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TEK RFA300 Service

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1. Down Converter e ALIA LIP DI 1 Data from 0s FIR Filter Resampler Scaling and A D Converter i I P Pilot Offset Estimator er l pi Con atched Filter Pilot Coeficens estimate OA Ampltu EE MEE Scaling PilotPhase Normalization gp Estimator gt BF eiia Pilot Phase 11 Matched SymbolTiming Pilot L Conversion Lfiltering_ L Removal Filtered Unequalized Samples 9 Tsym Tsym 2 Tsym 4 a aoe Filtered Equalized Samples L OY Processing path for Equalizer Tsym Tsym 2 Tsym 4 output samples i without lt Scaling gt rai DIN a Sta Une Ney Filtering EN FIR Unfiltered Equalized Samples E Unfiltered Unequalized Samples Tsym 4 The RFA300 measurement set is designed to provide highly accurate measure ment of the 8VSB signal directly from the transmitter The down converter module processes the applied 8VSB signal and passes it on to the acquisition module and the pilot lock module A block diagram of the down converter module is shown in Figure 3
2. Figure 6 22 Screw locations for the interface circuit board 3 Attach the interface board to chassis with five T15 screws through the front of the board and two metric screws at the side connectors Torque the T15 screws to 8 in Ibs Torque the metric screws to 2 in lbs 4 Route both fan wire harnesses through slot in chassis as shown in Figure 6 23 5 Plug the left side fan wire harness into the interface board J410 left FAN connector as shown in Figure 6 23 6 Plug the right side fan wire harness into the interface board J420 right FAN connector as shown in Figure 6 23 7 Route the speaker wire harness through the top right chassis ventilation hole as shown in Figure 6 23 RFA300 Measurement Set 8VSB Service Manual Maintenance 8 Plug speaker wire harness into interface board J980 connector as shown in Figure 6 23 9 Connect the disk drive flexible circuit board to the interface board disk drive connector e A 9 LZ Q Q 9 U A VET P N D S SS Q 2 3 LA A ai gt lt Ss S 0 Fan connectors Su A 0 5 connector e Figure 6 23 Cut away view showing wire routing of fan and speaker wires 10 Connect the ribbon cable connector from the controller to the in
3. RF Input 1 A 88 50 Ohm External P recision N 1 5 to 17 dB 0 7 MHz 0 Oor Narrow BW E Narrow 2 W 33 dBm Max Narrow BW 0 5 dB steps 30 kHz BW 15dB Narrow BW select me BW 9 2 select RO A select Acquisition 4 select 0 60 dB ae IN signal 10 17 20148 i0 dB ten 100MHz 44 7 Mia 25 dB MHz 4 Vyl Pre Narrow Band gain Bm 9 as v BandGain 1 5 to 17 dB 0 5 O 0 A N dB steps J1 l Input RF dB X D Ay 212 So select Attenuator 10 2 Signal amplitude Present 7dB spond Gai 14 T 4 dB gt approximately 7 dB sil Toac Band Gain greater at Pilot We c 10 76 MHz frequency CW 14 dB Pilot 10 76 MHz To various circuit 250 kHz BW Pilot signal RF Input 2 50 Ohm Internal Precision N 13 dBm Max 0 10 20 MHz MHz Power Interface 12C Control Interface LO Signal T fi 12 164 800 MHz 14 dBm 31 3 dB 1 Supplies controls 12 dB 50 AAA 1 7 J3 OR Figure 3 4 Down converter module block diagram Duplexing Filter The filter following the mixer eliminates the LO signal feedthrough and terminates the mixer sum products Fsb LO while passing the IF frequency Fsb LO The filter passband is set as high as possible to limit the effects of the filter on the 8VSB IF signal Following the filter the signal takes one of two paths depen
4. 258 MHz Keypad Asserrbly Fan Fan IF Signal Flat Panel Display Pilot Signal Audio USB PARALLEL I CDROM ETHERNET 15 Acquisition Controller SVGA 10 76 MHz Clk E 43 05 MHz Clk Hard J8 Disk Power RS232 EMI Filter Drive Supply Figure 9 2 Interconnection block diagram 9 4 RFA300 Measurement Set 8VSB Service Manual EE ee Replaceable Parts This section contains a list of the replaceable modules for the RFA300 Measure ment Set 8VSB Use this list to identify and order replacement parts Parts Ordering Information Module Servicing Module Exchange Module Repair and Return New Modules Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements Therefore when ordering parts it is important to include the following information in your order m Part number m Instrument type or model number B Instrument serial number Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number Change information if any is located at the rear of this manual Modules ca
5. Disconnect the interconnection cables from the acquisition module see Figure 6 3 for connector locations a J4 to of the down converter module b Cable coupling connector between J8 of the acquisition module and J0340 of the pilot lock module cable label 0 Place the removed module on a static free work surface or in a static protection bag 8 to the cable coupling of the cable to J 0340 of the Pilot Lock module Figure 6 3 Acquisition module connector locations Removing the Pilot Lock 1 Module Remove the acquisition module refer to Removing the Acquisition Module on page 6 12 for the removal instructions to gain access to the pilot lock module connectors Remove the holding screws from top and bottom of the pilot lock module rear panel Carefully pull up on the module to loosen it from the backplane connectors When the module is loose from the connectors lift the module up to gain access to the interconnection cables Disconnect the interconnection cables from the Pilot Lock module see Figure 6 4 for connector locations RFA300 Measurement Set 8VSB Service Manual 6 13 Maintenance a Cable coupling connector between J0270 Clock cable label 7 and J1 of the synthesizer module b J0340 43 05 MHz Acquisition clock cable label 0 to the acquisition module J8 already disconnected at the cable coupling connector if the acquisition module is removed c J0440 Pilo
6. CAM Lot Power Interface controls Symbol Lock Hook f 1 Power 12C Interface 9 control Ref Freq X D A 86 MHz Clock Bus Interface 86 097 902 Internal GONG OE DUE UNOSES MHz x240H2 Figure 3 7 Pilot lock block diagram 3 10 RFA300 Measurement Set 8VSB Service Manual Theory of Operation Pilot Lock Input The pilot signal output from the down converter module is a spectrum limited 8VSB signal The signal is limited to a frequency range near the pilot signal at 10 76 MHz the pilot signal frequency in the down converted IF signal The amplitude is limited to set it to a fixed amplitude and then used as the reference signal in a phase lock loop circuit This loop operates with a bandwidth of about 2 kHz and phase locks the 43 05 MHz VCO voltage con trolled oscillator to the fourth harmonic 43 05 MHz of the IF pilot signal frequency Second Phase Lock Loop The second loop of the pilot lock module compares the frequency of the 43 05 MHz VCO to a signal derived from the 86 1 MHz reference oscillator in a frequency phase detection circuit The error signal from this comparison tunes the 10 MHz VCXO in the synthesizer module in a loop bandwidth of about 75 Hz The tuning synchronizes the long term frequency of the 43 05 MHz pilot lock signal and thereby the pilot IF frequency with the 86 1 MHz reference oscillator 86 1 MHz Reference The 86 1 MHz reference is buffered to provid
7. Floppy Drive Tests Keyboard Tests Keypad Tests RS232 Tests Knob Test RFA300 Operationa lU Checks uoce P eS PEDEM seis Load the Performance Verification Software Preparation for Test Procedure hU DM TM TCI EP LO LOW Resonator Check eese L3 Rr tem be LO LOW Resonator Check Procedure Fractional N Synthesizer Check 0 0 00 eee eee Preparation for DGS UMNO EP ER NM ES ides 10 MHz VCXO Frequency Check 86 1 MHz VCXO Frequency Check Input Return Loss Check oco ur eee veld oy RE sy ps Out of Channel Measurement Limits Out of Channel AcCutaCy ceeded ed m a y homero ps Restore Data Files Measurement Set Shut Down esee Adjustment Procedures Equipment Required issi ioo e VES ELE RLVE YS Normalize the RFA300 eb e be Vy LO Low Resonator Check and Adjustment LO Low Resonator Check Procedure LO Low Resonator Adjustment 0 00 0 0c eee eee ee LOW ow Calibration 353 deere ert Nc kLe brides Fractional N Synthesizer Adjustment 0 Preparation for Adjustments
8. 6 8 Recommended Tools 4404455 rage re e e eed 6 9 Removing the Front Panel Bezel 00 0 00 00 0000 eee ee 6 9 Removing RFA300 Cabinet 00 0 0 c eee eee ee 6 9 Replacing the RFA300 Cabinet eese 6 11 RFA300 Application Modules eee eee ee eee 6 12 Removing the Acquisition Module 6 12 Removing the Pilot Lock Module 00 00 0000 00005 6 13 Removing the Synthesizer Module 0 000000 0000 6 15 Removing the Down Converter 6 16 Reinstalling the Down Converter Assembly 6 17 Reinstalling an RFA300 PCI Module 6 18 Mainframe Platform Modules eens 6 18 Removing the Flat Panel Display 6 18 Reinstalling the Flat Panel Display 0 6 19 Removing the Key Pad Assembly 6 20 Replacing the Key Pad Assembly 6 20 Removing the CD and Floppy Disk Drive Assembly 6 21 Removing and Replacing CDROM Drive 6 22 Removing and Replacing the Floppy Disk Drive 6 23 Reinstalling the CD and Floppy Disk Drive Assembly 6 23 Removing Hard Disk Drive 0 0 00 akirus io nii 6 25 Instal
9. 2 5 Figure 2 4 On Stby switch 2 6 Figure 2 5 RFA300 Measurement Set 8VSB front panel 2 9 Figure 2 6 Home Window cece cece cece cece eceees 2 12 Figure 2 7 Toolbar 2 2 13 Figure 2 8 Help menu 2 17 Figure 3 1 Platform block diagram Lees 3 2 Figure 3 2 Simplified block diagram of the RFA300 3 5 Figure 3 3 Software demodulation process 3 6 Figure 3 4 Down converter module block diagram 3 7 Figure 3 5 Acquisition module block diagram 3 8 Figure 3 6 Synthesizer block diagram eese 3 9 Figure 3 7 Pilot lock block diagram eee 3 10 Figure 4 1 RS 232 loop back connector wiring diagram 4 3 Figure 4 2 On Stby switch 4 5 Figure 4 3 Front panel keypad showing highlighted buttons isi sie hee sok Recetas seed EG UE P PEERS 4 6 Figure 4 4 Transmitter connection 4 8 Figure 4 5 Windows95 main screen with cursors at various locations eR RR re debe wee redu 4 10 Figure 4 6 QAPlus WIN WIN Path 4 12 Figure 4 7 Black color test screen 4 14 Figure 4 8 White color test screen
10. 9 0 S o O 040405060 9 0 6506 fe o o 088 E o9 ogo 290868 909090 09990 89850502888 69696969697 8 o9 Earphones USB Keyboard Mouse Figure 2 3 Keyboard and monitor connections RFA300 Measurement Set 8VSB Service Manual 2 5 Getting Started Powering On and Off 2 6 This section contains the procedure for powering on the instrument for the first time To power off the instrument refer to Powering Off on page 2 7 First Time Power Power on the RFA300 measurement set as follows 1 Press the On Standby switch to power on the instrument see Figure 2 4 for the switch location Tektronix RFA 300 Measurement Set SVSB On Stby switch Figure 2 4 On Stby switch 2 Wait for the instrument to complete power on self tests The screen displays an Enter Windows Password dialog box prompting you for a logon name and password However if a password is entered each time you power on the RFA300 measurement set you will be prompted for logon information To avoid this do the following steps a Enter a user name for example RFA300 in the Enter Windows Password dialog box b Click OK but do not enter a password c Click OK in the Set Windows Password dialog box but do not enter
11. Qty This indicates the quantity of parts used Name amp Description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 1 Mfr Code This indicates the code of the actual manufacturer of the part 8 Mfr Part Number This indicates the actual manufacturer s or vendor s part number Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 Mfr Code to Manufacturer Cross Index The table titled Manufacturers Cross Index shows codes names and addresses of manufacturers or vendors of components listed in the parts list Manufacturers cross index Mfr code Manufacturer Address City state zip code 00779 AMP INC CUSTOMER SERVICE DEPT HARRISBURG PA 17105 3608 PO BOX 3608 04956 FUJITSU COMPUTER PRODUCTS OF 2904 ORCHARD PARKWAY SAN J OSE CA 95134 2009 AMERICA INC 05791 LYN TRON INC SOUTH 6001 THOMAS MALLEN RD SPOKANE WA 99204 06009 UNITREK CORPORATION 3000 COLUMBIA HOUSE BLVD SUITE 120 VANCOUVER WA 98661 06915 RICHCO 5825 N TRIPP AVE CHICAGO IL 60646 P O BOX 804238 OADN8 DELTA PRODUCTS CORP DPZ 4405 CUSHING PARKWAY FREMONT CA 94538 0D1M6 TECHNOLOGIES INC 9730 INDEPENDENCE AVE CHATSWORTH CA 91311 0JROS TRIQUEST PRECISION PLASTICS 3000 COLUMBIA HOUSE BLVD VANCOUVER WA 98666 6008 PO BOX 66008 10 2 RFA3
12. CAUTION Use care when touching the EMI shielding strips around the front of A N the chassis The fingers of the strip are easily bent and any protruding sharp edges become a potential cutting hazard when you handle the chassis to position it during the remaining remove and replace procedures Replacing the RFA300 Cabinet E Place the protective front cover on the face of the measurement set Position the measurement set face down on a stable working surface with enough head room to install the cabinet 3 Position the cabinet correctly to install it and slide the cabinet over the end of the mainframe chassis 4 Slide the cabinet evenly down on the chassis making sure all the internal cables are clear and do not catch RFA300 Measurement Set 8VSB Service Manual 6 11 Maintenance 5 When the front of the cabinet comes in contact with the cabinet retaining tabs around the front of the chassis make sure the edges of the cabinet go under the tabs You may have to push on the sides of the cabinet to get all the edges under the tabs and over the EMI strips around the front of the chassis 6 Atthe rear of the chassis you may have to push on the sides of the cabinet to get the rear of the cabinet to fit over the edges of the chassis and EMI gasketing 7 When the cabinet is completely in place on the chassis install the four rear feet 8 Position the handle on the left side of the chassis and replace the two screws
13. 4 15 Figure 4 9 LCD Display with Defects 4 16 Figure 4 10 Run selection in the Start menu 4 20 Figure 4 11 Hwui screen with Synthsizer selected 4 25 Figure 4 12 Return loss test setup 4 28 Figure 4 13 Return loss calculation 4 29 Figure 4 14 Out of Channel Measurement limits test 4 31 Figure 4 15 Out of channel accuracy test setup 4 32 RFA300 Measurement Set 8VSB Service Manual Table of Contents Figure 4 16 Out of Channel measurement accuracy test showing initial second tone amplitude 4 33 Figure 4 17 Out of Channel measurement accuracy showing reduced second tone amplitude eee 4 34 Figure 4 18 Window95 Start window e 4 36 Figure 5 1 Hwui window with Synthesizer selected 5 5 Figure 5 2 Partial Hwui window with Calib selected 5 6 Figure 5 3 Hardware Settings window in Hwui screen 5 7 Figure 5 4 Partial Hwui screen with MFG selected 5 9 Figure 6 1 Right side handle screws 6 10 Figure 6 2 Rear panel feet removal 6 11 Figure 6 3 Acquisition module connector locations 6 13 Figure 6 4 Pilot lock module connector locations 6 14 Figure 6 5 Synthesizer mo
14. 5 Replace the module holding screws to hold the module in the card cage Mainframe Platform Modules The front panel modules do not require the cabinet to be removed to remove and replace them Removing the snap on bezel exposes the attaching screws for the flat panel display and the key pad assembly Removing the flat panel display also permits access to the front panel interface circuit board Removing the Flat Panel flat panel display assembly comes as an assembled and tested unit Remove Display Flat Panel Display assembly as follows 1 Remove the front panel bezel see Removing the Front Panel Bezel on page 6 9 for the removal procedure 2 Remove the six screws attaching the display assembly to the chassis There are two screws at the top two at the bottom and two at the left side of the assembly see Figure 6 8 3 Pull the display assembly away from the chassis to expose the connector to the front panel interface circuit board 6 18 RFA300 Measurement Set 8VSB Service Manual Maintenance 9 Disconnect from Front Panel Interface circuit board Figure 6 8 Flat panel display removal 4 Disconnect the ribbon cable connector from the front panel interface circuit board Reinstalling the Flat Panel sure all of the cables to the interface assembly are properly connec
15. Module Interface gt L Mainframe Platform Figure 3 2 Simplified block diagram of the RFA300 Software Demodulation A diagram of the software demodulation process is shown in Figure 3 3 The first step of the process converts the digitized IF signal to a lower frequency so that the pilot frequency is at zero Hertz The signal is then passed through an RFA300 Measurement Set 8VSB Service Manual 3 5 Theory of Operation Figure 3 3 Software demodulation process 3 6 idealized 8VSB receiver bandpass filter in the complex frequency domain taking into account any small errors caused by the RFA300 hardware The symbol timing is determined and the signal is resampled to create samples that represent the signal amplitude at the instant of each symbol The pilot is subtracted leaving raw data at the correct constellation values A self adjusting equalizer is used to estimate the linear distortion characteristics of the input signal Unflatness and envelope delay distortions within the signal are estimated by using feedback to make the equalizer filter adjustments needed to minimize intersymbol errors Part of this process generates an idealized signal that is used in the desired to undesired power ratio S N calculations The various outputs of the software demodulation process are passed to the measure ment algorithms Pilot 20 Hz Q 0 Fsample 43 05 MHz Tsample Tsymbol 4 Tsample Tsymbol 4
16. Removal and Replacement Instructions 6 8 Replaceable RFA300 Modules The following procedures tell you how to remove and replace the RFA300 Measurement Set 8VSB modules and mainframe components Part numbers for the modules are in the Replaceable Parts List The standard RFA300 Measurement Set 8VSB consists of the following replaceable components Down converter module Synthesizer module Pilot Lock module Acquisition A D module The mainframe unit consist of the following replaceable components Processor module controller board Front panel Interface module Disk drive Power supply module Front panel keypad module RFA300 Measurement Set 8VSB Service Manual Maintenance m Flat panel display m Floppy disk drive CDROM drive assembly m CDROM drive Cooling fans Recommended Tools following tools are recommended for RFA300 Measurement Set 8VSB assembly removal and replacement An anti static wrist strap for safe handling of assemblies containing static sensitive devices B screwdriver with T10 T15 and T20 Torx tips to remove the module mounting screws m A 1 4 inch or larger flat tip screwdriver to remove server side panel screws m An 8 inch adjustable wrench or appropriate size open end wrench Removing the Front Panel Remove the front bezel to permit removal of the flat panel display the key pad Bezel assembly the interface circuit board and the CD floppy disk drive assembly The fro
17. Read Me StartUp amp Touch Screen Utilities Internet Explorer 9 ex Find gt amp 5 Internet Mail 0 amp Internet News i Ha a Microsoft NetMeeting a m MS DOS Prompt amp f The Microsoft Network QJ Windows Explorer Windows Messaging 4 02 PM Figure 4 6 QAPlus WIN WIN Path 3 Wait for the DIAGSOFT window to appear 4 With touch screen or mouse point to and select OK RFA300 Measurement Set 8VSB Service Manual Performance Verification System Board Tests 1 With touch screen point to and select System Board 2 In the Test Selection box select the following tests IC Data Paths Test Calendar Clock Tests NPU Test 3 Deselect all other tests 4 With touch screen point to and select Run Tests 5 When prompted answer the Is the date correct and Is the clock operating questions 6 Wait for the Test Results window to appear a Ifthe Pass completed successfully message appears then point to and select OK b Ifa failure message appears refer the problem to a qualified service person 7 Upon passing the tests point to and select Cancel box LCD Display Polarizer and 1 With touch screen point to and select Video Contamination 2 In the Test Selection box deselect the Li ity Test Checks Inthe Test Selection box deselect the Linearity Test 3 With touch screen
18. Each module comes with a 90 day service warranty For More Information Contact your local Tektronix service center or sales engineer for more information on any of the repair or adjustment services previously described RFA300 Measurement Set 8VSB Service Manual Introduction Contacting Tektronix Phone Address Web site Sales support Service support Technical support 1 800 833 9200 Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA www tektronix com 1 800 833 9200 select option 1 1 800 833 9200 select option 2 Email support tektronix com 1 800 833 9200 select option 3 1 503 621 2400 6 00 a m 5 00 p m Pacific time This phone number is toll free in North America After office hours please leave a voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices RFA300 Measurement Set 8VSB Service Manual xvii Introduction xviii RFA300 Measurement Set 8VSB Service Manual EN ae Specifications This section lists the electrical physical and environmental characteristics of the RFA300 Measurement Set 8VSB The specifications given for return loss and input signal amplitude are for the measurement sets with the 10 dB internal attenuator modification If you have an unmodified RFA300 measurement set with an internal 20 dB input attenuator the
19. floppy disk drive and the CD drive are assembled in the same unit but can the Floppy Disk Drive separately replaced 1 Remove the four cross tip screw holding the floppy disk drive to the assembly 2 Liftthe floppy disk drive up off the chassis as shown in Figure 6 12 Figure 6 12 Chassis screw locations for the floppy disk drive Replace the Floppy Disk Drive 1 Place the replacement floppy drive onto the chassis CD drive as shown in Figure 6 12 2 Attach the floppy drive to chassis with four crosstip screws Torque each screw to 2 in Ibs Reinstalling the CD and When the CD and Floppy drive assembly is assembled it can be reinstalled into Floppy Disk Drive chassis Assembly 1 Align the assembly with the slot in the chassis 2 Connect the CD drive cable to the CD drive connector adapter board RFA300 Measurement Set 8VSB Service Manual 6 23 Maintenance 3 Slide the assembly into the compartment and line up the attaching screw holes 4 Install the three attaching screws two in the front and one in the rear of the assembly 5 Attach the audio cable to CD drive four pin connector a Align the audio cable white colored dot with pin 1 of CD drive four pin connector b Plug the audio cable onto the CD drive connector see Figure 6 13 6 Attach the floppy drive cable to the floppy drive connector a Lift up floppy drive locking latch b With the contacts of the short end of floppy driv
20. i e y e decd eS Pen CER REESE TES 10 MHz VCXO Frequency Check 0 0 000000 e eee ee 10 MHz VCXO Frequency Adjustment 86 1 MHz VCXO Frequency Check creces y pn 86 1 MHz VCXO Frequency Adjustment Calibrate the Touch Restore Data Files Maintenance Preparation Handling Static Sen Sas ubi REN NEN NU ILLE re rers sitive Components cenos EE AE RAE I a ade aes Preventive Maintenance oss acnee nenie nonae i RR RR I I e Exterior of Instrument RR III Display Compact Disc Drive da dee eae wee reto Keyboard Mouse Interior In Case of Problems RFA300 Measurement Set 8VSB Service Manual 4 13 4 13 4 15 4 17 4 17 4 18 4 19 4 20 4 21 4 21 4 22 4 23 4 24 4 24 4 25 4 25 4 26 4 27 4 28 4 30 4 31 4 36 WOOD C 5 11 6 1 6 2 6 2 6 3 6 3 6 3 6 4 6 4 6 5 Table of Contents I rrobral PL 6 5 Software Problems REC hire e oben dde 6 5 Hardware Problems pr Rd RESI FER eer Ea REA 6 6 Checking the Power Supply Module 0 0 0 0 e eee eee 6 8 Removal and Replacement Instructions 6 8 Replaceable RFA300 Modules
21. 0791 00 650 3761 00 ST 91420AG MHF 2021AT MHF 2032AT 119 6232 60 407 4515 01 210 0910 00 FCRC 21C FCRCS 21B 4 211 0895 00 671 4126 01 NMB 4715KL 04W B10 P 00 10 7 Replaceable Parts Figure 10 2 Mainframe parts RFA300 Measurement Set 8VSB Service Manual 10 8 Replaceable Parts Replaceable parts list Fig amp index Tektronix part number number 10 3 1 174 3785 00 2 174 3886 00 3 174 3899 00 4 174 3873 00 5 174 3872 00 6 174 3865 00 7 174 3864 00 8 174 3795 00 9 174 3786 00 174 3786 01 10 174 3875 00 1 174 3784 00 12 174 3814 00 13 174 3789 00 14 174 3787 00 15 174 3887 00 16 174 3967 00 17 174 3863 00 18 174 3788 00 174 4228 01 Qty Name amp description CA ASSY SP ELEC RIBBON CD DRIVE IDC 44 12 0 L RCPT FEMALE STR 2 X 22 0 079 CTR 2MM 30 GOLD CA ASSY SP RIBBON IDC 34 28 AWG 1 125 L 3M 33665 34 CABLE 2 X 17 FEMALE RTANG 0 100 CT CA ASSY SP ELECTRIC CPD 4 26 AWG 14 0 L BOX FEMALE 1X 4 STR LATCHING AMP 103958 3 BOTH ENDS CA ASSY RF COAXIAL RFD 1 50 OHM RG316 10 0 L SMA PLUG RTANG X MMCX PLUG STR CA ASSY RF COAXIAL RFD 500HM RG316 20 0 L MMCX PLUG STR X SMA PLUG RTANG CA ASSY RF RFD 1 RG174 50 OHMS 14 0 L MMCX STR TO MMCX STR CA ASSY RF RFD 1 RG174 50 OHM 10 0 L MMCX STR TO MMCX STR C
22. 1 TX 2 TX 3 RX 4 NC 5 NC 6 RX 7 NC 8 NC DB 9 female connector C form relay contacts change state upon an alarm condition Contact Ratings Pin assignments 1 Normally open 3 Common 5 Normally open 28 V 2A maximum RFA300 Measurement Set 8VSB Service Manual 1 13 Specifications Power Characteristics Table 1 7 AC power source characteristics Characteristic Source Voltage Fuse Rating Maximum Power Consumption Steady State Input Current Inrush Surge Current Power Factor Correction Description Range for the line voltage needed to power the RFA300 measurement set to meet performance requirements 90 VAC to 250 VAC RMS 47 Hz to 63 Hz continuous range CAT 8 A Fast 250 V 540 Watts max 170 Watts typical 6 Amps max 1 9 Amps RMS typical 65 Amps maximum Yes Environmental Characteristics Table 1 8 Environmental characteristics Characteristic Cooling airflow Required Clearance Use Rating Atmospherics Temperature Operating meeting accuracy specifications Operating without damage Non operating Humidity Operating Non operating 1 14 Description Intake is from the front and sides of the instrument Exhaust is to the bottom and rear of the instrument 2 in 50 mm air space adjacentto the bottom of the instrument is required Rated for indoor use only 0 C to 45 C 32 F to 113 30 C hr max gradient non condensing derated 1
23. 50 dBm 7 Check the counter measurement for the following conditions a Ifthe counter measurement is greater than 399 997 500 Hz and less than 400 002 500 Hz the 10 MHz VCXO does not need to be adjusted b Ifthe counter measurement is not within the frequency range limits given continue with the 10 MHz VCXO adjustment procedure 10 MHz VCXO Frequency If the 10 MHz VCXO Frequency is not within the limits given above use the Adjustment following procedure to adjust the frequency 1 In the Hwui window select MFG see Figure 5 4 Use the mouse cursor to select Synthesizer 10 MHz VCXO Calibration Push Start The 10 MHz VCXO Calibration menu will appear gt gt P Use the arrow keys to move the frequency to the value closest to 400 000 MHz The minimum error will be less than 100 Hz pi Push NvSave to save the new DAC value 6 Push Cancel This does not cancel the value saved in step 5 7 When the Done dialog box appears select OK fie Hei Synthesizer Program Flash Synthesizer LO LO W Calibration Synthesizer 10 MHz VCXD Calibration Pilot Lock 86 MHz VCXO Calibration Figure 5 4 Partial Hwui screen with MFG selected RFA300 Measurement Set 8VSB Service Manual 5 9 Adjustment Procedure 86 1 MHz VCXO Frequency Check 86 1 MHz VCXO Frequency Adjustment 1 Setthe center frequency of the spectrum analyzer to 430 489 510 Hz In the Hwui window select the Hw Setting menu 3 Scroll down th
24. 8 Auto Averaging Check W Low Power Mode Uncheck Click OK to exit the Advanced Controller Options dialog box Click Reset button in Interface Configuration Options dialog box Click OK to exit the Interface Configuration Options dialog box Click the Calibration button Click the Calibrate button to calibrate the touch screen and follow instruc tions Click OK to end the calibration Click Exit to end the configuration utilities This procedure adds the driver for the PCI SCSI Bus Controller To add the driver do the following steps 1 Insert the CD ROM labeled RFA300 Measurement Set 8VSB Application Software into the CD ROM drive Open My Computer Control Panel and double click on the System icon Select the Device Manager tab and remove PCI SCSI Bus Controller listed under Other devices Restart the instrument When Windows starts up it will find the new device and ask to install the driver for the PCI SCSI Bus Controller Click the Next button to continue Windows will not be able to find the driver Click the Other Locations button and enter the path as D DRIVER Symbios Click OK to continue Windows will find the driver for the device Symbios Logic 8600SP PCI SCSI Adapter Click Finish to continue Select D DRIVER Symbios when asked for the Symbios Logic 8XX Install Disk directory 10 After the driver is installed restart the instrument To add the driver for the PCI Ethernet Controller do t
25. Click Open Click Next Select the Startup folder Click Next 10 Enter RFA300 for the shortcut name 11 Click Finish 12 Click OK to exit the Properties dialog box Completing the complete the software installation procedure perform the following steps Installation Double click the Mfg Cleanup icon on the desktop Click Yes to confirm the operation Click OK to accept if a warning about removing the Knobtest icon is displayed Select Yes I want to restart my computer now The instrument will restart and the software will initialize at startup RFA300 Measurement Set 8VSB Service Manual 6 53 Maintenance 6 Click OK on all RFA300 warnings about default setups limits and results databases 7 Remove the CD ROM labeled RFA300 Measurement Set 8VSB Application Software from the CD ROM drive and store it with the other backup software for the instrument This concludes the software installation for the RFA300 measurement set 6 54 RFA300 Measurement Set 8VSB Service Manual Maintenance Repacking for Shipment If a instrument is to be shipped to a Tektronix field office for repair attach a tag to the instrument showing the following W Owner s name and address Serial number m Description of the problem s encountered and or service required The RFA300 Measurement Set 8VSB is shipped in cartons designed to provide it with the maximum protection If you ship the instrument subsequently
