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RFA300A Measurement Set 8VSB Service Manual

1. 1 W 30 dBmMax Ext RF Ext RF Input 7a Input 2 9 Down Converter Module Acquisition Module 15to17dB 10 7 MHz 10 cB m 0 5 cB steps 30 kHz BW 10 cB sw Narrow BW Select gt RZ Full scale 5w Lo 0 60 cB A CX 19Vpp Ed 100 MHz 12 cB 4 RAM 512 kB Nr a m y PreNarow 0 98 9 AD TUNE JU RAM XxX j RR BandGain 15to17 dB 60 250 ie Wie 0 5 dB steps Hz nput RF M gt AX 7 4 Select Attenuator gt LO A z Prset 708 1Vpps 50 Broad Band Gain Address 9dB Decoder 14 Pilot 40 76 MHz Toverious circuit 1076 frequency CW O 5 gt cortrols 250 EBW 50 RF Input 2 Supplies fy 12 cB PCI Transceivers 5OOhmintemel ic h 10 20 btt Pilot gt isi TOME i Precision N dd MHz MHz Power Interface 2 Interface Y signel e 13 dBmMex 4 LOSignal ToP Fjza Interface sow E 3 Q LOSig 2 Synthesizer Module Pilot Lock Module m 1 ex 39 30B RF Modue 1200 Signal Pilot nae A Control Preset Signal cator a 27 10 MHz Pilot Loop r gt Pilot Lock Detect T Frequency DIA Freq 10 MHz Tune gain lt Synth Pilot Lock 4 Tune 1 signal Band J 0420 J 0460 gt E Lum ne
2. i Keyboard CDT Mouse RS 232 RF COM Portl Connections Figure 2 2 Rear view 2 4 RFA300A Measurement Set 8VSB Service Manual Getting Started Keyboard and Mouse Connect the keyboard and mouse to the left side of the instrument as shown in Connections Figure 2 3 060600000 0500050506909 990 o 9090 995 808 Earphones Not used USB Keyboard Mouse Figure 2 3 Keyboard and mouse connections RFA300A Measurement Set 8VSB Service Manual Getting Started Powering On and Off 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 6 First Time Power On Power on the RFA300A 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 300A Measurement Set 8VSB
3. Speaker a Figure 6 18 Speaker installation Interface Board Removal Use the following procedure to remove the interface board and Replacement 1 Disconnect the speaker wire from the interface board J980 connector see Figure 6 19 2 Disconnect the right side fan wire from the interface board J420 right FAN connector 3 Disconnect the left side fan wire from the interface board J410 left FAN connector 6 32 RFA300A Measurement Set 8VSB Service Manual Maintenance 4 Disconnect the floppy disk drive flexible circuit board from the interface board a Release the locking latch on the flexible circuit board connector ao bar b Pull the flexible circuit board straight out of the connector Power supply Fan Keypad gt Floppy assembly disk drive CD Stereo Display Controller 1 0 Speaker Figure 6 19 Front panel interface circuit board connectors 5 Disconnect the CD stereo cable 6 Disconnect the controller I O ribbon cable from the interface board 7 Disconnect the power supply cable RFA300A Measurement Set 8VSB Service Manual 6 33 Maintenance 6 34 Disconnect the key pad assembly ribbon cabl
4. ESPAGNE CEDE Cd qe puc e I my Mainframe RS232 Ethernet USB USB Keyboard computer ja fod l Mouse aa On Stby Switch cD Speaker Hard Fans drives Display module aan aie Rath ECB Applications module Possible rear panel connectors Power module ECB Applications Possible rear panel connectors Power module supply Possible coaxial connection between all ECB modules ECB Applications module Possible rear panel connectors System 11 back plane gt Applications l modules ECB Applications module Possible rear panel connectors mE Possible rear ignal Application panel connectors Interface ECB Possible coaxial connection 1 d 2 to all ECB modules lt gt Full system bus lt At least control and power Figure 3 1 Platform block diagram Digitizer S ource applications module Front rear panel connectors RFA300A Measurement Set 8VSB Service Manual Theory of Operation Power Supply Power Module consists 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 t
5. Mechanical Physical Characteristics ACCES SOTIE S s eec PORE eo PRU ILES ot ROUTIER En EN ET RU Getting Started Installation 5 ceste Pa oie tye de eee Mas Powerin On and Off fae tees ee s Operating Basics esis eene Ee e ERES a s Front erp E SEHE Bart Home Window Making a Measurement Online Help 2 Deren bU E EE EM Backing Up Files scene we oot ea ee rats Theory of Mainframe Operation RFA300A Measurement Set Functional Description RFA300A Measurement Set 8VSB Service Manual xiii xiv xiv xiv XV XV XV xvi Table of Contents Performance Verification Performance Verification 4 1 Test SOIL Wale t oM teu EN A C NAE Nese atau 4 Test Interval 255 4 1 Prerequisites USER MS Re MERLE EAT Rat 4 1 Equipment Required eee ye GU RAUS LR RR 4 2 RFA300A Test Record 4 4 Measurement Set Power On
6. On Stby switch Figure 2 4 On Standby switch 2 Wait for the instrument to complete power on self tests The internal setup software automatically configures your instrument and installs all required devices After the setup software completes configura tion the RFA300A measurement set application will start The next time you power on the application starts automatically Powering off To power off the instrument press the On Standby switch NOTE 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 2 6 RFA300A Measurement Set 8VSB Service Manual Operating Basics This section describes the basic operation of the RFA300A Measurement Set 8VSB For operating details refer to the online help The RFA300A measurement set is built into a mainframe called the platform that uses Windows NT as its operating system The RFA300A Measurement Set 8VSB makes measurements that are used to determine the quality of a trans mitted 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
7. 1 9 Table 1 4 Front panel interface characteristics 1 10 Table 1 5 Rear panel interface characteristics 1 11 Table 1 6 AC power source characteristics 1 13 Table 1 7 Environmental characteristics 1 14 Table 1 8 Dynamics 1 15 Table 1 9 Transportation 1 15 Table 1 10 Certifications and compliances 1 16 Table 1 11 Mechanical characteristics 1 18 Table 1 12 Standard accessories 1 19 Table 1 13 Optional accessories 1 19 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 14 Table 4 1 Required equipment list 4 2 Table 5 1 Required equipment list Le 5 1 Table 6 1 Static susceptibility 6 1 Table 6 2 Troubleshooting 6 6 Table 6 3 Packaging material 6 60 Table 7 1 Optional accessories 7 1 RFA300A Measurement Set 8VSB Service Manual vii Table of Contents vi
8. S N 20 log 1 M Where S N Signal to Noise Power Ratio in dB Ij Ideal received I channel signal 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 z40dB The amount of S N thatis created within the RFA300A RFA300A measurement set 1 4 RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 2 Measurement specifications Cont Characteristic Description EVM Error vector magnitude 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 its ideal value EVM is often expressed as a percent Error Vector Magnitude EVM is defined by the following formula EVM es x 100 Where Error Vector Magnitude 96 The error in the real axis received signal value 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 log 100 EVM Note that the ratio is intentionally inverted to make the value in dB positive EVM Accuracy 12 of the correct reading When S N 25 dB with high smoothing Residual
9. 4 5 Functional Verification Procedure 4 7 Touch Screen Test 2 E ERR RR hd DR SE RS 4 10 CD ROM and Stereo Port Tests 4 10 RFA300A Operational 4 12 LO LOW Resonator Check 4 16 Fractional N Synthesizer Check 4 17 Input Return Loss Check 4 20 Out of Channel Measurement Limits 4 22 Out of Channel Accuracy 4 23 Restore Data Files 4 26 Measurement Set Shut 4 27 Adjustment Procedures Maintenance Adjustment Procedures 5 1 Equipment Required 5 1 Normalize the RFA300A 5 2 LO Low Resonator Check and Adjustment 5 4 Fractional N Synthesizer Adjustment 5 8 Calibrate the Touch Screen 5 11 Restore Data Files soiig DR RR EURO EN EAR UR Ra 5 11 Maintenance 6 1 Preparations boe pev SI e 6 1 Handling Static Sensi
10. 2 14 Limits Versus Masks Limits 7 Enter the desired frequency NOTE The frequency is the pilot frequency not channel center Refer to Selecting channel frequency in the online help 8 Click Apply and then click the Input Signal Power button 9 Check to see if the RF input signal level is in the OK range if it is not then adjust the output of your transmitter accordingly 10 Close the Input Signal Power dialog box and click OK to close the System Setup window Before proceeding you should understand the differences between limits and masks Limits are parameters against which numeric measurement results can be compared automatically You can choose the color to highlight results that violate parameters The mask testing feature allows you to set visual parameters within the graphic portion of the measurement window The masks are lines against which you can compare waveforms After selecting your channel frequency and checking input signal power you can edit caution and alarm limits The instrument compares each new result against the current limits as soon as you enter the measurement window To edit limits do the following 1 Click the Setup button located in the toolbar 2 Click the Limits tab 3 Select which results 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
11. Characteristic Description Classification Transportable platform intended for design and development bench lab based applications Overall Dimensions Height without feet 8 9 inches 22 6 cm Width 16 75 inches 42 5 cm Depth 21 5 inches 54 6 cm Weight RFA300A 4 Ib 18 6 kg Shipping Weight 60 Ib 27 2 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 18 RFA300A Measurement Set 8VSB Service Manual Specifications Accessories Tables 1 12 and 1 13 lists the standard and optional accessories Table 1 12 Standard accessories Description RFA300A Measurement Set 8VSB User Manual RFA300A Measurement Set 8VSB OS and Application S oftware on CD ROM WINNT keyboard US Tektronix three button mouse Standard IEC power cord Front protective cover 10 dB Attenuator Table 1 13 Optional accessories Description Accessory pouch Power cord options Opt A1 Universal Euro 220 V 50 Hz Opt A4 North America 240 V 60 Hz Rackmount kit w instructions Option D1 Calibration certificate RFA300A Measurement Set 8VSB Service Manual with Performance Procedure and Adjustment Procedure software disk RFA300A Measurement Set 8VSB Service Manual Quantity lea lea lea lea lea lea lea Quantity lea lea lea lea lea lea lea
12. Shielded Shielded PCI Card PCI Card Frequency Phase Lock e O lt Pilot Lock Dividers 1 22 Synthesizer Pilot Lock Mainframe 5 Module Mainframe Interface Module interface CR MURS M Er 5 a EE EE EE EE A i Mainframe Platform Figure 3 2 Simplified block diagram of the RFA300A RFA300A Measurement Set 8VSB Service Manual 3 5 Theory of Operation Software Demodulation 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 0 Hertz The signal is then passed through an idealized 8VSB receiver bandpass filter in the complex frequency domain taking into account any small errors caused by the measurement set 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 that are needed to minimize intersymbol errors Part of this process generates an idealized signal that
13. 2 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 3 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 4 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 5 Replace the mouse ball and retaining ring Rotate the retaining ring clockwise opposite direction to the arrows until the ring locks into place 6 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 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 Examine the interior of the mainframe for dust build up If the interior needs cleaning use low 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 Be extremely careful not to disturb components on
14. 4 Apply firm pressure to completely seat the module in the connectors 5 Replace the module holding screws to hold the module in the card cage RFA300A Measurement Set 8VSB Service Manual 6 19 Maintenance Mainframe 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 The 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 9 Front Penel Interface board Disconnect from Front Panel Interface circuit board Figure 6 9 Flat panel display removal 6 20 RFA300A Measurement Set 8VSB Service Manual Maintenance 3 Pull the display assembly away from the chassis to expose the connector to the front panel interface circuit board see Figure 6 0 4 Disconnect
15. Maintenance Install Windows NT sure the RFA300A System and Application Restore Media CD ROM is in Service Pack5 the CD ROM drive 1 From the Start menu run e SP5 sp51386 exe 2 Follow the Windows NT installation instructions Do not override the E100B SYS 3 Remove the CD ROM from the drive and restart the system when installa tion is completed Install Database and Make sure that the RFA300A System and Application Restore Media CD ROM is RFA300A Measurement in the CD ROM drive Set 8VSB Software 1 Install ODBC30 by running e ODBC30 Setup exe from the Start menu 2 Install DAO30 by running e DAO30Setup exe from the Start menu 3 Install the RFA300A Measurement Set 8VSB software as follows a b c 6 58 From the Start menu run e RFA300A Setup exe Click Next Select Typical setup type Click Next Click OK to acknowledge the comct132 dll update Click Finish for the pass 1 setup Remove the CD ROM from the drive to let the system boot from the hard drive As soon as the NT boot starts from the hard drive reinsert the CD ROM into the drive The system completes the NT boot from the hard drive and then uses the CD ROM for pass 2 of the setup When you are prompted to finish remove the CD ROM from the drive and click to restart the system The RFA300A Measurement Set 8VSB will be available for use after the restart RFA300A Measurement Set 8VSB Serv
16. At the rear of the power supply remove two short screws and two long T15 screws Backplane connectors Backplane ribbon cable Front panel ribbon cable Long T15 screws 2 pi nai ga Screws 4 Ap 2 Figure 6 22 Power supply long and short screw locations 6 36 RFA300A Measurement Set 8VSB Service Manual Maintenance 5 Disconnect the backplane ribbon cable from the side of the power supply module 6 Release the connector latches on the wide ribbon cable housing and disconnect the front panel ribbon cable from the front of the power supply module 7 Slide the power supply module out of the chassis Use a flat blade screw driver as a lever if needed 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 22 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 At the 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 attac
17. Circuit board retaining plate Figure 6 3 Circuit board retaining plate 2 Remove the holding screws from the top and bottom of the acquisition module at the rear panel 3 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 4 When the module is loose from the connector lift the module up to gain access to the interconnections cables RFA300A Measurement Set 8VSB Service Manual 6 13 Maintenance 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 4 cable label 1 to J 1 of the Down Converter module 8 cable label 0 to the cable coupling of the cable to 0340 of the Pilot Lock module Disconnect the following interconnection cables from the acquisition module see Figure 6 4 for connector locations a J4toJ1 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 Figure 6 4 Acquisition module connector locations R
18. 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 External Input Enable 1 NarrowB and Enable 0 NarrowB and Pad Enable 0 NarrowB and Atten 15 5 j 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 34 20 180 MHz 101 20 200 MHz 108 Cancel Figure 5 3 Hardware Settings window in Hwui screen RFA300A Measurement Set 8VSB Service Manual 5 7 Adjustment Procedure Fractional N Synthesizer Adjustment First check the Fractional N synthesizer the 10 MHz VCXO frequency and the 86 1 MHz VCXO Make adjustments if needed
19. Figure 6 7 Synthesizer module connector locations 6 17 Figure 6 8 Connector locations on the down converter module 6 18 Figure 6 9 Flat panel display 6 20 Figure 6 10 Key pad assembly 6 22 Figure 6 11 Front panel interface circuit board connectors 6 23 Figure 6 12 Chassis screw locations for the CD drive 6 25 Figure 6 13 Chassis screw locations for the floppy disk drive 6 25 Figure 6 14 Connecting the Floppy disk and CD ROM drive assembly cables a so RR Ere a partite Es 6 27 Figure 6 15 Bracket screw locations for hard disk drive 6 28 Figure 6 16 Hard drive ribbon cable orientation 6 29 Figure 6 17 Hard drive installation with controller cable CODD CLOIS 22 24 SE QE QA SEPA 6 30 Figure 6 18 Speaker installation 6 32 Figure 6 19 Front panel interface circuit board connectors 6 33 Figure 6 20 Screw locations for the interface circuit board 6 34 Figure 6 21 Cut away view showing wire routing of fan and Speaker WALES cv ede nue cies stein mri een Rib S e LS we 6 35 Figure 6 22 Power supply long and short screw locations 6 36 Figure 6 23 Controller board orientation and screw locations 6 39 Figure 6 24 IDE hard drive ribbon cable connects to the I O board ECCE 6 41 Figure
20. Part number 071 0697 XX 063 3410 XX 119 6216 XX 119 4330 XX 161 0230 XX 200 4408 XX 119 6328 00 Part number 016 1441 XX 161 0104 07 161 0104 08 016 1691 XX 071 0698 XX 063 3411 XX 1 19 Specifications 1 20 RFA300A Measurement Set 8VSB Service Manual Getting Started Installation Hardware Installation A A Getting Started tells technicians how to install and operate the product There is information about the physical instrument and introductory information about how to operate it Operating Basics beginning on page 2 7 provides a conceptual overview of how the measurement set works Read this section before beginning any installation procedures This section deals with hardware installation and includes site considerations power requirements and ground connections for your instrument 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 any of the 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 th
21. Replacing the Key Pad Assembl y Carefully slide the key pad assembly into place and align the mounting screw holes 3 Connect the key pad assembly interconnection ribbon cable to the key pad connector on the front panel interface circuit board see Figure 6 11 4 Install the six attaching screws 6 22 RFA300A Measurement Set 8VSB Service Manual Maintenance Power supply F Keypad gt an eypa lt Floppy disk drive CD Stereo gt Display CPU Speaker Figure 6 11 Front panel interface circuit board connectors Removing the CD and You must remove the cabinet front bezel and key pad assembly before Floppy Disk Drive removing the CD and disk drive assembly Remove the flat panel display Assembly assembly only if you need to change the floppy disk drive interconnection cable or the CD audio cable To remove the CD ROM and Floppy Disk drive assembly proceed as follows 1 Remove the mainframe cabinet see Removing the Cabinet on page 6 9 for the removal procedure 2 Remove the front panel bezel refer to Removing the Bezel Trim Ring on page 6 9 for the removal procedure 3 Remove the display assembly refer to Removing the Flat Panel Display on page 6 20 for the removal pr
22. The instrument Utilities may be set up to disable hard power off Check the setting of the instrument Utilities the instrument Utilities are located in the Windows Control Panel The Windows operating system may have a problem Try powering off the instrument using the Windows shutdown procedure If the instrument still does not power off rebootpdfjennie the instrument by disconnecting the power cord and reconnecting it after 10 seconds RFA300A Measurement Set 8VSB Service Manual Maintenance Checking the Power Supply Module The field service check of the power supply consists 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 Stby button to turn on the measurement set Check that the measurement set powers up 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 36 and exchange it with a known good power supply RFA300A Measurement Set 8VSB Service Manual 6 7 Ma
23. _ Sw 10 MHz SIT vcxo OU yl Alarm uL 90 Tune Volts 5 ng Source 5 1076 Clock 4 Y Digitizer 483 05 MHz 10 Q MHz x BW Digitizer mE Clock 4 Wide Clock Synthesizer 5 M J 0260 10 76 MHz Oe Bh 10270 Clock 2 Narrow 258 MHz gt Synthesizer 43 05 MHz Clock Intemal via ES To various circuit ES Power Interface controls Power Interface s Symbol Lock Hook 14 FI PCI amp 12 Power CI face X9 JO480 control Interface control 2 86 MHz Ref Freq D A Clock Bus Interface Bus Interface Intemal 86 097 902 MHz 240 Hz Figure 9 1 RFA300A Measurement Set 8VSB block diagram RFA300A Measurement Set 8VSB Service Manual Front Panel Interface 258 MHz Clk Power Supply Figure 9 2 Interconnection block diagram IF Signal Pilot Signal 10MHz Ture Volts 10 76 MHz Clk 124 Slots 4 amp 5 43 05 MHz Clk 14 Acquisition Floppy Drive Keypad Assembly Fan Fan HEADPHONES Flat Panel Display MOUSE KEYBOARD Audio FP USB PARALLEL vO CDROM ETHERNET Controller SVGA RS232 HD Disk RS232 EMI Filter Drive J10 Ji
24. film side down 6 62 RFA300A Measurement Set 8VSB Service Manual Maintenance 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 the 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 M A Note The keyboard mouse and manual boxes do not need to be returned with the RFA300A measurement set for servicing Figure 6 34 Repackaging the RFA300A measurement set RFA300A Measurement Set 8VSB Service Manual 6 63 Maintenance 6 64 RFA300A Measurement Set 8VSB Service Manual EE Oe Options The optional accessories for the RFA300A Measurement Set 8VSB are shown on page 1 13 RFA300A Measurement Set 8VSB Service Manual 7 1 7 2 RFA300A Measurement Set 8VSB Service Manual E R Replaceable Electrical Parts The replaceable electrical parts are the replaceable plugin modules and the circuit board assemblies Those parts along with the interconnection cables r
