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AFG2021 Arbitrary Function Generator Service Manual

1. 5 Tektronix service offerings eme meses ere sr ee een 6 Performance verification procedures 2 2 22 6 Operating Lis MM 7 S NIDDCIBEZIDIC 7 IG rb 8 Power the instrument on and off csse eme mee esses 9 Perform instrument self test and 1 0 00 00 00 10 Protect your instrument from 2 eese enn 11 Floating ground crpi 13 Protect your 14 Front panel BEN aT VIR ke d 15 Parts of the screen interface asc erede stone SE e e eun eate Du Te IRE Fe c ou 16 Cau p EAN 17 19 OVERVIEW 19 Main board P Tc nats 20 Front Panel board 21 Power Supply module SERERE FEES 21 BNC Insulator boards n 21 Adjustment procedures ooo URN SEE iden teu 23 Purpose
2. 8 58 Figure 28 Installing the rear BNC washers nuts and insulators 2 2 59 Figure 29 Troubleshooting tree II s me me he sse nee ee ener 62 Figure 30 Interconnections for the 2021 200 2 67 Figure 31 Front panel assembly exploded 2 000 00 72 Figure 32 Chassis assembly exploded diagram 100 20004 75 AFG2021 Service Manual lii Table of Contents List of Tables iv Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Test EMT 24 External inspection check 66 me mene een 33 Internal inspection check eme meme mene eee 35 Troubleshooting 2 61 Error nm 65 Parts list column descriptions een 70 Front panel assembly replaceable parts See Figure 31 0 00202 71 Chassis assembly replaceable parts See Figure 32 2 2 73 AFG2021 Service Manual General safety summary General safety summary To avoid fire or personal injury AFG2021 Service Manual Review the following safety precautions to avoid injury and
3. Messtechnik GmbH Weidenweg 21 58239 Schwerte Tel 02304 96109 0 Fax 02304 96109 88 Mss E Mail info pewa de Elektronik Homepage www pewa de AFG2021 Arbitrary Function Generator Service Manual Tektronix 077 0586 00 S 2021 Arbitrary Function Generator Service Manual www tektronix com Tektronix 077 0586 00 S Copyright Tektronix rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc Additional trademark statements can be added here Contacting Tektronix Tektronix Inc 14150 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Warranty Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three 3 years from the date of original purchase from an authorized Tektronix distributor If the product proves defective during this warr
4. 2 2 2 23 Equipment required Toe REI 24 Perfortiance conditions oce eeepc beso ac eA 25 Enable the Service Mode CREE HP 25 Save Recall equ e sen EE A deans 25 Clear CAI Data menu i 25 Reference Clock E 26 Flainess eel ee eme tuse a Eee 27 Resetting the serial 2 2 2 2 0 30 Resetting the MAC t eese heb deese retra 30 AFG2021 Service Manual i Table of Contents 31 Service preparatih i nia heed ees ERES SERE ake roD Ee e ia 31 Preventing dls Eo ore dod made TET 31 Preventive maintenance uie e pere Oe ore RE FREU pode ER ee FEED 32 Inspection and cleaning re Veh xg aee oe RE ER EE es 33 Removal and installation 37 After repam adj stiments qe eta ee Re E SUA esa TER decker NOST 38 Before disassembly 2 ehe eese mesh ese
5. Ground isolation Available Context sensitive Help system Instrument help available in multiple languages ArbExpress Software Waveform creation and editing tool software Operating basics Installation Use the following information to safely install your instrument Operating requirements following information and figure describe temperature clearance and power supply operating requirements of the instrument 419 1 mm 16 50 in 0505050505050 5055865580868 92926222929262 E 82246445201 y ZI 2926 067 Figure 1 Instrument dimensions Environmental Clearance When placing the instrument on a cart or bench observing the requirements following clearance requirements B Sides 50 mm 2 in m Rear 50 2 in Temperature Before operating the instrument ensure the ambient temperature is between 0 to 50 32 F to 122 F CAUTION ensure proper cooling keep both sides of the instrument clear of obstructions Power supply Source voltage and frequency 100 V to 240 V 50 Hz to 60 Hz or 115 V 400 Hz requirements Power Consumption 60 W WARNING 70 reduce the risk of fire and shock ensure that the mains supply voltage fluctuations do not exceed 10 of the operating voltage range 8 AFG2021 Service Manual Operating basics Power the instrument on an
6. oU VERS 69 Parts ordering information doe rere Fees eeu poe e ERE pea SE pesos 69 Using the replaceable parts 84 2 mme eme mense emen 70 AFG2021 Service Manual List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Instrument amp Fuse and fuse adapter obe E Eee PR DT AREE LESEN Eres aD 12 AFPG2021 block diagram eoe teet tent ete REESE e CERES EEFERU 19 tests 41000 dev ete ene Ie n Re a eren RUE ee Nx MR Fre ent Eggs 26 Flatness adjustment connections 2 27 Positioning the handle for removal 2 2 4 39 Location of the case retaining 8 01 1 0 ens 40 Removing th rear Case sii essere rhe SUUS 41 Location of the knob retaining 2 2 41 Location of the front panel cover retaining screws 4 4 42 Removing the front panel cover and rubber 2 4 43 Disconnecting the front p
7. Figure 10 Location of the front panel cover retaining screws 42 AFG2021 Service Manual AFG2021 Service Manual Removal and installation procedures 6 Pull the front cover away from the instrument taking care not to damage the rubber keypad that attaches to the front cover Rubber keypad 0586 013 Figure 11 Removing the front panel cover and rubber keypad Installation To install the front cover perform the removal procedure in reverse order Use the torque limiting screwdriver to tighten the four front cover retaining screws to 0 49 N m 43 Removal and installation procedures LCD display and Front Panel board removal installation Required equipment You will need a torque limiting Torx T8 screwdriver for this procedure Removal The LCD display is attached to the Front Panel board To replace the LCD display you must first remove the Front Panel board from the chassis To remove the LCD display and the Front Panel board perform the following steps 1 Remove the front panel cover See page 42 Front panel cover removal installation 2 Disconnect the ribbon cable from the Main board by pulling up evenly on both sides of the connector tab to release the cable See Figure 12 CAUTION prevent damage to the cable connector pull up evenly on both sides of the connector housing The housing slides up and down to create a compression fit with the cable and will lift approximately 1 mm to release the c
8. b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES W16 15AUG04 Table of Contents General safety SUIIWIAEy Service Safety 1 Preface 3 Manual quem 3 Mari al conventions AERON 3 Finding other 2 2 4 MEET 5 Strategy fOr SerViCiN
9. The procedures in this manual should be performed only by a qualified service person Read the General safety summary and the Service safety summary See page v Read the operating requirements for the instrument See page 8 Installation When using this manual for servicing be sure to follow all of the warnings cautions and notes This manual contains the information needed for periodic maintenance of the arbitrary function generator Further it contains information for corrective maintenance down to the module level To isolate a failure to a module use the troubleshooting procedures found in the Maintenance section To remove and replace any failed module follow the instructions in the Removal and Installation Procedures subsection After isolating a faulty module replace it with a fully tested module obtained from the factory The Replaceable Parts List section contains part number and ordering information for all replaceable modules Introduction Tektronix service offerings Warranty repair service Self service For more information Tektronix provides service to cover repair under warranty as well as other services that may provide a cost effective answer to your service needs Tektronix service technicians are well trained to service the arbitrary function generator They have access to the latest information on improvements to the AFG2021 generator as well as new options Tektronix warrants this produc
10. 11 SCREW MACHINE 2 56 0 3121 TORX T8 HEAD STEEL ZINC FINISH 10 850 0201 00 1 ASSEMBLY DISPLAY COLOR 1 260 2934 00 1 SWITCH KEYPAD FRONT PANEL 12 220 0265 00 3 NUT PLAIN HEX 0 5 28 0 625 HEX BRS NKL PL 13 210 1544 00 3 WASHER SPRING 0 610 OD X 0 490 ID X 0 007 WAVE SHAPE STAINLESS STEEL 14 878 0575 00 1 CIRCUIT BOARD ASSY FRONT BNC INSULATOR 389442300 UNTESTED 15 878 0585 00 1 CIRCUIT BOARD ASSY FRONT PANEL 4 LAYERS AFG2021 Service Manual 389446100 UNTESTED 71 Replaceable parts Figure 31 Front panel assembly exploded diagram AFG2021 Service Manual 72 Replaceable parts Table 8 Chassis assembly replaceable parts See Figure 32 Fig amp Serial Serial index Tektronix part no no no number effective discont d Qty Name amp description 32 Chassis assembly exploded diagram 01 441 2661 00 1 FRONT SHIELDING COVER 0 039IN THICK AL 5052 H32 02 211 0101 00 8 SCREW MACHINE 4 40 X 0 25 FLH 100 DEG ZINC PLATED STEEL T8 03 441 2648 00 1 CHASSIS ASSEMBLY MAIN CHASSIS SIMPLE VERSION SAFETY CONTROLLED 441 2647 00 1 CHASSIS ASSEMBLY MAIN CHASSIS OPTION GL VERSION SAFETY CONTROLLED 04 335 2582 01 C010244 1 LABEL REAR PANEL SIMPLE VERSION 0 010 PC FILM LEXAN W ADHESIVE BACK SAFETY CONTROLLED 335 2603 01 C010244 1 LABEL REAR PANEL FULL OPTION GL VERSION 0 010 PC FILM LEXAN W ADHESIVE BA
