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Tektronix 11801B User's Manual

1. 0 00 ccc eee een eases ewann touch identily Channel serieren tote Hort PPAR touch Select Enter Desc oss adios rr reda cena ee era touch 4 34 Performance Verification Performance Tests as C Step 5 Engage high precision calibration mode as follows URUT DURON uuo an ete a a bee ewe aed a iot edu press Page to Enhanced Accuracy Lee ee ee ee ee ee touch Time Base Cai Mode in major menu touch High Prec in pop up menu 0 2 cee touch Exit an pop up MENU queues SouiuE OS ebbe E PUR Y n touch Sweep Rate Accuracy 2 ns div LU Step 6 Adjust the Sweep Rate to 2 ns div Horizontali COn iau Laco i oo eR c a d De SCR oko Soc C C Pa Ge touch Set Main Size to 2 ns div usuuu adjust upper knob C Step 7 Adjust the Signal Generator to the following settings PreGUeney PET E 55 MHZ BMO A MR M PEL 1 0 Vnus Check that selected Sampling Head channel 1 indicator is flash ing If not select channel 1 by pressing select button LU Step 8 Turn mainframe averaging on WAVEFORM DURON s iie aho Roe R9 OECRER EN IRE Sete es press Acquire Desc in major menu 06 ec eae touch Average N On in pop up menu 2 eee touch Select Exit in the pop up menu eeeeeeeeeeenee ee touch NOTE Position the display so the sine wave is centered on the screen To ensure accurate period measurement the display must be a full cycle 7 Step 9 Obtain Period as follows MEASU
2. H H Ay LE i r i i i i i i 5a ac 1 JE i i H eL ST3 ST4 MSB STi LSB ST2 6 101 Status LEDs Figure 6 35 A5 Time Base Controller Board Status LEDs 11801B Service Manual Diagnostic Troubleshooting Acquisition Processor Error Index Codes Error codes for the Acquisition Processor are listed in Table 6 16 The error index code bits of the first Acquisition kernel test that faiis are read from the A25 A28 Acquisition MPU board status LEDs DS101 MSB and DS100 LSB See Figure 6 36 for the location of these status LEDs The patterns from the status LEDs are applicable only when the Acquisition Is executing or stopped in Kerne diagnostics Table 6 16 Acquisition Processor Kernel Error Index Codes Error Indexnex Suspect Hybrid Suspect Board FRUs IC FRUs 1 FW ACQMPU ACQMPU 3 ACQMPU TBC STRO BEDR MFACQCON Status LEDs DS100 LSB DS101 MSB Oo ee Nee teeeeeteee Figure 6 36 A25 A28 Acquisition MPU Board Status LEDs 6 102 Maintenance Power Supply Module A4 Regulator Board 11801B Service Manual Other Troubleshooting This section provides additional information and procedures for trouble shooting a faulty oscilloscope to the FRU level This procedure requires an Extended Diagnostics power supplies trouble shooting fixture Refer to Table 4 2 for a complete description of the equip ment required Module Troubleshooting l any Power Supply module prob
3. J34 Strobe Deskew Voltages Deskew gn we Sampling Strobe Signais J18 J28 J38 J48 TDR Buffer and Level Shift A1 MF Strobe 7 Drive Board Differential TDR Signal J33A J33B TDR Drive Signals J1C J2C J3C J4C Figure 9 13 A19 Strobe TDR Buffer Board Block Diagram Precision Voltage Beference Power RE foo T3 Figure 9 14 A26 M F Acquisition Interconnect Board Block Diagram 11801B Service Manual Sampling Head Compartments 9 17 Block Diagrams 14 Bit 2 1V to 2 1V 12 Bit Ov to 3V Signal X Variable Sampling input Buffer 1V to 1V a aiit se Head b wy OV Center Scale inputs gt Vin Input je 0 9 Y be XU KE Multiplexer X2 X20 Multiplier 1V REF Vet 2VCAL Gain x0 5 to x5 AVBEE A Vib Vrm 16mV CAL NE ES www V DAC end 8 Bit 500mV to 4 500mV mam Transition p 16 Bit DOT Comparator ha Logic Number Level DAC 4 ase Comparator dd 14 Bit 2 1V to 2 1V Figure 9 15 A24 A27 Acquisition Analog Board Block Diagram Shared Time Base RAD LY Converter Tripl To From Por AD Controller damen Time Base ort Interface i Controller RAM From Comparator RT Channel A Filter and Transition Counter Sampling Head Control Filter and Transition From Comparator Counter Channel B Microprocessor To A D Convert
4. 0 00 0 0 ee ee ea ana touch initialize in verification pop up menu touch 5 20 Adjustment Procedures 11801B Service Manual Adjustments C Step 2 Perform the following operations in the order given w Setthe front panel ON STANDBY switch to STANDBY u Remove the L bracket on the front of the card cage m Remove both plastic retaining strips from the top of card cage m Remove the A17 Main Processor board and then install it in the fourth slot from the outer edge m Remove the A29 Memory Expansion board and then instail it in the third slot m Remove the A14 Input Output I O board and then install it in second slot a Move the A18 Memory board from the first slot to the fifth siot m Reconnect all the cables to the A14 I O board a Set the oscilloscope front panel ON STANDBY switch to ON L Step 3 Connect the Frequency Counter as indicated in the setup diagram see also Figure 5 6 and set the controls as follows Frequency counter js PEE Period HOGG weet E E EN A iq bI pdt ds ere rede ura dtt DC ala TTD negative Time Sas B geser anea AA A E EAA a EA Ae 1 MHz Step 4 Make the following oscilloscope selections GELT DURON eaae eO Oe mm foem dedi cies o Dee o E a press Page to Enhanced Accuracy in major menu touch Page to Utility2 in major menu 0 000022 touch Extended Diagnostics in major menu touch Extended Diagnostics
5. A15 MMU Board A17 Executive Processor Board A18 Memory Board Checks Required Power On Diagnostics Extended Diagnostics Internal Clock Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power Supply Vertical Reference Voltage Vertical Accuracy System Vertical RMS Noise oweep Rate Accuracy Triggering Power On Diagnostics Extended Diagnostics Display Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Real Time Clock Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics 6 77 Corrective Maintenance 6 78 Table 6 4 Checks Required After FRU Replacement Cont FRU Replacement A19 Strobe TDR Buffer Board A20 A23 Head Interconnect Boards A26 M F Acquisition Interconnect Board A24 A27 Acquisition Analog Boards A25 A28 Acquisition MPU Boards Firmware ICs Cathode Ray Tube CRT Power Supply Module Checks Required Power On Diagnostics Extended Diagnostics Sweep Rate Accuracy Internal Clock Power On Diagnostics Vertical Accuracy System Vertical RMS Noise Power On Diagnostics Extended Diagnostics Vertical Reference Voltage Power On Diagno
6. Ramp Tone This test verifies the capability of the instrument to gener ate tones through its internal speaker This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the Loop mode set to On and the Terse and All mode set to Off After invoking this test you should verify that a high speed clicking sound occurs Real Time Cik Calibrate This test allows you to check and adjust the Real Time Clock period This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the All and Loop modes set to Off Once this test is invoked you can examine adjust the real time clock period following the procedure outlined in the Real Time Clock procedure in the Adjustments section External I O Printer Pattern This test prints a set of patterns all printable ASCII char acters to help you verify the external printer interface This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the Ail mode set to Off Before executing this test you should connect a Centronics compatible printer to the PRINTER port on the rear panel of the instrument RS 232 Extern Loop This test verifies parts of the external RS 232 C interface This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the All mode set to Off Before executing this test you should plug an external loopback connect
7. Strobe Deskew t S AR Ws X AR 0A 0X AR Y03 C G8 i Go C 4 bo ROM boR OR OS G Y oYX d v t TDR Buffer and Level Shift 00 00 00 cece cece ee ee A20 23 Head Interconnect Boards 00 cece eee eee A26 M F Acquisition Interconnect Board A24 A27 amp A25 A28 Acquisition System Boards Programmable Gain Amplifiers llle A D Convertors E 8 B 839 Go on do AS 9 k 9 BO OW 33 3 C03 34 985 O98 BA ok o amp Var o8 Measurement Hardware 0 0 020 eee Timing and Sampling Head Control 0008 Shared RAM ok B s hs 9 oh B 3 Bo we 4 mo eH eH eH HY 3 b o o3 K 4 Time Base Controller Interface elles Microprocessor BOB 8 8 8 4 X 4 ow boo 4 bo Oe o3 4 Y NN om b Ga 4d ko b MOS GSR ob Y 3 20 3 20 3 20 3 20 3 21 3 21 3 21 3 21 3 21 3 22 3 22 3 22 3 22 3 23 3 23 3 23 3 23 3 23 3 23 3 24 3 24 3 24 3 25 3 25 3 25 3 25 3 25 3 25 3 26 3 26 3 26 3 26 3 26 3 27 3 27 3 27 3 28 3 28 3 28 3 29 3 29 3 29 Adjustment v am erformance Verification Performance Verification 00 0 ccc ee ce eee ee nnn hane Test EQUIDNIGHE Lucus kara cioe Ear e p RI CEN SC o e Dex TOST a aol L ausser eite as E NUS dubiae drains Using These Procedures nr nnn Conventions in this Manual sci sed
8. nostics code for the EXP All the memories share the latched address bus The SRAM stores miscellaneous constants that the operating system code uses and produces The NVRAM contains stored settings stored traces and other nonvolatile parameters The memories are organized into high and low byte pairs The address decode PAL generates latched chip select signals A separate latched chip select signal selects each of these pair The memory data buffers buffer the data lines to the Executive data bus Memory Data Buffers These ICs drive data between the memories and Executive data bus Both eight bit buffers are enabled when all of their inputs are high Wait State Generator This circuit aliows the EXP to access memory devices when the EXP is operating at faster clock frequencies When the EXP is operating at frequen cies greater than 8 MHz the bus cycle time is too short to allow reads or writes to the present memory devices The wait state generator sets the SRDY line see Figure 9 11 on the Executive bus low to signal the EXP to iengthen the bus cycles The wait state generator also contains a circuit to generate control signals similar to those on the Executive bus These control signals are early address latch ELATCH early memory write control EMWTC and early memory read contro EMRDC Wait State Diagnostics This firmware routine measures the time interval that the wait state generator generates when a one 1 is writt
9. 10 at 1 ps div Triggering yes 300 MHz Sensitivity 100 mV p at 300 MHz 100 mV stable none display 1000 MHz Sensitivity 100 MVp p at 1000 MHz 100 mV stable none display 3 0 GHz Sensitivity 100 mV at 3 0 GHz 100 mV stable none display internal Clock yes Rise Time 2 5 ns 2 5 ns none Frequency 100 kHz 3 100 kHz 3 none Duty Cycle 5096 3 396 5096 3 none Calibrator Output yes Rise Time 250 ps 20 80 250 ps none 20 80 pn Hs MH Q wP M MtM M M t t QM M nt Po Y 7 SQQ AAE EM RR ODE MEME MM MEME MM MEA MEME LE E Peak to peak Amplitude 250 mV 10 250 mV 10 none Wena a A GR ARR ZU DA QE DUM HM CUM NOH M MH MA ME C NV UH TUN M POR UMMOPt MODUM UHIDUPLMM M MM MM UM ama amas 11801B Service Manual 1 3 Specifications Specifications 11801B Service Manual Operating Information The 11801B Digital Sampling Oscilloscope Service Manual is designed for use by qualified service personnel It contains information necessary to check troubleshoot and maintain the 11801B Digital Sampling Oscilio Scope Troubleshooting is primarily based upon internal power on diagnostics These diagnostics isolate problems to the field replaceable unit FRU level Defective FRUs not detected by diagnostics are isolated using other means Once the faulty FRU is identified use the instru
10. 1151 00 8 CLAMPRIM CLENC SPG STL 83553 ORDER BY DESC 17 200 3415 00 1 COV CAB LIFTOFF LOWER AL BLUE PAINT 80009 200341500 18 200 3759 00 1 COVER CABINETTORLIFT OFF 0J260 ORDER BY DESC 10 8 Mechanical Parts List Replaceable Parts Figure 10 1 Cabinet 11801B Service Manual 10 9 Replaceabie Parts Fig amp Index No TO 21 eis 14 15 16 si 18 19 20 m 22 29 24 25 26 27 28 29 30 31 82 33 34 35 36 10 10 Tektronix Part No 614 0916 00 386 5806 00 mhasan naait Lir aantas Lu Mis uirre Airs 366 0600 01 211 0372 00 211 0722 00 386 5268 07 211 0721 00 381 0469 00 2110 1100 131 1688 00 154 0946 00 210 0006 00 211 0718 00 311 2320 00 671 1130 006 348 1075 00 211 0410 00 260 2275 00 343 0549 00 333 3418 00 150 0121 13 174 0616 00 210 0586 00 348 1076 00 210 0465 00 210 0223 01 210 0255 00 315 0105 00 103 0268 00 348 0878 00 333 3908 01 210 0895 00 136 01460 00 220 0052 00 384 1682 02 366 0600 00 131 4763 00 211 0711 00 Serial No Effective Dscont Qty wh wh Aa B NI whe Aa NJ e E SS na k M 53 whe wh IS AS AO e 2 12345 Name amp Description FRONT PANEL SUBPANEL ASSY 11801B SEE A9 EXCHANGE ITEM FRAME LENS TOUCH PAN
11. 11801B Service Manual Block Diagrams GPIB Reg DO0 DO7 Bor GPIE Gr i Control BPD0 D7 y GPIB T6 i Buffer J78 RPA1 A4 Controller Control TE 450 poem Control Si bee ontro Signa GPIB Clk Buffer RP Reset 4 LEDA 3P IB Interface RS 232 C Transceiver RPA1 A4 Standard Buffer Standard RS R9232 all BM Controlier RS 232 C 1 Transceiver Ff Buffer Reset A Standard RS 232 C interface Clock Hi Generator T RPDO D7 RPA1 A4 RPAT A4 Printer Printer Select _ Controller J111 x Bufer eres Printer Interface Figure 9 8 A12 Rear Panel Assembly Block Diagram 9 13 Block Diagrams J72 Temp Tone Tone Readback Generator Data Buffer Address Buffer P105 478 Executive Delayed to Rear Data Bus Data Panel Buffer Control Buffer Je Controi Configuration Data Buffer Address Buffer J72 BON to Froni Panel Clock SDI Control Control Generator Buffer I Control Figure 9 9 A14 I O Board Block Diagram To From A5 Time Base Controller Time Base Controller interface Microprocessor To From A17 EXP Display Executive Interface MMUIC interface Display IC Processor VIDEO Video DAC Waveform Waveform RAM un Display RAM Figure 9 10 A15 MMU Board Block Diagram 9 14 Diagrams Block Diagrams System s sta ee
12. 6 7 6 20 and 6 32 for board connector screw and index locations Remove and replace the A15 MMU board as follows Step 1 Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover Step 2 Remove both of the plastic board guides from the top of the card cage The guides are retained by two small catches located in two holes in the left bracket of the card cage The other ends of the guides contain slots which attach to the edge of a metal bracket Both ends of the guides can be pried loose Step 3 Remove connectors J52 J53 J57 and J83 from the A15 MMU board Note the position of the multi pin connector s index triangies to ensure that you can correctly replace these connectors 7 Step 4 Lift the white hinged tabs at the front and rear edges of the A15 MMU board Pull the tabs upward until the A15 MMU board separates from the A13 Mother board Step 5 Remove the A15 MMU board To replace the A15 MMU board perform the previous steps in the reverse order NOTE insert the board edges into the plastic guides at each end of the card cage Lower the board into position Ensure that connector P101 is seated onto the A13 Mother board connector Push down firmly on the A15 MMU board to seat this connector on the A13 Mother board 11801B Service Manual 6 51 Corrective Maintenance Front of Oscilloscope E P101 To A13 Mother Board Connector Figure 6 20 Rem
13. BV Se osr CIV GONVOG 0992208 BAT LMOAXR Q ev aM aar v an 8AF GHvVoa MSHLOW Dor at e e gv Guvog ACORZF 058 NY 3 r eg Ld T8 ee evev guvog HZIdIli323u OY LNG ignug N 93IAIOS BEOSLLE ONIONS SISSVHJ EA MW IX gral UNAX EA N323HS9 ALAAYS F ONNOWS SISSVYHJ Zen Sel AN ANI Sen as YDA YALRAAN 4i SO 2iiSN9vid tyrr S45 3 vas SON aNVa or a 1N OHd vn MT S dfi eznr esp EZP Gn Gar Block Diagrams Board Level Block Diagrams J35 4MHz gel internal BADO 15 Clock Rate 4 Generator Ea E RE Calibrator Out A t BADO 15 gt J40 interna Data Clock Buffers Dir Out TO Strobe J18 Control TDR Buffers Buffer Board Select 1 IM MEM MZ V I Bcard Seiect 2 I Unit Select Beat Sense s Strobe Sense 1 T S Strobe Sense 2 BADO 7 S Strobe Sense 3 Strobe Sense 4 S Strobe Sense 3 pid Ele Delay EDD as J22B A J15 Delay 2 J34 J22C rua J220 Delay 3 jab el ee ae Delay 4 J Lets Figure 9 3 A1 M F Strobe Drive Board Biock Diagram 11801B Service Manual 9 9 Block Diagrams Power Control ey J60 i j i J65 Over Under Voltage Local Voltage Semi regulated Power i Regulator Fault Detect Power Reference and Operation Amplifier Power 15V F 5V F Regulator w Regulator F Regulat
14. Figure 6 26 Removing Replacing the A26 M F Acquisition Interconnect BOBEC c ca ESEASON PREDA RU REQUE ENS 6 61 Figure 6 28 Removing Replacing the A24 A27 Acquisition Analog BONOS Sto a arden Aor ot e bale eco ne a ifa ba 6 63 Figure 6 32 Muiti Pin Connector Orientation and Semiconductor Indexipnd DIA eti v qn ERO I Ob RKER E RR ERAN EIU 6 74 A25 A28 Acquisition MPU Figure 6 23 Removing Replacing the A19 Strobe TDR Boards Baller BOAT iod soie d a CR UNI proie I SH PRESE RR AR 6 58 Figure 6 26 Removing Replacing the A26 M F Acquisition Ipnt reorinect Board oso sea ea CIE pen ete csl nins tdt 6 61 Figure 6 29 Removing Replacing the A25 A28 Acquisition MPU BOIS mmmmmmmmmimmmmmmmmmmrmmmmmmmm rr r REPE ds 6 64 Figure 6 32 Multi Pin Connector Orientation and Semiconductor Iridexipg DIagEeli 2a hore een e o Re nianna 6 74 Firmware ICs Figure 6 30 FHU K Detal 1t ci edocet wb ca 6 67 Figure 6 32 Multi Pin Connector Orientation and Semiconductor lriciexino DIAGN 3 2 ceca eo ead REA P Cedo RR aS 6 74 Serial Data Interface SDI Figure 6 19 Removing Replacing the A14 I O Board 6 50 IC Figure 6 32 Multi Pin Connector Orientation and Semiconductor Iridexing Dagiai scr 2090 io BR E o bathe etek Re Saco ra 6 74 Figure 6 31 IC Insertion Extraction Tool 00 eeee ee ee e eee 6 69 Fuses Figdure 6 97 FUSE LOCBlOBDS vcs rie deen EA VEA RIGH ee eee cya cus 6 107 118018 Service Manual 6 17 Corrective Maintenance
