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Tektronix 11A71 User's Manual
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1. J15 Attenuator Al Connector Main Assembly Board A3U820 A3U700 A3 AZ Housekeeper NV Kernel Front Panel IC RAM Board Board A3U800 A3U500 A3J400 A3J410 EPROM Processor UID Jumper IC Ic Jumper Figure 3 1 Field Replaceable Units FRU Locator and AT Main Board Securing Hardware 11A71 Service Reference 3 5 Corrective Maintenance Removing Replacing FRU ICs Observe all the special precautions mentioned under the heading Static Sensitive Device Classification in this section Housekeeper Integrated Circuit Slam Pack ICs The Housekeeper IC A1U600 is indexed to its socket by a beveled comer as shown in Figure 3 2 The other corners are notched to fit the edges of the socket The beveled corner aligns with a spring smali metal tab at one corner of the socket Remove the Housekeeper IC as follows Ej Step 1 Unfasten the retaining clip by moving it across the tabs It may help to push down slightly on the cover C Step2 Remove the cover slowly to prevent the IC from falling out Observe the index of the IC before removing it C Step 3 Remove the IC with tweezers Avoid touching the IC or the socket contacts with your fingers Finger oils can lessen reliability install the Housekeeper IC as follows C Step 1 Using tweezers place the beveled comer of the replacement IC against the index spring Do not damage the spring with the beveled corner Shorting of the tw
2. 1 2 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier oniy Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 nennen 500 1 V div 4 gt 0 617 500 500 mV div 6 20 925 a a a I 500 50 mV div 6 20 925 500 20 mV div 6 20 925 pment tee le E e e tae peed 500 10 mV div 6 20 925 amma art tear 2 24 Checks and Adjustments Part 6 Bandwidth Setup to Check Amplifier Bandwidth Functional Test Procedure Mainframe Leveled Sine Wave Generator 42 inch Coaxial Cable Setup to Check Amplifier Bandwidth Functional Test Procedure Procedure to Check Amplifier Bandwidth Functional Test Procedure Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Amplifier CHT Display On Off an er de eamew a dae bos Sea on Leveled sine wave generator PROQUEIIOY an ame Eby en Ref 6 MHz Mainframe Vert Size or VERTICAL SIZE 00 eee 200 mV div Main Size or HORIZONTAL SIZE 100 ns div C Step 2 Select the Peak Peak measurement if available or the Cusors to measure the peak to peak amplitude of the waveform Step 3 Set the leveled sine wave generator for 1 2 V peak to peak OO Step 4 Set the leveled sine wave generator Frequency contro to the maximum bandwidth frequency specified for the mainframe
3. C Step 6 Set the Ch 2 display on off to on 2 26 Checks and Adjustments Part 8 This part shows the setup and lists the procedure to check input resistance Input Resistance Specification Impedance resistance is 50 0 within 1 Q Setup to Check Input Resistance Maintrame BNCT Adapter Input Sense Digital Multimeter 42 inch Coaxial Cables Setup to Check input Resistance Procedure to Check Input Resistance C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Mainframe sarah kr no setting changes Amplifier CH 1 Display on off ce nn a an ee on Digital multimeter DMM Resistance mode enmereneeneenenerenneene nee 4 Wire Step 2 Check that input resistance is 50 Q within 1 Q 11A71 Service Reference 2 27 Part 9 This part shows the setup and lists the procedure to check vertical accuracy Vertical Accuracy Specifications The specifications for this part are as follows sw DC balance so that trace is within 40 2 divisions of center from 10 mV through 1 V Peak Peak measurement of 5 V 95 mV for the 11300 Series and 5 V 65 mV for the 11400 Series Setup to Check Vertical Accuracy Mainframe Calibration Generator 11A71 CH1 42 inch Coaxial Cable Setup to Check Vertical Accuracy Procedure to Check Vertical Accuracy C Step 1 First Initialize
4. Release Latch Install the amplifier in any 11000 Series Oscilloscope mainframe as follows 1 Set the mainframe ON STANDBY switch to STANDBY to prevent damage to the mainframe If the green indicator light remains ON when the STANDBY position is selected then the switch has been left internally disabled after the servicing of the power supply To enable the ON STANDBY switch refer to the Maintenance section of the mainframe Service Manual 2 Align the grooves in the top and bottom of the amplifier with the guides in the mainframe plug in compartment 3 Insert the amplifier into the mainframe until its front panel is flush with the front panel of the mainfrarne Remove the amplifier from an 11000 Series Oscilloscope mainframe as follows 1 Set the mainframe ON STANDBY switch to STANDBY to prevent darnage to the mainframe 2 Pull the release latch see Fig 1 1 to disengage the amplifier from the mainframe 3 Pull the amplifier straight out of the plug in compartment 11A71 Plug in Bottom Guide Figure 1 1 installing the 11A71 Amplifier in a Mainframe 1 4 General information Instrument Options Packaging for Shipment Operating Environment 11A71 Service Reference The customer car order Option 26 which includes one P6231 probe If possible save and reuse the original carton and packaging to package the instrument when shipping it by commercial transportation Package and
5. Instrument type or model number Instrument serial number Instrument modification number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any change in the part number Change information if any is located at the rear of this manual Module Replacement The 11A71 Amplifier is serviced by module replacement so there are three options you should consider Module Exchange In some cases you may exchange your module for a remanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800 TEKWIDE ext BV 5799 Module Repair You may ship your module to us for repair after which we will return it to you New Modules You may purchase new replacement modules in the same way as other replacement parts 11A71 Service Reference 5 1 Using the Replaceable Parts List The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you find the all the Information you need for ordering replacement parts Item Names In the Replaceable Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further
6. Calibration constant checksums Calibration constant values A D and D A converters Probe power fuses Input protection Diagnostic Troubleshooting 3 22 Signal path Using the Seif Tests Extended Diagnostics After ail Extended Diagnostic Self Tests have run any resultant error index codes appear on the display next to the associated circuit block names in the Extended Diagnostics menu Each circuit block that had a failure gives the first error encountered and the number of failures in the Block Select the label of a failed Block then select the Area label to get a more complete list of the error index codes in a Block Selecting the Routine label shows the lowest level test routines in the selected Area The currently selected Block Area and Routine are shown Several operating mode selectors are available on the screen When certain test routines are selected some of these operating modes are unselectable Refer to the mainframe User s Reference manual for information on Extended Diagnostics or Extended Test menus and operation New Configuration Calibration When an arnplifier is first installed in a mainframe or when one is moved to a different compartment in the mainframe the instrument is in a new configuration mode After the instrument runs the Power Up Diagnostics it recalibrates itself for the new configuration During this calibration the message Powerup new configuration partial calibrati
7. Part No 070 6787 01 TEK Service Reference Product Group 47 THE TIAZ AMPLIFIER WARNING The following servicing instructions are for use by qualified personne only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to performing any service Please check for CHANGE INFORMATION at the rear of this manual Tektronix COMMITTED TO EXCELLENCE LEIA BI raj ER instrument Serial Numbers Each instrument manufactured by Tektronix has a serial number on a panel insert or tag stamped on the chassis The first letter in the serial number designates the country of manufacture The last five digits of the serial number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows B010000 Tektronix Inc Beaverton Oregon USA G100000 Tektronix Guernsey Ltd Channel Islands E200000 Tektronix United Kingdom Lid London 300000 Sony Tektronix Japan H700000 Tektronix Holland NV Heerenveen The Netherlands Instruments manufactured for Tektronix by external vendors nz outside the United States are assigned a two digit alpha code to rw identify the country of manufacture e g JP for Japan HK for hos Hong Kong etc Tektronix Inc RO Box 500 Beaverton OR 97077 Copyright Tektronix Inc 1987 1989 All rights re
8. C Step 6 Adjust TRIGGER BAL adjustment R813 on the A1 Main board to 0 20 mV See Figure 2 1 for adjustment locations C Step 7 Set the ON STANDBY switch to STANDBY Remove the flexible extender from the mainframe and the amplifier R812 R813 Common Trigger Mode Balance Figure 2 1 A1 Main Board Trigger Balance Test Point and Adjustment Locations T1A71 Service Reference 2 13 Part 4 The fast protection circuit is adjusted for proper input impedance and minimum input Current and input current Impedance Measurement Limits The measurement limits for this part are as follows Input resistance 50 1 Q Open circuit input voltage 0 2 0 mV Setup to Examine Adjust Input Current and Impedance Mainframe Digital Multimeter 18 inch Coaxial Cabie BNC to Banana Adapter Setup to Examine Adjust Input Current and impedance Procedure to Examine Adjust Input Current and impedance C Step 1 Remove the top cover of the mainframe Then perform the following settings in the order listed Mainframe ON STANDBY un vx ea va ees Fue a a Deke Oe oe ON Wait for calibration cycle to complete UTILITY major Menu ee een Initialize Signal standardizer Not used in this procedure Center plug in CH 1 Display on off 1 a ee esse ein on Mainframe Vert Size or VERTICAL SIZE 2222 cece cee ene 10 mV div Digital Multimeter DMM MOR ere ne tuie mr sedate side aie Eee ates DC Bande are
9. C Step 2 Unscrew and remove the four Torx head screw washer assemblies Maintenance Corrective Maintenance C Step 3 Lift the plastic frame from the A1 Main board C Step 4 Notice the index location of the hybrid and remove the hybrid from A1 Main board with the tweezers Note Step 5 describes the removal of the elastomer from the plastic frame This step is unnecessary when replacing the hybrid only Cl Step 5 Notice the index location of the elastomer contact holder Grasp and lift the corner of the contact hoider with the tweezers to remove the holder from the plastic frame Do not touch the gold plated contacts with your fingers Replace the Hypcon Assembly as follows C Step 1 Grasp a comer of the elastomer with the tweezers and place the elastomer into the plastic frame C Step 2 Align the keyed comer of the elastomer with the keyed corner of plastic frame C Step 3 Tamp the elastomer into the plastic frame uniformly Note Keeping the elastomer clean is very important Small hairs and elastomer flash under the contacts which are almost invisible to the naked eye can prevent good electrical contact Most apparent failures of the hybrid are actually due to contamination of the Hypcon Therefore do not touch the gold plated contacts with your fingers C Step 4 Place the hybrid into the square hole in the A1 Main board The hybrid is keyed so that it will fit into the A1 Main board in on
10. C After storing the amplifier at temperatures outside the operating limits allow the amplifier to reach the safe operating temperature before installing it in the mainframe and applying power to the mainframe Enhanced system accuracy Is available after a 20 minute warmup period If the mainframe is in the Enhanced Accuracy state and the internal temperature of the mainframe changes 5 C the mainframe reverts to normal accuracy 1 5 Checks and Adjustments This section contains procedures to examine measurement limits check electrical specifications and to manually set all internal adjustments This procedure provides a logical sequence of check and adjustment steps and is intended to return the amplifier to specified operation following repair or as a part of a routine maintenance program To functionally test the oscilloscope perform the parts which have a yes indication in the Functional Test column of Table 2 1 Measurement Limits Specifications Adjustments and Functional Test Refer to the 17A77 User s Reference Supplement for more information about advertised specifications and amplifier operation At the beginning of each part the specifications or measurement limits are given Then the setup for each procedure in that part provides information concerning test equipment setup or interconnection Refer to Table 2 2 Test Equipment for more information concerning test equipment used in these setups Tab
11. Safety Summary This general safety information is directed to operators and service personnel Specific warnings and cautions will be found throughout the manual where they apply but may not appear in this summary Terms in Manuals CAUTION statements in manuals identify conditions or practices that could result in damage to the equipment or other property WARNING statements in manuals identify conditions or practices that could result in personal injury or loss of life Terms on Equipment CAUTION on equipment means a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER on equipment means a personal injury hazard immediately accessible as one reads the marking Symbols in Manuais Static Sensitive Devices Symbois on Equipment 4 A DANGER Protective ATTENTION High Voltage ground earth Refer to terminal manual Power Source This amplifier is intended to operate in a mainframe connected to a power source that will not apply more than 250 V rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the mainframe power cord is essential for safe system operation Grounding the Product This amplifier is grounded through the grounding conductor of the mainframe power cord To avoid electric shock plug the mainframe power cord into a
12. When a connection is made to a circuit board the indexing of the triangle on the multi pin holder is determined by the square pad The multi pin connector is keyed by a gap between pins 1 and 3 in the holder A small plastic plug covers the pin 2 position on the end of the holder There is a corresponding gap between pins 1 and 3 on the circuit board as shown in Figure 3 8 The female connector is illustrated by this view The male connector also has a similar pin arrangement but it is not shown Align the holder plug with the gap between the circuit board pins The connector is then ready to be installed The gray connector has a contrasting color line along along one side of its ribbon cable This colored line represents the location of pin 1 or the triangle index mark on the connector To remove this connector grasp the ends of the connector and pull it straight out from the circuit board To install this connector align the connector s color line with the square shaped circuit board pad which is pin 1 Push the connector on the pins Multi Pin Connector Index Figure 3 8 Indexing of Multi pin Connectors 3 18 Maintenance Diagnostic This section provides the information necessary to troubleshoot a faulty Troubleshooting instrument to the Field Replaceable Unit FRU level FRUs are circuit boards attenuator modules and integrated circuits or hybrids that are replaceable without soldering The primary mean