11. Broken shells cracked Repair or replace the defective insulation and deformed modules Clear or wash out dirt contacts Dirt in connectors Carrying handle bail Correct operation Repair or replace the defective cabinet feet module AFG2021 Service Manual 33 Maintenance Exterior cleaning Perform the following steps to clean the exterior of the arbitrary function generator 1 Remove loose dust on the outside of the arbitrary function generator with a lint free cloth Use care to avoid scratching the clear glass display shield 2 Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not use abrasive cleaners CAUTION To prevent getting moisture inside the arbitrary function generator during external cleaning use only enough liquid to dampen the cloth or applicator To avoid damage to the surface of the arbitrary function generator do not use any abrasive or chemical cleaning agents Flat panel display cleaning display is a soft plastic display and must be treated with care during cleaning CAUTION Imported cleaning agents or methods can damage the flat panel display Avoid using abrasive cleaners or commercial cleaners to clean the display surface Avoid scrubbing the display with excessive force Avoid spraying liquids on the display surface 1 Clean the flat panel display surface by gently rubbing the display with a clean room wipe such a
12. Limit to 50 mV 6 Push the front panel Sine button to display the waveform parameter Confirm that High and Low voltage levels were changed NOTE You cannot enter any values greater than 50 mV for High level Tek Cont Amplitude Freq 1 000 000 000 00 Offset High Level M Low Level NOTE When set limit values using the Output Menu level indicator is displayed at the left end of the graph area AFG2021 Service Manual Operating basics Front panel overview The front panel is divided into easy to use functional areas This section provides you with a quick overview of the front panel controls and the screen interface Tektronix A LO ss Ramp Puse Ab More Item Description 1 Bezel buttons 2 Return to previous menu 3 Run mode buttons 4 Help Utility and Save Recall buttons 5 Numeric keypad cancel action delete backspace and Enter buttons 6 General purpose knob 7 Arrow buttons allow you to select a specific number on the display screen when you are changing amplitude phase frequency or other such values 8 Channel On Off and Manual Trigger buttons 9 Trigger input connector 10 Trigger output connector 11 Channel output connector 12 USB connector 13 Function butto
13. internal fuse to open and the output is stopped If the fuse opens you need to contact your local Tektronix Service Support When a potential voltage exists between the common ground and chassis ground short circuiting between them may lead to excessive current flow and the internal or external circuits may be damaged WARNING To prevent electrical shock use this product so that the sum of the floating voltage and the output voltage of the instrument does not exceed 42 Vpk Do not touch the center of the BNC while the equipment is in use T Common ground 2 77 Chassis ground 2926 04 13 Operating basics Protect your DUT 14 Use care when you connect the instrument Channel Output to your DUT device under test To avoid damage to your DUT the following preventive measures are provided Follow these steps to set the limit values for high level and low level 1 Push the Output Menu bezel button 2 Push the Limit bezel button Load Impedance Frequency Invert Period Phase Menu On Amplitude Level Limit Menu Run Mode enu Noise Output 2906024 3 Push the High Limit bezel button 4 Notice that in this example High Limit is set to 5 000 V and Low Limit is set to 5 000 V Noise Add Off Noise Level 1096 Invert off 5 Use the numeric keys the general purpose knob to set the High Limit to 50 mV and the Low
14. mus LAN x 10 100 M 5 0586 006 Use screw driver or tweezer to lift label from the rear panel Figure 23 Location to start removing the rear panel label 5 Slowly peel back the label to minimize the glue residue left on the chassis while removing the label After the label is lifted use thumb and index finger to carefully peel label from rear panel 0586 007 Figure 24 Peeling off the rear panel label 54 AFG2021 Service Manual Removal and installation procedures 6 Locate the two fan retaining screws on the rear panel remove them and lift the fan out of the chassis NOTE Step 6 only applies to instruments with a serial number of 010244 or greater Installation To install the fan perform the removal procedure in reverse order Be aware of the following m Tighten the two self tapping retaining screws for the fan to 1 13 N m m When you install the new rear panel label use the two holes shown below to align the label on the rear panel Only applies to instruments with a serial number of C010243 or earlier 100 240 V 50 60 Hz 115 V 400 Hz WARNING To avoid electrical shock the unit must be properly grounded EO 10 100 M 0586 008 Use these two holes to position the label Figure 25 Aligning the rear panel label Option GL shown AFG2021 Service Manual 55 Removal and installation procedures AC
15. name identification 70 Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 AFG2021 Service Manual Replaceable parts Table 7 Front panel assembly replaceable parts See Figure 31 Serial Fig amp Tektronix part Serial no index no no effective discont d Qty Name amp description 31 Front panel assembly exploded diagram 1 367 0558 00 1 HANDLE CARRYING SILVER GRAY 2 200 5159 00 1 COVER FRONT BOOT CAP TEK SILVER GRAY 3 366 0896 00 1 PUSH BUTTON POWER 4 366 0863 00 1 ASSEMBLY KNOB WITH RETAINER CLIP 0 685 DIAMETER 5 335 2559 00 1 LABEL FRONT PANEL AFG2021 ENGLISH 335 2680 00 1 LABEL FRONT PANEL AFG2021 FRENCH 335 268 1 00 1 LABEL FRONT PANEL AFG2021 ITALIAN 335 2682 00 1 LABEL FRONT PANEL AFG2021 GERMAN 335 2683 00 1 LABEL FRONT PANEL AFG2021 SPANISH 335 2684 00 1 LABEL FRONT PANEL AFG2021 JAPANESE 335 2685 00 1 LABEL FRONT PANEL AFG2021 SIMPLIFIED CHINESE 335 2686 00 1 LABEL FRONT PANEL AFG2021 STANDARD CHINESE 335 2687 00 1 LABEL FRONT PANEL AFG2021 KOREAN 335 2688 00 1 LABEL FRONT PANEL AFG2021 RUSSIAN 335 2715 00 1 LABEL FRONT PANEL AFG2021 PORTUGUESE 6 211 0101 00 4 SCREW MACHINE 4 40 X 0 25 FLH 100 DEG ZINC PLATED STEEL T8 7 335 2560 00 1 LABEL NOMENCLATURE AFG2021 8 202 0486 00 1 CASE FRONT PC ABS PLASTIC BLEND TEK GRAY SAFETY CONTROLLED 9 211 1129 00
16. prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures Use proper power cord Use only the power cord specified for this product and certified for the country of use Ground the product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe all terminal ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Power disconnect The power cord disconnects the product from the power source Do not block the power cord it must remain accessible to the user at all times Do not operate without covers Do not operate this product with covers or panels removed Do not operate with suspected failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid exposed circuitry Do not touch exposed connections and components when power is present Do not operate in wet damp co
17. the arbitrary function generator to the power meter with a power head as shown in the following figure AFG2021 Power meter E oca m a O gt seem Channel output Power Head 50 BNC coaxial cable Figure 5 Flatness adjustment connections 2 Set up the arbitrary function generator as follows a Push the Sine button on the front panel b Push the Frequency Period Phase Menu bezel button c Push the Frequency bezel button it will turn dark when activated and use the numeric keypad or general purpose knob to set the frequency to 100 0000 kHz d Push the button on the front panel to return to the top menu e Push the Amplitude Level Menu bezel button f Push the more bezel button g Push the Units bezel button and then push the dBm bezel button to change the voltage units to dBm h Push the more bezel button 27 Adjustment procedures i Push the Amplitude bezel button it will turn dark when activated and use the numeric keypad or general purpose knob to set the amplitude to 4 0 dBm j Check that the Channel On Off front panel button LED is lit If it 1s not lit then the channel output is off Push the Channel On Off button to turn it on 3 Setthe frequency of the power meter to 100 kHz and compensate the power meter so that the readin
18. CK SAFETY CONTROLLED 335 2582 00 C010243 1 LABEL REAR PANEL SIMPLE VERSION 0 010 PC FILM LEXAN W ADHESIVE BACK SAFETY CONTROLLED 335 2603 00 C010243 1 LABEL REAR PANEL FULL OPTION GL VERSION 0 010 PC FILM LEXAN W ADHESIVE BACK SAFETY CONTROLLED 05 441 2651 00 1 ENCLOSURE TOP SAFETY CONTROLLED 06 200 5152 00 1 COVER REAR BOOT CAP TEK BLUE SAFETY CONTROLLED 07 342 1135 00 7 INSULATOR BSHG NYLON 0 509 X 0 470 D HOLE X 0 687 OD X 0 035 T 08 131 6521 00 1 CONTACT ELEC EMI CLIP ON 0 38 L X 0 460 W 2 CONTACTS X 0 45 HIGH ELECTROLESS NICKEL PLATE 09 211 1272 00 15 SCREW MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 10 174 6018 00 1 CABLE ASSY PITCH 0 5MM FRONT PANEL TO MAINBOARD 11 679 6514 02 1 CIRCUIT BOARD ASSY SIMPLE VERSION 70 CPU MAIN BOARD 389442400 UNTESTED 679 6531 02 1 CIRCUIT BOARD ASSY OPTION GL VERSION A70 CPU MAIN BOARD 389442400 UNTESTED 12 213 1152 00 4 13 342 1228 00 1 PWR INSULATOR PROTECTION COVER 14 119 7271 03 1 POWER SUPPLY AC DC 150 W MAX IN 87 264 VAC 47 63 HZ 100 127 VAC 360 440 HZ IN 4 3V 2 3A 7 5V 3 2A 18V 2A 18V 2A OUT SAFETY CONTROLLED 15 174 5926 00 1 ASSY SP INLET POWER 16 210 1539 00 1 WASHER LOCK 8 INTL 0 02 THK STEEL ZINC FINISH AFG2021 Service Manual 73 Replaceable parts Table 8 Chassis assembly replaceable parts See Figure 32 cont F
19. G2021 instrument connect together 1 1 I 1 Ext 1804 1101 O Trigger In Mod vi 157 1 1 I Ext J805 1102 Trigger out RefIN VI Main board IV b 1 USB 03 1501 2 Output Memory IV GPIB J601 J1001 FAN I 1 LAN 701 J505 USB I 1 1 1801 1802 J803 J901 J401 0 N Ue oes Power Supply module Front kanel Soaig AC In includes LCD display al E 0586 002 Figure 30 Interconnections for the AFG2021 AFG2021 Service Manual 67 Diagrams 68 AFG2021 Service Manual Replaceable parts This section contains a list of the replaceable modules for the AFG2021 Arbitrary Function Generator Use this list to identify and order replacement parts Parts ordering information AFG2021 Service Manual Replacement parts are available through your local Tektronix field office 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 Instru