15. NOTE In addition to the figures listed in Table 6 2 the exploded view drawings in the Parts List section may be helpful in removing or disassembling individual FRUs or subassemblies Also Figures 6 1 and 6 30 are useful for determining the location of FRUs and FRU ICs The top and or bottom covers will need to be removed for most repairs To loosen the cover fasteners use a coin or a straight slot screwdriver with a large sized tip and rotate the cover fasteners a quarter turn counter clockwise Whenever a specific area is mentioned such as the right side it will usuaily be in reference to the front of the instrument l another reference is in tended it will be indicated for exampie viewing from the left side or viewing from the rear of the instrument All connector names are labeled on the circuit board and or on the connec tors themselves WARNING To avoid electric shock hazard and instrument damage always disconnect the oscilloscope from its power source before remov ing or replacing FRUs For sampling head removal or replacement switch the front panel ON STANDBY switch to STANDBY 6 12 Maintenance Electrical Lock on of the Front Panel ON STANDBY Power Switch 11801B Service Manual Corrective Maintenance Some applications of the oscilloscope may require that the power remain on To electrically lock the power on use the following procedure Step 1 Switch the rear panel PRINCIPAL POWER SWITCH t
16. STAMFORD CT 06903 2617 TUALATIN OR 97062 OAKLAND CA 94621 1254 ALOHA OR 97007 3002 AK ROTTERDAM THE NETHERLANDS 5600 PB EINDHOVEN THE NETHERLANDS ROCKVILLE CENTRE NY 11570 TIGARD OR 97223 BERKELEY CA 84710 2215 SALEM OR 97303 SPOKANE WA 99202 HILLSBORO OR 97124 MENTOR OH 44060 PORTLAND OR 97214 3502 BEAVERTON OR 97077 TAIPEI TAIWAN ROC VANCOUVER WA 98601 WESTFIELD PA 16950 VANCOUVER WA 98661 2999 BEAVERTON OR 97076 4200 Mechanical Parts List Mr TER Replaceable Parts CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mfr Manufacturer Address City State Zip Code Code OJ9P9 GEROME MFG CO INC PO BOX 737 NEWBERG ORB 97132 OKBO1 STAUFFER SUPPLY 810 SE SHERMAN PORTLAND OR 97214 OKBOS NORTH STAR NAMEPLATE 1281 85 NE 25TH HILLSBORO OR 97124 00779 AMP INC 2800 FULLING MILL HARRISBURG PA 17105 PO BOX 3608 06915 RICHCO PLASTIC CO 5825 N TRIPP AVE CHICAGO IL 60646 6013 11897 PLASTIGLIDE MFG CORP 2701 W EL SEGUNDO BLVD HAWTHORNE CA 90250 3318 18677 SCANBE MFG CO 3445 FLETCHER AVE EL MONTE CA 81731 DIV OF ZERO CORP 2W944 PAPST MECHATRONIC CORP AQUIDNECK INDUSTRIAL PK NEWPORT Ri 02840 24931 SPECIALTY CONNECTOR CO INC 2100 EARLYWOOD DR FRANKLIN IN 46131 PO BOX 547 28520 HEYCO MOLDED PRODUCTS 750 BOULEVARD KENILWORTH NJ 07033 1721 P O BOX 160 29870 VICTOR CORP 618 MAIN STREET WEST WARWICK RI 02893 30010 BICC VERO ELECTRONICS INC 40 LINDEMAN DR TRUMBULL CT 06611 4739 34649 INTEL CORP 3065
17. Step 9 Wait for averaging to complete Then check that the AMean value is to be within 7 8 mV lower spec and 8 2 mV upper spec NOTE Averaging will complete faster if you exit the measurement menu and then return when averaging is complete Alternatively use the dial to move the Main Size setting two notches higher than the default setting Step 10 Change the polarity of the voltage differential coming from the precision voltage Source Check that the AMean value is between 7 8 mV and 8 2 mV Performance Verification Performance Tests C Step 11 Refer to Table 4 3 and check actual results against the table specifications for the setting levels indicated NOTE Specifications are one percent of full scale at each volts div setting Example at 5 mV div full scale for 10 div is 50 mV which gives an upper and lower spec tolerance of 0 5 mV and 0 5 mV Table 4 3 Voltage Source Settings Sens Source V Lower Spec Upper Spec 5 mV div 20 mV 20 5 mV 19 5 mV 10 mV div 40 mV 41 0 mV 39 0 mV 20 mV div 80 mV 82 mV 78 mV 50 mV div 200 mV 205 mV 195 mV 100 mV div 400 mV 410 mV 390 mV 200 mV div 800 mV 820 mV 780 mV 5 mV div 20 mV 19 5 mV 20 5 mV 10 mV div 40 mV 39 0 mV 41 0 mV 20 mV div 80 mV 78 mV 82 mV 50 mV div 200 mV 195 mV 205 mV 100 mV div 400 mV 390 mV 410 mV 200 mV div 800 mV 780 mV 820 mV NOTE Up to now you have been working with trace 1 Channel 2 an
18. that is if all the other FRUs pass diagnostic testing then you can assume that the A4 Regulator board is operating correctly as well 6 103 Other Troubleshooting CRT A7 CRT Socket Board or A8 CRT Driver Board This procedure requires a test terminal and a compatible RS 232 C serial interface cable Refer to Table 4 2 for a compiete description of the equip ment required Module Troubleshooting If the oscilloscope powers on the ON STANDBY light is on but the display gives either scrambled information or none at all then the CRT and A8 CRT Driver board are suspect The following two procedures help you determine whether the A15 MMU board or one of the CRT units either the CRT the A7 CRT Socket board or the A8 CRT Driver board is at fault With the power off ON STANDBY switch to STANDBY remove the top cover then turn the power on Observe the two LEDs on the A15 MMU board and those on the A17 Executive Processor board in the card cage These LEDs should flicker on and off until the diagnostic tests are complete and then all turn off If any of these LEDs remain lit it indicates a problem with the board on which the LED resides If all LEDs turn off then the CRT A7 CRT Socket board or the A8 CRT Driver board is suspect With the power off connect a test terminal ANSI 3 64 compatible to the oscilloscope with an RS 232 C cable Touch the screen through the full power on cycle to force a diagnostic error so that th
19. with an RS 232 C port Requires compatible RS 232 C serial interface cable Coaxial Cable 50Q 500 36 inch male Tektronix Part 012 0482 00 3 required BNC connectors Coaxial Cable RF RF cable 12 in Tektronix Part 174 1364 00 SMA connectors RF cable 8 5 in Tektronix Part 174 1120 00 SMA connectors Aaa rari P It ora H AHEAD Sr rue rH UI VAM 118018 Service Manual 4 3 Performance Verification Table 4 2 Test Equipment Cont Description Minimum Examples of Applicable Specification Test Equipment Adapters BNC female to male Tektronix Part 103 0090 00 Dual Banana BNC male to female Tektronix Part 103 0035 00 Dual Banana SMA male to BNC Tektronix Part 015 1018 00 female 8 required SMA female to BNC Tektronix Part 013 0126 00 maie SMA maie to N Tektronix Part 015 0369 00 male Power Divider 500 6dB load isolation Tektronix Part 015 1014 00 50 Q SMA connectors Termination 50 Q Impedance 50 Q Tektronix Part 015 1022 00 accuracy within 296 SMA connectors Attenuator 10X 20 dB attenuation Tektronix Part 011 0059 02 50 Q one male and one female Attenuator 2X 50 0 SMA one Tektronix Part 015 1001 00 maie and one female Power Supplies Tektronix 067 1264 00 troubleshooting Extended Diagnostics Fixture 11000 Series Power Supplies troubleshooting fixture Probe 10X Attenuation 10
20. 1 Internal I O ESTIT 1 Temp Sensor ESTIT 1 Comparator E3111 1 Tone Gen Ramp Tone works Note The front panel lights soft keys and hard keys do not work F602 1344 Front Panel Inter OPEN Note The tone generator has a very different tone indicates a Manuali Test forced by the operator The test is not automatically executed by Self Test diagnostics Maintenance Other Troubleshooting aa Fuse F200 Fuse F660 Fuse F602 Fuse F808 ID ey amr mt AAMMI Wr Ma ee ee ee mnn Figure 6 37 A14 VO Board Fuse Locator Diagram 11801B Service Manual 6 107 Other Troubleshooting Time Base Tabie 6 18 lists the time base calibration errors that can appear on the oscilloscope screen and the suspected faulty FRUs that cause the error The Calibration Errors FRUS are listed in the order of most to least likely source of the error Time base calibration error messages with error codes greater than 100 have two different forms depending on when the error occurs If the error occurs during power on then the message will say Time base calibration failed at power up 2XX where 2XX is the error code If the error occurs at any other time then the message will say Time base calibration failed 1XX where 1XX is the error code Calibration data to enhance the time interpolator linearity is stored in NVRAM on the Time Base Controller board If this NVRAM fails a T1331 error occurs d
21. 11801B Service Manual 10 11 Replaceable Parts Fig amp index No I9 d oe eo 24 25 26 27 28 29 80 81 82 83 34 35 36 37 38 10 12 Tektronix Part No 200 3690 01 211 0722 00 407 3438 02 351 0746 00 211 0718 00 351 0746 00 671 0013 00 211 0721 00 129 1085 00 211 0410 00 214 2476 01 214 3106 00 211 0411 00 386 5369 02 255 0334 00 211 0711 00 386 5269 02 386 5283 00 343 0081 00 210 0007 00 174 4406 00 214 4082 00 351 0744 00 610 0750 00 407 4028 00 119 4589 00 348 0532 00 348 0253 00 210 0457 00 343 0040 00 211 0720 00 346 0143 00 108 1462 00 343 0085 00 351 0765 00 386 1559 00 200 3708 00 670 8847 01 407 3840 00 Serial No Effective Dscont PO No mh O OE OD EDO es ce Oty gi MH NH PB MH 0 mo axe side RS n k AS aim PO 12345 Name amp Description CHASSIS REAR COVER HIGH VOLT ALUMINUM SCREW MACHINE 6 32 X 0 25 PNH STL BRACKET CHASSIS ALUMINUM GUIDE CKT BOARD NYLON 6 803 L SCREW MACHINE 8 32 X 0 312 FLH STL GUIDE CKT BOARD NYLON 6 803 L CIRCUIT BD ASSY REAR PANEL SEE A12 EXCHANGE ITEM SCREW MACHINE 6 32 X 0 375 PNH STL SPACER POST 0 25 L 4 40 BRS 0 25 HEX SCR ASSEM WSHR 4 40 X 0 437 PNH STL T10 HOW ASSY KIEB
22. 174 0629 01 174 0630 01 174 0631 01 HW 047 Replaceable Parts 11801B Service Manual 10 21 Replaceable Parts Fig amp Tektronix Serial No Qty 12345 Name amp Description Mfr Mfr Part No index Part No Effective Dscont Code No POWER SUPPLY 10 6 1 620 0022 08 1 POWER SUPPLY 80009 620002208 SEE A2 EXCHANGE ITEM 2 200 2222 00 1 GUARD FAN TK2105 08213 83 211 0744 00 4 SCREW MACHINE 6 32 X 2 0 PNH TORX STI TK0435 ORDER BY DESC om 200 2264 00 1 CAPFUSEHOLDER 3AG FUSES 3629 FEK 031 1666 5 159 0013 00 1 FUSE CARTRIDGE 3AG 6A 250V FAST BLOW 75915 312006 F99 USED IN FUSE HOLDER 159 0021 00 1 FUSE CARTRIDGE 3AG 2A 250V FAST BLOW 71400 AGC 2 F410 PART OF LINE INVERTER BOARD 159 0248 00 1 FUSE WIRE LEAD 1 5 A 71400 TR MCR 1 1 2 F650 PART OF LINE INVERTER BOARD 159 0220 00 1 FUSE WIRE LEAD 3A 125V FAST 61857 SP5 3A F740 PART OF CONTROL RECTIFIER BOARD 6 407 3362 00 1 BRACKET FAN 0 050 5005 H 34 5Y400 ORDER BY DESC 7 204 0832 00 1 BODYFUSEHOLDER 3AG amp 5 X 20MM FUSES 53629 0311673 8 119 1725 01 1 FAN TUBEAXIAL 8 14 5VDC 6W 3200RPM 106CFM 2W944 4112 KX 9 211 0722 00 8 SCREW MACHINE 6 32 X 0 25 PNH STL OKBO1 ORDER BY DESC 10 22 Mechanical Parts List Replaceable Parts Figure 10 6 Power Supply 10 23 11801B Service Manual Replaces Paris Fig amp Tektronix Serial No Qty 12345 Name amp Descr
23. 1762 06 1 COMPONENT KIT 118018 CSA803A FIRMWARE 80009 020176206 10 14 Mechanical Parts List Tektronix Part No Serial No Effective Dscont Gty 12345 Name amp Description M r Code M r Part No Replaceable Parts Figure 10 4 Circuit Boards 10 15 11801B Service Manual Replaceable Parts Fig amp Tektronix Seriai No Qty 12345 Name amp Description Mfr Mfr Part No index Part No Effective Dscont Code No WIRE ASSEMBLIES SEE MAINT SECTION FOR CABLING DIAGRAM 174 3076 00 1 CA ASSYRFREECOAXIALRFO 50 OHM 0 10 D 6 5 L 80009 174307600 FROM A4J66 TO A2A2J66 174 0563 00 1 CA ASSY SPELEC 8 18 AWG 8 0 L TK1967 ORDER BY DESC FROM A4J64 TO A2A2464 174 0576 00 1 CA ASSY SEELEC 50 28 AWG 10 3 L RIBBON TK1547 ORDER BY DESC FROM A26J10 TO A1410 174 0577 00 1 CA ASSY SRELEC 16 28 AWG 7 5 L RIBBON TK1547 ORDER BY DESC FROM A19J34 TO A1434 174 0580 00 1 CA ASSY SPELEC 50 28 AWG 14 0 L RIBBON TK1547 ORDER BY DESC FROM A18J83 TO A5J83 174 0608 00 1 CABLE ASSY HF 50 OHM COAX 11 0L 9 0 5 TK2469 ORDER BY DESC FROM A1J35 TO AS5J35 174 3076 00 1 CA ASSY RF COAXIAL RFD 50 OHM 0 10 D 6 5 L 80009 174307600 FROM A5J32 TO A19J32 174 0623 00 1 CABLE ASSY HF 50 OHM COAX 6 0 L 9 0 TK2469 ORDER BY DESC FROM A19J30A TO ASJ30B 174 0624 00 1 CABLE ASSY RF 50 OHM COAX 6 0 L 9 N TK2469 ORDER BY DESC FROM A19J29A TO A5J29BD 174 0625 00 1 CABLE ASSY RF 50 OHM
24. 82 mV 50 mV div 195 mV 205 mV 100 mV div 390 mV 410 mV 200 mV div 780 mV 820 mV Vertical Offset Accuracy Second Compartment 2 mV Step 10 400 mV 398 mV 402 mV Step 11 1V 0 998 V 1 002 V 2V 1 998 V 2 002 V 400 mV 402 mV 398 mV iV 1 002 V 0 998 V 2V 2 002 V 1 998 V L ps na AM MM ER STE ESSEC ETE e a ODUMMMESELLLALL LLDeLLIUN ee E TS ih RS ht Vertical Gain Third Compartmen 5 mV div Step 11 10 mV div 20 mV div 50 mV div 100 mV div 200 mV div 20 5 mV 41 0 mV 82 mV 205 mV ATO mV 820 mV 1 2 at checkpoint 19 5 mV 39 0 mV 78 mV 195 mV 390 mV 780 mV Performance Verification Performance Verification ges 11801B Test Record Cont Performance Test Minimum Incoming Outgoing Maximum 5 mV div 19 5 mV 20 5 mV 10 mV div 39 0 mV 41 0 mV 20 mV div 78 mV 82 mV 50 mV div 195 mV 205 mV 100 mV div 390 mV 410 mV 200 mV div 780 mV 820 mV Vertical Offset Accuracy Third Compartment 2 mV Step 10 400 mV 398 mV 402 mV Step 11 1V 0 998 V 1 002 V 2V 1 998 V 2 002 V 400 mV 402 mV 398 mV 1V 1 002 V 0 998 V 2 V 2 002 V 1 998 V Vertical Gain Fourth Compartment t 1 296 at checkpoint Step 11 5 mV div 20 5 mV 19 5 mV 10 mV div 41 0 mV 39 0 mV 20 mV div 82 mV 78 mV 50 mV div 205 mV 195 mV 100 mV div 410 mV 390 mV 200 mV div 820 mV 780 mV 5 mV div 19 5 mV 20 5 mV 10 mV di
25. A4 EXCHANGE ITEM B 159 0220 00 1 FUSE WIRE LEAD 3A 125V FAST 61857 SP5 3A F430 G 211 0721 00 SCREW MACHINE 6 32 X 0 375 PNH STL OKBO1 ORDER BY DESC 10 211 0408 00 SCR ASSEM WSHR 4 40 X0 250 PNH STL T10 93907 829 06815 024 11 670 9640 00 1 CIRCUIT BOARD M F POWER CONNECT 800098 670964000 SEE A3 EXCHANGE ITEM 12 211 0711 00 19 SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 OKBO1 ORDER BY DESC 13 670 9365 05 1 CIRCUIT BD ASSY M F STROBE DRIVER 80009 670936505 SEE A1 EXCHANGE ITEM 14 671 2931 00 1 CIRCUIT BD ASSY TIMEBASE CONTROLLER 80009 671293100 SEE A5 EXCHANGE ITEM 671 2929 00 1 CIRCUIT BD ASSY TIMEBASE IM OPT 80009 671292900 SEE A5 OPT 10 EXCHANGE ITEM 15 672 1372 01 1 CIRCUIT BD ASSY CRT DRIVER 80009 672137201 SEE A8 EXCHANGE ITEM 16 159 0235 00 1 FUSE WIRE LEAD 0 75A 125V FAST 71400 TR MCR 3 4 F330 17 407 3824 00 1 BRACKET SUPPORT HY XFMRBR 0 062 AL 5Y400 ORDER BY DESC 18 213 0892 00 1 SCHREW TPG TF 4 24 X 0 375 PNH STL 93907 B80 70000 003 19 671 1023 02 1 CIRCUIT BD ASSY MEMORY MANAGEMENT UNIT 80009 671102302 SEE A15 EXCHANGE ITEM 20 670 8854 02 1 CIRCUIT BD ASSY INPUT OUTPUT 80009 670885402 SEE 14 EXCHANGE ITEM 21 671 1890 00 1 CIRCUIT BD ASSY MEMORY 80009 671189000 SEE A18 EXCHANGE ITEM 22 671 2888 009 1 CIRCUIT BD ASSY EXECUTIVE PROCESSOR 80009 671288800 SEE A17 EXCHANGE ITEM 020
26. Ce rene touch identify Mainframe ose ER REED dune l dein touch Beni Channel 2 icc oL ene TREE pobre ee E Rd touch Automatic Calibrate in pop up menu 2 6 ee touch 11801B Service Manual 4 17 Performance Tests 4 18 LJ Step 3 Perform the Loop Gain calibration as follows Connect the CALIBRATOR output to the sampling head input to be calibrated 2 Select Proceed in the Loop Gain pop up menu touch Store Constants in pop up menu seesss touch Step 4 Set up second Automatic Calibration as follows Disconnect the calibration cable from the sampling head input Offset in maior menu iva era a er Ra ER Y SUE touch Automatic Calibrate in pop up menu 2 touch Step 5 Perform the Offset Null calibration as follows Connect a 50 Q termination to the sampling head input Select Proceed in pop up menu 2 0 00 eee touch Store Constants in pop up menu 005 touch EXE T DOU MERN eus atus aon Rocio b de a ao oett touch G Step 6 Repeat Steps 1 through 5 for all sampling head compartments and channels being tested Performance Verification Extended Diagnostics Performance Tests The Extended Diagnostics perform more extensive testing than the Self Test diagnostics They can be used to assist troubleshooting particularly in service environments Setup to Invoke Extended Diagnostics Sede k LLLLLE l the os
27. Front Panel boards the A12 Rear Panel assembly and on board I O devices The EXP reads and writes to these I O devices at specific I O addresses These I O addresses are de coded to produce device select signals which enable the addressed device Each I O device is located on I O address boundaries of at least 1004 The lower eight bits of the Executive data bus transmit data to and from the various I O devices Note that only one I O device can be accessed at a time l O Data Buffer This circuit buffers the lower eight bits of the Executive data bus from P105 The output of the I O data bus drives data to the following six on board devices m O delayed data buffer m Rear panel data buffer m Front panel data buffer Tone generator m Tone temp readback buffer amp Timer configuration circuitry I O Delayed Data Buffer This circuitry interfaces between the I O data bus and the Write Delayed data bus Timer Configuration This circuitry is composed of a latch and three two input data multiplexers built with discrete gates When a byte of data on the I O data bus is latched some of the data bits individually configure counters 1 and 2 allowing the Theory of Operation 11801B Service Manual Block Diagram Descriptions timer to accept different inputs for different system tasks The operating system uses counter 0 as a real time clock based on the 2 MHz CLK input from the clock generator which is always ope
28. HEAD SNAP IN TK1163 ORDER BY DESC 1 0 26 Mechanical Parts List Heplaconhie Hans Figure 10 8 Accessories 11801B Service Manua Replaceable Paris IT TTR AEN A ah ate TAI inn roro ra Perd A ce CS Ca wT NC T ICI TPC an 10 28 Mechanical Parts List
29. NH M M hM W NW W K M V SS 4 X E X 2 X W X X BOW BOX en eterna a N OB E GR E X 5E GR mW 9 Y kk hk Kk W HA E 8H qz 5 U R M Kk 98 95 gas M B R amp 5 amp B v see W W W W M NM HB ek 9 M BN 9 NB NM EK B W NM Sampling Head Installation and Removal Power Information Power Cord Information Memory Backup Power Operating Environment Operating Temperature Ventilation Requirements Packaging for Shipment Theory of Operation s System Functional Overview Acquisition System Block Strobe Distribution Block Time Base Controller Block Trigger Select Block Executive Processor Block Memory Management Unit Block Waveform Memory Block Front Panel Controls VO BIOGK amanna t W ho R 3 Ko BOB SH Y Y N 4 9 P 4 PF EK NH NH NH B E E P E W Y 9 aA He 8 W W k RAH h Wo P amp A H W B WW M H4 2 M M WW B R 33 FK M Y KR oW NS G4 G4 H8NoOk ko FAH FH hb 9 53 m 3 X d A A boh 5 hod 3 B3 yl K 3 3 Bo Bo 8 8 V 39 c 093 39 8 8 Go o Y MX NH NB NB NB NH BH NB X 4d amp W W M Kk 9 4 M MoX ROBA X X oNH SON SHOE 3 o oW EA amp NH g 9 9 9 9 8 b W Kt b