13. 2 28 Procedure to Check Vertical Accuracy cu 2 e eee 2 28 Check DC Balance by performing Step 2 2 2 eee 2 28 Check Gain by performing Steps 3 through 7 22 222222 2 29 Pat IC AC Couple cep yG bus ceed er een wanes ees 2 30 Specifications un a ee swe Mabon arena 2 30 Setup to Check AC Coupling 0 0 0 ec eee een en 2 30 Procedure to Check AC Coupling 0 0 00 c cece eee eeee 2 30 Parl DG Balance u zu 0 0 0 sd Ras ane di hed fen DAG DOR Ee ny RENE 2 32 Specincaton u ea er ne erh 2 32 Setup to Check DC Balance 2 0 eee eee ee 2 32 Procedure to Check DC Balance 0 0 0 eee ene 2 32 Part 12a AV DC Accuracy 11400 Series Mainframe Procedure 2 33 SOCCIRCAION ae oe Sania deem heen ER Read an 2 33 Setup to Characterize the 11400 Series Mainframe 2 33 Procedure to Characterize the 11400 Series Mainframe 2 33 Setup to Check the Amplifier DV DC Accuracy 22 nn scene 2 34 Procedure to Check the Amplifier DV DC Accuracy 2 34 Part 12b AV DC Accuracy 11300 Series Mainframe Procedure 2 37 Specification ae arrowed ee eng ays ehren Reste 2 37 Setup to Characterize the 11300 Series Mainframe 2 37 Procedure to Characterize the 11300 Series Mainframe 2 37 Setup to Check the Amplifier DV DC Accuracy 004 2 38 Procedure to Check the Amplifier DV DC Accuracy 2 39 Contents Checks and A
14. 25 Self Tests Extended Diagnostics Error Index Codes 3 25 Contents General Information This manual is designed for use by qualified service personnel It contains information necessary to check maintain and troubleshoot the 11471 Amplifier Troubleshooting is primarily based upon internal diagnostics These diagnostics isolate problems to the field replaceable unit FRU level Once the faulty FRU is identified use the procedures in this manual to remove and replace the faulty FRU Section 5 Replaceable Parts gives a complete list of the FRUs in this amplifier The 11471 is a single channel wide bandwidth amplifier that plugs into any of the 11000 Series Oscilloscope mainframes that use amplifiers Commands from the mainframe control all the functions of the amplifier The front panel of the amplifier has a button and a LED indicater for each input channel Other controls and status indicators are located on the mainframe The impedance of the input is 50 The amplifier provides display and trigger signals to the mainframe The amplifier has a TEKPROBE input connector The TEKPROBE input connector is compatible with a Level 1 or Level 2 TEKPROBE a probe with a BNC connector or a BNC connector When a probe is connected to the input connector the amplifier will detect the probe encoding information and use this information to automatically achieve the appropriate settings 11A71 Service Reference
15. 4 gt 0 575 1000 500 mV div 6 i i gt 0 863 1000 50 mV div 6 gt 0 863 4000 20 mV div 6 gt 0 863 4000 10 mV div 6 gt 0 863 j 500 10 mV div 6 20 925 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes ES n 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier oniy Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 500 1 Vidiv 4 gt 0 617 500 500 mV div 6 gt 0 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 gt 0 925 500 10 mV div 6 20 925 2 24 Checks and Adjustments nk i wom Part 6 Bandwidth _ Steps Check that the amplifier amplitude computed by dividing column 8 by column 2 is at least the value shown in column 6 Cc Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11471 Amplifier Bandwidth in the 11402 or 11403 Mainframe 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifler only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 ec AACS Rea nn nennen 1000 ae yah 1 Vdiv 4 3 gt 0 575 1000 at 500 mvidiv 6 gt 20 863 1000 50 mV div 6 eee 20 863 1000 mye 20 mV div 6 gt 0 863 i ae entre i a an 1000 10 mV div 6 l j 20863
16. 5 Set Main Size to 100 us div 0O Step 6 Examine the waveform for minimum long term spiking and rolloff flat top DO NOT attempt to adjust the compensation if the waveform already appears to be appropriate Proceed to Step 8 _ Step 7 Adjust compensation adjustment R311 and R312 on the A1 Main board for optimum square wave flat top See Figure 2 3 for adjustment locations Step 8 Set the calibration generator period to 0 1 ms Step 9 Set the Main Size to 10 ys div Step 10 Examine the waveform for minimum long term spiking and rolloff flat top DO NOT attempt to adjust the compensation if the waveform already appears to be appropriate Proceed to Part 6 Bandwidth C Step 11 Adjust compensation adjustment R310 R510 and C412 on the A1 Main board for optimum square wave flat top See Figure 2 3 for adjustment locations C Step 12 Reinstall the top cover of the mainframe C Step 13 Move the amplifier from the Center to the Left plug in compartment 2 20 Checks and Adjustments Part 6 Bandwidth First amplitude is measured at the specification frequencies using the signal standardizer to characterize the mainframe Then the displayed amplitude is checked at the specification frequencies to determine the amplifier s contribution to the bandwidth Specified performance of the amplifier in all mainframes is ensured only if the amplifier is tested in an 11402 or 11403 mainfr
17. Diagnostics menus are in a three level hierarchy with the Block menu at the highest level Each amplifier is one Block A Block is broken into a number of parts or circuit areas in the Area menu the second level Touching the Area label at the bottom of the menu displays the Area menu for the selected Block Each circuit Area has a Routine menu the third level associated with it that has one or more selectable Routines Routines are the smallest test units that are selectable and runable This Biock Area and Routine menu hierarchy generates the error index codes Extended Diagnostics error index codes are five digit codes whose first character indicates the subsystem or amplifier tested The last four digits are hexadecimal hex numbers that indicate the Block Area Routine and specific failure mode For example R1241 is decoded as follows Right plug in Block name plug in Area name Group Routine name Checksum Probe Failure Identity specific failure mode ANID The subsystem character of an error index code is one of the following and indicates the compartment in which the amplifier is installed In the tables in this section only the four digit failure code is listed the prefix L C or R is omitted L Left Cc Center R Right Front panel controls are active during the Self Test sequence and any disturbance causes a test failure Self Test Diagnostics test the following m Attenuator relay driver Probe coding
18. Item Name identification U S Federal Cataloging Handbook H6 1 can be used where possible Indentation System This parts list is indented to show the relationship between items The following example is of the indentation system used in the Description column 1 2 3 4 6 Name amp Description Assembly and or Component Attaching parts for Assembly and or Component END ATTACHING PARTS Detail Part of Assembly and or Component Attaching parts for Detail Part END ATTACHING PARTS Parts of Detail Part Attaching parts for Parts of Detail Part END ATTACHING PARTS Attaching parts always appear at the same indentation as the item it mounts while the detail parts are indented to the right indented items are part of and included with the next higher indentation Attaching parts must be purchased separately unless otherwise specified Abbreviations Abbreviations conform to American National Standards Institute ANSI standard Yui 5 2 Replaceable Parts CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mr Code Manufacturer Address City State Zip Code 06383 PANDUIT CORP 17301 RIDGELAND TINLEY PARK IL 07094 2917 22599 AMERACE CORP 15201 BURBANK BLVD VAN NUYS CA 91411 3532 ESNA DIV SUITE C 34649 INTEL CORP 3065 BOWERS AVE SANTA CLARA CA 95051 SALES OFFICE ST4 2 75915 LITTELFUSE INC 800 E NORTHWEST HWY DES PLAINES IL 60016 3049 SUB TRACOR INC 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97077 0001 P
19. Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 1 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Caiculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 1 V div 4 20 575 1000 500 mV div 6 20 863 a 1000 50 mV div 6 gt 0 863 1000 gt 20 mV div 6 gt 0 863 1000 10 mV div 6 gt 20 863 0 10 mV div 6 20 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes 1 2 3 4 6 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 cot 2 500 1 V div 4 20 617 500 500 mV div 6 gt 0 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 gt 0 925 500 10 mV div 6 20 925 2 24 Checks and Adjustments Part 6 Bandwidth Step8 Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 O Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 1 2 3 4 5 6 Mainframe with Amplif
20. does not test for mainframe calibration voltage reference accuracy or long term stability Therefore the mainframe is characterized and tests must be performed immediately after an Enhanced Accuracy Calibration Also the amplifier specifications are more stringent than those in the 11A77 User s Reference Supplement Specifications Refer to Table 2 5 Setup to Characterize the 11400 Series Mainframe Calibrator Output Mainframe e BNC io Banana Adapter Digital Multimeter Coaxial Cable Setup to Characterize the 11400 Series Mainframe Procedure to Characterize the 11400 Series Mainframe T Step 1 Perform the following settings C m r DUGA a nannten een no setting changes Mainframe UTILITY major menu 6 eee eee Extended Diagnostic BOCK ur freaks ooaee ee ea adden Gemypenradnd Points Acq PICA eu yearn sen ER Cal Refs Routine are ar FP 10 000 V RUN ae ee ee een send Digital multimeter DMM MOdB 1 2 nenne ee DC Ranges serie eee Ded Sie iu Gs debe des Auto _ Step 2 Record the DMM absolute value 11471 Service Reference 2 47 Part 13 DC Offset Accuracy Step 3 Press Exit Step 4 Press FP 9 9951 V Step 5 Press Run Step 6 Record the DMM reading Step 7 Press Exit Step 8 Press Exit Diagnostics MFOOOOOOD Step 9 Add the absolute values of the DMM readings obtained in Steps 2 and 6 Divide the result by 19 9951 V to obtain the mainframe s
21. eee eee eee 3 22 Amplifier Memory Backup Power 00 cee cece eee eee 3 23 Field Replaceable Unit FRU Guide 22222220 eee 3 23 Fuse Troubleshooting 00 cece eee seen en 3 26 JUPES ya ca ee dee ee RT Fed 3 26 Theory of Operation Block Diagram Description 0 20 00 e eens 4 1 Signal FOW a en Reda whe Pe ewn shard eed cain 4 1 POWER na a Ne serie 4 3 Replaceable Parts Parts Ordering Information 00 c cece cee eee nent eet eee 5 1 Module Replacement 0 cece cee e nent ener aee 5 1 Using the Replaceable Parts List 2 2 0 0 cece cece ee een eee 5 2 HOM Namoi icici een Sera Gas sneha a Dice ae 5 2 Indentation System 2 6 cece eee eee cette een eee eee une 5 2 Abbreviations a een 5 2 Change Information 11A71 Service Reference nz it List of Illustrations List of Tables Figure 1 1 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 9 Figure 4 1 Table 2 1 Table 2 2 Table 2 3 Table 2 4 Table 2 5 Table 3 1 Table 3 2 Table 3 3 Table 3 4 Table 3 5 Table 3 6 Installing the 11A71 Amplifier in a Mainframe 1 4 A1 Main Board Trigger Balance Test Point and Adjustment Locations 0 cick ce takes ae ng arene wire dines 2 13 A1 Main Board Input Current and Impedance Adjustment Locations 0 000000 ccc ern 2 15 Ai Main Board Low Frequency
22. mV div 4V 21 0 mV 200 mV div 2V 10 0 mV 100 mV div 1V 5 0 mV 50 mV div 500 mV 2 5 mV 20 mV div 200 mV 1 0 mV 10 mV div 100 mV 0 50 mV 10 mV div 50 mV 0 30 mV 11A71 Service Reference 2 45 Maintenance Preventive Maintenance This section contains information for performing preventive maintenance corrective maintenance and diagnostic troubleshooting on the 11A71 Amplifier For more information on any equipment listed in this section refer to Table 2 2 Preventive maintenance performed regularly can prevent or forestall amplifier breakdown and may improve amplifier reliability The severity of the environment to which the amplifier is subjected determines the frequency of maintenance Amplifier Shield Removal The side shields top and bottom frames and front panel reduce radiation of electrornagnetic interference EMI from the amplifier The side shields are held in place by grooves in the frame To remove a shield pry it out with your fingers beginning at the rear of the appropriate side To install a shield position it over the frame grooves then press down with your fingers until the shield snaps into place Pressure must be applied along the full length of the frames to secure the shield The amplifier will not slide into the mainframe if the side shields are not fully seated in the frames Cleaning The amplifier shouid be cleaned as often as operating conditions require Accumulation of dirt on components ac
23. panel pushbuttons The MPU tells the mainframe when a front panel button is pushed The mainframe then tells the amplifier what action to take for example display the channel and turn on the channel s respective front panel LED Control Flow Under the control of the mainframe s channel switch sequencing signals the Housekeeper sequentially turns the outputs on or off If the amplitude of the input signal is excessive the Kemel board switches the coupling mode to Off On Off signals from the Kernel board independently control both the Vertical and Trigger Amplifiers The Kernel board also provides dc balance dc offset and gain adjust signals to the input Amplifier and controis the Attenuator Power The mainframe supplies all the power to the amplifier 11A71 Service Reference Theory of Operation Replaceable Parts This section contains a list of the components that are replaceable for the 11A71 Amplifier As described below use this list to identify and order replacement parts Parts Ordering Replacement parts are available from or through your local Tektronix Inc service Information center or representative Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to include the following information in your order Part number
24. ra ee re rien 200 mV Checks and Adjustments Part 4 input Current and impedance C Step 2 Examine the DMM for a reading of 0 0 mV within the limits of 2 0 mV DO NOT attempt to adjust the INPUT if it is within the stated limits Proceed to Step 9 Step 3 Adjust INPUT adjustment R521 on the A1 Main board for 0 0 mV See Figure 2 2 for adjustment locations Step 4 Set the DMM to the 200 Q range Step 5 Read the DMM m El O C Step 6 Reverse the BNC to banana connection on the DMM C Step 7 Read the DMM E Step 8 Examine the average DMM reading of Steps 5 and 7 for a value of 50 0 within the limits of 49 0 Q and 51 00 DO NOT attempt to adjust the Z IN if it is within the stated limits Proceed to Step 10 Step 9 Adjust Z IN adjustment R511 on the A1 Main board for 50 00 See Figure 2 2 for adjustment locations _ Step 10 The adjustments in Step 2 and 9 are interactive that is adjusting one may affect the adjustment of the other therefore repeat Steps 1 through 9 until both Steps 2 and 8 yield readings within the stated limits R521 R511 Input i Zin Figure 2 2 A1 Main Board Input Current and Impedance Adjustment Locations 11A71 Service Reference 2 15 Part 5a Low Frequency Transient Response Standard Procedure Compensation networks are adjusted to optimize the transient response The Standard Procedure requires the use of an 11400 Series mainframe to assur
25. the following settings in the order listed Center plug in CHET Display Onoff nn aa an on Mainftame oo eee cence ete nr nn no setting changes Power supply Output u ir ee el oh be wewaearas on Digital multimeter DMM MOJO y RR Anruf ee ee DC Ranges ee ee nee Auto if the environment is electrically noisy then connect a capacitor at least 0 1 pF across the input terminals of the DMM Press the Enhanced Accuracy button twice Immediately after self calibration has completed and passed perform this procedure it is helpful if you use a pocket calculator to do the calculations required for evaluating the data in this part If your DMM is equipped with a comparison or relative reference feature use this feature for the readings and calculation required in Steps 3 and 5 When connecting the alligator clips connect one clip to the power supply s negative terminal directly and the other clip to the 430 Q resistor not the power supply s positive terminal C Step 2 Select Vertical Cursors Step 3 Connect the alligator clips to the power supply and set the voltage so that the trace is within 0 2 divisions of the first graticule line above the bottom of the screen Read the DMM and record the absolute value that is ignore the polarity C Step 4 Set the Vert Ref cursor on the trace using the left function control knob with FINE resolution Step 5 Connect the alligator clips to the power supply and set