20. NC Insulator board Installation To install the Front BNC Insulator board perform the removal procedure in reverse order Use the torque limiting screwdriver to tighten the two board retaining screws to 0 49 N m Put the BNC washers on before the nuts and then use the torque wrench to tighten the three BNC nuts to 1 38 N m 47 Removal and installation procedures Front chassis and main chassis separation Required equipment You will need a 16 mm 5 8 inch deep socket with wide center hole torque wrench and torque limiting Torx T8 screwdriver for this procedure Removal To remove the front chassis perform the following steps 1 Remove the front panel cover See page 42 Front panel cover removal installation 2 Disconnect the ribbon cable from the Front Panel board from the Main board as shown below Lift both sides of connector tab Figure 15 Disconnecting the ribbon cable from the Main board 3 Use the torque wrench with a 16 mm 5 8 inch deep socket with wide center hole to remove the nut and washer from each of the three BNC connectors 4 Remove the power button by grasping the button and pulling it off of the shaft 48 AFG2021 Service Manual Removal and installation procedures Remove the retaining screws on each side of the chassis as shown below 0586 022 Figure 16 Location of the front chassis retaining screws 6 Gently pull out the front chassis toward the front to remove the front cha
21. able You may need to remove the Power Supply board to gain access to the connector The ribbon cable connects to the back of the Front Panel board using the same kind of connector The following figure shows the connector on the back of the board in the raised unlatched position Lift both sides of connector tab 0586 016 Figure 12 Disconnecting the front panel ribbon cable from the Main board 44 AFG2021 Service Manual Removal and installation procedures 3 Remove the Front Panel board by first removing the five retaining screws shown below and then removing the four screws attaching the LCD display to the Front Panel board CAUTION prevent damage to the LCD display be careful when you remove the retaining screws holding the LCD display to the Front Panel board The LCD display will detach from the Front Panel board when the four LCD display retaining screws are removed and will be connected to the board by only the ribbon cable of the LCD display 0586 014 2 Remove LCD screws second 4 Remove these screws first Figure 13 Removing the Front Panel board AFG2021 Service Manual 45 Removal and installation procedures 4 Toremove the LCD display from the Front Panel board disconnect the ribbon cable from the back of the board CAUTION To prevent damage to the LCD cable connector pull up evenly on both sides of the connector housing The housing pivots up and down to create a compression fi
22. able from the Main board See Figure 22 on page 53 Remove the cable between the Main board and the AC line filter Use needle nose pliers to lift up the edge of the rear panel label at the bottom right corner See Figure 23 on page 54 Slowly peel back the label to minimize the glue residue while removing the label See Figure 24 on page 54 Option GL only Remove the two jack screws and washers retaining the GPIB connector Remove the two screws retaining the BNC cover plate Remove the BNC insulator from each BNC and then remove the BNC nuts and washers 10 Remove the two screws retaining the Rear BNC Insulator board 57 Removal and installation procedures 58 11 Remove the six screws and four stand offs retaining the Main board to the chassis Power Supply module stand offs 0586 015 Figure 27 Location of Main board retaining screws and stand offs 12 Carefully slide the Main board forward until the connectors clear the rear panel and then lift the board out of the instrument AFG2021 Service Manual AFG2021 Service Manual Removal and installation procedures Installation To install the Main board perform the removal procedure in reverse order Be aware of the following NOTE Afier you replace the Main board you must reset the instrument serial number See page 30 Resetting the serial number Correctly orient the plastic BNC insulator on each front BNC before you install the Mai
23. also be found on the Tektronix Web site www tektronix com downloads Document name Description AFG2021 Quick Start User Manual A quick reference to major features of the instrument and how they operate It also provides several tutorials to familiarize you with basic instrument features AFG2021 Specifications and Performance Verification Technical Reference A source for complete instrument specifications and a procedure for verifying the performance of the instrument AFG2021 Programmer Manual An encyclopedia of topics that describe the arbitrary function generator interface and features and gives background information on how to use them It provides Menu Structures User Interface and Programming Information AFG2021 Online Help An online help system integrated with the User Interface application that ships with this product The online help is preinstalled in the instrument AFG2021 Declassification and Security Instructions A source for instructions on how to declassify the instrument AFG2021 Service Manual Introduction Strategy for servicing AFG2021 Service Manual This manual contains information that is needed to properly service the AFG2021 Arbitrary Function Generator as well as general information that is critical to safe and effective servicing To prevent personal injury or damage to the arbitrary function generator consider the following before attempting service
24. anel ribbon cable from the Main board 44 Removing the Front Panel board 45 Disconnecting the LCD display cable esses 46 Disconnecting the ribbon cable from the Main 48 Location of the front chassis retaining screws 2 49 Correct position of the EMI clip for the USB 2 2 50 Figure 18 Correct orientation of BNC 2 2 0 50 Figure 19 Correct orientation of power 2 04 50 Figure 20 Location of the Power Supply module cables and retaining 8 51 Figure 21 Positioning the power supply shield on the 52 Figure 22 Location of the fan cable 2 2 0 53 Figure 23 Location to start removing the rear panel 2 2 2 54 Figure 24 Peeling off the rear panel label sss n 54 Figure 25 Aligning the rear panel label Option GL 4 4 2 22 55 Figure 26 AC line filter cable 8 222 56 Figure 27 Location of Main board retaining screws and
25. anty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product Batteries are excluded from this warranty Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All replaced parts modules and products become the property of Tektronix In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix shipping charges prepaid and with a copy of customer proof of purchase Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product
26. anual Diagnostics Power on diagnostic test Utility menu diagnostic test AFG2021 Service Manual Troubleshooting When you power on the AFG2021 the instrument automatically executes a diagnostic test for all the diagnostics items before the Startup screen appears When an error is detected the diagnostic test displays an error message If you see such an error message press the OK button to proceed with the next step The AFG2021 software starts When the AFG2021 contains an unresolved error the test cannot be conducted normally This procedure uses internal routines to verify that the instrument is operating correctly Prerequisites Before you run the Utility menu diagnostic test Power on the instrument and allow a 20 minute warm up before doing this procedure The instrument must be operating at an ambient temperature between 0 C and 50 C Procedure Perform the following steps to run the Utility menu diagnostic test 1 Select Execute Diagnostics in the Utility menu Utility gt more gt Diagnostics Calibration gt Execute Diagnostics Wait until the test is completed Verify that the diagnostic test passed Ifthe diagnostic completes without finding any problems the message PASSED is displayed When an error is detected during diagnostic execution the instrument shows an error code See page 65 Diagnostic error codes Press any front panel button to exit from the diagnostics t
27. c routines of the arbitrary function generator and troubleshooting trees Service preparation Only qualified persons should perform service procedures Before performing any service procedures read the General Safety Summary and Service Safety Summary sections of this manual and the preventing ESD information below Refer to the Operating Information section and your arbitrary function generator user manual for information about using the arbitrary function generator Preventing ESD When performing any service that requires internal access to the arbitrary function generator adhere to the precautions on page 6 2 These precautions will help you avoid damaging internal modules and their components due to electrostatic discharge ESD CAUTION Static discharge can damage any semiconductor component in this arbitrary function generator Minimize handling of static sensitive modules B Transport and store static sensitive modules in their static protected containers or on a metal rail Label any package that contains static sensitive modules AFG2021 Service Manual 31 Maintenance Preventive maintenance 32 General care Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Service static sensitive modules only at a static free work station Do not allow anything capable of generating or holding a static charge on the work station surface Handle ci