30. Neutral Light Blue White Grounded Earth Green Yellow Green Standard Option A1 Option A2 Option A3 North American Universal Euro UK Australian 115V 230V 230V 230V Option A4 Option A5 Option 1A Option 1B North American Switzerland North American North American 230V 230V 115V High Power 3 Phase Canadian Standards Association certification includes these power plugs for use in the North American power network Figure 2 2 Power Cord Piug Identification st APA anr iA PPP Ue O Snr rer 44414444448 SSS HAVA 118018 Service Manuai 2 5 Operating Information Memory Backup Power Operating Environment 2 6 There are four batteries within the instrument that allow the retention of volatile memory upon loss of the AC power source These self contained power sources provide memory backup power to retain the following front pane settings stored settings m stored waveforms u Time amp Date parameters w Time Base Cal Constants these are regenerated automatically if lost a the number of hours of instrument on time power on sequences and instrument serial number The batteries have a nominal shelf life of approximately five years The following environmental requirements are provided so that you can ensure proper functioning and extend the operation of the instrument Operating Temperature The instrument can be operated where the ambient air temperature is
31. PLUNGE POM segoii sre tob einni eds a Mane basi beak Petar 3 17 Rus A13 Mother Board mam m 3 17 qe A14 Input Output I O Board TO 3 18 ques VO Dale Bullet scie ERATS SEES PARERE sant ve 3 18 Eat I O Delayed Data Buffer 00 00 00 ccc ccc cee cece ee ee aes 3 18 Timer Configuration 4o DR Ier dcbet p ER sede 3 18 RBA Tite GICK iuste eio eo Eo d CREE 3 19 Serial Data Interface SDI eveeeeeeeeeeeeraeiee 3 19 TONE Generalo uos s Ro COH a eG ERG 3 19 Temp Tone Readback Buffer 0 0 00 3 19 an Contents 11801B Service Manual A15 Memory Management MMU Board 2 22 cece MMU IC Waveform RAM Display Interface BOBO 8 8 3 9 8 H8 934 8 va kd W Bh b bh P RR EX 9 8 H8 b 3 Ww NW 4 hh 9 b m M m m a Ga og da A hBo x BN 3 93 Xo da 4 bpn W 4 A B o B k 4 4 o3 4 3 3 e amp 8 amp 4 4 34 93 AX 3 X E 3 34 4d 9 E E bk b 4 o S o3 9 9 4 Time Base Controller Interface ieeeeeeeeeeeeeeeena Executive Processor EXP Interface 6005 Display IC Microprocessor Bit Map RAM es B BG nanan C Got Bo amp 4 d b WV Bow NW W G3 4 9 Mo ohh o 9 9 9 9 B o c1 Wo 9 9 Ae 3 93 4 8 GC GC EK oW 4 5 P9 M 3 K 8 3 4 DOO 3 3 4 oO P 039 3 3 GF 4d 934 o an on o a3 A d koh ok 4 34 4 734 3 3 3 G Wevetorm Dis
32. Performance Verification Performance Tests Internal Clock This procedure verifies the correct operation and accuracy of the oscillo scope s Internal Clock signal Measurement Limits The measurement limits of the internal clock pulse are as follows m rise time lt 2 5 ns m frequency of 100 kHz 3 accuracy m duty cycie 50 3 Setup to Examine Internal Clock CH 1 11801B 12 RF Cable internal Clock Output Procedure to Examine Internal Clock C Step 1 Install the SD 24 Sampling Head into the position shown in the setup diagram CH 1 CH 2 slot If the unit was in standby mode set the ON STANDBY switch to ON C Step 2 Initialize the mainframe as follows CA EFRY DIRO duce wa th Ee dE de RE RECO eines press Initialize in major menu eeeeeeeee ee nee ee erro touch Initialize in verification pop up menu 0 000068 touch Step 3 Trigger the oscilloscope as follows TRIGGER DURON mm rel od eno t e ob e COCA DR CES press Source in pop up menu 2 eee Internal Clock 1 Step 4 On the Sampling Head press the Channel 1 select button EL Step 5 On the oscilloscope press the AUTOSET button 11801B Service Manual 4 41 Performance Tests C Step 6 Check the rise time as follows MEASURE DURON percert RR RC ARES e E RCRUM pde cud dcn Dress Measurements in the maior menu 00 touch Rise in the pop up menu 0 0 0 cece nee ee touch Check that Rise is
33. Power On ON OFF Kernel Tests Executing OFF ON Kernel Tests Failed OFF OFF Kernel Tests Finished Maintenance Diagnostic Troubleshooting Figure 6 34 A15 MMU Board Test Point and Status LED Locations 11801B Service Manual 6 99 Diagnostic Troubleshooting Time Base Processor Error Index Codes Error index codes for the Time Base Processor are listed in Table 6 15 Table 6 15 Time Base Processor Kernel Error index Codes Error Indexnex Suspect Hybrid Suspect Board FRUs IC FRUs TBC 3 FW TBC 2 TBC A TBC MMU TBC TBC MMU O mialrlr i The error index code bits of the first Time Base kerne test that fails are read from the A5 Time Base Controiler board status LEDs ST4 MSB ST3 ST2 and ST1 LSB The bits are true one when the LED is on Also status LEDs ST5 and ST6 indicate when the test is executing and when the test has failed respectively See Figure 6 35 for the location of these status LEDs The patterns from the status LEDs are applicable only when the Time Base is executing or stopped in Kernel diagnostics 6 100 Maintenance Diagnostic Troubleshooting 2 G4OB Q00000845 uf pas ugl i P ueOoOoO00O0nt i i a e a ET Tema 104 cet ii za HE d ety ST5 Test Running ST6 Test Failed i umm F c CDS m ZA uL eL Z7 Ju 9 i ES peettante MS p THERE PU ini rm i i ii A i iii ii i AE QE ru Yr Y an T F i for
34. RS 232 C connector s m Torx head screw and washer at lower left if present Step 6 Remove the A12 Rear Panel Assembly from the rear panel connector plate The metal covers on the PRINTER and on the GPIB connectors are loose If the board is inverted these covers will fall off To replace the A12 Rear Panel assembly perform the previous steps in reverse order NOTE Replacement of connector J78 will be simplified if you replace the connector before reinstalling the rear panel connector plate on the rear of the chassis 11801B Service Manual 6 45 Corrective Maintenance 6 46 RS 232 C Connector J78 so As Viewed from the Rear with the Rear Panel Removed GPIB Connector PRINTER Connector A Figure 6 17 Removing Replacing the A12 Rear Panel Assembly Maintenance Corrective Maintenance A13 Mother Board Removal and replacement steps are listed below See Figures 6 7 6 18 and 6 32 for connector screw and index locations Step 1 Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover Remove the card cage retainer from the top front of the card cage by removing the card cage s two screws Remove both circuit board guides from the top of the card cage The other ends of the guides contain slots which attach to the edge of a metal bracket Both ends of the guides can be pried loose Step 2 Remove the A14 I O A15 MMU A17 Executive Processor a
35. V and 5 25 V m Regulator Reference must be within 9 95 V and 410 05 V Setup to Examine Voltage Supply 11801B L LLLLLL Digital Voltmeter ou Co Low TP200 VCC and To 45V TP300 GND on A18 Memory Board To Ground see Figure 5 1 Procedure to Examine Voltage Supply Step 1 Set the oscilloscope ON STANDBY switch to ON and initialize as follows OPERY DERE eoeu iurant env aito Ribas tata ous Dress Initialize in major menu sveeeeeeeeeeeee lesse touch Initialize in verification pop up menu esss touch C Step 2 With the oscilloscope top and bottom covers removed refer to the Maintenance section and locate the A18 Memory board 11801B Service Manual 5 7 Adjustments Step 3 Connect the digital multimeter to TP200 and TP300 as indicated in the setup illustration see also Figure 5 1 Step 4 Check that the Digital Voltmeter reads within the limits of 4 85 V and 5 25 V TP200 VCC TP300 GND me reos NEN eRe queliBgeo is PS oge seon S NS caterers ogge tete es 00 me el ese e eee neh see Eee to sss tN FEST E eh hens 0 ofall nralaacec oet tetesotoc ay tuo tetetatetstete 55599 go oa ona o ow ose gee REL SPMD e Aire eh Te ttn eats tt terete nett ee uet doh titur te eque tt NNI INI aa dese http esee iM Peewee Bees eel ced Fees E tnnt o0 e ete ees ete ettet retentu iras mena mene m aac cere ert rust uttter aret utter SEE AEE at eee ee eee V ies 4 M88 0 s n
36. Wo XR HK E BH au m m hh k VW bh 4 Ek B B M 32 5 3 K v OF ww B B B D 3 3 N B NH E W t hn uM WF 9 9 8 T 9 NM kk 9 9 H X WW amp KR hh W bh k x3 Xo BOUM V U B UH D D d HK ss NB NH NH HB EK E NH W M 9 hb AHH WW amp sa 9 4 W WM WW 9 MW kh B BN X X U amp E NM 2 5 5 9 9 8 X E Y 3 W amp 8 b TK A A n B B hb Ko He HR HF Mo b ee ee BORD 3 X t5 3 n 8 B B NH NH YT B MH EU M 2 UE d M 34 H k Waveform Compressor and Display Control Block Power Supply esee Typical Waveform Processing Cycle 11801B Service Manual ob wee ee HH d x ou St DbDWS YHe eer eas sz E 8H 3 NB BH E Ek V vU hk K h X 8 DO ut e amp xiii XV 2 1 Dn and 2 5 2 6 2 6 2 6 2 6 2 7 3 3 3 3 3 3 3 3 3 3 3 4 3 4 3 4 3 5 3 5 3 0 3 6 3 6 CREER ee C Feet GN ES Block Diagram Descriptions 00sec cee ee eee cease 3 7 TN SE A1 M F Strobe Drive Board ssssssee erenn 37 wes l diss Data BUNGIE MD CETT 3 7 GR Address Latch acssssacentiantsdatse dcc oM UR es do eon ors 3 7 mut Function Decoder issues hase ae 3 7 ESA Internal Clock Rate Generator llululsuessues 3 7 is Contro BUNCE sacs accosted otto oet E a b ERU UR 3 8 is A3 M F Power Connect Board cceececueeeeuees 3 8 a A4 Regulator Board eeeeeeeeee ee eer
37. be tween 0 C and 50 C and can be stored in ambient temperatures from 40 C to 75 C After storage at temperatures outside the operating limits allow the chassis to reach the safe operating temperature before applying power Ventilation Requirements The fan draws air through the side panels of the instrument and blows air out through the rear to cool the instrument To ensure that this cooling process occurs properly allow at least two inches clearance on both sides and the rear of the instrument The top and bottom of the instrument do not require ventilation clearance If air flow is restricted then the instrument s power supply may temporarily shut down Operating Information Operating Information Packaging for If the instrument is to be shipped for long distances by commercial transpor Shipment tation it should be packaged in the original manner The carton and packag ing material in which your instrument was shipped should be saved and used for this purpose Also if the instrument is to be shipped to a Tektronix service center for service or repair attach a tag to the instrument showing the following m owner of the instrument with address w name of person to contact at your firm w complete instrument type and serial number m if possible furnish complete system firmware versions as displayed in the instrument Options pop up menu selected from the UTILITY major menu u a description of the serv
38. charge To prevent electric shock fully discharge the anode before removing the CRT Short the anode lead from the CRT to the chassis Wait approximately ten minutes and again firmly short the anode lead to the chassis Then remove the CRT If the CRT breaks the glass fragments scatter at a high velocity implosion Use extreme care when handling the CRT Protective clothing and safety glasses should be worn Avoid striking the CRT on any object which might cause it to crack or implode When storing a CRT place it in a protective carton or set the CRT face down in a protected location with smooth surface and with the CRT faceplate on a soft mat See Figures 6 1 6 4 6 5 6 6 6 7 6 13 and 6 32 for module connector screw and index locations Hemove the CRT as follows C Step 1 Remove the three Torx head screws that secure the CRT cover and then the CRT cover Step 2 Set the instrument in the inverted position Step 3 Use a 1 16 inch Alien wrench to loosen the two small screws that secure the two control knobs Carefully remove the control so knobs that you do not lose the small Allen screws inside the knobs When replacing the two control knobs do not overtighten the two Allen screws Step 4 Remove the two Torx head screws on the bottom of the A9 Touch Panel Assembly L Step 5 Lift up on the bottom of the A9 Touch Panel Assembly and swing the assembly outward The top of the A9 Touch Panel Assembly i
39. depends only on the time base settings and is updated when the Main Size and Main Position values 3 10 Theory of Operation Block Diagram Descriptions change Triggering is held off to beyond the rightmost point in the Main record The minimum value is 5 us The Actual Holdoff auto mode calcula tion is Actual Holdoff auto mode max 5 us 5 us Main Pos Duration where Duration Main Size x 10 divisions Manual Hoidoff extends the trigger hoidoff to longer periods up to 2 5 seconds The Actual Holdoff value depends on the value of Requested Holdoff in addition to the time base settings The Actual Holdoff manual mode calculation is Actual Holdoff manual mode max 5 us 5 us Main Pos Duration Requested Hoidoff Time Base This circuit is a very precise slewing delay generator It accepts triggers from the reference oscillator generates a precise delay and outputs a strobe drive pulse The time base circuitry consists of a TECL integrated circuit IC which contains three six bit high speed counters and a CMOS IC which contains a 48 bit programmabie strobe delay generator On the first sample of the waveform the sample is taken immediately after a starting delay Subsequent samples are delayed by an small additional amount called the dot delay The dot delay is programmed and stored into the strobe delay register Each sample is delayed by one delay more than the previous sample The dot delay can
40. e Rosie Ke EA RAe TANP UA TO e e TO TEE HEEL LUCR coicie tos aa a ARSMEE REX A RAE ELE MR ee RS 8 WSs ms me es is fos Voip oT P p IRR a sa Ga sa oga V VR Rig a even nam KapuEF REN NERenmp usse muss BR Games ant Was n ai names cts sau a i s wq ay AA I UU Ne NNUS EE NEM P 6 Se uuu eld M oar vola as rs dau c fra as ae Mae ta ee cas SEAS RCRUM ord cu i s St is Me Mima wae has i IR l ia ds is RP EPIO NU pale VERRE RE RR COO LR EN PRETEND AE ERR A NERIS RES SCRNERNENTEOISERQUEENDEERENEOUCUEEEREE ES EET 6e wear tute atur tarte so o roo osqepeseposspasiaese ta Su tese DX Sau goa NS ete s ee ec serrer PP IEEE TEE P106 To A13 Mother Board Connector Front of Oscilloscope b Lithium Battery BT150 Figure 5 1 A18 Memory Board Test Point Locations 5 8 Adjustment Procedures Adjustments Setup to Examine Adjust Voltage Reference 11801 B leis Digital Voltmeter A2A2 Control To TP701 Rectifier Board see Figure 5 2 To TP221 This procedure should only be performed if maintenance is required This is not necessary for verifying instrument specifications Procedure to Examine Adjust Voltage Reference EL Step 1 Perform the following settings in the order listed a Set the front panel ON STANDBY switch to STANDBY and the rear panel PRINCIPAL POWER SWITCH to OFF Disconnect the oscillo scope from the power source b Remove the Power Supply module following the pro
41. ee touch Biock in major menu seeeeeeeeeeeeeeee ean mnn touch External 1 O in pop up menu eeeeeeeeee ee ees touch Area in major menu 00 002 ccc ccc ee ee eee eas touch GPIB in major menu cece RI touch Routine in major menu 2 6 ee ce cee touch _ Step 3 Select and run the following tests Select Run to start the Intrpt Reset test touch Select Reset Status and then Run to start the test touch Select Data Lines and then Run to start the test touch Select Interrupt and then Run to start the test touch O Step 4 Check that all four of the previous tests have executed and passed Then exit as follows Select Exit twice to exit Extended Diagnostics touch 4 20 Performance Verification Performance Tesis Vertical Reference This procedure checks that the vertical reference voltage is at 5 V at J63C Voltage on the A26 M F Acauisition Interconnect board see Figure 4 1 This procedure should only be performed if maintenance is required This procedure is not necessary for verifying instrument specifica tions Specifications The measured voltage must be within the limits of 5 V 200 uV and 5 V 200 UV Setup to Check Vertical Reference Voltage 11801B 5 LLLLLL Digilal Voltmeter eu l e Low A26 M F Acquisition To x5V interconnect Board see Figure 4 1 Procedure to Check Verti
42. en en ham 3 8 s Voltage Fault Detect 0 0 0 0 cc cece cece cece a eeaereay 3 8 MD A5 Time Base Controlier Board esses 3 9 MICTODFOCGOSSOP hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmcccih 3 9 RAM ROM Memory 0 00 00 cee eevee e 3 9 Nina MENG si mM PC D m 3 9 Lr uino PT 3 11 je Acquisition System Interface ise ses esses 3 11 E Memory Management MMU Interface 3 12 P A7 CRT Socket Board Mia rd aba E E o m Red Green and Blue Video Amplifiers Luuuuu 3 12 Hd Red Green and Blue Adjustments suuue 3 12 Convergence Adjustment essere 3 12 A8 CRT Driver Board T STUPET 3 13 PIOMZOM Al SWeBD io edn tiek RD ea idR e Rd c ow Boa 3 13 Vertical j9oWBOBD cba d Ee obe a etuer bu eoe 3 13 High Voltage and Grid Voltage Generator 3 13 PS CS MD TTD 3 14 zm Beam CurrentLimit seeeeeeeeeeeeeeeeeee ee ee ee xa 3 14 Ba Cie T eee ee ee 3 14 cail A9 A10 and A11 Front Panel Boards Mupepreadnrsesdue Bep ee Touch Panel Major Menu Keys and Menu Status LEDs 3 14 a A9 Touch Panel Assembly 0 0000000 cece ee eeeae 3 14 F A10 Front Panel Control Board n n uassi 3 15 b A11 Front Panel Button Board 3 15 F A12 Rear Panel Assembly N S 7 id GPIB Data and Address Bus 000 002 cece eee 3 16 Standard RS 232 C Controller llle suus 3 16 we
43. installed circuit boards and heat damaged parts The corrective procedure for most visible defects is obvious however particular care must be taken if heat damaged parts are found Since overheating usually indicates other trouble in the instrument correcting the cause of overheating is important to prevent the damage from reoccurring 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 Preventive Maintenance 6 4 Maintenance Power Supply Voltage Hazard Ordering Parts 11801B Service Manual Corrective Maintenance Corrective maintenance consists of module and board replacement proce dure for repairing the instrument Use caution if working near any metal faced part in the Power Supply module WARNING All metal components including any metal faced ones in the Power Supply module should be considered hazardous because these components may be at the AC line voltage potential Always remove the line power cord before attempting any disas sembly procedures An electric shock hazard exists when the instrument is not grounded Do not remove the ground wire green yellow that connects the Power Supply module chassis to the instrument When ordering replacement parts from Tektronix Inc include the following information instrument type instrument serial number a description of the part Tektron