25. 1 procedure on page 6 52 Partition 2 will be preserved in most cases NOTE You typically do not need to use this procedure the Easy Restore procedures are normally sufficient to restore Partitions 1 and 2 To create Partition 2 perform the following steps 1 From the Start menu select Program Administrative Tools and then Disk Administrator Click CD ROM From the Tools menu select Assign Drive Letter Select E for the CD ROM Uus tun Click the unpartitioned space on disk 1 CAUTION It is important to select Create Extended in the following step 6 From the Partition menu select Create Extended to create an extended partition Use all of the remaining free space 7 From the Partition menu select Commit Change Now 8 Click within the partition that you just created 9 From the Partition menu select Create to create a logical drive Use all of the free space Assign drive letter D if needed 10 From the Partition menu select Commit Change Now 11 From the Tools menu select Format the new partition Format it with the NTFS file system RFA300A Measurement Set 8VSB Service Manual 6 53 Maintenance Install and Configure Individual Components Install ESS Technology ES1869 Sound Chip Driver Install Chip and Technology 69000 Display 6 54 Driver If a component is malfunctioning reinstall or reconfigure the driver or software individually This may save you from h
26. 22 RFA300A Measurement Set 8VSB Service Manual Performance Verification 7 Set up 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 Set the output power of the CW signal generator at 7 dBm 9 Use a 6 GB 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 RFA300A measurement set as shown in Figure 4 8 FM signal generator RFA300A Analyzer Rear panel RF input connector 50 coaxial cable CW Signal generator 50 coaxial cable S plitter C ombiner 50 coaxial cable Figure 4 8 Out of channel accuracy test setup 11 Start the Out of Channel measurement NOTE This test uses the setup for the Out of Channel Power to Average Power to run the check for accuracy Since there is only a single test signal frequency within the band the average power in the band is much lower than would be expected with a true 8 VSB signal You will usually see an Out of Channel to Average Power failure indicated The test may sometimes report a pass but that is not to be expected RFA300A Measurement Set 8VSB Service Manual 4 23 Performance Verification 12 Place a cursor on the peak of the second RF signal
27. Controller Board Use the following procedure to reinstall the controller circuit board 1 Position the controller board in the card bay in the appropriate slot as shown in Figure 9 2 CAUTION While handling and installing the controller board do not press on the memory SIMMs single inline memory modules 6 38 Lower the controller board into the mainframe while dressing the I O board to controller board cables away from the slot position Align the controller board edge connectors with the backplane slot connec tors and press down firmly on the top edge of the circuit board to seat the controller board in the backplane connectors RFA300A Measurement Set 8VSB Service Manual Maintenance 4 Attach the controller board bracket to the mainframe chassis with two T15 screws see Figure 6 23 Torque the screws to 8 in lbs T15 screws Figure 6 23 Controller board orientation and screw locations 5 Reconnect the I O board to controller board cables Refer to Connect I O board to Controller board on page 6 44 for the connection sequence 6 39 RFA300A Measurement Set 8VSB Service Manual Maintenance Board Removal and 6 40 Replacement The I O board has many interconnection cables to the controller board that must be disconnected for removal After removing the cabinet and circuit board retaining plate use the following procedure to remove the I O circuit b
28. EVM lt 1 Residual EVM is created within RFA300A RFA300A measurement set RFA300A Measurement Set 8VSB Service Manual 1 5 Specifications Table 1 2 Measurement specifications Cont Characteristic Complex MER Modulation Error Ratio Description 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 j l MER 20log N gt 47 Where MER Modulation error ratio I and Qj Ideal I channel and Q channel symbols OI and 6Qj Errors between received and ideal I channel and Q channel symbols MER Accuracy Residual MER Pilot Amplitude Deviation 1 6 1 dB ofthe correct reading When S N 25 dB with high smoothing z 40 dB Residual MER is created within the RFA300A RFA300A measurement set 0 1dB 0 2 x deviation reading dB When S N 25 dB with high smoothing RFA300A Measurement Set SVSB Service Manual Specifications Table 1 2 Measurement specifications Cont Characteristic Out of Channel Emissions Measurement Limit Outof Channel Accuracy Upper Lower Channel P ower Accuracy Transmitter Frequency Response Error Frequency range Display accuracy Residual Flatness Error Transmitter Group Delay Frequency Range Descri
29. 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 provide 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 RFA300A Measurement Set 8VSB Service Manual 3 11 Theory of Operation 3 12 RFA300A Measurement Set 8VSB Service Manual 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 does not 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 NT operating system and the RFA300A Measurement Set VSB application For detailed operating instructions refer to the Windows NT manuals and the RFA300 Measurement Set 8VSB User Manual The Performance Verification and Adjustment procedures use testing software containing special testing applications This software is provided on a floppy disk as an accessory to this service manual The software saves the user setup fi
30. Q coaxial cable with N type connectors or the appropriate adapters on both ends The signal power applied to the RFA300A measurement set must be in the range of 10 mW to 1 W 10 dBm to 30 dBm for correct operation Connect a mouse and a keyboard to the appropriate connector on the left hand side of the measurement set Turn on the measurement set 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 RFA300A application is running exit the application File Exit b Insert the PVFA diskette into the floppy disk drive c Open My Computer then open 31 2 Floppy d Double click on the PV icon The RFA300A PV Installation screen is displayed e In the RFA300A PV Adjust Installation window click GO to load the performance verification software f When the RFA300A 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 RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure 5 Open the RFA300A 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 VWINDIWS DESKT
31. There are three snaps across the top and three across the bottom that hold the bezel to the cabinet Replace the front panel bezel as follows 1 If the light pipes are out replace them now insert the light pipes in the light pipe holes and turn them clockwise until they snap into place Position the bezel trim ring over the front of the cabinet and engage the three snaps across the top of the cabinet After you have engaged the snaps across the top firmly press the bottom of the bezel onto the cabinet to engage the snaps across the bottom of the bezel Press on the top of the bezel again to make sure the top snaps are all completely engaged Using smooth jaw pliers to hold the key cap position the On Stby key cap on the switch shaft Push straight in on the key cap to press it onto the switch shaft The plug in modules are located in the mainframe card cage The down converter module is located in the mainframe bottom compartment in a separate shielded chassis subassembly NOTE There are many cables and connectors to disconnect and reconnect to remove and replace RFA300A 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 RFA300A Measurement Set SVSB Service Manual Maintenance Removing the Acquisition 1 Remove the circuit board retaining plate see Figure 6 3 Module
32. Tools Wris eleja see sexe O of Chania Power Asti ge Lower Channel B7 8 dB Upper Channel B 9 dB I W Adimcent Channel Mack Test Pass f Enhed Freq Lumen 3 28 38 2 44B FH Tektronix Figure 4 10 Out of Channel measurement accuracy showing reduced second tone amplitude Calibrate Touch Screen if Option LC or PQA3FLC kit installed 1 In the RFA300A PV folder double click on the Touch Screen to start the Touch Screen Control Program 2 Click on the Calibrate button in the Touch Screen Control Program to start the calibration RFA300A Measurement Set 8VSB Service Manual 4 25 Performance Verification Knob Test Test Serial Port 1 4 26 Following the instructions use your finger to touch the center of the cross Exit the Touch Screen Control Program In the RFA300A PV folder double click on the Knob Test icon to open the Knob Test dialog box Click the LEDs On and LEDs Off buttons and verify that the lights for the nine keys on the bottom left portion of the front panel keypad turn on and off Turn the knob to verify that the right edge of the knob test dialog box shrinks and expands as you turn the knob Click OK to exit the Knob Test dialog box Connect the RS 232 Loop back connector to the RS232 port at the rear of the RFA300A In the RFA300A PV folder double click on the Tes
33. 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 RFA300A Measurement Set 8VSB Service Manual xi Service Safety Summary xii RFA300A Measurement Set 8VSB Service Manual Preface This manual contains the servicing information for the RFA300A Measurement Set 8VSB This instrument is composed of the RFA300A measurement set hardware and application software installed in a mainframe platform 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 RFA300A Measurement Set 8VSB Operating Information tells you how to install and operate the instrument Theory of Operation provides descriptions of the RFA300A measurement set modules Performance Verification describes how to verify the functional performance of the RFA300A 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
34. are trary RO RR RATES 4 6 Figure 4 4 Hwui screen with Synthsizer selected 4 17 Figure 4 5 Return loss test setup 4 20 Figure 4 6 Return loss calculation 4 21 Figure 4 7 Out of Channel Measurement limits test 4 23 Figure 4 8 Out of channel accuracy test setup 4 24 Figure 4 9 Out of Channel measurement accuracy test showing initial second tone amplitude 4 25 Figure 4 10 Out of Channel measurement accuracy showing reduced second tone amplitude 4 26 Figure 4 11 Windows Start window 4 27 RFA300A Measurement Set 8VSB Service Manual Table of Contents 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 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 10 Figure 6 3 Circuit board retaining plate 6 13 Figure 6 4 Acquisition module connector locations 6 14 Figure 6 5 Pilot lock module connector locations 6 15 Figure 6 6 Synthesizer module Frac N board cable connections 6 16
35. call 1 800 833 9200 Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices www tektronix com Module Repair and Return You may ship your module to us for repair after which we will return it to you RFA300A Measurement Set 8VSB Service Manual 10 1 Replaceable Parts New Modules You may purchase replacement modules in the same way as other replacement parts Using the Replaceable Parts List This section contains a list of the mechanical and or electrical components that are replaceable for the RFA300A 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 entry indicates the partis good for all serial numbers 5 This indicates the quantity of parts used 6 Name amp description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appe
36. connector a Liftup floppy drive connector locking latch b With the contacts of the short end of floppy drive cable facing towards the floppy drive insert cable into floppy drive connector as shown in Figure 6 14 c While supporting the circuit board push the locking latch closed Reinstalling the CD and When the CD and Floppy drive assembly is assembled install it into the chassis Floppy Disk Drive as follows Assembly 2 6 26 1 Align the assembly with the slot in the chassis Slide the assembly into the compartment see Figure 6 14 Line up the attaching screw holes and install the three attaching screws two in the front and one in the rear of the assembly Attach the audio cable to the CD drive four pin connector aligning the white dot on the audio cable with pin 1 of the connector RFA300A Measurement Set 8VSB Service Manual Maintenance 5 Attach the floppy drive cable to the floppy drive connector as follows a Lift up the floppy drive connector locking latch b With the contacts of the short end of the floppy drive cable facing toward the floppy drive insert the cable into the floppy drive connector as shown in Figure 6 14 c Push the locking latch closed it may help to push in on the latch while pushing down 6 Attach the CD ROM cable to the connector on the CD ROM Interface board as shown in Figure 6 14 Audio cable DROM Floppy drive cable CDROM cable C
37. data The 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 RFA300A measurement set without the mouse or keyboard Figure 2 5 shows the front panel Tektronix RFA300A Measurement Set 8VSB Figure 2 5 RFA300 Measurement Set 8VSB front panel RFA300A Measurement Set 8VSB Service Manual 2 7 Operating Basics 2 8 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 lists front panel key controls and describes their use Table 2 2 Front panel key controls Control name Mechanism Description Up Arrow Button Navigate and change focus from one window Left Arrow 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 colo
38. 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 RFA300A Measurement Set 8VSB Service Manual Operating Basics For some measurements you cannot enter values for all limits because it would be counter productive 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 ratio to be as high as possible Masks The mask testing feature is not on when you receive your measurement set To turn masks on and off or to select different masks do the following 1 Open a 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 or 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 w
39. is still good The process should take less than 15 minutes CAUTION The following procedure should preserve the data on Partition 2 D drive However under some extreme conditions such as problems with the partition table or Partition 2 the data may be lost Therefore you should back up important data on disks or over the network before beginning this procedure 1 Power up the RFA300A Measurement Set 8VSB with the RFA300A System and Application Restore Media CD ROM the CD ROM drive 2 Enter restpl bat at the DOS prompt 3 Click Continue when prompted 4 Inthe warning dialog box confirm with Yes A window will show the progress of the restore function 5 Remove the CD ROM from the drive and restart the system when prompted RFA300A Measurement Set 8VSB Service Manual Maintenance Easy Restore If Partitions 1 and 2 are both corrupted or you want to restore the hard drive to Partitions 1 amp 2 factory status use the Partition 1 procedure on page 6 52 except replace restpl bat with restdisk bat This will remove all of the data from both partitions Create Partition 2 restore only Partition 2 to factory status removing all data from Partition 2 without removing data from Partition 1 you can use the following procedure This procedure uses the Windows NT Disk Administrator tool to create a new Partition 2 After you create Partition 2 using this procedure if you later use the Easy Restore Partition
40. is used in the desired to undesired power ratio S N calculations The various outputs of the software demodulation process are passed to the measurement algorithms Pilot 0 Hz 0 Fsample 43 05 MHz Tsample Tsymbol 4 Tsample Tsymbol 4 ee z See 71 ee TU 71 Data from a gt FIR Filter Resampler L1 Scaling and A D Converter 7 1 i Pilot Offset 1 1 Estimator NN l pi Con Matched Filter Timing TN Pilot p p Estimator Scaling Amplitude pilot Phase I Normalization l Estimator Q Oo ej Pil2 k MT Estimate an es i Down Conversion mm iing ae Megat a Eeng o aj GESTION UO ol 6 Filtered Unequalized S amples Tsym 2 Tsym 4 ETE Filtered Equalized S ampl Process ape o Normalization gt FIR Filter Equalizer gt Tsym Tsym 2 output samples Equalized Coefficients without lt Scaling Sy qua deli Raised Root Cosine Tsym 2 Tsym 4 Filtering Symbol FIR FIR Filter Unfltered Equalized Samples s Resampler X ui Tsym 4 2o Unfiltered Unequalized Samples
41. male Example Rohde amp Schwarz FSEB20 30 Spectrum Analyzer Tektronix part number 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 7 to channel 69 output power in the range of 10 mW to 2 W 10 dBm to 33 dBm digital TV test signal source Performance verification and adjustment software RFA300A Measurement Set 8VSB Service Manual RFA300A Performance Verifi cation and Field Adjustment S oftware diskette Tektronix part number 063 3411 00 included with RFA300A Service Manual 5 1 Adjustment Procedure Normalize the RFA300A The normalization procedure is required if any of the RFA300A Operational Checks starting on 4 12 failed Normalization is a software routine that performs internal measurements and adjustments of the hardware to optimize the operation of the RFA300A 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 Connect the RF Input 1 connector of the RFA300A measurement set to the 8VSB reference quality signal using a 50
42. ment set application software or with other installed software Before running any of the diagnostics check the online release notes to verify that the instrument software matches the module firmware Many software problems are 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 System Recovery on page 6 49 for instructions on reinstalling software Table 6 2 shows software and hardware troubleshooting information and recommended actions If you suspect problems with the software contact your local Tektronix representative or refer to Contacting Tektronix in the Preface on page xiv 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 RFA300A Measurement Set 8VSB Service Manual 6 5 Maintenance 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 Instrument does not recognize accessories such as mouse or keyboard Windows comes up butthe RFA300A measurement set application does not Windows comes up in Safe mode If you are certain that you have installed the instrument correctly run the extended diagnostics see page
43. of the repair or adjustment services RFA300A Measurement Set 8VSB Service Manual Specifications Product Description Specification Tables This section gives a general description of the RFA300A Measurement Set 8VSB and lists the electrical physical and environmental characteristics See Replaceable Mechanical Parts for a list of standard and optional accessories The RFA300A measurement set provides information on 8VSB digital television signals in conformance with the ATSC Digital Television Standard Signals are acquired at the transmitter and the measurements consist of the following m Complex Modulation Error Ratio m Signal to Noise Ratio m Error Vector Magnitude m Pilot Amplitude Error m Out of Channel Emissions m Frequency Response Error m Group Delay Amplitude Error Phase Error Phase Noise Error m Peak to Average Ratio m Channel Spectrum display of the selected channel not a measurement The instrument s measurements can run continuously thereby monitoring transmitter performance on a constant basis The tables list the specifications for the RFA300A 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 symbol are checked in the Performance Verification procedures given in this service manual RFA300A Measurement Set 8VSB Service Manual 1 1 Specifica
44. output port Pin assignments 1 Red 2 Green 3 Blue 4 NC 5 GND 6 AGND 7 AGND 8 AGND 9 key 10 GND 11 NC 12 NC 13 HSYNC 14 VSYNC 15 NC 10 Base T 100 Base T on PCI bus RJ 45 Connector Plug amp Plan compatible Bus master mode RJ 45 Pin assignments 1 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 28 V 2 maximum Pin assignments 1 Normally closed 3 Common 5 Normally open RFA300A Measurement Set 8VSB Service Manual Specifications Power Characteristics Table 1 6 AC power source characteristics Characteristic Description Source Voltage Range for the line voltage needed to power the RFA300A measurement set to meet performance requirements 90 VAC to 250 VAC RMS 47 Hz to 63 Hz continuous range CAT Fuse Rating 8A Fast 250 V Maximum P ower Consumption 540 Watts max 170 Watts typical Steady State Input Current 6 Amps max 1 9 Amps RMS typical Inrush Surge Current 65 Amps maximum Power Factor Correction Yes RFA300A Measurement Set 8VSB Service Manual 1 13 Specifications Environmental Characteristics Table 1 7 Environmental characteristics Characteristic Cooling airflow Required Clearance Use Rating Atmos pherics Temperature Operating meeting accuracy specifications Description Intake is from the front and sid
45. shielding strips around the front of the chassis The fingers of the strip are easily bent and you could cut your fingers on protruding sharp edges when you handle the chassis Replacing the Cabinet 1 Place the protective front cover on the face of the measurement set 2 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 that all of the internal cables are clear and do not catch 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 of the edges over the EMI strips and under the tabs 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 that attach the handle to the chassis see Figure 6 1 RFA300A Measurement Set 8VSB Service Manual 6 11 Maintenance Replacing the Bezel Trim Ring Application Modules 6 12
