatorfilters and regulatesthe DCvoltages receivedfrom the A15 preregulator It provides fusing and shutdown circuitry for individual voltage supplies It distributes regulated constant voltages to individual assemblies throughout the instrument It includes an overtem perature shutdown circuit the variable fan sp...

Page 183: ...he 5VCPU isused bythe A19 GSP butnotthe A18 display The 65V is used by the A18 display but not the A19 65V is only routed through it to the display Both supply voltages can function to operate the display even when other power supplies are shut down They are individually regulated not connected to the regular shutdown circuitry HP8720A Display Power The A8 assembly supplies three voltages to the d...

Page 184: ...lor peripherals The HP 8719A120B have one additional assembly the A19 GSP FRONT I I HP 87208 ONLY HP 87208 ONLY OUTPUTS DIGITAL P r n MEMORY 65V FROM Aa I 0 L I A18 DISPLAY HP 8720A ONLY I PROCESSOR J3gure3 Digftal Contrd Group Shplifed Block Diagram r A16 REAR PANEL 1 r HP 18 HP I8 L l INTERFACE 6 Theory of Operation HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88...

Page 185: ...hics signal processor the logic circuit in the A51 interface assembly and the HP I8 interface In addition when the analyzer is the system controller the main CPU controls peripheral devices through HP 18 ROM The main CPU has a dedicated ROM read only memory that contains the operating system for instrumentcontrol CMOSRAM Frontpanelsettings instrumentstates canbestoredinthe CMOS RAM random access m...

Page 186: ...r display with a dedicated microprocessor controlled digital interface It readsthe formatted data from the main RAM on the A9 assembly and displays it on the CRT The A18 display receivesthree powersupplyvoltages 5VCPU 15VDSP and 15VDSP The 15VDSP and 15VDSP supplies are unique to the display and are not used by any other assemblies they are individually fused and regulatedin the post regulator ass...

Page 187: ... process and provide additionalinformation on the assemblies inthe sourcegroup 1 The source is pretuned high The source signal SOURCE OUT is fed to the R sampler SOURCE OUT TO R SECOND CONVERTER A12 REFERENCE la IF A l l PHASE 10 UHZ LOCK YO O R M 2 A signal VCO OUT is generated by the VCO in the fractional N synthesizer VCXO SOURCE nG OSCILLATOR 3 A comb of harmonics 1st LO is produced in the pul...

Page 188: ...or 3 A52 Pulse Generator the Harmonic Comb The signal from the synthesizer drives a step recovery diode SRD in the A52 pulse generator assembly The SRD generates a comb of harmonic multiples 1st LO of the VCO frequency which goes to the samplers One of the harmonics is 10 MHz below the desired start frequency 4 A64 R Sampler Down Convertingthe Signals The A64 assemblyis partof the receiverfunction...

Page 189: ...eated Table 1lists the subsweep frequencies from the synthesizer and the source Band Low Mid High Synthesizer MHz 120to 240 120to 180 120to 240 144to 237 6 132to 234 2 124to 235 148to 224 7 164to 223 4 156to 236 4 144to 239 9 HP 8720 Harmonic Number N HP 8720 Source GHz 0 130to 0 250 0 250to 0 370 0 370to 0 730 0 730to 1 I98 1 198to 2 118 HP 8719 Harmonic Number N HP 8719 Source G W 0 130to 0 250 ...

Page 190: ...peaker the woofer reproduceslow frequenciesandthe tweeter reproduces high frequencies Similarly in the YIG oscillators the main coils allow large slow changes in frequency but cannot respond to high frequency deviations which are sent to the faster acting FM coils The tune current from the All phase lock assembly splits into two paths One path is lowpass filtered removinghigh frequency components ...

Page 191: ...n the A70 assembly to improve the match between the modulator and the signal separation devices A7 ALC Automatic LevelingControl Part of the 10 MHz 1st IF signal from the A64 sampler goes to the A7 ALC automatic leveling control assembly This assembly is part of a leveling loopthat maintains constant power across the sweep The ALC loop illustrated in figure 6 detects the power level compares it to...