26. the mainframe s settings then perform the following settings in the order listed Amplifier CH 1 Display on off une na ee nad on Calibration generator ModE is wu oea E a E ee a a A SAIRA Std Amp Amplitude Output ai seinte nat dog ee ern 10V Mainframe Main Size or HORIZONTAL SIZE ow eee 100 us div Average N if available 20 0 eee eee On Check DC Balance by performing Step 2 C Step 2 Check the Vertical Size for each position from 10 mV through 1 V and observe that the trace stays within 0 2 divisions of center 2 28 Checks and Adjustments Part 9 Vertical Accuracy Check Gain by performing Steps 3 through 7 O O Step 3 Connect the calibration generator output to the CH 1 input using the 42 inch coaxial cable Step 4 Set the Vert Size or VERTICAL SIZE to 1 V div Note that the PG 506 outputs 10 V but only 5 V p p are seen at the amplifier input due to the loading by the 50 Q input impedance Step 5 Set the Vert Offset or VERTICAL OFFSET to 2 5 V Step 6 Select the Peak Peak measurement if available or the vertical amplitude Cursors and measure the peak to peak amplitude of the waveform Step 7 Check that the measurement is 5 V plus or minus 95 mV for the 11300 Series mainframe or 65 mV for the 11400 Series mainframe 11A71 Service Reference 2 29 Part 10 AC Coupling This part shows the setup and lists the procedure to check AC coupling Specifications The
27. the voltage so that the trace is within 0 2 divisions of the first graticule line below the top of the screen Read the DMM and add the absolute value to the reading obtained in Step 3 Step 6 Set the AVert cursor on the trace using the right function control knob with FINE resolution Read the AVert readout Step 7 Divide the sum obtained in Step 5 by the A readout obtained in Step 6 Then divide this result by the mainframe characterization factor obtained in Step 9 of the Procedure to Characterize 11300 Series Mainframe Step 8 Check that the result obtained in Step 7 is gt 0 985 but lt 1 015 11A71 Service Reference Part 12b AV DC Accuracy 11300 Series Mainframe Procedure C Step 9 Repeat Steps 3 through 8 for the vertical size settings listed below When testing with small voltages it may help to install attenuators in series between the BNC to alligator clip adapter and the coaxial cable so that you can set the voltages with better resolution You can also use a DC voltage calibrator to achieve better resolution when testing with small voltages 1 Vidiv 0 5 V div 0 2 Vidiv 0 1 V div 50 mV div 49 8 mV div 23 mV div 20 mV div 10 mV divw Checks and Adjustments Part 13 DC Offset Accuracy The system DC Offset is checked using a precision digital multimeter and a power supply The purpose of this procedure is to confirm that the amplifier can be accurately calibrated This procedure
28. topic Amplifier Hybrids under Corrective Maintenance later in this section for more information on Hypcon connectors Circuit boards and components must be dry before applying power to prevent damage from electrical shorts Visual Inspection The amplifier should be inspected occasionally for loosely seated or heat damaged components The corrective procedure for most visible defects is obvious However particular care must be taken if heat damaged parts are found Overheating usually indicates other problems in the instrument Therefore correcting the cause of overheating is important to prevent recurrence of the damage Periodic Electrical Adjustment To ensure accurate measurements check the electrical adjustment of this instrument after each 2 000 hours of operation or every 24 months if used infrequently Instructions are given in Section 2 Checks and Adjustments 3 2 Maintenance Corrective Corrective maintenance consists of Field Replaceable Unit FRU and FRU IC Maintenance replacement This section describes the techniques required to replace the FRUs in the amplifier Ordering Parts When ordering replacement parts from Tektronix Inc include the following information Amplifier type Amplifier serial number Description of the part if electrical include the circuit number m Tekironix part number Static Sensitive Device Classification Static discharge can damage any semiconductor compon
29. used in the Procedure to Check the Amplifier DC Offset Accuracy Setup to Check the Amplifier AV DC Offset Accuracy BNC T Connector Mainframe not connected yet 430 2 A 4 Resistor Coaxial Cables BNC to Alligator Digital Clip Adapter Multimeter BNO t0 Banana Adapter Setup to Check the Amplifier AV DC Accuracy 11A71 Service Reference 2 43 Part 13 DC Offset Accuracy Procedure to Check the Amplifier AV DC Offset Accuracy C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Center plug in CH 1 Display ooff onsas ia a er na ded on M lftame a o bree a Ta ya no setting changes Power supply Moletai EE Fee EE A E A oe gt E NT On Digital multimeter DMM Mode ne RT ead ee DC RANGO Ga es cussing ate oe ANa ab ee een ee Settee Auto if the environment is electrically noisy then connect a capacitor at least 0 1 uF across the input terminals of the DMM Press the Enhanced Accuracy button twice Immediately after self calibration has completed and passed perform this procedure When connecting the alligator clips connect one clip directly to the power supply s negative terminal and the other clip to the 430 Q resistor not the power supply s positive terminal C Step 2 Note the position of the displayed trace it should be near the center of the graticule If you are using the 11300 Series mainfra
30. volatile RAM NV RAM Test verifies that the NV RAM is functioning properly Since the NV RAM contains calibration information which must remain undamaged this test does not alter critical data If the testing algorithm detects a failure then the amplifier reports a fault code of 1 and repeatedly loops the NV RAM Tesi The instrument continues looping the NV RAM Test until the power is removed Until the condition causing the NV RAM Test to fail is corrected the mainframe does not recognize the amplifier The NV RAM Test could corrupt calibration data stored in the NV RAM if the power is cycied or removed during this test If corruption occurs then the Calconstant Checksum is corrupted as well Furthermore at the next power up the amplifier resets the calibration constants to defauit ROM settings and reports a amplifier calconstant checksum error during mainframe invoked Power up Diagnostics After the mainframe amplifier system is run through an Enhanced Accuracy cycle the amplifier is once again properly calibrated Test 2 The Housekeeper IC Test verifies the functionality of the House keeper IC The Housekeeper IC performs many housekeeping chores of the amplifier including channel sequencing refreshing the analog control voltage system latching amplifier step gain settings and the communications with the mainframe This test exercises this IC and records the ICs reactions using an algorithm similar to the algorithm that signat
31. 0 1 CIRCUIT BD ASSY FRONT PANEL 80009 870 9336 00 SEE A2 ATTACHING PARTS 13 211 0398 00 8010100 8010508 2 SCREW MACHINE 2 56 X 0 312 FLH 82 DEG STL 80009 211 0398 00 211 0413 00 8010509 2 SCREW MACHINE 2 56 X 0 375 FLH 82 DEG STL 93907 ORDER BY DESCR END ATTACHING PARTS 14 174 0159 00 1 CA ASSY SP ELEC 6 26 AWG 3 0 L RIBBON 80009 174 0159 00 15 426 2061 00 1 FR SECT PLUG IN LOWER ALUMINUM 80009 426 2061 00 16 334 3540 00 1 MARKER IDENT MARKED WARNING 80009 334 3540 00 17 131 3589 00 1 CONN ASSY ELEC FRONT PNI 80009 131 3589 00 ATTACHING PARTS 18 211 0398 00 8010100 8010508 4 SCREW MACHINE 2 56 X 0 312 FLH 82 DEG STL 80009 211 0398 00 211 0413 00 8010509 4 SCREW MACHINE 2 56 X 0 375 FLH 82 DEG STL 93907 ORDER BY DESCR END ATTACHING PARTS 19 354 0654 00 1 RING CONN ALIGN BNC 80009 354 0654 00 20 174 0205 00 1 CABLE ASSY RF 50 OHM COAX 2 6 L 80009 174 0205 00 174 0665 00 1 CABLE ASSY RF 50 OMM COAX 13 3 L 800098 174 0665 00 343 0549 00 1 STRAP TIEDOWN E 0 091 W X 4 0 L ZYTEL 06383 PLTIM 21 119 2397 00 1 ATTENUATOR 5 STAGE PROGRAMMABLE TK1831 119 2397 00 ATTACHING PARTS 22 211 0409 00 2 SCR ASSEM WSHR 4 40 X 0 312 PNH STL 93907 ORDER BY DESCR END ATTACHING PARTS 23 174 0559 00 1 CA ASSY SP ELEC 20 28 AWG 2 25 L RIBBON 80008 174 0859 00 24 426 2060 00 1 FR SECT PLUG IN UPPER ALUMINUMN 80009 426 2060 00 25 334 3438 00 1 MARKER IDENT MARKED TURN OFF POWER 80009 334 3438 00 26 214 1061 00 1 CONTACT E
32. 6 Checks and Adjustments Using These The first time user should familiarize themselves with the proceeding information Procedures prior to performing the procedures in the parts that follow Conventions in this Manual In these procedures the following conventions are used CAPITAL letters within the body of text identify front panel controls indicators and connectors for example MEASURE on the mainframe and amplifier Bold letters identify menu labels display messages and commands typed in from a terminal or controller Initial Capital letters identify connectors controls and indicators for example Position on associated test equipment Initial Capital letters also identify adjustments inside the amplifier for example Vert Pos a In some steps the first word is italicized to identify a step that contains a performance verification and or an adjustment instruction For example if Check is the first word in the title of a step an electrical specification is checked If Adjust appears in the title the step invoives an electrical adjustment If Examine is the first word in the title the step involves measurement limits that are used as calibration guides these limits are not to be interpreted as electrical specifications A heading system is used to readily identify the steps that contain performance verification and or adjustment instructions For exampie if Check is the first word in the title of a step an
33. ACN 2 24 Checks and Adjustments Part 6 Bandwidth C Step5 Check that the amplifier amplitude computed by dividing column 5 by column 2 Is at least the value shown In column 6 C Step6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 1 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 1 V div 4 gt 0 575 1000 500 mV div 6 gt 0 863 i 1000 50 mV div 6 20 863 4 1000 20 mV div 6 gt 0 863 1000 10 mv div 6 gt 0 863 soo 10 mV div 6 gt 0 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes ieee 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 500 1 V div 4 20 617 500 500 mV div 6 gt 0 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 gt 0 925 500 10 mV div 6 gt 0 925 2 24 Checks and Adjustments Part 6 Bandwidth C Step 5 Check that the amplifier amplitude computed by dividing column 6 by column 2 is at least the value shown in colurnn 6 C
34. AV DC Accuracy BNC T Mainframe Connector 430 Q Resistor Digital Multimeter BNC to Alligator Clip Adapter not connected yet Setup to Check the Amplifier AV DC Accuracy Procedure to Check the Amplifier AV DC Accuracy C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Center plug in 241 Display ON ann een on Maintrame 7 ee no setting changes Power supply OUTIL siias ee ar eh ee ee ne abs neice on 2 34 Checks and Adjustments Part 12a AV DC Accuracy 11400 Series Mainframe Procedure Digital multimeter DMM MOC 6 6 6 nba Rec eens ee aan ees DC If the environment is electrically noisy then connect a capacitor at least 0 1 uF across the input terminals of the DMM Press the Enhanced Accuracy button twice Immediately after self calibration has completed and passed perform this procedure It is helpful if you use a pocket calculator to do the calculations required for evaluating the data in this part If your DMM is equipped with a comparison or relative reference feature use this feature for the readings and calculation required in Steps 3 and 5 When connecting the alligator clips connect one clip directly to the power supply s negative terminal and the other clip to the 430 resistor not the power supply s positive terminal C Step 2 Set Average N to On select Mean whole zone in the MEASURE major menu an
35. Al Main Board Figure 3 5 Location of Screws and Parts for Removal of an Attenuator 3 14 Maintenance Corrective Maintenance Remove the A1 Main Board as follows OOo O CO DO m u a O DD Step 1 Remove the A3 Kernel board Step 2 Unplug the coaxial connector from the input of the Attenuator Step 3 Unplug the probe information connectors from the A1 Main board place your index finger under the metal contacts and your thumb on top and lift the seven metal contacts out of the plastic block on the A1 Main board Step 4 Use a narrow shank Torx T 10 screwdriver to remove the six screws and nut blocks that secure the A1 Main board to the top and bottom frames Figures 3 6 and 3 7 show nut blocks Step 5 Use a Torx T 15 screwdriver to remove the four screws that fasten the plastic rear panel to the top and bottom frames Step 6 Carefully withdraw the Ai Main board from between the frames Step 7 Remove the rear panel from the A1 Main board Install the A1 Main Board as follows Step 8 Set the amplifier on its side with the pushbuttons up Reinstall the rear panel on the A1 Main board Step 9 Carefully insert the A1 Main board between the frames until the plastic rear panel contacts the top and bottom frames The board fits on the top of the center ridges on the top and bottom frames Step 10 Use a Torx T15 screwdriver to install the four screws that fasten the rear panel to the top and b
36. DC voltage calibrator to achieve better resolution when testing with small voltages 1 Vidiv 0 5 V div 0 2 Vidiv 0 1 V div 50 mV div 49 8 mV div 23 mV div 20 mV div 10 mV div 2 36 Checks and Adjustments Part 12b AV DC Accuracy 11300 Series Mainframe Procedure The system AV DC Accuracy is checked using a precision digital multimeter and power supply The system must be in Enhanced Accuracy mode during this procedure The purpose of this procedure Is to confirm that the amplifier can be accurately calibrated This procedure does not test for mainframe calibration voitage reference accuracy or long term stability Therefore the mainframe is characterized and tests must be performed immediately after an Enhanced Accuracy calibration Also the amplifier specifications are more stringent than those in the 11471 User s Reference Supplement Specification AV DC Accuracy within 1 5 Setup to Characterize the 11300 Series Mainframe Note After entering Extended Test verify that your mainframes firmware is Version V2 4 or higher If your mainframe s firmware version is lower than V2 4 then you cannot perform this procedure Calibrator Output Mainframe BNC to Banana Adapter Digital Multimeter Coaxial Cable Setup to Characterize the 11300 Series Mainframe Procedure to Characterize the 11300 Series Mainframe C Step 1 Perform the following settings Center PUGIN A 12 er en
37. Ea no setting changes Mainframe UTILITY major MENU o irere ie ninaiona r eee ence teens Ext Test R N ZN aa rn DER Sense eect Ane BOCK a Re Anina Front Panel PROB eos un ee een Wa een hea eb ad FP Calibrator Routine nung ee ehe 9 9988 V BOOP ana ES nen en ent Run T1A71 Service Reference Part 12b AVDC Accuracy 11300 Series Mainframe Procedure Digital multimeter DMM Moden nennen es rem age DC Step 2 Record the DMM reading Step 3 Select Run Step 4 Select Routine and set to 9 9939V Step 5 Select Run Step 6 Record the DMM reading Step 7 Select Run Step 8 Press the UTILITY button CEP CA Ed Step 9 Add the absolute values of the DMM readings obtained in Steps 2 and 6 Divide the result by 19 9927 to obtain the mainframe s calibration voltage reference characterization factor which is used in the Procedure to Check the Amplifier AV DC Accuracy Setup to Check the Amplifier AV DC Accuracy BNC T Connector Mainframe 11A71 430 2 Coaxial Cables fe ee NE ey Resistor Digital Multimeter BNC to BNC to Alligator Banana Adapter Clip Adapter not connected yet 50 Q Termination not connected yet Setup to Check the Amplifier AV DC Accuracy 2 38 Checks and Adjustments Part 12b AV DC Accuracy 11300 Series Mainframe Procedure Procedure to Check the Amplifier AV DC Accuracy C Step 1 First Initialize the mainframe s settings then perform
38. L BATTERY 0S1220 24 37 670 9735 00 8010100 8010508 1 CIRCUIT BD ASSY MAIN 80009 670 9735 00 670 9735 01 8010508 1 CIRCUIT BD ASSY MAIN 80009 670 9735 01 SEE AL 38 159 0253 00 2 FUSE CARTRIDGE 0 250A 125V FAST SUBMIN 75915 251 250 TAR TL 5 4 Replaceable Parts 1iA71 Fig amp Index Tektronix Serial Assembly No Mfr No Part No Effective Dscont Qty 12345 _ Name amp Description Code Mfr Part No 1 39 159 0235 00 2 FUSE WIRE LEAD 0 75A 125V FAST 80009 159 0235 00 40 386 5296 00 1 PANEL REAR 80009 386 5296 00 ATTACHING PARTS 41 213 0904 00 4 SCREW TPG TR 6 32 X 0 5 PNH STL 83385 ORDER BY DESCR END ATTACHING PARTS STANDARD ACCESSORIES 070 6288 01 1 MANUAL TECH USERS REFERENCE 11A71 80009 070 6288 01 070 6699 01 1 PROCEDURE INCOMING INSPECTION L1A71 80009 070 6699 01 OPTIONAL ACCESSORIES 070 6787 01 1 MANUAL TECH SERVICE REF 11A73 80003 070 6787 01 Replaceable Parts LIA7i 5 5