26. Converter Assembly facing you 2 Insert the three screws that attach the down converter assembly to the side of the chassis before you lift the down converter into position to install it 3 Liftthe down converter into position to line up the three screw holes in the down converter with the screws in the chassis and start the screws Do not tighten yet 4 Install the two attaching screws at the rear of the chassis and the three screws at the front of the down converter module Tighten all the screws 5 Route and reconnect the interconnection coaxial cables to the down converter module see Figure 6 7 for the connector locations RFA300 Measurement Set 8VSB Service Manual 6 17 Maintenance a IF signal cable label 1 from J4 of the acquisition module b J2 Pilot signal cable label 2 from J0440 of the pilot lock module c J3LO input cable label 3 from J3 of the synthesizer module d J4 internal input cable label 4 from J0580 of the pilot lock module e J24 data from the synthesizer module J7 m J5 power connector m Reinstalling an RFA300 PCI Module Insert the module into the card cage at the correct slot position Route and reconnect the module interconnection cables refer to the module removal instructions for a list of the connections to reconnect 3 Carefully align the module edge connector with the backplane connectors 4 Apply firm pressure to completely seat the module in the connectors
27. LO 1 out TL UA 3d 3 dB oe J7 ontro indicator D 10 MHZ Lo m 7 Measurement 10 MHz Tune Synth zs Hook L Ox lt Y hi Band j2 1 8 10 MHz 1248 VCXO AJ Frac N Ref 500 829 MHz 2 Source UT o in 10 MHz Synthesizer Clock 400 500 MHz L 1 1dB SA8025A Synthesizer power rails To Main Loop N lt 20 MHz Synth AAA various gain 20 MHz circuit LO isi Y 20 MHz i Power controls V Fio Tune Volts lt ND Loop gann Interface I 10 dB Power PCI amp 2 control Interface main Lo Tune Mah 0 Low 20 22 MHz Bus Vols 00 hook une a ats 7 Loop BW J Interface EHE Figure 3 6 Synthesizer block diagram Phase Lock Loop Circuits The main loop circuit feedback path is the divide by N counter followed by a phase frequency detector A 20 MHz to 22 MHz VCO voltage controlled oscillator provides the reference to the phase frequency detector The main loop is fairly wideband and provides the necessary control to minimize the phase noise generated by the high frequency local oscillators RFA300 Measurement Set 8VSB Service Manual 3 9 Theory of Operation The 20 MHz phase lock loop circuit uses a fractional N synthesizer and a 10 MHz VCXO voltage controlled crystal oscillator to control the frequency of the 20 MHz oscillator This loop c
28. OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Service Assurance If you have not already purchased Service Assurance for this product you may do so at any time during the product s warranty period Service Assurance provides Repair Protection and Calibration Services to meet your needs Repair Protection extends priority repair services beyond the product s warranty period you may purchase up to three years of Repair Protection Calibration Services provide annual calibration of your product standards compliance and required audit documentation recall assurance and reminder notification of scheduled calibration Coverage begins upon registration you may purchase up to five years of Calibration Services Service Assurance Advantages W Priced well below the cost of a single repair or calibration m Avoid delays for service by eliminating the need for separate purchase authorizations from your company m Eliminates unexpected service expenses For Information and Ordering For more information or to order Service Assurance contact your Tektronix representative and provide the information below Service Assurance may not be available in locations outside the United States of America Name VISA or Master Card number and expiration Company date or purchase order number Address Repair Protection 1 2 or 3 years City State Postal code Calibration Services
29. The information included in this manual explains how to verify service troubleshoot and repair the system to the module level Specifications describes functional characteristics and performance require ments for the RFA300 Measurement Set 8VSB Operating Information tells you how to install and operate the instrument Theory of Operation provides descriptions of the RFA300 measurement set modules Performance Verification describes how to verify the functional performance of the RFA300 measurement set Adjustment Procedures gives the field adjustment procedures Maintenance contains the following information m How to safely handle static sensitive modules and components m How to remove and replace modules m Diagnostic and troubleshooting information and procedures Options provides a brief description of the available options for the RFA300 measurement set Replaceable Parts List gives all module and mechanical parts that comprise the RFA300 measurement set Parts are identified on an indexed illustration to make them easier to identify RFA300 Measurement Set 8VSB Service Manual xiii Preface Related Manuals Manual Conventions xiv TheRFA300 Measurement Set 8VSB user documentation consists of the following m The RFA300 Measurement Set 8VSB User Manual details how to operate this RF measurement system The following terms and conventions are used throughout this manual The term measurement set is used
30. perform the following checks a Check that there are no dark spots bright spots or any other defects that effect the red color of the screen b Check that the screen intensity appears even with no locations where the red color is missing Refer to Figure 4 9 for possible defects RFA300 Measurement Set 8VSB Service Manual 4 15 Performance Verification c Ifdefects are found refer the problem to a qualified service technician Entire line of pixels Dark spot missing Brightspot Red Color Test Is the screen red Color may appear as gray on mono VGA Figure 4 9 LCD Display with Defects 4 Move the color test window to the top right hand corner of screen a Move the cursor to the blue colored title bar with the mouse b Press and hold the mouse select button c Move the window to the top right hand corner of screen by moving the mouse d Release the mouse select button Repeat the checks made in step 3 for the blue screen Upon passing checks point to and select the Yes box Repeat step 2 through step 5 for the green pixels in the Green Color Test Upon passing checks point to and select the Yes box wog oA Repeat step 2 through step 5 for the blue pixels in the Blue Color Test 4 16 RFA300 Measurement Set 8VSB Service Manual Performance Verification 10 Upon passing the checks point to and select the Yes box 11 In the Test Results window point to and select OK 12 P
31. typical Color LCD NEC TFT NL6448AC33 24 Typical 150 1 Color NEC TFT NL6448AC 33 24 59 94 frames sec max non interlaced Table 1 5 Front panel interface characteristics Characteristic Description Mouse Port PS2 compatible mouse port utilizing a mini DIN connector Pin assignments 1 data 4 45V 2 NC 5 clock 3 ground 6 NC Keyboard Port PS2 compatible keyboard port utilizing a mini DIN connector Pin assignments 1 data 4 45V 2 NC 5 clock 3 ground 6 NC USB Port Series A USB receptacle Pin assignments 1 Vbus 3 Data 3 data 4 GND Touch Panel Standard 10 4 in touch panel pointing device mounted on the surface ofthe TFT display connecting to the Front Panel Interface Board RFA300 Measurement Set 8VSB Service Manual 1 11 Specifications Table 1 6 Rear panel interface characteristics Characteristic Description Parallel Interface P ort Port supports standard Centronics mode Enhanced Parallel Port EPP or Microsoft high speed mode ECP and utilizes a 36 pin high density mini D connector Compliant with IEEE P 1284 C D2 for bi directional Parallel Peripheral Interface for P ersonal Computers draft style 1284 C Pin assignments for compatible mode 1 BUSY 19 GND 2 SLCT 20 GND 3 ACK 21 GND 4 ERR 22 GND 5 PE 23 GND 6 DO 24 GND 7 01 25 GND 8 D2 26 GND 9 D3 21 GND 10 D4 28 GND 11 D5 29 GND 12 D6 30 GND 13 D7 31 GND 14 INIT 32 GND 15 STB 33
32. use option 3 to remove them 6 From the FDISK Options page select option 1 to go to the Create DOS Partition or Logical DOS Device page and then select option 1 to Create Primary DOS Partition 7 Select Y when asked Do you wish to use the maximum available size for a Primary DOS Partition and make the partition active 8 Press ESC to exit FDISK 9 Restart the RFA300 measurement set Formatting the Hard Disk You must perform the format after you replace the hard disk or when the partitioning or the format of the hard disk has been damaged If you find that you need to format the hard disk make sure that you have backup copies of your user files if possible so that you can reinstall them later To format the hard disk type A FORMAT C from the command prompt Installing the Software The following procedures assume that the hard disk is properly formatted and partitioned Windows 95 0582 To install Windows 95 software complete the following steps Installation Procedure V 1 Power on the RFA300 measurement set if it is not already on RFA300 Measurement Set 8VSB Service Manual 6 41 Maintenance 6 42 gt wog ou 11 12 13 14 15 16 17 18 19 20 21 Type mkdir C WIN95 from the command prompt to create a directory for Windows 95 files Insert the Windows 95 OSR2 CD ROM From the command prompt type XCOPY D WIN95 C WIN95 s v to copy all the files to h
33. 1 Disconnect the external signal cable from the Down Converter assembly Converter Module Remove the mainframe cabinet see Removing the RFA300 Cabinet on page 6 9 for the removal procedure The down converter module is located in the bottom compartment of the RFA300 mainframe chassis WARNING Do not pull on or twist the heat sinks located near the center of the down converter circuit board You can break the component leads to the circuit board 3 Disconnect the interconnection coaxial cables from the down converter module see Figure 6 7 for the connector locations a J1 IF signal cable label 1 to the acquisition module J4 b J2 Pilot signal cable label 2 to J0440 of the pilot lock module c J3LO input cable label 3 to J3 of the synthesizer module d J4 internal input cable label 4 to J0580 of the pilot lock module 6 16 RFA300 Measurement Set 8VSB Service Manual Maintenance e J24 data to the synthesizer module J7 f J5 power connector LO input To Pilot Lock module Primary input 2 J3 WARNING Do not twist or pull on these heat sinks o IF to Acquisition module J 5 Power J 24 Data Internal input Figure 6 7 Connector locations on the down converter module 4 Remove the eight screws holding the down converter assembly to the mainframe chassis E Reinstalling the Down Position the mainframe with the left side down and the bottom of the chassis
34. 6 25 Placement of bottom spacer pad in inner shipping lone ER 6 56 Figure 6 26 Repackaging the RFA300 measurement set 6 58 vii RFA300 Measurement Set 8VSB Service Manual Table of Contents List of Tables viii Figure 9 1 RFA300 Measurement Set 8VSB block diagram 9 3 Figure 9 2 Interconnection block diagram 9 4 Figure 10 1 Replaceable PCI modules 10 5 Figure 10 2 Mainframe parts 10 8 Figure 10 3 Cables 1 ner n mh Res hah er ocean 10 10 Figure 10 4 Cabinet parts and accessories 10 12 Table 1 1 Input specifications 1 2 Table 1 2 Measurement specifications eee 1 4 Table 1 3 Processor system characteristics 1 9 Table 1 4 Display system characteristics 1 10 Table 1 5 Front panel interface characteristics 1 11 Table 1 6 Rear panel interface characteristics 1 12 Table 1 7 AC power source characteristics 1 14 Table 1 8 Environmental characteristics Lee 1 14 Table 1 9 Dynamics 1 15 Table 1 10 Transportation 1 15 Table 1 11 Certifications and compliances 1 16 Table 1 12 Mechanical characteristics eese 1 1
35. 672 1506 00 672 1506 01 10 211 0950 00 11 407 4512 00 407 4721 01 12 671 4377 00 13 348 1432 00 14 119 5728 00 15 119 5677 00 119 5677 01 119 6106 00 16 614 0943 00 614 0943 01 614 0943 02 334 9592 01 10 6 Serial no effective B0101094 B010168 Serial no discont d 80101094 B010167 Qty 80 Name amp description SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR CIRCUIT BD ASSY BACKPLANE BD 679 4123 00 TESTED 389 2405 00 WIRED CONN HARDWARE DSUB JACK SCREW 4 40 X 0 3121 HEX HD STL CD PL W 2 FLAT WASHERS 1 LOCK WASHERS SCREW MACHINE 6 32 X 0 375 PNH STL CDPL T 15 TORX DR CABLE CLAMP RIBBON 1 0 X 1 0 GRAY POLYVINYL W URETHANE FOAM TAPE BACKING RETAINS 6 RIBBON C CIRCUIT BD ASSY RS32 EMI FILTER 679 4544 00 TESTED 389 2684 00 WIRED DRIVE SUBASSY DISK FLOPPY CD DRIVE SUBASSY DISK FLOPPY CD SCREW MACHINE M2 6 X 0 45MM PITCH X 4 0MM L PHILIPS PNH FOR FLOPPY DISK DRIVE CIRCUIT BD ASSY MODULE DOWN CONVERTER 671 4234 00 CIRCUIT BD ASSY MODULE DOWN CONVERTER 671 4234 01 SCREW MACHINE M2X3MM PHL PNH STL NI PL FOR CD OPTICAL DRIVE BRACKET ASSY DRIVES MOUNTING 0 040 ALUMINUM ALLOY 5052 H34 SPOTWELDED ASSY SAFETY CON BRACKET ASSY DRIVES MOUNTING 0 040 ALUMINUM ALLOY 5052 H34 SPOTWELDED ASSY SAFETY CON CIRCUIT BD ASSY CD ROM INTERFACE 679 4377 00 TESTED 389 2561 00 WIRED STAGECOACH FOOT RUBBER 6 5MM
36. 7 dB f 12dB 2222 RAM 512KB 1 em SA AD NC BandGain 15to17cB 5w ae NN ft S 0 5 cB steps Input RF WA select Attenuator 7 HiH gt LO m N Present Broad Band Gain VO Actress 9dB Decoder 14 gt Pilot 10 76 MHz 906 pus A RF Input 2 i Supplies il 12 cB PCI Transceivers 50 Ohmintemal m TEM gt 10 20 Pilot F N Precision N dics lt MHz MHz Power Interface Control Interface y e i 13 dBmMex 413cB oy LOSignal C ge To rove Ty 24 TRE Pilot Lock Module LO A out level amp indicator La Pilot Loop rm LO at level a gt gain i indicator Pilot Lock 19 1 signal lt X m J 0460 Eb Clanp A _ t Tune Volts AD 5 RO 10 76 MHz gt Clock 4 Y a Acquisition 43 05 MHz x BW Acquisition we ctm Wide Clock J 0340 O m e Ji 3 Bi 10 76 MHz 9e _ J 0270 Clock 2 Narrow 258 MHz AN 43 05 MHz Clock Intemal rails TU Circuit To various circuit 2 ww NR Interface controls P Interface 0580 CMT confrols Symbol Lock Hook 1 B PCI amp 1 C 2 Interface J 0480 control Interface contol Ref Freq D A Bus Interface Bus Interface 86 097 902 MHz Internal 240 Hz Figure 9 1 RFA300 Measurement Set 8VSB block diagram RFA300 Measurement Set 8VSB Service Manual Front Panel Interface
37. GND 16 SLIN 34 GND 17 AFD 35 GND 18 HLH 36 PLH See IEEE P1284 C for pin connection definitions for other modes Serial Interface Port On circuit card 9 pin male D sub connector to support RS 232 485 serial port Compliant EIA TIA 574 ti ket Pin Assignments RS232 1 DCD 6 DSR 2 RXD 7 RTS 3 TXD 8 CTS 4 DTR 9 RI 5 GND Pin Assignments RS 485 1 RXD 6 CTS 2 7 RTS 3 TXD 8 CTS 4 TXD 9 RTS 5 1 12 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 6 Rear panel interface characteristics Cont Characteristic Serial Interface Port on back panel Description 9 pin male D sub connector RS232 Pin Assignments RS 484 1 RXD 2 RXD4 3 TXD 4 TXD 5 GND 6 CTS 7 RTS 8 CTS 9 RTS SVGA Output P ort USB Port Ethernet P ort Alarm Contacts 15 pin female high density D sub SVGA connector Compliant with EIA RS 343A Selectable 640 X 480 VGA 800 X 600 and 1024 X 768 SVGA When internal display is active VGA mode must be selected for this SVGA output port Pin assignments 1 Red 2 Green 3 Blue 4 NC 5 GND 6 AGND 7 AGND 8 AGND Series A USB receptacle Pin assignments 1 Vbus 2 Data 9 key 10 GND 11 NC 12 NC 13 HSYNC 14 VSYNC 15 NC 3 Data 4 GND 10 Base T 100 Base T on PCI bus RJ 45 Connector Plug amp Plan compatible Bus master mode RJ 45 Pin assignments
38. Installing other applications on the hard disk m Installing the RFA300 application and drivers The following lists the software components that you installed m Microsoft Windows 95 OSR2 m Cirrus Logic GDS7555 Driver m Dynapro SC3 Touch Screen Driver m Symbios 53C860 SCSI Driver m DEC DC21X4 NDIS 4 0 Driver m DiagSoft QAPlus WIN WIN version m Tektronix JPS software m Tektronix RFA300 application software and drivers This procedure assumes that you have the following m An RFA300 Series Windows 95 Startup Disk m RFA300 CD ROM titled RFA300 Measurement Set 8VSB Application Software A non partitioned low level formatted hard disk installed in the RFA300 measurement set m A Windows 95 OSR2 CD ROM RFA300 Measurement Set 8VSB Service Manual Maintenance Preparing the Hard Disk If you are installing software on a new hard disk you must partition and format the hard disk If you are reinstalling software it is not necessary to partition unless the partition has been damaged however you must reformat Partitioning the Hard Disk partition your hard disk complete the following steps 1 Power off the RFA300 measurement set 2 Insert the RFA Series Windows 95 Start Up Disk in the floppy drive and then turn on the power 3 From the command prompt type A FDISK 4 Select N when asked Do you wish to enable large disk support 5 Select option 4 to view partitions on the fixed disk If there are any
39. Measurement Set 8VSB Service Manual Maintenance 3 4 Connect the key pad assembly interconnection ribbon cable to the key pad connector on the front panel interface circuit board see Figure 6 10 Install the six attaching screws Power supply Fan Keypad Floppy CD Stereo Display CPU Speaker Figure 6 10 Front panel interface circuit board connectors Removing the CD and cabinet front bezel display assembly and keypad assembly must be Floppy Disk Drive uninstalled to remove the CD and disk drive assembly for service Remove the Assembly CD and Floppy Disk drive assembly as follows 1 Remove the mainframe cabinet see Removing the RFA300 Cabinet on page 6 9 for the removal procedure Remove the front panel bezel refer to Removing the Front Panel Bezel on page 6 9 for the removal procedure Remove the display assembly refer to Removing the Flat Panel Display on page 6 18 for the removal procedure Remove the key pad assembly refer to Removing the Key Pad Assembly on page 6 20 for the removal procedure Remove the three screws attaching the CD and Floppy Disk Drive assembly to the chassis There are two screws on the front of the assembly and one on the rear inside the front panel compartment
40. W X 43 50MM L 2MM THK RUBBER BLACK INSTRUMENT SUPPORT APPARATUS P5200 DISK DRIVE OPTICAL 644MB CD ROM 16 7 MB SEC IDE ATAPI CD 224E 903 DISK DRIVE FLOPPY 3 5 INCH 1 44MB BLACK 0 5 INCH HIGH DSDD FD 04HF 2300 DISK DRIVE FLOPPY 3 5 INCH 1 44MB GRAY 0 5 INCH HIGH DSDD 101 6 X 110 X 12 7MM FD 04HF 2300 DISK DISK DRIVE FLOPPY 3 5INCH 1 44 MB 0 5 IN HIGH BLACK BEZEL DDDS 96 X 126 X 12 7MM FD 05HF563 KEYPAD ASSY KEYPAD ASSY KEYPAD ASSY MARKER IDENT OVERLAY Mfr code OKBO1 80009 OKBO1 OKBO1 52152 80009 80009 80009 OKBO1 80009 80009 OKBO1 TK1943 TK1943 80009 TK2411 50356 50356 50356 TK2250 80009 80009 80009 Mfr part number ORDER BY DESCRIPTION 671 4123 00 131 0890 00 ORDER BY DESCRIPTION 80610029243 3484 1000 671 4544 00 650 3829 00 650 4061 00 26C4MXPHY 672 1506 00 672 1506 01 0310248 0 407 4512 00 407 4721 01 671 4377 00 348 1432 00 CD 224E 903 FD 04HF 2300 FD 04HF 2300 FD 05HF5630 614 0943 00 614 0943 01 614 0943 02 RFA300 Measurement Set 8VSB Service Manual Replaceable Parts Replaceable parts list cont Fig amp index number 17 18 19 20 21 22 23 24 25 26 21 28 29 30 Tektronix part number 344 0790 00 200 4384 01 334 9582 00 352 1068 00 366 0791 00 650 3761 00 119 5683 00 119 6061 00 119 6232 00 119 6232 60 407 451
41. and Enhanced Accuracy and in the toolbar select High Smoothing 3 Set the RFA300 measurement set to any frequency within the measurement range of the set For example use 686 MHz 4 Set the RF signal generator carrier frequency to 2 67 MHz above the RFA300 measurement set frequency To set it for the example given in step 4 set the generator for 688 67 MHz 5 Setthe signal generator for frequency modulation of the carrier at 100 KHz with a deviation of 80 kHz sine wave modulation 6 Set the signal generator for an RF output power of 13 dBm RFA300 Measurement Set 8VSB Service Manual 4 31 Performance Verification 7 Setup the second signal generator for a CW output at 12 MHz below the first signal generator For the example frequency in step 4 set the second frequency generator to 676 67 MHz 8 Setthe output power of the CW signal generator at 7 dBm 9 Use a6 dB resistive splitter combiner and the necessary 50 coaxial cables and connector adapters to combine the two frequency generator signals 10 Connect the signal generators combiner and RFA300 measurement set as shown in Figure 4 15 FM signal generator RFA300 Analyzer Rear panel RF input connector 50 coaxial cable CW Signal generator 50 Q coaxial cable S plitter C ombiner 50 coaxial cable Figure 4 15 Out of channel accuracy test setup 11 Start the Out of Channel measure
42. dragging the cursor to the lowest volume level setting d Release the select button Plug a stereo headset into the measurement set headphone jack located on the left side panel above the keyboard jack Use the mouse cursor to increase the volume level while listening for tunes from both headphones Check the stereo balance control using the following procedure a Click on CD Player and then click on Volume Control b Shift the volume control balance lever to full right and verify that only the right headphone has sound RFA300 Measurement Set 8VSB Service Manual 4 11 Performance Verification c Shiftthe volume control balance lever to full left and verify that only the left headphone has sound 11 Shift the volume control balance lever back to the center position 12 Point to and select the box to close the Volume Control window 13 In the taskbar click on the CD Player task label 14 In the CD Player window click on Disc and select Exit 15 Select Exit to close the CD Player window 16 Remove the CD disc from the CD drive 17 Close the CD drive drawer 18 Disconnect the headphones from the headphone jack Selection Booting of QAPlus WIN WIN Program 4 12 1 Select the Windows95 menu by touching the Start icon 2 With the touch screen follow the path shown in Figure 4 6 J RFA 300 Accessories GS My T Touch Online Services QAPlus_V QAPlus WIN HWIN Help
43. drive A Be sure that the QAplus disk is not write protected Open My Computer Control Panel and double click Add Remove Programs Select Install and follow the directions The Install program will inform you that it intends to create the directory C win win on your hard disk and it will ask you to approve or enter an alternative location Click Continue to approve this directory name Enter user information when prompted RFA300 Measurement Set 8VSB Service Manual 6 47 Maintenance 6 48 Installing Tektronix JPS Software NOTE If you are using a set of QA Plus disks that have been previously installed you will not be able to enter the name You will be warned that these disks have been installed previously and you must acknowledge that fact before proceeding 10 11 12 13 A dialog box will appear asking if it is OK to create a set of Icons for the Program Manager for QAPlus diagnostics Click Create to approve this When the installation is complete the release notes are displayed Read the notes and exit Press the Ctrl Alt Del keys to display a list of current tasks Select the QAPlus Installation task and click the End Task button After several seconds another dialog box will appear advising you that the application is not responding Click End Task again to end the QA Plus installation Close the Program Manager folder icon located at the bottom of the screen when the desktop reappears Ins
44. following procedure to remove the interface board and Replacement 1 Remove the flat panel display see Removing the Flat Panel Display on page 6 18 for the procedure Disconnect the speaker wire from the interface board J980 connector see Figure 6 23 Disconnect the right side fan wire from the interface board J420 right FAN connector Disconnect the left side fan wire from the interface board J410 left FAN connector Disconnect the disk drive flexible circuit board from the interface board disk drive connector a Release the locking latch on the flexible circuit board connector b Pull the flexible circuit board straight out of the connector Release bar LL Disconnect the controller ribbon cable from the interface board Disconnect the key pad assembly ribbon cable from the interface board Remove the five T15 screws from the front of the board and the two metric screws on the left side that attach the interface board to the chassis see Figure 6 22 for the screw locations Reinstall the Interface Board Install the interface board onto the mainframe chassis as shown in Figure 6 22 1 Orient interface board so that the board components are facing up and the mouse keyboard connectors are to the left RFA300 Measurement Set 8VSB Service Manual 6 35 Maintenance 6 36 2 Align the interface board mounting holes with the chassis studs and place the board onto chassis
45. for Caution The value must be less than High Caution and greater than Low Alarm 6 Enter the high value for Caution The value must be less than High Alarm and greater than Low Caution 7 Enter the high value for Alarm The value must be greater than High Caution RFA300 Measurement Set 8VSB Service Manual Operating Basics For some measurements you cannot enter values for all limits as it would be counterproductive For example there is no reason to set a high caution or alarm value for signal to noise when you want the signal to noise to be as high as possible Masks The mask testing feature is not on when you receive your instrument To turn masks on and off and to select different masks do the following steps 1 Open measurement window For example open the Amplitude and Phase Error window 2 Click the Setup button located in the toolbar 3 Select the appropriate box to enable a mask test The mask is enabled when checked 4 Select the mask you want to use 5 Click OK to accept your changes and return to your measurement window Not all of the measurements need and do not include a mask test Those that do not are the Signal Noise Error Vector Magnitude and Pilot Amplitude Error window and Peak Average and Channel Spectrum window You can create a mask for those measurements that include mask testing Refer to Mask file formatting in the online help Viewing Results Once you open a measurement wi
46. in the online help 6 Select when to be notified under Notification Criteria if a caution alarm or error occurs You can also select not to be notified 7 Ifyou selected to be notified in step 6 select the notification action NOTE Before you can set up Email notification you must install a Messaging Application Program Interface MAPI compliant Email application 8 Click on the Email Settings button to change Email parameters NOTE Selecting Send Email opens the Email dialog box if the destination is not yet specified You can enter the address include a message and send the current results or only results that have violated limits 9 Click Suspend Actions and select how often you want to be notified Click OK to close 10 In the Setup window click the OK button to apply your selections and to return to the Signal Monitor window RFA300 Measurement Set 8VSB Service Manual Operating Basics Online Help The online help gives detailed information about the operation of the RFA300 measurement set Look in the online help for details about user selections and controls that are not described in this manual To access online help go to the Help menu as shown in Figure 2 8 Click for Topic help File Edi View Setup Run Stop Tools Window Help ame c smoothing fot an ovs Click for What s This help on selected object Figure 2 8 Help menu Help Topics Help topics t
47. installed in a standard mainframe platform The mainframe processor has the capability to make the calculations and data transfers required to do the signal measurements The mainframe circuitry also provides the power and user interface connections to the installed modules The measurement set modules accept the radio frequency input on a selected TV channel from 7 to 69 down converts it and digitizes the signal for demodulation and analysis Mainframe Operation The functional operation is divided between the mainframe and the measurement set modules The functional description starts with the mainframe and its capabilities A simplified block diagram of the mainframe is shown in Figure 3 1 The System Bus is contained in a backplane circuit board The bus directly connects to all applications modules shown in the block diagram Full system bus connections to the application modules are provided Power and control signal connections are provided for all the plug in modules and other modules installed in the mainframe lower compartment System Busses System Bus contains three sub busses plus other signal wires M Power Sub Bus This sub bus carries power and ground to the applications modules m Control Sub Bus The control bus is a PCI bus m Communications Sub Bus The communications sub bus provides the intermodule connections M Audio Bus This bus provides a way to route an audio signal generated on any Applica tion Module to th
48. interface connectors on the rear and side of the measurement set shown in Figure 2 2 and Figure 2 3 provide interconnection ports for peripheral devices and networking Table 1 5 and Table 1 6 in Specifications list the pin assign ments for the rear panel and side panel connectors RFA300 Measurement Set 8VSB Service Manual 2 3 Getting Started Printer Power RS 232 RS485 LAN ALARM RS 232 SVGA RF COM Port2 Connection Universal Serial Bus USB Figure 2 2 RFA300 measurement set rear view 2 4 RFA300 Measurement Set 8VSB Service Manual Getting Started Keyboard and Monitor Connect the keyboard and monitor to the left hand side of the instrument as Connections shown in Figure 2 3
49. setup a list of Windows components You can now continue the installation 22 Set the Date and Time properties as appropriate 23 Click Cancel in the Add Printer Wizard dialog box if a printer is not connected otherwise click Next to install the printer driver 24 Click the OK button when Windows 95 asks to restart the computer Configuring Power configure the power management of the instrument do the following steps Management 1 Open My Computer Control Panel and double click Power 2 Clear the check box to Allow Windows to manage power use 3 Click OK to close the Power Properties dialog box and restart the computer Cirrus Logic Display This procedure adds the driver for the display To add the driver do the Driver following steps 1 Insert the CD ROM labeled RFA300 Measurement Set 8VSB Application Software into the CD ROM drive Open My Computer Control Panel and double click Display Select the Settings tab Click the button labeled Advanced Properties Select the Adapter tab then click the Change button Click the Have Disk button a PF YS Type the path to the files as D DRIVER Cirrus Disk1 in the Install From Disk dialog box 8 Click the OK button After the disk is scanned you will see a display of the available devices 9 Select the device named Cirrus Logic 755X PCI 1 30 10 Click OK to begin loading the driver 11 Click OK to close the Insert Disk dialog box 12 When asked f