Page 192: ... AM input is provided to allow a DC signal of 0 to 10V approximately 1V dB to be applied at the rear panel This signal can be used for continuous controlof the output power in addition to the standard stepped power control usingthe internal attenuator 14 Theory of Operation HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 193: ... A67 Power Splitter A68 Attenuator The power splitter dividesthe source signal intotwo parts One part of the signalis routedto the Rsampler A64 for referenceand phase lock The 10dB attenuatorA68 isolatesthe Rsignal path from the restof the system and helpsensurethat the R signalis not subjectto gaincompression The remainder of the source signal is routed through the step attenuator transfer switch...

Page 194: ...th prevents RF from being imposed on the external DC supply A62 and A63 DirectionalCouplers The test signal goes into the through line arm of the couplers and from there to the test ports 10 dBm to 65 dBm and the device under test The coupled arm of the couplers carries the signal reflectedfrom or transmittedthrough the device under test to the receiver for measure ment The coupling coefficient of...

Page 195: ...9 998 MHz Figure 8 R d v s Fundfond Groyp SimplifiedBlock Diagram Samplers and Second Converters Each input signal goes to one of three identicalpairs of sampler and second converter assem blies R A and 6 that down convertthe signalsto afixed 4 kHz2nd IFwith magnitudeand phase corresponding to the input The 1stLO Signal is a comb of harmonicsof the synthesizersignal produced by a step recov ery di...

Page 196: ...re amplified by 24 dB to ensurethat they can be detected by the ADC analog to digitalconverter Fortroubleshootingpurposes the gain can be forcedon or off usingthe service menus referto the Receiver tab in the troubleshooting section The R path signal is fixed at a level high enough to maintain phase lock and therefore requires no amplification All three signals are sampledat a 16kHz rate set by a ...

Page 197: ...872OA only Significantdifferences are noted ADJUSTMENTS AND VERIFICATION Adjustmentsor verificationproceduresor bothmay be requiredto assurethat the analyzer meets its published specifications following replacement of an assembly Post Repair Procedures lists such requirements R E REBUILT EXCHANGE ASSEMBLIES COST LESS Lower cost assembliesare availablethroughthe rebuilt exchangeprogram These factor...

Page 198: ... will ensure accurate and timely processing of your order To order a part that is not listed in the replaceable parts lists include the instrument model number complete instrument serial number the description and function of the part and the number of parts required Address the order to the nearest Hewlett Packard office How to Order Parts Fast When you know which parts you needto repairthe instr...

Page 199: ...B Knob L LED Light EmittingDiode LG Length Long LKWR Lockwasher MACH Machine MM Millimeter MTLC Metallic N NEG Negative 0 OD Olive Drab Outside Diameter P PAN HD Pan Head PC Picocoulomb Piece Printed Circuit PNL Panel P O Part of Q silicon Controlled Rectifier SCR Transistor Triode Thyristor R Resistor S Switch TP Test Point u IntegratedCircuit W Cable TransmISSh Path Wire PN Part Number R Rear RF...

Page 200: ...lack Black Jade Gray Jade Gray Jade Gray UnitedStates Canada Japan 100V or 200V Mexico Philippines Taiwan Gray Switzerland Straight NEMA6 15P UnitedStates Canada Straight DHCK 107 90 Gray Gray Denmark Straight CEE22 VI System Cabinet Use 1 E EarthQrwnd L Une N Nmtrd 2 Pan numbershown for plugis irduaby i d e n t i wierplugonly Number shornf a cable is HP Pan NumberforcomplstecaWt n d u d i phg 3 T...

Page 201: ...onfor part numbers assembly in spares stock Return defective assem J Rebuilt exchange assemblies are shipped individually in boxes like this Inaddition tothe circuit assem bly the box contains Exchange assembly failure report Return address label Openboxcarefully itwill beusedto return defective assembly to HP Completefailure report Place it and defective assembly in box Be sure to remove enclosed...

Page 202: ...BDASSY REFERENCEBD ASSY R E FRACTIONAL N ANALOG BD ASSY FRACTIONAL N ANALOG ED ASSY R E FRACTIONAL N DIGITAL ED ASSY FRACTIONAL N DIGITAL BD ASSY R E 120A PREREGULATORASSY i z o j PREREGULATOR R E 19A 208 PREREGULATORASSY 19A 208 PREREGULATORASSY R E FUSE3 15A 250V REAR PANEL ED ASSY 19A 208 REAR PANEL ED ASSY 19A 208 REAR PANEL ED ASSY R E 20A MOTHERED ASSY INCLUDES MOTHERED RIVETED TO CAGE ASSY ...