39. LEC GROUNDING CU BE 800098 214 1061 00 27 337 1064 12 2 SHIELD ELEC SIDE FOR PLUG IN UNIT 80008 337 1064 12 28 220 0022 00 6 NUT BLK 0 4 X 0 25 X 0 33 4 40 THRU NI SIL 800098 220 0022 00 ATTACHING PARTS 29 211 0409 00 6 SCR ASSEM WSHR 4 40 X 0 312 PNH STL 93907 ORDER BY DESCR END ATTACHING PARTS 30 174 0560 00 1 CA ASSY SP ELEC 16 28 AWG 2 75 L RIBBON 80009 174 0560 00 3L 670 9747 00 1 CIRCUIT BD ASSY KERNEL 80009 670 9747 00 SEE A3 ATTACHING PARTS 32 211 0409 00 4 SCR ASSEM WSHR 4 40 X 0 312 PNH STL 93907 ORDER BY DESCR END ATTACHING PARTS KERNAL BOARD ASSEMBLY INCLUDES 33 156 1684 01 1 MICROCKT DGTL MICROCOMPUTER 8 BIT 34649 P8031AH 34 156 2625 00 1 MICROCKT DGTL NMOS CUSTOM SENESCHAL 80009 156 2625 00 35 160 4065 02 8010100 8010196 1 MICROCKT DGTL HMOS 16385 X 8 EPROM PRGM 80009 160 4065 02 160 4065 03 8010197 8011287 1 MICROCKT DGTL HMOS 18385 X 8 EPROM PREM 80009 160 4065 03 160 4065 04 8011288 8011318 L MICROCKT DGTL HMOS 16385 X 8 EPROM PRGM 80009 160 4065 04 160 4065 05 8011319 8011563 1 MICROCKT DGTL HMOS 16385 X 8 EPROM PRGM 80009 160 4085 05 160 4065 06 8011564 8011994 i MICROCKT DGTL HMOS 16385 X 8 EPROM PROM 80009 160 4065 06 160 4065 07 8011995 8012182 1 MICROCKT DGTL HMOS 16385 X 8 EPROM PRGM 30003 160 4065 07 160 4065 08 8012183 1 MICROCKT DGTL HMOS 16385 X 8 EPROM PREM 80009 160 4065 08 36 156 2671 00 1 MICROCKT DGTL CMOS 2048 X 8 SRAM MDL W 80009 156 2671 00 INTEGRA
40. O BOX 500 83385 MICRODOT MFG INC 3221 W BIG BEAVER RD TROY MI 48098 GREER CENTRAL DIV 91260 CONNOR SPRING AND MFG CO 1729 JUNCTION AVE SAN JOSE CA 95112 A SLOSS AND BRITTAN INC CO 92101 SCHULZE MFG 50 INGOLD RD BURLINGAME CA 94010 2206 93907 TEXTRON INC 600 18TH AVE ROCKFORD IL 61108 5181 CAMCAR DIV TK1326 NORTHWEST FOURSLIDE INC 18224 SW 100TH CT TUALATIN OR 97062 TK1831 PACIFIC HYBRID MICROELECTRONICS INC 7790 SW NIMBUS AVE BEAVERTON OR 97005 BLDG 10 Replaceable Parts 11471 5 3 Fig amp Index Tektronix Serial Assembly No Mfr No Part No Effective Dscont Qty 12345 _ Name amp Description Code _Mfr Part No 1 1 386 0800 00 1 PUSH BUTTON 0 269 X 0 409 ABS 80009 366 0600 00 2 366 1058 00 1 KNOB GRAY 0 625 X 0 255 X 0 485 80009 366 1058 00 ATTACHING PARTS 3 214 1095 00 1 PIN SPRING 0 187 L X 0 094 00 STL CD PL 22599 52 022 094 0187 END ATTACHING PARTS 4 105 0076 04 1 RELEASE BAR LCH PLUG IN UNIT 80009 105 0076 04 5 214 1280 00 1 SPRING HLCPS 0 14 OD X 1 126 L TWIST LOOP 91260 ORDER BY DESCR 6 214 1054 00 1 SPRING FLAT 0 825 X 0 322 SST TK1326 ORDER BY DESCR 7 105 0075 00 1 BOLT LATCH 80009 105 0075 00 8 333 3409 00 1 PANEL FRONT 80003 333 3409 00 ATTACHING PARTS 9 211 0392 00 4 SCREW MACHINE 4 40 X 0 25 FLH 82 DEG STL 80009 211 0392 00 END ATTACHING PARTS 10 348 0235 00 2 SHLD GSKT ELEK FINGER TYPE 4 734 L 92101 ORDER BY DESCR 11 386 5219 00 1 SUBPANEL FRONT 80009 386 5219 00 12 670 9336 0
41. Part Number U505BG a 28 pin type to remove the IC An illustration of the pliers is shown in Figure 3 4 C Step 2 Position the pliers around the outside of the IC Squeeze the handles to grasp the IC and slowly pull it from the socket Avoid touching the removed IC pins or socket contacts with your fingers Finger oils can lessen contact reliability Install the DIP IC as follows x C Step 1 Grasp the IC with the Insertion Extraction Pliers Check that all the IC pins are straight and evenly spaced C Step 2 Do not use the IC label as an index Look for the index on the IC body Align the index slot with that of the A1U700 Processor IC undemeath it Figure 3 2 gives an illustration of this indexing C Step 3 Align the pins with their respective socket contacts and slowly seat the IC Note The Unit identification UID is identical to the amplifier s serial number and is stored in NV RAM If the EPROM is replaced it is necessary to enter a UID number The amplifier s UID must be re entered to generate and store the checksum Failure to re enter the UID will result in the serial number diagnostic failure during power up self testing Entry of the UID is described in this section refer to Programming The Unit Identification Figure 3 4 IC insertion Extraction Pliers 11A71 Service Reference 3 11 Corrective Maintenance 3 12 Circuit Board and Attenuator FRU Removal Remove the Front Panel as foll
42. Reference Supplement and this procedure must be performed immediately after Enhanced Accuracy calibration Specification Balance within 40 2 division Setup to Check DC Balance Maintrame Setup to Check DC Balance Procedure to Check DC Balance C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Center plug in CHT Dismay Omon naeh cab on Manama ns acca c isis ee ee no setting changes C Step 2 Check that the displayed trace position is at the center graticule line within 40 2 division for each Vertical Size setting If you are using the 11300 Series mainframe use Vertical Cursors to help measure the trace position If you are using the 11400 Series mainframe set Average N to On and use Mean whole zone in the Measurement pop up menu to help measure the trace position Checks and Adjustments Part 12a AV DC Accuracy 11400 Series Mainframe Procedure The system AV DC Accuracy is checked using a precision digital multimeter and power supply The system must be in Enhanced Accuracy mode during this procedure The purpose of this procedure is to confirm that the amplifier can be accurately calibrated This procedure does not test for mainframe calibration voltage reference accuracy or long term stability Therefore the mainframe is characterized and tests must be performed immediately after an Enhanced Accuracy calibration Also the amplif
43. Response Adjustment Locations 0 0 0 0 ce cece rennen 2 18 Waveform with AC Coupling Selected 2 31 Field Replaceable Units FRU Locator and A1 Main Board Securing Hardware 6 eee een eee 3 5 Semiconductor Indexing Diagram 2 22 eee ee eee ee 3 7 Hypcon Assembly Removal and Replacement 3 10 IC Insertion Extraction Pliers 2 0 0 cece eee eee 3 11 Location of Screws and Parts for Removal of an Attenuator 3 14 Location of a Nut Block Securing the Circuit Board to the Frame Section oaaae ee dane la tees 3 16 Locations of the Nut Blocks for Removal of the A1 Main Board neue een de 3 16 Indexing of Multi pin Connectors 2 0 00 cece cece 3 18 Sample LED Fault Code Timing Diagram 0 00 6 3 20 11A71 Amplifier Block Diagram 2 222 00 0 0 c eee 42 Measurement Limits Specifications Adjustments and FUNCHONG Test ccd ns otha Roca denned in 2 1 TESEEALIPMENE u a an ae wages Rew er me es 2 4 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 2 24 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes aecenas eer dee Pees slew awa w awed en 2 24 11A71 Amplifier DC Offset Accuracy 0 00000 2 45 Relative Susceptibility to Damage from Static Discharge 3 4 Board FRU ne eg eh clan ange ged 3 23 Component Module FRUS 2 0 0 cee eee 3 24 Amplifier Kernel Error Index Codes 00 0 000 ee 3 24 Self Tests Extended Diagnostics Error index Codes 3
44. V div 6 gt 0 863 500 10 mV div 6 gt 0 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes 1 2 3 a 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 500 1 V div 4 0 617 500 500 mV div 6 gt 0 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 gt 0 925 500 10 mV div 6 gt 0 925 Ener are INCA A eA Et eee 2 24 Checks and Adjustments Part 6 Bandwidth g Step 5 Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 C Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 1 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifler only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 TEY S 1 V div 4 gt 0 575 1000 5 32 500 mV div 6 gt 0 863 1000 Sy 50 mV div 6 20 863 1000 S32 20 mv div 6 a gt 0 863 10 mV div re tan rare a 500 53 77 10 mV div 6 220 863 20 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainfra
45. Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 500 1 V div 4 gt 0 617 500 500 mV div 6 gt 0 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 270 925 500 10 mV div 6 gt 0 925 2 24 Checks and Adjustments Part 6 Bandwidth C Step Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 C Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 1 2 3 4 6 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 1 V div 4 2 0 575 1000 500 mV div 6 gt 0 863 1000 50 mV div 6 gt 0 863 1000 20 mV div 6 gt 0 863 5 4000 10 mv div 6 20 863 500 10 mV div 6 gt 0 925 1 2 3 4 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Dispiayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 500 1 V div 4 gt 0 617 500 500 mV div 6 20 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 gt 0 925 500 10 mV div 6 gt 0 925 ha es cette et eRe RACER nee NN
46. ainframe to a qualified service person Checks and Adjustments Part 1 Initial Setup New Configuration Calibration When an amplifier is first installed in a mainframe or when one is moved to a different compartment in the mainframe the mainframe will be in a new configuration state After the mainframe executes the diagnostics it will recalibrate itself for the new configuration During this calibration the message Powerup new configuration partial calibration occurring will appear on the display If the calibration is successful as indicated by a message the mainframe will enter the normal operating mode Completion When the mainframe completes the diagnostics and the new configuration calibration without a failure then it has passed this part of the procedure 11A71 Service Reference 2 9 Part 2 Enhanced Accuracy When displayed the Enhanced Accuracy symbol EA indicates that the instrument is at its highest Accuracy state The mainframe saves the time of calibration and ambient temperature for use in maintaining the Enhanced Accuracy state For more information about the Enhanced Accuracy state see Enhanced Measurement Accuracy Indicator in the mainframe User Reference manual While Enhanced Accuracy is in effect to verify the DC measurement accuracy of the amplifier and mainframe system apply and monitor test voltages and compare these test voltages with the measurements made on the screen Speci
47. ame If the amplifier is tested in a mainframe of lower bandwidth then specified performance is ensured only in mainframes of equal or lower bandwidth Specifications Performance Verification Refer to Tables 2 3 and 2 4 for the bandwidth specifications Use either Table 2 3 or 2 4 depending on the type of mainframe you are using Specifications Functional Test A peak peak measurement gt 848 mV Setup to Examine Mainframe Bandwidth Mainframe Signal Leveled Stand Sine Wave Generator cet Output Coaxial Cable Setup to Examine Mainframe Bandwidth Procedure to Examine Mainframe Bandwidth C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Mainframe WVEM 23 ne a ea Bok dudes od ai C center Trigger Source un ann ans lan ehe C center Main Size or HORIZONTAL SIZE oe eee 10 us div LON eTo m ee ae not used in this step Signal Standardizer Test a ee Bere nee Vert or Horiz Freq Resp Leveled sine wave generator FREQUENOY ae ans age serie aa reference 11A71 Service Reference 2 21 Part 6 Bandwidth 2 22 The reference frequency must be between 50 kHz and 6 MHz o O a Step 2 Set the leveled sine wave generator output amplitude so that the Signal Standardizer CW Leveled light is on Ensure that the light remains on throughout the following steps Step 3 Set the signal standardizer Position and Amplitude for a 6 division disp
48. amplifier combination This limit is displayed as BW Limit WAVEFORM button on the 11400 Series mainframe or HF Limit VERTICAL SIZE button on the 11300 Series mainframe Step 5 Set the Main Size or HORIZONTAL SIZE to display several is of the waveform Step 6 Check that the measurement is at least 848 mV 70 7 of Step 9 Step 7 Set the CH 1 display on off button to off 2 E Step 8 Move the coaxial cable to the CH 2 input and set its display on off to on 11A71 Service Reference 2 25 Part 7 Overioad This part shows the setup and lists the procedure to check overload Specification Coupling changes to off Setup to Check Overload Mainframe BNC to Dual Banana 42 inch Coaxial Cable Setup to Check Overioad Procedure to Check Overload C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Malnttame ner no setting changes Amplifier CH 1 Display on off as een on Power supply VORG ua cd ch aa ae en Ta ARE Rem cs 20V URGE ENT ee NE buen ER ae 400 MA In the following steps IMMEDIATELY disconnect the cable at the input if the impedance does not change within 3 seconds Step 2 Connect the power supply to the CH 1 input using the 42 inch coaxial cable Step 3 Check that the Coupling changes to Off Step 4 Disconnect the power supply at the input Step 5 Set the Coupling back to DC
49. as stored settings calibration constants etc This could affect normal instrument operation in unpredictable ways If this occurs refer to Restoring Calibration Data later in this section After the amplifier is powered up and the MPU has reset the amplifier begins a sequence of test routines to determine if its kernel systems are operating properly If any of these tests fails then it is unlikely that the amplifier can communicate failure information to the mainframe The flashing of a fault code on the front panel CH 1 LED indicates a particular failure This fault code indicates which Kemel Test is failing 11A71 Service Reference 3 19 Diagnostic Troubleshooting The following description explains how to read the fault code Count 1 if the amplifier Kernel Tests detect a fault then the CH 1 LED is flashed eight times to display a fault code Each time the CH 1 LED tums on count the occurrences If the CH 1 LED is lit twice as long that is during one cycle CH 1 is lit for twice the normal pulse width then the test corresponding to the current count accumulated is the one which failed Refer to the timing diagram in Figure 3 9 for an example LED fault code The timing diagram illustrates a test number 2 failure 2 3 4 5 6 7 8 On CH1 LED Off Figure 3 9 Sample LED Fault Code Timing Diagram The Kernel Tests are 1 2 Non volatile RAM Test Housekeeper IC Test Test 1 The non
50. ate Procedure 2 0 ic cee e cece een ence eee eees 2 19 Procedure to Examine Adjust Low Frequency Transient Response Alternate Procedure ig es ack ha sake pode bea ke eee Keane 2 19 Patt 6 B ndwidii oee 6 52 io NG esa een wid date tie iri 2 21 Specifications Performance Verification 2 0 0 0 0 6 c eee eee 2 21 Specifications Functional Test 2 0 0 6 eee ee eens 2 21 Setup to Examine Mainframe Bandwidth 0 0 00 ee eee 2 21 Procedure to Examine Mainframe Bandwidth 0 006 2 21 Setup to Check Amplifier Bandwidth Performance Verification Procedura annon sea ad nen NE ae eek ea BER OE 2 23 Procedure to Check Amplifier Bandwidth Performance Verification Procedu ana vem ea Med cade baled Ree ok Aad eh cake ee 2 23 Setup to Check Amplifier Bandwidth Functional Test Procedure 2 25 Procedure to Check Amplifier Bandwidth Functional Test Procedure 2 25 PART OVGNOAG nun en ds Kies he Beane eR 2 26 Specticatl n meos nr ae ae naar 2 26 Setup to Check Overload 22 cece cece eens 2 26 Procedure to Check Overload 0 ee ce eee eee 2 26 Parl 9 Input Resistance nase na 2 27 Specification nn een ehe een 2 27 Setup to Check Input Resistance 0 0 0 cee 2 27 Procedure to Check Input Resistance 0 0 02205 2 27 Part 9 Vertical ACOWGCY nu an ee bes dg pee eda wale 2 28 SPSCHCSUONE iao cea eek on ae pepe eae sd Dea SEE RE aS 2 28 Setup to Check Vertical Accuracy 2 0 0 eee eee