46. 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 CD ROM and Stereo Port Tests 1 Ifthe Start task bar is not present on the bottom of the screen press the Start button to display it 2 Push the release button in the center of the CD drive drawer to release the drawer 3 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 4 Close the CD drive drawer 5 Wait approximately 15 seconds for tune sounds to be played by the measurement set speaker 4 10 RFA300A Measurement Set 8VSB Service Manual Performance Verification NOTE If no music is heard check the speaker volume control setting Single click the speaker icon to display the volume control Increase the volume control setting toward maximum up until you hear music from the measurement set speaker 6 10 11 12 13 14 15 16 17 18 With the mouse point to and double click on the speaker icon located at lower right corner of the screen In the Vo
47. test Measured value Test limit Residual S N 240 dB Residual EVM 1 Residual MER 240 dB Residual Flatness Error 0 25 dB peak to peak lt 8 ns peak to peak lt 105 dBc Hz at 20 kHz offset Residual Group Delay Error Residual Phase Noise Return Loss 2 25 dB Out of Channel Measurement Limit 80 dB Out of Channel Accuracy Measured value Calculated step size Step size test limits 7 dBm 17 dBm 10dB 2 dB 27 dBm 10dB 2dB 37 dBm 10dB 2dB 47 dBm 10dB 2dB 57 dBm 10dB 2dB 4 4 RFA300A Measurement Set 8VSB Service Manual Performance Verification Measurement Set Power On 1 Connect the keyboard to the keyboard port located on the lower left side panel at the front of the measurement set 2 Connect the mouse to the mouse port located on the lower left side panel at the front of the measurement set 3 Connect power cord to the mainframe power supply connector located on the rear of the measurement set NOTE The RFA300A 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 300A Measurement Set 8VSB On Stby switch Figure 4 2 On Stby switch 5 Before the measurement set starts loading Windows NT perform the following check Check that the keypad button
48. the chassis Reinstall the Backplane Use the following procedure to reinstall the backplane circuit board into the mainframe card bay 1 Place the backplane board assembly into the mainframe chassis See Figure 6 32 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 Connect the RS232 cable connector to the backplane circuit board Reinstall the PCI plug in modules using their reinstallation instructions Reinstall the power supply assembly using its reinstallation instructions refer to Power Supply Removal and Replacement on page 6 36 Reinstall the circuit board retaining plate Reinstall the cabinet and front bezel trim ring to complete the instrument assembly refer to Replacing the Bezel Trim Ring on page 6 12 and Replacing the Cabinet on page 6 11 RFA300A Measurement Set 8VSB Service Manual 6 47 Maintenance 6 Power supply connectors o f f N N Figure 6 32 Backplane orientation and screw locations RFA300A Measurement Set 8VSB Service Manual 6 48 Maintenance System Recovery If you have problems with either BIOS configuration or system application software use the procedures in this section to restore the system to factory default installation and configu
49. the ribbon cable connector from the front panel interface circuit board Reinstalling the Flat Panel 1 Make sure that all of the cables to the interface assembly are properly Display connected see Figure 6 11 2 Position the flat panel display with the display assembly interconnection near the front panel interface circuit board Connect the cable to the display connector on the front panel interface circuit board 3 Carefully slide the display assembly into the chassis to align it with the mounting screw holes 4 Install the six attaching screws two on the top two on the side and two on the bottom of the chassis 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 10 2 Disconnect the key pad interconnection cable from the front panel interface circuit board 3 Slide the key pad assembly out of the chassis RFA300A Measurement Set 8VSB Service Manual 6 21 Maintenance Keypad interconnection cable Figure 6 10 Key pad assembly removal B Position the key pad assembly to slide it into the chassis
50. the transmitter s spectral amplitude as a function of frequency with respect to the ideal 8VSB root cosine transmitter curve Measurements are made from 0 to 5 68 MHz with respect to the pilot frequency of the Signal under test 0 25 0 05 x p p 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 45 68 MHz with respect to the pilot frequency of the signal under test Display Accuracy 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 Plots the signal 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 40 2 x degrees measured error degree RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 2 Measurement specifications Cont Characteristic Phase Noise Phase Noise Marker Accuracy Residual Pha
51. troubleshooting information and procedures Options provides a brief description of the available options for the RFA300A measurement set Replaceable Parts List gives all module and mechanical parts that make up the RFA300A measurement set Parts are identified on an indexed illustra tion to make them easier to identify RFA300A Measurement Set 8VSB Service Manual xiii Preface Related Manuals The RFA300A Measurement Set SVSB User Manual details how to operate the measurement set Manual Conventions The following terms and conventions are used throughout this manual m The term measurement set is used interchangeably with the more formal term RFA300A Measurement Set 8VSB m The term platform refers to the mainframe platform that hosts the RFA300A Measurement Set 8VSB modules Contacting Tektronix Phone 1 800 833 9200 Address Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email support tektronix com 1 800 833 9200 select option 3 1 503 627 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 l
52. 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 Push Cancel In the Hwui window select Synthesizer Set LOLow Filter to the band associated with 21 52 MHz Example LOLow Filter 5 Set Coarse Tune to the value associated with 21 52 MHz Example Coarse Tune 100 Push the Coarse Tune button Set Ref Src to External 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 Measure the signal frequency with the spectrum analyzer counter The signal amplitude is usually about 40 dBm 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 2 3 4 In the Hwui window select MFG Deselect Synthesizer 10 MHz VCXO Calibration if it is highlighted Select Pilot Lock 86 MHz VCXO Calibration Push Start RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure 7 8 Use the arrow keys to
53. 0 B010112 1 CORE EM TOKIN EMC CORE ESD SR 15 TK1920 ESD SR 15 1 At time of manufacture instruments with serial numbers 010100 through B010112 included a ferrite bead Tektronix part number 276 0270 00 which joined three cables together The bead is not needed and is not included in newer instruments 10 12 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts 2422 7 41 WW NOZ2Y WX SANNA NA GES ys Figure 10 4 Single pin cables 10 13 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Replaceable parts list Fig amp index Tektronix Serialno Serial no number part number effective discont d 10 5 1 200 4408 00 2 348 1154 01 3 211 0738 00 4 367 0477 00 5 212 0213 00 6 161 0230 01 161 0104 00 7 390 1176 00 8 348 1515 00 071 0698 00 016 1441 00 161 0104 07 161 0104 08 016 1691 00 10 14 Qty Name amp description COVER PROTECTIVE 0 125 ABS BLACK HAIRCELL TEXTURED GSE W ADHESIVE FOAM FOOT CABINET P OLY CARBONATE LEXAN940 EARTH BROWN SCREW MACHINE 6 32 X 0 625 PNH STL BLK ZI TORX HANDLE CARRYING SCREW MACHINE 8 32 X 0 75 L P NH STL BLACK OXIDE PL TORX CABLE ASSEMBLY 3 18 AWG 92 L TAN 60 DEGREE C MC 6 3C G X RIGHT ANGLE BME 10A 125V CABLE ASSEMBLY 3 18 AWG 92 L TAN 60 D
54. 00A System and Application Restore Media CD ROM is SC3 Touch Screen Driver the CD ROM drive 1 Y From the Start menu run e drivers TouchBas tnsetup exe Select touch screen type DynaPro Serial SC3 Click OK to continue Select the following communication port settings in the Hardware Controls Serial dialog box Com Port COM 3 Address 3E8 IRQ 4 Baud Rate 2400 Parity None Data Bits 8 Stop Bits 1 Remove the CD ROM from the drive and restart the system From the Start menu select Programs Touch and then TouchScreen Control Click the Calibration button to perform calibration Follow the instructions to calibrate the touch screen Click the User Controls button and then click the Sound check box to deselect sound Install the My T Soft NT sure that the RFA300A System and Application Restore Media CD ROM is Soft Keyboard Driver the CD ROM drive 1 2 3 4 We 907 CIV SN UM From the Start menu run E Drivers Mytsoft SETUP EXE Follow the default options to install the driver Restart the machine as instructed After restart in the My T Soft group double click My T Soft Setup to start the setup On the My T Soft Setup utility click on the keyboard Make sure the International Keyboard is set to US Click OK Click Exit to exit My T Soft Setup Remove the CD ROM from the drive and restart the system RFA300A Measurement Set 8VSB Service Manual 6 57
55. 1000 4 11 Class A Radiated and Conducted Emissions Conducted Power Line Harmonic Currents Electrostatic Discharge 2 Radiated RF Electromagnetic Field 24 Electrical Fast Transient Burst 3 Surge Conducted RF 2 4 Power Frequency Magnetic Field Power line Fluctuation 3 Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Limits 1 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 ANSI ISA 82 01 1994 CAN CSA C22 2 No 1010 1 UL3111 1 61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Safety standard for electrical and electronic test measuring controlling and related equipment Safety requirements for electrical equipment for measurement control and laboratory use Standard for electrical measuring and test equipment Safety requirements for electrical equipment for measurement control and laboratory use 1 Compliance demonstrated using high quality shielded interface cables 2 EN 61326 Immunity Test requirement for Industrial Location intended use 3 EN 61326 Minimum Immunity Test requirement 4 Performance Criteria Signal Noise Ratio greater than or equal to 38 dB 1 16 RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 10 Certifications and compl
56. 11 750 X 6 000 IDE TO CD ROM 2 174 4240 00 1 CA ASSY RIBBON IDC 28AWG 4 450L BOX FEMALE 06009 174 4240 00 RTANG 50P OS 2MM CTR CONN 29 3 174 4229 00 1 CABLE ASSEMBLY PARALLEL PORT 2 500 INCHES 06009 174 4229 00 4 174 4226 00 1 CABLE ASSEMBLY LPT PARALLEL PORT 2 X 13 2 50 06009 174 4226 00 INCHES 5 174 4221 00 1 CABLE ASSEMBLY FLOPPY 2 X 17 2 500 INCHES 060D9 174 4221 00 6 174 4225 00 2 CABLE ASSEMBLY KEYBOARD MOUSE COM1 2X 06009 174 4225 00 5 3 850 INCHES 7 174 3786 01 1 CA ASSY SP RIBBON FLX 26 0 039 CTR TIN PLATED 10 20 174 3786 01 END FOR ZIF LINE CONNECTOR 8 174 4223 00 1 CABLE ASSEMBLY FRONT PANEL INTERFACE 2X 06009 174 4223 00 50 15 0 INCHES 9 174 4228 01 1 CAASSY IDE TO HARDDRIVE FROM PIO 2MM 2X 06009 174 4228 01 22 2 0 INCHES 10 174 3814 00 1 CA ASSY SP ELEC RIBBON IDC 4 26 30 AWG 15 0 060D9 174 3814 00 L FEMALE BERG 69307 004 11 174 3787 00 2 CA ASSY SP ELEC RIBBON DISPLAY ADAPTOR 060D9 174 3787 00 BOARD FLX 50 28AWG 6 5 L RCPT 2 X 50 FEMALE STR 0 079 C 12 174 3789 00 1 CA ASSY SP ELEC RIBBON FRT PNL 060D9 174 3789 00 POWER IDC 30 28AWG PVC 3 FOLDS 2 25 L 8 5 L 5 5L 2 5L 13 174 4237 00 1 CA ASSY SP BR RIBBON USB SPEAKER 26AWG 1X 06009 174 4237 00 60 1 2 1X40 1CTR 10 10 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Figure 10 3 Ribbon cables 10 11 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Replacea
57. 111 NW 5TH PLACE 14181 SW MILLIKAN WAY 814 HAYDEN MEADOWS DRIVE C O TEMCO NW 1336 SE 51ST STREET 7025 WEST MARCIA RD 27929 SW 95TH SUITE 101 ARROW RICHEY VALUE ADDED 3601 SW MURRY BLVD SUITE 60 RFA300A Measurement Set 8VSB Service Manual City state zip code BEAVERTON OR 97006 TUKWILA WA 98188 VANCOUVER WA 98682 BEAVERTON OR 97077 0001 TWIN FALLS ID 83301 ROCKFORD IL 611045181 HILLSBORO OR 97124 TIGARD OR 97224 PORTLAND OR 97220 SAN J OSE CA 95134 VANCOUVER WA 98682 SALEM OR 97303 TACOMA WA 98411 0610 MOUNT PROSPECT IL 60056 BEAVERTON OR 97008 7163 TSUEN WAN N T HONG KONG CN CANBY OR 97013 BEAVERTON OR 97005 PORTLAND OR 97217 HILLSBORO OR 97123 MILWAUKIE WI 53223 WILSONVILLE OR 97070 BEAVERTON OR 97005 Replaceable Parts Replaceable parts list Fig amp index Tektronix number number 10 1 1 343 1652 00 2 211 0722 00 3 671 4793 00 4 407 4699 00 5 672 1551 01 6 407 4705 00 7 131 0890 01 8 672 1505 00 9 672 1507 00 672 1507 01 10 407 4526 00 1 407 4571 00 12 407 4642 00 13 174 3887 00 14 174 3886 00 15 672 0397 00 16 211 0721 00 17 650 3760 00 650 3760 01 18 441 2180 00 19 174 3795 00 Serial no effective B010101 B010109 Serial no discont d B010100 B010108 Qty amp description 17 PP rA nA RETAINER CIRCUIT BOARD SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR CIRCUIT BD ASSY PROC
58. 13 00 10 7 Replaceable Parts Replaceable parts list cont Fig amp index Tektronix Serial no Serial number number effective Qty amp description Mfr code Mfr part number 22 119 6304 00 1 DISK DRIVE WINCHESTER 2 5 IN 6 0GB SINGLE 04956 MHK2060AT PLATTER IDE MHK2060AT 119 6493 00 1 DISK DRIVE WINCHESTER 2 5 IN 10GB SINGLE 9F560 119 6493 00 PLATTER IDE 07N4390 23 407 4515 01 1 BRACKET HARD DRIVE MTG 0 050THK AL ALLOY TK1943 407 4515 01 5052 32 24 211 0895 00 2 SCREW MACH M2 6 X 0 45 X 0 01 211 0895 00 8MM PHILLIPS PNH ZINC YELLOW 25 211 0910 00 SCREW MACHINE M3 X 0 5 X 4AMM PNH STLZIPLT 74594 210 0910 00 PHL 26 671 4952 00 1 CIRCUIT BD ASSY INTERFACE 80009 671 4952 00 TESTED 389 2955 00 WIRED 27 119 5694 00 1 FAN DC TUBEAXIAL 12 V 2 7W 83 CFM 56 8 61058 FBA09A12H DBA 2850 RPM 92MM X 92MM X 25MM 28 407 4700 00 1 BRACKET ASSY FAN MOUNTING TK1943 407 4700 00 10 8 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Figure 10 2 Mainframe parts 10 9 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Replaceable parts list Fig amp index Tektronix Serial no Serial number part number effective disconttd Qty amp description Mfr code Mfr part number 10 3 1 174 4224 01 1 CA ASSY SP RIBBON ICD 44 28 AWG 10 250 X 060D9 174 4224 01
59. 1507 00 672 1507 01 407 4526 00 407 4571 00 407 4642 00 174 3887 00 174 3886 00 672 0397 00 ORDER BY DESCRIPTION 650 3760 00 650 3760 01 441 2180 00 174 3795 00 10 5 Replaceable Parts Figure 10 1 Replaceable PCI Modules RFA300A Measurement Set SVSB Service Manual 10 6 Replaceable Parts Replaceable parts list Fig amp index Tektronix number number 10 2 1 211 0722 00 2 671 4778 00 3 131 0890 01 4 174 3761 00 5 6 672 1506 00 7 174 3875 00 8 211 1079 00 9 211 0950 00 10 407 4721 01 10 407 4721 02 u 119 6106 00 12 348 1432 00 13 671 4377 00 119 5728 00 119 5728 01 15 614 0943 02 16 366 0790 00 17 200 4384 01 18 334 9582 00 19 352 1068 00 20 366 0791 00 21 650 3761 00 650 3761 01 407 4513 00 Serial effective Jan 2001 Jan 2001 Serial no discont d Jan 2001 Jan 2001 Qty amp description 17 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR CIRCUIT BD ASSY PICMG BACKPLANE 679 4778 00 TESTED 389 2828 00 WIRED CONN HARDWARE DSUB J ACK SCREW 4 40 X 0 312 L HEX HD STL CD PL W O WASHERS amp NUT CA ASSY SP RIBBON RS232 IDC 9 3 5 L END TO END DSUB MALE RTANG 9 POS 0 109 CTR W THD INSER CIRCUIT BD ASSY MODULE DOWN CONVERTER 671 4234 00 ASSY SP DISCRETE CPD 8 11 0 L 2 X X12 FEMALE 0 165CTR STR MINI FIT JR X 1X 8 FEMALE SCREW MACHINE 2 6 X 0 45 MM 3 0L PNH STL NICKEL
60. 43 05 MHz BW Digitizer icd 2248571 2 i A Wide Clock l 10 76 MHz gt O E Clock 2 di 9 Narrow hi 43 05 MHz 258MH2 ok Power rails TX A 47 0 To various circuit mw P ower Interface controls Symbol Lock Hook i Power I2C Interface control Ref Freq 2 D A 86 MHz Clock md EC 526 7295 oe MHz 4240H 7777 Figure 3 7 Pilot lock block diagram RFA300A 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
61. 6 5 to identify any problems with the individual modules 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 power source Check thatthe 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 atthe power source Instrument failure contact your local Tektronix service center Controls turned down adjust controls for brightness and contrast Faulty flat panel display module contact your local Tektronix service center Check for a CD ROM 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 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 the RFA300A measurement set application at power on Start application from the desktop by double clicking on the RFA300A icon Faulty or corrupt software reinstall the RFA300A measurement set application software Exit the Safe mode and restart the instrument Instrument will not power off with On Standby switch 6 6
62. 6 25 Insert I O board into slot 12 6 42 Figure 6 26 Installing the I O circuit board 6 43 Figure 6 27 to controller board top interconnections 6 44 Figure 6 28 to controller board bottom interconnections 6 45 Figure 6 29 I O to controller board flat panel interconnection 6 45 Figure 6 30 I O to controller board speaker and USB interconnect ce hha ee ue e die he 6 46 RFA300A Measurement Set 8VSB Service Manual Table of Contents vi Figure 6 31 Figure 6 32 Figure 6 33 box Figure 6 34 Figure 10 1 Figure 10 2 Figure 10 3 Figure 10 4 Figure 10 5 IDE hard drive cable to I O circuit board 6 46 Backplane orientation and screw locations 6 48 Placement of bottom spacer pad in inner shipping of M S 6 62 Repackaging the RFA300A measurement set 6 63 Replaceable PCI Modules 10 6 Mainframe parts 10 9 Ribbon cables 10 11 Single pin cables 10 13 Cabinet parts and accessories 10 15 RFA300A Measurement Set SVSB Service Manual Table of Contents List of Tables Table 1 1 Input specifications 1 2 Table 1 2 Measurement specifications 1 4 Table 1 3 System components
63. 8VSB reference signal from the measurement set LO Low Resonator Check and Adjustment 5 4 LO Low Resonator Check Procedure 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 Bow oS Exit the RFA300A application if running In the RFA300A PV folder double click on the Hwui icon In the Hwui window select Synthesizer see Figure 5 1 In the Synthesizer window make the following selections a Select LOLow Filter 1 b Set LO Freq MHz 200 000 Set Tune Src Internal d Set Coarse Tune 50 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 Press the Update button in the Lock Indicators box 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 state of FracN L
64. CA 90640 6537 KANSAS CITY MO 64120 CAMARILLO CA 93010 MINNEAPOLIS MN 55435 3707 CARSON CA 90745 BEAVERTON OR 97006 SECAUCUS NJ 07094 INDIANAPOLIS IN 46237 9738 10 3 Replaceable Parts Manufacturers cross index Cont Mfr code 74594 7M 294 7X318 80009 86928 93907 TK0588 TK1163 TK1562 TK1920 TK1935 TK1943 TK1947 TK2058 TK2250 TK2411 TK2480 TK2548 TK2582 TK2647 TK6074 TK6108 TK6159 10 4 Manufacturer COMPONENT RESOURCES INC CARLYLE INC KASO PLASTICS INC TEKTRONIX INC SEASTROM MFG CO INC CAMCAR DIV OF TEXTRON INC UNIVERSAL PRECISION PRODUCT POLY CAST INC XPEDX TOKIN AMERICA INC ACCRA FAB INC NEILSEN MANUFACTURING INC NORTHWEST ETCH TECHNOLOGY TDK CORPORATION OF AMERICA ARROW ELECTRONICS INC TEKTRONIX HONG KONG WILLAMETTE PLASTIC XEROX CORPORATION TUFF CAT USA LLC INSTRUMENT SPECIALTIES CO INC DYNAPRO THIN FILM PRODUCTS KENT H LANDSBERG CO ARROW RICHEY ELECTRONICS Address BUSSMAN PARTS C O CASEY LAKEY 14525 SW WALKER ROAD 6801 SOUTH 180TH STREET 5720 C 121ST AVE STE 110 14150 SW KARL BRAUN DR PO BOX 500 456 SEASTROM STREET ATTN ALICIA SANFORD 516 18TH AVE 1775 NW CORNELIUS PASS RD 14140 SW 72ND AVE SUITE 100 9111 NE COLUMBIA BLVD 155 NICHOLSON LANE 11007 NE 37TH CIRCLE 3501 PORTLAND RD NE 2601S HOOD ST PO BOX 110610 1600 FEEHANVILLE DRIVE 9500 SW NIMBUS AVE BLDG E 8 F MAPPIN HOUSE 98 TEXACO RD 1
65. Do the LO Low resonator adjustment first to center the LO Low resonator before doing the oscillator adjustments Preparation for Adjustments 10 MHz VCXO Frequency 5 8 Check Prepare to make the oscillator checks and adjustments using the following procedure 1 Connect the RF Input 1 connector of the RFA300A measurement set to the spectrum analyzer 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 Exit the RFA300A measurement application if it is running In the RFA300A PV folder double click the icon to run the hwui exe program Select the Down Converter menu 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 m 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 RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure Measure the 400 000 MHz signal using the spectrum analyzer Note The signal amplitude is low usually about 40 dBm Check the counter measurement for the following conditions a Ifthe counter measu
66. EGREE C MC 6 3C G X RIGHT ANGLE BME 10A 125V CABINET WRAPARO WITH HANDLE AND MTG FEET FEET CABINET CABINET FEET BLACK GLASS FIBRE REINFORCED PLASTIC SET OF 4 FEET 4 OPTIONAL ACCESSORIES MANUAL TECH SERVICE RFA300A ACCESSORY POUCH PLASTIC ASSY PWR 3 1 0MM SQ 240V 10A 2 5 METER RTANG IEC320 RCPT X 13A FUSED UK PLUG 13A FUSE U CA ASSY PWR 3 18 AWG 250 10A 98 INCH L RTANG IEC320 RCPT X STR NEMA 6 15P US RACKMOUNT KIT W INSTRUCTIONS RFA300A Measurement Set 8VSB Service Manual Mfr code TK2480 80009 93907 12136 0 01 2W733 80009 TK1943 TK1943 TK2548 TK2582 TK2541 TK6372 5Y 400 Mfr part number 200 4408 00 348 1154 01 ORDER BY DESCRIPTION PT 3170 212 0213 00 ORDER BY DESCRIPTION 161 0104 00 390 1176 00 348 1515 00 071 0698 00 TK1441 BLACK CORDURA ORDER BY DESCRIPTION 161 0104 08 016169100 Replaceable Parts Figure 10 5 Cabinet parts and accessories RFA300A Measurement Set 8VSB Service Manual 10 15 Replaceable Parts 10 16 RFA300A Measurement Set 8VSB Service Manual