Page 203: ... 7 visible A18 A1 A2 not visible not visible Figure 2 Major Assemblies 2 of 4 HP 8719 and HP 8720 Replaceable Parts 7 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 204: ... YIG 2 E20 GHZ 19A YIG 2 8 13 5 GHZ YIG 1 2 8 GHZ YIG 1 2 8 GHZ R E LOWER FRONT PANEL BD ASSEMBLY FIXED OSCILLATOR 3 8 GHZ MODULATOR 20A 208 ISOLATOR BlAS TEE BlAS TEE R E DIRECTIONAL COUPLER SAMPLER SAMPLER R E POWER SPUlTER MICROWAVE AlTENUATOR 8 GHZ MAX STEP ATTENUATOR ATTENUATOR FIXED3DB ATTENUATOR 6 0 8 FlXED OPT 003 ONLY SHIELD AlTN CABLE OPT 003 ONLY MICROWAVE SWITCH TRANSFER SWITCH Figure ...

Page 205: ...2 A52 S4 A56 A63 A60 A61 not visible Figure 2 Major Assemblies 4 of4 HP 8719 and HP 8720 Replaceable Parts 9 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 206: ...LEXIBLE RF CABLE ASSY A51J19ALCOUT A17J9 FLEXIBLE RF CABLE ASSY A51J18 IF IN A64J3 IF OUT F L M l B l E RF CABLE ASSY A17J10 IF INIA51J2O IFOUT CABLE ASSY A5U2 A51J4 FLEXIBLE RF CABLE ASSY A17J12 B IF IN A66 SAMP B 53 FLEXIBLERF CABLE ASSY Al4Jl A52J1 SEMI RIGID RFCABLE A66 A63 OPT 003 NOT USED SEMI RIGID RFCABLE A M 2 RF INlA68 CABLE ASSY A51J3 A58J1 SEMI RIGID RF CABLE A61 A62 SEMI RIGID RF CABL...

Page 207: ...21 W26 S4W1 W25 2 2W24 Option 003 See Figure 3 3 of 4 insert Figure 3 W e s 2 of 4 HP 8719 and HP 8720 Replaceable Parts ll Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 208: ...CABLE ASSY A13J2 Al212 F W I B L E RF CABLE ASSY AlUlI R PANEL EXT REF FLEXIBLE RF CABLE ASSY A7 Al1J1 20A CABLE ASSY AWl A18Jl 19A 20B CABLE ASSY ALUl A19 RIBBON CABLE ASSY A17J1 A2 20A RIBBON CABLE A S S Y A E A J DLWAY 19 RIBBONCABLEASSY A9IA19 CABLE ASSY FAN AI PI0 FAN ASSY SEMI RIGID RF CABLE S4A8 3 OPT 003 ONLY SEMI RIGID RF CABLE A601A71 OPT 003 ONLY Figure 3 Cables 3of 4 Mfr Code Mfr Part ...

Page 209: ...6W1 W42 A15Wl not visible W13 W43 not visble Figure 3 Cables 4 o f 4 HP 8719 and HP 8720 Replaceable Parts 13 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 210: ...INE SEEFIGURES 6 AND 7 SCREW MACHINE SEEFIGURES 6 AND 7 SCREW MACH M3 5 X 0 6 8MM LG PAN HD WASHER FL MTLC 3 5 MM 3 BMM ID 2OA SO 7KEYS COVER 19A 20B SOFTKEYSCOVER 20A DISPLAY BEZEL ASSEMBLY SCREW MACHINE SEE FIGURES8 AND 9 19A DISPLAY BEZEL ASSEMBLY 208 DISPLAY BEZEL ASSEMBLY DISPLAY GASKET NOT SHOWN sr thread lypes is likely to damage threaded holes Figure 4 Front Pone1 1 of 4 Code Number 14 Rep...

Page 211: ...HP 8719 and HP 8720 Figure 4 Front Panel 2 of 4 Replaceable Parts 15 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 212: ...MACH M3 X 0 5 2 0 L G PAN HD FRONT SUSPANEL UPPER SOFTKEYS COVER SCREW MACHINE SEEFIGURES 8 AND 9 FRONT DRESS PANEL LOWER FRONT SUB PANEL LOWER RETAINER PUSHON KETO SHFT EXT SCREW MACH M3 X 0 5 8MM LG PAN HD A GASKET DISPLAY 19A 20B GASKET DISPLAY SUPWRT BEZEL SCREW MACHINE SEEFIGURE 10 PUSHBUTTON SWITCH P C MOUNT ar thread types I s likely to damage threaded holes Figure 4 Front Panel 3of 4 16 Re...