44. microprocessor The RPA1 RPA4 address lines are used by the microprocessor to select individual registers in the GPIB control ier The STD RS SEL line goes low when the microprocessor wants to com municate with the RS 232 C controller This line also drives the Chip Enable The RD and WR signals are driven by the microprocessor to signal if the GPIB controller is to be read from or written into The controller sets the STD RS INTR interrupt line low to request service from the microprocessor The microprocessor writes a byte into the controller s transmit buffer to transmit data on the RS 232 C bus The microprocessor reads a byte from the re ceiver buffer to receive data from the RS 232 C bus The microprocessor 3 16 Theory of Operation A13 Mother Board 11801B Service Manual Biock Diagram Descriptions can also read the status of the controller The RS 232 C controller translates the parallel data from the microprocessor to serial data from RXD on the RS 232 C bus to parallel data for the microprocessor There are transmit and receive buffers which are compatibie with the RS 232 C bus Clear To Send CTS and Data Set Ready DSR are RS 232 C control signals that can be controlled by the microprocessor Request To Send RTS and Data Terminal Ready DTR are signals that can be read by the microprocessor The Received Signal Detect RSD control signal is always high when power is on This RS 232 C port is a DCE type Print
45. not in the mating recesses in the socket E Step 4 Push down on the cover keeping it flat on the IC Slide the cover end tabs into place Hold it there while moving the retaining clip over the tabs at the other end of the cover Cl Step 5 Slightly pull on the cover to check that the cover is secure C Step 6 Replace the A14 I O board Maintenance Corrective Maintenance Time Base Processor Firmware U3TO U300 U400 U410 Serial Data interlace IC U330 A5 Time Base Controller A14 input Output I O D splay Processor Firmware U140 UTtT50 U830 U820 U810 U800 Executive Processor Firmware U900 U970 U920 U930 A15 Memory Management Unit A18 Memory Acquisition Processor us dL o Ros P Firmware 2 5 00 2 gy o U6t1 A28 Acquisition MPU Figure 6 30 FRU IC Detail 11801B Service Manual 6 67 Corrective Maintenance Firmware Integrated Circuits Dual In Line Package ICs The firmware ICs are located on five separate boards see Figure 6 30 for the IC locations on each circuit board The boards and their respective firmware FW are w AS Time Base Controller board Time Base Processor FW U300 U310 U400 and U410 z A15 MMU board Display Processor FW U140 and U150 z A18 Memory board Main Processor FW U800 U810 U820 U830 U900 U910 U920 and U930 m A25 and A28 Acquisition MPU boards Acquisition Processor FW U611 All of the ICs listed above are ord
46. on two channels one for each crossing point of the timing measurement When the transition points are found the Acquisition processor reads the sample number from the hardware and stores it in a specific location in the shared memory for the Time Base Controller The Time Base Controller reads these po nts from each channel involved in the measurement subtracts these points and then multiplies the result by the sampling interval The result is a measurement of the time between two threshold points Timing and Sampling Head Control This hardware generates analog control voltages that control several sam pling head operation and calibration parameters For example the loop gain calibration adjustment is controlled by an analog voltage generated in the oscilloscope for each sampling head channel In addition three digital control lines go to each sampling head two to enable or disable TDR on each channel and one to enable smoothing for both channels in a head This circuit block also generates timing signals that control when waveform data is digitized and when the measurement hardware is clocked The time base sends a strobe pulse to the acquisition system and to the sampling head to initiate a sample Each acquisition processor can also generate strobe pulses locally for Self Tests and diagnostic purposes 3 28 Theory of Operation 11801B Service Manuai Block Diagram Descriptions Shared RAM The memory for the A25 A28
47. operating the instrument with the covers removed do not touch exposed connections or compo nents Dangerous potentials exist at several points throughout this instrument To avoid electric shock disconnect the power before cleaning the instrument or replacing any parts Some transistors have voltages present on their cases The top and bottom cabinet panels or covers protect you from operating potentials present within the instrument In addition the panels reduce radiation of electromagnetic interference from the instrument To remove the panels loosen the fasteners and lift the panels off Operate the instrument with the panels in place to protect the interior from dust 11801B Service Manual 6 1 Preventive Maintenance Cleaning the Instrument 6 2 The instrument should be cleaned as often as operating conditions require Dirt in the instrument can cause overheating and component breakdown Dirt on components acis as an insulating blanket and prevents efficient heat dissipation Dirt also provides an electrical conduction path which may cause the instrument to fail The side panels reduce the amount of dust that reaches the interior of the instrument Keep the side panels in place for safety and cooling Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument Use a nonresidue type of cleaner preferably isopropyl alcohol or totally denatured ethyl alcohol Before using any ot
48. significant bit and the WAVEFORM label represents the LSB least significant bit When lit the LEDs represent a one For example error index code 12454 causes the STORE RECALL and TRIGGER LEDs to light Table 6 10 Executive Processor Kernel Error Index Codes Error Indexaex Hybrid IC FRUs Suspect Board FRUs 1F 1D MEM EXP 1G 19 FW MEM 18 16 IO EXP 15 EXP 14 EXB MEM 13 FPCTRL IO MPU 12 IO EXP 11 IO EXP 10 OE REAR IO MPU OD MMU EXP OC EXP MEM OB REAR IO EXP The status LEDs DS306 and DS307 on the A17 Executive Processor board will flasn while the Kernel diagnostic tests are executing If a kernel failure is detected then one or both LEDs will remain on Table 6 11 lists the various LED configurations and their significance Reading the Executive processor subsystem error bits from the A17 Execu tive Processor board test points TP201 MSB to TP205 LSB is also possi ble See Figure 6 33 for the location of these test points and status LEDs The bits are high 5 V true 6 94 Maintenance Diagnostic Troubleshootina Tabie 6 11 Executive Processor Status LED Configuration DS307 DS306 Significance ON ON Power On ON OFF Kernel Tests Executing OFF ON Kernel Tests Failed OFF OFF Kernel Tests Finished TP205 LSB 5V et ee C M re NINE RS Nt oig eo Sy LE eee i 25 ad Car SP ee Figure 6 33 A17 Executive Processor Board Test Point and Status LED Locatio
49. so that the devices can respond at the proper moment in the bus cycie Reset This circuitry generates synchronized ready and reset control signals Wait State This circuitry extends the bus cycle so that slower devices have sufficient time to read or write data Interrupt Controllers These circuits constantly monitor the EXP s interrupt lines to ensure that the highest priority interrupt gets serviced first The Interrupt controllers provide the ability to assign priority levels to all the system s interrupt lines and conversely to ignore mask any of the interrupt lines as well DMA Controller This circuitry shortens the GPIB transfer time and also the transmission time of waveforms through the GPIB 11801B Service Manual 3 23 Block Diagram Descriptions A18 Memory Board The A18 Memory Board provides the Executive processor EXP with system RAM SRAM Nonvolatile RAM NVRAM and EPROM for most operations Support circuitry for the memories and diagnostic circuitry for trouble shooting are located on board All accesses to SRAM NVRAM or EPROMs are initiated by the A17 Executive Processor board specifically by the EXP or the DMA controiler Refer to the discussion of the A17 Executive Proces sor board earlier in this section for bus cycle timing information The A18 Memory board consists of the following circuitry w Address latches w Address decode and memory select circuitry mu EPROM and system RAM Me
50. switching C Step 6 Monitor the following diagnostic run functions and note the range of possible results Diagnostics Each time the front panel ON STANDBY switch is set to ON the oscilloscope performs Kernel diagnostics on its microprocessor subsystems followed by Self Test diagnostics on most all of its major circuits Failures from either of these two sets of diagnostics may cause the oscilloscope to enter the Ex tended Diagnostics menu as described later in this section When Kernel diagnostics begin the Diagnostics in Progress and Comm Test in Progress messages are displayed on the screen If the oscilloscope is being powered on from a cold condition then the diagnostics may be completed before the CRT is warmed up and able to display these mes sages Diagnostic routines are then performed in parailel on each of the oscilloscope s microprocessor subsystems Display Executive Time Base and Mainframe Acquisition Following successful execution of their Kernel diagnostics Acquisition microprocessors attempt to communicate with the Time Base microprocessor and the Time Base and Display microprocessors attempt to communicate with the Executive microprocessor Successful completion of Kernel diagnostics is indicated by the start of Self Test diagnostics A failure of Kernel diagnostics will be indicated by the message Dsy Kernel Failure or Comm Test in Progress displaying on the screen for Display kernel failures and or by a s
51. test leads Calibration Genera DC output 0 25 Tektronix PG 506 Calibration tor accuracy 1 V output Generator with a TM amplitude 500 Series Power Module Frequency Counter One Part in Tektronix DC 5010 Universal 1 000 000 Accuracy Counter Timer with a TM 5000 Series Power Module Calibration Head Tektronix Calibration Head 067 1413 00 Precision Voltage DATA PRECISION 8200 Source Test Terminal any GPIB IBM compatible PC with IEEE 1978 terminal emulation software controller or ASCII terminal equipped with an RS 232 C port Requires compatible RS 232 C serial interface cable Coaxial Cable 50 Q 500 36 inch male Tektronix Part 012 0482 00 3 required BNC connectors Coaxial Cable RF HF cable 12 in Tektronix Part 174 1364 00 SMA connectors RF cable 8 5 in Tektronix Part 174 1120 00 SMA connectors 118018 Service Manual h co Adjustments Table 5 2 Test Equipment Cont Description Minimum Examples of Applicable Specification Test Equipment Adapters BNC female to male Tektronix Part 103 0090 00 Dual Banana BNC maie to female Tektronix Part 103 0035 00 Dual Banana SMA male to BNC Tektronix Part 015 1018 00 femaie 8 required SMA female to BNC Tektronix Part 013 0126 00 male SMA maie to N Tektronix Part 015 0369 00 male Power Divider 50Q 6dB load isolation Tektronix Part 015 1014 00 50 Q SMA connectors Termi
52. the 11801B Digital Sampling Oscilloscope Figure 2 1 shows the front panel of the 11801B Digital Sampling Oscilloscope and the locations of the sampling head compartments Acquisition Sampling Head Compartments 11801B Antistatic Connections Figure 2 1 Sampling Head Compartments in the 11801B Digital Sampling Oscilloscope Operating Information 11801B Service Manual Operating information With the ON STANDBY switch set to STANDBY place the sampling head in a compartment and slowly push it in with firm pressure Once the sampling head is seated turn the lock down screw to tighten the sampling head in place Never install or remove a sampling head when the ON STANDBY switch is ON Installing or removing a sampling head when the power is on may damage the oscilliscope To remove the sampling head set the ON STANDBY switch to STANDBY Turn the lock down screw to loosen the sampling head and then siowly pull out the sampling head Operating Information Power Information The rear panel LINE VOLTAGE SELECTOR allows you to select either a 115 V or 230 V 48 Hz to 440 Hz nominal supply source The 6 A 250 V line fuse is used for both 115 V and 230 V operation GROUNDING For electric shock protection make the grounding connection before making any connection to the instrument s input or output terminals This instrument is safety Class 1 equipment IEC designation All accessible conductive parts are directly
53. the Card Cage 0 ccc nne 6 30 MMU Board Figure 6 20 Removing Replacing the A15 MMU Board 6 52 Figure 6 32 Multi Pin Connector Orientation and Semiconductor INGEXING Dara 9 168a da gard oe lb acid ERO D e ao e Wy s 6 74 A17 Main Processor Board Figure 6 7 Top View of the Card Cage essere 6 30 Figure 6 21 Removing Replacing the A17 Main FProbDessor BOSE eriten ra te o oae ed Peet ice vaa 6 54 Figure 6 32 Multi Pin Connector Orientation and Semiconductor lngexind Diagram oua 2 scd ror 93 doeet ap ae XR SCR OH 6 74 A18 Memory Board Figure 6 7 Top View of the Card Cage usse 6 30 Figure 6 22 Removing Replacing the A18 Memory Board 6 56 A19 Strobe TDR Buffer Figure 6 23 Removing Heplacing the A19 Strobe TDR Board BUG SOS copa Mire Bet heic a b Y aiutare tu iet es 6 58 Figure 6 26 Removing Replacing the A26 M F Acquisition Interconnect BOA iie Ra ORT E RACES der 6 61 Figure 6 32 Multi Pin Connector Orientation and Semiconductor INGEN Diadan e osos rer PRA PARRA eta he Eas 6 74 A20 A23 Head Interconnect Figure 6 23 Removing Replacing the A19 Strobe TDR Boards BUJ sia ca S bcd e ene m Edo eda ODER d basa oe duit 6 58 Figure 6 24 Removing Replacing the A20 A23 Head interconnect BOBIOS eoo da Up eS EIE Dd en So Ud 6 59 Figure 6 25 Removing Replacing the Front Subpanel Assembly 6 60 Figure 6 26 Removing Replacing the A26 M F Acquisition interconnect BONG xac
54. the following conventions are used m CAPITAL letters within the body of text identify front panel controls indicators and connectors on the oscilloscope for example MEASURE and sampling head u Bold letters identify menu labels and display messages m Initial Capital letters identify connectors controls and indicators for example On on associated test equipment m insome steps the first word is italicized to identify a step that contains a performance verification and 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 involves an electrical adjustment If Examine is the first word in the title the step concerns measurement limits that indicate whether the oscilloscope is operating properly these limits are not to be interpreted as electrical specifications Menu Selections and Measurement Techniques Details on measurement techniques and instructions for making menu selections are generally not included in these procedures Comprehensive descriptions of menus and oscilloscope features are located in the 778078 Digital Sampling Oscilloscope User Manual User Manual The 778078 Digital Sampling Oscilloscope User Manual is strongly recom mended to familiarize the first time user with oscilloscope controls and features pn PU PHARM T AA E E a E d
55. title of a step an 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 oscilloscope is operating properly these limits are not to be interpreted as electrical specifica tions Menu Selections and Measurement Techniques Details on measurement techniques and instructions for making menu selections are generally not included in these procedures Comprehensive descr ptions of menus and oscilloscope features are located in the 11801B Digital Sampling Oscilloscope User Manual User Manual A review of the 11801B Digital Sampling Oscilloscope User Manual is strongly recommended to familiarize the first time user with oscilloscope controls and features Adjustment Procedures Adjustments Power Supply This procedure shows the setup and lists the steps to examine the Mea sured Voltage Supply and to check adjust the Voltage Reference and the Regulator Reference see Figures 5 1 5 2 and 5 3 This procedure should only be performed if the instrument is out of measurement limits and maintenance is required If the oscilloscope is already within limits proceed to the Display procedure Measurement Limits The measurement limits for this procedure are as follows m Measured Voltage Supply limits must be within 4 85 V and 5 25 V m Voltage Reference must be within 5 15
56. to pin 1 C Step 5 Check that the frequency counter reads within the limits of 199 995 kHz and 200 005 kHz M o O 8 Dies i mil i IS i i Nod a lum amm loose C mm 1 i of i i pr dE en 8 Opat mi noon Pi i by BOE j Pin 1 U191 Pin 9 Figure 4 2 A5 Time Base Controller Board Test Point Locations MOHAMMBHLSHUAMNALAMINICAHHAMHM MINIMA HH TIHIR HUN IHR HN rU SH T E UUBUBBULIRHTT UTRAM HMMH MAMMA UU AUN aA UU UU A A AAA VH AC rr rra UU A A4 BA AH HAN IAM Parr 4 24 Performance Verification Performance Tests Vertical Accuracy This procedure shows the setups and lists the steps to check the vertical accuracy of the oscilloscope Setup to Check Vertical Gain Calibration Head DIRECT input 11801B Co Prec Voltage Source o D ea posoose di 50 Q Coaxial Cable LL LLLLLL Procedure to Check Vertical Gain Step 1 Install a Calibration Head 067 1413 00 into the position shown in the setup diagram CH 1 CH 2 slot If the unit is in Standby mode set the power switch to ON Set the Precision Voltage Source to 0 V and connect it to Channel 2 of the Calibration Head NOTE If powering up from a cold start the diagnostics will report an error using the Calibration Head The report will indicate a Time Base error To clear this exit the diagnostics Then ignore the subse quent time base calibration failure notice and continue with the following steps Step 2 init