67. ESSOR IO 679 4793 00 TESTED 389 2844 00 WIRED BRACKET PCI PROCESSOR 1 0 BOARD 18 GA CRS CIRCUIT BD ASSY PICMG PCI CONTROLLER 039 0072 01 18 CRS DTI PROCESSOR CONN HARDWARE DSUB J ACK SCREW 4 40 X 0 312 L HEX HD STL CD PL W O WASHERS amp NUT CIRCUIT BD ASSY DIGITIZER 039 0000 00 CIRCUIT BD ASSY MODULE PILOT 671 4286 01 CIRCUIT BD ASSY MODULE PILOT 671 4286 02 BRACKET 0 044 CRS ZINC PLATE 3 760 X 0 850 BRACKET 0 044 THK PCI BOARD PILOT LOCK C1010 1020 CRS ZI PLT BRACKET SYNTHESIZER 0 044 C1010 1020 CRS PCI NO EARS 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 SP RIBBON IDC 34 28 AWG 1 125 L 3M 33665 34 CABLE 2 X 17 FEMALE RTANG 0 100 CT CIRCUIT BD ASSY SYNTHESIZER MODULE 55 671 4284 00 amp 671 4285 00 SCREW MACHINE 6 32 X 0 375 PNH STL CDPL T 15 TORX DR PWR SUPPLY ASSY J AMAICA PWR SUPPLY ASSY J AMAICA CHASSIS ASSY AL ETCH amp CHROMATE CABLE ASSY SP SPEAKER CP D 30 26AWG 10 0 L 1X2 0 1CTR RCPT FEMALE LATCHING PLZ MTE RFA300A Measurement Set 8VSB Service Manual Mfr code TK1943 0 01 80009 1943 80009 1943 00779 80009 80009 80009 1943 1943 1943 06009 06009 80009 0 01 80009 80009 1943 06009 Mfr part number 343 1652 00 ORDER BY DESCRIPTION 671 4793 00 407 4699 00 672 1551 01 407 4705 00 205818 2 672 1505 00 672
68. Figure 6 15 Bracket screw locations for hard disk drive RFA300A Measurement Set 8VSB Service Manual Maintenance 1 With the bracket top mounting tab facing away from the hard drive as shown in Figure 6 15 place the hard drive against the bracket 2 Align the hard drive mounting holes with the bracket holes 3 Attach the hard drive to the bracket with four cross tip screws Torque each screw to 2 in Ibs 4 Plug the ribbon cable long end onto the hard drive connector as shown in Figure 6 16 Do NOT use the four end pins Figure 6 16 Hard drive ribbon cable orientation NOTE The orientation of the ribbon cable red colored band is shown in Figure 6 16 RFA300A Measurement Set 8VSB Service Manual 6 29 Maintenance Use the following steps to reinstall the hard drive assembly Hard Drive Assembly Replacement 1 Install the hard drive assembly onto the mainframe chassis as shown in Figure 6 17 Hard drive connector Chassis slot for hard drive bracket Figure 6 17 Hard drive installation with controller cable connectors 6 30 RFA300A Measurement Set 8VSB Service Manual Maintenance NOTE Insert the hard drive bracket into chassis slot as identified in Fig ure 6 17 Note the orientation of the pin I indicator on the ribbon cable Attach the hard drive assembly to t
69. Figures Figure 1 1 IF filter characteristics 1 3 Figure 1 2 8VSB transmitter emissions 1 8 Figure 2 1 Transmitter connection 2 3 Figure 2 2 Rear 2 4 Figure 2 3 Keyboard and mouse connections 2 5 Figure 2 4 On Standby switch 2 6 Figure 2 5 RFA300 Measurement Set 8VSB front panel 2 9 Figure 2 6 Home 2 13 Fig re 2 7 Toolbar e Re RE eos cea eis 2 14 Figure 2 8 System setup 2 15 Figure 2 9 Help menu 2 19 Figure 3 1 Platform block diagram 3 2 Figure 3 2 Simplified block diagram of the RFA300A 3 5 Figure 3 3 Software demodulation process 3 6 Figure 3 4 Down converter module block diagram 3 7 Figure 3 5 Digitizer module block diagram 3 8 Figure 3 6 Synthesizer block diagram 3 9 Figure 3 7 Pilot lock block diagram 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 I SEAV ceo tees euren s eque P alae
70. M Tsym 4 Figure 3 3 Software demodulation process 3 6 RFA300A Measurement Set 8VSB Service Manual Theory of Operation Down Converter 50 Ohm External P recision N 1W 30 dBm Max The RFA300A measurement set is designed to provide highly accurate measure ments of the 8VSB signal directly from the transmitter The down converter module processes the applied 8VSB signal and passes it on to the digitizer module and the pilot lock module A block diagram of the down converter module is shown in Figure 3 4 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 attenuator at the input terminals attenuates the normally high amplitude signal obtained from the transmitter sample output that can be in the range of 1 watt or more After the input attenuator a selector switch selects between the external input and 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 sing
71. M stores the digitized signal until it is accessed by the system controller for processing Communica tion of the data and addressing of the RAM is handled through the PCI interface an Digitizer Module 1 1 Full Scale lVpp RAM 512 kB L 4 1 0 Address 1 Decoder PCI Transceivers Platform Bus Figure 3 5 Digitizer module block diagram RFA300A Measurement Set 8VSB Service Manual Theory of Operation Synthesizer The synthesizer module provides the Local Oscillator LO frequency to the down converter A 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 channels from Ch 7 to Ch 69 to be down converted Two phase lock loop circuits control the frequency of the local oscillators 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 T
72. NC female to N type ktronix part number male 3 0045 00 10 dB attenuator N type female to N type male ktronix part number 119 6328 00 RS232 loop back connec Connector DB 9 purchased or user See Figure 4 1 forthe tor fabricated loop back connector wiring diagram Performance verification RFA300A Performance Verification 063 3411 00 software and Field Adjustment Software disk 1 Adapter types depend on the coaxial cables used to make the signal interconnec tions The example adapters assume 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 DB 9 Female Connector Rear View Pin Signal Name Abbreviation Pin 1 Carrier Detect CD Pin 2 Receive Data RD Pin 3 Transmit Data TD Pin 4 Data Terminal Ready DTR Pin5 Signal Ground SG Pin 6 Data Set Ready DSR Pin7 Requestto Send RTS Pin 8 Clear to Send CTS Pin 9 Ring Indicator Rl Figure 4 1 RS 232 loop back connector wiring diagram RFA300A Measurement Set 8VSB Service Manual 4 3 Performance Verification RFA300A Test Record Photocopy this page and use it to record the performance test results for your RFA300A Measurement Set 8VSB RFA300A Test Record Instrument Serial Number Certificate Number Temperature RH Date of Calibration Technician Channel Frequency RFA300A performance
73. NIC INDUSTRIAL CO ECG 61162 J FW INDUSTRIES INC Address CUSTOMER SERVICE DEPT PO BOX 3608 2904 ORCHARD PARKWAY 3000 COLUMBIA HOUSE BLVD SUITE 1 20 17303 RIDGELAND AVE 5825 N TRIPP AVE P O BOX 804238 4405 CUSHING PARKWAY 9730 INDEPENDENCE AVE PO BOX 737 403 NORTH MAIN 810 SE SHERMAN 5750 NE MOORE COURT 1643 HADDON AVE PO BOX 1448 2021 W VALLEY VIEW LN PO BOX 810839 13 NEPTUNE AVENUE PO BOX 350166 1900 WEST COLLEGE AVE 4300 SOUTH RACINE AVENUE 7 INDUSTRIAL WAY 1161 SANDHILL AVE 0 PO BOX 5228 6136 NE 87TH AVENUE 2200 US HWY 27 SOUTH PO BOX 1980 6520 N BASIN AVE 6505 KAISER DR 2880 SCOTT BLVD PO BOX 58062 7133 TELEGRAPH RD PO BOX 750 6010 PARRETTA DR 740 CALLE PLANO 5300 EDINA INDUSTRIAL BLVD 23839 S BANNING BLVD 1880 SW MERLO DRIVE M S 7H 4 TWO PANASONIC WAY 5134 COMMERCE SQUARE DRIVE RFA300A Measurement Set 8VSB Service Manual City state zip code HARRISBURG PA 17105 3608 SAN J OSE CA 95134 2009 VANCOUVER WA 98661 TINLEY PARK IL 60477 3048 CHICAGO IL 60646 FREMONT CA 94538 CHATSWORTH CA 91311 NEWBERG OR 97132 PORTLAND OR 97214 4657 HILLSBORO OR 97124 6474 CAMDEN NJ 08103 DALLAS TX 75381 5381 BROOKLYN NY 11235 0003 STATE COLLEGE PA 16801 2723 CHICAGO IL 60609 SALEM NH 03079 CARSON CA 90746 PORTLAND OR 97220 RICHMOND IN 47374 1980 PORTLAND OR 97217 FREMONT CA 94555 SANTA CLARA CA 95052 8062 MONTEBELLO
74. OPS RFASOOApy Yem Heb cee als el J xem gt Hive Gach Scien Conbgarador 6 Start the RFA300A 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 Select Input 1 for the RF Input 10 In the Instrument Tuning box set the frequency to 686 31 MHz or other channel frequency Click the Apply button 11 Click on the Verify Signal Input Power button 12 Check that the Input Signal Power thermometer display is green with the level in the OK range 13 Click the Close button Click OK to close the Instrument Setup menu 14 Go to the Tek Only selection in the toolbar Click on Normalization Calibra tion 15 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 16 Check that the Calibration Status is PASS RFA300A Measurement Set 8VSB Service Manual 5 3 Adjustment Procedure 17 Disconnect the
75. On 1 16 im AD Interface RAM 60 Clock from Pilot Lock e 8 1V p p 3 8 the effects of the filter the 8VSB IF signal Following the filter the signal takes one of two paths depending on the measurement being made Signal Demodulation Path Amplifiers in the signal demodulation path amplify and adjust the signal to the correct level for application to the digitizer 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 digitizer module The digitizer module contains the A D converter and local digitier RAM Figure 3 5 shows a simplified block diagram of the digitizer module The input to the module presents a nominal 50 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 digitizer clock at 43 05 MHz obtained from the pilot lock module clocks the A D converter The 512 kB RA
76. PL PHILLIPS CIS SCREW MACHINE M2X3MM PHL PNH STL NI PL BRACKET ASSY DRIVE MOUNTING 0 040 AL ALLOY 5052 H32 ETCH CHROMATE BRACKET ASSY DRIVE MOUNTING 0 040 AL ALLOY 5052 H32 ETCH CHROMATE DISK DRIVE FLOPPY 3 5INCH 1 44 MB FOOT 6 5MM W X 43 50MM L 2MM THK RUBBER BLACK INSTRUMENT SUPPORT CIRCUIT BD ASSY CD ROM INTERFACE 389 2561 00 WIRED DISK DRIVE OPTICAL 644MB CD ROM 16 7 MB SEC IDE ATAPI CD 224E 903 DISK DRIVE OPTICAL 644MB CD ROM 16 7 MB SEC IDE ATAPI CD 224E B93 KEYPAD ASSY RFA300A KNOB TV GRAY 0 920 ID X 0 9250 OD X 0 4750 H PC ABS BAYBLEND FR110 BEZEL BAYBLEND FR110 POLY TV GRAY MARKER IDENT LABEL POWER BUTTON LENS LIGHT CLEAR ACRYLIC LIGHT PIPE KEYCAP POWER 0 2X0 4X1 326 P OLY CARBONATE DISPLAY ASSEMBLY DISPLAY ASSEMBLY BRACKET DISPLAY DISP LAY MOUNTING 0 050 ALUMINUM ALLOY 5052 H34 RFA300A Measurement Set 8VSB Service Manual Mfr code 0 01 80009 00779 06009 80009 06009 0 01 0 01 1943 1943 2250 2411 80009 50356 50356 80009 1163 7X318 0 05 7X318 7X318 80009 80009 TK1943 Mfr part number ORDER BY DESCRIPTION 671 4778 00 205818 2 174 3761 00 672 1506 00 174 3875 00 10310188 0 0310248 0 407 4721 01 407 4721 02 FD O5HF 5630 348 1432 00 671 4377 00 CD 224E 903 CD 224E B93 614 0943 02 366 0790 00 2TEK1639X 334 9582 00 352 1068 00 366 0791 00 650 3761 00 650 3761 01 407 45
77. Protective bag 006 8164 00 Top tray cardboard insert 004 4912 00 1 Instrument support inserts top and 004 4913 00 2 bottom RFA300A Measurement Set 8VSB Service Manual Maintenance Table 6 3 Packaging material Cont Item Tektronix part number Index number Inner shipping box 004 4926 00 3 Shipping box 004 4914 00 4 Repackaging Instructions When the RFA300A is shipped it is important to provide it with the maximum protection Figure 6 33 shows how to repackage the RFA300A measurement set for shipment As the figure shows it is not necessary to have the accessories received with the RFA300A RFA300A measurement set 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 33 2 Remove the optional accessory pouch if installed and place the protective front cover on the front of the RFA300A measurement set 3 Place the RFA300A measurement set in t
78. Service Manual Operating Basics Making a Measurement The following overview shows how to make and save a measurement Refer to the online help for details on other operating features The help system is explained on page 2 17 Selecting RF Input Use the following procedure to select the RF Input channel select the channel Channel and Frequency frequency and verify that the RF input signal has sufficient power Without sufficient power at the test signal input the instrument cannot perform accurate measurements 1 Connect your transmitter to one of the RF input connectors shown on page 2 4 the connectors are internally terminated in 50 so no external termination is needed 2 Ifthe input signal strength is more than 1 watt but no greater than 2 watts make sure that the external 10 dB attenuator is installed 3 Poweron the instrument 4 Click the Setup button on the toolbar 5 Click on the System tab to display the System page shown in Figure 2 8 Lists tem kinaa Tuning ing Ferrea MH i scat 4 hal Fia Dang Fi Sie 5210 Das Mise Lar Lane Dk 4 Bm Figure 2 8 System setup 6 Click on the Input button to select the RF Input channel Input 1 or Input 2 to which you connected the transmitter Only one of these channels can be input at a time RFA300A Measurement Set 8VSB Service Manual 2 13 Operating Basics
79. Service Manual Tektronix RFA300A Measurement Set 8VSB 071 0698 00 This document applies to firmware version 2 0 and above 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 0001 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 defectiv
80. TS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Table of Contents Specifications Operating Information Theory of Operation General Safety Summary Service Safety Summary 230 6565 RR e ub dens Preface 5 25csir Een rarus ees ee a Related Manuals sek ee LER M REPE Rb WEM eoe Manual Conventions Contacting Tektronix 2 2 ee MERERETUR ae eect MUPODUCHION 555 Siete he eee Ke ueste Before You Begin use s a ae SR RURAL Service strategy cni ee es bebe LU LE dilate cbs te DENIS Tektronix Service Offerings Specifications cxlo Product Description RIS ee S Specification Tables ieee nt pee PIERII DCN Performance 08 RFA300A Measurement Set Specifications Measurement Specifications System Components i us oa eee ws T EE DURS Power Ch afracteristCs e o ge I EUER PER Rig E X S Environmental Characteristics Certifications and Complianees
81. acN 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 RFA300A Measurement Set 8VSB Service Manual 5 5 Adjustment Procedure 5 6 LO Low Calibration 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 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 CINE NN Synthesizer Pilot Pilot Loop Gain Calib 10MH2 tune r Test LO LOW Calib 34 Start Freq MHz Ha Channel Tuning amp Search Stop Freq MHz Adjust Pilot Loop VCO Freq Incr MHz Tune in Channel TEST LO LOW Cait Channel Tuning LO Loop Gain Calib Figure 5 2 Partial Hwui window with Calib selected 3 Press the Hw Setting button RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure 4 Scroll through the hardware settings until LO LOW Band data appears see
82. accessing the test routines amp RFA300A PV of x File Edit View Help Hardware UI Knob Test TektOnly Touch Screen Uninstall PY Port 1 1 objec s selected 388 bytes 2 RFA300A Measurement Set 8VSB Service Manual Performance Verification Preparation for Testing 1 Connect the RF input 1 connector of the RFA300A 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 The signal power applied to the RFA300A measurement set must be in the range of 10 mW to 1 W 10 dBm to 30 dBm for correct operation 2 Start the RFA300A application and wait for the application to finish initializing Verify that the Tek Only item appears in the RFA300A application menu From the Home window click the Setup button on the toolbar Select the System tab Select Input1 for the RF Input NOTE Refer to Selecting channel frequency in the RFA300A online help for the channel pilot frequencies 7 Enter the channel pilot frequency of the reference 8VSB signal connected to the RF input connector of the measurement set 8 Click on the Apply button 9 Click on the Verify Input Signal Power button 10 Verify that the input signal level is in the OK range in the green 11 Close the dialog box and click OK to close the Instrument Setup dialog box NOTE Make a copy of the RFA300A Test Record form o
83. 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 10 1 Restore Data Files A uv 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 Select TOUCHSCREEN CONTROL Select CALIBRATE Follow calibration instructions using fine tipped object that has a soft non scratching point Click on the OK box using the mouse Select EXIT After the testing and adjustments are finished restore the user setup and the user data files using the following steps 1 2 Exit the RFA300A application if it is running Insert the RFA300A Performance Verification and Field Adjust Software disk into the floppy disk drive In the RFA300A PV folder double click on the Rest
84. and draw a box that defines the area you want to zoom RFA300A Measurement Set 8VSB Service Manual 4 21 Performance Verification ar HFA J00 of Channel Ede View Toole wind Help SEE Setup Soon OL 44 Back Dut of Channa Power bo setae Powe Lower Channel 3 5 dB Upper Chanrnel B3 4 dH Fidi Freq Cursors ie Lumen 3 28 38 203 55 Tektronix Figure 4 7 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 1 Ifnotin 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 and Enhanced Accuracy and in the toolbar select High Smoothing 3 Setthe RFA300A measurement set to any frequency within the measurement range of the set For example use 686 MHz 4 Setthe RF signal generator carrier frequency to 2 67 MHz above the RFA300A measurement set frequency To set it for the example given in step 4 set the generator for 688 67 MHz 5 Set the 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 4
85. application if it does not start automatically Verify that the RFA300A application starts as it should and that the Tek Only menu item has been removed from the RFA300A menu bar Exit the RFA300A application and press the On Standby switch to turn off the instrument RFA300A Measurement Set 8VSB Service Manual 4 27 Performance Verification 4 28 RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure Equipment Required This section provides the recommended field adjustments for the RFA300A 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 RFA300A 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 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 Spectrum analyzer 50 coaxial cable Characteristic Frequency accuracy better than 10 Hz at 400 MHz Connectors N type
86. ar as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 7 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 Y 1 1 1972 Mfr Code to Manufacturer table titled Manufacturers Cross Index shows codes names and addresses Cross Index of manufacturers or vendors of components listed in the parts list 10 2 RFA300A Measurement Set 8VSB Service Manual Replaceable Parts Manufacturers cross index Mfr code Manufacturer 00779 TYCO ELECTRONICS CORPORATION 04956 FUJITSU COMPUTER PRODUCTS OF AMERICA INC 060D9 UNITREK CORPORATION 06383 PANDUIT CORP 06915 RICHCO OADN8 DELTA PRODUCTS CORP DPZ 001 6 TECHNOLOGIES INC 0J 9P9 GEROME MFG CO INC 0 01 STAUFFER SUPPLY 0 05 NORTH STAR NAMEPLATE INC 12136 PHC INDUSTRIES INC 13103 THERMALLOY INC 15542 MINI CIRCUITS LABORATORY 18796 MURATA ELECTRONICS N AMERICA 1AW87 LEWIS SCREW CO 1DM20 PARLEX CORP 26233 NYLOK FASTENER CORP 2K262 BOYD CORPORATION 2W733 BELDEN WIRE amp CABLE COMPANY 3M099 PORTLAND SCREW COMPANY 46628 LOGITECH INC 4T165 NEC ELECTRONICS INC 50356 TEAC AMERICA INC 53733 FILTRONETICS INC 54407 POWER ONE INC 55285 BERGQUIST COMPANY INC THE 57003 CHOMERICS INC 5Y 400 TRIAX METAL PRODUCTS INC 61058 PANASO
87. at position make sure that you properly route any cables that are connected to the rear of the instrument to avoid damaging them Before you can operate the product you must connect the 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 RFA300A measurement set is limited to situations where a single high am plitude 8VSB RF signal is available for direct input to the measurement set Refer to RF Connections RFA300A Measurement Set 8 Service Manual 2 1 Getting Started Operating Requirements RF Connections Table 2 1 lists the operating requirements for the RFA300A measurement set Refer to Specifications for a complete specification list Table 2 1 Operating requirements Requirement Specification Source voltage 90 250 47 63 Hz Steady State input current 6 Arms maximum 1 9 A typical Maximum power consumption 540W Temperature 0 C to 45 C 32 F to 113 F 30 C hr max gradient non condensing derated 1 C per 1 000 ft above 5 000 ft altitude Humidity 20 to 80 relative humidity non condensing Max wet bulb temperature 31 C derates relati
88. atch Lock and FracN RT Lock If either FracN Latch Lock or FracN RT Lock is not checked C688 needs to be adjusted RFA300A Measurement Set 8VSB Service Manual Adjustment Procedure LO Frequency a LD Functiona 221777 mj tose Bra LO Freq pHs 200 Band Divider P zl Enable Bande Hi Fre ac LO Signal Band Cinicer Dissbie 1 z r Upper Loop Ew Hi F F EIH Free atia 200 020 epe 2 FN CN w FurMBnad inckcatoe Gain 121 prr LO Latch Leck LO Lock F LDLow Fir 1 pe rea Lock Update Fined Ste Be 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 If all the Lock Indicators are checked press the FracN ADC button and note the value NOTE The value for FracN ADC will not be correct until the FracN ADC button is pushed 10 If the FracN ADC voltage reading is between 0 80 V and 40 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 The LO Low Resonator adjustment C688 is adjusted by inserting a screwdriver Adjustment through the hole in the shield on the rear panel 1 Ifeither Fr
89. aving to restore the entire partition Make sure that the RFA300A System and Application Restore Media CD ROM is in the CD ROM drive 1 From the Start menu select Control Panel 2 In the Control Panel select Multimedia 3 In the Device tab select Audio Devices 4 Select ES1879 1869 1878 1868 1887 1888 Audio and click the Remove button Restart the system In the Control Panel select Multimedia In the Device tab select Audio Devices Select Audio Device and click the Add button 292190 712 Select Unlisted UPdated Driver 10 Specify the E Drivers Essaudio directory as the driver location 11 Click OK to install the ES 1879 1869 1878 1868 1887 1888 Audio driver 12 Remove the CD ROM from the drive and restart the system Make sure that the RFA300A System and Application Restore Media CD ROM is in the CD ROM drive 1 From the Start menu select Control Panel In the Control Panel select Display Select the Settings tab Click the Display Type button Click the Change button 2 3 4 5 Click the Have Disk button 6 7 Specify the e Drivers ChipsTec directory as the driver location 8 After the disk is scanned and the driver is installed remove the CD ROM from the drive and restart the system RFA300A Measurement Set 8VSB Service Manual Maintenance Configure the Display Configure the COM Ports m From the Start menu select Control Panel In the Control Pan