Page 213: ... not shown 4 places Rgm 4 Front Panel 4 oj 4 Replaceable Parts 1 7 HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 214: ...SSEMBLY EXT REF STANWFF HEX 255 IN LG 6 32 THO SCREW MACHINE SEE FIGURES6 AND 7 SCREW MACH M3 X 0 5 6MM LG PAN HD SCREW MACHINE SEE FIGURES 6 AND 7 AIR FILTER GUARD 8 RETAINER 4 65 X 4 65 SCREW MACHM3 5 X 0 6 20MM LG 20A REAR PANEL 19A 20B REAR PANEL FAN TUBEAXIAL INCLUDES W45 CABLE ASSY 3r threaa types is likely to damage Utreadedholes Figure 5 Rear Pond 1 of 2 Mfr Code 28480 28480 28480 28480 28...

Page 215: ...Figure 5 Rear Panel 2 of 2 HP 8719 and HP 8720 Replaceable Parts 19 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 216: ...H M3 X 0 5 14MM LQ STABILIZERCAP PC BD STABILIZER SCREW MACH M3 X 0 5 10MM LGPAN HD WASHER FLMTLC3 0 MM 3 3 MM ID CAN HOLDDDWN LOCATOR HOLDDOWN PI0 CAN HOLDDOWN CAN GUIDE PLASTIC SCREW MACH M3 5 X 0 6 8MM LG PAN HD SCREW MACH M3 5 X 0 6 8MM LG SCREW METRIC SPECIALTY M4 X 0 7 THD 6 SPRING CLIP 41 X 30 MM I I Iof omer thread types is likely to damage threaded hdes Figure 6 Top View of instrument Top...

Page 217: ...Figure 6 Top Mew of Instrument Top Half 2of 2 HP 8719 and H P 8720 Replaceable Parts 21 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 218: ...ER SNAP INB A U STUD 10 MM B A U WASHER LK HLCL8 0 MM 8 1 MM ID SCREW MACHM4 X 0 7 IOMM CG PAN HD WASHER FL MTLC 4 0 MM 4 4 MM ID INSULATIONCABLE SCREW METRIC SPECIALTY M4 X 0 7 MD 8 HINGEHALF SEE flGURE 8 3r thread typesis likelyto damage threaded holes Mfr Code 28480 28480 ow00 55787 28480 28480 28480 28480 28480 Figure 7 Bottom V i m of Instrument Top Hag 1of 2 Mfr Part Number 0515 1234 5041 72...

Page 219: ...ces W44 A17 d 3 places Figure 7 Bottom V f aof Instrument Top Hdf 2of2 HP 8719 and HP 8720 Replaceable Parts 23 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 220: ...0 MM 4 1 MM ID SCREW MACH 8 32 312 IN LQ PAN HDPOZI SCREW MACHM3 X 0 5 MMM LG PAN HD SCREW MACHM3 X 0 5 12MM LGPAN HD SCREW MACHM4 X 0 7 8MM LG PAN HD SCREW MACHINE SEE FIGURE8 PC BD GUIDE BRACKETGASSPRINQ BALL GAS SPRING WASHER LK HLCL8 0 MM 8 1 MMID SCREW MACHM3 5 X 0 8 8MM LG SCREW MACHINE ASSY M3 5 X 0 6 ALIGNMENT ARM SCREW MACHM4 X 0 7 IOMM LG PAN HD Mfr Part Number Figure 8 Top Vieto ofInstr...

Page 221: ... 27 4 4 not places places shown places places places shown Figure 8 Top Viewo f lnstnrment Bottom HaIf 2 o f 2 HP 8719 and HP 8720 Replaceable Parts 25 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 222: ...R BY DESC SCREW MACH M3 5 X 0 6 8MM LG 28480 05151234 DECK FRONT 28480 0841500054 KINTERFACE SEE FIGURE 2 SCREW MACH 4 40 312 IN LG PAN HD POZI SCREW MACH 8 32 312 IN LG PAN HD POZI ORDER BY DESC I I 0r mread types is Ilkelyto damage threaded holes Figure 9 Bottom Viaa of Instrument Bottom Hav 26 Replaceable Parts HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOU...