50. shown in Figure 3 2 The down converter module is a shielded RF assembly in the mainframe lower compartment The down converter attenuates and down converts the input signal from the TV transmitter to a 10 MHz to 16 MHz IF intermediate frequency There are two paths through the down converter A wide band channel is used for all modes that demodulate the 8VSB signal A narrow band channel is used when measuring spectrum content over a band of 2 channels on either side of the input TV channel The narrow band channel provides greater dynamic range than the acquisition module A D converter Software control during the sweep makes up for this dynamic range difference and gives full hardware dynamic range to the spectral measurement The 8VSB transmissions from the TV transmitter include a low amplitude sample of the real axis carrier signal This sample called the pilot is used to RFA300 Measurement Set 8VSB Service Manual Theory of Operation acquire the carrier Certain signal processing simplifications are possible if the 8VSB signal is down converted to place the pilot frequency at the symbol frequency 10 762 MHz Also the 8VSB signal must be sampled at a multiple of the pilot IF In the RFA300 measurement set a multiple of four is used Therefore the acquisition A D converter is clocked at 43 048 MHz A pilot lock system tunes the pilot of the IF signal to 10 76 MHz The frequency The pilot signal is tuned by varying the f
51. state of FracN Latch Lock and FracN RT Lock 8 If either FracN Latch Lock or FracN RT Lock is not checked C688 needs to be adjusted 5 4 RFA300 Measurement Set 8VSB Service Manual Adjustment Procedure LO Frequenc lt LE x LU Board LO Functions Hw Init ivi LO ADC 3723 E Divide EN 27 23e LO Freq MHz 200 000 i i Band Divider fi 0x Enable BandDiv S ynth Flash Hi Freq Ose LO Signal Detect PEDES Band Divider Disable 1 2 Pilot EEPROM Upper Loop BW Hi Vv Freq MHz 400 000 Pilot EEPROM Upper Loop Gain 180 _Update CN 200 JownConverte Driver m FracN Board m Lock Indicators Hw Setti FEET FracN and 537 zd w Setting FPGA ID 136 Coarse Tune 50 LO RT Lock M ear LOLow Filt r fi r J FracN Latch Lock 113 Load FPGA FracNRTLock 7 Load FPGA 10MHz VCXO DAC fi 493 Update j Mfg Tune Src Re Sre Intemal In emal Update Riad Status Debug On Estem C Eternal C Apply Hwlnit ETE Lock Indicators Update button Tune Src FracN ADC readout FracN Update button Coarse Tune LOLow Filter setting Figure 5 1 Hwui window with Synthesizer selected 9 Ifallthe Lock Indicators are checked press the FracN ADC button and note the value NOTE The value for FracN ADC will not be
52. stop and then start the measurement using the Stop Run button in the toolbar to get a new measured amplitude 14 Repeat step 13 until the second generator amplitude is down in the noise floor RFA300 Measurement Set 8VSB Service Manual 4 33 Performance Verification Restore Data Files 4 34 G amp RFA 300 Out of Channel Emissions 16 File Edi View Setup Run Stop Tools Window Help gleja Smoothing Hon 2 iu x Qut of Channel Spectrum Out of Channel Power to Average Power ui ida Lower Channel 67 9 dB Upper Channel 67 9 dB Adiacent Channel Mask Test Pass C 3 Channels C Fast Update 5 Channels Enhanced Accuracy Amplitude Freq Cursors dB MHz 6 49 0 02 61 02 120 A 6750 12 68 Smoothing Current 9 28 98 2 14 48PM Tektronix Figure 4 17 Out of Channel measurement accuracy showing reduced second tone amplitude After the testing and adjustments are finished restore the user setup and the user data files using the following steps E Exit the RFA300 application if it is running 2 Insert the RFA300 Performance Verification and Field Adjust Software disk into the floppy disk drive 3 In the RFA300 PV folder double click on the Restore icon 4 In the RFA300 Mfg Config Setup window Are you sure you want to configure cleanup the instrument for shipment Click Yes 5 Important In the Mfg C
53. that attach the handle to the chassis see Figure 6 1 RFA300 Application Modules Removing the Acquisition 6 12 Module A The RFA300 measurement set plug in modules are located in the mainframe card cage The down converter module is located in the mainframe bottom compart ment in a separate and shielded chassis subassembly The following procedures start after removal of the cabinet from the mainframe NOTE There are many cables and connectors to disconnect and reconnect to remove and replace RFA300 modules Make note of the cables you disconnect and the routing of the cables as you remove a module to assist you in making the correct connections when you reinstall the replacement module 1 Remove the holding screws from the top and bottom of the acquisition module 2 Carefully pull up on the module to loosen it from the back plane module connectors You may have to alternate lifting on the front and the rear of the module to work it loose from the from the connectors and the card cage 3 When the module is loose from the connector lift the module up to gain access to the interconnections cables CAUTION Use care when disconnecting the RF interconnection cables from the circuit board connectors Do not force the connector from side to side the board connector may break RFA300 Measurement Set 8VSB Service Manual Maintenance J 4 to J 1 of the Down Converter module
54. the Home Window you can access all measurements by clicking on the appropriate icon A measurement begins to run immediately as soon as the window opens Figure 2 6 shows the Home Window Refer to the Reference chapter in the RFA300 Measurement Set SVSB User Manual for an overview of each measurement window 8VSB Measurement Set Home File Edit View Setup Fun 1 Tools Window Help S S Setup Smoothing Off z Pashto Aun za Fwd fA lt Frequency Response Amplitude Error Out of Channel Peak Average Group Delay Phase Error Channel Spectrum Signal Noise Signal Monitor Error Vector Magnitude Pilot Amplitude Error For Help press F1 Figure 2 6 Home Window Menu selections are available from any measurement window and the Signal Monitor window Refer to the RFA300 measurement set online help for a description of each menu selection All toolbar selections are available from any measurement window and the Signal Monitor window The toolbar provides an easy method for accessing frequently used functions Figure 2 7 shows the toolbar followed by a list of the functions RFA300 Measurement Set 8VSB Service Manual Operating Basics Recall Smoothing Run Stop Whats Results Print Selection Button Back amp Forward This File Edit Setup Run Stop Tools Window Help 29 8 E Smoothing Of T Save E dit Run Home Results Setup Status lt lt Back Figure 2 7 Toolbar T
55. the Hwui window click the Down Converter soft key In the Down Converter window set the Input Atten to 0 dB Select the Synthesizer menu shown previously in Figure 4 11 on page 4 25 Set LO Frequency MHz to 400 000 Press the LO Freq MHz button Push Tune Src for Internal Verify that Ref Src is Internal Press Update in the FracN board box and Lock Indicators box Verify that all four lock indicators are checked Measure the 400 000 MHz signal using the spectrum analyzer Note The signal amplitude is low usually about 50 dBm Check the counter measurement for the following condition Frequency is greater than 399 997 500 Hz and less than 400 002 500 Hz If the counter measurement is not within the frequency limits given above do the 10 MHz VCXO Frequency Adjustment procedure starting on page 5 9 in the Adjustment Procedure section RFA300 Measurement Set 8VSB Service Manual Performance Verification 86 1 MHz VCXO 1 Set the center frequency of the spectrum analyzer to 430 489 510 Hz Frequency Check D Select Hw Setting in the HWUI window 3 Scroll down the list of LO LOW band data to find the LO LOW band number and the DAC value associated with 21 52 MHz Use 21 53 MHz if the frequency steps are odd Example LO LOW band is typically 5 the DAC value may be around 100 4 Push Cancel 5 Select Synthesizer in the HWUI window 6 Set LOLow Filter to the band associated with 21 52 MHz Example LOL
56. the drive on a static free work area 1 Wear a static grounding wrist strap when handling a disk drive 3 To p mounting Ne z S a a d Hard drive connector Figure 6 14 Bracket screw locations for hard disk drive 2 With bracket top mounting tab facing away from hard drive as shown in Figure 6 14 place hard drive against bracket 3 Align hard drive mounting holes with bracket holes 4 Attach hard drive to bracket with four crosstip screws Torque each screw to 2 in lbs 5 Plug the ribbon cable long end onto the hard drive connector as shown in Figure 6 15 RFA300 Measurement Set 8VSB Service Manual Maintenance Do NOT use the four end pins Figure 6 15 Hard drive ribbon cable orientation NOTE The orientation of the ribbon cable red colored band is shown in Figure 6 15 RFA300 Measurement Set 8VSB Service Manual 6 27 Maintenance Hard Drive Assembly Use the following steps to reinstall the hard drive assembly Replacement 7 TU HD Connector ontroller board partial E Chassis slot for hard drive bracket Figure 6 16 HD installation with controller cable connectors 1 Install the hard drive assembly onto the mainframe chassis as shown in Figure 6 16
57. the instrument The following procedures set up the default screen appearance for the RFA300 measurement set It is recommended that you enter the defaults as listed This ensures the optimal screen visibility and usability for the touch screen feature Menu Text To enter the default font size complete the following steps 1 Right click on background Select Properties Click on the Appearance tab Click on the word normal for menu display Change Font Size to 10 A wv Rm Click OK Color To set the color palette complete the following steps 1 Right click on the background Select Properties Click on the Settings tab Change Color Palette to High Color 16 bit Click OK A wu RO m Select Apply settings without restarting and click OK at the Compatibility Warning dialog box RFA300 Measurement Set 8VSB Service Manual Maintenance 7 8 Click OK on the Display Properties dialog box Click Yes to accept the settings Task Bar To set the properties for the task bar complete the following steps 1 2 3 4 Right click on the Taskbar Select Properties Select Auto Hide and Always On Top Leave Show Clock selected Click OK Startup Folder To set the properties for the Startup Folder complete the following steps 1 Sog pon FF BN Right click on the task bar Select Properties Select the Start Menu Programs tab Click the Add button Browse to C jsrc bin rfa exe
58. you will need to use these cartons the spacer pads the protective bag and the instrument support inserts to provide adequate protection NOTE The RFA300 Measurement Set 8VSB shipping carton in good condition must be used to return the instrument to Tektronix service centers We cannot honor the warranties if the measurement set is not shipped in its original carton or in a replacement carton and its supporting packaging material purchased from Tektronix Contact your Tektronix representative to obtain new packaging Obtaining Replacement New packaging material is available from Tektronix The part numbers are in Packaging Table 6 3 and in the Replaceable Mechanical Parts List in the service manual Packaging components are shown in Figure 6 26 Each component has an index number which also appears in Table 6 3 To obtain these items contact your nearest Tektronix office or representative Table 6 3 Packaging material Item Tektronix part number Index number Accessory tray 004 4851 00 Accessory tray 004 4852 00 Spacer pad makes two pads for 004 4925 00 inner shipping box Protective bag 006 8164 00 Top tray cardboard insert 004 4912 00 1 Instrument support inserts top and 004 4913 00 2 bottom Inner shipping box 004 4926 00 3 Shipping box 004 4914 00 4 RFA300 Measurement Set 8VSB Service Manual 6 55 Maintenance Repackaging Instructions When the RFA300 is shipped it is important to provide it
59. 0 controller 1 44 MByte High density double sided 2HD Standard PC compatible Enhanced Integrated Device Electronics EIDE HDD connecting to the Front Panel Interface Board 2 1 GByte replaced by 3 2 GByte drive ATA Enhanced IDE EIDE RFA300 Measurement Set 8VSB Service Manual 1 9 Specifications Table 1 3 Processor system characteristics Cont Description PC compatible half height IDE CD ROM drive connecting to the Front Panel Interface Board IDE ATAPI gt 8X Characteristic CD ROM Interface Speed Table 1 4 Display system characteristics Characteristic Description System Classification Standard PC graphics accelerator technology bitBLT based residing on the Peripheral Component Interconnect P CI bus capable of supporting both an internal color LCD display and an external color SVGA XGA monitor as well as support multimedia graphics MPEG 1 compression and YCrCb Video Cirrus Logic CL GD7555 GUl Accelerated XGA SVGA controller chip utilized Display Memory DRAM based frame buffer memory Installed 2 MByte Width 32 bit Style Fixed SMT not socketed Speed 70 ns dual CAS DRAM Display Selection Hardware sense of external SVGA monitor during BIOS boot sequence defaults to the internal color LCD display or if attached to an external SVGA monitor Dual display Simulscan of the external SVGA monitor with the internal color LCD is possible as long as internal and ex
60. 00 Measurement Set 8VSB Service Manual Replaceable Parts Manufacturers cross index cont Mfr code OKAW4 0KB01 0KB05 OLOL7 0LUA3 02284 12136 211733 3M099 46628 50356 52152 61058 61162 6Y440 74594 7X318 80009 93907 TK1869 TK1935 TK1943 TK2250 TK2376 TK2411 TK2383 TK2480 Manufacturer SEAGATE PERIPHERALS INC STAUFFER SUPPLY CO NORTH STAR NAMEPLATE INC RADISYS CORPORATION PHILIPS COMPONENTS INSIGHT ELECTRONICS PHC INDUSTRIES INC BELDEN WIRE amp CABLE COMPANY PORTLAND SCREW COMPANY LOGITECH INC TEAC AMERICA INC 3M COMPANY MATSUSHITA ELECTRIC CORP OF AMERICA JFW INDUSTRIES INC MICRON SEMICONDUCTOR PRODUCTS INC COMPONENT RESOURCES INC KASO PLASTICS INC TEKTRONIX INC CAMCAR DIV OF TEXTRON INC ALPS ACCRA FAB INC NEILSEN MANUFACTURING INC ARROW ELECTRONICS INC CONDUCTIVE RUBBER TECH TEKTRONIX HONG KONG PANASONIC INDUSTRIAL CO WILLAMETTE PLASTIC Address 3081 ZANKER ROAD 810 SE SHERMAN 5750 NE MOORE COURT 5445 NE DAWSON CREEK DRIVE 100 PROVIDENCE PIKE 12002 115TH AVE NE 1643 HADDON AVE PO BOX 1448 2200 US HWY 27 SOUTH PO BOX 1980 6520 N BASIN AVE 6505 KAISER DR 7133 TELEGRAPH RD PO BOX 750 INDUSTRIAL TAPE DIVISION 3M CENTER PANASONIC INDUSTRIAL CO DIV TWO PANASONIC WAY 5134 COMMERCE SQUARE DRIVE 8000 S FEDERAL WAY PO BOX 6 BUSSMAN PARTS C O CASEY LAKEY 14525 SW WALKER ROAD 5720 C NE 121ST AVE STE 110 14150 SW K
61. 1 2 3 4 or 5 years Country Instrument model and serial number Phone Instrument purchase date Table of Contents General Safety Summary 0000 cece cee enne Service Safety Summary 2 e lw Eg pe PR ERE wee ws bene pated Preface 2 4 ade Me Sele E HEN E E REA Related Manual s gt Dae bbb IDCM RUE bes Manual Conventions Pot eod DOR soie oe UR HER CR b eee ews Betore You Bes soe teuer ecu Ss ec Rub E om HR D Service State Oy Tektronix Service Offerings CREUSE CER Red Warnanty Repair Setvi6e leuc Ge p REESE HER ERU Rt SeryiCe UMORE Re EIU Self SET REMPLI Contacting a trei Rp ER ect RS Eaa Specifications Specification Fables oer ee cene Yd ave or she Performance Conditions 0 ees RFA300 Measurement Set Specifications Measurement Specifications Platform Characteristics eser rer meer ile denter a e ER eA Power Characteristics 1 5 eerte er E ener aee dec dore eO Environmental Characteristics e Electromagnetic Compatibility een Mechanical Physical Characteristics Standard ACCOSSOFIE
62. 15 screw Use a long shafted screwdriver to access the front screw through the hole in the chassis b Atthe top of the power supply remove two short T15 screws c Atthe rear of the power supply remove two short screws and two long T15 screws Figure 6 18 Power supply long and short screw locations 4 Disconnect the backplane ribbon cable from the power supply module connector 5 Disconnect the front panel ribbon cable from the front of the power supply module 6 30 RFA300 Measurement Set 8VSB Service Manual Maintenance 6 Slide the power supply module out of the chassis Use a flat blade screw driver as necessary to disconnect the power supply connectors from the backplane connectors Reinstall the Power Supply Use the following steps to reinstall the power supply module 1 Align the power supply connectors with backplane connectors as shown in Figure 6 18 2 Press power supply module onto backplane connectors main chassis 3 Attach the power supply module to the chassis with five short and two long T15 screws Torque the screws to 8 in lbs a Atthe front of the power supply module attach the power supply to the chassis with one short T15 screw b Attach the top of the power supply to the chassis with two short T15 screws NOTE The long T15 screws are used for attaching the power supply to the chassis at either side of the line fi
63. 18 and Reinstall the Controller Board on page 6 34 Reinstall the power supply assembly using its reinstallation instructions refer to Power Supply Removal and Replacement on page 6 29 Reinstall the cover and bezel to complete the assembly refer to Removing the Front Panel Bezel and Removing the RFA300 Cabinet on page 6 9 RFA300 Measurement Set 8VSB Service Manual Maintenance Power supply connectors NN c TA LN N y 0 D 0 A 9 b os ga S NS oo y ENN NV S WN E N S V 7 wey Q 4 w W M Figure 6 24 Backplane orientation and screw locations 6 39 RFA300 Measurement Set 8VSB Service Manual Maintenance Software Installation 6 40 There may be occasions when you have to reinstall software after replacing the hard disk or restore software that has been deleted or corrupted The procedures in this section explain how to reinstall all software onto the hard disk NOTE If you are reinstalling after replacing the hard disk you should perform all of the procedures in this section in sequence The process of installing software on an RFA300 hard disk consists of the following major steps Preparing the hard disk m Installing Windows 95 on the hard disk m
64. 300 Measurement Set 8VSB Service Manual Adjustment Procedure 7 8 Use the arrow keys to adjust the Coarse DAC and the Fine DAC to set the frequency to the value closest to 430 489 510 Hz Note After setting the two DAC voltages to adjust the frequency the oscillators may have up to 200 Hz of drift within a few minutes You do not have to check this drift Push NvSave to save the new DAC values Push Cancel this does not cancel the saved DAC values When the Done dialog box appears push OK This completes the adjustment procedure for the oscillators Disconnect the test equipment Calibrate the Touch Screen Do the touch screen calibration if the touch screen fails the in the performance verification procedure Refer to Touch Screen Test on page 4 9 1 a A PF YS With the mouse point to and click on the Start icon The Start icon is located in the bottom left corner of the display With the mouse point to and select Programs Select TOUCH SCREEN UTILITIES Select CONFIGURATION Select INTERFACE Select RESET Follow reset instructions Use the mouse cursor to point to OK and and select it with a click of the mouse button Select CALIBRATION Select CALIBRATE Follow calibration instructions using fine tipped object that has a soft non scratching point 10 Click on the OK box using the mouse 11 Select EXIT Restore Data Files After the testing and adjustments are finished r
65. 4 RFA300 Measurement Set 8VSB Service Manual Theory of Operation Input Attenuation The input attenuator reduces the input signal amplitude to the appropriate level for the input mixer of the down converter Two stages of signal attenuation are used A fixed 5 watt 10 dB or 20 dB attenuator at the input terminal attenuates the normally high amplitude signal obtained from the transmitter sample output that can be in the range of 1 watt or more NOTE A modification to the RFA300 changed the 20 dB input attenuator to a 10 dB attenuator to permit measurements on lower amplitude signals Modified products are supplied with an external 10 dB attenuator to permit the full specified input amplitude to be applied After the input attenuator a selector switch selects between the external input or the internal input The unused input is terminated The second attenuator stage is a variable attenuator that adjusts the amplitude of the selected signal to the appropriate level for direct application to the input mixer stage Input Mixer The input mixer combines the input TV signal and the local oscillator LO signal to produce the intermediate frequency IF of 10 MHz to 16 MHz There is only one stage of conversion and no preselection circuitry A single direct conversion mixer stage introduces less linear distortion than a multiple conversion receiver z Down Converter Module
66. 5 01 211 0910 00 343 1636 00 343 1627 00 211 0895 00 671 4126 01 119 5695 00 Serial no effective B010100 B010150 Serial no discont d B010149 B010199 Qty Name amp description KNOB BEZEL PC ABS 9X 17 X 1 50 MARKER IDENT LABEL POWER BUTTON 2 000 X 0 735 LENS LIGHT CLEAR ACRYLIC LIGHT PIPE 1 729 X 0 140 KEYCAP POWER 0 2X0 4X1 326 POLYCARBONATE DISPLAY ASSY DISK DRIVE WINCHESTER 2 5 IN 1 4GB 0 5 INCH 12MS IDE ST91420AG DISK DRIVE WINCHESTER 2 5IN 2 1GB 9 5 MM IDE MHF2021AT DISK DRIVE WINCHESTER 2 5IN 3 2GB 9 5 MM 13MS SEEK TIME IDE 4200 RPM MOBILE MHF2032AT DISK DRIVE PROGRAMMED RFA300 WINCHESTER 2 5 IN 3 2GB 12 5 MM HIGH IDE MHD2032AT BRACKET HARD DRIVE MTG 0 050THK AL ALLOY 5052 H32 SCREW MACHINE M3 X 0 5 X 4MM PNH STL ZI PLT PHL CLAMP COVER FLT CABLE ROUTING CLAMP 343 1627 00 BASE CABLE CLAMP 0 5H X 2 98L 0 625 W NYLON 6 6 ADHESIVE COVER 343 1636 00 SCREW MACH M2 6 X 0 45 X 8MM PHILLIPS PNH ZINC YELLOW CIRCUIT BD ASSY INTERFACE PCB 679 4126 01 TESTED 389 2408 00 WIRED FAN DC TUBEAXIAL 12 V 3 24W 2300 RPM 83 CFM 119MM X 38MM 35 DBA W 2 PIN CONNECTOR RFA300 Measurement Set 8VSB Service Manual Mfr code TK1935 0KB05 7X318 7X318 80009 OKAW4 04956 04956 80009 TK1943 74594 06915 06915 OKBO1 80009 TK1943 Mfr part number 200 4384 01 334 9582 00 352 1068 00 366
67. 8 Table 2 1 Operating requirements 2 2 Table 2 2 Front panel key controls 2 10 Table 2 3 Control key combination functions 2 11 Table 2 4 Toolbar functions 2 13 Table 4 1 Required equipment list ee eee 4 2 Table 4 2 Keypad test 4 18 Table 5 1 Required equipment list eee 5 1 Table 6 1 Static susceptibility 6 1 Table 6 2 Troubleshooting 6 7 Table 6 3 Packaging material 6 55 Table 7 1 Power cord options 7 1 RFA300 Measurement Set 8VSB Service Manual EEUU AGENS General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures To Avoid Fire or Use Proper Power Cord Use only the power cord specified for this product and Personal Injury certified for the country of use Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the p
68. ABLE ASSY SP SPEAKER CPD 30 26AWG 10 0 L 1X2 0 1 CTR RCPT FEMALE LATCHING PLZ MTE AMP 103961 CA ASSY SP ELEC HIGH DENSITY FLOPPY DRIVE ZIF 26 0 039 CTR TIN PLATED END FOR ZIF LINE CONNECTOR CA ASSY SP ELEC HIGH DENSITY FLOPPY DRIVE ZIF 26 0 039 CTR TIN PLATED END FOR ZIF LINE CONNECTOR CA ASSY SP DISCRETE CPD 8 11 0 L 2X X12 FEMALE 0 165CTR STR MINI FIT JR X 1X 8 FEM CA ASSY SP ELEC HIGH DENSITY PROCESSOR HDI 100 18 0 L CONN RCPT BOTH ENDS FEMALE STR 1 X 100 0 CA ASSY SP ELEC RIBBON IDC 4 26 30 AWG 15 0 L FEMALE STR 2 X 2 0 079 CTR 2MM BERG 69307 004 CA ASSY SP ELEC RIBBON FRT PNL POWER IDC 30 28AWG PVC 3 FOLDS 2 25 L 8 5 L 5 5L 2 5L RCPT F CA ASSY SP ELEC RIBBON DISPLAY ADAPTOR BOARD FLX 50 28AWG 6 5 L RCPT 2 X 50 FEMALE STR 0 079 CABLE ASSY SP RIBBON IDC 14 28 AWG 1 125 L 3M 33665 14 CABLE 2 X 14 FEMALE RTANG 0 100 CT CA ASSY RF COAX RFD 1 50 OHM RD 316 7 4 L MMCX PLUG STR X MMCX J ACK STR CA ASSY RF RFD 1 RG174 50 OHM 6 00 L MMCX STR TO MMCX STR CA ASSY SP ELEC RIBBON EIDE DRIVE FLX 44 RCPT FEMALE RTANG 2 X 22 0 079 CTR 2MM 30 GOLD BO CA ASSY IDE TO HARDDRIVE FROM PIO 2MM 2 X 22 2 0 INCHES RFA300 Measurement Set 8VSB Service Manual Mfr code 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 060
69. ARD IEC 1 CABINET WRAPARO WITH HANDLE AND MTG FEET 0 050 ALUMINUM SAFETY CONTROLLED STANDARD ACCESSORIES 1 POINTER ASSY MOUSE 400 DPI MOUSE LOGITECH SAD35 6MD 1 KEYBOARD 104 WINDOWS RT5156TW 1 ATTENUATOR FXD 10DB N FEMALE TO N MALE PROVIDED WITH INSTRUMENTS WITH THE 10 DB INTERNAL ATTENUATOR 1 SOFTWARE PKG CD ROM RFA300 APPLICATION 1 SOFTWARE PKG QUALITY ASSURANCE ADVANCED DIAGNOSTICS QA PLUS VER 7 01 WHEN INSTALLED VER 71 1 SOFTWARE PKG MICROSOFT WINDOWS 95 OEM VER 4 00 950B ORSII 2 CD ROM MANUAL amp 3 5 INCH DISK 1 SOFTWARE PKG WIN95 STARTUP BOOT DISK RFA SERIES 1 MANUAL TECH USER W CD ROM 063 3053 00 RFA300 MEASUREMENT SET 8VSB OPTIONAL ACCESSORIES POUCH PLASTIC PLASTIC POUCH TLA704 CA ASSY PWR 3 18 AWG 98 L 250V 10AMP 98 INCH RTANG IEC320 RCPT X STR NEMA 15 5P W CORD GRIP CA ASSY PWR 3 1 0MM SQ 250V 10A 2 5 METER RTANG IEC 320 RCPT EUROPEAN RACKMOUNT KIT W 075 0372 00 INSTRUCTION SHEET COMMON PLATFORM MANUAL TECH SERVICE RFA300 MEASUREMENT SET 8VSB RFA300 Measurement Set 8VSB Service Manual Mfr code TK2480 80009 93907 12136 OKBO1 TK1943 46628 0D1M6 61162 TK2548 60128 60128 80009 TK2548 TK2582 53109 TK1373 80009 TK2548 Mfr part number 200 4408 00 348 1154 01 ORDER BY DESCRIPTION PT 3170 212 0213 00 390 1176 00 SAD35 6MD 122761 001 50 FP 010 H6N 063 3053 01 QA PLUS WI
70. ARL BRAUN DR PO BOX 500 ATTN ALICIA SANFORD 516 18TH AVE 100 CNTRE AVE 11007 NE 37TH CIRCLE 3501 PORTLAND RD NE 9500 SW NIMBUS AVE BLDG E 22125 17TH AVE SE SUITE 117 8 F MAPPIN HOUSE 98 TEXACO RD 1600 MCCANDLESS DR 1111 NW 5TH PLACE RFA300 Measurement Set 8VSB Service Manual City state zip code SAN J OSE CA 95134 2128 PORTLAND OR 97214 4657 HILLSBORO OR 97124 6474 HILLSBORO OR 97124 SLATERSVILLE RI 02876 KIRKLAND WA 98034 CAMDEN NJ 08103 RICHMOND IN 47374 PORTLAND OR 97217 FREMONT CA 94555 MONTEBELLO CA 90640 6537 ST PAUL MN 55144 1000 SECAUCUS NJ 07094 INDIANAP OLIS IN 46237 9738 BOISE ID 83707 0006 BEAVERTON OR 97006 VANCOUVER WA 98682 BEAVERTON OR 97077 0001 ROCKFORD IL 611045181 ROCKVILLE CENTRE NY 11570 VANCOUVER WA 98682 SALEM OR 97303 BEAVERTON OR 97008 7163 BOTHELL WA 98021 TSUEN WAN N T HONG KONG CN MILPITAS CA 95035 CANBY OR 97013 10 3 Replaceable Parts Replaceable parts list Fig amp index Tektronix part Serial no Serial no Mfr number number effective discontd Qty Name amp description code Mfr part number 10 1 1 343 1604 00 1 RETAINER CIRCUIT BOARD 0 050 AL TK1943 343 1604 00 2 211 0408 00 8 SCR ASSEM WSHR 4 40 X 0 250 PNH STL ZINC T 10 OKB0l 211 0408 00 TORX DR SEMS 3 156 7816 00 2 IC MEMORY CMOS DRAM 4M X 32 DRAM 16MEG DRAM 6Y440 MT8LDT432HG 6X MT8LDT432HG 6X DIMM 72 PART ON CON
71. C or 1 8 F per 1 000 ft or 305 m above 5 000 ft or 1524 m altitude 0 C to 50 C 32 F to 122 F 30 C 54 F hr max gradient non condensing derated 1 C per 1 000 ft or 305 m above 5 000 ft or 1 524 m altitude With a floppy diskette media in the floppy drive the operating specification lower limitis 10 C 50 F 20 C to 60 4 F to 140 F 30 C 54 F hr max gradient non condensing 20 to 80 relative humidity non condensing Max wet bulb temperature 31 C or 87 8 F derates relative humidity to 50 at 50 C or 122 8 to 80 relative humidity non condensing Max wet bulb temperature 40 C or 104 F derates relative humidity to 55 at 50 C or 122 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 8 Environmental characteristics Cont Description Characteristic Altitude Operating Up to 10 000 ft 3 040m derated 1 C or 1 8 F per 1 000 ft 305 m above 5 000 ft 1524 m altitude 40 000 ft 12 190 m Non Operating Table 1 9 Dynamics Characteristic Description Random Vibration Operating 0 27 grus total from 5 Hz to 500 Hz 10 minutes each axis 3 axes 30 minutes total 2 28 Orus total from 5 Hz to 500 Hz 10 minutes each axis 3 axes 30 minutes total Half sine 30 g s 11ms duration 3 drops each side 18 shocks total no media in floppy disk drive Non Operating Functional Shock Operating Tabl
72. CD Drive Mouse and Keyboard Ports supply The LCD display connects to the front panel interface board through a display adapter board in the display assembly The touch panel is a standard 10 4 inch panel mounted over the surface of the flat panel display The touch panel is active at the same time as the mouse A second front panel processor combines the mouse and touch screen signals to generate and receive standard mouse scan codes from the system controller The hard disk drive is a standard 2 5 inch IDE drive that interfaces directly to the system controller through an EIDE Enhanced Integrated Device Electronics extension of the PCI bus The floppy disk drive is a standard one half inch drive that supports 3 5 inch 1 44 Mbyte high density double sided floppy disks The CD drive is a half height drive similar to standard lap top computers A CD caddy is not needed Open and close the CD drive drawer manually to insert and or remove a CD from the drive Plug in a PS2 compliant mouse and keyboard to the ports at the lower left side as you face it of the bezel These port are interfaced through the front panel processors to the mainframe controller RFA300 Measurement Set Functional Description 3 4 Simplified Block Description The RFA300 measurement set application consists of three plug in modules and one bolted in module in a mainframe platform A simplified block diagram of the modules and the signal interconnection is
73. D9 060D9 060D9 060D9 060D9 060D9 060D9 060D9 Mfr part number 174 3785 00 174 3886 00 174 3899 00 174 3873 00 174 3872 00 174 3865 00 174 3864 00 174 3795 00 174 3786 00 174 3786 01 174 3875 00 174 3784 00 174 3814 00 174 3789 00 174 3787 00 174 3887 00 174 3967 00 174 3863 00 174 3788 00 174 4228 01 10 9 Replaceable Parts A XE ege 3 Figure 10 3 Cables RFA300 Measurement Set 8VSB Service Manual 10 10 Replaceable Parts Replaceable parts list Fig amp index Tektronix part number number 10 4 1 200 4408 00 2 348 1154 01 3 211 0738 00 4 367 0477 00 5 212 0213 00 6 161 0230 01 7 390 1176 00 119 4330 02 119 5662 00 119 6328 00 063 3053 01 063 2506 00 063 2776 00 063 3185 00 071 0198 03 016 1441 00 161 0104 00 161 0104 06 016 1691 01 071 0199 01 Serial no effective B0101094 B0101094 B0101094 Serial no discont d Qty Name amp description 1 COVER PROTECTIVE 0 125 ABS BLACK HAIRCELL TEXTURED GSE W ADHESIVE FOAM 4 FOOT CABINET POLYCARBONATE LEXAN940 EARTH BROWN 4 SCREW MACHINE 6 32 X 0 625 PNH STL BLK ZI TORX 1 HANDLE CARRYING DUAL DUROMETER MOLDED HANDLE POLYPROPYLENE HANDLE VINYL GRIP SECTION 2 SCREW MACHINE 8 32 X 0 75 L PNH STL BLACK OXIDE PL TORX 1 CABLE POWER STAND
74. E STEPS ARE VERY IMPORTANT If any of the steps above are not correct ALL THE STEPS BELOW WILL DE TUNE LO LOW 9 Press the Update button in the Lock Indicators box a Verify that LO Latch Lock and LO RT Lock are checked b Note the state of FracN Latch Lock and FracN RT Lock 10 If either FracN Latch Lock or FracN RT Lock is not checked the resonator needs adjustment refer the Adjustment Procedure section 11 If all the Lock Indicators are checked press the FracN ADC button and note the value see the Note below NOTE The value for FracN ADC will not be correct until the FracN ADC button is pushed 12 If the FracN ADC volts is between 0 80 V and 0 80 V the resonator does not need adjustment If the voltage is outside the limits given above do the LOLow Resonator Adjustment and the LOLow Calibration procedures starting on page 5 5 in the Adjustment Procedure section RFA300 Measurement Set 8VSB Service Manual Performance Verification 13 Exit the hwui exe program LO Frequency z HwUi BE E Board LO Functions Hw Init ivi LO ADC 3723 Divide byN 20 X Loane LO Freq MHz 200 000 Band Divider hn sz Enable BandDiv Synth Flash Hi Freq Ose LO Signal Detect e Band Divider Disable 1 d ge Pilot EEPROM Upper Loop BW Hi RW FIN Freq MHz 400 000 Pilot EEPROM Upper Loop