57. touch matrix and hard keys The display function drives the menu LED light bars A9 Touch Panel Assembly This circuit is comprised of infrared LEDs that produce a matrix of light beams that are interrupted when the user touches a particular touch zone The touch panel and hard key matrix are scanned continuously until a shadow or keypress is detected When a hit is detected that scan is com 3 14 Theory of Operation A12 Rear Panel Assembly 118015 Service Manuail Block Diagram Descriptions pleted and the interrupt line is asserted by the display controller During this time the interrupt is active and no new data is written into the sensor RAM from the touch panel or hard keys even though the hardware continues to scan therefore the data will not change in the sensor RAM while the micro processor is reading it Only one infrared LED is turned on at a time and only the phototransistor directly opposite is selected to receive light This prevents any crosstalk between emitter detector pairs A10 Front Panel Control Board This circuitry generates the 6 bit address bus that is used to select an infra red LED and its compliment phototransistor on the A9 Touch Panel board A11 Front Panel Button Board This circuitry is comprised of the major menu LED light bars which are driven by the display refresh register output of the A7 Display Controller board Internally there is a matrix of display RAM organized in an 8 bit by 8
58. up menu elllle ce ee touch C Step 36 Adjust the Vertical Size as follows Vert at OD Scu Vac dei DECR tenes een ee CES touch Set Vert Size to 5 mV usuuus adiust upper knob Step 37 Set the Main Size as follows FO ZOU ee COT on bsc Ano Rep aite es n Ga See leihen wae touch Set Main Size to 1 ps div 04 adjust upper knob Step 38 Turn mainframe averaging on WAVEFORM DURON adde d elt P o Roe Rd do Roc press Acquire Desc in major menu 00 0 2 0 ee ec touch Average N in pop up menu seeeeeeeeeee ae touch Select Exit in pop up menu see eee ee ee ee eese touch C Step 39 Activate the cursors as follows CUI SOTS ICON serez obenbas Mab ee Sh i en dag oes touch D Step 40 Read the Av located in the major menu Av should be within 28 3 mV and 23 1 mV or within 32 1 mV and 28 3 mV showing that the sweep rate accuracy is within 2096 Step 41 Touch Exit in the major menu 4 38 Performance Verification Triggering 118018 Service Manual Performance Tests This procedure verifies the correct operation and accuracy of the oscillo scope s trigger system Specifications The specifications for triggering using the external trigger are as follows m 100 mMVp p at 300 MHz m 100 MVp p at 1000 MHz 100 mVp p at 3 0 GHz Setup to Check Triggering SD 24 Sampling Head CH1 2X Attenuators 11801B High Frequency S Sin
59. 0 Front Panel Button BOA scaoileann Ape wig REIS oa Ua dar RR 6 43 Removing Replacing the A11 Front Panel BURON DOSO oi oed a ESSE ud pd denied eee 6 44 Multi Pin Connector Orientation and Semiconductor INGSXING Diagram ced riora iR aden weis Se ah inp va 6 74 Removing Replacing the Cathode Ray Tube 6 24 Removing Replacing the A12 Rear Panel Assembly 6 46 Multi Pin Connector Orientation and Semiconductor Ihaexing DIAG ANY dic yids dex age Dre pot e OR Dc lr RACE a 6 74 Corrective Maintenance Table 6 2 FRU Removal Replacement Figure Cross Reference Cont FRU to be Removed Figures to Reference During Removal Page Replaced HA H U MH MMMH MUMEME MREA BTE A13 Mother Board Figure 6 7 Top View of the Card Cage 00 rv 6 30 Figure 6 18 Removing RHeplacing the A13 Mother Board 6 48 Figure 6 19 Removing Replacing the A14 I O Board 6 50 Figure 6 32 Multti Pin Connector Orientation and Semiconductor INGSXING DAGTA xus od op retra eR Ede RC etes 6 74 A14 Input Output 1 0 Figure 6 7 Top View of the Card Cage seen 6 30 Board Figure 6 19 Removing Replacing the A14 I O Board Lesa ee ee 6 50 Figure6 32 Multi Pin Connector Orientation and Semiconductor Indexing DISOLSITM sid ice ours tates de die E e Ev e nen 6 74 A15 Memory Manager Unit Figure 6 7 Top View of
60. 0 Touch Panel Assembly A10 670 8847 01 Front Pane Control A11 671 1130 00 Front Panel Button A12 671 0013 00 Rear Panel A13 671 1129 00 Mother A14 670 8854 02 Input Output A15 671 1023 02 Memory Management Unit A17 67 1 2888 00 Executive Processor A18 671 1890 00 Memory A19 671 2909 00 strobe TDR Buffer No A 657 0090 00 Acquisition Module A20 670 9366 02 Head Interconnect P O 657 A21 670 9366 02 Head Interconnect P O 657 A22 670 9366 02 Head Interconnect P O 657 A23 670 9366 02 Head Interconnect P O 657 A24 670 9364 04 Acquisition Analog P O 657 A25 670 9363 01 Acquisition MPU P O 657 A26 670 9361 00 M F Acquisition Interconnect A27 670 9364 04 Acquisition Analog P O 657 A28 670 9363 01 Acquisition MPU P O 657 10 3 Replaceable Parts Mfr Code 0482 3109 3629 TKO435 TKO488 TKO588 TK1159 TK1 163 TK1262 TK1302 TK1416 TK1465 TK1499 TK1547 TK1572 TK1617 TK1719 TK1727 TK1869 TK1905 TK1916 TK1943 TK1967 TK2072 TK2105 1K2122 TK2338 TK2435 TK2469 0B445 OJROS 0J260 10 4 CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Manufacturer SONY CONSUMER ELECTRONICS FELLER SCHURTER AG H C O PANEL COMPONENTS CORP LEWIS SCREW CO CURRAN COIL SPRING INC UNIVERSAL PRECISION PRODUCTS IMPROVED PRODUCTS POLYCAST INC MURPHY ELECTRONICS INC DIST MOUNTA
61. 2 5 ns Exit Menu in pop up menu ss enn touch Step 7 Change the sweep rate as follows HOBDZOnIa 9 ICON xs diee Er TUE ERROR be X be ms touch Adjust Main Size to 5 us div adjust upper knob L Step 8 Check the frequency as follows MEASURE DUON mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmiumcykycimcmmrmmrmramai ii press Measurements in major menu 0000 00 0 00202 aa touch Frequency in pop up menu 0 0 ee ee ee ee touch Duty Cycle in pop up menu svveeeeeeeeeeeee eee touch Check that the frequency is between 97 kHz and 103 kHz Check that the Duty Cycle is between 47 and 53 Exit Menu in pop up menu sees touch 4 42 Performance Verification Calibrator Output 418018 Service Manual Performance Tests This procedure verifies the correct operation and accuracy of the oscillo scope s calibrator Measurement Limits The measurement limits of the calibrator are as follows m rise time lt 250 ps m 250 mV 10 Setup to Examine Calibrator Output 11801B kher 12 RF Cable Calibrator Output Procedure to Examine Calibrator C Step 1 Instali the SD 24 Sampling Head into the position shown in the setup diagram CH 1 CH 2 slot If the unit was in standby mode set the ON STANDBY switch to ON C Step 2 initialize the mainframe as follows UREY DION cit nike ie et contre eee ee IER OUI 6 press Initialize in major menu 6
62. 2 uV 50 mV div 1 58 mV 100 mV div 3 16 mV 200 mV div 6 32 mV C Step 13 Power down the oscilloscope Repeat Steps 1 through 12 for all sampling head compartments AIRE AMAA PU HH HAMA NEU HABRA LOL PPP HARUM ANN UMANE EVA MAU AM amail 11801B Service Manual 4 33 Performance Tests Sweep Rate Accuracy This procedure shows the setups and lists the steps to check the Sweep Rate Accuracy Setup to Examine Sweep Rate Accuracy CH1 SD 24 11801B Er TC jd ol oot ey High i i Frequency 4 lo ET IN oi Signal i i Generator Output 50 Coaxial Cable 80 0 Coaxial Cables Power Divider Procedure to Examine Sweep Rate Accuracy Step 1 Install the SD 24 Sampling Head into the compartment shown in the setup diagram CH 1 CH 2 slot If the unit is in standby mode set the ON STANDBY switch to ON C Step 2 Initialize the mainframe as follows OULU DUON xk 2 35 Lies aaa ES beeen eG tee tad a noz a press Initialize in major menu see ee ee ee ee ee touch Initialize in verification pop up menu touch Step 3 Set the horizontal record length as follows Horizontal Desc in major menu 005 touch Main Record Length in pop up menu touch Set Main Record Len to 1024 points adjust upper knob Step 4 identify the trace as follows DEF 4 io Lara Cain rai eieaa E I seoigh wes duse touch Identify Mainframe
63. 3 7 kHz This waveform is applied to the de gauss coils that are located on both sides of the CRT The decayed oscilla tion through the coils causes a magnetic field to be induced in the CRT steel aperture grille This magnetic field saturates the steel and then forces the stored magnetic field down to zero as the steel is driven around its hys teresis curve Beam Current Limit This circuit limits the average power to the CRT to less than 15 W An ampli fier circuit compares the sum of the anode current and the FOCUS adjust ment current to a reference current of 0 72 mA If the sum of the two currents exceeds the reference current then the three video amplifiers on the A7 CRT socket board are disabled Grid Bias This circuit provides 40 V of grid bias to the A7 CRT Socket board At power off the grid is supplied with 90 V until the focus circuit discharges a high voltage Th s prevents a bright spot from appearing at the center of the screen at power off A9 A10 and A11 The A8 A10 and A11 Front Panel Circuit boards specifically consist of the Front Panel Boards AQ Touch Panel assembly m A10 Front Pane Control board e A11 Front Panel Button board Touch Panel Major Menu Keys and Menu Status LEDs These three functions interface to the Executive processor through a general purpose programmable keyboard and display controller IC on the A10 Front Pane Controller board The keyboard function of the IC handles the
64. 4 14 4 15 4 15 4 16 4 17 4 19 4 21 4 23 4 25 4 31 4 34 4 39 4 41 4 43 Contents Cleaning the Instrument eeeeeeeeeeereeeee ee c gais t9 mai a dicheemmmamrmmimrmmaimaae Oe BG ee ea 6 2 CAL gas PEE E E EE EE EE ET 6 2 REO a reo scenes d race Ag Moon SEAL et ee Br GB GP acid gg 6 3 Visual Inspection 000 ccenenese es eedeneneee eens 6 3 Periodic Electrical Adjustment 2 0 0 0 2 0 cee e een eec eee 6 3 Corrective Malnten nCe cera ahhh eh rr ws 6 5 Power Supply Voltage Hazard 00 cece eee eee eee 6 5 Ordering Pale icu yero m e em REA Oed teaver 6 5 Static Sensitive Device Classification ese 6 6 Removing and Replacing FRUS 6cce cece eter renee 6 8 Electrical Lock on of the Front Panel ON STANDBY Power Swllch vsseskaeuecr rr m ERR EROR REACH GC CR D 6 13 Power Supply Module Removal Replacement 6 16 Fan Motor Removal Replacement eese 6 19 Cathode Ray Tube CRT Removal Replacement 6 20 Acquisition Unit Removal Replacement e 6 26 Battery Disposal and First Aid ccc eee econ eee 6 27 Batley DISDOSBl lt 6 ccc tae ede tesa d epe de KR e 6 27 Emergency and First Aid Information 6 28 FRU Board and Assembly Removal eese 6 29 AT MF Strobe Drive Board ui xou SERERE laech e dene 6 31 A3 M F Power Connect Board eeeeeeeeeereeeeeeee 6 32
65. 5 T 20 1 25 Alien hex Wrench 1 16 inch Nutdrivers 3 16 inch 1 4 inch 7 16 inch Needie nose pliers Small Ruler half inch rulings m t4444444440444444444444446664 E E E P E RR REPE RE E SS SSS SS SSS SHS A Antistatci wrist strap Tektronix Part 006 3415 04 errno pa 9 umane REENRNRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRERRRPRTR M ANAAAB RA8I we u be qw Yr Sr rR D a WSS 11801B Service Manual 5 5 Adjustments Using These Procedures some procedures begin with a setup illustration that shows what test equip ment is needed and how to connect it The other procedures require only a calibrated SD Series Sampling Head Refer to Table 5 2 Test Equipment on the preceding pages for an example of the test equipment for each procedure Conventions in this Manual In these procedures the following conventions are used amp CAPITAL letters within the body of text identify front panel controls indicators and connectors on the oscilloscope for example MEASURE and sampling head m Bold letters identify menu labels and display messages m initial Capital letters identify connectors controls and indicators for example On on associated test equipment m n some steps the first word is italicized to identify a step that contains a performance verification and an adjustment instruction For example if Check is the first word in the
66. 6888 024 670936100 ORDER BY DESC 426216600 ORDER BY DESC ORDER BY DESC ORDER BY DESC 426 2165 00 384 1756 00 670936602 210 0458 00 ORDER BY DESC B80 00020 003 348 0235 00 ORDER BY DESC ORDER BY DESC ORDER BY DESC 386 5475 00 Mechanical Parts List Replaceabie Parts Figure 10 5 Acquisition Module 11801B Service Manual 10 19 Replaceable Paris Fig amp Index No 10 20 Tektronix Part No 174 0626 01 174 0627 01 174 0628 01 174 0629 01 174 0630 01 174 0631 01 343 0549 00 Serial No Effective Dscont Qty 12345 Name amp Description CABLE ASSY RF 50 OHM COAX 16 5 L 9 6 FROM A1941C TO A20J1C FROM A19J2C TO A21J2C FROM A19J3C TO A22J3C FROM A19JAC TO A23J4C CABLE ASSY RF 50 OHM COAX 15 0 L 9 5 FROM A19J1A TO A20J1A FROM A19J2A TO A21J2A FAROM A19J8A TO A22J3A FROM A19J4A TO A23J4A CABLE ASSY RF 50 CHM COAX 13 0 L 9 1 FROM A18J1B TO A20J1B CABLE ASSY HF 50 OHM COAX 10 6 1 9 2 FROM A18J18 TO A21J18 CABLE ASSY RF 50 OHM COAX 8 2 L 9 3 FROM A19J3B TO A22J3B CABLE ASSYRF 50 OHM COAX 5 8 L 9 4 FROM A19J4B TO A32J3B STRABTIEDOWN E 0 098 W X 4 0 L ZYTEL re ae SEE MAINT SECTION FOR CABLING DIAGRAM Mfr Code TK2338 TK2338 TK2338 TK2338 TK2338 TK2338 TK1499 Mechanicai Parts List Mir Part No 174 0626 01 174 0627 01 174 0628 01
67. 69 80009 52814 93907 1K1262 TK1499 TK2072 TK1967 TK2469 TKO435 52814 OKBO1 OKBO1 TK1572 TK1727 24931 52814 OKBO5 TK1617 TK1617 OKBO1 80009 TK1163 TK2469 OKBO1 Mechanical Parts List Mfr Part No nn nnn EEE E EEEE A EAEE T E DE e E RET el P E 614091600 ORDER BY DESC ORDER BY DESC B80 00020 003 ORDER BY DESC 386 5268 07 ORDEH BY DESC ORDER BY DESC ORDER BY DESC 42822 4 O9FXES C1 1206 00 00 0541 ORDER BY DESC EC24B50000FB 671113000 ORDER BY DESC 829 07510 024 MEOTO D HW 047 ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC SFR25 2322 181 39JR198 1 ORDER BY DESC 333 3908 01 NA 136 0140 00 ORDER BY DESC 384168202 ORDER BY DESC ORDER BY DESC ORDER BY DESC Replaceable Parts Fig amp Tektronix Serial No Qty 12345 Name amp Description Mfr Mfr Part No Index Part No Effective Dscont Code No ORDER BY DESC 10 2 37 211 0378 00 1 SCR ASSEM WSHR 4 40 X0 375 PNH STL TO OKBOT 88 211 0373 00 2 SCREWMACHINE 4 40 X 0 25 PNH STL 83486 ORDER BY DESC 89 200 3143 01 1 COVERCRT SCALE BEZEL TK1163 ORDER BY DESC 40 218 0022 00 2 SETSCREW 4 40 X 0 188 STL OKBOi ORDER BY DESC 41 366 0582 00 2 KNOB ENCODER TK1168 ORDER BY DESC 1 PANEL FRONT 118018 80009 333390701 42 333 3907 01 Figure 10 2 Front Panel
68. 75 9857 00 Qty 12345 Name amp Description CA ASSY SEELEC 34 3 0 L FROM A14J77 TO A417477 CA ASSY SPELEC 11 18 AWG 7 25 L RIBBON FROM A4J62 TO A2A2J62 Replaceable Parts Mfr Mir Part No Code TK1547 ORDER BY DESC TK1967 ORDER BY DESC 11801B Service Manual 10 17 Repiaceable Parts Fig amp Index No 11 12 13 24 25 26 27 28 d 30 31 10 18 Tektronix Part No 657 0099 00 670 9363 01 670 9364 04 670 9363 01 670 9364 04 426 2167 00 351 0784 00 211 0392 00 426 2168 00 431 1247 00 213 0904 00 351 0781 00 386 5535 00 671 2909 00 211 0409 00 670 9361 00 407 3562 00 426 2166 00 386 5687 00 211 0718 00 381 0452 00 426 2165 00 384 1756 00 670 9366 02 210 0458 00 136 0894 00 211 0372 00 348 0235 00 355 0259 00 333 3421 00 351 0786 00 386 5475 00 Serial No Effective Dscont Qty Y OS By O e 10 gt m 6 m A Pome w M MO A 12345 Name amp Description ACQUISITION MODULE MODULAR ASSY ACQUISITION MODULE 118018 EXCHANGE ITEM CIRCUIT BD ASSY ACQUISITION MPU SEE A25 EXHANGE ITEM CIRCUIT BD ASSY ACQUISITION ANALOG SEE A24 EXHANGE ITEM CIRCUIT BD ASSY ACQUISITION MPU SEE A28 EXCHANGE ITEM CIRCUIT BD ASSY ACQUISITION ANALO
69. 8 and 6 32 for connector screw and Index locations L Step 1 Place the instrument in the inverted position and remove the bottom panel C Step 2 Remove connectors J16 J27 J28 J33A J33B J35 J36 J37 J38 and J39 from the A1 M F Strobe Drive board Then remove connec tors J10 J18 and J34 from the Ai M F Strobe Drive board Note the position of connectors from the A1 M F Strobe Drive board index triangle to ensure that the connectors can be correctly replaced NOTE Record the positions of the connectors to ensure that the connec tors can be correctly replaced L Step 3 Remove the five Torx head screws and carefully lift the board unplugging it from the J19 connector on the A1 M F Strobe Drive board To replace the A1 M F Strobe Drive board perform the previous steps in reverse order Torx Head Screws 2 J27 ALL onnnpnasonpsnnapapo TexHead tence Screws 2 po J28 J17 J33A J38 J39 J33B Torx Head J10 J34 J19 Screw 1 Figure 6 8 Removing Replacing the A1 M F Strobe Drive Board 11801B Service Manual 6 37 Corrective Maintenance A3 M F Power Connect Board TR Removai and replacement steps are listed below See Figures 6 2 6 3 6 9 and 6 19 for connector screw and index locations C Step 1 Remove the Power Supply module as described earlier in this section NOTE The chasis ground wire green yellow wire may be removed from the Power Supply module for this operati
70. 902 ps and 916 ps showing that sweep rate accuracy is within 0 8 Sweep Rate Accuracy 10 ps div Step 19 Adjust the Signal Generator to the following settings mise C EA EE E E E EEEE F 800 MHz PATTIDHEICIO hamameairimmeaikmrmi mm 2 0 Vp p 1 4 Vans Set for 1 000 V 0 004 Vp p on screen Step 20 Invoke smoothing as follows WAVEFORM DURON rS but hee REM r a b in RR EE a press Sampling Head Fne s in major menu touch Smoothing On in pop up menu 0 0004 touch EXIT on DOD UD menu suae ba EIER RO ERCE S UR r a CG a Cn touch Step 21 Adjust the Main Size to 130 ps div 4 36 Performance Verification Performance Tests Step 22 Adjust the Main Pos to 55 ns Step 23 Set the Main Pos contro lower knob so that the zero cross ing of the waveform occurs on the center graticule C Step 24 Set the horizontal reference point to Center as follows so that the waveform will be expanded about the horizontai center WAVEFORM DURO 31 xy X I br ha dois de press Horizontal Desc in major menu 0 0 00 nee touch Center in Dop UD eril cexaxexe rEWetbpEA ORE ETICA touch Step 25 Adjust the Vertical Size as follows Verlical IOL acra ai teh doscientos dione ee ER MAS eee eee RR touch Set Vert Size to 50 mV eee adiust upper knob Step 26 Adjust the Main Size as follows HOMZOMOGUICON cusa Sn irc Ho se GC E Cine Pur ard dd touch