28. case perform the removal procedure in reverse order Use the torque limiting screwdriver to tighten the four retaining screws to 0 49 N m Front panel knob removal installation Required equipment None Removal Firmly grasp the knob and pull it away from the shaft Installation Align the keyed knob with the shaft and press the knob onto the shaft NOTE There is a clip located inside the back of the knob to help retain the knob on the shaft as shown below If the knob is loose or will not stay on the shaft verify that the clip is properly seated inside the knob and that the clip is not broken 0586 015 Figure 9 Location of the knob retaining clip AFG2021 Service Manual 41 Removal and installation procedures Front panel cover removal installation Required equipment You will need a torque limiting Torx T8 screwdriver for this procedure Removal To remove the front panel perform the following steps 1 Remove the handle from the instrument See page 39 Handle removal installation 2 Remove the case See page 40 Case removal installation 3 Remove the front panel knob See page 41 Front panel knob removal installation 4 Remove the rubber boot from the front panel by carefully pulling it off of the front of the instrument Note the orientation of the boot for reinstallation 5 Remove the four retaining screws two on each side that attach the front cover to the chassis Remove these screws
29. cribes the error codes and lists the related modules Table 5 Error codes Error code Description Calibration 1101 CH1 Internal offset calibration failure 1103 CH1 Output offset calibration failure 1105 CH1 Output gain Calibration failure 1201 CH1 x3dB attenuator calibration failure 1203 CH1 attenuator calibration failure 1205 CH1 x10dB attenuator calibration failure 1207 1 x20dB 1 attenuator calibration failure 1209 1 x20dB 2 attenuator calibration failure 1211 1 Filter calibration failure 1301 1 Sine Flatness calibration failure 1401 1 ASIC TINT calibration failure 1403 CH1 ASIC SGEN calibration failure 1405 CH1 ASIC clock duty calibration failure Diagnostics 2100 Calibration data not found 2101 Calibration data checksum 2102 Calibration data invalid 2201 ASIC1 memory failure 2203 ASIC1 Overheat Output Diagnostics 2301 CH1 Internal offset failure 2303 CH1 Output offset failure 2305 CH1 Output gain failure 2401 CH1 x3dB attenuator failure 2403 1 attenuator failure 2405 CH1 x10dB attenuator failure 2407 CH1 x20dB 1 attenuator failure 2409 1 x20dB 2 attenuator failure 2411 CH1 Filter failure 2413 1 x20dB 3 attenuator failure 2501 1 Sine Flatness failure 65 Troubleshooting 66 AFG2021 Service Manual Diagrams The diagram in this section shows how the modules in the AF
30. d off The following procedures show you how to apply power to the instrument and turn it on and off CAUTION This product will not function with the rear feet in the down position Ensure they are raised before instrument setup Power To turn apply power to the instrument and turn it on do the following 1 Insert the AC power cord into the power Im receptacle on the rear panel and the other end into a properly grounded power outlet 2 Push the front panel power button to power on the instrument NOTE Wait until the front panel display shows that the instrument has passed all power on self tests before using the instrument P Power off turn the instrument off do the following 1 Push the front panel power button to power off the instrument HO C a D 2E OC OCOCOCO 2926 003 AFG2021 Service Manual 9 Operating basics Perform instrument self test and self calibration The instrument performs a limited set of hardware tests at power on You can also perform the follo
31. djustment procedures See page 23 Adjustment procedures Before disassembly Before you disassemble the instrument do the following Review how to prevent ESD damage See page 31 Preventing ESD m Review the exploded view diagrams in the Replaceable parts section for an overview of how the entire arbitrary function generator is assembled See page 69 B Review the required equipment list to verify that you have the necessary tools to remove and install modules in the arbitrary function generator See page 38 Equipment required for disassembly Equipment required for disassembly Use the following tools to remove and replace all modules Torque limiting screwdriver long shank 8 Ib in 0 85 N m range with Torx T8 and 15 tips 16mm 5 8 inch deep socket with wide center hole 7mm 9 32 inch socket Torque wrench to 30 in Ib 3 3 N m Screwdriver with 1 4 inch flat blade Phillips head screwdriver m Pliers all purpose and needle nose Tweezers 38 AFG2021 Service Manual Removal and installation procedures Handle removal installation Required equipment None AFG2021 Service Manual Removal To remove the handle perform the following steps 1 Place the arbitrary function generator bottom down soft surface such as an antistatic mat Rotate the handle to the vertical position as shown below Grasp the handle on one side and pull outward until the handle is clear of the c
32. e amplifier is amplified and output LPF is used when a sine wave is output Trig Out circuit Sync Out signal from GoC ASIC is level converted to Trigger Out ADC Modulation by an external source is performed by digitally sampling the external input from the Ext Modulation Input connector AFG2021 Service Manual Front Panel board Front panel module LCD display module Power Supply module BNC Insulator boards Front BNC Insulator board Rear BNC Insulator board AFG2021 Service Manual Theory of operation Local regulator Supplies the necessary 1 8 V 3 3 V 15 V and 15 V power On Off relay On Off of the output signal Calibration circuit DC Calibration of the output signal is done by a 16 bit AD Converter 50 mm by 50 mm size DC 12 V type fan It is driven by fan controller in the CPU section The Front Panel controls a rubber button matrix LED a buzzer and a rotary encoder The display is a 3 5 inch QVGA 320 x 240 color TFT LCD The power supply module provides 4 3 V 15 V and 5 V to the circuit This power supply module accepts the input voltage within the range of 250 VAC from 90 VAC This board insulates the I O signals on the front panel BNC connectors from the chassis This board insulates the I O signals on the rear panel BNC connectors from the chassis 21 Theory of operation 22 AFG2021 Service Manual Adjustment procedures This section describes
33. ere eese 38 Equipment required for disassembly 2 2 38 Handle removal installation 2 eme meme e 39 Gase removalAnstallati n iiit e eee eese e SLE ERR EIE EE E Se E LS See FER 40 Front panel knob 2 2 eme 41 Front panel cover removal installation sss 2 2 2 42 LCD display and Front Panel board 40 44 Front BNC Insulator board removal installation cesses 47 Front chassis and main chassis separation 22 2 48 Power Supply module 1 4 2 2 2 2 51 Fan remoyalAnstallation sisi essen Wie asl E e A vdd eae RUE ERI dee ue Te ed 53 AC line filter removal installation 2 e eme meme eee 56 Main board removal installation 2 2 2 eene 57 Areubleshooting 53 Rieck 61 Troubleshooting tools and equipment 22 22 61 Troubleshooting Ut ER dig oa reet ers EE eere s 61 DIAGNOSTICS mm 63 Di srams 67 Replaceable parts i tu e iR REN VERE TAE RR RE
34. es their descriptions and their Tektronix part numbers This manual uses certain conventions that you should become familiar with Some sections of the manual contain procedures for you to perform To keep those instructions clear and consistent this manual uses the following conventions Front panel controls and menu names appear in the same case initial capitals all uppercase and so on in the manual as is used on the arbitrary function generator front panel and menus Front panel labels are all upper case letters for example MENU SELECT PULSE GEN and so on Instruction steps are numbered unless there is only one step Throughout this manual any replaceable component assembly or part of the arbitrary function generator is referred to generically as a module In general a module is an assembly like a circuit board rather than a component like a resistor or an integrated circuit Sometimes a single component is a module for example the chassis of the arbitrary function generator is a module Preface Safety Symbols and terms related to safety appear in the Safety Summary near the beginning of this manual Finding other information See the following list for other documents supporting the arbitrary function generator All documents except the Online Help and the Declassification and Security Instructions are located on the 4FG2021 Documentation CD ROM that shipped with your instrument Product documents can
35. est 63 Troubleshooting Calibration diagnostic test 64 This procedure uses internal routines to verify that the instrument is operating correctly Prerequisites Before you run the Calibration diagnostic test B Power on the instrument and allow a 20 minute warm up before doing this procedure An ambient temperature is between 20 C and 30 C Procedure Perform the following steps to run the internal routines that confirm basic functionality and proper adjustment WARNING To prevent the loss of data do not turn off the power while executing calibration If the power is turned off while the calibration is in progress data stored in internal nonvolatile memory may be lost 1 Select the Execute Calibration in the Utility menu Utility gt more gt Diagnostics Calibration gt Execute Calibration 2 Wait until the test is completed 3 Verify that the diagnostic test passed Ifthe diagnostic completes without finding any problems the message PASSED is displayed When an error is detected during diagnostic execution the instrument shows an error code See page 65 Diagnostic error codes 4 Press any front panel button to exit from the calibration test AFG2021 Service Manual Diagnostic error codes AFG2021 Service Manual Troubleshooting If a diagnostic test detects a malfunction the character string Fail and the associated error code is displayed The following table des