Page 223: ...0 6 8MM LG PAN HD 4 SUPPORT PC BOARD 2 WASHER LK HLCL 8 0 MM 8 1 MM ID 2 BRACKETGAS SPRING BALL 2 FASTENER SNAP INBALL STUD 10 MM BALL SPRING 138 OD SEE FIGURE4 HlNOE PIN SEE FIGURE 8 4 SCRNV MACH M3 5 X 0 6 4MM LG PAN HD e of other thread types is llkely to damage threaded holes Figure 10 Side View 1 of3 Mfr Part Number Replaceable Parts 27 Artisan Scientific Quality Instrumentation Guaranteed 88...

Page 224: ...H M3 5 X 0 6 8MM LG PAN HD SCR MACH M3 5 X 0 6 8MM LG PAN HD SUPPORT PCBOARD WASHER LK HLCL 8 0 MM 8 1 MMlD BRACKETQAS SPRING BALL FASTENER SNAP IN B A U STUD 10 MM BALL sr mread types is likely to damage mreaded holes Figure 10 Side View 2 of 3 Mfr Code Mfr Part Number 28 Replaceable Parts HP 8719and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientifi...

Page 225: ...0 B 2 places Figure 10 Side V i m 3 of3 HP 8719 and HP 8720 Replaceable Parts 29 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 226: ...DE STRUT UPPERTOP CORNER 2 SIDE STRUT UPPER Bf3TTOM CORNER 2 SIDE STRUT LOWER 4 REAR PANEL STANDOFF FRONT HANDLE REPLACEMENT 46 HANDLETRIM STRIP IDOVE GRAY FRENCH GRAY PARCHMENT COBBLESTONE I I ptions refer to the matchingtouch up paint Mfr Code Figure 11 Chassis Parts and Touch upPaint 1 of 2 Mfr Part Number 30 Replaceable Parts HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guara...

Page 227: ...Figure 11 Chassis Parts and Touch UpPaint 2 o f 2 HP 8719 and HP 8720 Replaceable Parts 31 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 228: ...A120B LABEL LOCATION DIAGRAM 28480 08720 80002 1 0871940002 3 1 20A LABEL LOCATIONDIAGRAM 28480 08720 80011 Figure 1 2 R e p l a d e Labels 1 of2 32 Replaceable Parts HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 229: ...EL METRICHARDWARE CAUTlON 7121 2527 1 1 I 1 28480 LABEL HAZARDOUSVOLTAGE WARNING 28480 71206999 LABEL LINE VOLTAGE SELECTOR SWITCH 20A LABEL PARALLAXSOFTKM MENU HP 8719 and HP 8720 Mfr Part Number 08753 80002 08753 80074 08753 80001 08753 80080 7121 2527 71204295 7120 6999 08753 80005 Figure 12 Replaceable Labels 2 of 2 Replaceable Parts 33 Artisan Scientific Quality Instrumentation Guaranteed 888...

Page 230: ...YSTEM SERVICE MANUAL i P 8720A CHANGE SUPPLEMENT i P 8720A USER S GUlDE i P 8720A QUICK OPERATlNG GUlDE i P 8720A INTRODUCTORY PROGRAMMING GUlDE i P 8720A QUICK REFERENCEGUlDE 2ONNECTORCARE MANUAL 4N326 PRINCIPLES OF MICROWAVECONNECTOR CARE i P 85052BlD 3 5MM CALIBRATION KIT MANUAL i P 850530 3 5 MM VERIFICATION KIT MANUAL i P 85130D 3 5 MM SPECIAL ADAPTER SET MANUAL i P 850430 SYSTEMRACK MANUAL i...

Page 231: ...n an assembly is replaced adjustment s and or performance tests may be necessary to assure the analyzer meets its published specifications Refer to the Post Repair Procedures section of this manualfor the specific adjustmentsand performance tests to be performed COVER REMOVAL Manyof the disassemblyproceduresinthis sectionrequirethe top portionof the instrumentto be pivoted open or the coversto be ...

Page 232: ...s present on the terminals of the line power module on the rear panel and the LINE power switch whether the switch is ON or OFF The AC line voltage on these terminals can if contacted produce fatal electrical shock Be aware that capacitors inside the instrumentmay remain charged even though the instrument has been disconnected from its AC power source 2 Replacement Procedures HP 8719 and HP 8720 A...