51. calibration voltage reference characterization factor which is used in the Procedure to Check the Amplifier DC Offset Accuracy Setup to Characterize the 11300 Series Mainframe Note After entering Extended Test verify that your mainframe s firmware is Version V2 4 or higher if your mainframe s firmware version is lower than V2 4 then you cannot perform this procedure Calibrator Output Mainframe i BNC to Banana Adapter Digital Multimeter Coaxial Cable Setup to Characterize the 11300 Series Mainframe Procedure to Characterize the 11300 Series Mainframe C Step 1 Perform the following settings Center plug in nn ne eur anne no setting changes Mainframe UTILITY major MENU ran ern Ext Test BQO 2 2 seen ae Front Panel ATGA ernennen ea FP Calibrator Ro uline nn ee een 9 9988 V LOOP E EEEE E AEA ra ee ee ent a ERTIES en wees RER antes 2 42 Checks and Adjustments Part 13 DC Offset Accuracy Digital Multimeter DMM 22 2005 no setting changes Step 2 Record the DMM reading Step 3 Select Run Step 4 Select Routine and setto 9 9939 Step 5 Select Run Step 6 Record the DMM reading Step 7 Select Run Step 8 Press the UTILITY button ODOODDOD UODOD Step 9 Add the absolute values of the DMM readings obtained in Steps 2 and 6 Divide the result by 19 9927 to obtain the mainframe s calibration voltage reference characterization factor which is
52. cate the UID jumper A3J400 on the A3 Kernel board as shown in Fig 3 1 The jumper should be on pins 2 and 3 in its normal position Remove the jumper and install it on pins 1 and 2 3 16 Maintenance 11A71 Service Reference E C C Corrective Maintenance Step 3 Install the amplifier into any compartment Turn the power on Wait until the Diagnostics checks are completed Step 4 At the Terminal type the command UID Left Center Right lt Serial Number gt Left Center Right refers to the name of the compartment Step 5 At the Terminal type the query UID Left Center Right Observe that the correct UID is reported Step 6 Set the ON STANDBY switch to STANDBY Step 7 Remove the amplifier Step 8 Reinstall the jumper A3J400 to its normal position on the K3 Kernel board BNC Connectors Remove a Connector Assembly as follows J m oO O E Step 1 Remove the front panel Step 2 Unplug the coaxial connector from the back of the connector assembly Figure 3 1 shows the locations of the connectors Step 3 Unplug the cable from the A2 Front Panel board at the connector on the Ai Main board Step 4 Unplug the probe information connectors from the Ai Main board place your index finger under the metal contacts and your thumb on top and lift the seven metal contacts out of the receptacie on the A1 Main board The probe information cable is a flat flexible seven conductor cabl
53. d connectors Adapter BNC to Alligator BNC Female to Clip leads Tektronix Part 013 0076 00 Clips i Attenuator 10X Impedance 50 Q one Tektronix Part 011 0059 02 male and one female BNC Pa connector Adapter BNC to Banana BNC Female to Dual Tektronix Part 103 0090 00 v j 2 required Banana Connector Adapter T BNC T Two female and Tektronix Part 103 0030 00 vr j one male BNC connector d 50 Q Termination Impedance 50 Q Tektronix Part 011 0049 01 Accuracy within 2 Fa connectors BNC 11A71 Service Reference 2 5 Description Resistor Alignment Tool insulated siot Magnetic Screwdriver Torx Screwdriver Tips Integrated Circuit Extracting Tools Needle nose pliers Tweezers Static Control Mat Wrist Strap Table 2 2 Test Equipment cont Minimum Specification 430 Q 10 tolerance power rating 1 W Insulated slot Holder for Torx tips 6 tip 7 tip 8 tip 10 tip 10 tip narrow shank 15 tip Examples of Recommended Test Equipment Tektronix Part 303 0431 00 Tektronix Part 003 0675 01 Tektronix Part 003 0293 00 Tektronix Part 003 1415 00 Tektronix Part 003 1293 00 Tektronix Part 003 0964 00 Tektronix Part 003 0814 00 Tektronix Part 003 0815 00 Tektronix Part 003 0966 00 Functional Test IC insertion extraction pliers 28 pin type General Tool P N US505BG or equivalent Tektronix Part 006 3414 00 Tektronix Part 006 3415 00 2
54. d set Compare to On C Step 3 Connect the alligator clips to the power supply and set the voltage so that the trace is within 0 2 division of the first graticule line above the bottom of the screen Read the DMM and record the absolute value that is ignore the polarity C Step 4 Select Save Current Meas Value as References in the Compare and Reference pop up menu of the MEASURE major menu Step 5 Connect the alligator clips to the power supply and set the voltage so that the trace is within 40 2 division of the first graticule line below the top of the screen Read the DMM and add the absolute value that is ignore the polarity to the reading obtained in Step 3 Step 6 Read the AMean value in the MEASURE major menu LI Step 7 Divide the sum obtained in Step 5 by the A readout obtained in Step 6 Then divide this result by the mainframe characterization factor obtained in Step 9 of the Procedure to Characterize 11400 Series Mainframe C Step 8 Check that the result obtained in Step 7 is gt 0 992 but lt 1 008 11A71 Service Reference 2 35 Part 12a AV DC Accuracy 11400 Series Mainframe Procedure C Step 9 Repeat Steps 3 through 8 for the vertical size settings listed below When testing with small voltages it may help to install attenuators in series between the BNC to alligator clip adapter and the coaxial cable so that you can set the voltages with better resolution You can also use a
55. der light for dust hair lint etc If the etched circuit board surfaces require more cleaning scrub with a soft rubber eraser Blow or vacuum clean while dusting the surface with a smail clean brush If the hybrid and elastomer contact holder are contaminated clean them by flushing or spraying with alcohol Do not scrub with a cotton tipped swab or similar device Cotton fibers may adhere to the contacts If the contact holder is excessively contaminated replace it with a new one Tighten the mounting screws with two inch pounds of torque 2 3 centimeter kilograms to secure the Hypcon to the circuit board 3 7 Corrective Maintenance Make sure that the elastomer is properly seated in the contact holder before remounting the assembly to the circuit board Use care when mounting the whole assembly to the circuit board to prevent misalignment between the connector and board Because of close tolerances involved special care must be taken to ensure correct index alignment of each Hypcon part during reassembly Fig 3 3 shows the index locations Failure to do so can result in a cracked hybrid substrate Removing Replacing the Hypcon Assemblies When replacing the Hypcon Hybrid printed circuit connector do not touch the elastomer s gold plated contacts with your finger instead use a cleaner which will not lessen contact reliability The Hypcon socket contacts are fragile Therefore refer to the cautions that follow wh
56. djustments cont Part 13 DC Offset Accuracy nase seen 2 41 SPECHICAUONS ors ne ee ee er ren ee en ne 2 41 Setup to Characterize the 11400 Series Mainframe 2 41 Procedure to Characterize the 11400 Series Mainframe 2 41 Setup to Characterize the 11300 Series Mainframe 2 42 Procedure to Characterize the 11300 Series Mainframe 2 42 Setup to Check the Amplifier DV DC Offset Accuracy 2 43 Procedure to Check the Amplifier DV DC Offset Accuracy 2 44 Maintenance Preventive Maintenance ass en 3 1 Amplifier Shield Removal 0 00 e cence eee eens 3 1 BANG ren a ns unteren ler 3 1 Visual Inspection 3 2 Periodic Electrical Adjustment 0 cece eee ee 3 2 Corrective Maintenance 3 3 Ordering Parts 3 3 Static Sensitive Device Classification 20 0 eee 3 3 Removing and Replacing FRUS 0 0000 02 c cece ene ee 3 4 Removing Replacing FRU ICs 200 cee eee eee 3 6 Removing Replacing the U350 Hypcon Assembly 3 8 Circuit Board and Attenuator FRU Removal 6 0000 c eee 3 12 Programming The Unit Identification 0 0 2 3 16 BNC CONNECTS nase el 3 17 Multi Pin Connectors 0 00 cece cece eee rennen 3 18 Diagnostic Troubleshooting 0 0 0 6 cette teenies 3 19 Diagnostics Overview 0 cece nee eee 3 19 New Configuration Calibration 0 0 0 eee 3 22 Restoring Calibration Data 0 6
57. e Step 5 Use a Torx T 6 screwdriver to remove the four screws that fasten the connector assembly to the front subpanel C Step 6 Remove the connector assembly from the amplifier Install a Connector Assembly as follows Step 1 Set the gray connector alignment ring on the connector with its index on the inside of the connector assembly The inside is the side where the flat cable enters the connector assembly Step 2 Insert the connector and the connector alignment ring into the hole in the front subpanel Check that the flat cable faces the inside of the amplifier and the index on the connector alignment ring fits into the notch in the front subpanel Step 3 Use a Torx T 6 screwdriver to install the four screws that fasten the connector assembly to the front subpanel 3 17 Corrective Maintenance C Step 4 Plug the probe information connector into its receptacle on the At Main board C Step 5 Plug the coaxial connector from the attenuator into the connector assembly For best results proceed as follows Check that the center conductor is straight Straighten if necessary w Plug the connector straight into the receptacle C Step 6 Plug the A2 Front Panel board cable connector into the A1 Main Board I Step 7 Install the front panel Mufti Pin Connectors Pin 1 on a multi pin connector is designated with a triangle or arrowhead on the holder A square pad on the circuit board denotes pin 1
58. e Area Error Index Suspect Module Suspect Board Hybrid or FRU s IC FRU s Relay Drr Group 1111 Kernel Probecodes Group 1121 Kerne Cksm Plug Group 11312 RAM Kerne Cksm Probe Group 11412 RAM Kernel Serial Sum Group 1151 RAM Kerne ADC Test Group II 1211 Kerne Fuse Test Group II 1221 FUSE Kerne Protection Group II 1231 HK Main Kernel ACUS Test Group Ill 1311 HK Kernel Cal Measure Meas Sys 1511 Main Kernel Cal Sigpth Meas Sys 1521 Att Main When the RAM is replaced a new User identification UID must be entered before this error can be cleared See Programming the Unit Identification 2These error indexes may also result from corruption of calibration data refer to Restoring Calibration Data earlier in this section interconnections are not listed put should be considered as possible problem sources Report errors by Routine and Error names to your Service Center This table lists the error messages resulting from Enhanced Accuracy Enhanced Accuracy is available after the system has a 20 minute warmup period Table 3 6 Seif Tests Extended Diagnostics Error Index Codes Routine Area Error Index Suspect Hybrid Suspect Board IC FRU FRU s FRU s Probe Gain Ch 1 Cal 1411 Att Atten Gain Ch 1 Cal 1421 Att Gain High Ch 1 Cal 1431 Main Gain Low Ch 1 Cal 1441 Main Balance Ch 1 Cal 1451 Main Coarse DAC Ch 1 Cal 1461 Main Att Offset Ch 1 Cal 1471 Main 11471 Serv
59. e that the amplifier performs properly in any mainframe If neither an 11400 Series mainframe is available then use the Alternative Procedure at the end of this part Measurement Limit Square wave aberrations within 1 and 0 5 peak Setup to Examine Adjust Low Frequency Transient Response Standard Procedure Mainframe Signal Calibration Stand Generator ardizer Coaxial Cable Setup to Examine Adjust Low Frequency Transient Response Standard Procedure Procedure to Examine Adjust Low Frequency Transient Response Standard Procedure C Step 1 Remove the top cover of the mainframe Then Initialize the mainframe s settings and perform the following settings in the order listed Mainframe STORE RECALL major menu Select Delete Waveform label if highlighted then All Waveforms to clear memory Dof WEG BON en aw fees Select Vertical Description pop up menu oo een L left TRIGGER major Menu eee eee ee eee Source Desc Main Trigger Source Description pop up menu L left Malti Size sacs csv reins tia bees here eri aa gees 1 ms div Maint POS ano os viv cs Raed Cea i ne Pea 1 ms Signal standardizer BL EEE ot hed acai Vert or Horiz Step Resp Amplituden re sans a as 8 div POSON es adage hank ree wares ene ars 1 div from top ROD Rate i cians een asien era eae eae 100 Hz Checks and Adjustments Part 5a Low Frequency Transient Response D Standard Procedure Mainframe Store Wavef
60. ection Output 0 4 V Amplitude 250 mV Rise rime lt 125 ps Aberrations lt 1 TEKTRONIX PS 503A Dual Power r Supply with a TM 500 Series Power Module Data Precision 8200 TEKTRONIX 067 0681 01 Tunnel diode Calibration Fixture Checks and Adjustments Table 2 2 Test Equipment cont Description Minimum Examples of Recommended Functional Specification Test Equipment Test Digital Multimeter Accuracy lt 0 01 51 3 Fluke 8842A Digital Multimeter r al witest leads digit 0 01 DC volts and Ree A 0 1 resistance accuracy 4 wire resistance mea surement Signal Standardizer Tektronix Calibration TEKTRONIX 067 0587 02 Signal Fixture with interface Standardizer connector modified for 11000 Series use Calibration Generator Period 0 1 ms TEKTRONIX PG 506 Calibration Amplitude 60 V Generator with a TM 500 Series Square wave output Power Module 0 25 accuracy 1 2 5 amp selection from 200 pV p p to 100 p p 1 ms period fast rise lt ins Calibration Fixture Flexible TEKTRONIX 067 1261 00 Calibration Extender Generator with a TM 500 Series Power Module Coaxial Cable 18 inch 50 Q 18 inch male BNC Tektronix Part 012 0076 00 Fa 2 required connectors Coaxiai Cable 36 inch 50 36 inch male BNC Tektronix Part 012 0482 00 2 required connectors Coaxial Cable 42 inch 50 Q 42 inch male BNC Tektronix Part 012 0057 01 r 2 require
61. electrical specification is checked if Adjust appears in the title the step involves an electrical adjustment If Examine is the first word in the title the step concerns measurement limits that indicate whether the instrument is operating properly these limits are not to be interpreted as electrical specifications initialized Setting At the beginning of most steps you are instructed to initialize the instrument as part of the setup The Initialize feature availabie through the UTILITY menu presets all mainframe controls and functions to known values Initializing the instrument at the beginning of a step eliminates the possibility of settings from previous steps causing erroneous or confusing results For more information on initialization refer to the mainframe User Reference manual Menu Selections and Measurement Techniques Details on measurement techniques and instructions for making menu selections are generally not included in this procedure Comprehensive descriptions of menus and instrument features are located in the mainframe User Reference manual 11A71 Service Reference 2 7 Part i Initial Setup Perform the Checks and Adjustment procedure within the ambient temperature range of 18 and 28 C to ensure proper mainframe and amplifier operation To avoid damage to any of the equipment set the mainframe ON STANDBY switch to STANDBY before installing or removing amplifiers C Step i Install the 11A71Amp
62. en removing and replacing a Hypcon to avoid damaging these contacts Before remounting the Hypcon assembly use a 4X or greater magnifying glass to examine the hybrid elastomer and the Hypcon contacts for dust hair lint or other foreign matter If the A1 Main board surfaces require more cleaning then scrub the surface with a soft rubber eraser and biow on or vacuum the surface while dusting it with a small clean brush If the hybrid and elastomer contact holders are contaminated then flush or spray the holders with alcohol Do not scrub with a cotton tipped swab or similar device since cotton fibers may adhere to the contacts If the contact holder is excessively contaminated then replace the holder Next tighten the mounting screws with two inch pounds of torque 2 3 centimeter kilograms to secure the Hypcon to the board Ensure that the elastomer is properly seated in the contact holder before rernounting the assembly to the A1 Main board That is use care when mounting the assembly to the board to ensure that the proper alignment exists between the connector and A1 Main board Special care must be taken to ensure correct index alignment of each Hypcon part during reassembly since failure to do so can result in a cracked hybrid substrate See Figure 3 3 for indexing information Remove the Hypcon assembly as follows Step 1 Notice the index on the A1 Main board arrow and the plastic frame pointed tab