36. g value at 100 kHz may become 0 dB with the frequency dependent offset function Then set up the power meter to the relative measurement mode 4 Change the frequency of the power meter setting to 5 MHz so that it is the same as the arbitrary function generator frequency 5 The power meter shows the value difference from the reference value which is 0 30 Set this value to the Flatness field of the arbitrary function generator 28 AFG2021 Service Manual AFG2021 Service Manual Adjustment procedures 6 Repeat steps 4 through 5 until the setting of the arbitrary function generator is 20 MHz The output signal frequency of the arbitrary function generator increases in 5 MHz steps every time you increase the frequency Set the frequency of the power meter to the same frequency of the arbitrary function generator in step 4 29 Adjustment procedures Resetting the serial number When you replace the A72 CPU board you must set the serial number Perform the following procedure to set the serial number 1 Enable the Service mode See page 25 Enable the Service mode 2 Push the Utility gt more gt more buttons 3 Push the Service Menu gt Factory Initialize gt Serial Number buttons 4 Enter the serial number using the numeric keys and Function buttons NOTE Use the Function buttons to enter alphabetical characters The Sine to More button corresponds to A through 5 Push the OK button Rese
37. hassis as shown below Lift the handle clear of the chassis Pull out and lift up to remove handle 0586 009 Figure 6 Positioning the handle for removal Installation To install the handle perform these steps 1 Place the arbitrary function generator bottom down on a soft surface such as an antistatic mat Hook one side of the handle into the hole on the side of the instrument See Figure 7 Grasp the handle on the other side and pull outward until the handle clears the chassis and then slide the handle down so that the handle fits into the hole in the side of the instrument 39 Case removal installation Required equipment You will need a torque limiting Torx T8 screwdriver to remove and install the case Removal To remove the case perform the following steps 1 Place the arbitrary function generator on a soft surface such as an antistatic mat 2 Remove the rubber boot from the rear panel by pulling it off of the rear of the instrument Note the orientation of the boot for reinstallation 3 Use a screwdriver with a Torx 8 bit to remove the four screws located on the bottom of the case 0586 010 Remove these screws Figure 7 Location of the case retaining screws 40 AFG2021 Service Manual Removal and installation procedures 4 Slide the case off the rear of the arbitrary function generator Slide case off Figure 8 Removing the rear case Installation To install the rear
38. ig amp Serial Serial index Tektronix part no no no number effective discont d Qty Name amp description 17 196 3496 00 1 LEAD ELECTRICAL 18 AWG 4 0 L 5 4 SAFETY CONTROLLED 18 119 7255 00 1 FILTER EMI AC LINE FILTER 3 0A 115 250VAC 50 60HZ IEC INPUT FAST ON SOLDER LUG OUTPUT CHASSIS MOUNT SAFETY CONTROLLED 19 119 7780 XX 1 FAN DC ASSEMBLY 20 213 1150 00 2 SCREW FLAT HEAD T15 FAN SCREW M5X10 21 210 0056 00 2 WASHER LOCK 10 SPLIT 0 047 THK SI BRZ NP 22 213 1061 00 2 JACKSCREW 6 32 EXT THD M3 5 X 0 6 6 INT THD ZINC PLATED STEEL 23 878 0574 00 1 CIRCUIT BOARD ASSY REAR BNC INSULATOR 389442200 UNTESTED 24 210 1544 XX 2 WASHER SPRING 0 610 OD X 0 490 ID X 0 007 THK WAVE SHAPE STAINLESS STEEL 25 220 0265 00 2 NUT PLAIN HEX 0 5 28 X 0 625 HEX BRS NKL PL 26 386 7634 00 1 BNC COVER 27 131 6363 00 1 EMI GASKET GROUNDING 0 320 L X 0 365 W 2 CONTACTS X 0 110 DEEP ELECTROLESS NICKEL PLATE 74 AFG2021 Service Manual Replaceable parts Figure 32 Chassis assembly exploded diagram 75 AFG2021 Service Manual
39. ing screws from the Power Supply module and lift the module out of the chassis Figure 20 Location of the Power Supply module cables and retaining screws AFG2021 Service Manual 51 Removal and installation procedures Installation To install the Power Supply module perform the removal procedure in reverse order Be aware of the following sure that the holes on the bottom of the power supply shield fit over each of the stand off posts See Figure 21 Tighten the four retaining screws on the Power Supply module to 0 88 N m 0586 024 Figure 21 Positioning the power supply shield on the stand off posts 52 AFG2021 Service Manual Removal and installation procedures Fan removal installation Required equipment You will need a torque limiting Torx T15 screwdriver and tweezers for this procedure Removal To remove the fan from the rear chassis perform the following steps 1 Remove the Power Supply module See page 51 Power Supply module removal installation 2 Disconnect the fan cable from the Main board Figure 22 Location of the fan cable 3 Check the serial number of the instrument you are servicing If the number is C010243 or earlier proceed to step 4 If the number is 10244 or greater proceed to step 6 4 Use needle nose pliers to lift up the edge of the rear panel label at the bottom right corner AFG2021 Service Manual 53 Removal and installation procedures WARN the unit
40. line filter removal installation Required equipment You will need a torque limiting Torx T15 screwdriver for this procedure Removal To remove the line filter perform the following steps 1 Remove the Power Supply module See page 51 Power Supply module removal installation 2 Disconnect the cables from the AC line filter 3 Remove the two retaining screws attaching the AC line filter to the chassis and pull the filter out from the chassis Installation To install the AC line filter perform the removal procedure in reverse order Be aware of the following m Tighten the two AC line filter retaining screws for the fan to 0 88 N m m If you removed the earth lead to the chassis tighten the retaining screw to 0 88 N m Reconnect the AC line filter cables as shown below 0586 020 Figure 26 AC line filter cable connections 56 AFG2021 Service Manual Removal and installation procedures Main board removal installation AFG2021 Service Manual Required equipment You will need a torque limiting Torx T8 and 15 screwdriver a torque wrench 16 mm 5 8 inch deep socket 7 mm socket and needle nose pliers for this procedure Removal To remove the Main board perform the following steps 1 Remove the Power Supply module See page 56 AC line filter removal installation Separate the front chassis and main chassis See page 48 Front chassis and main chassis separation Disconnect the fan c
41. ment type or model number Instrument serial number Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number 69 Replaceable parts Using the replaceable parts list This section contains a list of the mechanical and or electrical components that are replaceable for the arbitrary function generator Use this list to identify and order replacement parts The following table describes each column in the parts list Table 6 Parts list column descriptions Column Column name Description 1 Figure amp index number Items in this section are referenced by component number 2 Tektronix part number Use this part number when ordering replacement parts from Tektronix 3 Instrument model This indicates the model of instrument that uses this item 4 and 5 Serial number Column four indicates the serial number at which the part was first effective Column five indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 6 Qty This indicates the quantity of parts used 7 Name amp description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook 6 1 for further item
42. ment will be damaged if a large DC or AC voltage is applied to the output or input connectors To protect the output circuits a fuse adapter is provided as an optional accessory When the instrument is used by students or other inexperienced users always attach the fuse adapter to the output connectors to avoid damage See the 4FG2021 User Manual for information about optional accessories 1631 061 Figure 2 Fuse and fuse adapter 1 Fuse adapter 2 Fuse AFG2021 Service Manual Floating ground AFG2021 Service Manual Operating basics Since the common input and output channels of the arbitrary function generator are electrically isolated from the chassis ground the instrument chassis and ground line of the AC connector you can make a floating connection between the instrument and other equipment All the BNC connectors are connected to the common ground and the remote interface connector 15 connected to the chassis ground CAUTION The maximum rated voltage between the chassis ground and common ground is 42 Vp p DC peak AC When the potential voltage between the chassis ground and common ground goes over 42 Vp p the internal protective circuit will be activated to protect the circuits However higher voltage may cause the internal circuits in the instrument to be damaged When a potential voltage exists between the chassis ground and common ground a short circuit from output to ground causes the instrument
43. n board in the chassis See Figure 18 on page 50 m Tighten the Rear BNC Insulator board retaining screws to 0 88 N m m Attach the wave washers then the nuts and then the BNC insulators to the rear BNCs before you install the BNC cover plate See Figure 28 Tighten the BNC cover plate retaining screws to 0 49 N m Option GL only Tighten the GPIB connector jack screws to 0 88 N m B Tighten the six Main board retaining screws to 0 88 N m tighten the four Main board stand offs for the Power Supply module to 0 49 N m 0586 028 Figure 28 Installing the rear BNC washers nuts and insulators 59 Removal and installation procedures 60 AFG2021 Service Manual Troubleshooting This section contains the following information to help you isolate faulty modules in the AFG2021 Arbitrary Function Generator Troubleshooting trees Show how to find and isolate faulty modules Diagnostics Describes the diagnostics supplied with the arbitrary function generator its operation and status messages After you troubleshoot and identify a faulty part use the Removal and installation procedures section to exchange the modules See page 37 Troubleshooting tools and equipment You may need the following tools and equipment to troubleshoot the arbitrary function generator Table 4 Troubleshooting equipment Tools and equipment Example Digital multimeter DMM 3 5 or greater digit DMM Oscilloscope wi