Page 233: ...ashers item 2 exposed by the previous step The bezel item 3 is now free from the frame Remove it Removethe trim strip from the top edge of the front frame by prying underthe strip with a flat screwdriver Removefour screws two from the top edge of the frame and two from the bottom edge of the frame item 4 Disconnectthe ribbon cablefrom the front panel by pressingdown and out on the connector locks ...

Page 234: ...Figure I 4 ReplacementProcedures HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 235: ...2 Removethe bezel s softkey cover item 1 by sliding your fingernail under the left edge near the top or bottom of the cover Pry the softkey cover away from the bezel If you use another tool take care not to scratch the glass 3 Removethe two screws andwashers item2 exposedbythe previousstep The bezel item3 is now free from the frame The bezel is heavy for its size Carefully remove it HP 8719 and HP...

Page 236: ...and washers from the bottomguiderailsof the display Disconnectthe 4 wire bundle not shown from the focus and intensityjacks on the undersideof the display 7 Return the instrumentto the upright position Disconnect the power supply cable item 2 8 Apply fingertip pressure to the rear of the display s frame Slide the display approximately three inchesout of the mainframeto allow access to the largerib...

Page 237: ...Figure 2 HP 8719 and HP 8720 Replacement Procedures 7 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 238: ...item 4 6 Disconnectthe A542 YIG 2 FM C from the A542 connection item 5 Also disconnect the A55J2 YIG 1 FM C from the A55J2 connection item 6 7 Using pliers remove the wire clamps from the two gas springs 8 Lift the A12 reference assembly from its motherboardconnector and disconnect the EXT REF INPUTcoax from A12J3 9 Turn the instrumenton its side NOTE As the instrument is turned on its side the ga...

Page 239: ...HP 8719 and HP 8720 Replacement Procedures 9 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 240: ...d EXT TRIGGER To Removethe Premgulator 14 Removethe remainingfour screws in the rear frame two on the top and two on the bottom items 11and 12 15 Disconnectthe preregulatorribbon cable from the A8 post regulatorboard assembly 16 Pullthe preregulator assembly away from the frame Disconnectthe cable assembly at the J3 preregulator connection to the motherboard To Reassemble 17 To install a new prere...

Page 241: ...HP 8719 and HP 8720 Replacement Procedures 11 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 242: ...connection item 4 7 Disconnectthe J3 IF OUTPUT coax cable item 5 8 Disconnectthe pulse driver cable assembly at the interface board connection item 6 9 Disconnect the A52J1 PULSE DRIVE coax cable item 7 10 Turn the instrument on a side NOTE As the instrument is turned on its side the gas springs will force the two halves of the instrument apart from each other 11 Removethe bottom cover refer to th...

Page 243: ...HP 8719 and HP 8720 A Figure 4 1 of 2 Replacement Procedures 13 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 244: ...Figure 4 2 of2 14 Replacement Procedures HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 245: ...ectthe sampler from the pulse driver at the LO INPUTJ1 connection To Reassemble 17 Reversethe above procedureto reassemble the unit HP 8719 and HP 8720 Replacement Procedures 15 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 246: ...ORT 1coupler bias tee cable item 2 Return the instrumentto the upright position Remove one sampler coupler semi rigid cable for each port item 4 Remove the PORT 2 coupler bias tee semi rigidcable item 5 Remove the screw from the top of the bias tee mounting bracket item 6 Disconnect the two cable assemblies on the front panel board items 7 and 8 Remove four screws on the top and four screws on the...

Page 247: ...t NOTE When replacinga testportconnector refertothe ConnectorCaresectioninthe Operating Manual for connector gage information HP 8719 and HP 8720 Replacement Procedures 17 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 248: ...Figure 5 2of3 18 Replacement Procedures HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 249: ...HP 8719 and HP 8720 Replacement Procedures 19 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 250: ...vethe screw on the top of the mounting bracket item 6 5 Leanthe biasteeltransfer switch assembly backtowards the rear of the instrumentandthen slide it towards the front of the instrument to pull it free NOTE One cable and two screws must be removed for each bias tee that is to be removed To Removethe Transfer Switch 6 Removethe remaining semi rigid cable 7 Removethe two screws that hold the trans...

Page 251: ...section Turn the instrument on its side 2 Removethetwo screwsfrom the mountingbracketunderneaththe A69 step attenuator item 3 Return the instrumentto the upright position 3 Disconnectthe two semi rigid cables at the step attenuator connection items 12 and 13 4 Disconnectthe ribbon cable from the interface board item 14 To Reassemble 5 Reversethe above procedure to reassemblethe unit HP 8719 and HP...