75. Gain 180 _Update FrN CN 200 JownConverte s Driver r FracN Board m Lock Indicators Hw Setti Loop Gain 27 a mu LO Latch Lock 7 He Seting FPGA ID 136 LO RT Lock Update FracN B T 50 oarse Tune p LOLow Fit E Spur DAC Tbl FracN Latch Lock SEU DAL l L FracN RT Lock M FPGA 10MHz VCXO 1493 Update Cab Mfa Re Src In amal Update Flead Status Debug On US Bebug n T Apply Hwlnit EXPE Lock Indicators Update button Tune Src FracN ADC readout FracN Update button Coarse Tune LOLow Filter setting Figure 4 11 Hwui screen with Synthsizer selected Fractional N Synthesizer Check Preparation for Testing For the Fractional N synthesizer the 10 MHz VCXO frequency and the 86 1 MHz VCXO are checked to determine if they need adjustment Prepare to make the oscillator checks using the following procedure 1 Connect RF input connector of the RFA300 measurement set to the spectrum analyzer 2 Setup the spectrum analyzer as follows a Center frequency to 400 MHz b Span to 50 kHz RFA300 Measurement Set 8VSB Service Manual 4 25 Performance Verification 10 MHz VCXO Frequency Check 4 26 D R9 9 Y om c Resolution BW to 500 Hz d Reference level to 30 dBm e Video BW to 500 Hz f Turnon the frequency counter Exit the RFA300 measurement application if it is running Run the program hwui exe In
76. KTOP RFA300 PV olx File Edit View Help aleae xal fe lE 58 55 L1 d Hwui Knobtest Restore Touch Screen Configuration 5 object s 2 23KB 6 Start the RFA300 measurement set application NOTE The toolbar Setup button is not the same as the Setup menu item 7 Adjust the 8VSB reference signal frequency to 686 31 MHz the channel 50 pilot frequency NOTE If you are using a frequency other than channel 50 refer to Selecting channel frequency in the online help for other channel pilot frequencies 8 Press the Setup button on the toolbar and select the System tab 9 In the Instrument Tuning box set the frequency to 686 31 MHz or other channel frequency Click the Apply button 10 Click on the Verify Signal Input Power button 11 Check that the Input Signal Power thermometer display is green with the level in the OK range 12 Click the Close button Click OK to close the Instrument Setup menu 13 Go to the Tek Only selection in the toolbar Click on Normalization Calibra tion 14 Press the Run button if necessary to start the Normalization A line appears in each of the graph displays a few seconds later The shape of the line changes as normalization takes place When the Stop button changes back to Run normalization is finished 15 Check that the Calibration Status is PASS 16 Disconnect the 8VSB reference signal from the measurement set RFA300 Measure
77. Manual Specifications Measurement Specifications Table 1 2 Measurement specifications Characteristic Description S N Signal to noise ratio S N is the ratio of ideal signal power to all other signal contributions noise distortion products etc Data is taken only from the I channel that is the real axis in phase with the pilot at each symbol time S N 20 log Where S N Signal to Noise Power Ratio in dB I Ideal received I channel signal ol Error in the actual received I channel signal S N Accuracy Reading is within 1 dB of the correct value When S N 25 dB with high smoothing Residual S N z 40 dB The amount of S N that is created within the instrument 14 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 2 Measurement specifications Cont Characteristic EVM Error vector magnitude EVM Accuracy Residual EVM Description EVM is the square root of the mean of the squares RMS of the magnitudes of the real axis symbol error vectors divided by the magnitude of the real in phase part of the outermost ideal constellation state The symbol error is the difference between the received real axis symbol and ideal its ideal value EVM is often expressed as a percent Error Vector Magnitude EVM is defined by the following formula EVM ays x 100 Where EVMpms Error Vector Magnitude Slj The error in the real axis received signal val
78. N OEM VER 7 01 000 39801 063 3185 00 071 0198 03 TK1441 BLACK CORDURA ORDER BY DESCRIPTION ORDER BY DESCRIPTION 016 1691 01 071 0199 01 10 11 Replaceable Parts Figure 10 4 Cabinet parts and accessories 10 12 RFA300 Measurement Set 8VSB Service Manual
79. NOTE Hard drive bracket inserts into chassis slot as identified in 6 16 Note the orientation of the pin 1 indicator on the ribbon cable 2 Attach the hard drive assembly to the chassis with two T15 screws Torque the screws to 8 in Ibs 3 Plug the hard drive ribbon cable onto controller board HD connector 6 28 RFA300 Measurement Set 8VSB Service Manual Maintenance 4 Reroute and reconnect any other ribbon cables that were disconnected to remove the hard drive assembly 5 Attach the top of the cable clamp on the hard drive mounting bracket Speaker Replacement 1 Route the speaker wire harness through mainframe chassis hole as shown in Figure 6 17 2 Attach speaker to chassis with four T15 screws Torque the screws to 8 in Ibs Fans with wire harness Figure 6 17 Speaker installation and fan locations Power Supply Removal Use the following steps to remove the power supply module and Replacement 1 Turn off and disconnect the main power from the RFA300 measurement set 2 Remove the measurement set cabinet refer to Removing the Cabinet on page 6 9 for the removal instructions RFA300 Measurement Set 8VSB Service Manual 6 29 Maintenance 3 Remove the five short and two long T15 screws that attach the power supply module to the chassis see Figure 6 18 for the screw locations a Atthe front of the power supply module remove one short T
80. On Stby button as many times as required to check the lights RFA300 Measurement Set 8VSB Service Manual 4 5 Performance Verification 4 6 NOTE The On Stby button has to be pressed before Windows 95 begins to load Possible error messages may appear if the measurement set is turned off during loading of Windows 95 program 6 While the measurement set is loading Windows 95 check that the two green colored LED STBY and HDD located at the lower left corner of the front panel are operating 7 Wait about 30 seconds for the Enter Network Password window to appear on the LCD display Note that the RFA300 measurement set can be configured to bypass the network password window and the start up continues as in step 9 8 With the mouse point to and select Cancel Figure 4 3 Front panel keypad showing highlighted buttons in gray 9 Listen for a short tune Sounds played by the measurement set speaker 10 Wait for the instrument to complete the power on self tests and start Windows RFA300 Measurement Set 8VSB Service Manual Performance Verification Functional Verification Procedure NOTE The RFA300 measurement set can be configured to start up the RFA300 application at power on In that case you will not have to start the application The functional verification consists of confirming the basic operation of the RFA300 measurement set The power on di
81. Procedure 4 Scroll through the hardware settings until LO LOW Band data appears see Figure 5 3 5 LO LOW Band 0 should have no calibration data It is unused until the instrument senses the need for more range 6 LO LOW Band 1 should start at 20 000 MHz 50 If this is not true C688 is not properly adjusted 7 Check the amount of overlap at each band transition Overlap is the difference between the highest frequency in one band and the lowest frequency in the next band There should be greater than 40 kHz of overlap between each band Typical overlap is in the range of 150 to 250 kHz For example if the highest frequency in band 1 is 20 400 MHz the lowest frequency in band 2 must be less than 20 360 MHz The maximum frequency in one band must be a little higher than the minimum frequency of the next highest band 8 Select Cancel to close the Hardware Settings window and then exit the Hwui window Hardware Settings External Input Enable 1 NarrowB and Enable 0 NarrowB and Pad Enable 0 NarrowB and Atten 15 5 zi LO LOW Band 0 LO LOW Band 1 20 000 MHz 50 20 020 MHz 54 20 040 MHz 59 20 060 MHz 64 20 080 MHz 69 20 100 MHz 75 20 120 MHz 81 20 140 MHz 87 20 160 MHz 94 20 180 MHz 101 20 200 MHz 103 4 Figure 5 3 Hardware Settings window in Hwui screen RFA300 Measurement Set 8VSB Service Manual 5 7 Adjustment Procedure Fractional N Synthesizer Adjustment Preparation for Adjus
82. RFA300 Measurement Set 8VSB circuit boards Use the RFA300 module block diagram to aid in identi fying the interaction between modules when troubleshooting Use the exploded view diagrams in the Replaceable Parts List of Section 10 to locate the modules installed in the RFA300 Measurement Set 8VSB Use the interconnection block diagram to determine cable connections when removing or replacing modules NOTE If you remove a module made a note of the cable routing within the measurement set to aid in reinstalling the module and any interconnection cables that you remove RFA300 Measurement Set 8VSB Service Manual 9 1 Diagrams 9 2 RFA300 Measurement Set 8VSB Service Manual Acquisition Module RF Input 4 50 OhmExternal Precision N 1510 17 10 7 MHz 2 W 33 dBmMax Nanow BW 0 5 cB steps vei select X T gt 2 27 Full scale 10or bets ome V
83. S hee PES ud aee gru d eod Roe cR a Optional ACCeSSOTIeS ct m cb Pee QURE d sedet FER Ro a Operating Information Started 5 ceto eror ER TU EU e EE Installation 255 8s dee Phd RSS REP Gus oka FRENOS eps eS Hardware Installation RES E Operating Requirements 0 eE eee eee ene RF Connections oe Rede RIED NY Interface Connectors 2 hoes bg REIP SEHR S CREE Keyboard and Monitor Connections Powenng On and Off BOERS SEES Ree ped First Time Power sorier tina eed oer IR RENNES Powenng off 5S 9m P E wh Operating Basits 4 2 re ERR ERE KE Saha Front Panel rekes SPESE a ES e de KEYS sies deeper ete sur eb eter PRSE S THMPXSI SAEPE TOUCH CES zs josie a sop REX repr Re ROSSI ESSEN MSS Home WIndOW x eei a uit mer Sen tide Pace ore Re Hee eee ss Pom MSS ud zu e crotch eM ge pus Making a Measurement RFA300 Measurement Set 8VSB Service Manual xiii xiv xiv XV XV XV xvi xvi xvi xvi xvii 1 19 2 1 2 1 2 1 2 2 2 2 2 3 2 5 2 6 2 6 2 7 2 9 2 9 2 10 2 11 2 12 2 12 2 12 2 13 Table of Contents Theory of Operation Performance Verification Selecting Channel Frequency Sipe da Rl edet hebr dcs 2 13 B
84. Service Manual Tektronix RFA300 Measurement Set 8VSB 071 0199 01 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shippi
85. TROLLER CIRCUIT BD 4 407 4652 00 1 BRACKET ANGLE LEFT SST 3066 TK0191 407 4652 00 5 407 4571 00 1 BRACKET 0 044 THK PCI BOARD PILOT LOCK 1010 1020 1943 407 4571 00 CRS ZI PLT 6 407 4526 00 2 BRACKET 0 044 CRS ZINC PLATE 3 760 X 0 850 TK1943 407 4526 00 7 211 0722 00 80 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 0 01 ORDER BY TORX DRIVE DESCRIPTION 8 119 5832 00 1 LINE FILTER GEN PURPOSE 6A 50 60 HZ 115 260 VAC OADN8 06GENG3E IEC CONNECTOR 06GENG3E SNAP IN 9 650 3760 00 1 PWR SUPPLY ASSY 80009 650 3760 00 10 039 0041 00 B010171 1 CONTROLLER PICMG PCI SINGLE BOARD COMPUTER 00007 PFS 070 WITH PENTIUM PROCESSOR PFS 070 039 0041 01 B010172 1 CONTROLLER PICMG PCI SINGLE BOARD COMPUTER 00007 PFS 070 WITH PENTIUM PROCESSOR PFS 070 11 672 1505 00 1 CIRCUIT BD ASSY DIGITIZER 039 0000 00 80009 672 1505 00 12 672 1507 00 1 CIRCUIT BD ASSY MODULE PILOT 80009 672 1507 00 13 672 0397 50 1 CIRCUIT BD ASSY SYNTHESIZER MODULE 672 0397 00 80009 672 0397 50 TESTED 10 4 RFA300 Measurement Set 8VSB Service Manual Replaceable Parts Figure 10 1 Replaceable PCI modules 10 5 RFA300 Measurement Set 8VSB Service Manual Replaceable Parts Replaceable parts list Fig amp index Tektronix part number number 10 2 1 211 0722 00 2 671 4123 00 3 131 0890 01 4 211 0721 00 5 343 0775 00 6 671 4544 00 7 650 3829 00 650 4061 00 8 211 0840 00 9
86. a password d Proceed with step 3 RFA300 Measurement Set 8VSB Service Manual Getting Started 3 Follow the instructions on the screen and enter the Windows 95 Product Identification number located above the bar code on the Windows 95 software package that came with your instrument Enter other information as required The internal setup software automatically configures your instrument and installs all required devices After the setup software completes configura tion the RFA300 measurement set application will start The next time you power on the application starts automatically You do not need to perform step 3 Powering Off Always power off the instrument using the Windows 95 shutdown process and then press the On Standby switch NOTE At least once a month power down and restart the instrument The measurement set performs an internal calibration as part of the power on procedure This ensures the optimum measurement accuracy of the instrument RFA300 Measurement Set 8VSB Service Manual 2 7 Getting Started 2 8 RFA300 Measurement Set 8VSB Service Manual Operating Basics This section describes the basic operation of the RFA300 Measurement Set 8VSB For operating details refer to the online help The RFA300 measurement set is built into a mainframe called the platform that uses Microsoft Windows 95 as its operating system The RFA300 Measurement Set 8VSB makes measurements that ar
87. able 2 4 Toolbar functions Toolbar selection Function Recall Results Recalls a previously saved measurement Save Results Saves the results ofthe current measurement Print Prints one copy ofthe current measurement Edit Setup Provides setup controls for the instrument and measurements Smoothing S election Selects the degree for reducing the variations of the waveform and results Smoothing is accomplished differently for each type of measurement Refer to the online help for each measurement window to determine how smoothing is accomplished Run Status Run Stop Button Back and Forward Home Shows when the measurement is running or stopped red is stopped and green is running Begins or stops performing measurements Back opens the previously opened window Forward opens the following window Returns to the Home Window What s This Making a Measurement Selecting Channel Frequency Provides a brief description ofthe selected control or object The following provides a basic overview of how to make and save a measure ment Refer to the online help for details on other operating features of the RFA300 measurement set An explanation of how help works is on page 2 17 Before running measurements you must select your channel frequency and determine that the input signal has sufficient power to the RFA300 measurement set Without sufficient power at the test signal input the instrument cannot RFA300 Measurement Se
88. agnostic tests are done during the power on process These tests check the basic functionality of the measurement set If a failure is detected the Power on diagnostics dialog box opens with the failed test indicated 1 Start the RFA300 measurement set application if it does not start automati cally The Calibration window is displayed and a progress indicator shows the calibration and diagnostic progress 2 Ifthe power on diagnostics fail or the RFA300 measurement set fails to boot up correctly refer the problem to a qualified service person Extended Diagnostics Run the extended diagnostics to test functionality in more detail Use the following steps to run the extended diagnostics 1 Goto the Tools menu and select Diagnostics Click the Extended Diagnostics tab Use the mouse to select All Modules and Test Select One Time and click Run Check that all the tests pass wa PF amp Click on Close to exit the Diagnostics dialog box If a failure does occur contact Tektronix using the information provided in the Introduction of this manual or click on Support located under the Help menu NOTE The tests in this procedure can be performed on any television channel in the range of 174 MHz to 806 MHz channel 7 to channel 69 If you have no preferred channel the Normalization and testing should be done on channel 50 pilot frequency is 686 31 MHz to assure the best operation of the range of channels RFA300 Measurem
89. ame Mechanism Description Up Arrow Button Navigate and change focus from one window Button function to another Right Arrow Button Down Arrow Button Select Button Same as mouse button one Adjust Knob Rotary encoder Multi function control increment decrement field values or screen element size or position Run Stop Button with 3 color Starts or stops a measurement LED LED indicates whether product is in Run pause or stop state Esc Button Standard Escape key Tab Button Standard Tab key Print Button Prints the current measurement using the same print settings as for the previous print Touch Button Toggles Touch Screen state on and off LEDs indicate Touch Screen On Off state Menu Application key Button Same as mouse button two Help Button Opens the Help contents standard F1 key Print Screen Button Copies the screen to the clipboard Alt plus Print Screen copies the active window START Key Button Opens the Windows Start menu Numbers 0 9 Buttons Standard number keys most have second od and minus Shift and third Function functions Fctn Button with LED Modifier for numeral keys to create keys F1 through F 12 sticky key feature Del Button Deletes selected text or object gs Button Backspace key RFA300 Measurement Set 8VSB Service Manual Operating Basics Table 2 2 Front panel key controls Cont Control name Description Button Enter key Ct
90. ard disk From the command prompt type C WIN95 SETUP to setup Windows 95 Press ENTER to continue Click Continue from the Windows 95 Setup dialog box Click Yes in the Software License Agreement dialog box Click Next in the Window 95 Setup Wizard dialog box Choose C WINDOWS for the Windows 95 directory Click Next to continue Select Typical in Setup Options and click Next to continue Enter the Certificate of Authenticity number from the Windows 95 user manual and click Next to continue Enter User Information and click Next to continue Select Network Adapter and Sound MIDI or Video Capture Card in the Analyzing Your Computer dialog box and click Next to continue Select Install the most common components recommended in the Windows Components dialog box and click Next to continue Select Yes I want a startup disk recommended in the Startup Disk dialog box and click Next to continue Click Next in the Start Copying Files dialog box Insert a blank disk in the floppy drive to create a Windows Startup Disk when asked Click Finish in the Finishing Setup dialog box You might receive an error message that states An internal stack overflow has caused this session to be halted Change the STACKS setting in your CONFIG SYS file and then try again RFA300 Measurement Set 8VSB Service Manual Maintenance To comply turn the power off and back on again When Windows 95 starts up it will go through and
91. asurement Set 8VSB Service Manual Getting Started Installation Hardware Installation AN AN The Getting Started section of this chapter provides basic information about using and installing the RFA300 Measurement Set 8VSB There is information about the physical instrument and introductory information about how to operate it The Operating Basics section that follows provides a conceptual overview of how the RFA300 measurement set works Read this section before attempting any installation procedures This section describes site considerations power requirements and ground connections for your instrument This section deals with hardware installation The instrument is designed to operate on a bench on a cart or in a rackmount cradle in the normal position on the bottom feet For proper cooling at least two inches 5 1 cm of clearance is recommended on the rear and sides of the mainframe CAUTION For rack mounting the product must be installed in its specified rack cradle as listed in the Optional Accessories list in Specification For proper cooling the air temperature at all air intake vents inside of the rack must not exceed 50 C You can also operate the instrument while it rests on the rear feet If you operate the instrument in that position make sure that you properly route any cables coming out of the rear of the instrument to avoid damaging them Before you can operate the product you must connect th
92. c Drive compact disc CD drive requires routine maintenance to operate at maximum efficiency Compact discs can be damaged if dirt and dust accumulate on the surface To prevent damage a CD should be properly stored in its protective container when not in use CAUTION Electrostatic discharge ESD can damage components in the CD ROM drive do not touch lens or exposed metallic parts on the platter Clean the face of the CD drive monthly with a dampened cloth the internal components may be damaged CAUTION Do not allow moisture to enter the disk drive When power is applied Keyboard The keyboard may require occasional cleaning to remove lint or oil buildup Use the following procedure to clean the keyboard 1 If the product is operating stop any running applications and shut down the operating system 2 Turn off the power to the mainframe 3 Unplug the keyboard from the mainframe 4 Clean all lint and loose debris from the keyboard with either clean dry low velocity air or with a clean soft brush 5 Clean the external surfaces with a soft cloth dampened with a solution of mild detergent and water Do not allow solution to run into the keyboard RFA300 Measurement Set 8VSB Service Manual 6 3 Maintenance 6 4 Mouse A Interior CAUTION If liquids such as coffee or soft drinks have gotten into the keyboard intermittent operation can occur If this has happened consider replacing th
93. cations Platform Characteristics Table 1 3 Processor system characteristics Characteristic CPU Processor Type Main Memory Available Configurations Style Speed Burst Read page hit miss Installed Configuration Cache Memory Description Intel P5 200 MMX processor with an Intel 82430HX Triton 1 PCI chip set EDO DRAM resides on the host processor bus via the 82430HX chipset Standard 32 MByte Enhanced 128 MByte 16M amp 64M SODIMM 60ns 4 2 2 2 10 2 2 2 32 MByte must be installed in 16 MByte pairs Level 2 L2 Write back cache resides on the host processor bus via the 82430HX chipset Capacity 256 KByte Style Fixed SMT not socketed Speed data tag 8 5 10ns Burst Read Cycle 3 1 1 1 Burst Writes Cycle 3 1 1 1 Flash BIOS Provides PC Plug and Play services with and without Windows 95 NT PnP OS Flash based BIOS field upgradable via a floppy disk Forced recovery capable via floppy Capacity 1 MByte Style Fixed SMT not socketed Real Time Clock and CMOS Setups NVRAM Retention Time RTC CMOS Setup amp PnP NVRAM Floppy Disk Drive Size Technology EIDE Hard Disk Drive Formatted Capacity Interface Real time clock calendar with a resolution of 1 second or less Standard and advanced PC CMOS setups see BIOS specifications Battery life is typically gt 7 years Standard 3 5 PC compatible High Density Floppy Disk Drive FDD connecting to the ISA bus via a Super 1
94. ces listed under Other Devices Restart the instrument When Windows starts up it will find the new device and ask to install the driver for PCI Card This is the RFA300 acquisition card Click the Next button to continue Windows will not be able to find the driver Click the Other Locations button and browse to C jsrc bin acqbrd Click OK Click OK to continue Windows will find the driver for device Signatec PnP Device Click Finish to continue Click OK to close the Insert Disk dialog box When asked for the Signatec Driver Disk browse to C jsrc bin acqbrd and select sigdrv vxd Press OK to accept the file Press OK to end the dialog box Windows will find another new device and ask to install the driver for PCI Card This is the RFA300 synthesizer card Click the Next button to continue RFA300 Measurement Set 8VSB Service Manual 6 51 Maintenance 6 52 RFA 300 Appearance 13 Windows will not be able to find the driver Click the Other Locations button and browse to C jsrc bin synthbrd Click OK to end the browse 14 Click OK to continue Windows will find the driver for the device Tektronix Synthesizer 15 Click Finish to continue 16 Click OK to close the Insert Disk dialog box 17 When asked for the Tektronix Driver Disk browse to C windows sys tem vmm32 and select windrvr vxd 18 Press OK to accept the file 19 Press OK to end the dialog box 20 Select Yes at the prompt to restart
95. cessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product AK CAUTION WARNING Protective Ground Referto Manual High Voltage Earth Terminal RFA300 Measurement Set 8VSB Service Manual uuu La Service Safety Summary Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock switch off the instrument power and then disconnect the power cord from the mains power Use Care When Servicing With Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections RFA300 Measurement Set 8VSB Service Manual xi Service Safety Summary xii RFA300 Measurement Set 8VSB Service Manual Preface This manual contains the servicing information for the RFA300 Measurement Set 8VSB This instrument is composed of the RFA300 measurement set hardware and application software installed in a mainframe platform
96. circuits 400 V 1000 V Low Power Schottky TTL 900 V TTL 1200 V RFA300 Measurement Set 8VSB Service Manual 6 1 Maintenance Observe the following precautions to avoid damaging static sensitive devices 1 Minimize handling of static sensitive components 2 Transport and store static sensitive components or assemblies in their original containers on a metal rail or on conductive foam Label any package that contains static sensitive components or assemblies 3 Discharge the static voltage from your body by wearing a wrist grounding strap when handling static sensitive components Service assemblies containing static sensitive components at static free work stations 4 Remove any device capable of generating or holding a static charge from the work station surface 5 Whenever possible keep the component leads shorted together 6 Pick up components by the body never by the leads 7 Do not slide components over any surface 8 Avoid handling components in areas where the floor or work surface covering is capable of generating a static charge 9 Use a soldering iron that is connected to earth ground 10 Use only special antistatic suction or wick type desoldering tools Preventive Maintenance 6 2 Exterior of Instrument Once a year the electrical performance should be checked and the instrument accuracy certified calibrated Preventive maintenance mainly consists of periodic cleaning Periodic cleaning
97. cks the A D converter m Acquisition Module SS Full Scale lVpp RAM 512 kB __ Address Decoder PCI Transceivers Platform Bus Figure 3 5 Acquisition module block diagram The 512 kB RAM stores the digitized signal until it is accessed by the system controller for processing Communication of the data and addressing of the RAM is handled through the PCI interface RFA300 Measurement Set 8VSB Service Manual Theory of Operation Synthesizer The synthesizer module provides the Local Oscillator LO frequency to the down converter block diagram of the synthesizer module is shown in Figure 3 6 Local Oscillators The synthesizer module has two high frequency local oscilla tors that are combined to provide LO signals that tune over an octave range from 400 MHz to 829 MHz The LO signal is used either directly or counted down by factors of 2 to derive the correct LO frequency from 164 MHz to 829 MHz for the TV channel from Ch 7 to Ch 69 to be down converted Two phase lock loop circuits control the frequency of the local oscillators pee 3 0 10 1050 Synthesizer Module
98. correct until the FracN ADC button is pushed 10 If the FracN ADC voltage reading is between 0 80 V and 0 80 V then C688 does not need to be adjusted If the voltage is outside the given range do the LOLow Resonator Adjust and the LOLow Calibration procedures LO Low Resonator Adjustment The LO Low Resonator adjustment C688 is adjusted by inserting a screwdriver through the hole in the shield on the rear panel 1 Ifeither FracN Latch Lock or FracN RT Lock is not checked adjust C688 while repeatedly pressing the Lock Indicator Update until both of these lock indicators are checked RFA300 Measurement Set 8VSB Service Manual 5 5 Adjustment Procedure 2 When all lock indicators are checked observe FracN ADC update it by pushing the FracN ADC button 3 Adjust C688 so that the FracN ADC voltage is between 0 30 V and 0 30 V FracN ADC must be continuously pushed in order to display new values LO Low Calibration Calibrate the LO Low bands using the following procedure 1 In HWUI Select Calib and push the LO Low Calib button see Figure 5 2 This step may take a few minutes if LO LOW is being calibrated for the first time 2 After the calibration is finished a dialog box that says Calibration Success appears Select OK LO LOW Calib button Figure 5 2 Partial Hwui window with Calib selected 3 Press the Hw Setting button 5 6 RFA300 Measurement Set 8VSB Service Manual Adjustment
99. ct button 5 In the Shut Down Windows window that appears move the cursor to the Yes box and click the mouse select button 6 Wait for the following screen to appear It s now safe to turn off your computer 7 Set the measurement set On Stby switch to Stby 4 36 RFA300 Measurement Set 8VSB Service Manual 7 Adjustment Procedure This section provides the recommended field adjustments for the RFA300 Measurement Set 8VSB Testing software containing some special testing applications is used for the Performance Verification steps before any adjust ments are made The software saves the user setup files and user data files for restoration after the testing is done As a final step the software removes the testing software from the RFA300 measurement set to prevent its inadvertent use in normal operation of the product The software is provided on a floppy disk as an accessory to this service manual Equipment Required Table 5 1 lists the test equipment needed to perform the adjustment procedure The table identifies examples and provides the minimum tolerances where applicable If other test equipment is substituted it must meet or exceed the tolerances listed Table 5 1 Required equipment list Test equipment Characteristic Example Spectrum analyzer Frequency accuracy better Rohde amp Schwarz FSEB20 30 than 10 Hz at 400 MHz Spectrum Analyzer 50 coaxial cable Connectors N type male Tektronix part numbe