44. nditions Do not operate in an explosive atmosphere Keep product surfaces clean and dry Provide proper ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation General safety summary Terms in this manual Symbols and terms on the product vi These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking B CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A CAUTION Earth Terminal Mains Disconnected Mains Connected Refer to Manual Chassis Ground OFF Power ON Power AFG2021 Service Manual Service safety summary AFG2021 Service Manual Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do not service alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resusci
45. ne regularly may prevent malfunctions and enhance reliability See page 32 Preventive maintenance The collection of dirt on internal components can cause them to overheat and fail Dirt also provides an electrical conduction path that could cause an arbitrary function generator failure especially under high humidity conditions Inspect the arbitrary function generator as often as operating conditions require IN CAUTION Avoid the use of chemical cleaning agents which might damage the plastics used in this AFG2021 Arbitrary Function Generator Use only deionized water when cleaning the front panel buttons Use an ethyl alcohol solution as a cleaner and rinse with deionized water Exterior inspection Inspect the outside of the arbitrary function generator for damage wear and missing parts using the following check list as a guide arbitrary function generator that appears to have been dropped or otherwise abused should be checked thoroughly to verify correct operation and performance Immediately repair defects that could cause personal injury or cause further damage to the arbitrary function generator Table 2 External inspection check list Item Inspect for Repair action Cabinet front panel Cracks scratches Repair or replace the defective and cover deformations damaged module hardware or gaskets Front panel knobs Missing damaged or loose Repair or replace missing or knobs defective knobs Connectors
46. ns 14 Power button Lock or unlock the front If you need to lock the front panel controls use the following remote command panel controls syvgTem KLOCK STATE To unlock the front panel without using a remote command push the front panel Cancel button twice AFG2021 Service Manual 15 Operating basics Parts of the screen interface 16 Tek Cont Freq 1 000 000 000 0 00 Frequency Period Ampl 1 000 Phase Menu Offset 0 0mv Amplitude Level Menu tun Mode Manu 2926 049 Item Description 1 Bezel menu When you push a front panel button the instrument displays the corresponding menu on the right side of the screen The menu shows the options that are available when you push the unlabeled bezel buttons directly to the right of the screen Some documentation may also refer to the bezel buttons as option buttons side menu buttons or soft keys 2 Graph waveform display area This part of the main display area shows the signal as a graph or waveform 3 Level meter The top portion of the indicator shows the high limit value the bottom portion of the indicator shows the low limit value and the indicator itself shows the currently selected level 4 Parameter display area This part of the main display area shows active parameters 5 Message display area A message that monitors hardware status such as clock or trigger is displa
47. oded Remove failed module and solder connections Burned replace with a new module circuit boards Burned broken or cracked circuit run plating Solder connections Cold solder or rosin joints Resolder joint and clean with ethyl alcohol Wiring and cables Loose plugs or connectors Firmly seat connectors Repair Burned broken or frayed wiring or replace modules with defective wires or cables Chassis Dents deformations and Straighten repair or replace damaged hardware defective hardware Interior cleaning Perform the following steps to clean the interior of the instrument 1 Blow off dust with dry low pressure deionized air approximately 9 psi 2 Remove any remaining dust with a lint free cloth dampened in isopropyl alcohol 75 solution and rinse with warm deionized water A cotton tipped applicator is useful for cleaning in narrow spaces and on circuit boards NOTE If these steps do not remove all of the dust or dirt please contact Tektronix for assistance See Contacting Tektronix at the front of this manual Lubrication There is no periodic lubrication required for this instrument AFG2021 Service Manual 35 Maintenance 36 AFG2021 Service Manual Removal and installation procedures This section describes how to remove and install the major mechanical and electrical modules Any electrical or mechanical module assembly or part listed in the parts list is referred to as a module See
48. op computer security cable to secure your instrument to your location 9 Fan ventilation vent This is the ventilation opening for the fan AFG2021 Service Manual 17 Operating basics 18 AFG2021 Service Manual Theory of operation This section describes the electrical operation of the AFG2021 instrument to the module level It describes the basic operation of each functional circuit block shown in the block diagram See Figure 3 on page 19 Overview AFG2021 instrument provides a basic model with a USB interface and an option GL model which adds GPIB and LAN interfaces Power Power Supply Module Front Panel USB al USB CPU Circuit CPB GPIB MPU ROM RAM etc Isolation I F Fan CPU Section Safety Ground Area Ext Ref Mo Floating Ground Area 7 Regulators gt CLOCK PLL 18V 33V Circuit i Filter amp output Pre Amp Amplifier DC gt oO offset o Out i Chip gt Calibration i Circuit Ext Mod j i Trigger n O Output gt Trigger Generator On Circuit Trigger Input Ext Tri Circuit Generator Section 0586 001 Figure 3 AFG2021 block diagram AFG2021 Service Manual 19 Theory of operation Main board 20 CPU section Generator section CPU circuit The CPU Circuit contains an MPU Flash RAM and DRAM to control the ins
49. rameters on the Manual Calibration that 15 described in this section Each of changed parameters 15 stored in non volatile memory of the arbitrary function generator after you push the Save menu in the first page of Manual Calibration Previous adjustment parameters will be recalled after a power cycle unless you push the Save Recall menu button Clear CAL Data menu The Clear CAL Data menu in the second page of Manual Calibration clears all the current adjustment parameters and sets them to 0 However unless you push the Save Recall menu button the previous adjustment parameters will be recalled after a power cycle AFG2021 Service Manual 25 Adjustment procedures Reference clock This procedure adjusts the frequency accuracy of the arbitrary function generator Only one frequency point of the output channel is adjusted 1 Connect the arbitrary function generator to the frequency counter as shown in the following figure AFG2021 Frequency counter m uw Bag ees o EE 20 PECES m I 7 Channel output 50 BNC coaxial cable Figure 4 Frequency Period tests 2 Push the following buttons to recall the arbitrary function generator default setup Save Recall gt Setup g
50. rcuit boards by the edges when possible Do not slide the modules over any surface Avoid handling modules in areas that have a floor or work surface covering that is capable of generating a static charge Preventive maintenance consists of visually inspecting and cleaning the arbitrary function generator and using general care when operating it Perform preventive maintenance more often if you operate the arbitrary function generator in a severe environment A good time to perform preventive maintenance is just before adjustment of the arbitrary function generator For optimum performance follow these recommendations Protect the arbitrary function generator from adverse weather conditions The arbitrary function generator is not waterproof Do not store or leave the arbitrary function generator whether the liquid crystal display LCD will be exposed to direct sunlight or high humidity for long periods of time The front and rear cases help keep dust out of the arbitrary function generator and must be in place during normal operation To avoid damage to the arbitrary function generator do not expose them to any sprays liquids or solvents AFG2021 Service Manual Maintenance Inspection and cleaning This section describes how to inspect for dirt and damage and how to clean the exterior and interior of the arbitrary function generator Inspection and cleaning are done as preventive maintenance Preventive maintenance when do