Page 252: ... board labeled A51J18 IF IN item 3 A51J19 ALC OUT item4 A51J20 IFOUT item 5 Disconnectthree cable assembliesfrom the front of the interfaceboard labeled J3 BIAS TEES AND TRANSFER SWITCH item 6 J4 PULSE GEN item 7 J15 B SAMPLER item 8 Disconnecttwo cable assembliesand one ribbon cable from the front of the interfaceboard that are labeled J16 R SAMPLER item 9 J14 A SAMPLER item 10 J2 ATTENUATOR item...

Page 253: ...HP 8719and HP 8720 Replacement Procedures 23 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 254: ...ottom of the instrumentto disconnect the pins from the microswitches To Reassemble 13 Setthe right side of the interface boardinto the boardguides on the right side strut item17 14 Align the six pins from the microswitchassemblyto the socketson the interfaceboard item 18 15 Align the left side of the interface board into the guides on the left side strut 16 Reversethe above procedure starting with...

Page 255: ...9 places HP 8719 and HP 8720 Replacement Procedures 25 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 256: ...I Figure 6 4 of 4 26 Replacement Procedures HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 257: ...lifierconnectionlabeledJ1 item 1 and J2 item 2 3 Disconnect the two semi rigid cables items 3 and 4 at the mixer amplifierconnection 4 Removethe fixed oscillator cable item 5 5 Removethe screw that connects the mixer amplifier bracket to the main deck item 6 6 Slide the mixer amplifier assembly toward the rear of the instrumentand then pull free from the instrument To Reassemble 7 Reverse the abov...

Page 258: ...28 Replacement Procedures HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 259: ...IG 1 FM C item 10 A55J3 YIG 1 MC item 11 Disconnectthe following cables at the YIG 2 connection A541 YIG 2 cable assembly item 12 A W 3 YIG 2 MC item 13 A542 YIG 2 FM C item 14 Remove two screws from the heat sink item 15 Slidethe oscillator assembly toward the front of the instrumentand then straight upto pull it free from the main deck Removefour screws from the heatsink to removeYIG 1 two from ...

Page 260: ...e modulator SWl and YIG 1 SW3 semi rigid cables items 3 and 4 Disconnectthe isolator from SW1 item5 Removethe two screws that attach the mounting bracketto the main deck item 6 Lift the switch assembly straight up to disconnectthe pins Then removethe switch assembly from the instrument Removethe SW2 SW3or the SWl SWP cable dependingon which switch isto be replaced Remove one screw on each end of t...

Page 261: ...Figure 8 HP 8719 and HP 8720 Replacement Procedures 31 32 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 262: ...e 1 lists every replaceable assembly in the instrument The second col umn notes adjustments that should be performed following replacement of an assembly The third columnreferencesthe internaltest or other method usedto verify the proper functioning of the instrumentfollowing repair Generating a new set of error term plots is always a good idea following a major repair Include the new plots in the...

Page 263: ...y VCO Tune Adjustment FrequencyAccuracy Adjustment None None None None None HP 8719A 20B Display Positionand Focus HP 8719A 20B Display lntensityAdjustments Display lntensityand Focus CC Display Image Size Positionand Trace Alignment HP 8719A 20B Display lntensityAdjustments Verification lnternaltests 12 23 and 24 Internaltest I2 System Verification Power Level Self Test Check A8 test point voltag...

Page 264: ...Accuracy Power Level FrequencyAccuracy Power Level FrequencyAccuracy Observation watch LEDs when switchingfrom S11 to 522 Power Level Frequency Accuracy Power Level Power Level System Verification System Verification System Verification AND Power Level System Verification System Verification System Verification Dperator sCheck Operator s Check Operator s Check Dperator s Check Operator s Check Alt...

Page 265: ...N This section documents the HP 8720A 8719A and 87208 separately For each instrument a table lists the changes opposite the serial number prefix of your instrument DETERMINING WHICH INSTRUMENT HISTORY CHANGES APPLY Findthe prefix number rangeyour instrumentfalls into thenfollow the correspondingdirections Actual changes are providedat the end of this section Table la Changesfor the HP 8720A Prefix...