100. ctor JH Tracking generator output Spectrum analyzer input SWR Bridge 50 coaxial cables Figure 4 12 Return loss test setup 2 Setthe spectrum analyzer as follows m Center frequency 500 MHz Span 800 MHz 80 MHz per div m Resolution Bandwidth 20 kHz m Video Bandwidth 1 kHz m Ref Level 0 0 dBm 3 Set the tracking generator as follows m Output 0 dBm m Frequency offset None m Modulation None m Tracking generator On 4 Single sweep the tracking generator The trace indicates the open circuit reflected power Note its lowest point in dBm RFA300 Measurement Set 8VSB Service Manual Performance Verification 5 Connect the SWR bridge to the RF input of the RFA300 measurement set using a precision N type barrel connector for the shortest possible connection from the SWR bridge to the RF input connector 6 Single sweep the tracking generator again This time the trace indicates the reflected power from the input circuit of the RFA300 riding on the noise floor as shown in Figure 4 13 Open circuit reference line Return loss Input circuit reflected power Figure 4 13 Return loss calculation 7 Check that the return loss is greater than 25 dB for all frequencies between 174 MHz and 806 MHz The return loss is the difference between the Open Circuit and Input Circuit reflected traces see Figure 4 13 8 Disc
101. cuitry has enough range to handle up to 1 W at the input connector With external 10 dB attenuator or 10 mW to 2 W 10 dBm to 33 dBm with internal 20 dB attenuator IF Filter For all measurements requiring demodulation the 8VSB signal is passed through a DSB based vestigial sideband IF filter with the characteristics given in the formula shown in Figure 1 1 The formula also defines the idealized frequency response curve of the transmitter Adjacent Channels lt 50 dB Analog lt 50 dB Digital This specification is the allowable signal amplitude of TV signals other than the one the RFA300 is to measure It is defined as the ratio of the desired signal s average power divided by the sync tip power of analog TV or average power of DTV signals Other Spurious Signals lt 50 dB 1 2 RFA300 Measurement Set 8VSB Service Manual Specifications F Symbio 0 4 F F Fy Fy l pilot Symbol E Symbol 2 1 sin 2 Fuse gt WM lt F lt Fog Tu F ym bol F ym O ut lt 50 2 H F F Symbo FF 1 97 F symbol a F symbol a 2 beat or F symbo dra 1 2 lt F lt 2 1 1 49 lt lt Where Fomor 22 5 10 10 762 238 MHz 0 30Hz i 715 Perform all calculations using the nominal value ga i 9189997 F imta Figure 1 1 IF filter characteristics RFA300 Measurement Set 8VSB Service
102. ding on the measurement being made RFA300 Measurement Set 8VSB Service Manual 3 7 Theory of Operation 3 8 Acquisition IF from down converter O 16 A D 2 Interface K RAM ja fa E Clock from Pilot Lock C 8 IN pp E Signal Demodulation Path Amplifiers in the signal demodulation path amplify and adjust the signal to the correct level for application to the acquisition module A filter circuit eliminates the spectral content of a signal sample well removed from the pilot signal for application to the pilot lock module Narrow Band Filter Path Circuitry in the narrow band filter path amplifies and filters the signal to a 30 kHz bandwidth When making out of channel emission measurements the 15 dB gain step attenuator makes it possible to do the wide dynamic range narrow band measurements within the limited dynamic range of the A D converter Attenuators adjust the path gain both before and after the filter to optimize the signal amplitude for the A D converter in the acquisi tion module The acquisition module contains the A D converter and local acquisition RAM The illustration in Figure 3 5 is a simplified block diagram of the acquisition module The input to the module presents a nominal 50 Q input to the IF signal from the down converter A capacitor couples the 1 Vp p full scale IF signal to the input of the A D converter A 1 Vp p acquisition clock at 43 05 MHz obtained from the pilot lock module clo
103. dule Frac N board cable connections 6 15 Figure 6 6 Synthesizer module connector locations 6 16 Figure 6 7 Connector locations on the down converter module 6 17 Figure 6 8 Flat panel display removal 6 19 Figure 6 9 Key pad assembly 1 6 20 Figure 6 10 Front panel interface circuit board connectors 6 21 Figure 6 11 Chassis screw locations for CD drive 6 22 Figure 6 12 Chassis screw locations for the floppy disk drive 6 23 Figure 6 13 Floppy disk drive and CD audio connector installation 6 25 Figure 6 14 Bracket screw locations for hard disk drive 6 26 Figure 6 15 Hard drive ribbon cable orientation 6 27 Figure 6 16 HD installation with controller cable connectors 6 28 Figure 6 17 Speaker installation and fan locations 6 29 Figure 6 18 Power supply large and small screw locations 6 30 Figure 6 19 Memory board installation 6 32 Figure 6 20 Controller board orientation and screw locations 6 33 Figure 6 21 Controller board connectors 6 34 Figure 6 22 Screw locations for the interface circuit board 6 36 Figure 6 23 Cut away view showing wire routing of fan and speaker WALES stre rmi mimm omnei rw WG na RUE a s 6 37 Figure 6 24 Backplane orientation and screw locations 6 39 Figure
104. e keyboard 6 Reconnect the keyboard to the keyboard connector on the left side of the mainframe Occasional cleaning is necessary to remove accumulated lint which hampers smooth ball movement Use the following procedure to clean the inside of the ball cavity If the mouse is damaged replace it 1 Turn off the main power switch 2 Unplug the mouse from the mainframe 3 Turn over the mouse and loosen the ball retaining ring by inserting your fingers into the slots and turn in the direction indicated by the arrows counterclockwise approximately 45 degrees 4 Turn the mouse right side up cupping the bottom of the mouse in your hand and gently tap until the retaining ring and ball drop into your hand 5 Clean all lint and loose debris from the ball cavity with either clean dry low velocity air or with a clean soft brush Next clean any remaining foreign material from the ball cavity with a soft clean cloth Do not use hydrocarbon or chemical based cleaning solutions inside the ball cavity 6 Replace the mouse ball and retaining ring Rotate the retaining ring clockwise opposite direction to the arrows until the ring locks into place 7 Reconnect the mouse to the mouse connector on the left side of the mainframe WARNING To avoid any potential of electrical shock disconnect power before removing the cabinet Examine the interior of the mainframe for dust build up If the interior needs cleaning use low
105. e 1 10 Transportation Description Transportation P ackage material meets recycling criteria as described in Environmental Guidelines for Package Design Tektronix 063 1290 00 and Environmentally Responsible Packaging Handbook Tektronix 063 1302 00 Characteristic Transportation Package Material RFA300 Measurement Set 8VSB Service Manual 1 15 Specifications Electromagnetic Compatibility Table 1 11 Certifications and compliances Category EC Declaration of Conformity EMC Standards or description Meets intent of Directive 89 336 EE C for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official J ournal of the European Union EN 55011 Class A Radiated and Conducted Emissions EN 55011 Class B Conducted Emissions EN 61000 3 2 AC Power Line Harmonic Emissions EN 50082 1 Immunity EN 61000 4 2 Electrostatic Discharge Immunity EN 61000 4 3 RF Electromagnetic Field Immunity 10 V M EN 61000 4 4 Electrical Fast Transient Burst Immunity EN 61000 4 5 Power Line Surge Immunity EN 61000 4 6 RF Conducted Immunity 10 V EN 61000 4 8 Magnetic Field Immunity EN 61000 4 11 Powerline Interruptions AS NZS 2064 1 2 Industrial Scientific and Medical Equipment 1992 FCC Compliance Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Limits EC Declaration of Conformity Low Voltage U S Nationally Recognized Testi
106. e Internal Speaker and the Headphone Jack m Other Signals Other signals include such things as trigger signals supplies for local regulation by application modules and a serial bus for a simple processor interface RFA300 Measurement Set 8VSB Service Manual 3 1 Theory of Operation ee CERE DU m ri do nn iz mdr ee ee RC Mainframe Keypad RS232 module Ethernet USB USB Keyboard computer piena module ouse On Stby S witch CD Speaker Hard Fans drives Display module SS Applications Possible rear panel connectors Power module ECB Applications Possible rear panel connectors Power module Supply Possible coaxial connection between all ECB modules ECB Applications Possible rear panel connectors c System a back plane gt Applications I modules ECB Applications module Possible rear panel connectors indes Possible rear ignal Application panel connectors KO Interface ECB Possible coaxial connection LL p Z e to all ECB modules Acquisition S ource lt gt Full system bus applications module Front rear panel connectors lt gt At least control and power d Figure 3 1 Platform block diagram 3 2 RFA300 Measurement Set 8VSB Service Manual Theory of Operation Power Supply Power Module consi
107. e Notes Backing Up Files Information about Windows features is available through the Windows help system Access Windows help as you would with any Windows application 1 Goto the Windows taskbar and click Start 2 Select Help from the popup menu NOTE To access Windows 95 help using the Touchscreen press the START key on the font panel The online Release Notes contain information about this release of the RFA300 Measurement Set 8VSB application Check the Release Notes for information such as software compatibility and software version differences from last release To access the Release Notes go to the Windows 95 taskbar and click Start or press the front panel START key The Release Notes are at the top of the Start menu You should back up your files on a regular basis Use the Windows Back Up tool to back up files stored on the hard disk The Back Up tool is located in the following path Programs VAccessoriesV System Tools Back Start the tool and determine the files and folders that you want to back up Use the Windows online help for information on using the Back Up tool In particular you should back up your user generated masks setup files and the results database files RFA300 Measurement Set 8VSB Service Manual Theory of Operation The RFA300 Measurement Set 8VSB is a digital television 8VSB signal quality measurement instrument The measurement set system consists of four modules that are
108. e an internal source A chain of dividers with buffered outputs provides various sub multiples of the 86 1 MHz clock In addition the 238 3 MHz output is derived from the 86 1 MHz reference Th 238 3 MHz output connected to the RF in 2 connector supplies the internal down converter input used for calibration RFA300 Measurement Set 8VSB Service Manual 3 11 Theory of Operation 3 12 RFA300 Measurement Set 8VSB Service Manual NNNM _ _ Performance Verification Test Software Test Interval Prerequisites This section contains procedures for verifying that the instrument performs according to the characteristics stated in the Specifications section If the instrument is not able to pass these tests refer to the Maintenance section for troubleshooting procedures NOTE To complete the procedures in this section you need a basic understanding of the Windows 95 operating system and the RFA300 Measurement Set 8VSB application For detailed operating instructions refer to the Windows 95 manuals and the RFA300 Measurement Set 8VSB User Manual Testing software containing some special testing applications is used for the Performance Verification procedure and the Adjustment procedure The software saves the user setup files and user data files for restoration after the testing is done As a final step the software removes the testing software from the RFA300 measurement set to prevent its inadvertent use in
109. e cable facing towards the floppy drive insert cable into floppy drive connector as shown in Figure 6 13 c While supporting the circuit board push the locking latch closed 6 24 RFA300 Measurement Set 8VSB Service Manual Maintenance JN ees Floppy drive cable Audio connector CD Interface Contacts face toward floppy drive board Figure 6 13 Floppy disk drive and CD audio connector installation Removing the Hard The disk drive is installed in the mainframe immediately behind the flat panel Disk Drive display on the left side of the mainframe The mainframe cabinet must be removed to access the disk drive assembly 1 2 Be sure that you are wearing a static grounding wrist strap Shut down the mainframe and unplug the power cord Remove the mainframe cabinet see Removing the RFA300 Cabinet on page 6 9 for the removal procedure Disconnect the top of the cable clamp holding the ribbon cables to the top of the hard disk drive mounting bracket Remove two attaching screws from the hard drive mounting assembly Disconnect ribbon cables as needed to free the hard drive assembly from the mainframe RFA300 Measurement Set 8VSB Service Manual 6 25 Maintenance Install the Hard Drive to 6 26 the Bracket Assembly 7 Lift disk drive assembly straight up out of the mainframe 8 Disconnect power cable and the hard drive interconnection cable 9 Place
110. e list of LO LOW band data to find the LO LOW band number and the DAC value associated with 21 52 MHz Use 21 53 MHz if the frequency steps are odd Example LO LOW band is typically 5 the DAC value may be around 100 4 Push Cancel 5 Inthe Hwui window select Synthesizer 6 Set LOLow Filter to the band associated with 21 52 MHz Example LOLow Filter 5 7 Set Coarse Tune to the value associated with 21 52 MHz Example Coarse Tune 100 Push the Coarse Tune button 8 Set Ref Src to External 9 Push Update in the Lock Indicators box All four lock indicators should be check marked If the FracN lock indicators are not check marked the LOLow Filter or Coarse Tune or both may be wrong 10 Measure the signal frequency with the spectrum analyzer counter The signal amplitude is usually about 50 dBm 11 Check the counter measurement for the following conditions a Ifthe counter measurement is greater than 430 487 000 Hz and less than 430 492 000 Hz the 86 1 MHz VCXO does not need to be adjusted b Ifthe counter measurement is not within the frequency range limits given continue with the 86 1 MHz VCXO adjustment procedure If the 86 1 MHz VCXO Frequency is not within the limits given above use the following procedure to adjust the frequency 1 In the window select MFG 2 Deselect Synthesizer 10 MHz VCXO Calibration if it is highlighted 3 Select Pilot Lock 86 MHz VCXO Calibration 4 Push Start RFA
111. e provided power cord Refer to Figure 2 2 and connect the power cord to the instrument Refer to Table 2 1 for the supply voltage rating and connect the other end of the power cord to the proper source Do not connect to any power source other than one for which the instrument is rated CAUTION Keep the bottom of the instrument clear of obstructions to ensure proper cooling The RFA300 measurement set is limited to situations where a single high ampli tude 8VSB RF signal is available for direct input to the measurement set Refer to RF Connections RFA300 Measurement Set 8VSB Service Manual 2 1 Getting Started Operating Requirements RF Connections Table 2 1 lists the operating requirements for the RFA300 measurement set Refer to Specifications for a complete specification list Table 2 1 Operating requirements Requirement Specification Source voltage 90VACto250VAC RMS 47Hzt063Hz Steady State input current 6 5 Amperes RMS Maximum power consumption 540 Watts Temperature 0 C to 45 C 32 F to 113 F 30 C hr max gradient non condensing derated 1 C or 1 8 F per 1 000 ft or 305 m above 5 000 ft or 1 524 m altitude Humidity 20 to 80 relative humidity non condens ing Max wet bulb temperature 31 C derates relative humidity to 50 50 C or 122 Altitude To 10 000 ft 3 040m derated 1 C or 1 89 F per 1 000 ft 305 m above 5 000 ft 1524 m altitude The
112. e used to determine the quality of a transmitted 8VSB digital television broadcast signal The system consists of the following components m The key system components installed in the mainframe are modules that down convert the broadcast TV channel frequency lock on to the carrier pilot and digitize the incoming analog data m RFA300 Measurement Set 8VSB application software consists of the user interface signal demodulation signal measurement and results presentation Front Panel The front panel controls can be used to operate the RFA300 measurement set without the mouse or keyboard Figure 2 5 shows the front panel Tektronix RFA 300 Measurement Set 8VSB ur Figure 2 5 RFA300 Measurement Set 8VSB front panel RFA300 Measurement Set 8VSB Service Manual 2 9 Operating Basics Keys You can use the front panel keys as an alternative to a keyboard All the keys and key combinations are available from the front panel For key combinations it is not necessary to hold down more than one key at a time For example you can press SHIFT in the hex keypad and then press a QWERTY key to accomplish a Shifttkey combination The same is true for other key combinations such as CTRL and ALT keys Table 2 2 list front panel key controls and describes their use Table 2 2 Front panel key controls Control n
113. easurement set must be in the range of 10 mW to 2 W 10 dBm to 33 dBm for correct operation For modified instruments with a 10 dB input attenuator the signal power can be in the range of 1 mW to 1 W 0 dBm to 30 dBm 2 Connect a mouse and a keyboard to the appropriate connector on the left hand side of the measurement set 3 Turn on the measurement set 4 If you have the performance verification software loaded skip to step 5 If you do not have the performance verification software loaded load it now as follows a Ifthe RFA300 application is running exit the application File Exit b Insert the PVFA diskette into the floppy disk drive c Open My Computer then open 3 Floppy d Double click on the PV icon The RFA300 PV Installation screen is displayed e In the RFA300 PV Adjust Installation window click GO to load the performance verification software f When the RFA300 PV Installation screen goes away press any key to continue g In Tek Only dialog box verify that Enable the Tek Only menu is checked and Enable Use File Mode is not checked Click OK h Close the 31 5 Floppy A and My Computer windows i Remove the diskette from the floppy disk drive RFA300 Measurement Set 8VSB Service Manual Adjustment Procedure 5 Open the RFA300 PV folder on the desktop Shortcut icons to the test programs are assembled in the folder for ease of accessing the test routines amp C WINDOWS DES
114. ector Magnitude and Pilot Amplitude Error and Signal to Noise Ratio tab between Constellation and Eye Diagram 5 Click on the X in the upper right corner of the application window to shut down the RFA300 application Touch Screen Test NOTE Pointing to touching the measurement set LCD display with your finger causes the cursor to move to that location 1 Verify that the touch screen is operating a Pointto and touch various locations on the measurement set display as shown in Figure 4 5 b Verify that the arrow cursor moves to each location touched in approxi mately one second Move the mouse down to the bottom of the screen to get the Start icon or use the Start button in the keypad Select the Windows 95 menu by clicking the Start icon RFA300 Measurement Set 8VSB Service Manual 4 9 Performance Verification d Deselect the Windows 95 menu by touching the top right corner of the display 2 Verify touch screen uniformity The cursor arrow should smoothly follow within 1 8 inch of the touch position a Drag your finger tip diagonally across the touch screen from top right corner of display to bottom left corner b Drag your finger tip vertically across the touch screen from top to bottom c Drag your finger tip horizontally across the touch screen from right to left If this test fails do the Calibrate the Touch Screen procedure starting on page 5 11 in the Adjustment Procedure section Se
115. een If it is below the green level the signal power to the measurement set must be increased You can add the 10 dB external attenuator provided with the 10 dB input attenuator instruments if necessary to reduce the signal power NOTE With the 10 dB internal signal attenuator modification the input power indicator indicates over amplitude power input beginning at 0 2 W 23 dBm The variable attenuator of the input circuitry has enough range to handle up to 1 W at the input connector 6 Close the dialog box and click OK to close the Instrument Setup dialog box RFA300 Measurement Set 8VSB Service Manual Performance Verification Measurement Open each measurement and verify that activity is occurring in each measure Functionality ment For example to check Frequency Response and Group Delay do the following steps 1 From the Home window click on the Frequency Response and Group Delay icon to open the measurement window 2 Verify that a signal is visible in each measurements graphic within a few seconds 3 Verify that the readout area for both measurements is updating 4 Do the same procedure for each measurement Note that you must select some of the measurement graphs using the selection tabs NOTE Several of the measurements take some time to complete m Amplitude Error and Phase Error m Out of Channel Emissions W Peak to Average Ratio and Channel Spectrum select tab Phase Noise Error V
116. ell you how to perform tasks and describe software features and selections shown on the screen There are two types of help topics reference topics and task topics Reference topics describe application features such as the measurement windows Reference topics may also describe concepts Reference topics are available through the Help menu and through Help buttons in dialog boxes From the Help menu click Help Topics and locate the topic using the Contents or Index tab The Index tab can be more helpful to use than the Contents tab As you enter a word into the text field Help searches for and highlights the topic if one can be found If you do not find the topic you want in the index try the Find tab Enter a word or phase and help displays all topics in the online help that contain the entered word or phrase The Help on Window selection in the Help menu provides reference help for the current window Task topics provide procedure information on how to perform specific tasks Task topics are available through the Help menu From the Help menu click Help Topics and locate the topic using the Contents or Index tab What s This Help What s This help provides a short description of the control or screen feature selected First click the What s This button on the toolbar as shown in Figure 2 8 and then click the item of interest RFA300 Measurement Set 8VSB Service Manual 2 17 Operating Basics Windows 95 Online Help Releas
117. ent Set 8VSB Service Manual 4 7 Performance Verification Verify Input Signal Power 4 8 The input signal test selects the channel frequency and verifies that the input signal has sufficient power Without sufficient power the instrument cannot perform accurate measurements Use the following steps to check the input signal functionality 1 Connect the RF input connector of the RFA300 measurement set to the 8VSB transmitter RF sample output connector using a 50 2 coaxial cable with N type connectors on both ends Use the appropriate connector adapter as necessary to connect to the transmitter The signal power applied to the RFA300 measurement set must be more than 1 milliwatt and less than 1 watt for the internal 10 dB attenuator 0 dBm to 30 dBm If you either have an internal 20 dB attenuator or connect the external 10 dB attenuator to the internal 10 dB input attenuator the input power range is greater than 10 milliwatts to less than 2 watts 10 dBm to 33 dBm Transmitter Channel filter Sample output Power input lt 1 W gt 1 mW without 10 dB attenuator lt 2W gt 10 mW with 10 dB attenuator RFA300 Figure 4 4 Transmitter connection 2 Click the Setup button on the toolbar Select the System Tab in the Setup dialog box 3 Enter the channel frequency the pilot frequency of the transmitter 4 Click the Verify Input Signal Power button 5 Verify that the input signal level is in the OK range in the gr
118. er source Check that the instrument receives power when you press the On Standby switch check that fans start and that front panel indicators light Check that power is available at the Instrument failure contact your loca Controls turned down adjust contro power source Tektronix service center s for brightness and contrast Faulty flat panel display module contact your local Tektronix service center Check for CD in CD ROM drive make sure instrument boots from the hard disk drive Possible software failure or corrupted hard disk referto Software Problems on page 6 5 Isolate problem to faulty platform or to faulty module Contact your local Tektronix service center RFA300 Measurement Set 8VSB Service Manual Maintenance Table 6 2 Troubleshooting Cont Symptom Instrument does not recognize accessories such as mouse or keyboard Windows 95 comes up but the RFA300 measurement set application does not Possible causes and recommended action Check that accessories are properly connected or installed Try connecting other standard PC accessories or contact your local Tektronix service center Instrument not set up to start RFA300 measurement set application at power on Start application from the desktop by double clicking on the RFA300 icon Faulty or corrupt software reinstall the RFA300 measurement set application software Windows 95 comes up in Safe mode Exitthe Safe mode and restartthe
119. ert into drive A the QA Plus disk labeled QAplus Win Win OEM Manual Copy the file Qawwusro exe from drive A to the C Win win directory Remove the QAplus disk from drive A To install software for the RFA300 platform complete the following steps O FANS Insert into the CD ROM drive the CD ROM labeled RFA300 Measurement Set 8VSB Application Software Open My Computer Control Panel and double click System Select the Device Manager tab and double click the Computer icon Select the Reserve Resources tab and select the Interrupt request IRQ button Click the Add button and type 11 for the IRQ line It may say the resource you are trying to reserve is currently in use by another device in the system Click OK to continue Click OK to close the Computer Properties dialog box Click OK to close the System Properties dialog box Press the START front panel key and open the Run menu Type D DRIVER Jps Disk1 SETUP EXE and click OK 10 Click Next from the Choose Destination Location dialog box RFA300 Measurement Set 8VSB Service Manual Maintenance 11 12 13 Click Next from Start Copying Files dialog box If asked for the next disk enter the path as D DRIVER Jps Disk2 When the driver is installed select the Yes I want to restart my computer now button and click Finish to restart the instrument RFA300 Base Application RFA300 application software CD you received has two application software Software In
120. es Table 4 1 Required equipment list Test equipment 8VSB Signal Source Minimum requirement Example 10 mW to 2 W 10 dBm to 33 dBm Signal Generator Rohde amp Schwarz SMT03 Signal Generator Frequency range 174 MHz to 806 MHz FM modulation 100 KHz frequency deviation 80 kHz output amplitude 10 dBm to 30 dBm Signal Generator Spectrum Analyzer SWR Bridge N type barrel connector Frequency range 174 MHz to 818 MHz modulation CW output amplitude 0 dBM to 80 dBm 0 to 1 GHz with tracking generator frequency accuracy better than 10Hz FSEB20 30 Spectrum at 400 MHz Analyzer 50 impedance N type connectors Wiltron 60NF50 Connectors N type male to male MMC 8803B barrel adapter SWR 1 06 or better Marconi 2024 Signal Generator Rohde amp Schwarz 50 Q coaxial cable Connectors N type male length 72 Tektronix part number inches 012 0114 00 Precision 50 Q coaxial cable 2 ea 3 way power combiner divider Adapters 3 ea Adapters 2 ea Connectors BNC male length 36 Tektronix part number inches 012 0482 00 Connectors SMA female Tektronix part number 015 0565 00 Connectors SMA male to BNC female Tektronix part number 015 0554 00 Connectors BNC female to N type Tektronix part number male 103 0045 00 RFA300 Measurement Set 8VSB Service Manual Performance Verification Table 4 1 Required equipment list cont Minimum require
121. escription Pollution Degree A measure of the contaminates that could occur in the environment around and within a product Typically the internal environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are rated Pollution Degree 1 No pollution or only dry nonconductive pollution occurs P roducts in this category are generally encapsulated hermetically sealed or located in clean rooms Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the productis out of service Pollution Degree 2 Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are sheltered locations where neither temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Laser Classification Safety Standards Safety Certification Compliance Temperature operating Altitude maximum operating Equipment Type Savety Class Installation Overvoltage Category Pollution Degree This product contains a CD ROM drive which utilizes a Class 1 laser and complies with EN60825 1 94 as well as with the U S FDA regulations The drive is marked with the laser s classification and the date of
122. estore the user setup and the user data files using the following steps 1 Exit the RFA300 application if it is running RFA300 Measurement Set 8VSB Service Manual 5 11 Adjustment Procedure 10 11 12 13 Insert the RFA300 Performance Verification and Field Adjust Software disk into the floppy disk drive In the RFA300 PV folder double click on the Restore icon In the RFA300 Mfg Config Setup window Are you sure you want to configure cleanup the instrument for shipment Click Yes Important In the Mfg Configuration Complete window select No I will restart my computer later and then click FINISH When the Mfg Configuration Complete dialog box disappears from the display window press any key to continue The user files setups masks colors etc that were saved at the beginning of this procedure are now all restored Verify that the RFA300 PV folder is removed from the desktop Remove the RFA300 Performance Verification and Field Adjust Software disk from the floppy disk drive In the Shut Down Window select Restart the Computer and then click Yes Start the RFA300 application if it does not start automatically Verify that RFA300 application starts as it should and that the Tek Only menu item is removed from the RFA300 menu bar Exit the RFA300 application and shut down the computer using the Shut down the computer selection in the Start menu Turn off the power switch This is the end