51. s Wypall Medium Duty Wipes 05701 available from Kimberly Clark Corporation 2 Ifthe display is very dirty moisten the wipe with distilled water or a 75 isopropyl alcohol solution and gently rub the display surface Avoid using excess force or you may damage the plastic display surface CAUTION To prevent getting moisture inside the arbitrary function generator during external cleaning use only enough liquid to dampen the cloth or applicator 34 AFG2021 Service Manual Maintenance Interior inspection Inspect and clean the interior if it appears that the arbitrary function generator may have been damaged or exposed to an unusually dirty environment To access the inside of the arbitrary function generator for inspection and cleaning refer to the removal and installation procedures See page 37 Removal and installation procedures Inspect the internal portions of the AFG2021 Arbitrary Function Generator for damage and wear using the check list below as a guide Defects should be repaired immediately CAUTION prevent damage from electrical arcing ensure that circuit boards and components are dry before applying power to the arbitrary function generator Table 3 Internal inspection check list Item Inspect for Repair action Front and rear case Cracks or deformations Repair or replace defective Scratched lettering or display hardware filter Loose connectors or labels Circuit boards Loose broken or corr
52. ssis from the main chassis Installation To install the front chassis perform the removal procedure in reverse order Be aware of the following AFG2021 Service Manual Check that the EMI clip for the USB port is correctly installed See Figure 17 Correctly orient the plastic BNC insulator on each BNC before you install the front chassis See Figure 18 Use the torque limiting screwdriver to tighten the four front chassis retaining screws to 0 49 N m Put the BNC washers on before the nuts and then use the torque wrench to tighten the three BNC nuts to 1 38 N m Correctly orient the power button on the shaft See Figure 19 49 Removal and installation procedures 50 0586 026 Figure 17 Correct position of the EMI clip for the USB port is 4 gt Orient insulator so that the lip is facing out Figure 18 Correct orientation of BNC insulator 0586 019 Figure 19 Correct orientation of power button AFG2021 Service Manual Removal and installation procedures Power Supply module removal installation Required equipment You will need a torque limiting Torx T8 and T15 screwdriver for this procedure Removal To remove the Power Supply module perform the following steps 1 Remove the case See page 40 Case removal installation 2 Disconnect the three power supply cables from the Main board two at the front and two at the rear of the Main board 3 Remove the four retain
53. t Recall gt Default 3 Set up the arbitrary function generator as follows a Push the Sine button on the front panel b Push the Frequency Period Phase Menu bezel button c Push the Frequency bezel button it will turn dark when activated and use the numeric keypad or general purpose knob to set the frequency to 1 000000 MHz d Push the t button on the front panel to return to the top menu e Push the Amplitude Level Menu bezel button f Push the Amplitude bezel button it will turn dark when activated and use the numeric keypad or general purpose knob to set the amplitude to 1 000 Vp p g Check that the Channel On Off front panel button LED is lit If it is not lit then the channel output is off Push the Channel On Off button to turn it on 4 Check that reading of the Frequency Counter is between 0 999999 MHz and 1 000001 MHz 5 Push the Pulse button on the front panel 26 AFG2021 Service Manual Flatness adjustment AFG2021 Service Manual Adjustment procedures 6 Adjust the Ref Clock value with the front panel rotary knob on the generator so that the frequency counter reading is between 0 999999 MHz and 1 000001 MHz 7 Push the Save Recall button on the front panel 8 Push the Save bezel button to save the adjusted value To obtain the flatness of sine waveform relative to the 100 kHz sine waveform compensate the output level of the sine waveform at 5 MHz interval with the power meter 1 Connect
54. t for three years from date of purchase The warranty appears at the front of this manual Tektronix technicians provide warranty service at most Tektronix service locations Tektronix supports repair to the replaceable part and module level Contact your local Tektronix service center or sales engineer for more information on any repair or adjustment service Performance verification procedures The performance check is provided in the 4FG2021 Specifications and Performance Verification Technical Reference manual should be performed every 12 months In addition a performance check is recommended after module replacement If the AFG2021 does not meet the performance criteria repair is necessary AFG2021 Service Manual Operating basics General features AFG2021 Service Manual This section provides installation and operating information that is necessary for service The AFG2021 Arbitrary Function Generator offers the functionality of three generators in one 20 MHz Function Generator 10 MHz Pulse Generator B 14 bits Arbitrary Waveform Generator The following table describes some of the general features of your instrument Feature Description Channel 1 Sine 20 MHz Pulse 10 MHz Memory 128K 14bit Sampling Rate 250 MS s Amplitude 10 Vp p Display Color TFT LCD Interface USB GPIB AFG2021with option GL only LAN AFG2021with option GL only Synchronous operation Available
55. t number Signal interconnection 2 required connector 91 cm 012 0482 00 5 BNC terminator 50 9 19 2 W DC to 1 GHz Tektronix part number Signal termination BNC 011 0049 02 6 Adapter dual banana Plug BNC female to dual banana Tektronix part number Signal interconnection to a 103 0090 00 DMM 24 AFG2021 Service Manual Adjustment procedures Performance conditions The adjustments in this section are an extensive valid confirmation of performance and functionality when the following requirements are met The cabinet covers must be on the instrument m The instrument must have been calibrated adjusted at an ambient temperature between 20 and 30 m The instrument must have a warm up period of at least 20 minutes Enable the Service mode You must enable the service mode to perform the adjustment procedure Do the following steps to enter the service mode 1 Push the power button to power on the arbitrary function generator 2 After the beep push the front panel Recall button and then push the front panel 7 numeric button 3 Keep pushing these buttons until the power on screen is displayed 4 Release the buttons when the top screen is displayed 5 Check whether the service mode is available by pushing the Utility gt more gt more buttons The Service Menu selection is displayed in the third page of the Utility menu Save Recall menu You can adjust the Reference Clock and Flatness pa
56. t with the cable and will lift approximately 2 mm to release the cable 0586 017 Pivot latch up to release Figure 14 Disconnecting the LCD display cable Installation To install the Front Panel board perform the removal procedure in reverse order Be aware of the following CAUTION To prevent damage to the LCD display cable carefully roll the cable behind the Front Panel board during assembly Do not fold or create pressure on the cable Use the torque limiting screwdriver to tighten each of the retaining screws to 0 49 N m The blue lines on the ribbon cable between the Front Panel board and the Main board will align with the locked connector when the cable has been properly inserted into the connector housing 46 AFG2021 Service Manual Removal and installation procedures Front BNC Insulator board removal installation AFG2021 Service Manual Required equipment You will need a 16 mm 5 8 inch deep socket with wide center hole torque wrench and torque limiting Torx T8 screwdriver for this procedure Removal To remove the Front BNC Insulator board perform the following steps 1 Remove the front panel cover See page 42 Front panel cover removal installation 2 Use the torque wrench with a 16 mm 5 8 inch deep socket with wide center hole to remove the nut and washer from each of the three BNC connectors 3 Use ascrewdriver with Torx T8 tip to remove the two retaining screws on the Front B
57. tation is present Disconnect power To avoid electric shock disconnect the mains power by means of the power cord or if provided the power switch Use care when servicing with power on Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections Service safety summary 2 AFG2021 Service Manual Preface Manual contents Manual conventions Modules AFG2021 Service Manual This manual provides instructions to calibrate troubleshoot and repair the AFG2021 Arbitrary Function Generator to the module level The manual consists of the following sections Operating Information includes general information and operating instructions m Theory of Operation contains circuit descriptions that support service to the module level Adjustment Procedures contains information that you need to manually adjust the Arbitrary Function generator so that it meets specifications Maintenance contains information and procedures for performing preventive and corrective maintenance of the Arbitrary Function generator These instructions include cleaning module removal and installation and fault isolation to the module m Diagrams contains interconnection diagrams Replaceable Parts List includes a table of all replaceable modul
58. th probe Tektronix TDS1000 or TDS2000 series oscilloscope Troubleshooting tree To isolate a problem to a specific troubleshooting procedure use the following troubleshooting tree The tree makes use of internal diagnostic routines to speed fault isolation to a module WARNING To prevent electrical shock do not touch the heat sink of the Power Supply module There are potentially dangerous voltages present on the heat sink of the Power Supply module AFG2021 Service Manual 61 Troubleshooting Platform troubleshoot start Remove the rear cover upper chassis Turn on power Check DC output voltages of power supply at connector on the main board Good voltage No Yes No Does the fan operate Yes Are front panel keys No active Yes ls the LCD display No no problem Yes No LAN function normally Yes Replace the power supply Replace the Fan ls the LSD display OK Yes Replace the front panel board Replace the main board Replace the main board No Replace the main board Figure 29 Troubleshooting tree 62 Execute the Utility gt Diagnostics Yes Replace the main board Diagnos Yes Execute the Utility gt Calibration Yes Replace the main board Calibration OK Does the Trigger Input Output function 2 Completed a check 0586 003 AFG2021 Service M