90. ble parts list Fig amp index Tektronix Serial no Serial no number part number effective disconttd Qty amp description Mfr code Mfr part number 10 4 1 174 3865 01 1 ASSY RF COAXIAL RFD 1 500HMS RG174 17 0 06009 174 3865 01 1 TO MMCX 2 174 3865 01 1 ASSY RF COAXIAL RFD 1 500HMS RG174 17 0 06009 174 3865 01 1 TO MMCX 3 174 3863 00 1 CA ASSY RF RFD 1 RG174 50 6 001 060D9 174 3863 00 STR TO MMCX STR 4 174 3967 00 1 CA ASSY RF COAX RFD 1 50 OHM RD 316 4 75 060D9 174 3967 00 L MMCX PLUG STR X MCX J ACK STR 5 174 3865 01 1 ASSY RF COAXIAL RFD 1 500HMS RG174 17 0 06009 174 3865 01 1 TO MMCX 6 174 3865 01 1 ASSY RF COAXIAL RFD 1 500HMS RG174 17 0 06009 174 3865 01 1 TO MMCX 7 174 3872 00 1 CA ASSY RF COAXIAL RFD 500HM RG316 20 0 060D9 174 3872 00 L MMCX PLUG STR X SMA PLUG RTANG 8 174 3967 00 1 CA ASSY RF COAX RFD 1 50 OHM RD 316 4 75 060D9 174 3967 00 L MMCX PLUG STR X MCX J ACK STR 9 174 3873 00 1 CA ASSY RF COAXIAL RFD 1 50 OHM RG316 10 0 060D9 174 3873 00 L SMA PLUG RTANG X MMCX PLUG STR 10 174 3864 00 1 CA ASSY RF RFD 1 RG174 50 10 01 060D9 174 3864 00 STR TO MMCX STR 11 174 3967 00 1 CA ASSY RF COAX RFD 1 50 OHM RD 316 475 060D9 174 3967 00 L MMCX PLUG STR X MCX J ACK STR 12 174 3863 00 1 CA ASSY RF RFD 1 RG174 50 6 001 060D9 174 3863 00 STR TO MMCX STR 276 0270 0001 01010
91. chassis There are three snaps across the top and three across the bottom Remove the front panel bezel as follows 1 Use smooth jaw pliers to grasp the On Stby key and pull straight out on the key to disconnect the key cap from the switch 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 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 Lift the bezel off the front of the chassis Removing the Cabinet cabinet must be removed to access any of RFA300A measurement set application modules and to access the mainframe modules and cable connectors to the controller board Use the following procedure to remove the cabinet 1 2 sure that you are wearing a static grounding wrist strap Before removing the cabinet power down the RFA300A measurement set and unplug the power cord Disconnect any cables connected to the rear panel connectors of the measurement set Note their locations for reinstallation Put the protective front cover on the measurement set and set the cabinet on the working surface with the rear panel up Remove the two screws from the handle on the left side of the cabinet see Figure 6 1 These screws attach to posts mo
92. e 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 20 fior the screw locations Reinstall the Interface Board Install the interface board onto the mainframe chassis as shown in Figure 6 20 1 Orient the interface board so that the board components are facing up and the mouse keyboard connectors are to the left Align the interface board mounting holes with the chassis studs and place the board onto the chassis Figure 6 20 Screw locations for the interface circuit board 3 Attach the interface board to the 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 Ibs Route both fan wire harnesses through the slot in the chassis as shown in Figure 6 21 Plug the left side fan wire harness into the interface board J410 left FAN connector as shown in Figure 6 21 RFA300A Measurement Set 8VSB Service Manual Maintenance 6 Plug the right side fan wire harness into the interface board J420 right FAN connector as shown in Figure 6 21 7 Route the speaker wire harness through the top right chassis ventilation hole as shown in Figure 6 21 8 Plug speaker wire harness into interface board J980 c
93. e product to the service center designated by Tektronix with shipping 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 I
94. e signal frequency with the spectrum analyzer counter The signal amplitude is low usually about 40 dBm Check that the counter measurement frequency is greater than 430 487 000 Hz and less than 430 492 000 Hz If it is outside these limits perform the 86 1 MHz VCXO Frequency Adjustment procedure starting on page 5 10 Close the hwui application RFA300A Measurement Set 8VSB Service Manual Performance Verification Input Return Loss Check This test checks that the input impedance of the RFA300A measurement set meets the specification for a return loss of greater than 25 dB over the test frequency range Make the test using the following procedure 1 Set up the test equipment as shown in Figure 4 5 Do not connect the SWR bridge to the RF input of the RFA300A RFA300A Analyzer rear Spectrum analyzer with tracking generator Rear panel RF input connector N type barrel connector A Tracking generator output Spectrum analyzer input SWR Bridge 50 Q coaxial cables Figure 4 5 Return loss test setup 2 Set the spectrum analyzer as follows 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 t
95. easurement window and the Signal Monitor window The toolbar provides an easy way to access frequently used functions Figure 2 7 shows the toolbar followed by a list of the functions RFA300A Measurement Set 8VSB Service Manual 2 11 Operating Basics Recall Smoothing Run S top What s Results Print Selection i Back amp Forward This Ek Edt Setup Took window Hele as TI Save E dit Results Setup Status T TERT Figure 2 7 Toolbar Table 2 4 Toolbar functions Toolbar selection Function Recall Results Recalls a previously saved measurement Save Results Saves the results of the current measurement Print Prints one copy of the current measurement Edit Setup Provides setup controls for the instrument and measurements Smoothing Selection 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 Shows when the measurement is running or stopped red is stopped and green is running Run S top Button Begins or stops performing measurements Back and Forward Back opens the previously opened window Forward opens the following window Home Returns to the Home Window What s This Provides a brief description of the selected control or object 2 12 RFA300A Measurement Set 8VSB
96. edure Press here on 1 0 board when pressing 1 0 board into Backplane J 11 connector Figure 6 26 Installing the I O circuit board RFA300A Measurement Set 8VSB Service Manual 6 43 Maintenance Connect 1 0 board to Controller board The interconnection cables between the I O board and the controller board have to be connected in sequence that permits all the cables to be attached Use the following step to make the cable connections 1 Plug the com 1 ribbon cable from J290 of the I O board to the center 10 pin connector J16 on the controller board as shown in Figure 6 27 Plug the floppy drive ribbon cable from J271 of the I O board to the top 34 pin connector of the controller board E 10 J 260 cable plugs onto 1 0 J 271 Cable plugs onto top 40 pin connector 00 34 pin connector Figure 6 27 1 0 to controller board top interconnections Plug the IDE hard drive ribbon cable from J260 of the I O board to the top 40 pin connector of the controller board Plug the keyboard and mouse ribbon cable from J190 of the I O board to the bottom 10 pin connector as shown in Figure 6 28 Plug the ribbon cable from J170 of the I O board to the bottom 26 pin connector Plug the ribbon cable from J410 of the I O board to the 50 pin connector on the top front portion of the controller board as shown in Figure 6 29 Plug speaker USB multicolor cable from J220 of the I O board to J3 and J5 of the control
97. el select Display Select the Settings tab Set the Screen Area to 640 by 480 pixels Set the Colors to 16777216 colors From the Start menu select Control Panel In the Control Panel select Ports Click the Add button to add a COM Port You need COMI COMG3 and If COM3 and are not present add them If COM2 is configured delete it Configure COMI as follows Input Output Range 3F8 03FF Interrupt Request 10 Bits per second 9600 Data bits 8 Parity None Stop bits 1 Flow control None Configure COM3 as follows Input Output Range 03E8 03EF Interrupt Request 04 Bits per second 2400 Data bits 8 Parity None Stop bits 1 Flow control None Configure COM4 as follows Input Output Range 02E8 02EF Interrupt Request 03 Bits per second 9600 Data bits 8 Parity None Stop bits 1 Flow control None Restart the system RFA300A Measurement Set 8VSB Service Manual 6 55 Maintenance Install the Tektronix JPS Software Install the Soft Power Off Install the Intel EtherExpress PRO 100B 6 56 PCI Adapter Make sure that the RFA300A System and Application Restore Media CD ROM is in the CD ROM drive 1 wa fF From the Start menu E Drivers Tekjps Setup exe Click Next in the Choose Destination Directory dialog box Click Next to continue Check Yes I want to restart my computer now and click Finish Remove the CD ROM from the drive and restart the syst
98. em Make sure that the RFA300A System and Application Restore Media CD ROM is in the CD ROM drive 1 DEG cue mes OP Open a DOS window select MSDOS Prompt from the Start menu Go to e MDriversPowerOff Run regini jamshut ini Copy jamshut sys to c winnt system32 drivers Run regini jamsrv ini Copy jamsrv exe to c winnt system32 Remove the CD ROM from the drive and restart the system Make sure that the RFA300A System and Application Restore Media CD ROM is in the CD ROM drive 1 Copy e Drivers EtherExp to c Temp It is not possible to install the drivers directly from the CD ROM From the Start menu select Settings and then Control Panel In the Control Panel select Network and then select the Adapter tab If an adapter other than the Intel R PRO 100B PCI Adapter Tx is displayed remove the displayed adapter and add the correct adapter Click the Have Disk button and then click the Update button Specify the c Temp EtherExp directory as the driver location Specify the network configuration information such as the IP address for this RFA300A Measurement Set 8VSB on your network Consult your network administrator for network configuration information After installation completes remove the CD ROM and restart the system RFA300A Measurement Set 8VSB Service Manual Maintenance Install the Touch Base sure that the RFA3
99. emoving the Pilot Lock 1 Module 6 14 Remove the acquisition module refer to Removing the Acquisition Module on page 6 13 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 and gain access to the interconnection cables RFA300A Measurement Set 8VSB Service Manual Maintenance 4 Disconnect the following cables from the Pilot Lock module see Figure 6 5 for connector locations a Cable coupling connector between 170270 Clock cable label 7 and J0260 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 Pilot Signal cable label 2 to J2 of the down converter module d Cable coupling connector between J0460 Tune voltage cable label 6 and J0420 of the synthesizer module e J0480 86 MHz Clock to J4 Internal input of the down converter module not connected f J0580 258 3 MHz cable label 4 to the down converter module RF Input 2 Internal 14 5 Place the removed module on a static free work surface or in a static protection bag 10270 Clock cable label 7 to 10340 Acquisition Clock 0440 cable label 2 cable connector of the cable
100. entifies 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 tolerances Table 4 1 Required equipment list 8VSB Signal Source 10 mW to 1 W 10 dBm to 30 dBm FM Signal Generator Frequency range 174 MHz to Rohde amp Schwarz 806 MHz FM modulation 100 KHz 5 03 Signal Generator frequency deviation 80 kHz output amplitude 10 dBm to 30 dBm CW Signal Generator Frequency range 174 MHz to Marconi 2024 Signal 818 MHz modulated CW output Generator amplitude 0 dBM to 80 dBm Spectrum Analyzer 0 to 1 GHz with tracking generator Rohde amp Schwarz frequency accuracy better than 10 Hz FSEB20 30 Spectrum at 400 MHz Analyzer SWR Bridge 50 impedance N type connectors Wiltron 60NF50 N type barrel connector Connectors N type male to male MMC 8803B barrel adapter SWR 1 06 or better 50 Q coaxial cable Connectors N type male length 72 Tektronix part number inches 012 0114 00 Precision 50 Q coaxial Connectors BNC male length 36 Tektronix part number cable 2 ea inches 012 0482 00 RFA300A Measurement Set 8VSB Service Manual Performance Verification Table 4 1 Required equipment list cont 3 way power Connectors SMA female ktronix part number combiner divider 5 0565 00 Adapters 3 ea Connectors SMA male to BNC female ktronix part number 5 0554 00 Adapters 2 ea Connectors B
101. eplaceable 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 RFA300A Measurement Set 8VSB Service Manual 8 1 Replaceable Electrical Parts 8 2 RFA300A Measurement Set 8VSB Service Manual EEE OO Zl Diagrams This section provides two block diagrams of the RFA300A 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 RFA300A Measurement Set 8VSB Use the interconnection block diagram to determine cable connections when removing or replacing modules NOTE If you remove a module note the cable routing within the measurement set to help you reinstall the module and any interconnection cables that you remove RFA300A Measurement Set 8VSB Service Manual 9 1 Diagrams 9 2 RFA300A Measurement Set 8VSB Service Manual RF Input 4 50 OhmE xtemal Precision N
102. er 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 RFA300A measurement set system Tektronix technicians are apprised 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 warranty 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 RFA300A Measure ment 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 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
103. es of the instrument Exhaust is to the bottom and rear of the instrument 2 in 50 mm air space adjacent to the bottom of the instrument is required Rated for indoor use only 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 1524 m altitude Operating without damage 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 1524 m altitude With a floppy diskette media in the floppy drive the operating specification lower limitis 10 C 50 F Non operating 20 C to 60 C 4 F to 140 F 30 C 54 F hr max gradient non condensing Humidity Operating Non operating Altitude Operating Non Operating 1 14 20 to 80 relative humidity non condensing Max wet bulb temperature 31 C or 87 8 F at50 C or 122 F maximum relative humidity is 50 8 to 80 relative humidity non condensing Max wet bulb temperature 40 C or 104 F at 50 C or 122 F maximum relative humidity is 50 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 altitude 40 000 ft 12 190 m RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 8 Dynamics Characteristic Random Vibration Operating Non Operating Functional Shock Operating Description 0 27 gau total from 5
104. ess Update in the FracN board box and Lock Indicators box Verify that all four lock indicators are checked 9 d w DUM 15 Measure the 400 000 MHz signal using the spectrum analyzer The signal amplitude is low usually about 40 dBm 9 Check that the counter measurement frequency is greater than 399 997 500 Hz and less than 400 002 500 Hz If it is outside these limits perform the 0 MHz VCXO Frequency Adjustment starting on page 5 9 RFA300A Measurement Set 8VSB Service Manual 4 17 Performance Verification 86 1 MHz VCXO Frequency Check 4 18 10 11 12 13 Set the center frequency of the spectrum analyzer to 430 489 510 Hz Select the Hw Setting in the HWUI window 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 Push Cancel Select Synthesizer in the HWUI window Set LOLow Filter to the band associated with 21 52 MHz Example LOLow Filter 5 Set Coarse Tune to the value associated with 21 52 MHz Example Coarse Tune 100 Press the Coarse Tune button in the FracN Board box Push Ref Src to External 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 Measure th
105. f CD and floppy drive chassis Align CD drive mounting holes with chassis holes Teu cm Attach CD drive to chassis with the four crosstip screws Torque the screws to 2 in Ibs RFA300A Measurement Set 8VSB Service Manual Maintenance Figure 6 12 Chassis screw locations for the CD drive Remove the Floppy Disk Drive 1 Remove the three cross tip screw holding the floppy disk drive to the assembly 2 Lift the floppy disk drive up and off of the chassis as shown in Figure 6 13 Figure 6 13 Chassis screw locations for the floppy disk drive RFA300A Measurement Set 8VSB Service Manual 6 25 Maintenance Replace the Floppy Disk Drive 1 Place the replacement floppy drive onto the chassis CD drive as shown in Figure 6 13 Attach the floppy drive to chassis with three crosstip screws Torque each screw to 2 in Ibs Align the assembly with the slot in the chassis Slide the assembly most of the way into the compartment and install the CD cable Connect the CD drive cable to the CD drive connector adapter board Line up the attaching screw holes and install the three attaching screws two in the front and one in the rear of the assembly 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 14 Attach the floppy drive cable to the floppy drive
106. he chassis with two T15 screws Torque the screws to 8 in Ibs Plug the hard drive ribbon cable onto the controller board HD connector see Figure 6 17 Route and connect any other ribbon cables that were disconnected to remove the hard drive assembly Attach the top of the cable clamp on the hard drive mounting bracket Speaker Removal front bezel front panel display and key pad assembly must be uninstalled to remove the speaker for replacement 1 Speaker Replacement 1 Remove the front panel bezel refer to Removing the Bezel Trim Ring on page 6 9 for the removal procedure Remove the front panel interface circuit board cover refer to Removing the Flat Panel Display on page 6 20 Remove the key pad assembly refer to Removing the Key Pad Assembly on page 6 21 Note the routing of the speaker cable for reinstallation Disconnect the speaker connector from the front panel interface board see Figure 6 19 Remove the four T15 screws that attach the speaker to the chassis and remove the speaker from the chassis Route the speaker wire harness through the mainframe chassis hole as shown in Figure 6 18 Attach speaker to chassis with four T15 screws Torque the screws to 8 in Ibs Reconnect the speaker wire to the front panel interface board Speaker connector J980 see Figure 6 19 RFA300A Measurement Set 8VSB Service Manual 6 31 Maintenance Plug speaker connector here
107. he main loop is fairly wideband and provides the necessary control to minimize the phase noise generated by the high frequency local oscillators pcc 1050 1 105 42 Synthesizer Module ucro LO 1 UE 34 3 dB posu kon ontro indicator T eni 10 MHz Measurement 89 10 MHz Tune synth indicator y TN Hook Source Tune 4 Y 3t Ox lt k Band j2 8 sw 2 10MHz 12 48 VCXO Frac N Ref 500 829 MHz 4 2 Source 4 Select 1 Q P 552 10 2 Mid Synthesizer Clock 400 500 MHz 1 9 1 4B 5 8025 Synthesizer p i To Main Loop lt 20 MHz Synth TRA various gain 20 MHz circuit D LO ic y 20 MHz L Power controls 1 Tune Volts C ND id E Interface 410 dB n Power PCI amp AC control Interface l mano Tune y Main Lo Low 20 22 MHz Bus Volts Loop BW hook Tune Vols Y ots Loop BW has a 4 Interface 5 Figure 3 6 Synthesizer block diagram RFA300A Measurement Set 8VSB Service Manual 3 9 Theory of Operation Pilot Lock 3 10 The 20 MHz phase lock loop circuit uses a fractional N synthesizer and a 10 MHz VCXO voltage controlled crystal oscil
108. he 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 digitizer 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 3 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 shut down the main supply for a shorted output PCI Backplane PCI backplane supports the mainframe controller and up to 8 standard PCI modules and also accepts custom application modules The backplane connects the power supply output voltages to the remainder of the system including the fans and distributes the system clock All communications to from and between the system modules is supported Mainframe Controller DTI controller is a high pe
109. he protective bag The bag prevents dust moisture or other small packaging debris from entering the cabinet 4 Fold the top of the bag neatly over the top of the RFA300A to make it as flat as possible and seal with packing tape 5 Place the bagged RFA300A measurement set 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 RFA300A measurement set go in the larger rectangular holes The bezel end of the cabinet fits over the edge of the spacer pad RFA300A Measurement Set 8VSB Service Manual 6 61 Maintenance lt lt gt D 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 33 Placement of bottom spacer pad in inner shipping box 6 Place the other spacer pad on top of the RFA300A Again place the side with the small square holes against the side of the box The protective front cover on the bezel of the RFA300A 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 34 9 Place the sealed inner shipping box in the center of the bottom support insert in the outer shipping box 10 Put the second support insert over the inner shipping box
110. he tracking generator The trace indicates the open circuit reflected power Note its lowest point in dBm 5 Repeat steps 6 8 for both RF Inputs on the RFA300A use the Setup button to select Input 1 and then Input 2 RFA300A Measurement Set 8VSB Service Manual 4 19 Performance Verification 4 20 6 Connect the SWR bridge to the RF input of the RFA300A measurement set using a precision N type barrel connector for the shortest possible connection from the SWR bridge to the RF input connector 7 Single sweep the tracking generator again This time the trace indicates the reflected power from the input circuit of the RFA300A riding on the noise floor as shown in Figure 4 6 Open circuit reference line Return loss Input circuit reflected power Figure 4 6 Return loss calculation 8 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 6 9 Disconnect the test equipment RFA300A Measurement Set 8VSB Service Manual 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 1 2 Start the RFA300A application if it is not running If not in