123. g neatly over the top of the RFA300 to make it as flat as possible and seal with packing tape 5 Place the bagged RFA300 in the inner shipping box The small feet on the bottom of the cabinet go in the square holes in the spacing pad and the larger feet near the front of the RFA300 go in the larger rectangular holes The bezel end of the cabinet fits over the edge of the spacer pad 6 Place the other spacer pad on top of the RFA300 Again place the side with the small square holes against the side of the box The protective front cover on the bezel of the RFA300 is not covered by the top spacer pad 7 Close and tape the inner shipping box 8 Place one of the support inserts in the bottom of the outer shipping box film side up as shown in Figure 6 26 9 Place the sealed inner shipping box in the center of the bottom support insert in the outer shipping box RFA300 Measurement Set 8VSB Service Manual 6 57 Maintenance 6 58 Sy y M S a ISO uem Note The keyboard mouse and manual boxes do not need to be returned with the RFA300 measurement set for servicing Figure 6 26 Repackaging the RFA300 measurement set 10 Put the second support insert over the inner shipping box film side down NOTE If you are using new packing material purchased from Tektronix pre stretch the film in the support inserts by pushing down firmly several times on the top support insert 11 Place the top tray in t
124. gnal s instantaneous phase error as a function of amplitude This error is typically caused by variation of an amplifier s phase because of signal amplitude 5 0 2 x degrees measured error degree Specifications Table 1 2 Measurement specifications Cont Characteristic Phase Noise Phase Noise Marker Accuracy Residual Phase Noise Residual Phase J itter Peak to Average Ratio Description 5 dB x 105 dBc Hz at 20 kHz carrier offset This is the single sideband noise exhibited by the RFA300 local oscillator lt 5 mlliradians RMS integrated over the range from 2 kHz to 300 kHz Marker Accuracy 1 0 r The reference amplitude is total transmitter output power including the pilot signal 10 dBpty F 20 dBpry F 30dBpty F 40 dBpry dBpry is dB as defined by the FCC s measurement method 50 dBp VI Out of channel 60dBpry measurements are referenced to a 500 kHz noise bandwidth J0dBpry 80 dBpry I RFA300 measurement capability is limited to less than the FCC s 90dBpry F specification The specification continues down to 110 dBpry below total carrier output Next lower adjacent channel N 2 In channel N Lower adjacent channel Figure 1 2 8VSB transmitter emissions mask 1 8 Upper adjacent N 1 channel N 1 Next Upper adjacent channel N 2 RFA300 Measurement Set 8VSB Service Manual Specifi
125. h weight must be added to each configuration weight for total system weight for example maximum overall system weight is 48 Ibs 21 8 kg Standard Accessories The following accessories are provided as standard components to the RFA300 Measurement Set 8VSB m RFA300 Measurement Set SVSB User Manual 071 0198 XX m RFA300 Measurement Set 8VSB Application Software on CDROM 063 3053 XX m Windows 95 Software and manual on CD ROM 063 2505 00 m Windows 95 start up disk 063 3185 00 M QA Plus software on floppy disks 063 2506 00 m WIN95 Keyboard 119 5662 00 m Tektronix three button mouse 119 4330 02 m Standard IEC power cord 161 0230 01 m 10 dB Attenuator connectors N to N 119 6328 00 for those instruments that have a 10 dB internal attenuator rather than a 20 dB internal attenuator 1 18 RFA300 Measurement Set 8VSB Service Manual Specifications Front protective cover 200 4408 00 Optional Accessories The following items are optional accessories An optional power cord is provided in lieu of the Standard power cord when the product is ordered with a power cord option Accessory Pouch 161 0230 01 m Standard power cord options m Opt Al Universal Euro 220 V 50 Hz 161 0104 06 m Opt A4 North America 240 V 60 Hz 161 0104 08 m Rackmount kit with instructions 016 2691 01 m RFA300 Measurement Set 8VSB Service Manual 071 0199 XX RFA300 Measurement Set 8VSB Service Manual 1 19 Specifications 1 20 RFA300 Me
126. haracteristic Out of Channel Emissions Measurement Limit Out of Channel Accuracy Upper Lower Channel Power Accuracy Transmitter Frequency Response Error Frequency range Display accuracy Residual Flatness Error Transmitter Group Delay Frequency Range Display Accuracy Description Outof channel emissions are spectral power versus frequency measurements similar to those made by a spectrum analyzer FCC Out of Channel Emissions Standard as referenced to FCC Regulation 47 CFR 13 622 h In the first 500 kHz from the authorized channel edge transmitter emissions must be attenuated no less that 47 dB below the average transmitted power More than 6 MHz from the channel edge emissions must be attenuated no less than 110 dB below the average transmitted power Atany frequency between 0 5 MHz and 6 MHz from the channel edge emissions must be attenuated no less than the value determined by the following formula Attenuation in dB 2 11 5 Af t 3 6 where Af z frequency difference in MHz from the edge of the channel Measurements are made in a 30 kHz bandwidth and are corrected to the 500 kHz reference bandwidth specified by the FCC This process is specifically allowed by the FCC The 8VSB Transmitter Emissions Mask for the measurements is shown in Figure 1 2 No measurements need to be made any closer to the band edge than one half of the resolution bandwidth of the measuring instrument The default mask has been adjusted to this
127. he Device Manager tab 13 Open Communications Port COM3 listed under the Ports COM amp LPT entry 14 In the Port Setting tab change the settings to the following Bits per second 2400 RFA300 Measurement Set 8VSB Service Manual Maintenance 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 m Data bits 8 Parity None W Stop bits 1 m Flowcontrol None Click OK to close the Port Setting dialog box Click OK to close the System Properties dialog box Press the START front panel key From the Start menu select Programs Touch Screen Utilities Configuration Click the Interface button Select the following settings m COM Port COM3 Interrupt TRQ4 m Address 3E8 m Connection UART m Cal Data Host Click OK to save the settings Click Exit to end the Configuration Utilities Restart the instrument Press the START front panel key From the Start menu select Programs Touch Screen Utilities Configuration Click the Interface button Click the Reset button to reset the touch screen Click Start in the Reset Touch Controller dialog box Click the Advanced button Select the following settings Averaging samples 32 m Rejection Level 40 m Settling Time usec 100 RFA300 Measurement Set 8VSB Service Manual 6 45 Maintenance 6 46 Symbios 53C860 SCSI Driver DEC DC21X4 NDIS 4 0 Ethernet Driver 31 32 33 34 35 36 37 Screen Wires
128. he box If you are not shipping accessories with the measurement set close and tape the outer shipping box 12 When shipping the accessories place the two accessory trays in the top tray arrange the accessories in the trays and then close and tape the outer shipping box 13 Attach the appropriate shipping documents needed to ship the measurement set to its destination either to Tektronix for repair or to another location RFA300 Measurement Set 8VSB Service Manual EN aaa Options The power cord options shown in Table 7 1 are available for the RFA300 Measurement Set 8VSB Table 7 1 Power cord options Plug configuration Option number North America Standard 125 V 15A Plug NEMA 5 15P Europe 230V RFA300 Measurement Set 8VSB Service Manual 7 1 Options 7 2 RFA300 Measurement Set 8VSB Service Manual i Ae Replaceable Electrical Parts The replaceable electrical parts are the replaceable plugin modules and the circuit board assemblies Those parts along with the interconnection cables replaceable hardware and the accessories are indexed in the mechanical parts exploded view illustrations The part numbers are listed in the Replaceable Parts list in Section 10 of this manual RFA300 Measurement Set 8VSB Service Manual 8 1 Replaceable Electrical Parts 8 2 RFA300 Measurement Set 8VSB Service Manual NENNEN Diagrams This section provides two block diagrams of the
129. he following steps RFA300 Measurement Set 8VSB Service Manual Maintenance 10 11 12 13 14 15 Insert the CD ROM labeled RFA300 Measurement Set 8VSB Application Software into the CD ROM drive Open My Computer Control Panel and double click System Select Device Manager tab and remove PCI Ethernet Controllers listed under Other Devices Restart the instrument When Windows starts up it will find the new device and ask to install the driver for PCI Ethernet Controller Click the Next button to continue Windows will not be able to find the driver Click the Other Locations button and enter the path as D DRIVER Dec INF Click OK to continue Windows will find the driver for the device Digital Semiconductor 21143 2 based 10 100 Mbps Ethernet Controller Click Finish to continue Click OK at the prompt for computer and workgroup name Enter a computer and workgroup name as appropriate When ask for PCI Netcard Drivers Directory set location to D DRIV ER Dec Click OK to continue When ask for the Windows 95 CD ROM directory set the location to CAWINO5 After the driver is installed restart the instrument During the startup routine and when asked enter a user name and password for Microsoft networking if appropriate or cancel QA Plus Diagnostics To install the QAPlus diagnostic software complete the following steps 1 Insert the QA Plus disk labeled QAplus Win Win Version 7 01 into
130. input signal amplitude specification given for use with the external 10 dB attenuator connected applies Specification Tables The tables list the specifications for the RFA300 Measurement Set 8VSB All specifications are guaranteed unless labeled typical Typical specifications are provided for your convenience but are not guaranteed Specifications marked with the 7 symbol are checked in the Performance Verification procedures given in this service manual Performance Conditions The Performance requirements are valid within the environmental limits if the instrument was adjusted at 25 C 5 C and you allowed a minimum warm up time of 20 minutes The RFA300 measurement set is limited to situations where a single high ampli tude 8VSB RF signal is available for direct input to the measurement set RFA300 Measurement Set 8VSB Service Manual 1 1 Specifications RFA300 Measurement Set Specifications Table 1 1 Input specifications Characteristic Description RF Input Input Frequency Range Demodulation Modes Channel 7 through Channel 69 174 MHz to 806 MHz Outof channel Emission Modes 162 MHz to 818 MHz Input impedance 500 Return Loss Greater than 25 dB 174 MHz to 806 MHz typically greater than 30 dB Signal Amplitude Without external 10 dB attenuator 1 mW to 1W 0 dBm to 30 dBm Note The input power indicator indicates over amplitude power input beginning at 0 2 W 23 dBm The variable attenuator of the input cir
131. install the memory boards onto the controller board as shown in Figure 6 19 a Align memory board with controller board so that notch in memory board faces towards controller board fan Align the memory board contacts with the memory connector and press the memory board into the connector contacts With fingers located near both top edges of the memory board push memory board toward the controller board until the memory board snaps into the retaining clips Notch in memory board Install inside faces toward fan memory board first Tam 0 o 0 Figure 6 19 Memory board installation 6 32 RFA300 Measurement Set 8VSB Service Manual Maintenance Controller Board Removal Use the following procedure to remove the controller board and Replacement 1 Remove the four T15 screws that hold the controller board to mainframe chassis see Figure 6 20 for the screw locations Figure 6 20 Controller board orientation and screw locations 2 Carefully pull up on the controller board to loosen it from the backplane connectors 3 When the board is loose from the backplane connectors lift the assembl
132. instrument Instrument will not power off with On Standby switch The instrument Utilities may be set up to disable hard power off Check the setting ofthe instrument Utilities the instrument Utilities are located in the Windows 95 Control Panel The Windows 95 operating system may have a problem Try powering off the instrument using the Windows 95 shutdown procedure If the instrument still does not power off disconnect power cord and reconnect after 10 seconds to reboot the instrument RFA300 Measurement Set 8VSB Service Manual 6 7 Maintenance Checking the Power Supply Module The field service check of the power supply consist of checking the LED indicators in the power supply 1 Position the measurement set so that you can see into the chassis holes located on the right side of the cabinet Connect the power cord to the measurement set and press the On Stdy button to turn on the measurement set Check that the measurement set power ups and starts normal operation Look through the holes in the cabinet on the right side of the measurement set There is a slot in the front of the power supply module to view the LED power supply indicators The green LED should be lit If the red LED is lit at least one supply is out of tolerance or the Power good circuits are defective Remove the power supply module refer to Power Supply Removal and Replacement on page 6 29 and exchange it with a known good power supply
133. interchangeably with the more formal term RFA300 Measurement Set 8VSB The term platform refers to the mainframe platform that hosts the RFA300 Measurement Set 8VSB modules RFA300 Measurement Set 8VSB Service Manual BEEN ANN Introduction This manual contains maintenance information for the RFA300 Measurement Set 8VSB Take a few minutes to read this short introduction before doing any repair or service work on the instrument Before You Begin This manual is for servicing the RFA300 Measurement Set 8VSB To prevent injury to yourself or damage to the measurement set fulfill the following requirements before you attempt service m Besure you are a qualified service person m Read the Safety Summary found at the beginning of this manual m Read this sections Service Strategy When using this manual to service your RFA300 measurement set system be sure to heed all warning cautions and notes Service Strategy This manual contains the following maintenance and repair procedures Periodic maintenance Performance verification m Field adjustments m Module removal and replacement m Module level fault diagnosis Once you isolate a problem with a module use the Replaceable Parts List in this manual to determine the correct module part number to order from Tektronix RFA300 Measurement Set 8VSB Service Manual XV Introduction Tektronix Service Offerings Warranty Repair Service Repair Service Self Service
134. ircuit also provides the frequency accuracy of the synthesizer Two sources can provide a control voltage to the 10 MHz VCXO One source is derived from the pilot lock module when the measurement set is operating in the demodulation mode For out of channel emissions measurements the 10 MHz VCXO control voltage is derived from a D A converter Pilot Lock block diagram of the pilot lock module is shown in Figure 3 7 The 8VSB signals are transmitted as 8 level suppressed carrier digital signals A small amount of the carrier frequency a pilot signal is transmitted in an 8VSB broadcast to enable a receiver to lock to the carrier signal The pilot lock module provides the pilot lock function and produces specialized clock frequencies required to tune the measurement set and demodulate the 8VSB signal j Pilot Lock Module tol Signal 6 d Preset A I Signal E Pilot Lock Detect T N Pilot Loop gain Pilot Lock U signal r F O DX 7 Clamp y c i s 0 90 noS I Alarm Acquisition 43 05 MHz BW Acquisition Wide Clock 10 76 MHz Clock 2 Narrow 43 05 MHz 258 MHz Clock ius Power rails tht IRON To various circuit 2 up a
135. l the Hard Drive to the Bracket Assembly 6 26 Hard Drive Assembly Replacement 6 28 speaker Replacement e eR RR Roc RR rx RS EE 6 29 Power Supply Removal and Replacement 6 29 Removal and Installation of Memory onto the Controller Board 6 31 Controller Board Removal and Replacement 6 33 Interface Board Removal and Replacement 6 35 Backplane Circuit Board Removal and Replacement 6 38 Software InstallatiOD re Edad Rr PER E ERES 6 40 Preparing the Hard DISK RR REESE xr p 6 41 Partitioning the Hard Disk 0 0 0 0 eee ee eee eee 6 41 Formatting the Hard Disk eriten epi ee eee 6 41 Installing th Softwares wi sve nie b 6 41 Windows 95 OSR2 Installation Procedure 6 41 Configuring Power Management 6 43 Cirrus Logic Display Driver 0 0 0 cece eee eee 6 43 DynaPro SC3 Touch Screen Driver 6 44 Symbios 53C860 SCSI Driver 6 46 DEC DC21X4 NDIS 4 0 Ethernet 6 46 QA Plus Diagnostics sse steeri sete Eme ve teer ee eee 6 47 Installing Tektronix JPS Software 6 48 RFA300 Base Application Softwre Instal
136. lation 6 49 Installing RFA300 Hardware Drivers 6 51 RFA 300 Appearance e eee 6 52 Completing the Installation lees 6 53 iv RFA300 Measurement Set 8VSB Service Manual Table of Contents Repacking for Shipment 2 2 ee Re RR EUR RE 6 55 Obtaining Replacement Packaging eee ee 6 55 Repackaging Instructions 00 0 0 eee eee eee eee 6 56 Options Sc c 7 1 Replaceable Electrical Parts Diagrams Replaceable Parts Parts Ordering Information 10 1 Module i004 osse dba ere venta Site eb a eee bbs oka 10 1 Module Exchange Ree Re EQ eb RI Y EISE 10 1 Module Repair and Return 0 0 cee eee 10 1 New Modules sic cise carat inca eR eee eh DO EDS T wares 10 1 Using the Replaceable Parts List lelleleeeee tistis 10 2 Abbreviations cuocere hebr eee cep bbs eb E y bie es 10 2 Mfr Code to Manufacturer Cross Index 10 2 RFA300 Measurement Set 8VSB Service Manual V Table of Contents List of Figures vi Figure 1 1 IF filter characteristics 1 3 Figure 1 2 8VSB transmitter emissions mask 1 8 Figure 2 1 Transmitter connection 2 3 Figure 2 2 RFA300 measurement set rear view 2 4 Figure 2 3 Keyboard and monitor connections
137. le and the synthesizer module see Figure 6 5 for the cables to disconnect a Cable connector coupling between J2 of the synthesizer module and J0460 of the pilot lock module cable label 6 b Cable connector coupling between J1 of the synthesizer module and J0270 of the pilot lock module cable label 7 3 Press the release on the front side of the four conductor data connector at the top of the board near the rear and disconnect it from J7 4 Carefully pull up on the module to loosen it from the backplane connectors 5 When the module is loose from the backplane connectors lift the module up to gain access to the remaining interconnection cable J7 Data J 210 MHz Tune to cable connector J1Clock 1 to cable connector coupling coupling between the Synthesizer between the Synthesizer module and J 0270 module and J 0460 of the Pilot Lock of the Pilot Lock module cable label 7 module cable label 6 Figure 6 5 Synthesizer module Frac N board cable connections RFA300 Measurement Set 8VSB Service Manual 6 15 Maintenance 6 Disconnect J3 cable label 3 the LO signal 1 output to J3 of the down converter module LO input from the synthesizer module 3 LO signal 1 out to J 3 of the Down Converter module Figure 6 6 Synthesizer module connector locations 7 Place the removed module on a static free work surface Removing the Down
138. lter opening Atthe rear of the power supply attach the power supply to the chassis with two short screws and two long T15 screws 4 Plug the backplane ribbon cable onto the power supply module connector Removal and Installation controller board replacement module is provided with the memory boards of Memory onto the installed Routine servicing of the controller board does not require removal and Controller Board replacement of the memory boards on the controller Use the following proce dure to remove the memory boards Memory Board Removal 1 Remove the controller board from the mainframe to gain access to the memory board retaining clips Refer to Controller Board Removal and Replacement on page 6 33 for removal instructions 2 Starting with the controller board upper location the controller board remove the memory boards as follows a Use your finger tips to release both of the memory board retaining clips While holding the clips open move the top edge of the memory board out of the clips RFA300 Measurement Set 8VSB Service Manual 6 31 Maintenance With the top edge of the memory board out of the retaining clips carefully pull the memory board out of the connector on the controller board Place the removed memory board in an antistatic container Repeat a b c to remove the inside memory board Memory Board Installation 1 Starting with the memory board nearest to the controller board
139. mance Verification Keypad Tests Table 4 2 Keypad test E With touch screen point to and select Keyboard Using the touch screen point to and select Run Tests In the Keyboard Test window point to and select OK On the front panel keypad press each keypad button Check that the corresponding keyboard keys have been muted changed to gray on the LCD display see Table 4 2 a Ifa keyboard key has already been muted changed to gray by a previous keypad button the keypad button being tested can still be detected by a slight glitch in the display key when the button is pressed This indicates that the keypad button is working Repeated pressing of a button will help detect the glitches Keypad button Keyboard equivalent Keypad button Keyboard equivalent Up Arrow Up Arrow Fctn Lighted Fctn Key illuminates F1 F12 F1 F12 Down Arrow Down Arrow Del Del Right Arrow Right Arrow lt Backspace Bksp Left Arrow Left Arrow lt Enter Enter Select Space Bar Shift Lighted Shift Run Stop Ctrl R ESC Esc i TAB TAB 0 0 Print Ctrl P 1 1 Touch Screen Ctrl Alt T 2 2 key light toggles Insert INS 3 3 Help F1 4 4 Print Screen PrSn 5 5 Windows Icon Start Menu 6 6 Esc to clear Ctrl Ctrl Lighted 7 7 Alt Alt Lighted 8 8 Space Space Bar 9 9 6 With touch screen or mouse point to and select Stop 4 18 RFA300 Measurement Set 8VSB Service Manual Performance Verifica
140. manufacture as well as the following information Complies with the DHHS rules 21 CFR Chapter 1 Subchapter applicable at the date of manufacture 15 C to 50 C 2000 meters Testand measuring Class 1 as defined in IEC 1010 1 Annex H grounded product Overvoltage Category Il as defined in IEC 1010 1 Annex J Pollution Degree 2 as defined in IEC 1010 1 Note Rated for indoor use only Supply Voltage Range 100 240 VAC 50 60 Hz single phase Current Rating 6 0 Amps max Fuse Rating Mains fuse is 8A 250V Fast Not operator replaceable Refer servicing to qualified service Relative Humidity maximum operating personnel 80 for temperatures up to 31 C decreasing linearly to 50 at 40 C RFA300 Measurement Set 8VSB Service Manual 1 17 Specifications Mechanical Physical Characteristics Table 1 12 Mechanical characteristics Characteristic Description Classification Transportable platform intended for design and development bench lab based applications Overall Dimensions Height 8 5 inches w o feet 21 6 cm Width 17 inches 43 2 cm Depth 22 inches 55 9 cm Weight RFA300 38 10 17 2 kg Maximum loaded pouch 10 Ib 4 5 kg Shipping Weight 74 Ib 33 kg Construction Materials Chassis parts are constructed of aluminum alloy and aluminized steel front panel and trim pieces are constructed of plastic circuit boards are constructed of glass and or ceramic glass laminate 1 Pouc
141. ment 12 Place a cursor on the peak of the second RF signal see Figure 4 16 Use the zoom feature to better position the cursor at the peak Record the reading see the RFA300 test record form on page 4 4 The zoom feature automatically rescales the display area bounded by a box defined with the mouse Position the mouse cursor where you want to start the box Hold down the left mouse button and draw a box that defines the area you want to zoom 4 32 RFA300 Measurement Set 8VSB Service Manual Performance Verification GA RFA 300 Out of Channel Emissions File Edi View Setup Run Stop Tools Window Help Setup Smoothing Hin 7 Qut of Channel Spectrum Out of Channel Power to Average Power Lower Channel 67 5 dB Upper Channel 67 8 dB Adjacent Channel Mask Test Pass C 3 Channels C Fast Update 5 Channels Enhanced Accuracy Amplitude Freq Cursors dB MHz 647 0 02 4141 120 A 1788 12 68 Running Current 9 28 98 2 12 29PM Tektronix Figure 4 16 Out of Channel measurement accuracy test showing initial second tone amplitude 13 Decrease the amplitude of the CW signal in 10 dB steps and check that the amplitude measurement tracks the generator output amplitude for each step as shown in Figure 4 17 see NOTE below Record the cursor readings at each step and calculate the difference for each step NOTE For each step change
142. ment Connector DB 9 purchased or user fabricated loop back connector RFA300 Performance Verification and Tektronix part number Field Adjustment Software disk 063 3247 00 1 Adapter types depend on the coaxial cables used to make the signal interconnec tions The example adapters assumes a coaxial cable with BNC connectors If you use interconnection cables with SMA connectors and N type connectors where needed to make the connections additional adapters are not required Test equipment 5232 loop back connector Example See Figure 4 1 for the wiring diagram Performance verification software DB 9 Female Connector Rear View Pin Signal Name Abbreviation Pin 1 Carrier Detect CD Pin2 Receive Data RD Pin3 Transmit Data TD Pin4 Data Terminal Ready DTR Pin5 Signal Ground 5G Pin6 Data Set Ready DSR Pin7 Requestto Send RTS Pin 8 Clear to Send CTS Pin9 Ring Indicator Rl Figure 4 1 RS 232 loop back connector wiring diagram RFA300 Measurement Set 8VSB Service Manual 4 3 Performance Verification RFA300 Test Record RFA300 Test Record Instrument Serial Number Temperature Date of Calibration Channel Frequency Certificate Number RH 96 Technician RFA300 performance test Residual S N Residual EVM Residual MER Residual Flatness Error Residual Group Delay Error Residual P hase Noise Return Loss Out of Channel Measurement Li
143. ment Set 8VSB Service Manual 5 3 Adjustment Procedure LO Low Resonator Check and Adjustment The purpose of the LO Low resonator adjustment is to center the resonator in order to produce the correct oscillator tune range and keep the phase noise low The resonator must be manually adjusted before the LO LOW automatic calibration of the V F curves for every band is performed A LO LOW calibra tion must always be done immediately after the resonator is adjusted or the stored calibration values will be wrong The measurement set application software initiates automatic recalibration in every band when the resonator frequency drifts due to time and temperature LO Low Resonator 1 Exitthe RFA300 application if running Check Procedure In the RFA300 PV folder double click on the Hwui icon In the Hwui window select Synthesizer see Figure 5 1 Y In the Synthesizer window make the following selections a Select LOLow Filter 1 b Set LO Freq MHz 200 000 c Set Tune Src Internal d Set Coarse Tune 50 5 Press the Update button in the FracN Board box NOTE The above steps are very important if any of the steps above are not done correctly all the steps below will de tune the LO low 6 Press the Update button in the Lock Indicators box 7 Check the Lock Indicators a Select UPDATE and note whether the boxes are checked b Verify that LO Latch Lock and LO RT Lock are checked c Note the
144. mit Out of Channel Accuracy 7 dBm 17dBm 27 dBm 37 dBm 47dBm 57 dBm 44 Measured value Test limit z 40 dB 51 2 40 dB 0 25 dB peak to peak lt 8 ns peak to peak lt 105 dBc Hz at 20 kHz offset 30 dB 80 dB Measured value Calculated step size Step size test limits 10dB 2 08 10dB 2 08 10dB 2 08 10dB 2 08 10dB 2 dB RFA300 Measurement Set 8VSB Service Manual Performance Verification Measurement Set Power On On Stby switch 1 Connect the keyboard to the keyboard port located on the lower left side panel at the front of the measurement set Connect the mouse to the mouse port located on the lower left side panel at the front of the measurement set Connect power cord to the mainframe power supply connector located on the rear of the measurement set NOTE The RFA300 measurement set may begin to power up upon connecting the power cord 4 Push the measurement set front panel On Stby button see Figure 4 2 for the location Tektronix RFA 300 Measurement Set 8VSB Figure 4 2 On Stby switch 5 Before the measurement set starts loading Windows 95 perform the following check Check that the keypad buttons highlighted in Figure 4 3 light up during boot up If there is doubt about whether or not any of the buttons lighting up during boot up then push the
145. n be serviced through one of the following three options Contact your local Tektronix service center or representative for repair assistance In some cases you may exchange your module for a remanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800 TEK WIDE extension 6630 You may ship your module to us for repair after which we will return it to you You may purchase replacement modules in the same way as other replacement parts RFA300 Measurement Set 8VSB Service Manual 10 1 Replaceable Parts Using the Replaceable Parts List This section contains a list of the mechanical and or electrical components that are replaceable for theRFA300 Measurement Set 8VSB Use this list to identify and order replacement parts The following table describes each column in the parts list Parts List Column Descriptions Column Column name Description Figure amp Index Number Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow Tektronix Part Number Use this part number when ordering replacement parts from Tektronix Serial Number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers
146. n set Smoothing to High 8 Check Freq Resp peak to peak is less than 0 25 dB 9 Check Group Delay peak to peak is less than 8 ns 10 In the toolbar restore Smoothing to the previous setting and then click on Home 11 From the Home window click on the Phase Noise icon 12 In the toolbar set Smoothing to High 13 Wait two minutes for smoothing to be fully effective and then use a cursor to check that the phase noise curve is less than 105 dB at 20 kHz If there are any failures in the preceding RFA300 operational checks do the Normalize the RFA300 procedure starting on page 5 2 in the Adjustment Procedure section RFA300 Measurement Set 8VSB Service Manual 4 23 Performance Verification LO LOW Resonator Check LO LOW Resonator Check 4 24 Procedure The purpose of the LO LOW resonator check is to verify that the resonator is properly set to provide the correct oscillator tune range and low phase noise 1 Exitthe RFA300 measurement application if running In the RFA300 PV folder double click on the Hwui icon to run the hwui exe program This program displays a control screen the Hardware User Interface HwUi used in making the various checks and adjustments in the RFA300 Select Synthesizer see Figure 4 11 Select LOLow Filter 1 Set LO Freq MHz 200 000 Set Tune Src Internal Set Coarse Tune 50 9 n 9 un ROC Press the Update button in the FracN Board box NOTE THE ABOV