59. the Replaceable parts section for a list of all the replaceable modules and diagrams showing their location in the instrument See page 69 WARNING Only qualified personnel should perform service procedures Before doing this or any other procedure in this manual read the General Safety Summary and Service Safety Summary found at beginning of this manual Always disconnect the power cord before disassembling any portion of the arbitrary function generator To prevent damage to electrical components follow the instructions for preventing ESD See page 31 Preventing ESD The following subsections are included B After repair adjustments Describes when to perform the adjustment procedures after a repair m Before disassembly Describes what you should do before you disassemble the instrument m Equipment required for disassembly Lists the equipment required to remove and install modules B Order of disassembly Provides a diagram showing the proper order in which to remove and install modules amp Removal procedures for each of the replaceable modules NOTE If you are disassembling the arbitrary function generator for cleaning refer to the inspection and cleaning instructions See page 33 Inspection and cleaning AFG2021 Service Manual 37 Removal and installation procedures After repair adjustments After the removal and replacement of a module due to electrical failure perform the a
60. the procedures necessary to manually adjust the AFG2021 Arbitrary Function Generator Perform each adjustment when you exchange a circuit board Purpose of adjustments This procedure returns the arbitrary function generator to compliance with its Warranted Characteristics as listed in the Specification section It can also be used to optimize the performance of the arbitrary function generator Adjustment interval Generally these adjustments should be performed every 12 months After repair adjustments After the removal and replacement of a module due to electrical failure perform the following two adjustments as described in this section m Reference clock Flatness AFG2021 Service Manual 23 Adjustment procedures Equipment required Table 1 Test equipment The following table lists the equipment that is required to complete the adjustment procedures Recommended Description Minimum requirements equipment Purpose 1 Power meter 100 kHz to 250 MHz R amp S NRVS Measures voltage Used in 1 uW to 100 mW 30 dBm to multiple procedures 20 dBm Accuracy 0 02 dB Resolution 0 01 dB 2 Power head 100 kHz to 250 MHz R amp S NRV Z5 Measures voltage Used in 1 W to 100 mW 30 dBm to multiple procedures 20 dBm 3 Frequency counter 50 kHz to 5 GHz Tektronix FCA3100 or Checks clock frequency Accuracy 0 01ppm equivalent Phase measurement 4 BNC coaxial cable 50 male to male BNC Tektronix par
61. to 86 F and allow a 20 minute warm up period Execute Diagnostics Push this bezel button to execute the instrument diagnostics Execute Calibrations Push this bezel button to execute self calibration 5 the diagnostics or calibration completes without any errors the message PASSED is displayed AFG2021 Version 1 1 7 April 15 2012 www tektronix com Protect your instrument from misuse Check input and output When connecting a cable be sure to distinguish the input connector from the connectors output connectors to avoid making the wrong connection NOTE The instrument input and output connectors are floating inputs outputs See page 13 Floating ground AFG2021 Service Manual 11 Operating basics 12 Use fuse adapter 1 Locate the Channel Output and the Trigger Output connectors on the front panel 2 Locate the Trigger Input on the front panel 3 Locate the Ext Mod Input and the Ext Ref Input connectors on the rear panel 2926 011 WARNING To avoid personal injury due to electric shock do not apply voltages in excess of 42 Vpk to any BNC connector ground or to the chassis ground CAUTION Do not short output pins or apply external voltages to Output connectors The instrument may be damaged CAUTION Do not apply excessive inputs over 5 V to Trigger Input connector The instrument may be damaged The instru
62. trument The liquid crystal controller and the USB circuit are included in the MPU Local regulators This regulator stabilizes and supplies 3 3 V and 5 0 V for the logic circuit Remote interface This section contains a GPIB and LAN driver circuit Fan controller This circuit controls the speed of the fan Primary circuit Contains the power switch and the filter circuit Signal I O circuit The Reference Clock Input Output and the Modulation Input signals are transmitted to the Generator section through this section Isolator Transmit the serial control signal from the CPU section to the following circuits with electrical insulation Clock circuit Generates a 1 GHz high speed clock necessary for the signal generation from a 10 MHz reference clock by PLL This circuit has a function of selecting the reference signal source as well GoC ASIC GoC Generator on Chip ASIC is a CMOS waveform synthesis which includes 2 GS s DA Direct Digital Synthesis waveform SRAM 128 K x8 MUX Modulation Burst and Sweep So GoC manages most of the generator section Trigger circuit Receives an External Trigger input signal executes the level conversion then supplies the level converted trigger signal to the GoC ASIC Pre Amplifier circuit Converts the differential output signal of the GoC to single ended output then supplies the single ended output to the Output Amplifier through the Attenuator Output amplifier The output of the pr
63. tting the MAC address 30 The MAC Address is set at the factory and usually does not need to be reset When new MAC address setup is required perform the following procedure 1 Enable the Service mode See page 25 Enable the Service mode 2 Push the Utility gt more gt more buttons 3 Push the Service Menu gt Factory Initialize gt MAC Address buttons 4 Enter the MAC address using the numeric keys and Function buttons NOTE Use the Function buttons to enter alphabetical characters The Sine to More button corresponds to A through Use the key to enter hyphens 5 Push the OK button AFG2021 Service Manual Maintenance This section contains the information needed to do periodic and corrective maintenance on the arbitrary function generator The following subsections are included Preparation Tells you how to get ready to do arbitrary function generator maintenance m Preventing ESD Provides general information on preventing damage to internal modules when doing maintenance B Inspection and Cleaning Information and procedures for inspecting the arbitrary function generator and cleaning its external and internal modules m Removal and Installation Procedures Procedures for the removal of defective modules and replacement of new or repaired modules m Troubleshooting Information for isolating failed modules Included are instructions for operating the internal diagnosti
64. wing manual diagnostics and or self calibration using the Utility menu NOTE Disconnect all the cables from the instrument before performing a self test or a self calibration Diagnostics Self test Perform the self test to verify that your instrument is operating correctly m Calibration Self calibration The self calibration mainly checks DC accuracy using the internal calibration routines Perform at least once a year to maintain DC accuracy It is recommended that the self calibration should be performed along with a periodic check NOTE Ifyou need to verify that the instrument meets the warranted specifications do the complete set of performance verification procedures provided in the Specifications and Performance Verification manual CAUTION Do not power off the instrument while executing self calibration If the power is turned off during self calibration data stored in the internal memory may be lost 10 AFG2021 Service Manual Operating basics 1 Push the front panel Utility button Utility rond 6 2 Push the more bezel em Backup button i 3 Push the Channel Copy Diagnostics Calibration bezel button 2926 006 4 Doone ofthe following Execut NOTE Before executing 525 self calibration ensure that i the ambient temperature is Calibration between 20 C and 30 C Calibration 68 F
65. yed in this area 6 Output status If the output is set to disable Output Off message is displayed in this area When you push the front panel channel output button to enable the output the message will disappear AFG2021 Service Manual Operating basics Rear panel The following illustration shows the rear panel connectors for the instrument 2906 054 Item Description 1 Power input This is where you attached an appropriate power cord to supply power to the instrument 2 Chassis ground screw This screw is used to ground the instrument Use a unified coarse screw 86 32 6 35 mm length or less 3 LAN port This port can be used to connect the instrument to a network Connect a 10BASE T or 100BASE T cable here NOTE This port is only available for the AFG2021 with option GL 4 USB type B connector This can be used to connect a USB type B controller 5 GPIB This is port can be used to control the instrument through GPIB commands NOTE This port is only available for the AFG2021 with option GL 6 EXT REF INPUT connector This is a BNC connector for the external reference input 7 EXT MODULATION INPUT connector This is BNC connector for the external modulation input It can be used to input a modulated signals 8 Security slot This slot allows you to use a standard lapt

AFG2021 Arbitrary Function Generator Service Manual

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