63. ent in this amplifier This amplifier contains electrical components that are susceptible to damage from static discharge Table 3 1 gives relative susceptibility of various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments Observe the following precautions to avoid damage 1 Minimize handling of static sensitive components 2 Transport and store static sensitive components or assemblies in their original containers on a metal surface or conductive foam Label any package that contains static sensitive assemblies or components 3 Wear a wrist strap while handling these components to discharge the static voltage from your body Servicing static sensitive assemblies or components should be performed only at a static free work station by qualified service personnel The use of the static control mat and wrist strap is recommended 4 Allow nothing capable of generating or holding a static charge on your work station surface Keep the component leads shorted together whenever possible Pick up components by the body never by the leads Do not slide the components over any surface 2 Na Avoid handling components in areas that have a floor or work surface covering capable of generating a static charge 11A71 Service Reference 3 3 Corrective Maintenance Table 3 1 Relative Susceptibility to Damage from Static Discharge Relat
64. es He Ree tie ee ee ee har 2 8 New Configuration Calibration 0 0 00 000 02 cece eee eee 2 9 COMPIBUON era ca ee ieee Bed My eee wer 2 9 Part 2 Enhanced ACCUaACY cause ana anne 2 10 Specifications ia une ne Ra Beh aus hen ann 2 10 Setup to Check Enhanced Accuracy nun eeneeeeenenennene 2 10 Procedure to Check Enhanced Accuracy 2 0 2 0 nennen eer nen 2 10 Part 3 Trigger Balance and Common Mode 0 cece eee ee 2 12 Measurement LIMU esses ated ee Ca teeta sew ace le dha lshera ee an 2 12 Setup to Examine Adjust Trigger Balance and Common Mode 2 12 Procedure to Examine Adjust Trigger Balance and Common Mode 2 12 Part 4 Input Current and Impedance nn 0 0 een 2 14 Measurement Limits 06 cece cece essen senssnen essen en 2 14 Setup to Examine Adjust Input Current and Impedance 2 14 Procedure to Examine Adjust Input Current and Impedance 2 14 Part 5a Low Frequency Transient Response Standard Procedure 2 16 Measurement LIMit aaa en 2 16 Setup to Examine Adjust Low Frequency Transient Response SUNOS POCO aus rer Elke de area ken 2 16 Procedure to Examine Adjust Low Frequency Transient Response Standard Procedure un anna en bene en tha ee 2 16 a Checks and Adjustments cont Part 5b Low Frequency Transient Response Alternate Procedure 2 19 Measurement Limit 200000 e eens 2 19 Setup to Examine Adjust Low Frequency Transient Response Altern
65. fer to Table 2 3 none no Performance Verification or 2 4 for the Procedure bandwidih specifi cations Amplifier Bandwidth none peak peak mea none yes Functional Test Procedure surement gt 848 mV Part 7 Overicad none coupling changes none yes to off Part 8 input Resistance none 5002050 none yes Part 9 Vertical Accuracy yes DC Balance none from 10 mV to1V none trace within 0 2 divs of center Gain none peak peak mea none surement is 5 V 95 mV for the 11300 Series and 5V 65 mV for the 11400 Series Part 10 AC Coupling none bottom of square none yes wave near center graticule line and waveform centered on screen see Fig 2 4 Part 11 DC Balance none Balance within none no 40 2 division Checks and Adjustments Table 2 1 Measurement Limits Specifications Adjustments and Functional Test cont Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Part 12a AV DC Accuracy none within 0 8 none no 11400 Series Mainframe Procedure i UNI Part 12b AV DC Accuracy none within 1 5 none no 11300 Series Mainframe Procedure ESEL Part 13 DC Offset Accuracy none refer to Table 2 5 none no 11A71 Service Reference 2 3 Table 2 2 Test Equipment lists recommended test equipment for use in this manual The Functional Test column of Tabie 2 2 indicates with a check mark the test equipment that is recommended if you are only performing a fu
66. fications When invoked the self calibration activity executes successfully Setup to Check Enhanced Accuracy Maintrame 11A71 CH1 Setup to Check Enhanced Accuracy Procedure to Check Enhanced Accuracy C Step 1 Initialize the mainframe s settings Genter plugi recreen oria e iiad aon ao no setting changes Mainframe este nenne no setting changes C Step 2 Twenty minutes after power on the mainframe must recalibrate itself to achieve the Enhanced Accuracy state Press the ENHANCED ACCURACY button A prompt then appears on the display Press the ENHANCED ACCURACY button again Enhanced Accuracy is achieved after a couple of minutes Turning the mainframe s power off during Enhanced Accuracy testing may result in losing sorne of the non volatile RAM data This could cause diagnostic errors at the next power up and cause the mainframe to operate unpredictably If this event occurs refer to Restoring Calibration Data in your mainframe s Service Reference manual Checks and Adjustments 11A71 Service Reference Part 2 Enhanced Accuracy C Step 3 Check that the message Enhanced Accuracy in Progress indicating that the mainframe is attempting to achieve Enhanced Accuracy appears Step 4 Check that the message Enhanced Accuracy completed and passed or Self calibration completed successfully indicating that the Enhanced Accuracy state has been achieved appears The EA indicator appears on t
67. he display when Enhanced Accuracy is completed Part 3 The Trigger Amplifier is adjusted for balance when the Vertical Amplifier output is Trigger Balance and balanced The Common Com Mode adjustment R812 if installed does not Common Mode need adjustment Measurement Limit Balance 0 0 425 mV Setup to Examine Adjust Trigger Balance and Common Mode Calibration Fixture Flexible Extender Mainframe 11471 Amplifier Digital Multimeter Setup to Examine Adjust Trigger Balance and Common Mode Procedure to Examine Adjust Trigger Balance and Common Mode C Step 1 Perform the following settings in the order listed Mainframe ON STANDBY nass eeanddassababintenie bie d eed be ON Wait for calibration cycle to complete UTILITY major Menu sanken ada wate Initialize Center plug in GH 7 Display Oni ae eek on Digital Multimeter DMM 2 2 222222222200 not connected yet C Step 2 Connect the DMM leads to points K and M See Figure 2 1 for test point locations 2 12 Checks and Adjustments Part 3 Trigger Balance and Common Mode C Step 3 Set the Vert Offset Fine for a DMM readout of 0 mV 5 mV C Step 4 Connect the DMM leads to points D and E Refer to Figure 2 1 for test point locations C Step 5 Examine the DMM for a reading of 0 mv within the limits of 20 mV and 20 mV DO NOT attempt to adjust the TRIGGER BAL if it is within the stated limits Proceed to Step 7
68. ice Reference Diagnostic Troubleshooting Fuse Troubleshooting Failure code 1221 indicates that one or more probe power fuses are defective Refer to Figure 3 1 FRU locator for fuse locations To find a defective fuse remove the amplifier from the mainframe and use a Multimeter to check for continuity across each fuse Replace all defective fuses Then install the amplifier in the mainframe and verify that the diagnostic error does not reappear The most likely cause of a blown fuse is a short circuit applied at the front panel TEKPROBE input connector If a newly installed fuse blows with nothing connected at the TEKPROBE input connector then look for a short circuit on the A1 Main board or on the flexible circuit connecting the Ai Main board to the TEKPROBE input connector Jumpers Two jumpers are installed in the instrument for normal operation Refer to Figure 3 1 and verify that they are properly installed A3J400 A3J410 3 26 Maintenance Theory of Operation Block Diagram Description The Tektronix 11A71 Amplifier is a wide bandwidth amplifier that plugs into any 11000 Series Oscilloscope at accommodates amplifiers This section describes and illustrates refer to Fig 4 1 the amplifier block diagram including signal flow and control flow This section also discusses the power supplies for the amplifier Signal Flow The signal flow begins in the main board and proceeds as described in the fo
69. ier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 1 V div 4 gt 0 575 1000 500 mV div 6 20 863 7 1000 50 mV div 6 0 863 1000 20 mV div 6 20 863 4000 10 mV div 6 gt 0 863 o 500 10 mV div 6 ue gt 0 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes SSS 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Dispiayed Caiculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div cot 5 col 2 500 1 V div 4 gt 0 617 500 500 mV div 6 20 925 500 50 mV div 6 gt 0 925 500 20 mV div 6 20 925 500 10 mV div 6 20 925 a ng eE e 2 24 Checks and Adjustments Part 6 Bandwidth C Step 5 Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 C Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe a 2 3 4 65 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Caiculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 1 Vidiv
70. ier and mainframe combination examined and adjusted in this procedure Measurement Limit The waveform should have a flat top minimum long term spiking and rolloff Setup to Examine Adjust Low Frequency Transient Response Alternate Procedure Mainframe Calibration Generator Fast Rise Output Coaxial Cable Setup to Examine Adjust Low Frequency Transient Response Alternate Procedure Procedure to Examine Adjust Low Frequency Transient Response Alternate Procedure C Step 1 Remove the top cover of the mainframe Then Initialize the mainframe s settings and perform the following settings in the order listed Center plug in Crt Display SIDE a nenne E ee ian on Mainframe HORIZONTAL SIZE u nenn a ders erase e etedien 1 ms div VERTICAL SIZE en punta nun 100 mV div VERTICAL OFFSET nah sen ea nenn nern 400 mV Calibration generator FUNGHON nes E AEAT Fast Rise POO sre huata teh ao eh 10 ms Pulse Amplitude iera euii aa nennen nennen a 8 div C Step 2 Examine the waveform for a flat top 2 19 Part 5b Low Frequency Transient Response Alternate Procedure D DO NOT attempt to adjust the compensation if the waveform already appears to be appropriate Proceed to Step 4 C Step 3 Adjust compensation adjustments R410 and R411 on the A1 Main board for a flat top on the waveform See Figure 2 3 for adjustment locations Step 4 Set the calibration generator Period to 1 ms m C Step
71. ier specifications are more stringent than those in the 71471 User s Reference Supplement Specification AV DC Accuracy within 0 8 Setup to Characterize the 11400 Series Mainframe Calibrator Output Mainframe BNC to Banana Adapter Digital Muitimeter Coaxial Cable Setup to Characterize the 11400 Series Mainframe Procedure to Characterize the 11400 Series Mainframe I Step 1 Perform the following settings Center plug IN 2 58 ann no setting changes Mainframe UTILITY major menu 2 2222 nn scene Extended Diagnostics Subsystem l ou aaan earren Digitizer BIOCK ne en Kent ae aAA Points Acq PU BA ER ER a taa RE RUSSEN Cal Refs ROUNE en en ee un FP 10 000 V RUN an een en ea were Deren te Al Digital multimeter DMM Mode ne ee aa een een ee en Bate DC Hange a 4a nen a Zu ea ran ee Auto 11A71 Service Reference 2 33 Part 12a AV DC Accuracy 11400 Series Mainframe Procedure C Step 2 Record the DMM absolute value Step 3 Press Exit Step 4 Press FP 9 9951 V Step 5 Press Run Step 6 Record the DMM reading Step 7 Press Exit Step 8 Press Exit Diagnostics DOoOo Do on Step 9 Add the DMM absolute values of the readings obtained in Steps 2 and 6 Divide the result by 19 9951 V to obtain the mainframe s calibration voltage reference characterization factor which is used in the Procedure to Check the Amplifier AV DC Accuracy Setup to Check the Amplifier
72. ive Semiconductor Classes Susceptibility Levels MOS or CMOS microcircuits and discrete or linear 1 microcircuits with MOS inputs most sensitive ECL 2 Schottky signal diodes 3 Schottky TTL 4 High frequency bipolar transistors 5 JFETS 6 Linear microcircuits 7 Low power Schottky TTL 8 TTL least sensitive 9 Voltage equivalent for levels 1 100 to 500 V 600 to 800 V 2 200 to 500 V 7 400 to 1000 V est 3 250V 8 900 V 4 500 V 8 1200 V The voltage equivalent is the voltage discharged from a 100 pF capacitor through a resistance of 100 Removing and Replacing FRUs To avoid instrument damage set the mainframe ON STANDBY switch to STANDBY and remove the amplifier from the mainframe before removing or replacing FRUs See Figure 3 1 to determine the location of an FRU The exploded view drawing in Section 5 Replaceable Parts may also be useful in the removal replacement procedures that follow Note that the side shields will have to be removed to gain access to most of the parts listed in the removal replacement procedures that follow if the green light indicator remains lit when the STANDBY position is selected then the switch has been left internally disabled after servicing the power supply To enable the ON STANDBY switch refer to the Maintenance section of the mainframe Service Manual 3 4 Maintenance Corrective Maintenance A1F110 A1F100 AF111 A1F112 Fuse Fuse Fuse Fuse
73. iy one orientation When the back of the hybrid rests on the heat sink pedestal the top of the hybrid should be flush with the top of the At Main board C Step 5 Place the plastic frame with the elastomer installed over the hybrid so that the key pointed tab aligns with the comer arrow on the board C Step 6 Replace the four Torx head screw washer assemblies and apply two inch pounds of torque 2 3 cm kg to secure the connector assembly Do not overtighten the assembly since over tightening the assembly will strip the microcircuit stiffener heat sink mounting threads 11A71 Service Reference 3 9 Corrective Maintenance Exploded View of Hypcon Connector Screw Washer Assemblies 4 Plastic Frame oN Registration Pins Elastomer Contact Holder x Index PC Board Microcircuit Stiffner Heat Sink Cross Section View of Hypcon Connector Contact Elastomer Contact Holder Conductor TN Conductor Figure 3 3 Hypcon Assembly Removal and Replacement 3 10 Maintenance Corrective Maintenance DIP IC Dual In line Package Integrated Circuit if the RAM IC is soldered into the board then consuit a Tektronix service center for recommended removal procedures Do not solder in the replacement IC Instead install a 24 pin socket and plug the RAM IC into the socket Remove the DIP IC as follows C Step 1 Use Insertion Extraction Pliers such as General Tool s
74. lay amplitude centered on the screen Step 4 Set the leveled sine wave generator frequency to each Test Frequency in column 1 of Table 2 3 or Table 2 4 and record the Displayed Amplitude in column 2 on a copy of Table 2 3 or Table 2 4 This data is used in the Procedure to Check Amplifer Bandwidth for calculating the amplifier bandwidth Step 5 Set the mainframe ON STANDBY switch to STANDBY Step 6 Remove the signal standardizer from the Center plug in compartment Remove the amplifier from the Left plug in compartment and reinstall it in the Center plug in compartment Checks and Adjustments Part 6 Bandwidth Setup to Check Amplifier Bandwidth Performance Verification Procedure Mainframe Leveled Sine Wave Generator in fn 2 70x Attenuators Coaxial Cable not connected yet Setup to Check Amplifier Bandwidth Performance Verification Procedure Procedure to Check Amplifier Bandwidth Performance Verification Procedure C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Center plug in CHI Display On Off na tesa una on Mainframe Main Size or HORIZONTAL SIZE 22220222000 10 us div IMPedance icone cas coe sab kenn bay Leo aawae dave 500 Leveled sine wave generator i Amplitude re see lan era O e heilen 4Vp p FISQUENCY na Rear co Giant erecta eat Ref if the leveled sine wave generator has a remote leveling head then you m
75. le 2 1 Measurement Limits Specifications Adjustments and Functional Test Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Part 1 Initial Setup none none none yes Part 2 Enhanced none successful yes Accuracy execution Part 3 Trigger Balance and Balance 0 0 none R813 TRIGGER no Common Made 20 mV BAL to 0 0 20 mV Part 4 Input Current and im Innput resistance none R521 INPUT for no pedance 50419 0 0 mV R511 ZIN Open circuit input for 50 02 voltage 0 42 0 mv Part 5a Low Frequency Square wave aber none R410 and R411 for no Transient Response Standard Procedure rations with 1 and 0 5 peak a flat top on the dim waveform R311 and R312 for optimum square wave flat top R310 R510 and C412 for optimum square wave flat top 11A71 Service Reference 2 1 Table 2 1 Measurement Limits Specifications Adjustments and Functional Test cont Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Part 5b Low Frequency waveform with flat none R410 and R411 for no Transient Response top minimum lor g a flat top on the Alternate Procedure term spiking and dim waveform rolloff R311 and R312 for optimum square wave flat top R310 R510 and C412 for optimum square wave flat top Part 6 Bandwidth Amplifier Bandwidth none re