147. n the left side of the cabinet see Figure 6 1 These screws attach to post mounted on the power supply module Handle mounting screws El Figure 6 1 Right side handle screws 6 Remove the screws from the four feet on the rear of the mainframe chassis 6 10 RFA300 Measurement Set 8VSB Service Manual Maintenance Rear feet screws Figure 6 2 Rear panel feet removal 7 Use either an adjustable wrench or appropriate size open end wrench as lever to pry the cabinet loose from the chassis Loosen each side alternately until the cabinet is released from the EMI gasketing 8 Slide the cabinet up and off the chassis
148. ndow notice that the measurement runs and provides results soon after the window opens To stop the measurement press the Stop button located in the toolbar To restart press the Run button Saving Results After making a measurement you can easily save your results to a database using the following steps 1 Go File menu and select Save Results As 2 Enter the file name destination and any notes you want saved with the results You can print results or export them to other applications using the Report dialog box selected in the File menu You can also recall results for further study at any time Signal Monitor The Signal Monitor allows you to continuously monitor one or more of the other measurement s numeric results in one window To select the measurements to monitor do the following steps 1 Open the Signal Monitor window RFA300 Measurement Set 8VSB Service Manual 2 15 Operating Basics 2 Click Setup in the Toolbar 3 Select the measurements you want to monitor 4 Select either how often you want your results to be automatically saved or Off to disable the auto save function 5 If you selected At Intervals in step 4 enter the amount of hours to save between AutoSave actions NOTE An indication of how long the instrument can run before running out of space is provided Click the File Size button to limit the size of your result database files Refer to Limiting the size of a results database file
149. ng Laboratory Listing Canadian Certification Additional Compliance Installation Overvoltage Category Compliance was demonstrated to the following specification as listed in the Official J ournal of the European Union Low Voltage Directive 73 23 EE C amended by 93 69 EEC EN 61010 1 1993 Safety requirements for electrical equipment for measurement control and laboratory use ANSI ISA 582 01 1994 Safety standard for electrical and electronic test measuring controlling and related equipment CAN CSA C22 2 No 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use UL3111 1 Standard for electrical measuring and test equipment IEC61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Terminals on this product may have different installation overvoltage category designations The installation categories are CAT III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT II Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment 1 16 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 11 Certifications and compliances Cont Category Standards or d
150. ng charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL
151. normal operation of the product The software is provided on a floppy disk as an accessory to this service manual Perform the procedure once every 12 months of operation to ensure that the performance is within tolerance The RFA300 measurement set is limited to situations where a single high ampli tude 8VSB RF signal is available for direct input to the measurement set The tests in this section require that the following performance conditions be met The Performance requirements are valid within the environmental limits if the instrument was adjusted at 25 C 5 C and you allowed a minimum warm up time of 20 minutes RFA300 Measurement Set 8VSB Service Manual 4 1 Performance Verification Equipment Required 4 2 The instrument must be in an environment with temperature altitude humidity and vibration within the operating limits described in the Specifications section m The instrument must be powered from a source maintaining voltage and frequency within the limits described in the Specifications section Any conditions that are unique to a particular characteristic are expressly stated as part of the characteristic Table 4 1 lists the test equipment needed to complete the Performance Verifica tion procedure The table identifies examples and minimum tolerances where applicable If you substitute other equipment for the examples listed in Table 4 1 the equipment must meet or exceed the toleranc
152. nt bezel snaps onto the chassis There are three snaps across the top and three across the bottom Remove the front panel bezel as follows 1 Use pliers to grasp the On Stby key and pull straight out on the key to disconnect the key cap from the switch 2 Use your fingers to lift up on the back edge at the top of the bezel to release the bezel from the snaps If you use a tool for leverage be careful not to bend the fingers of the EMI shielding strips 3 After you have released the snaps across the top pull the top of the bezel toward you slightly to clear the chassis This should release the bottom of the bezel from the chassis 4 Liftthe bezel off the front of the chassis Removing the RFA300 cabinet must be removed to access any of the RFA300 application modules Cabinet and to access the mainframe modules and cable connectors to the controller board Use the following procedure to remove the cabinet 1 Besure that you are wearing a static grounding wrist strap 2 Before removing the cabinet shut down the RFA300 measurement set and unplug the power cord 3 Disconnect any cables connected to the rear panel connectors of the measurement set Note their locations for reinstallation RFA300 Measurement Set 8VSB Service Manual 6 9 Maintenance 4 Put the protective front cover on the measurement set and sit the cabinet upright on the working surface with the rear panel up 5 Remove the two screws from the handle o
153. ny software problems can be due to corrupted or missing software files In most cases the easiest way to solve software problems is to reinstall the software and follow the on screen instructions Refer to Software Installation on page 6 40 for instructions on reinstalling software Refer to Table 6 2 for a list of software and hardware troubleshooting informa tion and recommended action If you suspect problems with the software contact your local Tektronix representative or refer to Contacting Tektronix on page Hardware problems can have several causes The first step to identifying a problem is to review the installation instructions in this manual to verify that you have properly installed the instrument If you are certain that you have installed the instrument correctly run the extended diagnostics located under the tools menu to identify any problems with the individual modules If your instrument powers up so that you have access to the desktop run the QAPlus diagnostics software to identify possible controller hardware problems Follow the QAPlus online help instructions for running the diagnostics software The diagnostics are located in the Windows 95 Start menu under Programs QAPlus_ Win Win Table 6 2 lists some of the symptoms of hardware problems and possible solutions Possible causes and recommended action Verify that all power cords are connected to the instrument and to the pow
154. of the adjustment procedure RFA300 Measurement Set 8VSB Service Manual This section provides service information for the RFA300 Measurement Set 8VSB Information about the following topics is provided Handling Static Sen sitive Components Cleaning and Inspection Removal and Replacement Instructions Diagnostic tests and Troubleshooting Preparation These maintenance instructions are for qualified technicians Be sure to read the Safety Summaries at the front of the manual before beginning service Prior to removing the cabinet from the product read Handling Static Sensitive Components static free environment Observe standard handling precautions for static sensi tive devices while maintaining this product Always wear a grounded wrist strap grounded foot strap and static resistant apparel CAUTION To prevent static discharge damage service the product only in a Handling Static Sensitive Components This instrument contains electrical components that are susceptible to damage from static discharge Static voltages from 1 kV to 30 kV are common in unprotected environments Table 6 1 shows the relative static discharge susceptibility of various semiconductor classes Table 6 1 Static susceptibility Semiconductor class Voltage ECL 200 V 500 V Shottky Signal Diodes 250 V Shottky TTL 500 V HF Bipolar Transistors 400 V 600 V J FETs 600 V 800 V Linear Micro
155. of the chassis RFA300 Measurement Set 8VSB Service Manual 6 21 Maintenance 6 Disconnect the floppy drive cable from the floppy drive connector Lift up the locking latch on the floppy drive connector to release the interconnection cable and pull up on the cable to separate it from the connector 7 Disconnect the audio cable from the CD drive four pin connector see Figure 6 13 8 Disconnect the CD drive cable from the Controller board 9 Slide the CD and Floppy Disk Drive assembly out through the front of the chassis You may have to lift the front of the assembly slightly to clear the EMI shielding fingers 10 When the CD drive cable connector is clear of the front of the chassis carefully disconnect it from the CD drive connector adapter board Removing and Replacing floppy disk drive and the CD drive are assembled in the same unit but can the CDROM Drive separately replaced 1 Remove the four crosstip screws that hold the CD drive to the chassis 2 Slide the CD drive out of the lower bay of CD and floppy drive chassis Figure 6 11 Chassis screw locations for CD drive Reinstall the CD Drive 1 Insert CD drive into lower bay of CD and floppy drive chassis 6 22 RFA300 Measurement Set 8VSB Service Manual Maintenance 2 Align CD drive mounting holes with chassis holes 3 Attach CD drive to chassis with four crosstip screws Torque the screws to 2 in lbs Removing and Replacing
156. oint to and select Cancel Floppy Drive Tests 1 With touch screen point to and select Floppy Drives box In the Test Selection box select the Butterfly Access Test for the first test Deselect all other tests Using the touch screen point to and select Run Tests PF gt When instructed insert a virus free diskette into drive A then point to and select OK 6 Wait for the Test Results window to appear a Ifthe Pass completed successfully message appears then point to and select OK b Ifa failure message appears refer the problem to a qualified service person 7 Upon passing tests point to and select Cancel 8 Eject the diskette Keyboard Tests 1 With the touch screen point to and select Keyboard With touch screen point to and select Run Tests In the Keyboard Test window point to and select OK On the keyboard press each of the top row keys a PF amp mS Check that all the top row keys have been muted changed to gray on the LCD display e With touch screen or mouse point to and select Stop 7 In Keyboard Test window look at the test results a Ifthe Pass completed successfully message appears point to and select OK b Ifa failure occurred during the keyboard test refer the problem to qualified service person 8 Upon passing tests point to and select Cancel RFA300 Measurement Set 8VSB Service Manual 4 17 Perfor
157. on the rear of the instrument Refer to Figures 2 1 and 2 2 to connect the RFA300 measurement set to your transmitter and for other connections The standard instruments prior to serial number B010194 have an internal 20 dB input attenuator Modified instruments and those after B010194 have an internal 10 dB input attenuator and are provided with an external 10 dB attenuator that can be connected in series at the RF input connector Connect the RFA300 measurement set to your transmitter in a manner that ensures the instrument will receive only one channel Power to the RFA300 measurement set must be greater than 1 milliwatt and less than 1 watt for the internal 10 dB attenuator If you either have an internal 20 dB attenuator or connect the external 10 dB attenuator to the internal 10 dB input attenuator the input power range is greater than 10 milliwatts to less than 2 watts Transmitter Channel filter Sample output Power input gt 1 mW 1 W without 10 dB attenuator gt 10 mW lt 2 W with 10 dB attenuator RFA300 Figure 2 1 Transmitter connection NOTE Without the external 10 dB attenuator for those instruments that have the internal 10 dB attenuator rather than the 20 dB internal attenuator the input power indicator indicates over amplitude power input beginning at 0 2 W 23 dBm The variable attenuator of the input circuitry has enough range to handle up to 1 W at the input connector Interface Connectors The
158. onfiguration Complete window select No I will restart my computer later and then click FINISH 6 When the Mfg Configuration Complete dialog box disappears from the display window press any key to continue The user files setups masks RFA300 Measurement Set 8VSB Service Manual Performance Verification colors etc that were saved at the beginning of this procedure are now all restored 7 Verify that the RFA300 PV folder is removed from the desktop 8 Remove the RFA300 Performance Verification and Field Adjust Software disk from the floppy disk drive 9 In the Shut Down Window select Restart the Computer and then click Yes 10 Start the RFA300 application if it does not start automatically 11 Verify that RFA300 application starts as it should and that the Tek Only menu item is removed from the RFA300 menu bar 12 Exit the RFA300 application and shut down the computer as described in the following Measurement Set Shut Down procedure RFA300 Measurement Set 8VSB Service Manual 4 35 Performance Verification Measurement Set Shut Down 1 Move the cursor to the box titled Start 2 With cursor pointing to the Start box click the mouse select button 3 Move the cursor to the box titled Shut Down see Figure 4 18 Programs b Documents Eh Settings Li A Find s e Help Hg z Cy Shut Down Figure 4 18 Window95 Start window 4 With cursor pointing to Shut Down click the mouse sele
159. onnect the test equipment RFA300 Measurement Set 8VSB Service Manual 4 29 Performance Verification Out of Channel Measurement Limits This check measures the difference between the peak RF signal power and the noise floor to determine if the measurement limit meets the specification of 80 dB or more Make the check using the following procedure 1 2 Start the RFA300 application if it is not running If not on the Home window click on the Home icon In the Home window click on the Out of Channel icon In the Out of Channel measurement window select 5 Channels mode and Enhanced Accuracy in the toolbar select High Smoothing Set the RFA300 measurement set to any frequency within the measurement range of the set For example use 686 MHz Set the RF signal generator carrier frequency to 2 67 MHz above the RFA300 measurement set frequency To set it for the example given in step 4 set the generator for 688 67 MHz Set the signal generator for frequency modulation of the carrier at 100 kHz with a deviation of 80 kHz sine wave modulation Set the signal generator for an RF output power of 10 dBm Connect the signal generator output to the RF input connector of the RFA300 measurement set Use the RFA300 measurement set delta markers to compare the peak signal power to the noise floor as shown in Figure 4 14 a Set the cursor at the peak of the RF signal Use the zoom feature to expand the waveform to better
160. ontrol knob using the following steps 1 Use the mouse or the touch screen to point to and click on the Start icon 2 With the mouse or touch screen point to and click on Run as indicated in Figure 4 10 3 Type the following command knobtest exe 4 Press the keyboard Enter key 5 Turn the keypad knob in both directions and observe the results Programs Documents Settings b End za Run Windows9b5 hj Shut Down Figure 4 10 Run selection in the Start menu 6 Check that the size of the window changes when the knob is turned If the size of the window does not change refer the problem to a qualified service person 7 Upon passing the knob test select OK 4 20 RFA300 Measurement Set 8VSB Service Manual Performance Verification RFA300 Operational Checks The following operational checks for the RFA300 Measurement Set 8VSB test that the measurement capability of the measurement set meets the stated specification accuracy While performing these tests ignore any masks or test limits that are enabled or set ignore any pass fail indications displayed do not change any mask or test limit settings NOTE The tests in this procedure can be performed on any television channel in the range of 174 MHz to 806 MHz channel 7 to channel 69 If you have no preferred channel the Normalization and testing should be done on channel 50 pilot frequency is 686 31 MHz to a
161. ools menu select Diagnostics and click on the Extended Diagnostics tab m QAPlus diagnostics The QAPlus diagnostics are a separate Windows 95 application located in the Windows 95 Start Programs menu The diagnostics check the basic operation of the controller including the following items system board video hard disk memory communications port printer port mouse and keyboard Use the diagnostics to isolate problems to software or hardware within the instrument For additional help on the diagnostics contact your local Tektronix representative Software Problems Your RFA300 Measurement Set 8VSB comes with software already installed For any suspected software problems try to isolate the problem to the measure ment set application software or to other installed software Before running any of the diagnostics you should check the online release notes to verify the instrument software matches the module firmware Run the QAPlus diagnostics software to identify hardware or software problems Follow the QAPlus online help instructions for running the diagnostics software RFA300 Measurement Set 8VSB Service Manual 6 5 Maintenance Hardware Problems Table 6 2 Troubleshooting Symptom Instrument does not power on Display is blank Instrument powers on but does not complete the power on sequence Power on diagnostics fail 6 6 The diagnostics are located in the Start menu under Programs QAPlus Win Win Ma
162. or the driver in disk 2 type the path to the files as D DRIV ER Cirrus Disk2 and click the OK button RFA300 Measurement Set 8VSB Service Manual 6 43 Maintenance 6 44 DynaPro SC3 Touch Screen Driver 13 After the driver is loaded click the Close button to close the Advanced Display Properties dialog box 14 Click the Close button to close the Display Properties dialog box It will prompt you to restart the instrument click the Yes button to restart 15 When the instrument is restarted close the Color Correction dialog box This procedure adds the driver for the Touch Screen feature To add the driver do the following steps 1 Insert the CD ROM labeled RFA300 Measurement Set 8VSB Application Software into the CD ROM drive Press the START front panel key and enter the Run menu Type D DRIVER Dynapro Vinstall exe Click Next to continue Y Select the following communication port settings Port COM3 Interrupt IRQ4 m I O Address 3E8 Click Next to continue Click Install to continue Click OK to continue FAS When asked for the directory for default ini do not use the Browser Type in D DRIVER Dynapro A dialog box may appear stating that the COM port is being used by another device Select Yes to assign the COM port to touch screen 10 After the driver is installed click Yes to restart the instrument 11 Open the Control Panel and select the System icon 12 Select t
163. ow Filter 5 7 Set Coarse Tune to the value associated with 21 52 MHz Example Coarse Tune 100 8 Press Coarse Tune button in the FracN Board box 9 Push Ref Src to External 10 Push Update in the Lock Indicators box All four lock indicators should be check marked If the FracN lock indicators are not check marked the LOLow Filter or Coarse Tune or both may be wrong 11 Measure the signal frequency with the spectrum analyzer counter Note The signal amplitude is low usually about 50 dBm 12 Check the counter measurement for the following condition Frequency is greater than 430 487 000 Hz and less than 430 492 000 Hz 13 Close the hwui application If the counter measurement is not within the frequency limits given above do the 66 1 MHz VCXO Frequency Adjustment procedure starting on page 5 10 in the Adjustment Procedure section RFA300 Measurement Set 8VSB Service Manual 4 27 Performance Verification Input Return Loss Check 4 28 This test checks that the input impedance of the RFA300 measurement set meets the specification for a return loss of greater than 25 dB over the designed frequency range Make the test using the following procedure 1 Setup the test equipment as shown in Figure 4 12 Do not connect the SWR bridge to the RF input of the RFA300 RFA300 Analyzer rear Spectrum analyzer with tracking generator Rear panel RF input connector N type barrel conne
164. point to and select Run Tests 4 Verify that the Black Color Test appears on the measurement set display see Figure 4 7 RFA300 Measurement Set 8VSB Service Manual 4 13 Performance Verification Polarizer check screen Black Color Test Is the screen black e 3 Games Figure 4 7 Black color test screen 5 Check that the display screen has none of the defects listed below a b c d Scratches Bubbles wrinkles or dents Objects or dust trapped in display screen If defects are found refer them to a qualified service person 6 Upon passing checks point to and select Yes 7 Verify that the White Color Test screen appears on the measurement set display see Figure 4 8 4 14 RFA300 Measurement Set 8VSB Service Manual Performance Verification Dust Contamination check screen White Color Test Is the screen white Yes Cancel Figure 4 8 White color test screen 8 Check that the display screen has none of the defects listed below a Dustor contamination b Finger prints 9 If defects are found refer the problem to a qualified service technician 10 Upon passing checks point to and select Yes LCD Display 1 Verify that the Red Color Test appears on the measurement set display see Red Green Blue Pixel Figure 4 9 Checks 2 Position your eyes approximately 18 inches from the display screen 3 While viewing the screen from left to right side
165. position the cursor on the peak b Setthe cursor on the center the noise floor at 12 MHz from the carrier Check that the difference reading is equal to or greater than 80 dB 1 The zoom feature automatically rescales the display area bounded by a box defined with the mouse Position the mouse cursor where you want to start the box Hold down the left mouse button and draw a box that defines the area you want to zoom 4 30 RFA300 Measurement Set 8VSB Service Manual Performance Verification G amp RFA 300 Out of Channel Emissions Bm Ei File Edit View Setup Run Stop Tools Window Help BAS seve e 9 5s Out of Channel Power to Average Power Sutar spec Lower Channel 63 5 dB Upper Channel 63 4 dB C Channels C Fast Update 5 Channels Enhanced Accuracy Amplitude Freq Cursors dB MHz 6 48 0 02 74 48 12 92 80 96 12 90 Current 9 28 98 2 01 56 PM Tektronix Running Figure 4 14 Out of Channel Measurement limits test Out of Channel Accuracy This test checks the accuracy of the out of channel signal amplitude measure ment using a second signal of known accuracy Make the check using the following procedure 1 If not on the Home window click on the Home icon In the Home window click on Out of Channel icon 2 In the Out of Channel measurement window select 5 Channels mode
166. quality of the input signal path is critical in obtaining the full specified performance of the RFA300 measurement set Therefore you must connect the RFA300 measurement set to your transmitter using high quality cable and connectors The following list provides the requirements needed for the RF connection m Hold the nonflatness of the input signal to approximately 0 05 dB P P or less over the width of the channel W Keep the station s radiated signal to at least 63 dB down from the sampled signal in the line by using appropriate shielding m The cable with connectors must have a return loss of at least 26 dB VSWR lt 1 10 over the channel width and a loss tilt of less than 0 02 dB over the channel width This assumes that the tap used to obtain the signal has a return loss of gt 30 dB VSWR lt 1 065 High quality cable and connectors are required to meet the listed requirements The connectors should be precision grade at both ends of the cable The best cable type is dependent on the run length and operating frequency The return loss requirement is hardest to meet at high frequencies while the loss tilt is hardest to meet at low frequencies In either case minimize the difficulties by using only a few feet for cable length Longer lengths 50 feet or more place extreme requirements on cable quality specifications RFA300 Measurement Set 8VSB Service Manual Getting Started The RF connection to your transmitter is located
167. r length 72 inches 012 0114 00 Adjustment tool Plastic handle small metallic Tektronix part number bit Less than three inches 003 1433 01 overall 8VSB Reference Signal Frequency in the range of Customer provided 8VSB Source 174 MHz to 806 MHz channel digital TV test signal source 7 to channel 69 output power in the range of 10 mW to 2 W 10 dBm to 33 dBm Performance verification and RFA300 Performance Verifica Tektronix part number adjustment software tion and Field Adjustment 063 3247 00 S oftware diskette RFA300 Measurement Set 8VSB Service Manual 5 1 Adjustment Procedure Normalize the RFA300 The normalization procedure is required if any of the RFA300 Operational Checks starting on 4 21 failed Normalization is a software routine that performs internal measurements and adjustments of the hardware to optimize the operation of the RFA300 measurement set NOTE Normalization can be performed on any television channel in the range of 174 MHz to 806 MHz channel 7 to channel 69 If you have no preferred channel normalization should be done on channel 50 pilot frequency is 686 31 MHz to assure the best operation of the range of channels 1 Connect RF input connector of the RFA300 measurement set to the 8VSB reference quality signal using a 50 2 coaxial cable with N type connectors or the appropriate adapters on both ends With 20 dB of input attenuation the signal power applied to the RFA300 m
168. reduces instrument breakdown and increases reliability You should clean the instrument as needed based on the operating environment Clean the entire RFA300 measurement set often enough to prevent dust and dirt from accumulating Dirt can act as a thermal insulating blanket that prevents effective heat dissipation In addition dust buildup can provide high resistance electrical leakage paths between conductors or components in a humid environ ment Clean the exterior surfaces of the instrument with a dry lint free cloth or a soft bristle brush If dirt remains use a cloth or swab dampened with a 75 isopropyl alcohol solution A swab is useful for cleaning in narrow spaces around the controls and connectors Do not use abrasive compounds on any part of the instrument RFA300 Measurement Set 8VSB Service Manual Maintenance CAUTION Avoid getting moisture inside the instrument during external cleaning and use only enough solution to dampen the cloth or swab Do not wash the front panel On Standby switch Cover the switch while washing the instrument Use only deionized water when cleaning Use a 7596 isopropyl alcohol solution as a cleanser and rinse with deionized water Do not use chemical cleaning agents they may damage the instrument Avoid chemicals that contain benzene toluene xylene acetone or similar solvents Display Clean the face of the display screen using a soft lint free dampened cloth Compact Dis
169. remainder of the system including the fans and distributes the system clock All communication to from and between the system modules is supported Mainframe Controller controller module mounts vertically in the center of the card cage It connects into the PCI backplane through a standard 32 pin PCI connector An additional 64 bit PCI connector provides for I O communication to the back plane and through the backplane provides I O to the rear panel and interconnec tions to the front panel assembly Front Panel Interface front panel interface assembly interconnects the system controller with the LCD flat panel display the floppy disk drive the CD drive front panel keypads the touch panel and the mouse and keyboard ports The PC speaker audio is also routed from the controller to the speaker through the front panel interface LCD Flat Panel Display backlighted 10 4 inch diagonal Active Matrix Thin Film Transistor TFT LCD panel provides the internal color display To extend the life of the backlight and prevent burning of the TFT LCD screen the cold cathode fluorescent backlight can be dimmed to 6046 of its maximum brightness with a custom screen saver or mainframe utilities applet A DC switching regulator board included as part of the display assembly provides the backlight high voltage RFA300 Measurement Set 8VSB Service Manual 3 3 Theory of Operation Touch Panel Hard Disk Drive Floppy Disk Drive
170. requency of the local oscillator LO signal used in the frequency conversion The synthesizer module provides the local oscillator signal to the down converter module and also routes the power and control signals to the down converter module The acquisition module digitizes the IF signal applied from the down converter at four times the pilot IF the symbol frequency rate Local memory in acquisition module holds the digitized signal until it is accessed by the main frame CPU The system CPU under control of the RFA300 measurement set application software programming demodulates the digitized 8VSB signal and measures the signal s characteristics Down Converter Module Narrow Band Channel Iu Input ics RE Module ys es dr A D gt Memory I fa m MD or ass Filter e gt A Mainframe Power and uen Interface Shielded Aluminum Control Interface pem L Housing ZAL ___ LJ 1 N Power and Broadband 43 MHz w Loma y y Conta Y E Signal _ Shielded mon Shielded Pel Card PCI Card Y Y Y iL gt CD wn o a A Uy 28 PilotLock le Frequency Dividers rt tot yf Synthesizer Pilot Lock Mainframe Module Mainframe Interface