71. A4 Regulator Board 2559 coi REP LEepER Ux e MO HERR ee 6 34 A5 Time Base Controller Board 2 0 0 0 ccc eee eee 6 35 A7 CRT Socket Board and A8 CRT Driver Board 6 37 A9 Touch Panel Assembly eeeeeeeeneeeecceeeeennnes 6 40 A10 Front Panel Control Board 0 005 222 co 6 42 A11 Front Pane Button Board sees 6 44 A12 Rear Panel Assembly sese 6 45 AIS Momor BOA oou et canted tea bw rac dx Rd o et eo ER ded 6 47 A34 Input ouput tUO Board oinaan iey RET UD 6 49 A15 Memory Management Unit MMU Board 6 51 A17 Executive Processor EXP Board ssuse 6 53 A18 Memory Board eva c SERRE ees 6 55 A19 Strobe TDR Buffer Board 0 0 0 ee ee 6 57 A20 A23 Head Interconnect Boards 0 005 6 59 A26 M F Acquisition Interconnect Board 4 6 61 A24 A27 Acquisition Analog Boards ssesesse 6 63 A25 A28 Acquisition MPU Boards 0 2 0 0 0 cee eee 6 64 FRU IC Removal cc cs esee nennen 76 65 Serial Data Interface Integrated Circuits Slam Pack ICs 6 65 Firmware Integrated Circuits Dual In Line Package ICs 6 68 Firmware Upgrade Procedure 0 cca een eee 6 69 Cables and Connectors 1 1 6 cece cece een nen 6 75 aan ccs Manual et a SET nen tenes Contents interconnecting Pins s ssesssarerssresanizrnenses gt 6 75 Coaxial type End Lead Connectors Peltolas amp SMB 6 75 Mu
72. AIL LOCK ELEC CONN ROPT HARDWARE KIT JACK SOCKET SCR ASSEM WSHR 4 40 X 0 5 PNH STL T10 PLATE CONNECTOR STD ALUMINUM PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 SUBPANEL REAR PLATED SUPPORT CHASSIS POWER SUPPLY POLYCARB STRABRETAINING 0 125 DIA NYLON WASHER LOCK 8 EXT 0 02 THK STL CA ASSY SBELEC 18 AWG 6 0 L PIN GUIDE 0 850 L METAL GUIDE PLUG IN POLYAMIDE CHASSIS ASSY BRACKET SUPPORT DELAY LINE ELEC COAXIAL 24NS MTCHD PAIR GROMMET PLASTIC BLACK ROUND 0 625 ID GROMMET PLASTIC BLACK OBLONG NUT PL AASSEM WA 6 32 X 0 312 STL CLAMPCOIL SCR ASSEM WSHR 6 32 X 0 50 PNH STL 115 STRABTIEDOWN E 14 5 X 0 14 PLASTIC COIL RF FXD CLAMPLOOP 0 312 DIA NYLON GUIDE CKT BOARD NYLON SPACER CKT BD 0 47 H ACETAL CIRCUIT BD ASSY CRT SOCKET NOT REPLACEABLE ORDER 672 1372 XX COVER CKT BOARD 1 CIRCUIT BD ASSY FRONT PANEL CONTROL SEE A10 EXCHANGE ITEM BRACKET SUPPORT Mfr Code 80008 OKBO1 TK1943 0JRO5 OKBO1 O0JROS5 80009 OKBO1 TKO588 93907 53387 53387 93907 TK1465 11897 OKBO1 TK1916 OJRO5 85480 OKBO1 TK2469 TKO588 TK1163 TK1943 OJSP9 80009 28520 OJROS TKO435 80009 OKBO1 TK1719 1K1967 06915 30010 80009 TK1943 80009 TK1943 Mfr Part No SS I CUL AME AGER LR CUZ o o a D f EN Co M NERS A SE PSP ASTER SOE PM CUm EER TLE EAE GC RS a TT ETT RC GRUT AD I ela 200369001 ORDER BY DESC ORDER BY DESC ORDER BY DESC O
73. AMINO WF La SAIMU 38018 XNK ioi WI Yun m QO orar peerc E Oe aver over v ae aver gran I a QO vean HOLZSNNO2 vean OYvog OL guwvog 3 18 3 DN ee lt gt gt izm5 ons TROFA Guy 3 TL IN ZSVvadAI L SRBE www SU ga AYAC SU a ATAG HOL 3SN3S 380HlS A Jgwassyv AVY 150 ATWO WT Lan DGuvod iasg ASOVdH3iNI Say UM IM NEC C ee A CC EO n ENUBYA 3914199 gogi L D 1JANNOJHALINIT NOTATSINOJY Say OFr WONA HAAANS WOL ASHYLS GTV PEC ROA HAAANG BOL ARGORLS GEY Beer GL BAAANG YOL AGONLS SFY Veer OL Ba3difig H OL 380815 amp TV ag wo ILJ3NNOJO MNiMOd d W EV Eer Wits HAAINA YOL AGONIS BTV Yoer OL Budd08 811 380HlIS5 GTV veer OL LINN JOWAN AHOWSW STY eer NOH sweet x oig X 1109 uieiBeig Suilgeo xoorg paed 8L08LL 2 6 eunBiy YOLIBNNOS AYAR Di QOHVOSG 3i89V23 DN x 123NNOJ2H31NI NOILISIDDOV gay OF X GG WOHd D LOBNNOSYSLNI NOILIISIDOOY S2V OTs Ver WONd BAIXO Z280Hi1S Str Ql as YATIQULNOD 35Yv83WIA4 SV eer OL OF eer Sar L33205 LHJ e gyva osso i 4208 LYS HOLVOION H23MDd TANY ct ANON Lar BEFA Ea AQONY EST ASOH3H amp NATIOWLNOD 3SYV8SHIL SY a eer Di 70S E IDYLNOA WALGAS CONV vy AYRE HO Lv INA TTF Gan 2 8ES 5H se aly zar ME T3NYvd
74. Acquisition MPU board contains 16 Kbytes of shared RAM This memory is arbitrated on the A25 A28 Acquisition MPU boards between the Acquisition system processor the Time Base Controller processor and the A D converters on the A24 A27 Acquisition Analog board All waveform data acquired by the Acquisition system as well as control and data messages passed between the Acquisition system and the Time Base Controller pass through this shared memory Time Base Controller Interface This circuitry handles requests from the Time Base Controller to access the shared memory on the A25 A28 Acquisition MPU boards The shared mem ory is then arbitrated and buffered through the Time Base Controller inter face hardware This hardware decodes and latches the Time Base Controlier address and generates a wait signal that holds the Time Base Controller processor in a wait state until a bus cycle can be granted to aliow the memory access to complete The arbitration logic coordinates requests for access to the shared memory from the A D converters the Acquisition system processor and the Time Base Controliler processor Microprocessor The microprocessor controls the Acquisition system which has 64 Kbytes of EPROM for code storage 16 Kbytes of shared RAM and 8 Kbytes of un shared RAM The microprocessor calibrates and manages the programma ble gain amplifiers and measurement hardware The microprocessor also accepts and executes commands from the Time
75. Acquisition processor the Time Base processor attempts to communicate with the Executive processor Likewise the Dis play processor attempts to communicate with the Executive processor after successfully executing its Kernel diagnostics After a processor has successfully completed its Kernel diagnostics and established communications with the next order processor for example Acquisition to Time Base and Time Base to Executive then the Self Test diagnostics execute to verify the more global functionality of the processor s hardware system After all the Self Test diagnostics are executed any faii ures cause the oscilloscope to enter Extended Diagnostics and to display the error index codes in a diagnostic menu Extended diagnostics contains tests which are a superset of the Self Test The Kernel diagnostics low level Self Test diagnostics and Self Test Extended Diagnostics produce and format error index codes differently so they are covered separately Kernel diagnostics error index codes for each subsystem are produced and read quite differently from each other Note that some of these tests that may indicate faulty FRU s are not exe cuted automatically during the Self Test diagnostics that is some errors codes are only generated by manually selecting tests or Extended Diagnostics 6 79 Diagnostic Troubleshooting Kernel Diagnostics Kernel diagnostics are executed each time the front pane ON STANDBY switch is set
76. BOWERS AVE SANTA CLARA CA 95051 SALES OFFICE ST4 2 5Y400 TRIAX METAL PRODUCTS INC 1800 276TH AVE NW HILLSBORO OR 97124 6629 DIV OF BEAVERTON PARTS MFG CO 50579 SIEMENS COMPONENTS INC 19000 HOMESTEAD RD CUPERTINO CA 95014 0712 OPTOELECTRONICS DIV 52814 TECH ETCH INC 45 ALDRIN RD PLYMOUTH MA 02360 53387 MINNESOTA MINING MFG CO PO BOX 2963 AUSTIN TX 78769 2963 61058 MATSUSHITA ELECTRIC CORP OF ONE PANASONIC WAY SECAUCUS NJ 07094 2917 AMERICA PO BOX 1502 PANASONIC INDUSTRIAL CO DIV 61857 SAN 0 INDUSTRIAL CORP 85 ORVILLE DR BOHEMIA LONG ISLAND NY PO BOX 511 11716 2501 66302 VLSI TECHNOLOGY INC 1109 MCKAY DR SAN JOSE CA 95131 1706 71400 BUSSMANN 114 OLD STATE RD ST LOUIS MO 63178 DiV OF COOPER INDUSTRIES INC PO BOX 14460 75915 LITTELFUSE INC 800 E NORTHWEST HWY DES PLAINES IL 60016 3049 SUB TRACOR INC 78188 ILLINOIS TOOL WORKS INC ST CHARLES ROAD ELGIN iL 60120 SHAKEPROOF DIV 80009 TEKTRONIX INC 14750 SW KARL BRAUN DR BEAVERTON OR 97077 0001 PO BOX 500 83385 MICRODOT MFG INC 3221 W BIG BEAVER RD TROY MI 48098 GREER CENTRAL DIV 83486 ELCO INDUSTRIES INC 1101 SAMUELSON RD ROCKFORD IL 61101 83553 ASSOCIATED SPRING BARNES GROUP 15001 S BROADWAY GARDENA CA 90248 1819 INC 11801B Service Manual P O BOX 231 10 5 Replaceable Parts CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mfr Man ufacturer Address City State Zip Code Code 85480 BRADY W H CO 2221 W CAMDEN RD MILWAUKEE WI 53209 CORP H Q PO BOX 2131 INDUSTRIAL P
77. Base Controller processor and manages the sampling head digital and analog controls including scanning the front panel SELECT buttons on the sampling head and driving the front panel LEDs 3 29 Block Diagram Descriptions 3 30 Theory of Operation Performance Verification This section contains procedures to check electrical specifications and examine measurement limits listed in Table 4 1 Use these procedures to check the oscilloscope operation following repair To functionally test the oscilloscope simply perform the procedures listed in Table 4 1 which have a yes indication in the Functional Test column The Specifications or Meas urement Limits are given at the beginning of each procedure Adjustment procedures are included in the Adjustment section Refer to the 178078 Digital Sampling Oscilloscope User Manual tor more information about oscilloscope specifications and operation The Setup in each procedure provides information concerning test equipment setup or interconnection Refer to Table 4 2 for more information concerning test equipment used in the setups Most Performance Verification and Adjustment procedures can be run in any order However the Sampling Head Calibration must always precede other procedures which use an operational sampling head i e does not apply to parts using the Calibration Head Also if a different sampling head is used then a sampling head calibration is required for each additional sa
78. COAX 17 5 L 9 3 TK2469 ORDER BY DESC FROM A19J33B TP A1J33B 174 0751 00 1 CABLE ASSY RF 50 OHM COAX 34 0 L 9 7 TK2469 ORDER BY DESC FROM A1J17 TO A6J17 174 0827 00 1 CABLE ASSY HF 50 OHM COAX 17 5 L 9 03 TK2469 ORDER BY DESC FROM A1J33A TO A19J33A 174 1557 00 1 CA ASSY SPELEC 8 22 AWG 4 12 5L 4 11 125L TK1967 ORDER BY DESC FROM A10J74 TO ENCODERS S74 AND 975 174 1559 00 1 CA ASSY SBELEC 8 26 AWG 12 0L TK1967 ORDER BY DESC FROM A7J56 TO A8J56 174 1560 00 1 CA ASSY SPELEC 4 26 AWG 21 0 i RIBBON TK1967 ORDER BY DESC FROM A4J57 TO A8457 174 1561 00 1 CA ASSY SP RIBBON CPR 3 26 AWG 9 0 L TK1967 ORDER BY DESC FROM A8452 TO A15J52 174 1743 00 1 CA ASSY PWR DESCRETE PSC 4 18 AWG 18 5 L TK1967 ORDER BY DESC FROM A2A2J63 TO A13J63A 174 1744 00 1 CA ASSY SPELEC 50 28 AWG 1K1547 ORDER BY DESC FROM A10J72 TO A14J72 174 2030 00 1 CABLE ASSY RF 50 OHM COAX 5 0 L W BL JKT TK2338 174 2030 00 FROM A5488 TO FRONT PANEL J88 174 2031 06 1 CABLE ASSYRF 50 OHM COAX 6 5 L W BLUE JKT TK2338 174 2031 00 FROM A4J87 TO FRONT PANEL J87 174 1426 00 1 CA ASSY SPELEC 34 26 AWQG 8 0 L 80009 174142600 FROM A5J18 TO A1J18 175 9803 00 3 CA ASSY SP RIBBON CPR 7 26 AWG 7 5 L TK1967 ORDER BY DESC FROM A2A2465 TO A4J65 FROM A7J53 TO A15J453 FROM A5J16 TO A116 10 16 Mechanical Parts List Fig amp Tektronix Serial No Index Part No Effective Dscont No 175 9814 00 1
79. Cx DG RAE e on 6 103 CRT A7 CRT Socket Board or A8 CRT Driver Board 6 104 ATS Mother Board lais a GAL vA ese ER EAE QE Ra i CR wn 6 104 Fuse TOSIN Bhanna kr COLUCHE UICE A JR QN 6 105 Time Base Calibration Errors lessen 6 108 Acquisition Calibration Errors eere 6 110 Options UBBONS oriundi E eaa SOL SENE qe Padus E UA 7 1 Instrument Options lsseeeeseera hh mh 7 1 Power Cord Information lleeeseeeee enne 7 2 Electrical Parts List bipcirical PANS doe NU 139 Cae dC neal Nc Od oa acd Ea gus nde 8 1 ADT ATI NR TANTO LE RN D LS Vi PUE TA AW La Ea dq ems e m s Aet bd teet ip Contents Table of Contis Diagrams Block DIAGFAMS prarijo E wet arene teins 9 1 System Block Diagram eee nn 9 2 Board Level Block Diagrams seeeeeeeeeee 9 9 Replaceable Parts List Replaceable Parts seoeeeeee eee nnn 10 1 Parts Ordering Information een 10 1 Using the Replaceable Parts List eeeeleeese 10 2 11801B Service Manual Table of Contents Contents ia Shier List of Figures Figure 2 1 Sampling Head Compartments in the 11801B Digital Sampling Oscilloscope i us cs obere REDE SE S ab c OR 2 2 Figure 2 2 Power Cord Plug Identification esee 2 5 Figure 3 1 Trigger Edge Siew Rate for High Frequency Selection 3 10 Figure 4 1 A26 M F Acquisition Interconnect Board Test Po
80. EL CIRCUIT BD ASSY TOUCH PANEL NOT REPLACEABLE ORDER 614 0916 XX PUSH BUTTON 0 269 X 0 409 ABS SCREW MACHINE 4 40 X 0 312 PNH STL SCREW MACHINE 6 32 X 0 25 PNH STL SUBPANEL FRONT FINISHED SCREW MACHINE 6 32 X 0 375 PNH STL BAR SUPPORT CRT SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 TERM GIK DISC 0 250 SPADE STUD MT MALE ELECTRON TUBE CRT COLOR V130 WASHER LOCK 76 INTL 0 018 THK STL SCREW MACHINE 6 32 X 0 312 FLH STL ENCODER DIGITAL INCREMENTAL 50PPR CIRCUIT BD ASSY FRONT PANEL BUTTON SEE A11 EXCHANGE ITEM SHLD GSKTELEK SOLID TYPE 1 66 L SCR ASSEM WSHR 4 40 X 0 437 PNH STL T10 SWITCH ROCKER SPST 30MA 12V STRABTIEDOWN E 0 098 W X 4 0 L ZYTEL PANEL FRONT UPPER LIGHT INDICATOR SV GREEN INCANDECENT CABLE ASSY RF 50 OHM COAX 30 0 L 9 8 NUT PLASSEM WA 4 40 X 0 25 STL SHLD GSKT ELEK SOLID TYPE 2 28 L NUT PLAIN HEX 0 25 32 X 0 375 BRS TERMINAL LUG 0 26 iD LOCKING BRS TINNED TERMINAL LUG 0 391 ID LOCKING BRS RES FXD FILM 1M OHM 596 0 25W R89 ADAPTER CONN SMA TO PELTOLA SHLD GSKT ELEK SOLID TYPE 7 646 L PANEL FRONT 11801B LOWER WASHER SHLDR 0 255 X 0 375 X 0 105 THK NYL JACK TIP BANANA CHARCOAL GRAY NUT PLAIN HEX M9 X 0 75 SHAFT EXTENSION 1 833 L ALUMINUM PUSH BUTTON 0 269 X 0 409 ABS CONTACTELEC GROUND CU BE SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 Mfr Code 80009 OJROS TK1163 93907 OKBO1 TK1916 OKBO1 5Y400 OKBO1 00779 90482 78189 OKBO1 TK18
81. EN and BLUE cutoff adjustments a CONVERGENCE adjustment See Figure 9 6 for a block diagram of this board Red Green and Blue Video Amplifiers These three circuits are identical high speed video amplifiers that drive the three cathodes R G and B red green and blue respectively of the CRT Each of the three colors can be programmed to display 64 different levels This yields a possible 262 144 colors of which eight can be displayed on the screen at any time Red Green and Blue Adjustments These three potentiometers control the cutoff point that is the point at which a certain color becomes invisible Convergence Adjustment This potentiometer controls the vertical convergence of the red green and blue deflection beams Theory of Operation A8 CRT Driver Board 11801B Service Manual Block Diagram Descriptions The A8 CRT Driver board consists of the following circuits m Horizontal sweep circuitry a Vertical sweep circuitry w High voltage and grid voltage generator circuitry amp Degauss circuit Beam current limit circuit m Grid bias circuit The A8 CRT Driver board circuitry drives the raster scan CRT The VIDEO and SYNC signals from the A15 MMU board generate the Z axis signal sweep signals and grid bias voltages for the CRT See Figure 9 7 for a block diagram of this board Horizontal Sweep This circuit generates the sweep current for the horizontal deflection yoke The horizontal driver inclu
82. EST IMAN Set only DIAG Query oniy The TEST command invokes Self Test diagnostics or Extended Diagnostic execution The TEST command without arguments initiates Self Test diag nostics The TEST command with argument XTND initiates Extended Diag nostics Refer to the CSA 803A and 11801B Digital Sampling Oscilloscope Program mer Manual tor more information on TEST and DIAG command syntax and usage The return of one of two event codes listed in Table 6 7 to the GPIB and RS 232 C ports signals that diagnostic testing is complete Tabie 6 7 Event Code Descriptions Event Code Explanation 460 Self Test or Extended Diagnostics were completed successfully 394 Self Test or Extended Diagnostics were completed and failed In either case a GPIB RS 232 C controller may obtain pass fail information through the DIAG query The TEST command with argument MAN initiates the Extended Diagnostics similarly to entering Extended Diagnostics through the front panel UTILITY menu The primary use of this command is to provide the remote operator a convenient way of accessing the diagnostics through the normal RS 232 C interface so that the operator can use the Diagnostic Terminal Mode to do remote testing CAUTION The TEST command with argument MAN violates normal GPIB protocols in that when used the instrument becomes non respon sive to further GPIB commands until normal operation is resumed 11801B Service Manual 6 87 Diagno
83. Fan Housing and Rear Panel Connector Plate 6 16 Maintenance Corrective Maintenance J70 481 J65 Power Supply Module Rear J64 J63 J66 J62 Figure 6 3 A2A2 Control Rectifier Board Connector Locations To remove the Power Supply module from the oscilloscope proceed as follows C Step 1 Turn the instrument on its left side as viewed facing the rear panel The Power Supply module will now be at the bottom of the instrument C Step 2 Remove the eight Torx head screws that secure the power supply module Step 3 Carefully pull the Power Supply module partially out of the instrument Do not stretch taut or bind the wires attached to the A2A2 Control Rectifier board connectors To prevent damage to the connector pins pull the Power Supply module only partially out of the instrument 11801B Service Manual 6 17 Corrective Maintenance 6 18 C Step 4 Remove the wire connectors from the pins on the A2A2 Control Rectifier board C Step 5 Remove the chassis ground green yellow wire that is con nected to the Power Supply module from the chassis of the instrument Step 6 Remove the Power Supply module To replace the Power Supply module perform the previous steps in the reverse order NOTE Align the metal guides on the top of the Power Supply module with the grooves inside the upper part of the opening in the instrument Be careful not to pinch any wires or interconnecting cables while
84. G SEE A27 EXCHANGE ITEM FRAME SECT CAB MODULE GUIDE CKT BD UPPER PP7 0 L SCREW MACHINE 4 40 X 0 25 FLH STL T 8 FRAME SECT CAB MODULE TERM QiK DISC 0 187 X 0 02 BLADE 45 DEG SCREW TPG TR 6 32 X 0 5 PNH STI GUIDE CKT BD PLASTIOC 2 5 L PLATE REAR ALUMINUM CIRCUIT BD ASSY STROBE TDR BUFFER SEE A19 EXCHANGE ITEM SCR ASSEM WSHR 4 40 X 0 312 PNH STL T10 CIRCUIT BD ASSY M F ACQUISITION INTCON SEE A26 EXCHANGE ITEM BRACKET CKT BD MODULE DISCONNECT AL FRAME SECT CAB MODULE SUPPORT CKT BD PLASTIC SCREW MACHINE 6 32 X 0 312 FLH STL BAR LOCKING MPI FRAME SECT CAB MODULE ROD LOCKING 0 25 SST CIRCUIT BD ASSY HEAD INTERCONNECT SEE A20 A21 A22 A23 EXCHANGE ITEMS NUT PL ASSEM WA 8 32 X 0 344 STIL SKT PL IN ELEK 3 5 X 3 5 X 1 86 ALUMINUM SCREW MACHINE 4 40 X 0 312 PNH STL SHLD GSKTELEK FINGER TYPE 4 734 L STUD LOCKING 0 850 X 0 188 HEX SST PANEL FRONT GUIDE PLUG IN PO 3 167 L SUBPANEL FRONT 7 94 X 4 988 AL Mfr Code 80009 80009 80009 80009 80009 TK1465 TK1905 93907 TK1465 00779 83385 18677 TK1943 80009 93907 80009 TK1943 80009 TK1163 OKBO1 5Y400 TK1465 TK0588 80009 OKBO1 TK1916 93907 TK1465 TK0588 TK2072 TK1302 TK1943 Mfr Part No 657009000 670936301 670936404 670936301 670936404 426 2167 00 ORDER BY DESC ORDER BY DESC 426 2168 00 61664 1 ORDER BY DESC 11633 1 ORDER BY DESC 671290900 829 0