111. hing the power supply to the chassis at either side of the line filter opening At the rear of the power supply attach the power supply to the chassis with two short screws and two long T15 screws 4 Plugin the backplane ribbon cable on the side of the power supply module 5 Plug the front panel ribbon cable onto the front of the power supply module CAUTION The power supply ribbon cable connector is difficult to fully plug on Make sure both retaining latches are fully closed over the connector housing RFA300A Measurement Set 8VSB Service Manual 6 37 Maintenance Controller Board Removal Use the following procedure to remove the controller board and Replacement 2 1 Remove the circuit board retaining plate see Figure 6 3 Remove the two T15 screws that hold the controller board to the mainframe chassis see Figure 6 23 for the screw locations Disconnect the controller board end of all six cables connecting the controller board with the I O board Disconnect the 4 pin multi colored cable from the control board Carefully pull up on the controller board to loosen it from the backplane connectors When the board is loose from the backplane connectors lift the assembly up and partially out of the module bay Disconnect the front panel interface CD drive and floppy drive cables Place the removed circuit board on a static free surface or in a protective anti static bag Reinstall the
112. i Slots 10 11 6 12 Backplane PCI and Power Buses RFA300A Measurement Set 8VSB Service Manual Replaceable Parts This section contains a list of the replaceable modules for the RFA300A Measurement Set 8VSB Use this list to identify and order replacement parts Parts Ordering Information 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 Instrument type or model number m 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 Module Servicing Modules can be serviced by selecting one of the following three options Contact your local Tektronix service center or representative for repair assistance Module Exchange In some cases you may exchange your module for a reman ufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program
113. iances Cont Category Standards or description Installation Overvoltage Category Terminals on this product may have different installation overvoltage category designations The installation categories are III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT Il Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipmentis usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment Pollution Degree Laser Classification 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 Products in this category are generally encapsulated hermetically sealed or located in Clean rooms Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Pollution Degree 2 Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conduct
114. ical leakage paths between conductors or components in a humid environment 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 RFA300A 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 75 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 Disc Drive CD ROM drive requires routine maintenance to operate at maximum efficiency Discs can be damaged if dirt and dust accumulate on the surface To prevent damage store discs in their protective containers when not in use ROM drive Do not touch either the lens or the exposed metallic parts on the CAUTION Electrostatic discharge ESD can damage components in
115. ice Manual Maintenance Additional Configuration 1 Set auto hide for the task bar as follows a b From the Start menu select Setting and then Taskbar Check Auto Hide Click OK 2 Configure automatic logon to allow the RFA300A to automatically log on when you start the system or reboot as follows a From the Start menu run E tools autologon exe where E is the CD ROM drive letter Enter the user name Administrator Enter the password RFA300A Click OK 3 Set the Event Viewer as follows a d From the Start menu select Programs Administrative tools and then Event Viewer From the Event Viewer Log menu select Log Settings Select Overwrite events as needed for the Application System and Security logs Exit the Event Viewer 4 Set the Microsoft Explorer options as follows a b d Open Microsoft Explorer Under View select Options Select Show all files Deselect Hide file extensions for known file types 5 Set boot initialization countdown as follows a b d From the Start menu select the Control Panel In the Control Panel double click the System icon Select Startup Shutdown tab Change the Showlist for to 3 seconds This completes the Software Installation Procedure RFA300A Measurement Set 8VSB Service Manual 6 59 Maintenance Repacking for Shipment If a instrument is to be shipped to a Tektronix field office for repa
116. ies 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 Whenever possible keep the component leads shorted together Pick up components by the body never by the leads Do not slide components over any surface uu A 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 instrument Check the electrical performance and verify the instrument accuracy once a year Preventive maintenance mainly consists of periodic cleaning Periodic cleaning reduces instrument breakdown and increases reliability Clean the instrument as needed based on the operating environment Clean the entire instrument often enough to prevent dust and dirt from accumu lating Dirt can act as a thermal insulating blanket that prevents effective heat dissipation In addition dust buildup can provide high resistance electr
117. ii RFA300A Measurement Set 8VSB Service Manual 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 product 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
118. indow 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 save your results to a database by doing the following 1 Goto the File menu and select Save Results As 2 Enter name destination and any notes you want saved with the results Results can be printed or exported to other applications using the Report dialog box selected in the File menu You can also recall results for further study at any time RFA300A Measurement Set 8VSB Service Manual 2 15 Operating Basics Signal Monitor 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 1 Open the Signal Monitor window Click Setup in the Toolbar Select the measurements you want to monitor Select how often you want your results to be automatically saved or select Off to disable the 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 in the online help 6 Se
119. intenance Removal and Replacement Instructions 6 8 Replaceable Modules Recommended Tools The following procedures tell you how to remove and replace modules Part numbers for the modules are in the Replaceable Parts List The modules are in the mainframe card bay in compliance with the EISA standard The standard measurement set contains the following replaceable modules Down converter module Synthesizer module Pilot lock module Acquisition A D module The mainframe unit contains the following replaceable components Processor module controller board Front panel interface module Disk drive Power supply module Front panel keypad module Flat panel display Floppy disk drive CDROM drive assembly CDROM drive Cooling fans The following tools are recommended An anti static wrist strap for safe handling of assemblies containing static sensitive devices A screwdriver with T10 T15 and T20 Torx tips to remove the cabinet cover and the module mounting screws A 1 4 inch or larger flat tip screwdriver An 8 inch adjustable wrench or appropriate size open end wrench an aid for cabinet removal Smooth jaw pliers example KLEIN D306 51 2C RFA300A Measurement Set 8VSB Service Manual Maintenance Removing Remove the bezel trim ring to permit removal of the the key pad assembly the the Bezel Trim Ring interface circuit board and the CD floppy disk drive assembly The front bezel snaps off of the
120. ions Server Diagnostics 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 Before removing the covers from the server read Handling Static Sensitive Components CAUTION To prevent damage from static discharge service the product only in a 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 Handling Static Sensitive Components This instrument contains electrical components that are susceptible to damage from static discharge Static voltages from 1 kV to 30 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 EC 770 5007420000000 Shottky Signal Diodes 250V Shottky TTL 500 V HF Bipolar Transistors 400 V 600 V J FETs 600 V 800 V Linear Microcircuits 400 V 1000 V Low Power Schottky TTL 900 V TTL 1200 V RFA300A 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 assembl
121. ir attach a tag to the instrument showing the following W Owner s name and address Serial number Description of the problem s encountered and or service required The measurement sets are shipped in cartons designed to provide maximum protection If you ship the instrument subsequently you will need to use these cartons spacer pads protective bag and instrument support inserts to provide adequate protection NOTE The RFA300A 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 REA300A 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 Packaging 6 60 New packaging material is available from Tektronix The part numbers are in Table 6 3 and in the Replaceable Mechanical Parts List in the service manual Packaging components are shown in Figure 6 34 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 keyboard 004 4851 00 Accessory tray 004 4852 00 Spacer pad makes two pads for 004 4925 01 inner shipping box Anti static pouch 006 2427 01
122. ist of offices xiv RFA300A Measurement Set 8VSB Service Manual Introduction Before You Begin Service Strategy This manual contains maintenance information for the RFA300A Measurement Set 8VSB Read this short introduction repairing or servicing the instrument This manual is for servicing the RFA300A Measurement Set 8VSB To prevent injury to yourself or damage to the measurement set fulfill the following requirements before you service the instrument Wm Be sure you are qualified to service this equipment m Read the Safety Summary at the beginning of this manual m Read Service Strategy in this section When using this manual to service your RFA300A measurement set system be sure to heed all warning cautions and notes 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 If you isolate a problem to a specific module use the Replaceable Parts List at the end of this manual to determine the replacement module part number to order from Tektronix RFA300A Measurement Set 8VSB Service Manual XV Introduction Tektronix Service Offerings Warranty Repair Service Repair Service Self Service xvi Tektronix provides service to cover repair under warranty Other services are available that may provide a cost effective solution to your service needs Wheth
123. ive 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 This product contains a CD ROM drive which utilizes a Class 1 laser and complies with EN60825 1 94 and with the U S FDA regulations The drive is marked with the laser s Classification and date of manufacture as well as the following information Complies with the DHHS rules 21 CFR Chapter 1 Subchapter applicable at the date of manufacture Safety standards Safety Certification Compliance Temperature operating 5 to 450 C Altitude maximum 2000 meters operating Equipment Type Test and measuring Safety Class Class 1 as defined in IEC 1010 1 Annex H grounded product Installation Overvoltage Category Overvoltage Category Il as defined in IEC 1010 1 Annex J Pollution Degree 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 RFA300A Measurement Set 8VSB Service Manual 1 17 Specifications Mechanical Physical Characteristics Table 1 11 Mechanical characteristics
124. lator to control the frequency of the 20 MHz oscillator This loop circuit 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 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 A block diagram of the pilot lock module is shown in Figure 3 7 Pilot Lock Module 3 Q Signal 4 Pilot Preset Signall E a 1 Pilot Lock Detect F SR Pilot Loop gain Pilot Lock i x signal C rt Clam RS s Volts 10 76 MHz RO on Clock 1 on 524 Digitizer
125. le direct conversion mixer stage introduces less linear distortion than a multiple conversion receiver Ext RF Ext RF Input 1 Input 2 4 9 943 Down Converter Module A 28 8 10dB v 10 dB 1501748 Narrow BW gt ROL Narrow 5W 5W Narrow BW 0 5 dB steps Narrow BW select rw BW select NX 27 select Digitizer select iu ag 100MHz 2 O pa 2 25 dB lt lt ie SJ p D Pre Narrow dBm 9 227 BandGain 1 5 0 17 dB 0 5 Q 0 A dB steps E jl Input RF dB gt Ay 9 1 Ay 4 select Attenuator s LO 7 CX Signal amplitude v Present 7 dB 14 dB 12 6 wo approximately 7 dB Broad Band Gain rw greater at Pilot 10 76 MHz frequency CW gt gt Pilot 10 76 MHz To various circuit 250 kHz BW ey gt controls 12 dB m Interna 0 10 20 uc 164 800 MH Precision N 2 MHz MHz Power Interface 12C Control Interface 13 dBm Max pnl 4 3 dB 1 Mi Figure 3 4 Down converter module block diagram RFA300A Measurement Set 8VSB Service Manual 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 Theory of Operation Digitizer IF from down converter
126. le device CD ROM hard drive and then network boot m Exit with Save Settings Restore BIOS settings reprogram the CMOS to the custom factory settings for the BIOS from the CD ROM perform the following steps 1 Power up the RFA300A Measurement Set 8VSB with the RFA300A System and Application Restore Media CD ROM in the CD ROM drive 2 Enter Restbios bat at the DOS prompt The BIOS settings will be reset To manually configure the BIOS settings refer to the RFA300A Measurement Set SVSB Service Manual for settings and instructions RFA300A Measurement Set 8VSB Service Manual 6 51 Maintenance Restore the Contents of the Partitions 6 52 Easy Restore Partition 1 A In some situations such as when the power has been interrupted or files were mistakenly deleted the RFA300A may fail to boot from the hard drive If this happens use the RFA300A System and Application Restore Media CD ROM to restore the hard drive to factory default installation status The RFA300A Measurement Set 8VSB contains one IDE hard drive with two partitions The first partition used for the RFA300A system is approximately 2000 MB and is formatted with the FAT format The second partition uses all of the remaining space on the hard drive and is formatted with NTFS To restore the contents of partition 1 only NT system and RFA300A applica tion use the following steps This restore process is effective only if the hard drive
127. lect 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 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 10 Click OK to close 11 Click the Setup s OK button to apply your selections and return to the Signal Monitor window 2 16 RFA300A Measurement Set 8VSB Service Manual Operating Basics Online Help Help Topics What s This Help The online help gives detailed information about the operation of the RFA300A 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 9 Yew Setup Took window w a 7 7 an sej P LL el Click for Topic help Click for What s This help on selected object Figure 2 9 Help menu Help topics tell you how to perform ta
128. ler board as shown in Figure 6 30 Note that the brown wire is on the right on the I O board and on the left on the controller board RFA300A Measurement Set 8VSB Service Manual Maintenance ugs onto ee nnector 410 cable plugs Figure 6 29 I O to controller board flat panel interconnection RFA300A Measurement Set 8VSB Service Manual 6 45 Maintenance Brown wire connects to pin 1 100 pin ribbon cable routes through this slot ES 1 0 board 100 pin N ribbon cable Figure 6 31 IDE hard drive cable to I O circuit board 6 46 RFA300A Measurement Set 8VSB Service Manual Maintenance Backplane Circuit remove the backplane you must first remove the power supply and all of the Board Removal plug in circuit boards 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 36 Remove the circuit board retaining plate Remove all the plug in modules from the card bay see the RFA300A module removal instructions starting with RFA300A Application Modules on page 6 12 Disconnect the RS232 cable connector from the backplane circuit board Remove the 15 screws holding the backplane board assembly to the chassis with a T15 screw tip screwdriver see Figure 6 32 for the screw locations Lift the back plane board assembly out of
129. les and user data files for restoration After testing you need to remove the testing software from the RFA300A measure ment set to prevent its inadvertent use in normal operation of the product When you uninstall the testing software the user setup files and user data files are restored Perform the procedure once every 12 months of operation to ensure that the performance is within tolerance The RFA300A measurement set is limited to situations where a single high am plitude SVSB RF signal is available for direct input to the measurement set RFA300A Measurement Set 8VSB Service Manual 4 1 Performance Verification Equipment Required 4 2 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 and you allowed a minimum warm up time of 20 minutes 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 id
130. lity specifications The rear panel provides two RF input connectors for your transmitted signal Refer to Figures 2 1 and 2 2 to connect the RFA300A measurement set to your transmitter and for other connections RFA300A Measurement Set 8VSB Service Manual Getting Started Transmitter Channel filter Power input RFA300A Figure 2 1 Transmitter connection Connect the RFA300A measurement set to your transmitter in a manner that ensures the instrument will receive only one channel If the input signal strength is more than 1 watt install the external 10 dB attenuator the input signal strength cannot be more than 2 watts NOTE Power to the measurement set must be within the following ranges gt 1 mW and lt 1 W without the external 10 dB attenuator gt 10 mW and less 2W with the external 10 dB attenuator installed Interface Connections The interface connectors on the rear and side of the measurement set shown in Figure 2 2 and Figure 2 3 provide the interconnection ports for peripheral devices and networking Pin assignments for the rear panel and side panel connectors are listed in Table 1 4 and Table 1 5 in Specifications RFA300A Measurement Set 8VSB Service Manual 2 3 Getting Started Ethernet Parallel Power Alarm SVGA Port Port
131. lume 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 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 sound from both headphones Check the stereo balance control using the following procedure a Click on CD Player and then click on Volume Control b Shiftthe volume control balance lever to full right and verify that only the right headphone has sound c Shiftthe volume control balance lever to full left and verify that only the left headphone has sound Shift the volume control balance lever back to the center position Point to and select the box to close the Volume Control window In the taskbar click on the CD Player task label In the CD Player window click on Disc and select Exit Select Exit to close the CD Player window Remove the CD disc from the CD drive Close the CD drive drawer Disconnect the headphones from the headphone jack RFA300A Measurement Set 8VSB Service Manual 4 11 Performance Verification RFA300A Operational Checks 4 12 Load the Performance Verificatio
132. mitter Adjacent Channels x 50 dB Analog lt 50 dB Digital This specification is the allowable signal amplitude of TV signals other than the one the RFA300A 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 RFA300A Measurement Set 8VSB Service Manual Specifications F sym 0 00 F lt Eme 1 y F f F pior 0 3 1 sin 2 Fuse F pior lt lt F rites Fs F symbo 1 gt E ut lt lt m 2 H F x F sym s 1 F symbol a F symbol a 2 1 sin 2z ET 2 1 4 lt F lt Fria 2 1 Esm 0 gt i 4 lt lt o Where en 22 5 10 10 762 238 MHz 30 Hz 715 Perform all calculations using the nominal value qu OME ij 150088 F symbol Figure 1 1 IF filter characteristics RFA300A Measurement Set 8VSB Service 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 such as noise and distortion products Data is taken only from the I channel that is the real axis in phase with the pilot ateach symbol time gt
133. module is located in the bottom compartment of the mainframe chassis down converter circuit board You can break the component leads to the circuit WARNING Do not pull on or twist the heat sinks located near the center of the board 3 Disconnect the interconnection coaxial cables from the down converter module see Figure 6 8 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 RFA300A Measurement Set 8VSB Service Manual 6 17 Maintenance c J3 LO input cable label 3 to J3 of the synthesizer module d J4 internal input cable label 4 to J0580 of the pilot lock module e J24 data to the synthesizer module J7 f J5 power connector J 2 Pilot signal cable J 3L0 Signal cable label 2 to 0440 of the label 3 to J 0460 of the Pilot Lock module Synthesizer board 36 J28 WARNING Do not twist or pull on these heat sinks n J6 O J4 e J 1 IF Signal cable 24 Data label 1 to J 4 of the Power 29 Fan Secondary Input power cable label 4 to 0580 ofthe Pilot Lock module Acquisition module Figure 6 8 Connector locations on the down converter module 4 Remove the eight screws holding the down converter assembly to the mainframe chassis 5 Reinstalling the Down Position the mainframe with the left
134. n Software The following operational checks for the RFA300A 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 and 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 assure the best operation of the range of channels The performance verification software contains programs used for the perfor mance verification and adjustment procedures Load the software using the following steps 1 Ifthe RFA300A application is running exit the application File Exit 2 Insert the RFA300A 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 The Performance Verification testing software will start to install 5 Select all default install options for the installation 6 After installation completes open the RFA300A PV folder on the desktop Shortcut icons to the test programs are assembled in the folder for ease of