171. requirement In the event interference is caused to any service greater attenuation may be required gt 70 is dB as defined by the 5 measurement method 2 dB over a range of 12 MHz with respect to the edges of the channel in use 3 dB Shows the integrated power present in upper and lower adjacent channels Plots the deviation of the transmitter s spectral amplitude as a function of frequency with respectto the ideal 8VSB root cosine transmitter curve Measurements are made from 0 to 45 68 MHz with respect to the pilot frequency of the signal under test 0 25 0 05 measured amplitude deviation dB 0 25 dB peak to peak error over the frequency range Plots deviation ofthe transmitter s spectral group delay response from the ideal The ideal group delay response is zero variation over the channel bandwidth From 0 kHz to 5 68 MHz with respect to the pilot frequency of the signal under test 4 0 2 x p p measured group delay deviation ns Residual Group Delay Error 8 ns peak to peak over the frequency range Amplitude Error Accuracy Plots the transmitter s instantaneous amplitude error as a function of amplitude This error is typically caused by an amplifier s gain changing because of signal amplitude 0 1 40 2 x dB measured amplitude error dB Phase Error Residual Phase Accuracy RFA300 Measurement Set 8VSB Service Manual Plots the si
172. rl Button with LED Control key LED indicates when keypad is in control mode Refer to Table 2 3 for a list of control functions sticky key feature Alt Button with LED Alternate key LED indicates when keypad is in alternate mode sticky key feature Space bar or use as mouse button 1 Button with LED Shift key LED indicates when keypad is in shift mode sticky key feature Table 2 3 Control key combination functions Control key Function Ctri A Invokes the AutoS cale function Ctri B Opens the previous window Ctrl C COPY Ctrl F Opens the following window Ctrl H Opens the Home Window Opens Keypad dialog box when the Keypad is displayed a dialog box Ctri 0 Opens the Recall Results dialog box Ctrl P Prints the measurement Ctrl S Saves the results of the current measurement Ctrl T Activates the Touchscreen Ctrl V PASTE Ctrl X CUT Ctri Y REPEAT Ctrl Z UNDO Touch Screen The touch screen allows you to use your finger to point to and activate controls as a substitute for the mouse cursor and buttons Move your finger around the screen to simulate mouse movement Tap the screen using your finger to select an object Double tap on a screen object to activate its associated function RFA300 Measurement Set 8VSB Service Manual 2 11 Operating Basics Home Window Menus Toolbar 2 12 The Home Window is the point of entry into the RFA300 measurement set From
173. roduct ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do Not Operate Without Covers Do not operate this product with covers or panels removed Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation Symbols and Terms Terms this Manual These terms may appear in this manual in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property WARNING Warning statements identify conditions or practices that could result RFA300 Measurement Set 8VSB Service Manual ix General Safety Summary Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately ac
174. rvice Manual 6 49 Maintenance 6 50 20 Click OK on the JamCursorControl ocx registration 21 Click on the RFA300 icon on the task bar to bring the finish dialog box to the front 22 Click Finish to complete the RFA 300 application installation The instru ment will restart Upgrade PR1 Use the following instructions to perform the PR1 upgrade installations of the RFA300 application software after you have installed the base application software 1 Turn on the RFA300 measurement set if not already in operation and wait for the power on procedure to finish The RFA300 application will start if the start up menu has not been changed from the factory setting 2 Exitthe RFA300 application File Exit if the application is running 3 Open the CD drive place the RFA300 Measurement Set 8VSB Application Software disc in the CD drive on the disk spindle and close the drive door 4 Select Run from the taskbar Start menu A Type d pr1 setup and press Enter the return key on a keyboard The upgrade welcome screen will appear Press Next on the upgrade welcome screen to continue the RFA300 setup Click Next again to begin copying files Click Finish to complete pass 1 of the setup lt FAS Click Finish to complete pass 2 of the RFA300 application installation The RFA300 measurement set will restart 10 Continue with the following installation procedure for PR2 Upgrade PR2 Use the following instructions
175. ssure the best operation of the range of channels Load the Performance performance verification software contains programs used for the perfor Verification Software mance verification and adjustment procedures Load the software using the following steps 1 Ifthe RFA300 application is running exit the application File Exit 2 Insert the RFA300 Performance Verification and Field Adjustment Software diskette into the floppy disk drive 3 Click on Start in the task bar In the Start menu select Run 4 a pv in the Open text box and press the OK button e5 A olx File Edit View Help 5 3 Floppy 3 Part2 bat E Tek bmp x xe 12 objectis 596KB A 5 When the TekOnly menu appears check Enable the Tek Only menu and then press the OK button RFA300 Measurement Set 8VSB Service Manual 4 21 Performance Verification Preparation for Testing 4 22 6 Open the RFA300 PV folder on the desktop Shortcut icons to the test programs are assembled in the folder for ease of accessing the test routines C WINDOWS DESKTOP RFASO0pv olx File Edit View Help a RFA300pv 7 lx ee xa 2s z 0 Bs Ll d gt a Hwui Knobtest Restore Touch Screen Configuration 5 object s 2 23KB Connect the RF input connector of the RFA300 measurement set to the 8VSB reference quality signal using a 50 2 coa
176. stallation upgrades PR1 and PR2 with the base application software for use in case the RFA300 application must be completely reinstalled The upgrade changes are not included as part of the base application installation The base application must be installed first and then the added releases are installed To install the RFA300 application software complete the following steps 1 FAA we PF YS omo omo om omo om om om onm CSCS 00 NBA Un A WH N SC Insert the CD ROM labeled RFA300 Measurement Set Application Software into the CD ROM drive Press the START front panel key and open the Run menu Type D dao30 setup exe and click OK Click Next to continue the DAO setup Click OK to complete the DAO setup Press the START front panel key again and reenter the Run menu Type D Vodbc30Nsetup exe and click OK Click Next to continue the ODBC setup Click Finish to complete the ODBC setup Press the START front panel key and open the Run menu D rfa300 setup exe and click OK Click Next to continue the RFA300 setup Select the typical setup and click Next to continue Click Next to begin copying files Click OK on the My T Touch license agreement Click OK on the default path for My T Touch Click OK to complete the My T Touch installation Click Finish at the completion of pass 1 The instrument will restart and continue the installation RFA300 Measurement Set 8VSB Se
177. sts of the Power Conditioning Board a purchased power supply the ac supply connector with line filter and the power supply cooling fan The Power Module supplies the PCI bus voltages through the backplane connectors that engage when the module is bolted in place Other voltages are provided to the mainframe modules through connectors and ribbon cables The power conditioning board distributes power from the main power supply to the backplane to the front panel and to the SCSI drive connector The 5 V and 12 V from the main supply are distributed through current limit circuitry Additional filter circuitry supplies clean voltages to the acquisition circuitry Dc to dc converters on the power conditioning circuit board generate six of the supplied voltages These voltages are the 7 5 V 7 5 V 43 3 V 15 V 15 V and 33 V supplies The power conditioning board also does the power on off switching generates the line trigger provides the fan drive voltage and drives the power supply status indication circuitry A shorted or overcurrent condition on any of the outputs of the main supply causes a shutdown and cycling of the main power supply The dc to dc converters foldback for an overcurrent condition and also shutdown the main supply for a shorted output PCI Backplane PCI backplane supports up to 10 standard PCI modules and accepts custom application modules The backplane interconnects the power supply output voltages to the
178. t 8VSB Service Manual Operating Basics Limits perform accurate measurements To select frequency perform the following procedure 1 Connect the instrument to your transmitter using the RF Connection information on page 2 2 Power on the instrument Click the Setup button on the toolbar Click on the System tab if the System page is not showing wa ROC Enter the desired frequency NOTE The frequency to enter is the pilot frequency not the channel center frequency Refer to Selecting channel frequency in the online help 6 Click on Apply then click on the Verify Input Signal Power button 7 Verify that the RF input signal level is in the OK range If the level is not OK adjust the output of your transmitter accordingly 8 Close the Input Signal Power dialog box and click OK to close the Instru ment Setup dialog box After selecting your channel frequency and checking input signal power you can edit caution and alarm limits Limits are a set of caution and alarm parameters The instrument compares each new result against the edited limits as soon as you enter the measurement window To edit limits do the following steps 1 Click the Setup button located in the toolbar 2 Click the Limits tab 3 Select the results that are to be compared against the limits when the measurement is running 4 Enter the low value for Alarm The value must be less than the low Caution value 5 Enter the low value
179. t Signal cable label 2 to J2 of the down converter module d Cable coupling connector between J0460 Tune voltage cable label 6 and J2 of the synthesizer module e J0480 86 MHz Clock to J4 Internal input of the down convertor module not connected J 0270 Clock cable label 7 to 1 of the Synthesizer module j 0480 86 MHz Clock internal to J 4 0440 cable label 2 Internal of the Down J 0271 Clock 2 to 2 of the Down Converter module not connected Converter module nem J 0340 J0271 d 400 Alarm J 0480 LPJ 0460 0440 connector 0580 EJ T n 0580 258 3 MHz J 0460 10 MHz Tune J 0340 Acquisition Clock cable label 4 to 4 Voltage cable label 6 cable label 0 to J 2 of RF Input 2 of the to 2 of the the Acquisition module Synthesizer module Synthesizer module Figure 6 4 Pilot lock module connector locations f J0580 258 3 MHz cable label 4 to the down converter module RF Input 2 Internal J4 6 Place the removed module on a static free work surface or in a static protection bag 6 14 RFA300 Measurement Set 8VSB Service Manual Maintenance E Removing the Synthesizer Remove the holding screws from the top and bottom of the synthesizer Module module rear panel The synthesizer module is a two circuit board assembly do not attempt to dismantle the assembly 2 Disconnect the following cable connectors between pilot lock modu
180. t Up The Microsoft P Network Shortcut to Neighborhood Knobtest exe me k ya d Inbox RFA 300 a Recycle Bin Mfg Cleanup SIE Figure 4 5 Windows95 main screen with cursors at various locations 4 10 RFA300 Measurement Set 8VSB Service Manual Performance Verification CD ROM and Stereo Port Tests 1 If the Start task bar is not present on the bottom of the screen press the Start button to display it Push the release button in the center of the CD drive drawer to release the drawer Pull the CD drive drawer open and insert a music CD disc on the center spindle Press down on the disc to snap it onto the spindle Close the CD drive drawer Wait approximately 15 seconds for tune Sounds to be played by the measurement set speaker NOTE If no music is heard check the speaker volume control setting Single click on the speaker on the speaker icon to display the speaker volume control Increase the volume control setting toward maximum up until you hear music from the measurement set speaker 10 With the mouse point to and double click on the speaker icon located at lower right hand corner of the screen In the Volume Control window set the CD Audio volume to minimum level using the mouse as follows a Click on CD Player then click on volume control b Position the cursor on the CD Audio volume control lever Click and hold down the mouse select button while
181. ted Display before replacing the flat panel display assembly After that use the following procedure to replace the display assembly 1 Position the flat panel display to permit the display assembly interconnection cable to be reconnected and connect it to the display connector on the front panel interface circuit board 2 Carefully slide the display assembly into the chassis to align it with the mounting screw holes 3 Install the six attaching screws two on the top two on the side and two on the bottom of the chassis RFA300 Measurement Set 8VSB Service Manual 6 19 Maintenance Removing the Key Pad After removing the front panel bezel and flat panel display assembly remove the Assembly front panel key pad assembly as follows 1 Remove the six screws holding the keypad assembly to the mainframe chassis There are two across the top two across the bottom and two on the right side of the assembly see Figure 6 9 a Figure 6 9 Key pad assembly removal 2 Disconnect the key pad interconnection cable from the front panel interface circuit board 3 Slide the key pad assembly out of the chassis Replacing the Key Pad 1 Position the key pad assembly to slide it into the chassis Assembl y Carefully slide the key pad assembly into place and align the mounting screws holes 6 20 RFA300
182. terface board controller connector 11 Connect the ribbon cable connector from the key pad assembly to the interface board 12 Reinstall the flat panel display module RFA300 Measurement Set 8VSB Service Manual 6 37 Maintenance Backplane Circuit remove the backplane the power supply and all of the plug in circuit boards Board Removal and must first be removed Replacement Remove the Backplane With the cabinet off the chassis use the following procedure to remove the backplane 1 Remove the power supply module see Power Supply Removal and Replacement on page 6 29 Remove all the plug in modules from the card cage see the RFA300 module removal instructions starting with Removing the Acquisition Module on page 6 12 Remove the 15 screws holding the backplane board assembly to the chassis with a T15 screw tip screwdriver see Figure 6 24 for the screw locations Lift the back plane board assembly out of the chassis Reinstall the Backplane Use the following procedure to reinstall the backplane circuit board into the platform card cage 1 6 38 Place the backplane board assembly into the mainframe chassis See Figure 6 24 for orientation of back plane to chassis Attach backplane board assembly to the chassis with fifteen T15 screws Torque the screws to 8 in lbs Reinstall the PCI plug in modules using their reinstallation instructions refer to Reinstalling an RFA300 PCI Module on page 6
183. ternal displays operate at the same resolution limited to 640x480 on current TFT LCD and display rates External Display Drive 1 SVGA XGA compatible analog output port Display Size user selected via Win95 NT display applet Resolution Pixels Colors DDC1 640x480 256 yes 640x480 64K yes 640x480 16 8M infinite colors no 800x600 256 colors yes 800x600 64K colors yes 1024X768 256 colors yes 1280X1024 256 colors yes Internal Display Classification Color LCD NEC TFT NL6448AC 33 24 Thin Film Transistor TFT 10 4 active matrix color LCD display whose intensity is controllable via software 1 10 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 4 Display system characteristics Cont Characteristic Internal Display Resolution and Area Description Color LCD NEC TFT NL6448AC 33 24 640 pixels horizontal by 480 pixels vertical 640X480 with 211 2 mm 8 3 by 158 4mm 6 2 of viewing area 10 4 diagonal Internal Display Color Scale Color LCD NEC TFT NL6448AC 33 24 Internal Display Viewing Angle Color LCD NEC TFT NL6448AC33 24 Contrast ratio of no more than 10 1 Horizontal 0x 80 degrees typical left right Vertical y 80 degrees typical upside downside Internal Display White Luminance bright ness and Uniformity Internal Display Contrast Ratio Internal Display Refresh Rates Color LCD NEC TFT NL6448AC33 24 L max 180 cd m
184. tion 7 8 In the Keyboard Test window select Yes a Ifthe Pass Completed Successfully message appears point to and select OK b Ifa failure occurred during the keyboard test refer the problem to a qualified service person Upon passing tests point to and select Cancel RS232 Tests Running this test disables the touch screen All menu selections must be done with the mouse Check the RS232 operation using the following steps 1 Connect an external loop back connector to the RS232 communications port located on the mainframe chassis See Figure 4 1 on page 4 3 for the wiring diagram of the loop back connector Use the mouse to point to and select COM With mouse select COM I Internal Data Path Test Internal Loopback Test COM 2 Internal Data Path Test Internal Loopback Test RTS CTS Ext Loopback Deselect all other boxes With mouse point to and select Run Tests Wait for the Test Results window to appear a Ifthe Pass complete message appears point to and select OK b Ifa failure message appears refer the problem to a qualified service person Upon passing tests point to and select Cancel box Exit QA Plus Select X in the upper right corner and then select Exit at the prompt Remove the loop back connector from the RS232 communication port RFA300 Measurement Set 8VSB Service Manual 4 19 Performance Verification Knob Test Check the front panel c
185. tments 10 MHz VCXO Frequency 5 8 Check First check the Fractional N synthesizer the 10 MHz VCXO frequency and the 86 1 MHz VCXO Make adjustments if needed Do the LO Low resonator adjustment first to center the LO Low resonator before doing the oscillator adjustments Prepare to make the oscillator checks and adjustments using the following procedure 1 Connect the RF input connector of the RFA300 measurement set to the spectrum analyzer 2 Setup the spectrum analyzer as follows a Center frequency to 400 MHz b Span to 50 kHz c Resolution BW to 500 Hz d Reference level to 30 dBm e Video BW to 500 Hz f Turnon the frequency counter 3 Exit the RFA300 measurement application if it is running 4 In the RFA300 PV folder double click the icon to run the hwui exe program 5 Select the Down Converter menu 6 Set the Input Atten to 0 dB The frequency accuracy of the 10 MHz VCXO determines the frequency accuracy of the synthesizer for those measurements that are not pilot locked Check the 10 MHz VCXO frequency as follows 1 Select the Synthesizer menu Set LO Frequency MHz to 400 000 Push Tune Src for Internal Verify that Ref Src is Internal Verify that all four lock indicators are checked RFA300 Measurement Set 8VSB Service Manual Adjustment Procedure 6 Measure the 400 000 MHz signal using the spectrum analyzer Note The signal amplitude is low usually about
186. to install the PR2 upgrade of the RFA300 application software after you have installed the base application software and the PR1 upgrade 1 Exit the RFA300 application File Exit if the application is running 2 Select Run from the taskbar Start menu 3 Type d pr2 setup and press Enter the return key on a keyboard The upgrade initialization screen will appear 4 Click Finish to complete the setup 5 Remove the RFA300 Application Software disc from the CD drive RFA300 Measurement Set 8VSB Service Manual Maintenance 6 Store the CD with the other backup software you received with your measurement set for use in case the application must be completely reinstalled Upgrade PR2 Default Limits The PR2 upgrade installs a new default limits set specifically the defaults limits for the EVM measurement are changed If you want to use these new default limits for all measurements do the following procedure to restore the new default limits set 1 2 3 4 5 Start up the RFA300 application Select Setup then Edit Setup and select the Limits tab Press the button labeled Restore Limits Select the Default Limits Press the button labeled Restore and then press OK Installing RFA300 To install the RFA300 hardware drivers complete the following steps Hardware Drivers 10 1 12 Open My Computer Control Panel and double click System Select the Device Manager tab and remove both PCI Card devi
187. tware Demodulation iiss 3 5 Down Converter hee Xe ede s 3 7 ACQUISIION ro PEDE HP P PERS HERES 3 8 SyDLlieSIZer uds snb E PERS pP e t eer e eid iere E 3 9 Pilot LOCK iioi e Re REL HC REPRE REL PPP 3 10 Test SO DWAte tod senes wor ERE MESE EUREN E SES 4 1 ere pee dee pale x a eve ane wa maine 4 1 PrerequisHfes ss rasanan enie ea ps dae ale ge epe RES 4 1 Equipment Required n ns metra rr ER ER 4 2 REA300 Test Record nd eee rh reet rale mer ev pe ER wads 4 4 Measurement Set Power On 0 0c eee eee tenes 4 5 Functional Verification Procedure 2 0 cee eee eee eee 4 7 Extended Diagnostics E IE EE BENT TES 4 7 Verify Input Signal Power 2 enert Rer Rt rk Rr Rink 4 8 Measurement Functionality 0 0 eee eee 4 9 Touch Screen lest e eh ERU Ee er ev pe ER ES 4 9 CD and Stereo Port Tests scence comeron ne eee paek e raina 4 11 Selection Booting of QAPlus WIN WIN Program 4 12 RFA300 Measurement Set 8VSB Service Manual Table of Contents System Board Tests 2 sececse s ck t eR ECRIRE Ud RE LCD Display Polarizer and Dust Contamination Checks LCD Display R ed Green Blue Pixel Checks
188. ue S max Magnitude of the real in phase part of the vector to the outermost state of the constellation EVM can also be expressed in terms of dB where EVMdB 20 l0g 100 EVM Note that the ratio in intentionally inverted to make the value in dB positive 12 of the correct reading When S N 25 dB with high smoothing lt 1 Residual EVM is created within the RFA300 measurement set RFA300 Measurement Set 8VSB Service Manual 1 5 Specifications Table 1 2 Measurement specifications Cont Characteristic Description Complex MER Modulation Error Ratio Complex Modulation Error Ratio Complex MER is a complex form of the S N measurement that is made by including Q quadrature channel information in the ideal and error signal power computations similar to EVM MER is defined by the following formula N 02 MER 20106 gt 012 Where Modulation error ratio Ij and Qj Ideal I channel and Q channel symbols ol and 50 Errors between received and ideal I channel and Q channel symbols MER Accuracy 1 dB ofthe correct reading When S N 25 dB with high smoothing Residual MER z 40 dB Residual MER is created within the RFA300 RFA300 measurement set Pilot Amplitude Deviation 0 1dB 0 2 x deviation reading dB When S N 25 dB with high smoothing 1 6 RFA300 Measurement Set 8VSB Service Manual Specifications Table 1 2 Measurement specifications Cont C
189. velocity dry air to blow away dust or lint If air alone does not remove all of the dust and lint use a soft brush to complete the task Exercise extreme care not to disturb components on the plug in circuit boards during cleaning RFA300 Measurement Set 8VSB Service Manual Maintenance CAUTION This instrument contains static sensitive devices that can be damaged by static discharge Wear a wrist grounding strap when working on or with modules inside the mainframe cabinet In Case of Problems This section addresses problems that you may encounter while using the RFA300 measurement set This section does not identify specific problems relating to performance verification or adjustments For information on performance verification procedures or adjustment procedures refer to those sections of this manual Diagnostics The following diagnostic tools are available with your RFA300 measurement set M Power on diagnostics These diagnostics run when you first power on the instrument or when you first start the measurement set application If any diagnostic failures occur during power on the Power On Diagnostics dialog box appears m Extended diagnostics These diagnostics test the instrument more thoroughly than the power on diagnostics You can use the extended diagnostics to isolate problems down to an individual module The extended diagnostics are part of the measurement set application To run extended diagnostics go to the T
190. w PPP 2 14 UBL NEUTER c eccL 2 15 Viewing Results see e achete a e ug We mre Re det Abus cb 2 15 saving Results 2 5 RE eia hibet obra ede 2 15 Signal sais E XR ses dies eke es EGER eke 2 15 Online Help 05404253 44 ood te phe ER Are ets 2 17 TOPICS nord Geet ee adh apo bas Set A eee eel oe Sta eens Rd 2 17 Whats Dis x sehen ceti re reb ne a bck Gane ace e 2 17 Windows 95 Online Help e m md 2 18 Release NOIES 2 18 Backing Up Piles eaten see eed Me IEEE EU gonial s Re saad es 2 18 Mainframe Operation ever bee ee ese ee 3 1 System BUSSES v see RR x RHENO IRE Gow ae 3 1 Power Supply i rem R9 x ERE TR RN s 3 3 PCT Backplane 22292 pb teed ebay danke UHR VER VR Ys 3 3 Mainframe Controller crece bee er e e es 3 3 Front Panel Interface ve ep eR VER VERS 3 3 LCD Flat Panel Display m rem yes 3 3 Touch Panel RR RR RU Ode ees Qe RR UHR VER VPE EY 3 4 Hard Disk Drive REG E Yee es 3 4 Floppy Disk sem emm meme rune ees 3 4 CD DIVE Lo ep RE RED IOR Y e RR ERU eG Rep E VOR Pee ewe 3 4 Mouse and Keyboard Ports 2 2 2 5 944 3 4 RFA300 Measurement Set Functional Description 3 4 Simplified Block Description irieis tined eA 3 4 Sof
191. with the maximum protection Figure 6 26 shows how to repackage the measurement set for shipment As the figure shows it is not necessary to have the accessories received with the RFA300 in the package for reshipment to repair If you are shipping to another site for reinstallation the accessories are packed last in accessory trays at the top of the box The inner shipping box pads and protective bag provide the necessary protection to allow the shipping materials of the outer shipping box to correctly support the product for shipment Pack the inner shipping box as follows 1 If you have the original packaging material start by placing one of the spacer pads in the bottom of the inner box Position the side of the pad with the smaller square holes against the side of the box as shown in Figure 6 25 lt lt gt gt lt Bottom spacer pad 1 2 of 004 4925 00 Outside edge of box gt lt Spacer pad positioned inside the bottom of the box Figure 6 25 Placement of bottom spacer pad in inner shipping box 6 56 RFA300 Measurement Set 8VSB Service Manual Maintenance 2 Remove the optional accessory pouch if installed and place the protective front cover on the front of the measurement set 3 Place the RFA300 in the protective bag The bag prevents dust moisture or other small packaging debris from entering the cabinet 4 Fold the top of the ba
192. xial cable with N type connectors or the appropriate adapters on both ends The signal power applied to the RFA300 measurement set must be in the range of 10 mW to 2 10 dBm to 33 dBm for correct operation Start the RFA300 application and wait for the application to finish initial izing From the Home window click the Setup button on the toolbar Select the System tab NOTE Refer to Selecting channel frequency in the RFA300 online help for the channel pilot frequencies Enter the channel pilot frequency of the reference 8VSB signal connected to the RF input connector of the measurement set Click on the Verify Input Signal Power button Verify that the input signal level is in the OK range in the green Close the dialog box and click OK to close the Instrument Setup dialog box NOTE Make a copy of the RFA300 Test Record form on page 4 4 and use it to record the test results for the performance verification procedure RFA300 Measurement Set 8VSB Service Manual Performance Verification Test Procedure 1 From the Home window click on the Signal Noise Error Vector Magnitude Pilot Amplitude Error icon In the toolbar set Smoothing to High Check Signal Noise is greater than 40 dB Check EVM is less than 1 Check Complex MER is greater than 40 dB A wu RO m From the Home window click on the Frequency Response Group Delay icon 7 Inthe toolbar note the current Smoothing selection the
193. xvi Tektronix provides service to cover repair under warranty Other services are available that may provide a cost effective answer to your service needs Whether providing warranty repair service or any of the other services listed below Tektronix service technicians trained on Tektronix products are best equipped to service your RFA300 measurement set system Tektronix technicians are appraised of the latest information on improvements to the product as well as the latest product options Tektronix warrants this product for one year from the date of purchase The watranty appears after the title page and copyright page in this manual Tektronix technicians provide warranty service at most Tektronix service locations worldwide Your Tektronix product catalog lists all service locations worldwide Tektronix offers single per incident and annual maintenance agreements that provide Depot Service repair of this product Of these services the annual maintenance agreement offers a particularly cost effective approach to service for many owners of the RFA300 Measurement Set 8VSB Such agreements can be purchased to span several years Tektronix supports repair to the module level by offering a Module Exchange program Module Exchange This service reduces down time for repair by allowing you to exchange most modules for remanufactured ones Tektronix ships you an updated and tested exchange module from the Beaverton Oregon service center
194. y up to gain access to the interconnection cable release catches 4 Disconnect the interconnection cables from the controller board by releasing the catches or both ends of the connector RFA300 Measurement Set 8VSB Service Manual 6 33 Maintenance a CD drive b Interface board c Hard disk drive Reinstall the Controller Board Use the following procedure to reinstall the controller circuit board 1 Position the controller board in the card cage Refer to Figure 6 20 for orientation of controller board to back plane assembly 2 Reconnect the cable connectors to the Front Panel interface board the CD ROM drive and the hard disk drive see Figure 6 21 for connector locations a Align the connector pin carefully and then press down firmly to seat the connector b Ensure that the connector catches on both ends of the connector are fully closed Controller board partial Front of instrument Figure 6 21 Controller board connectors 3 Align the controller board edge connectors with the PCI slot connectors and press down firmly to seat the controller board in the connectors 6 34 RFA300 Measurement Set 8VSB Service Manual Maintenance 4 Attach the controller board and the attached I O board brackets to the mainframe chassis with four T15 screws Torque the screws to 8 in lbs Interface Board Removal Use the

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