85. IB and RS 232 C interfaces that help process data and help contro the rest of the instrument The memory management unit MMU arbitrates requests for access to the Waveform Memory from the following three sources m the EXP m the Time Base Controller m the display system This arbitration allows all three systems transparent access to the Waveform Memory Waveform Memory Block Waveform Memory is shared among the following three processors m the EXP m the Display m the Time Base Controller While the main function of the Waveform Memory is the storage of waveform data and waveform related information the shared memory is also used to pass messages between the Executive Display and Time Base Controller processors Eventually all acquired waveforms are transferred from the Acquisition system memory to the Waveform Memory for display Theory of Operation Front Panel Controls I O Block Waveform Compressor and Display Control Block 11801B Service Manual System Functional Overview User control of the oscilloscope is primarily through the following three front panel controls mw the front panel major menu buttons m the touch panel m the multifunction knobs The major menu buttons are the top level menu selections for the instru ment Touching an icon menu item or waveform selects that particular icon menu item or waveform respectively The multifunction knobs control the function of the particular i
86. IN MOLDING SHARP CORP BEAVERTON PARTS MFG CO AMLAN INC MOORE ELECTRONICS INC DIST RAN ROB INC CRAFT FACTORY PLASTICS NEDELCO BV THOMAS amp BETTS PHILIPS NEDERLAND BV AFD ELONCO ALPS PUGET CORP OF OREGON SKS DIE CASTING CO NEILSEN MANUFACTURING INC SYNDETEK PRECISION DECORATORS INC HAWTHORNE BUSINESS CENTER QUALTEK ELECTRONICS CORP FAN S DIV INDUSTRIAL GASKET INC ACC MATERIALS MEC IMEX INCORPORATED UNITREK CORPORATION ELECTRIi CORD MFG CO INC TRIQUEST CORP COMTEK MANUFACTURING OF OREGON METALS Address 72 VERONICA AVE UNIT 4 2015 SECOND STREET 4300 S RACINE AVE 635 NW 16TH 1775 NW 216TH 3400 OLYMPIC STREET 9898 SW TIGARD ST 606 SECOND STREET 22 22 NAGAIKE CHO ABENO KU 1800 NW 216TH AVE 97 THORNWOOD RD 19500 SW 90TH COURT PO BOX 1030 631 85TH AVE 17145 SW ALEXANDER POSTBUS 6431 POSTBUS 90050 100 N CNTRE AVE 7440 S W BONITA 2200 4TH 3501 PORTLAND ROAD NE 3915 E MAIN 5289 NE ELAM YOUNG PARKWAY SUITE G400 7158 INDUSTRIAL PARK BLVD 1623 SE 6TH AVE ED SNYDER BLDG 38 302 6TH FLOOR 162 CHANG AN E ROAD SEC 2 3000 LEWIS amp CLARK WAY SUITE 2 312 EAST MAIN ST 3000 LEWIS AND CLARK HWY PO BOX 4200 City State Zip Code TOKYO JAPAN SUMMERSET NJ 08873 BERKELEY CA 94170 CHICAGO IL 60608 3320 PORTLAND OR 97209 2206 HILLSBORO OR 7123 SPRINGFIELD OR 97477 TIGARD OR 97223 BERTHOUD CO 80513 OSAKA JAPAN HILLSBORO OR 97124 6629
87. IY a W ened Gi ol bs Gn Soe e amp avr vov T e TO WNY l NOLLISIN IY vor m rTP BOCK OFM DOM etrr e DOM OV mas SSNNDOHSILNT LOANNODYSL H2 Bag QUOYM sr C37 ATAM KS EV oavaa L2SNNOOHAUINI QV 3H ccv D duae GHD QV3H Lov ao c m L tara Qv3H LINA N ILI SIDOJOV veer DBP Yy Guvog oer wasdna Qi 38DMIS vec v amp ga T x v t amp Q Til nur 3 Hol eadouls EINANS ZAL aagoais cCON33S 9 9 0 09 0 0 0 0 0 O0 0 0 Jv ger Yer REC ger VEC 298 gae Ver SIF gio VIC e Ignugw 991M9 GLOSLL NIAM LU M wd M nia GE HO LOSNNDS THYERA Ol Quvos 3718v2J ON Q sf 3 46 ad al D HE ar 5 Is x suigiDeid yoojg S 6 X quoD weeg Suilgeo xoorg pered WLOSLE z 6 einBi4 gaar Saar aaen Veer aver ster nm atar Vier oer onar acer voor Ind Lng A302 IVNBSLINI HOAviudr va ANO AF ido WORINOA TT WS d3NVd uY25 ANI HA991NL p oavoe SAIN SBOMLS eer OS Oe i Been G e MOL E Tw T FATAR i SET OQ SEP ST rsgaH IENYd iNONZ i A teas eer eal Wt EON NOT L23NNQ2 JILVASilNY NVd NH san T E 2Q aser gsar g Qe or gsar v QO ssar eser I a OO var
88. If the vertical raster lines are visible in the background then adjust SCREEN so that the background is just cut off but the bottom gray box is still visible Step 31 Touch Exit to return to the Extended Diagnostic menu struc ture C Step 32 Touch Red Display and then touch Run G Step 33 Examine the red display for any severe color impurities Step 34 Touch Exit to return to the Extended Diagnostics menu structure 7 Step 35 Touch Green Disply and then touch Run L Step 36 Examine the green display for any severe color impurities 3 Step 37 Touch Exit to return to the Extended Diagnostic menu struc ture Step 38 Touch Blue Display and then touch Run C Step 39 Examine the blue display for any severe color impurities Adjustment Procedures Adjusimenis C Step 40 If any of the color displays that is the Red Display Green Disply or Blue Display showed severe color impurities then perform the following to restore the color purity B Ensure that the oscilloscope environment is free of all external magnetic fields For example a magnetic screwdriver near the oscilloscope could cause color impurities on the screen Set the ON STANDBY switch to STANDBY u Wait 10 seconds then set the ON STANDBY switch to ON m Examine the color displays again and verify that the color impurities are removed NOTE When the oscilloscope is moved in the earth s magnetic field color impurities will ap
89. Peer aes Menu Selections and Measurement Techniques User A mmmmamammrmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmHa Performance RLL mham iy saa ex ROO E eR eo ROCR QE RUE LR OR eis Power On Diagnostics seseeeeee hh nnn IBS S os esito ioc orn Ste sede deli Scu odo aed cae a Sel rest DIGCOSUOCS 1i vcr Rr e Qu aan Rec ea enaa Power On Diagnostics Complete llluusue Sampling Heads 4 ooo koe CR deba cen ER CORE ACI ERI esis Extended Diagnostics eeleee eese nnne Vertical Reference Voltage eeeeeeeeeeee ee eee eere Horizontal Reference Clock ccc eee cannes Vertical Accuracy iuseexka 9 Rx else eee eae ee ee ee a ceana System Vertical RMS Noise 0cccee cence cn eeeaees Sweep Rate Accuracy lesse eee hr nnn THO Ing iouis pota oe Ee oa Aera d AG So oed ee EA Internal Clock mmmmmmmmkcuirmr Calibrator OuIDUL oserei err anal e RE E ae S AdilusImaents 25 zooms he Sr PIRA RAI D ua CERRAR ROC RA D ES Test EQUIDMGHE 2299 oy OE ac AERE ACIE CORSA ECC Using These Procedures esee rennen Conventions in this Manual essen Menu Selections and Measurement Techniques USEF MLB gles iocos betonte oed dic ec CE ERE dubia POWEI SUDDIV iex RERO ERES Rok dq a Ko d d EROR ISDA Cuba ao cd A a heme rebate Heal Hime ClOCK ios esie ks eap pack rix E EVA ERE Er 4 1 4 3 4 6 4 11 4 11 4 11 4 11 4 13
90. RDER BY DESC ORDER BY DESC 671001300 ORDER BY DESC 129 1085 00 829 07510 024 3475 4 3341 189 ORDER BY DESC 386 5369 02 122 NN 2500 060 ORDER BY DESC ORDER BY DESC ORDER BY DESC CPNY 172BK ORDER BY DESC ORDER BY DESC 214 4082 00 ORDER BY DESC ORDER BY DESC ORDER BY DESC 119458900 2096 ORDER BY DESC ORDER BY DESC 343004000 ORDER BY DESC TY244M ORDER BY DESC N5 01 29 0124D 386158900 ORDER BY DESC 670884701 ORDER BY DESC Mechanical Parts List Replaceabie Parts las 7 N SA a Jo v Rear i Figure 10 3 Chassis 10 13 11801B Service Manual Replaceable Parts Fig amp Index No LE DRE SS SS PRE POP I EC la a ica a TET E TT SC Sr incon hea rea aT CIRCUIT BOARDS 10 4 1 146 0055 00 2 BATTERY DRY 3 0V 1200 MAH LITHIUM 61058 BR 2 3A E2P BT130 BT150 2 159 0245 00 4 FUSE WIRE LEAD 1A 125V FAST 71400 TH MCR 1 F200 F600 F602 F800 3 156 3a812 00 1 IC PROCESSOR HMOS MICROPROCESSOR 34649 H80286 10 U830 156 3821 00 1 IC PROCESSOR NMOS PERIPHERBRAL 50579 SAB82258A 1N U800 4 156 2622 00 1 IC ASIC HMOS SEMI CUSTOM STD CELL 66302 VF4157RC CCO0001 U330 5 671 1129 00 1 CIRCUIT BD ASSY MOTHER 80009 671112900 SEE A13 EXCHANGE ITEM G 211 0722 00 1 SCREW MACHINE 6 32 X 0 25 PNH STL OKBO1 ORDER BY DESC 7 670 9655 01 1 CIRCUIT BD ASSY REGULATOR 80009 670965501 SEE
91. RE GUIO iyare an ela wr arie adco eee a VES Su n press Measurement in major menu sssee es touch Period in pop up menu s sse n touch Exit Menu in pop up menu 0 0 0 0 eee eee touch Step 10 Examine that the period is between 18 172 ns and 18 192 ns showing that sweep rate accuracy is within 0 05 11801B Service Manual 4 35 Performance Tests Sweep Rate Accuracy 1 ns div I Step 11 Adjust the Sweep Rate to 1 ns div PIOUZOM al e CON ode dd ex ex abc nee caw en aed rani touch Set Main Size to 1 ns div Step 12 Adjust the Signal Generator to the following settings PICQUCIOY MP RT 110 MHz AMO UGO PM c Kae 1 0 Vans L Step 13 Press the UTILITY button and adjust the lower knob for a display showing a full waveform Step 14 Press the MEASURE button and check for a period interval between 9 083 ns and 9 098 ns showing that sweep rate accuracy is within 0 08 Sweep Rate Accuracy 100 ps div C Step 15 Use the upper control knob to adjust the Main Size to 100 ps div Step 16 Adjust the Signal Generator to the following settings FOGUS octo ebvam cse Fear Rag ad MEO hehe OE ES 1 1 GHz pelo MDC 2 0 Vp p 1 4 Vrms Set for 1 000 V 0 004 Vp p on screen C Step 17 Press the UTILITY button and adjust the lower knob for a display showing a full waveform C Step 18 Press the MEASURE button and check for a period interval between
92. RODUCTS DIV 93907 TEXTRON INC 600 18TH AVE ROCKFORD iL 61108 5187 CAMCAR DIV 10 6 Mechanical Parts List Replaceable Parts 11801B Service Manual 10 7 Replaceable Parts Fig amp Tekironix Serial No Qty 12345 Name amp Description Mfr Mfr Part No index Part No Effective Dscont Code No CABINET 10 1 1 200 2191 00 2 CAP RETAINER PLASTIC OJRO5 ORDER BY DESC 2 357 0248 01 1 HANDLE CARRYING 16 344 L W CLIP TKi465 ORDER BY DESC 211 0718 00 2 SCREW MACHINE 6 32 X 0 312 FLH STL OKBOi ORDER BY DESC 212 0681 00 4 SCREW MACHINE 10 32 X 0 25 PNH STL 83486 MACHINE SCREW 5 426 2088 01 1 FRAME SECLCAB LEFT SIDE TK1465 ORDER BY DESC 6 211 0721 00 8 SCREW MACHINE 6 32 X 0 375 PNH STL OoKBOi ORDER BY DESC 7 101 0106 00 4 TRIM DECORATIVE LEFT SIDE FRONT CASTING TK1163 ORDER BY DESC B8 426 2099 01 1 FRAME SECT CAB RIGHT SIDE TK1465 ORDER BY DESC 9 348 0886 00 4 SHLD GSKT ELEK FINGER TYPE 18 310 L TK1159 ORDER BY DESC 10 348 0879 00 4 FOOT CABINET DBOTTOM BLUE POLYCARB TK1163 ORDER BY DESC 11 348 0596 00 PAD CAB FOOCTO 69 X 0 255 X 0 06 PU TK2122 348 0596 00 12 348 0875 00 1 FLIPSTAND CAB TKO488 ORDER BY DESC 13 211 0 11 00 4 SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 OKBOi ORDER BY DESC 14 a14 06603 02 8 PIN ASSY SECRG W SPRING WASHER 0J260 ORDER BY DESC 15 386 0227 00 8 STOPCLPRIM CL ACETAL OJHOS 386 0227 00 16 386
93. Rear Plate Fan Housing Connect Board and Rear Panel Connector Plate 0 0 0 0 eee eee 6 16 Figure 6 3 A2A2 Control Rectifier Board Connectors Locations 6 17 Figure 6 9 Removing Replacing the A4 Regulator Board 6 33 Figure 6 10 Hemoving Replacing the A5 Time Base Controller Board sco Eau E E VC dada t X s 6 36 Figure 6 19 Removing Replacing the A14 I O Board 6 50 Figure 6 23 Removing Replacing the A19 Strobe TDR BUT Sr Boa s qa vadis Bare eA nd a dodo e RR KU e UAR 6 58 6 8 Maintenance Corrective Maintenance Table 6 2 FRU Removal Replacement Figure Cross Reference Cont FRU to be Removed Replaced A4 Regulator Board i A5 Time Base Controller Board A7 CRT Socket Board A8 CRT Driver Board A9 Touch Pane Assembly Ad 0 Front Panel Control Board A11 Front Panel Button Board A12 Rear Panel Assembly 11801B Service Manual Figure 6 2 Figures to Reference During Removal Figure 6 3 Figure 6 9 Figure 6 32 Figure 6 10 Figure 6 32 Figure 6 11 Figure 6 32 Figure 6 5 Figure 6 12 Figure 6 15 Figure 6 32 Figure 6 5 Figure 6 15 Figure 6 32 Figure 6 5 Figure 6 15 Figure 6 32 Figure 6 5 Figure 6 15 Figure 6 16 Figure 6 32 Figure 6 5 Figure 6 17 Figure 6 32 Removing the Power Supply Rear Piate Fan Housing and Rear Panel Connector Plate sseeeeeeeeaeeena 6 16 A2A2 Control Rectifier Board Connectors Locations 6 17 Rem
94. Removing Replacing the A7 CRT Socket Board 6 38 Figure 6 12 Removing Replacing the A8 CRT Driver Board 6 39 Figure 6 13 A9 Touch Panel Assembly Torx Head Screws 6 41 Figure 6 14 Removing Replacing the A9 Touch Panel Assembly 6 41 Figure 6 15 Removing Replacing the A10 Front Panel Control Bodlt otras etic C qtio S mane WENT d anda Vo oM Roc etia dre 6 43 Figure 6 16 Removing Replacing the A11 Front Panel Button EOS ous sais hehe dae a bas paite dard EAR Duda ducat dra 6 44 Figure 6 17 Removing Replacing the A12 Rear Panel Assembly 6 46 Figure 6 18 Removing Replacing the A13 Mother Board 6 48 Figure 6 19 Removing Replacing the A14 I O Board 6 50 Figure 6 20 Removing Replacing the A15 MMU Board 6 52 Figure 6 21 Removing Replacing the A17 Executive Processor mo ny osu terme oe TT OO TI IMP 6 54 Figure 6 22 Removing Replacing the A18 Memory Board 6 56 11801B Service Manual D du LIS of Figures Figure 6 23 Removing Replacing the A19 Strobe TDR Buffer EOS eee ee eee ae er ere ey See ee eee eee ee Et ee don 6 58 Figure 6 24 Removing Repiacing the A20 A23 Head Interconnect Boards scias paco e CH OCURRE CU calde se e e a 6 59 Figure 6 25 Hemoving RHeplacing the Front Subpanel Assembly 6 60 Figure 6 26 Removing Replacing the A26 M F Acquisition IHtSrCOr Bc E BOA vos xoa S ode eed Er ec ee ao ird Eo abd apa 6 61 Figure 6 27 Top View of the A26 Mainf
95. Service Manual Tektronix 11801B Digital Sampling Oscilloscope 070 8781 00 Warning The servicing instructions are for tse by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to per forming service Please check for change information at fie rear of this manual First Printing March 1993 instrument Serial Numbers Each Jesti iment manufactured by Tektronix has a serial number on a panel insert or tag or stamped on the ML 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 i ited States have six unique digits The country of manufacture is identified as follows ji ii BOT 10000 Tektronix Inc Beaverton Oregon USA i gat E200000 Tektronix United Kingdom Ltd London anis cn Sony Tektronix Japan lt H700000 Tektronix Holland NV Heerenveen The Netherlands _ fosttuments manufactured for Tektroni syrexternal vendors outside the United States are assigned a two digit alphaycode to identify the country of manufacture e g JP for Japan HK for Hong Kong IL for Israel etc E P Inc PO Box 500 Beaverton OR 97077 i Pihet in U S A _ Bapyright Tektronix inc 1993 All rights reserved Tektronix products are covered by U S a
96. Set the Main Size to 10 ps div adjust upper knob F Step 27 Activate the cursors as follows CUISOISACON 25 spen cci Das dad od SR n Od facte id touch C Step 28 Read the Av located in the major menu Av should be within 260 5 mV and 248 1 mV or 248 1 mV and 4260 5 mV showing that the sweep rate accuracy is within 2 596 C Step 29 Touch Exit in the major menu Sweep Rate Accuracy 1 ps div Step 30 Adjust the Signal Generator to the following settings mici wr adeen tether eet Lae ieee mea metes 800 MHz AIMDINUGE uci teaseectcre tales iem yee 2 0 Vp p 1 4 Vams Set for 1 000 V 0 004 Vp p on screen C Step 31 Invoke smoothing as follows WAVEFORM MUOR codd Cep SO bU ba E ER ete Yates press Sampling Head Fnc s in major menu seeee nee touch Smoothing On in pop up menu 2 eee touch Exit m Dop Up MENU eriten er EX AR OY Dabei ete he S ego touch _ Step 32 Adjust the Main Size to 130 ps div C Step 33 Adjust the Main Pos to 55 ns Step 34 Set the Main Pos control lower knob so that the zero cross ing of the waveform occurs on the center graticule 11801B Service Manual 4 37 Performance Tests Step 35 Set the horizontal reference point to Center as follows so that the waveform will be expanded around the horizontal center WAVEFORM DUTON dia ac cao ER e Re do COR DO Ie ras press Horizontal Desc in major menu 200 cee touch Center in pop
97. TDR CRT Driver board A8 TOUCH Touch Pane assembly A9 FPCTRL Front Panel Control board A10 FPBUT Front Panel Button board A11 REAR Rear Panel assembly A12 MOTHER Mother board A13 IO Input Output board A14 MMU Memory Management Unit board A15 EXP Executive Processor board A17 MEM Memory board A18 STROBEBUF Strobe TDR Buffer board A19 HEAD Head Interconnect board A20 A23 ACQANALOG Acquisition Analog board A24 A27 ACQMPU Acquisition MPU board A25 A28 MFACQCON M F Acquisition Interconnect board A26 Maintenance 11801B Service Manual Diagnostic Troubleshooting Component and Module Name Abbreviations Abbreviations of component and module names are listed in Table 6 9 Table 6 9 Component Module FRUs FRU Board CRT Cathode Ray Tube FW Executive Display Time Base or Acquisition Firmware SDI Serial Data interface IC BATTERY Lithium Battery PS Power Supply Module NOTE The Executive Display Time Base and Acquisition firmware is packaged in a single firmware FW kit the individual parts are not available as separate components 6 93 Diagnostic Troubleshooting Executive Subsystem Error index Codes es Error index codes for the Executive subsystem are listed in Table 6 10 along with the suspected FRUs Bit patterns for these hexadecimal error index codes are displayed with the front panel MENUS LEDs in bottom to top bit order The STORE RECALL label represents the MSB most
98. X Tektronix P6106A Alignment Tool Plastic hex Tektronix Part 003 0301 00 Insulated slot Tektronix Part 003 0675 01 oquare Tip Tektronix Part 003 1400 00 ceramic Magnetic Screw Holder for Torx Tektronix Part 003 0293 00 driver head tips Torx Head Screw 10 tip Tektronix Part 003 0814 00 driver 15 tip Tektronix Part 003 0966 00 20 tip Tektronix Part 003 0866 00 Mad MM t 4 4 Performance Verification TP 11801B Service Manua Performance Verification Table 4 2 Test Equipment Cont Description Minimum Examples of Applicable Specification Test Equipment Sih il a ET TTT OTS DOP Eea A AI TI C ET ET FTE ATE EE PEPPER ERY YET NEI SEA T A aa ET BT EP TEC EON External Loopback RS 232 C Tektronix Part 013 0198 00 Connector connector Shorting Strap two alligator clips on a short pigtail conductor Integrated Circuit IC Insertion Extrac General Tool P N U505BG or Extracting Tool tion Pliers 28 pin equivalent type Board Removal Straight siot screw Tools driver large Torx drive screw driver T7 F8 1 10 7 15 1 20 T 25 Allen hex Wrench 1 16 inch Nutdrivers 3 16 inch 1 4 inch 7 16 inch Needie nose pliers Small Ruler half inch rulings Antistatic wrist strap Tektronix Part 006 3415 04 4 5 Performance Verification 4 6 Test Record Photocopy the next four pages and use them to record the performance test results f