135. n page 4 4 and use it to record the test results for the Performance Verification procedure RFA300A Measurement Set 8VSB Service Manual 4 13 Performance Verification 4 14 Test Procedure An ROG 10 12 13 From the Home window click on the Signal Noise Error Vector Magnitude Pilot Amplitude Error icon In the toolbar set Smoothing to High Check that Signal Noise is greater than 40 dB Check that EVM is less than 1 Check that Complex MER is greater than 40 dB From the Home window click on the Frequency Response Group Delay icon In the toolbar note the current Smoothing selection then set Smoothing to High Check that Freq Resp peak to peak is less than 0 25 dB Check that Group Delay peak to peak is less than 8 ns In the toolbar restore Smoothing to the previous setting then click on Home From the Home window click on the Phase Noise icon In the toolbar set Smoothing to High Wait two minutes for smoothing to be fully effective 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 RFA300A operational checks perform the Normalize the RFA300A procedure starting on page 5 2 in the Adjustment Procedure section RFA300A Measurement Set 8VSB Service Manual Performance Verification LO LOW Resonator Check The purpose of the LO LOW resonator check is to verify that the resonator is properl
136. nt 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 NOTE Several of the measurements take some time to complete 4 Repeat the same procedure for each of the following measurements you must select some of the measurement graphs using the selection tabs Amplitude Error and Phase Error Out of Channel Emissions Peak to Average Ratio and Channel Spectrum select tab Phase Noise Error Vector 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 RFA300A application RFA300A Measurement Set 8VSB Service Manual 4 9 Performance Verification Touch Screen Test NOTE 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 the top bottom sides and corners of the display verifying that the arrow cursor moves to each location touched in approximately one second b 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 menu by clicking the Start icon c Deselect the Windows menu by touching the top right corner of the display 2 Verify touch screen uniformity The cursor arrow
137. o the Front Panel Interface Board 1 10 RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 5 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 uses a 25 pin D connector Compliant with IEEE P 1284 DB25 for bi directional Parallel Peripheral Interface for Personal Computers 1284 1994 IEEE Pin assignments for compatible mode 1 SRTB 2 DATAO DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 10 ACK 11 BUSY 12 PMT 13 SEL C Ul A w 14 AUTOFEED 15 ERR 16 INIT 17 SELIN 18 GND 19 GND 20 GND 21 GND 22 GND 23 GND 24 GND 25 GND See IEEE P1284 A in IEEE Standard 1284 1994 for pin connection definitions for other modes Serial Interface Port on back panel 9 pin male D sub connector RS232 Pin Assignments 1 DCD 2 RXD 3 TXD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI RFA300A Measurement Set 8VSB Service Manual Specifications Table 1 5 Rear panel interface characteristics Cont Characteristic SVGA Output P ort Ethernet P ort Alarm Contacts 1 12 Description 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
138. oard 1 Remove the two 15 screws that hold the I O board to the mainframe chassis one on top and the other in the rear panel similar to the position shown for the controller board in Figure 6 23 Disconnect the two 10 pin connectors from J290 and J190 on the I O circuit board from the controller board Disconnect the 26 pin connector from J170 on the I O circuit board from the bottom 26 pin connector on the controller board Disconnect the cables from J271 J260 J410 and J220 on the controller board Carefully pull up on the I O board to loosen it from the backplane connec tors When the board is loose from the backplane connectors lift the assembly up to gain access to the remaining interconnection cables Disconnect the CD drive ribbon cable from J250 of the I O circuit board See Figure 6 25 Disconnect the IDE hard drive ribbon cable from J150 on the I O board See Figure 6 24 Disconnect the front panel ribbon cable from JR1 on the I O board See Figure 6 25 RFA300A Measurement Set 8VSB Service Manual Maintenance IDE hard drive ribbon cable EAM plugs onto 150 IDE hard drive ribbon cable Figure 6 24 IDE hard drive ribbon cable connects to the I O board RFA300A Measurement Set 8VSB Service Manual 6 41 Maintenance Front Panel ribbon cable connector CD Drive ribbon cable plugs onto J 250 1 0 Circuit board with cables installed Figure 6 25 Insert I O boa
139. ocedure 4 Remove the key pad assembly refer to Removing the Key Pad Assembly on page 6 21 for the removal procedure 5 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 of the chassis RFA300A Measurement Set 8VSB Service Manual 6 23 Maintenance Removing and Replacing the CD Drive or Floppy 6 24 Disk Drive 6 Disconnect the floppy drive cable from the floppy drive connector as follows 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 4 pin audio cable and the CD drive cable see Figure 6 14 from the controller board 8 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 9 Carefully disconnect the CD drive cable from the CD drive connector adapter board The floppy disk drive and the CD drive are assembled in the same unit but can be separately replaced Remove the CD Drive 1 Remove the four cross tip screws that hold the CD drive to the chassis 2 Slide the CD drive out of the lower bay of the CD and floppy drive chassis Replace the CD Drive 1 Install the CD connector adaptor board Insert CD drive into lower bay o
140. on how to use the soft keyboard select My T Soft Welcome from the My T Soft program group in Programs in the Windows startup menu Licensing If the RFA300A software is correctly installed the first time you use the soft keyboard the My T Soft keyboard registers itself If the RFA300A is not installed the My T Soft keyboard will be loaded as a demo version To undo this uninstall the My T Soft keyboard properly install the RFA300A software and then reinstall the keyboard To display the license status select Licensing from the My T Soft program group from Programs in the Start Up menu NOTE The My T Soft keyboard must be installed on the same drive letter as the RFA300A software RFA300A Measurement Set 8VSB Service Manual Operating Basics Home Window Menus Toolbar The Home Window is the point of entry into the RFA300A measurement set From 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 Figure 2 6 Home Window Menu selections are available from any measurement window and the Signal Monitor window Refer to the RFA300A measurement set online help for a descrip tion of each menu selection All toolbar selections are available from any m
141. onality of the measurement set If a failure is detected the Power on diagnostics dialog box opens with the failed test indicated 1 Start the RFA300A 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 RFA300A measurement set fails to boot up correctly refer the problem to a qualified service person 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 Modules and Test Select One Time and click Run Check that all the tests pass Me gm 9219 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 RFA300A Measurement Set 8VSB Service Manual 4 7 Performance Verification Verify Input Signal Power 4 8 The inp
142. onnector as shown in Figure 6 21 9 Connect the disk drive flexible circuit board to the interface board disk drive connector Fan connectors Speaker connector Figure 6 21 Cut away view showing wire routing of fan and speaker wires 10 Connect the ribbon cable connector from the controller I O to the interface board controller connector 11 Connect the CD stereo cable 12 Connect the power supply cable 13 Connect the ribbon cable connector from the key pad assembly to the interface board 14 Reinstall the interface circuit board cover assembly RFA300A Measurement Set 8VSB Service Manual 6 35 Maintenance Power Supply Removal Use the following steps to remove the power supply module and Replacement 1 Power down the mainframe and unplug the power cord 2 Remove the cabinet refer to Removing the Cabinet on page 6 9 3 Remove the key pad assembly refer to Removing the Key Pad Assembly on page 6 21 4 Remove the five short and two long T15 screws that attach the power supply module to the chassis see Figure 6 22 for the screw locations a At the front of the power supply module remove one short T15 screw Use a long shafted screwdriver to access the front screw through the hole in the chassis b At the top of the power supply remove two short T15 screws c
143. ontacts face toward floppy drive CDROM Interface board CDROM Audio connector connector Figure 6 14 Connecting the Floppy disk and CD ROM drive assembly cables RFA300A Measurement Set 8VSB Service Manual 6 27 Maintenance Removing the Hard Disk Drive Install the Hard Drive to the Bracket Assembly 6 28 The disk drive is installed in the mainframe immediately behind the flat panel display on the left side of the mainframe The mainframe cabinet must be removed to access the disk drive assembly 1 Wear a static grounding wrist strap 2 Power down the mainframe and unplug the power cord 3 Remove the mainframe cabinet see Removing the Cabinet on page 6 9 for the removal procedure 4 Disconnect the ribbon cable from the top of the hard disk drive 5 Remove two attaching screws from the top of the hard drive mounting assembly 6 Disconnect ribbon cables from the front panel interface board as needed to free the hard drive assembly from the mainframe 7 Liftthe disk drive assembly straight up out of the mainframe 8 Place the drive on a static free work area Wear a static grounding wrist strap when handling the disk drive Top mounting tab di p d ee LAG 2x ET d Hard drive 8 connector ae Pd d F s D Le 2 i pd 14 P UP Q 228 o A 9 20 see di Le p
144. ore icon RFA300A Measurement Set 8VSB Service Manual 5 11 Adjustment Procedure 5 12 4 In the RFA300A Mfg Config Setup window Are you sure you want to configure cleanup the instrument for shipment Click Yes 5 Important In the Mfg Configuration 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 colors etc that were saved at the beginning of this procedure are now all restored 7 Verify that the RFA300A PV folder is removed from the desktop 8 Remove the RFA300A 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 RFA300A application if it does not start automatically 11 Verify that RFA300A application starts as it should and that the Tek Only menu item is removed from the RFA300A menu bar 12 Exit the RFA300A application and shut down the computer using the Shut down the computer selection in the Start menu 13 Turn off the power switch This is the end of the adjustment procedure RFA300A Measurement Set SVSB Service Manual Maintenance This section provides service information about the following topics Handling Static Sensitive Components Cleaning and Inspection Removal and Replace ment Instruct
145. ork Netbeui protocol and Network TCP IP printing service ES1869 Sound Driver Chip and Technology 69000 Display Driver m Tektronix JPS software m Windows NT Service Pack 5 m Intel EtherExpress PRO 100B PCI Adapter Driver m Touch Base SC3 Touch Screen Driver m My T Soft NT soft keyboard m Microsoft ODBC W Microsoft Data Access Object m Tektronix RFA300A Measurement Set 8VSB application software 6 50 RFA300A Measurement Set 8VSB Service Manual Maintenance Restore the BIOS Settings CAUTION The RFA300A Measurement Set 8VSB is programmed with custom BIOS settings choosing any other settings will cause instrument malfunction Do not use the setup defaults of the BIOS manufacturer The RFA300A System and Application Restore Media CD ROM contains a utility CMOS NVRAM read write program and a factory customized BIOS image When the RFA300A Measurement Set 8VSB is booted from the CD ROM the readme txt file will display instructions Boot Options RFA300A Measurement Set 8VSB is set at the factory to boot from a removable device CD ROM hard drive and then network If this has been changed you must reset the boot options before you can restore the BIOS settings from the CD ROM To reset the boot options perform the following procedure m Reboot the RFA300A Measurement Set 8VSB Press F2 to enter BIOS setup when prompted on system startup m Go to the BOOT OPTIONS m Change the BOOT ORDER to removab
146. ower 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 The System Bus contains three sub busses plus other signal wires W Power Sub Bus which carries power and ground to the applications modules m Control Sub Bus a PCI bus m Communications Sub Bus which provides the intermodule connections m Audio Bus which lets you route an audio signal generated on any Applica tion Module to the Internal Speaker and the Headphone Jack Other Signals such as trigger signals supplies for local regulation by application modules and a serial bus for a simple processor interface RFA300A Measurement Set 8VSB Service Manual 3 1 Theory of Operation
147. part of the display assembly provides the backlight high voltage 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 with 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 disc 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 RFA300A Measurement Set Functional Description 3 4 Simplified Block Description The RFA300A measurement set application consists of three plug in modules and one bolted in module in a mainframe platform A simplified block diagram of the module
148. ption Outof channel emissions are spectral power versus frequency measurements similar to those made by a spectrum analyzer FCC Outof Channel Emissions Standard as referenced to MM Docket No 87 268 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 frequency difference in MHz from the edge of the channel All attenuation limits are based on a measurement bandwidth of 500 kHz The 8 VSB Transmitter Emissions Mask for the measurements is shown in Figure 1 2 This mask lowers the power radiated in the adjacent channel to a level of 44 dB below the average power transmitted Other measurement bandwidths may be used as long as the appropriate correction factors are applied In the event interference is caused to any service greater attenuation may be required gt 71 dBpry is dB as defined by the FCC s measurement method 2 dB over a range of 12 MHz with respectto the edges ofthe channel in use 3 dB Shows the integrated power present in the upper and lower adjacent channels Plots the deviation of
149. r 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 peri 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 PE Button Backspace key RFA300A Measurement Set 8VSB Service Manual Operating Basics Table 2 2 Front panel key controls Cont Control name Description Button Button with LED Control key LED indicates when keypad is in control mode Enter key Ctrl Refer to Table 2 3 for a list of control functions sticky key feature 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
150. ration NOTE If you are restoring software after replacing the hard disk drive with one you ordered as a replacement from Tektronix follow the instructions provided with the hard disk drive replacement If you are restoring software after reformatting the hard drive perform all of the procedures in this section in sequence Overview These procedures require the RFA300A System and Application Restore Media CD ROM which was shipped with the RFA300A Measurement Set 8VSB Installation should only be performed by a qualified technician who is familiar with installing drivers and configuring for networking These tips apply to the procedures in this section W Use default settings unless otherwise indicated in the following procedures These procedures use drive e as the CD ROM drive m At the end of some steps you are instructed to restart the system To do this if you are prompted to restart select Yes If not prompted select Shutdown from the Start menu and then select Restart the computer You can use the procedures in this section to do any of the following Restore the system BIOS settings to factory defaults Restore a part of the system m Restore the complete system including installation and configuration to factory defaults RFA300A Measurement Set 8VSB Service Manual 6 49 Maintenance The complete system includes m Microsoft Windows NT 4 0 m Automatic logon for Windows NT 4 0 m Netw
151. rd into slot 12 Reinstall the 1 0 Board Use the following steps to insert the I O circuit board into the slot 12 position in the mainframe card bay 1 Dress the controller board cables so that you can insert the I O circuit board into the first slot on the right as you face the rear panel 2 Insert the I O board into the slot Align the front end of the circuit board with the guide rail on the front of the card bay 3 Lower the I O board into the mainframe slot but do not press the board into the backplane connector yet 4 Reconnect the cables that connect the I O board with the controller board Refer to Connect I O Board to Controller Board on page 6 44 for connection sequence 5 Route the CD drive ribbon cable over the I O board 6 42 RFA300A Measurement Set 8VSB Service Manual 6 Lift the I O board and with one hand bracing the circuit board on the backside plug the CD drive ribbon cable onto J250 of the I O board as shown in Flgure 6 25 7 Plug the IDE hard drive cable into J150 on the I O board as shown in FIgure 6 24 8 Plug the front panel ribbon cable to JR1 of the I O board as shown Flgure 6 25 9 Place your fingers on the top of the I O board at the locations indicated in Figure 6 26 directly over the J11 backplane connector and press down to seat the board into the backplane connector 10 Reinstall the screws that were removed in step 1 of the I O board removal proc
152. rement 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 2 3 4 a 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 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 Push NvSave to save the new DAC value Push Cancel This does not cancel the value saved in step 5 When the Done dialog box appears select OK HwUi 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 RFA300A Measurement Set 8VSB Service Manual 5 9 Adjustment Procedure 86 1 MHz VCXO Frequency Check 86 1 MHz VCXO Frequency Adjustment 5 10 10 11 Set the center frequency of the spectrum analyzer to 430 489 510 Hz In the Hwui window select the Hw Setting menu Scroll down the list of LO LOW band data to find the LO LOW band number and the DAC value associated
153. rformance PC based controller that includes SVGA graphics and I O circuitry The Internal controller mounts vertically at the left of the mainframe card cage and connects into the PCI backplane through a standard 32 bit PCI connector A 64 bit PCI connector is used for additional I O communication to the backplane Interconnection to other instrument compo nents and rear panel ports is through a Processor I O board Front Panel Interface front panel interface assembly connects the system controller with the floppy disk drive the CD drive and the mouse keyboard and external USB universal serial bus ports The PC speaker audio is also routed from the controller to the speaker through the front panel interface circuit board The mainframe user interface components display touch panel and key pad assembly are also routed through the front panel interface assembly 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 RFA300A Measurement Set 8VSB Service Manual 3 3 Theory of Operation Touch Panel Hard Disk Drive Floppy Disk Drive CD Drive Mouse and Keyboard Ports backlight can be dimmed to 60 of its maximum brightness with a custom screen saver or mainframe utilities applet A DC switching regulator board included as
154. rter is clocked at 43 048 MHz A pilot lock system tunes the pilot of the IF signal to 10 76 MHz The pilot signal is tuned by varying the frequency 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 digitizer module digitizes the IF signal applied from the down converter at four times the pilot IF the symbol frequency rate Local memory in the digitizer module holds the digitized signal until it is accessed by the mainframe CPU The system CPU under control of the RFA300A measurement set application software programming demodulates the digitized 8VSB signal and measures the signal characteristics Down Converter Module NamowBandChamel E Digitizer Module 5 W 10 dB RF Inputa G 1 00 gt 1252 1 9 ie n ed __ E gt Memon Pass Filter O RF Input 2 a Z Mani 5 W 10 dB ainframe Power and PCI Shielded Aluminum Control Interface Card ER are _______ it Power and Broadband 43 MHz LO Signa Y 44 Control IF Signal Clock y t 219 Clock
155. s and the signal interconnection is shown in Figure 3 2 The down converter module is a shielded RF assembly in the mainframe lower compartment The input to this module is either RF Input 1 or RF Input 2 as selected in the System page of the Instrument Setup window The down converter attenuates and down converts the input signal from the 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 digitizer module A D converter Software control during the sweep makes up for RFA300A Measurement Set 8VSB Service Manual Theory of Operation 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 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 RFA300A measurement set a multiple of four is used Therefore the digitizer A D conve