76. lifier to be inspected in the mainframe s Center plug in compartment then set the front panel ON STANDBY switch to ON Turning the mainframe power off during probe calibration self calibration Extended Diagnostics or other intense system activity may result in some internal data being corrupted If corruption occurs refer to Restoring Calibration Data in Section 3 C Step 2 Power on the following test equipment so that it is warmed up with the mainframe and amplifier to be tested Power supply Calibration generator Leveled sine wave generators Digital multimeter C Step 3 With the ON STANDBY switch set to STANDBY connect the mainframe to a suitable power source C Step 4 Set the front panel ON STANDBY switch to ON C Step 5 Allow the equipment to warm up for 20 minutes before continuing Procedure Each time the front panel ON STANDBY switch is set to ON the mainfrarne performs comprehensive diagnostics on all of its major circuits Diagnostics As the Diagnostics progress relays will click and the screen will at times display various patterns Successful completion of diagnostics is indicated by return to normal operation or entry into the new configuration calibration state as discussed below Any failures cause the mainframe to either display the diagnostics menu which indicates the failed test or lockup and light a combination of the major menu button labels If a diagnostics failure occurs refer the m
77. llowing paragraphs Main Board The signal display begins with the application of a signal directly to the CH 1 input connector on the Main board possibly with a probe and proceeds as follows Delay Line CH 1 input f Hi Input gt Vertical connector Attenuator Amplifier Amplifier The input coupling mode is either AC DC or Off In the AC and DC coupling modes the input signal is coupied to the Attenuator In the Off coupling mode the signal path is open During seif calibration the mainframe supplies the signal to the CH 1 input connector and the coupling mode is set to Off The CH 1 Attenuator contains resistive dividers an ac coupling capacitor and relays The Attenuator has 2X 5X and 10X attenuation sections which are connected to produce 2X 5X 10X 20X 50X or 100X attenuation The Fast Protection circuit protects the Input Amplifier from fast rise high amplitude input signals that could cause damage to the Input Amplifier Kernel Board to Main Board The Kernel board contains a microprocessor MPU that communicates with the mainframe The MPU constantly monitors the input Overload Sense and the Probe Data communication lines The MPU operates through the internally stored program in its read only memory ROM The MPU stores the amplifier calibration cal constants in random access memory RAM A battery backs up random access memory RAM memory therefore the internal calibration constants are not lost upon po
78. me use Vertical Cursors to help measure and set the trace position if you are using the 11400 Series mainframe set Average N to On and use Mean whole zone in the MEASURE major menu to help measure and set the trace position Step 3 Connect the BNC T Connector to the CH 1 input connector with the DMM connected Step 4 Set the Vert Offset or VERTICAL OFFSET to 4 V Set the power supply voltage so that the displayed trace returns to the position noted in Step 2 Divide the DMM reading by the mainframe characterization factor obtained in the Procedure to Characterize the Mainframe and subtract the Vertical Offset C Step 5 Check that the result obtained in Step 4 is less than the Error Limit shown in Table 2 5 C Step 6 Disconnect the BNC T connector at the CH 1 input connector and set Vert Offset or VERTICAL OFFSET to 0 Step 7 Repeat Steps 2 through 6 for each Vertical Size and Offset shown in Table 2 5 When testing with small voltages it may help to install attenuators in series between the BNC to alligator clip adapter and the coaxial cable so that you can set the voltages with better resolution You can also use a DC voltage calibrator to achieve better resolution when testing with small voltages 2 44 Checks and Adjustments Part 13 DC Offset Accuracy Table 2 5 11A71 Amplifier DC Offset Accuracy Vertical Size Verticai Offset Error Limit Volts 1 Vidiv av 26 0 mV 500
79. mes Sree N a 1 B 4 9 6 Mainframe with oe Amplifier Standardizer Mainframe with Amplifier only a al Test Displayed Vertical Referenc Displayed Calculated Frequency Amplitude 5 Size Amplitude Amplitude Amplitude MHz div i div div col 5 col 2 500 gt 0 617 500 we ee ____ 0 925 500 Be a ____ 0 925 500 _ N _ 20 925 500 a 20 925 PERF LG 224 Checks and Adjustments Part 6 Bandwidth Step 5 Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 C Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe 0 2 3 4 6 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 1000 LOS PEF 1 v div 4 SAS epee 20 575 1000 2O0UV PEE S00 mV div 6 242 gah 20863 1000 coe tee 50 mV div 6 at 7 gt 0 863 1000 20 mV div 6 gt 0 863 1000 10 mV div 8 gt 20 863 C 500 gohi 10 mV div 6 F3 0 925 Table 2 4 11A71 Amplifier Bandwidth in the 11401 or 11300 Series Mainframes n 2 3 4 5 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed
80. mplifier Memory Backup Power The non volatile RAM A1U801 NV RAM within the amplifier allows retention of the data in memory when the mainframe power is removed NV RAM stores system configuration data such as the amplifier mainframe and probe IDs as well as the calibration constants The data that the NV RAM stores enable the amplifier to resume Enhanced Accuracy performance from a powered down condition without performing a full calibration Enhanced Accuracy operation The rated lifetime of the NV RAM s integral power source is ten years If on system power up the amplifier habitually loses Enhanced Accuracy status without a system configuration change that is the amplifier remains plugged into the same slot in the same mainframe then the NV RAM might require replacement Field Replaceable Unit FRU Guide This section correlates error index codes resulting from Diagnostic tests with the hybrid integrated circuit IC module or board FRU s suspected of causing each error The FRU s in each category are listed in most to least probable cause order assuming only one error is indicated If any diagnostic errors occur inspect the suspect FRU for loose connections and components Repeat the Diagnostic test If any diagnostic errors occur again replace the suspect FRU s with a known good FRU s Verify that the new FRU is a correct replacement for the old FRU If the old FRU contains firmware then verify that the new firmwa
81. nctional test Procedure steps are based on the test equipment examples given but other equipment with similar specifications may be substituted Test results setup information and related connectors and adapters may be altered if you use different equipment Table 2 2 Test Equipment Description Minimum Examples of Recommended Functional Specification Test Equipment Test 11000 Series Tektronix mainframe that TEKTRONIX v Oscilloscope mainframe that accommodates amplifiers Power Medule Leveled Sine Wave Generators accommodates amplifiers 11301 Programmable Oscilloscope 11302 Programmable Oscilloscope 11301A Counter Timer Oscilloscope 11302A Counter Timer Oscilloscope 11401 Digitizing Oscilloscope 11402 Digitizing Oscilloscope 11403 Digitizing Oscilloscope Note The Amplifier Mainframe combination will determine system bandwidth Tektronix four compart ment power module TEKTRONIX TM 504 Power Module 250 MHz to 1000 MHz Leveled variable amplitude 50 kHz or 6 MHz reference TEKTRONIX SG 504 Leveled Sine vr Wave Generator with a TM 500 Series Power Module 260 kHz to 250 MHz Leveled variable amplitude 50 kHz or 6 MHz reference Power Supply DC Voltage Calibrator optional Pulser TEKTRONIX SG 503 Leveled Sine Wave Generator with a TM 500 Series Power Module Continuously variable from 0 40 V current limit adjustable from 0 400 mA 20 V at 400 mA with overcurrent prot
82. o corner contacts could result C Step 2 Arrange the other IC corners with the tweezers to fit evenly at the edges of the socket C Step 3 Set the cover flat on the IC with its end tabs properly aligned with the mating recesses in the socket The cover is not symmetrical C Step 4 Push the cover down keeping it flat on the IC and slide into place Hold the cover in place while maving the retaining clip over the tabs on the other end 3 6 Maintenance Corrective Maintenance Cover End Tabs Index Bevei u N Ic m Retaining Clip Index Spring 68 Pin Slam Pack IC Mating Recesses Sa SER SS Sein DEREN AH Housekeeper IC re a Fe Pin Number Sequence Path Highest Pin Number 1 index 1 f index Index index Index Index index ln er en ee eo Dual In Line Package IC ne 11A71 Service Reference Figure 3 2 Semiconductor indexing Diagram Amplifier Hybrids Figure 3 3 shows an exploded view of the Hypcon Hybrid printed circuit connector and gives disassembly and replacement instructions When replacing the hybrid do not touch the elastomer s gold plated contacts with your fingers Use a cleaner which will not lessen contact reliability The Hypcon socket contacts are fragile Use caution when removing and replacing a Hypcon to avoid damaging these contacts Before reinstallation use a 4X or greater magnifying glass to examine the hybrid elastomer and the Hypcon contacts un
83. on occuring appears If the calibration is successful as indicated by a message the instrument enters the normal operating mode Restoring Calibration Data if the instrument power is turned off during probe calibration self calibration Extended Diagnostics or other intense system activity then some internal data may be corrupted The display of the Extended Diagnostic menu when the power is turned on indicates that this corruption has occurred If the Extended Diagnostics menu displays a Cksm Probe error this error indicates that the power was turned off during probe calibration then using the following procedure usually restores normal operation 1 Note from the Extended Diagnostics menu which arnplifier is at fault Exit the Extended Diagnostics menu Remove and re install the probes on the amplifier that is at fault 2 N Repeat the calibration of these probes 5 Run the Self Tests and confirm that the tests pass if the Extended Diagnostics menu displays a Cksm Plug or any other new error then using the following procedure usually restores normal operation 1 Exit the Extended Diagnostic menu 2 Wait for the self calibration to complete and pass 3 Run the Self Tests and confirm that the tests pass Maintenance Diagnostic Troubleshooting Usually these procedure restore normal operation If these procedures do not restore normal operation then your mainframe or amplifier requires servicing A
84. orm 2 0 00 0 0 66 ce cece cee eee Wim 1 Signal standardizer ROD AMG a ren cae ADETE EAEN 1 kHz Mainframe Malt Sib leere 100 us div Store Waveform 0 00 0 nce eee Wtm 1 Signal standardizer Rep HAG itis aa ee ra Shas tank deca Tae ene 10 kHz Mainframe Maint Se 4 saves ee een er 10 s div Store Waveform 0 6 c ccc cece eee eee ee eee Wim 1 Remove Wim sessar ccc cece eee ne cee eee L left Center plug in CHT ISOS FOND vertan on Mainframe Vart Size ne ee ees Se sae eee ewes 100 mV div Vert OSet ae ea 400 mV Calibration Generator PUNCH ON ys ee Gf iets ews aba fe Fast Rise FIIR eu ETIT 10 ms Pulse Amplitude nn en epee EEr ee ae 8 div Mainframe Man SiZ 2 222 2 lc ar oh ad wae eh See 1 ms div Recall Waveform 2 00 Stored 1 C Step 2 Examine the dim waveform as compared to the bright waveform for a fiat top within the limits of 1 peak and 0 5 peak DO NOT atternpt to adjust the compensation if it is within the stated limits Proceed to Step 4 C Step 3 Adjust compensation adjustments R410 and R411 on the A1 Main board for a flat top on the dim waveform as compared to the bright waveform See Figure 2 3 for adjustment locations C Step 4 Set the calibration generator Period to 1 ms C Step 5 Remove Wfm Stored 1 C Step 6 Set Main Size to 100 us div C Step 7 Recall Waveform Stored 2 _ Step 8 Examine the waveform for minimum long term spiking and rolloff flat top within
85. ottom frames Step 11 Use a Torx T 10 screwdriver to install the six screws and nut blocks that clamp the A1 Main board to the top and bottom frames Step 12 Plug the probe information connector into its socket on the A1 Main board Step 13 If you installed a new board without an attenuator install one as outlined on page 3 13 Step 14 Install the A3 Kernel board Step 15 If the A1 Main board has been replaced then the Unit Identification UID number needs to be re entered Refer to Programming the Unit Identification later in this section 11A71 Service Reference 3 15 Corrective Maintenance w Top of Plug in Frame Section Circuit Board Figure 3 6 Location of a Nut Block Securing the Circuit Board to the Frame Section Nut Blocks 3 Figure 3 7 Locations of the Nut Blocks for Removal of the AT Main Board Programming The Unit Identification The Unit Identification UID is identical to the instrument s serial number and is stored in NV RAM It is necessary to enter this number if the A1 Main board is replaced or if data in NV RAM becomes corrupted If confirmation only of the UID is needed then use the following procedure except skip Step 4 To enter the UID use this procedure C Step Connect a Terminal to the mainframe s RS 232 C port Refer to the mainframe User s Reference Manual for instructions on setting up the RS 232 C parameters C Step 2 Lo
86. ows m o O o Step 1 Unhook the return spring from the release bar and set it aside Step 2 Use a Torx T 8 screwdriver to remove the four screws that fasten the front subpanel to the top and bottom frames Step 3 Pull the release bar as far out of the instrument as it will come and leave it in that position Step 4 Insert a slender sharp pointed tool such as a scribe between the front panel and the subpanel at the notch around the release bar Gently separate the front panel from the subpanel Use care to prevent bending the front panel Install the Front Panel as follows 0 E CELL q OO m 0O Step 1 Check that the four screws that fasten the front subpanel to the top and bottom frames are removed Step 2 Check that the release bar return spring is removed Step 3 Set the amplifier on its side with the front panel facing you Step 4 Pull the release bar as far out of the instrument as it will come and leave it in that position Step 5 Position the front panel so that the notch in the bottom fits over the release bar then carefully insert the four front panei tabs into the slots in the front subpanel You may need to pull the top and bottom frames away from the subpanel to allow the front panel tabs to fit between the casting and the frames Step 6 Gently snap the edges of the front panel into piace around the input connectors and the outer edges of the panel Step 7 Use a Torx T 8
87. properly wired receptacle before connecting the mainframe to the input or output terminais of the amplifier A protective ground connection by way of the grounding conductor in the mainframe power cord is essential for safe operation 1 2 General Information Plug in to Mainframe Compatibility Danger Arising from Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating can render an electric shock Do Not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an atmosphere of explosive gasses Do Not Service Alone Do not perform intemal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing with Power On Dangerous voltages exist at several points in this product To avoid personal injury do not touch exposed connections and components while the power is on Disconnect the power before removing protective panels or replacing components The system bandwidth depends on the mainframe Details about bandwidth are included in Part 4 Specification of the 17A77 User s Reference Supplement and in the Tektronix Corporate Catalog Refer to the Tektronix Corporate Catalog for complete compatibility information 11A71 Service Reference 1 3 Installing and Removing the Piug in Top Groove