Page 266: ...plement Change B I 2909A or below 29WA or below Tablel c Changesfor theHP 8720B Implement Changes A and B Directions lmplementChange B lmplementChange B lmplementChange B lmplementChanges A and B 2 Instrument History HP 8719 and HP 8720 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 267: ...irectional coupler CHANGE B Change B only applies to HP 8719As with serial prefix numbers of 3025A and below HP 8720Bs with serial prefix numbers of 3019A and below Make the following changes to the ReplaceableParts section Replaceable Parts page 6 ChangeA19 to HPpart number08753 60092 19A 208 GRAPHICSSYSTEM PROCESSOR ASSY ChangeA19 to HPpart number08753 69092 19A 208 GRAPHICSSYSTEM PROCESSOR ASSY...

Page 268: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 269: ... l l see Phase Lock A12 see Reference A13 see Fractional N Analog A14 see Fractional N Digit A15 see Preregulator A16 see Rear Panel A17 see Motheaoard A18 see Display A19 see GSP A51 see Interface A52 see Pulse Generator A53 see MixerIAmplifier A54 See YIG 2 A55 see YIG 1 A58 see Lower Front Panel A57 see Fixed Oscillator A58 see Modulator A59 see Isolator A60 A61 see Bias Tee A62 A63 see Directi...

Page 270: ...am Overall TS 5 BlnputPath ET4 BroadbandPower Problems SRC 13 Cables Replaceable RP Figure 3 Cable Test ACC 5 Cal Coef 1 12 Sys Ver Tests SKM 6 CalibrationCycle VER 24 Cal Kit Def Adjustment Test ADJ 29 CC seeCorrection Constant Certificate of Callbration VER 5 Certificateof Traceablltty VER 5 Chassis Parts Replaceable RP Figure 11 CMOS RAM InternalTest SKM 4 Connectors see Front Panel CCmTrmUE So...

Page 271: ...Softkey SKM 13 Fixed Oscillator Replacement PRP 3 Flowchart Power Supply Troubleshooting PS 2 FN Count InternalTest SKM 5 Foc lnt Cor Adjustment Test SKM 7 Four MHz Check RCV 2 Frac N Cont InternalTest SKM 5 FRACN Softkey SKM 14 FRACNTUNE Softkey SKM 10 Fractional N Analog Replacement PRP 2 Fractional N DigitalAnalog Bus Nodes SKM 20 Fractional NDigltal Replacement PRP 2 Fractional NSpur and FM Si...

Page 272: ...rification ACC 6 OperatingState TS 2 Operator s Check VER 1 Option Cor Adjustment Test SKM 7 Option NumbersCC ADJ 11 Ordering Parts Information RP 2 Overall Block Diagram TS 5 Paint Touch Up RP 30 Peek Poke Menu SKM 12 pEEU Y EAMMESS Softkey SKM 12 pEEK poKE Softkey SKM 12 Softkey SKM 12 PerformanceTest Record PT 29 PerformanceTest Record Option 003 PT30 PerformanceTests SEO 1 PerformanceTest Tool...

Page 273: ...RCV 4 Sampler Replacement PRO 11 PRP 3 Sampler Theory of Operation TO 10 TO 1 7 1 8 TO Sampler Voltage Check RCV 4 Second Converter Check RCV 4 Second Converter Replacement PRP 2 Second Converter Theory of Operation TO 17 Second LO Check RCV 2 SELEcr Softkey SKM 3 MAGNosE Softkey SKM 4 Serlal Cor Adjustment Test SKM 7 Serial Number CC ADJ 10 Service Key Menus SEO 2 SKM 1 S e i c e Menus SKM 1 Serv...

Page 274: ...quence TS 2 Two Port CalibrationProcedure PM 2 UncorrectedPerformanceTable ET Table 2 VCO RangeCheck SRC 5 6 Ver Dev 1 4 System VerificationTest SKM 7 Verification SEO1 Verification Equipment Requiredtor VER 6 VerificatlonKit VER 5 pES Softkey SKM 3 YIG 1Replacement PRP 3 PRO 29 YIG 2 Replacement PRP 2 PRO 29 YIG Check SRC 11 YIG Oscillator Tuningthe TO 11 KEY ACC ADJ DC ET IFG IH PM PRO PRP Acces...

Page 275: ...quipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentation Artisan Scientific Corporation dba Artisan Technology Group is not an affiliate representative or authorized distributor for any manufacturer listed herein We re here to make your life easier How...

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