156. s highlighted in Figure 4 3 light up during boot If there is doubt about whether or not any of the buttons light up during boot up push the On Stby button as many times as required to check the lights RFA300A Measurement Set 8VSB Service Manual 4 5 Performance Verification NOTE The On Stby button must be pressed before Windows NT begins to load Possible error messages may appear if the measurement set is turned off while Windows NT programs are loading 6 While the measurement set is loading Windows NT check that the two green colored LEDs STBY and HDD located at the lower left corner of the front panel are operating Figure 4 3 Front panel keypad showing highlighted buttons in gray 7 Listen for a short tune sounds played by the measurement set speaker 8 Wait for the instrument to complete the power on self tests and start Windows 4 6 RFA300A Measurement Set 8VSB Service Manual Performance Verification Functional Verification Procedure Extended Diagnostics NOTE The RFA300A measurement set can be configured to start up the RFA300A 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 measurement set The power on diagnostic tests are done during the power on process These tests check the basic functi
157. se Noise Description 5 dB x 105 dBc Hz at 20 kHz carrier offset This is the single sideband noise exhibited by the RFA300A local oscillator Residual Phase J lt 5 milliradians RMS integrated over the range from 2 kHz to 300 kHz Peak to Average Ratio Marker Accuracy 1 0 dBp 20 dBp 30 dBp 40 dBp 50 dBp 60 dBp 70 dBp 80 dBp 90 dBp The reference amplitude is the total transmitter output power including the pilot signal dBpry is dB as defined by the FCC s measurement method Out of channel measurements are referenced to a 500 kHz noise bandwidth RFA300A measurement Capability is limited to less than the 5 specification The FCC s specification continues down to 110 dB below total carrier output Next lower adjacent Lower adjacent channel N 1 channel N 2 In channel N Figure 1 2 8VSB transmitter emissions mask 1 8 Y Upper adjacent channel 1 Next Upper adjacent channel N 2 RFA300A Measurement Set 8VSB Service Manual Specifications System Components Table 1 3 System components Characteristic Mainframe Form Factor Processor Description Tektronix manufactured common platform mainframe Rack mountable in standard 19 inch rack Two 400 MHz Pentium II processors System Memory 256 MB Real Time Clock Real time clock calendar with a re
158. see Figure 4 9 Use the zoom feature to better position the cursor at the peak Record the reading see the RFA300A test record form on page 4 4 fux AFA Dut a Edt Yew Det Toole Window SEE Setup Soon i OL 5 we it nf Char ba Lower Channel Upper Channel B 8 dB Adimcent Cheersesl Mack Test Peas Lumen 3 28 3H 21228 FM Tektronix Figure 4 9 Out of Channel measurement accuracy test showing initial second tone amplitude 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 24 RFA300A Measurement Set 8VSB Service Manual Performance Verification 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 10 see the following NOTE Record the cursor readings at each step and calculate the difference for each step NOTE For each step change 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 Se AFA JMA Dui al Channel E mirtimi Si El Ede Yew Setup
159. side down and the bottom of the chassis 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 6 18 RFA300A Measurement Set 8VSB Service Manual Maintenance 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 8 for the connector locations 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 f J5 power connector Reinstalling a PCI Module 1 Insert the module into the card cage at the correct slot position correct slot numbers are shown in Figure 9 2 2 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
160. sizer board 200 Data 0420 10620 0720 0920 Synthesizer board Frac N board 0420 10 MHz Tune cable label 6 to 0620 Clock 1 cable label 7 to cable connector coupling between cable connector coupling between the the Synthesizer module and J 0460 of Synthesizer module and J 0270 of the the Pilot Lock module Pilot Lock module 0920 FRACN LO to J 0262 of the Synthesizer board Figure 6 6 Synthesizer module Frac N board cable connections 6 16 RFA300A Measurement Set 8VSB Service Manual Maintenance 5 Disconnect 10460 cable label 3 the LO signal 1 output to J3 of the down converter module LO input from the synthesizer module 0260 FRAC N LO to J 0920 of the Frac N board board C 10380 10260 gt 0460 10480 10560 NNN f J 0380 LO Low signal to J 0570 0460 LO signal 1 out of the Frac N board board cable label 3 to J 3 of the Down Converter module Figure 6 7 Synthesizer module connector locations 6 Place the removed module on a static free work surface Removing the Down 1 Disconnect the external signal cable from the Down Converter assembly Converter Module Remove the mainframe cabinet see Removing the Cabinet on page 6 9 for the removal procedure The down converter
161. sks 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 is easier to use As you enter a word into the text field Help searches for and highlights the topic if one can be found If not try the Find tab Enter a word or phase and help will display all topics that contain the 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 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 9 and then click the item of interest RFA300A Measurement Set 8VSB Service Manual 2 17 Operating Basics Windows NT Online Help Release Notes Backing Up Files 2 18 Information about Windows features is available through the Windows help system Access Windows help as
162. solution of 1 second or less Retention Time Real time clock CMOS setup and PnP NVRAM Projected battery life 1510 years BIOS DTI BIOS field upgradable Bus 32 bit PCI Expansion Slots 8 PCI slots Graphics 640 x 480 VGA resolution with up to 16 million colors Non volatile Storage Floppy Disk drive 3 5 inch PC compatible floppy disk drive 1 44 Mbyte high density double sided 2HD CD ROM drive PC compatible half height IDE CDROM drive 8X Hard Disk Drives 6 GB EIDE HDD Mainframe Interfaces One loop through ethernet port One bi directional RS 232 RS 422 RS 485 port One alarm relay out One parallel port printer Two hot pluggable keyboard ports one on the rear panel one on the left front side panel Two hot pluggable mouse ports one on the rear panel one on the left front side panel RFA300A Measurement Set 8VSB Service Manual 1 9 Specifications Table 1 4 Front panel interface characteristics Characteristic Description Mouse Port PS2 compatible mouse port using a mini DIN connector Pin assignments 1 data 4 45V 2 NC 5 clock 3 ground 6 NC Keyboard Port PS2 compatible keyboard port using a mini DIN connector Pin assignments 1 data 4 51 2 NC 5 clock 3 ground 6 NC USB Port Series A USB receptacle Pin assignments 1 Vbus 3 data 2 data 4 GND Touch Panel Standard 10 4 in touch panel pointing device mounted on the surface ofthe TFT display connecting t
163. t Comm Port 1 icon to start the HyperTerminal application If a location information dialog box opens enter your area code and then close the dialog box If you are prompted to install a modem click NO Type some letters and numbers in the HyperTerminal window All the letters and numbers should be looped back and displayed on the screen Select the Transfer Send Text File menu and verify that the complete text of the file is looped back and displayed on the screen The file does not need to be big Exit Hyper Terminal Confirm disconnect now RFA300A Measurement Set 8VSB Service Manual Performance Verification Uninstall PV Software and Restore Data Files After the testing and adjustments are finished restore the user setup and user data files using the following steps 1 2 3 Exit the RFA300A application if it is running In the RFA300A PV folder double click on the Uninstall PV icon In the Confirm File Deletion dialog box click OK when prompted Do you want to completely remove the selected application and all its components If the uninstall program prompts you to restart the computer select Yes and then click on Finish After the computer reboots the PV test software is uninstalled and the user files setups masks colors and so forth that were saved at the beginning of this procedure are now all restored Verify that the RFA300A PV folder has been removed from the desktop Start the RFA300A
164. the CD platter Clean the face of the CD drive monthly with a dampened cloth internal components may be damaged T CAUTION Do not allow moisture to enter the drive When power is applied the Keyboard The optional keyboard may require occasional cleaning to remove lint or oil buildup Use the following procedure to clean the keyboard 1 Ifthe product is operating stop any running applications and shut down the operating system 2 Unplug the keyboard from the mainframe 3 Clean all lint and loose debris from the keyboard with either clean dry low velocity air or with a clean soft brush 4 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 RFA300A Measurement Set 8VSB Service Manual 6 3 Maintenance 6 4 AN A Interior CAUTION If liquids such as coffee or soft drinks are spilled on the keyboard intermittent operation can occur In this case consider replacing the keyboard 5 Reconnect the keyboard to either keyboard connector on the left side of the mainframe or to the rear panel I O board as needed for your application Occasional cleaning of a mouse interior 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 Unplug the mouse from the mainframe
165. 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 RFA300A 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 RFA300A 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 through an external 10 dB attenuator 119 6328 00 to the RF input connector of the RFA300A measurement set Use the RFA300A measurement set delta markers to compare the peak signal power to the noise floor as shown in Figure 4 7 a Set the cursor at the peak of the RF signal Use the zoom feature to expand the waveform to better position the cursor on the peak b Set the X 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
166. the plug in circuit boards during cleaning RFA300A Measurement Set 8VSB Service Manual Maintenance In Case of Problems Diagnostics Software Problems Hardware Problems This section addresses problems that you may encounter while using the 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 Use the diagnostics to isolate problems to software or hardware within the instrument For additional help on the diagnostics contact your local Tektronix representative The following diagnostic tools are available with your measurement set W Power on diagnostics Run when you first power on the instrument or when you first start the measurement set application If a diagnostic failure occurs during power on the Power On Diagnostics dialog box appears m Extended diagnostics Test the instrument more thoroughly than the power on diagnostics You can use the extended diagnostics to isolate problems to an individual module The extended diagnostics are part of the measurement set application To run extended diagnostics go to the Tools menu select Diagnostics and click the Extended Diagnostics tab Your measurement set comes with software already installed For any suspected software problems try to determine whether the problem is with the measure
167. tion procedures starting on page 5 5 13 Exit the hwui exe program RFA300A Measurement Set 8VSB Service Manual 4 15 Performance Verification LO Frequency B EI EU pie I PT Pha Leck Ss ETA Lock Indicators Update button Tune Src FracN ADC readout FracN Update button P Coarse Tune LOLow Filter setting Figure 4 4 Hwui screen with Synthesizer selected 4 16 RFA300A Measurement Set 8VSB Service Manual Performance Verification Fractional N Synthesizer Check For the Fractional N synthesizer the 10 MHz VCXO frequency and the 86 1 MHz VCXO are checked to determine if they need adjustment Preparation for Testing 1 Connect the RF Input 1 connector of the RFA300A measurement set to the spectrum analyzer 2 Set 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 Exit the RFA300A measurement application if it is running Run the program hwui exe In the Hwui window click the Down Converter soft key PF the Down Converter window set the Input Atten to 0 dB 10 MHz VCXO 1 Select the Synthesizer menu shown in Figure 4 4 on page 4 16 Frequency Check Set LO Frequency MHz to 400 000 Press the LO Freq MHz button Push Tune Src for Internal Verify that Ref Src is Internal Pr
168. tions Performance Conditions The Performance requirements are valid within the environmental limits if the instrument was adjusted at 25 C 5 and you allowed a minimum warm up time of 20 minutes To make valid measurements you must apply a single channel high amplitude 8VSB signal directly to the input of the measurement set RFA300A Measurement Set Specifications Table 1 1 Input specifications Characteristic RF Input Input Frequency Range Demodulation Modes Outof channel Emission Modes Input impedance Return Loss Selected P ort Nonselected Port nominally terminated RF Inputs Isolation Signal Amplitude Without external 10 dB attenuator With external 10 dB attenuator IF Filter Description Channel 7 through Channel 69 174 MHz to 806 MHz 162 MHz to 818 MHz 50 Q gt 25 dB 174 MHz to 806 MHz gt 15 dB 174 MHz to 806 MHz 80 dB 174 MHz to 806 MHz 1 mW to 1 W 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 circuitry has enough range to handle up to 1 W at the input connector 10 mW to 2 W 10 dBm to 433 dBm For all measurements requiring demodulation the 8VSB signal is passed through 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 ofthe trans
169. tive Components 6 1 Preventive Maintenance 2 6 2 In Case of Problems i i es Seek RR Geeta dak ES 6 5 Checking the Power Supply Module 6 7 Removal and Replacement Instructions 6 8 Application Modules sissoo 5505 05 oo ku 01 cade case bes 6 12 Mainframe Modules csv e eR LE RR eR RR ERR RUE E cated 6 20 System Recovery 95225 elem 6 49 OVeEVIeW DNE IURE 6 49 Restore the BIOS Settings 6 51 Restore the Contents of the Partitions 6 52 Install and Configure Individual Components 6 54 Repacking for 6 60 Obtaining Replacement Packaging 6 60 RFA300A Measurement Set 8VSB Service Manual Table of Contents Options Op ons as ee ESO anin Beer OSS SE Replaceable Electrical Parts Replaceable Electrical Parts Diagrams Diagrams Replaceable Mechanical Parts Replaceable Parts Parts Ordering Information Using the Replaceable Parts List RFA300A Measurement Set 8VSB Service Manual Table of Contents List of
170. to cable label 0 to J 8 of to J 2 of the Down J 0620 of the Synthesizer module the Acquisition module Converter module 0270 Q1 J0271 0340 400 Alarm J 0480 0460 10440 connector 10580 1 169 0580 258 3 MHz cable label 4 0460 10 MHz Tune Voltage cable to J 4 Secondary Input of Down label 6 to J 0420 of cable connector Converter module of the cable Synthesizer module Figure 6 5 Pilot lock module connector locations RFA300A Measurement Set 8VSB Service Manual 6 15 Maintenance Removing the Synthesizer Module m Remove the holding screws from the top and bottom of the synthesizer module rear panel The synthesizer module is a two circuit board assembly do not attempt to dismantle the assembly Disconnect the following cable connectors between pilot lock module and the synthesizer module see Figure 6 6 for cable locations a Cable connector coupling between J0420 of the synthesizer module and J0460 of the pilot lock module cable label 6 b Cable connector coupling between J0260 of the synthesizer module and J0270 of the pilot lock module cable label 7 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 J200 Carefully pull up on the module to loosen it from the backplane connectors and gain access to the remaining interconnection cables 0570 LO Low Oscillator 0380 of the Synthe
171. to 500 Hz 10 minutes each axis 3 axes 30 minutes total 2 28 grus total from 5 to 500 Hz 10 minutes each axis 3 axes 30 minutes total Half sine 20 g s 11ms duration 3 drops each side 18 shocks total no media in floppy disk drive Non Operating Half sine 30 g s 11ms duration 3 drops each side 18 shocks total no media in floppy disk drive Table 1 9 Transportation Characteristic Transportation Package Material 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 RFA300A Measurement Set 8VSB Service Manual 1 15 Specifications Certifications and Compliances Table 1 10 Certifications and compliances Category EC Declaration of Conformity EMC FCC Compliance EC Declaration of Conformity Low Voltage U S Nationally Recognized Testing Laboratory Listing Canadian Certification Additional Compliance Standards or description Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was demonstrated using EN 61326 1997 Product Family Standard for Electrical Equipment for Measurement Control and Laboratory Use EMC Requirements Emissions EN 61326 IEC 61000 3 2 Immunity IEC 61000 4 2 IEC 61000 4 3 IEC 61000 4 4 IEC 61000 4 5 IEC 61000 4 6 IEC 61000 4 8 IEC 6
172. 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 WARNING Warning statements identify conditions or practices that could result in injury or loss of life N CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property RFA300A 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 accessible 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 A CAUTION WARNING Protective Ground Refer to Manual High Voltage Earth Terminal RFA300A Measurement Set 8VSB Service Manual 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
173. unted on the power supply module Remove the screws from the four rear panel feet see Figure 6 2 RFA300A Measurement Set 8VSB Service Manual 6 9 Maintenance Handle mounting screws Figure 6 1 Right side handle screws Rear feet screws Figure 6 2 Rear panel feet removal 6 10 RFA300A Measurement Set 8VSB Service Manual Maintenance 7 Use either an adjustable wrench or appropriate size open end wrench as a 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 CAUTION Use care when touching the EMI
174. ut 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 RFA300A measurement set to the 8VSB transmitter RF sample output connector using a 50 Q 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 RFA300A measurement set must be in the range of 10 mW to 1 W 10 dBm to 30 dBm for correct operation 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 green If it is below the green level the signal power to the measurement set must be increased 6 Close the dialog box and click OK to close the Instrument Setup dialog box RFA300A Measurement Set SVSB 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 measureme
175. ve humidity to 50 50 Altitude To 10 000 ft 3 040m derated 1 C per 1 000 ft above 5 000 ft altitude The quality of the input signal path is critical in obtaining the full specified performance of the RFA300A measurement set Therefore you must connect the RFA300A 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 peak to peak 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 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 and 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 ft or more place extreme requirements on cable qua
176. 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 Ctrl 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 dialog box Ctrl 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 touch screen Ctrl V PASTE Ctrl X CUT Ctrl 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 RFA300A Measurement Set 8VSB Service Manual 2 9 Operating Basics 2 10 Soft Keyboard You can use the soft keyboard with any application To display the soft key board select My T Soft from the Program menu click the keyboard icon in the System Setup menu or click a keyboard icon displayed in an application You can configure the keyboard change the size for example To do this click the icon shaped like a hand in the upper right corner of the keyboard display to access a dialog box Tutorial For a tutorial
177. y set to provide the correct oscillator tune range and low phase noise LO LOW Resonator Check 1 Exitthe RFA300A measurement application if running Procedure In the PV folder double click on Hwui icon to run the hwui exe program This program displays a control screen the Hardware User Interface HwUi for performing the checks and adjustments Select Synthesizer see Figure 4 4 Select LOLow Filter 1 Set LO Freq MHz 200 000 Set Tune Src Internal Set Coarse Tune 50 se v6 oo mw OW Press the Update button in the FracN Board box NOTE THE ABOVE 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 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 perform the LOLow Resonator Adjustment and the LOLow Calibra
178. you would with any Windows application 1 Go to the Windows taskbar and click Start 2 Select Help from the popup menu NOTE To access Windows NT help using the Touchscreen press the START key on the font panel The online Release Notes contain information about this release of the RFA300A application Check the Release Notes for information such as software compati bility and software version differences from last release To access the Release Notes go to the Windows NT 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 Accessories System Tools Back Start the tool and determine which files and folders 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 RFA300A Measurement Set 8VSB Service Manual Theory of Operation The RFA300A Measurement Set 8VSB measures the quality of digital television 8VSB signals The measurement set system consists of four modules installed in a standard mainframe platform The mainframe processor makes the calculations and data transfers required to measure the signal The mainframe circuitry also provides the p

RFA300A Measurement Set 8VSB Service Manual

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