88. re version is either the same version as or an upgraded version of the old firmware version Abbreviations of FRU Names All boards are listed here with the abbreviation used in the FRU tables below Table 3 2 Board FRU Abbreviation Name Designator Main Main board Al Front Front Panel board A2 Kernel Kernel board A3 11A71 Service Reference 3 23 Diagnostic Troubleshooting Abbreviations of Component and Module Names All active components and modules are listed here with the abbreviation used in the FRU tables below Table 3 3 Component Module FRUs Abbreviation Name Designator MPU Processor A3U500 EPROM Firmware A3U800 RAM Memory A3U700 HK Housekeeper A3U820 Att Attenuator FUSE Probe power fuses A1F100 A1F110 AiFii1 AIF112 Error Index Codes This table lists the error codes possible in the Kernel Tests Table 3 4 Amplifier Kernel Error Index Codes Error Code Suspect Module Suspect Board Hybrid or IC FRU s FRU s 1 RAM Kernel 2 HK MPU Kernel When the RAM is replaced a new User Identification UID must be entered before this error can be cleared See Programming the Unit Identification Maintenance Diagnostic Troubleshooting This table lists the error messages possible in the Seif Tests and Extended Diagnostics Table 3 5 Self Tests Extended Diagnostics Error Index Codes Routin
89. re to keep it straight unplug the Attenuator from the A1 Main board Avoid disengaging one end of the Attenuator before disengaging the other end Do not apply force to any subcomponents on the Attenuator nstail the Attenuator as follows Step 1 Set the amplifier on its side with the pushbutton down Step 2 Align the Attenuator pins with the connector on the Ai Main board and align the Attenuator frame with the holes in the A1 Main board Step 3 Plug the Attenuator into its connector on the Ai Main board Do not apply force to any subcomponents on the Attenuator Step 4 Use a Torx T 10 screwdriver to install the two screws that fasten the Attenuator to the Ai Main board Step 5 Plug the coaxial connectors into the input and output of the Attenuator refer to Fig 3 5 Care is necessary when engaging these connectors For best results proceed as follows Check that the center conductor is straight Straighten if necessary x Plug the connector straight into the receptacle Look through the slot in the outer receptacle and watch the center conductor enter its receptacie as you insert the connector Step 6 Replace the A3 Kernel board 11A71 Service Reference 3 13 Corrective Maintenance Screws 2 Located between the AT Main Board and the A3 Kernel Board on the Reverse Side of the AT Main Board Output Coaxial Cable A3 Kernel Board Attenuator input Cable
90. s for troubleshooting is to use the error index code output from the Diagnostics or Seif Tests and cross reference them to the suspect FRU s in the FRU Guide tables After an FRU is replaced some recalibration of the instrument is normally required this is discussed further below Diagnostics Overview The processor runs a set of Kernel Tests prior to the Self Tests If this is successful then the Self Tests run to verify the functionality of each of the subsystems Any failure causes the instrument to enter Extended Diagnostics and to display the error index code s in a diagnostic menu Extended Diagnostics tests are a superset of the Seif Tests The Kernel Tests Self Tests Extended Diagnostics and the Enhanced Accuracy mode produce and format error index codes differently so they are covered separately Some of these tests that may indicate faulty FRUs are not run automatically during the Self Tests that is some errors codes are only generated by manually selecting tests The next two subsections provide a quick overview of Kernel Tests and Extended Diagnostics Kernel Diagnostics Each time the front panel ON STANDBY switch is set to ON the mainframe and amplifiers perform Kernel Tests on their microprocessor subsystems and Self Test Diagnostics on all of their major circuits Turning the instrument power off during the execution of the 3 Diagnostic tests may result in losing some or all of the non volatile RAM data such
91. screwdriver to install the four screws that fasten the front subpanei to the top and bottom frames Step 8 Install the release bar return spring Orient the spring so that its loop fits over the frame hook correctly flat against the frame section Remove and Install an A2 Front Panel Board as follows Step 1 Remove the front panel Step 2 Unplug the connector that provides electrical connection to the A3 Kernel board Step 3 Use a Torx T 6 screwdriver to remove the two screws that fasten the A2 Front Panel board to the front subpanel and remove the A2 Front Panel board Step 4 To replace an A2 Front Panel board follow the preceding steps in reverse order Maintenance Corrective Maintenance Remove and Install the A3 Kernel Board as follows 00 0 0 Eee m o Step 1 Unplug the A2 Front Panel board connector from the A3 Kernel board Step 2 Remove the two gray A1 Main board connectors from the A3 Kernel board Step 3 Use a Torx T 10 screwdriver to remove the four screws that fasten the A3 Kernel board to the A1 Main board Step 4 To install follow the preceding steps in reverse order Remove the Attenuator as follows Step 1 Remove the A3 Kemel board Step 2 Unplug the coaxial connectors from the input and output of the Attenuator Step 3 Use a Torx T 10 screwdriver to remove the two screws that fasten the Attenuator to the A1 Main board refer to Fig 3 5 Step 4 Using ca
92. served Tektronix products are covered by U S and foreign patents issued and pending The following are registered trademarks TEKTRONIX TEK TEKPROBE SCOPEMOBILE and m Second Edition JUN 1989 Printed in U S A Contents 11A71 Service Reference General information Safety SUMMA iis een ehren een 1 2 Terms in Manuals u sca Heer eat 1 2 Toms n EQUIPMENT u a Bs a ein 1 2 Symbols in Manuals ssssesresroroersseomivesesssesisea 1 2 Symbols on Equipment 0 0 0 6 eee eterna 1 2 POWE SOUPS iii foie sowie O Motos kon wounds Hee Mee nee 1 2 Grounding the Product 60 eea cece eee e cere eee eet ee ence nee 1 2 Danger Arising from Loss of Ground 0 ccc eee 1 3 Do Not Operate in Explosive Atmospheres 000 ee 1 3 Do Not Service Alone 0 eee nen 1 3 Use Care When Servicing with Power On 2 0 0 0 cece eee 1 3 Plug in to Mainframe Compatibility 0 02 00 cee eee ee 1 3 Installing and Removing the Plug in 0 00 00 cece te eee 1 4 Instrument Options 22 0 ee Sew ew OOK 4 1 5 Packaging for SHIHMENE sure a aan 1 5 Operating ENVONM n os neci aaea aea area 1 5 Checks and Adjustments Using These Procedures 0 0 ce eee ee eee eee ee eeee 2 7 Conventions in this Manual 02 eee cee eee 2 7 initalzed Seting a area CAE RE eRe 2 7 Menu Selections and Measurement Techniques 0 2 7 Pat Uintah SR nee are ee 2 8 PORSIB ee an nee ee a 2 8 Dlagfi sties iur Ar
93. ship amplifiers and mainframes separately Attach a tag to the amplifier if it is shipped to a Tektronix service center for service or repair Include the following information on the tag Name and address of the amplifier owner Name of a person at your firm who can be contacted about the amplifier Complete amplifier type and serial number x A description of the service required Package the amplifier as follows if the original package is not available or is not reusable 1 Obtain a corrugated cardboard carton with inside dimensions at least six inches 15 crn greater than the amplifier dimensions Use a carton with a bursting test strength of at least 200 pounds per square inch 2 Fully wrap the amplifier with anti static sheeting or its equivalent to protect the finish 3 Tightly pack dunnage or urethane foam between the carton and the amplifier to cushion the amplifier on all sides Allow three inches of packing on each side 4 Seal the carton with shipping tape or with industrial staples 5 Mark the address of the Tektronix service center and your return address on the carton in one or more prominent places The following environmental requirements are provided so that you can ensure proper functioning and extend the operation of the amplifier Operate the amplifier in a mainframe where the ambient air temperature is between 0 and 50 C Store the amplifier in ambient temperatures from 40 to 75
94. specifications for this part are as follows Bottom of square wave is near the center graticule line x The waveform is vertically centered on the screen see Fig 2 4 Setup to Check AC Coupling Mainframe Calibration Generator 42 inch Coaxial Cable Setup to Check AC Coupling Procedure to Check AC Coupling C Step 1 First Initialize the mainframe s settings then perform the following settings in the order listed Amplifier CH t Display On off ga ke ea on Calibration generator MOGE nase Padawan eds Lae Std Amp ANGE u a ee 5V Mainframe Vert Size or VERTICAL SIZE oe eee 500 mV div Main Size or HORIZONTAL SIZE 2 0 eee 100 us div C Step 2 Check that the bottom of the square wave is near the center graticule line C Step 3 Select AC Coupling for the CH 1 input C Step 4 Check that the waveform is vertically centered on the screen and that it resembies the waveform shown in Figure 2 4 2 30 Checks and Adjustments Part 10 AC Coupiing Figure 2 4 Waveform with AC Coupling Selected 11A71 Service Reference 2 37 Part 11 DC Balance The position of the displayed trace with no input signal applied is exarnined The purpose of this procedure is to confirm that DC balance can be accomplished accurately This procedure does not test for drift over time or temperature Therefore the specifications are more stringent than the _ specifications in the 11471 User s
95. the limits of 1 peak and 0 5 peak DO NOT attempt to adjust the compensation if it is within the stated limits Proceed to Step 10 11A71 Service Reference Part 5a Low Frequency Transient Response Standard Procedure C Step 9 Adjust compensation adjustment R311 and R312 on the A1 Main board for optimum square wave flat top See Figure 2 3 for adjustment locations C Step 10 Set the calibration generator Period to 0 1 ms C Step 11 Remove Wim Stored 2 C Step 12 Set the Main Size to 10 us div Step 13 Recall Waveform Stored 3 C Step 14 Examine the waveform for minimum long term spiking and rolloff flat top within 1 peak and 0 5 peak DO NOT attempt to adjust the compensation if it is within the stated limits Proceed to Step 16 C Step 15 Adjust compensation adjustment R310 R510 and C412 on the A1 Main board for optimum square wave flat top See Figure 2 3 for adjustment locations C Step 16 Reinstall the top cover of the mainframe R310 R312 c412 R411 R311 R410 R510 Figure 2 3 A1 Main Board Low Frequency Response Adjustment Locations 2 18 Checks and Adjustments Part 5b Low Frequency Transient Response Alternate Procedure 11A71 Service Reference Compensation networks are adjusted to optimize the transient response This procedure is used when an 11400 Series mainframe is not available Performance is assured only for the particular amplif
96. ts as an insulating blanket and prevents efficient heat dissipation which can cause overheating and component breakdown Dirt also provides an electrical conduction path that can result in amplifier failure The cabinet panels of the mainframe in which the amplifier is installed reduce the amount of dust reaching the interior of the amplifier Keep the cabinet panels in place for safety and cooling Avoid the use of chemical cleaning agents which might damage the materials used in this amplifier Use only Isopropyl alcohol or totally denatured ethyl alcohol Before using any other type of cleaner consult your Tektronix service center or representative Exterior dust accumulated on the outside of the amplifier can be removed with a soft cloth or small brush The brush is particularly useful for dislodging dirt in and around the side shield ventilation holes and front panel switches Remove the side shields before cleaning them 11471 Service Reference Preventive Maintenance CAUTION f interior cleaning the interior of the amplifier should seldom be necessary The best way to clean the interior is to blow off the accumulated dust with dry low velocity air such as from a vacuum cleaner Remove any dirt that remains with a soft brush or a cloth dampened with a mild solution of detergent and water A cotton tipped swab is useful for cleaning in narrow spaces or for cleaning more delicate circuit components refer to the
97. ure analysis uses If the result ing signature of the Housekeeper IC does not match a known good signature then the test fails and reports a fault code of 3 Also the test is executed re peatedly if it fails The instrument continues looping the Housekeeper IC Test until power is removed Until the condition causing the Housekeeper IC Test to fail is corrected the mainframe does not recognize the amplifier After all power on Kernel Tests have completed and successfully passed the amplifier initializes its settings and communicates with the mainframe 3 20 Maintenance 11A71 Service Reference Diagnostic Troubleshooting Self Test Extended Diagnostics First the amplifier must successfully power up initialize its settings and establish communication with the mainframe Then the mainframe requests that the amplifier execute its Self Test routines unless the mainframe s Self Tests are disabled in which case all the Self Tests are ignored Return to normal operation or entry into the New Configuration calibration as discussed below indicates successful completion of Self Test Diagnostics Any failures cause the instrument to display the Extended Diagnostics menu Record the displayed error codes for the failed circuit block s You may have to step through several pages of the menu display to find all the failure codes The format of the error index codes is based on the Extended Diagnostics menu structure The Extended
98. ust connect it to the amplifier input connector without additional coaxial cables The reference frequency must be between 50 kHz and 6 MHz Perform this procedure for each Vertical Size listed in column 3 of Table 2 3 or Table 2 4 if the leveled sine wave generator is not equipped with internal attenuators then use the 10X attenuators at the amplifier input when setting amplitude To measure the amplitude either count the divisions or use the AV cursors Step 2 Set the leveled sine wave generator amplitude as shown in the Reference Amplitude column 4 C Step 3 Set the leveled sine wave generator frequency as shown in the Frequency column 1 C Step 4 Record the Displayed Amplitude in column 5 11A71 Service Reference Part 6 Bandwidth C Step 5 Check that the amplifier amplitude computed by dividing column 5 by column 2 is at least the value shown in column 6 C Step 6 Set the leveled sine wave generator to the reference frequency Table 2 3 11A71 Amplifier Bandwidth in the 11402 or 11403 Mainframe a 2 3 a 6 6 Mainframe with Amplifier Standardizer Mainframe with Amplifier only Test Displayed Vertical Reference Displayed Calculated Frequency Amplitude Size Amplitude Amplitude Amplitude MHz div div div col 5 col 2 Nt Sse 1000 N 1 V div 4 20 575 1000 500 mV div 6 gt 0 863 1000 50 mV div 6 gt 0 863 1000 20 mV div 6 _ 220 863 1000 10 m
99. wer down Aliso when powering down the mainframe stores the oscilloscope s settings When the system re powers the mainframe restores and transmits these settings to the amplifier 11A71 Service Reference 42 Calibration Reference Voltage Trigger Amplifier ATUS1O Vertical Amplifier Fast Input Attenuator Protection Amplifier ATU630 A1U830 A1U930 Offset Overload Sense Probe Data AT Main Board On Off Control EPROM A3U800 NV RAM A3U700 A2 MPU Data Front panel Board A3U500 Data Housekeeper A3U820 Channel Switch Sequence Serial Data A3 Kernel Board Figure 4 1 11A71 Amplifier Block Diagram Trigger Signal Display Signal Main frame AID DIA Conversion Theory of Operation The MPU communicates with the mainframe through a peripheral IC called the Housekeeper The Housekeeper converts the 8 bit data bytes from the MPU into a serial data signal This signal is sent to the mainframe Conversely the Housekeeper converts the serial data signal from the mainframe into 8 bit data bytes for the MPU to read The MPU stores the channel switching sequence in the Housekeeper The Housekeeper also updates the analog contro voltages The MPU uses an analog to digital A D converter to read the value of the Overload Sense and Probe Data lines The A D converter is also used in the Self Tests The MPU reads the front
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