99. adjusted 7 Step 23 Touch Exit to return to the Routine menu of the Extended Diagnostic menu structure C Step 24 Touch Gray Scale in the Routine menu 7 Step 25 Touch Run in the major menu 11801B Service Manual 5 15 Adjustments 5 16 7 Step 26 Examine that the color scale is white at the top gray at the bottom and the background on the right side of the display is cut off that is the vertical raster lines are not visible on the right side of the display If the gray scale meets the previous conditions do not perform the adjustments in Steps 27 28 and 30 Proceed to Step 31 Q 7 Step 27 Adjust Red R200 Green R201 and Blue R203 on the A7 CRT Socket board fully counterclockwise 1 Step 28 Adjust SCREEN located on the transformer that is mounted on the A8 CRT Driver board so that the bottom block of the gray scale is visible but the background on the right side of the display is still cut off a Step 29 Note which color red green or blue appears most promi nently in the display DO NOT adjust this color in the following step Step 30 Adjust RED R200 GREEN R201 or BLUE R203 on the A7 CRT Socket board for a pure white to gray scale display Only adjust the colors that do not appear prominent For example if the display appears to be more red then adjust the GREEN and BLUE potentiometers NOTE SCREEN may have to be adjusted slightly if any of the colors are adjusted
100. align with tic marks VERT SIZE L321 and VERT Position POS R311 for optimum alignment Horizontal Size align with tic marks and for H SIZE R501 H LIN R502 Linearity and optimum and H POS R500 for Position appearance optimum alignment and linearity Gray Scale white at the top of the SCREEN on transformer on display and gray at the A8 CRT Driver board RED bottom and the right side of R200 GREEN R201 and the display is cut off BLUE R203 for cutoff and color balance Color impurity no severe color impurities in cycle power on and off red green and blue display Real Time Clock 1 000 000 us 5 ps Real Time Clock for 1 000 000 us messe EC C mmarated e sawM NIE EE D E nee 5 2 Adjustment Procedures Test Equipment Adjustments Table 5 2 Test Equipment contains suggested test equipment for use in this manual Procedure steps are based on the test equipment examples given but you may substitute other equipment with similar specifications The use of different equipment may alter test results setup information and related connectors and adapters Table 5 2 Test Equipment Description Minimum Examples of Applicable Specification Test Equipment High Frequency 10 MHz to 10 GHz WILTRON 67598 Opt 2 Sine Wave Genera tor sampling Head SD Series SD 24 and any other Tektronix SD Series Sampling Head except SD 14 Digital Voltmeter lt 0 005 Accuracy FLUKE 8842A Digital Voltmeter w
101. are identified by using the built in FRU help function Help described under Self Test Extended Diagnostics The FRU s in the Suspect board category in the following error index tables are listed in maost to least probable cause order If any diagnostic errors occur inspect the suspect FRU for loose connections and components Then repeat the Diagnostic test l any diagnostic errors occur again re place the suspect FRU s with a known good FRU or FRUs Check that the new FRU is configured exactly like the old one and that any installed firm ware matches the version in the old FRU The error index codes and tests are divided into four groups based on the four processor subsystems Executive Display Time Base and Acquisition Each subsystem group has a table of kernel diagnostic error index codes In addition the Executive has a table of manual test error index codes which help extend the confidence level of instrument functionality If necessary kernel error index codes for the Executive and Display subsys tems can be read using a logic probe as TTL logic levels on circuit board pins 6 91 Diagnostic Troubleshooting 6 92 FRU Name Abbreviations Abbreviations of FRU names are listed in Table 6 8 Table 6 8 Board FRUs FRU Board Board No STROBEDR M F Strobe Driver board A1 MFPOWERR M F Power Connect board A3 REG Regulator board A4 TBC Time Base Controlier board A5 CRTSOC CRT Socket board A7 CR
102. arking Symbols in Manuais Static Sensitive Devices Symbols on Equipment 7 AN DANGER Protective ATTENTION High Voltage ground earth Refer to terminal manual XV Safety Summary Specific Precautions Observe all of the following precautions to ensure your personal safety and to prevent damage to your 11801B or the equipment connected to it Power Source This product is intended to operate from a power source that will not apply more than 250 Vnus between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Grounding the Product This product is grounded through the grounding conductor of the instru ment power cord To avoid electric shock plug the power cord into a prop erly wired receptacle before connecting to the product input or output terminal A protective ground connection by way of the grounding conduc tor in the power cord is essential for safe operation 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 electrical shock Do Not Operate in Explosive Atmospheres ed To avoid expiosion do not operate this product in an atmosphere of explo sive gasses Do Not Service Alone Do not perform internal service or adjustment o
103. atch in the external cabling or in the internal cables that distribute the strobe The repositioning is done with the strobe deskew voltages which are DC control voltages found on jumper J34 Power is also supplied to this board through this jumper The strobe deskew voltages are generated on the A1 M F Strobe Drive board and are controlled by the microprocessor on the A5 Time Base Controller board The sampling strobe alignment is checked by routing the strobe sense signals to the A5 Time Base Controlier board where the microprocessor measures and adjusts the time alignment of each sampling head TDR Buffer and Level Shift This circuitry consists of an ECL buffer and four dual transistors that level shift the TDR signal for proper drive of the TDR step generators in the sam pling heads A20 23 Head The A20 A23 Head Interconnect boards provide the interface between the sampling head connectors J11 J12 J13 J14 the ribbon cable W150 and Interconnect Boards the coaxial cables W100 and W200 W150 connects to the A26 M F Acouisi tion Interface board and carries the control status and power W100 and W200 connect to the A24 A27 Acquisition Analog board and carry the sig nals from the sampling heads 3 26 Theory of Operation A26 M F Acquisition Interconnect Board A24 A27 amp A25 A28 Acquisition System Boards 11801B Service Manual Block Diagram Descriptions The A26 M F Acquisition Interconnect board provides and distribute
104. atteries give your emergency care provider the following information amp Manufacturer Panasonic e Battery Type Lithium Poly Carbon monoflouride BH 2 3 A w Solvent electrolyte Gama Butyriactone is of low toxicity It can cause some eye and respiratory irritation According to the manufacturer the solvent may be released during venting Venting is an out gassing of battery material This is usually caused by short circuiting tor more than a few seconds or by overheating Solute LIBF4 Tabie 6 3 lists the emergency procedures to follow should you come in contact with battery solvent Table 6 3 Emergency Procedures for Contact with Battery Solvent Contact Do This Skin Wash promptly with plenty of water Eyes Flush immediately with plenty of water and use an emer gency eye wash if availabie Report to a medical profes sional for treatment Inhalation Leave the area and get fresh air Report to a medical professional for treatment ingestion Non toxic according to laboratory testing However re port to a medical professional for advice In case of venting clear the immediate area Venting will usually last only a few seconds 6 28 Maintenance Corrective Maintenance FRU Board and Pin connectors are for electrical interconnection with chassis mounted components and other boards Most boards assemblies in the instrument Assembly Removal are mounted on the chassis The following four boar
105. bit matrix This display RAM is scanned column by column automatically lighting the appropriate LED bar s when a high bit is encountered The coarse fine LEDs are driven by a latch which is controlled by the EXP The coarse fine selections are sensed on the A9 Touch Panel board The A12 Rear Panel assembly links the oscilloscope to other devices This assembly contains connectors for the following devices a One GPIB Port One RS 232 C Port m One Printer Port Centronics style The A12 Rear Panel assembly is controlled from the A14 Input Output I O board through a 40 wire cable This cable carries the following signals m Ejight bit bidirectional data bus a Four bit address bus m Four interrupt lines m GPIB DMA request and grant lines w Four device control lines w Assorted power supply and ground lines See Figure 9 8 for a block diagram of this assembly 3 15 Block Diagram Descriptions GPIB Data and Address Bus This bus drives the GPIB controller directly Control signals DBIN and WR are used by the GPIB controller to determine if the microprocessor is trying to read from or write to it The interrupt controllers in the A17 Executive Processor board monitor this interrupt line and will signal the microproces sor to service the GPIB controlier in order to communicate with the micro processor the GPIB controller requires that at least one of the nme conditions occurs m ihe receiver section of the GPIB controlle
106. board Use extreme caution when performing the following adjustment C Step 15 Adjust CONVERGENCE R210 on the A7 CRT Socket board for the optimum vertical convergence of the red green and blue colors C Step 16 Examine that the grid pattern is focused Step 17 Adjust FOCUS located on the transformer mounted on the A8 CRT Driver board for the optimum focus of the white grid pattern C Step 18 Examine that the grid is aligned with the top and bottom tic marks along the inside vertical edge of the front panel bezel To elimi nate any parallax error look directly ahead at the CRT and then align the top of the grid with the top vertical tic mark and the bottom of the grid with the bottom tic mark Step 19 Adjust VERT SIZE L321 and VERT POS R311 on the A8 CRT Driver board to align the grid with the tic marks along the inside vertical edge of the front panel bezel Step 20 Examine that the grid is aligned with the horizontal tic marks at the top and bottom of the front pane bezel and that the grid boxes are of uniform length throughout the grid pattern 7 Step 21 Adjust H SIZE R501 H LIN R502 and H POS R500 on the A8 CRT Driver board for best overall linearity and position Use the horizontal tic marks at the top and bottom of the front pane bezel to align the grid Step 22 H SIZE H LIN and H POS potentiometers interact so you may need to repeat Steps 20 and 21 until they are ali correctly
107. cage boards the A18 Memory board uses the 15 V supply to operate the NVRAM circuitry The information above and Table 6 17 will heip you to identify a failure of one of these fuses If a test fails then check the fuses WARNING Using a replacement fuse with an incorrect current rating may cause the ribbon cables to melt and create fire danger during a component fault 11801B Service Manual 6 105 Other Troubleshooting 6 706 See Figures 6 2 and 6 37 for the location of the line fuse and the A14 I O board fuses respectively When a fuse must be replaced unsolder the fuse from the board Be careful not to damage the soider pads on the board it may be helpful to straighten the fuse leads on the rear of the board before removing the leads from their holes in the circuit board Refer to the Parts List section for the correct value and part number of each fuse Table 6 17 A14 I O Board Fuse Failures Fuse Executive Kernel Test Failure Self Test Extended Test Failure refer to Table 6 10 Executive Subsystem Error Index Codes F200 1044 GPIB Interrupt open F800 1344 Front Panel Inter od Note The front panel lights do not work so the code must be read from the error status test points TP200 TP205 on the A17 Executive Processor board F600 Passes the Kernel diagnostic Exec Control E1411 3 Open tests but the front panel lights NVRAM E1411 3 are not lit Battery E1411 1 Data Lines E1421 1 Addr Data E1431
108. cal Reference Voltage 7 Step 1 Initialize the oscilloscope settings as follows UTER Y DURON 1e oni tira A E aD Sr do dea cR 6 pedo RP Ron ces press Initialize in major menu 0 ce eee touch initialize in verification pop up menu 00 touch C Step 2 Connect the Digital Voltmeter to the 5 V reference point and GND on the A26 Mainframe M F Acquisition Interconnect board See Figure 4 1 C Step 3 Set the Voltmeter for DC Voltage and check for a reading of 5 V 200 uV 7 Step 4 Connect the Digital Voltmeter to the 5 V reference point and GND on the A26 M F Acquisition Interconnect board 118018 Service Manual 4 21 Performance Tests LJ Step 5 Set the Voltmeter for DC Voltage and check for a reading of 5V 200 uV if the readings noted in Steps 3 and 5 are outside the stated limits then servicing of the oscilloscope is required before continuing to the Horizontal Reference Clock procedure ur A AALBTTMBRPDPDS IIT n ig ae Qisesasusasnusasi ce eerscereecgeccsersceceunnnnnnaee 5 5 GND _ Test Points Figure 4 1 A26 M F Acquisition Interconnect Board Test Point Locations 4 22 Performance Verification Mene Performance Tests Horizontal This procedure verifies the correct operation and accuracy of the oscillo Reference Clock scope s horizontal reference clock see Figure 4 2 This procedure shoul
109. cedure listed under Power Supply Module Removal Replacement in the Mainte nance section c Create a short between test points TP830 and TP831 on the A2A2 Control Rectifier board using a shorting strap See Figure 5 2 d Connect the oscilloscope Power Supply module to a suitable line power source e Set the rear panel PRINCIPAL POWER SWITCH to ON C Step 2 With the Digital Voltmeter set to DC Voltage and connected as indicated in the setup diagram check that the multimeter reads within the limits of 5 15 and 5 25 V DO NOT attempt to change the following 5 2 V Ref setting if the reading is within the stated limits Proceed to Step 4 To prevent electric shock use extreme caution when making the following adjustment 11801B Service Manual 5 9 Adjustments Step 3 Adjust the 5 2 V Ref R800 on the A2A2 Control Rectifier board to 5 20 V Step 4 Remove the Digital Voltmeter leads from the test points Step 5 Set the rear panel PRINCIPAL POWER SWITCH to OFF Step 6 Disconnect the oscilloscope from the power source C Step 7 Remove all test leads and the TP830 831 shorting strap Step 8 Replace the Power Supply module using the instructions in the Maintenance section Step 9 Set the rear panel PRINCIPAL POWER SWITCH to ON and the front panel ON STANDBY switch to ON R800 5 2V REF TP701 TP221 Is Is amp s TP831 TP830 Figure 5 2 A2A2 Control Rectifie
110. cilloscope entered the norma operating mode without any diagnos tic failures perform the following steps to enter the Extended Diagnostics mode No inputs or I O cables should be attached to the oscilloscope for these tests Procedure to Invoke Extended Diagnostics L Step 1 With the sampling head installed as illustrated check initial conditions as follows Set the oscilloscope ON STANDBY switch to ON press Check sampling head Select button is OFF visually check indicator You may lose stored settings stored traces or other data stored in NVRAM by turning the power off that is setting the ON STANDBY switch to STANDBY or the PRINCIPAL POWER SWITCH to OFF during the execution of the Extended Diagnostic tests that deal with the Executive processor s NVRAM tests However this does not seriously affect oscilloscope operation Select ine D EIETEN OUROM 9a oti ater pon ee cate CU e doa press Page to Enhanced Accuracy in major menu touch Page to Utility2 in major menu lisse touch Extended Diagnostic in major menu touch Extended Diagnostic in pop up menu touch Select All and then Run to start the tests touch 11801B Service Manual 4 19 Performance Tests Step 2 Check that all tests have executed and have a Pass status Then make the following selections in the order shown Executive if not already highlighted see ech ee
111. connected through the grounding conductor of the power cord to the grounded earth contact of the power plug Any interruption of the grounding connection can create an electri cal shock hazard The power input plug must be inserted only in a mating receptacle with a grounding contact where earth ground has been verified by a qualified service person Do not defeat the grounding connection AC POWER SOURCE AND CONNECTION An improper voltage supply can damage the instrument The instrument operates from a single phase power source It has a three wire power cord and two pole three terminal grounding type plug The voltage to ground earth from either pole of the power source must not exceed the maximum rated operating voltage 250 V Before making connection to the power source check that the LINE VOLTAGE SELECTOR is set to match the voltage of the power source and has a suitable two pole three terminal grounding type plug 2 4 Operating Information Operating Information Power Cord A power cord with appropriate plug configuration is supplied with each api instrument Table 2 1 Power Cord Conductor identification gives the color Information coding of the conductors in the power cord If you require a power cord other than the one supplied refer to Figure 2 2 Power Cord Plug Identification Table 2 1 Power Cord Conductor Identification Conductor Color Alternate Color Ungrounded Line Brown Black Grounded
112. contain severe color impurities 5 13 Adjustments Setup to Examine Adjust the Display 11801B fe Luu Procedure to Examine Adjust the Display To prevent electric shock use extreme caution when performing the following adjustment _ Step 1 Perform the following settings in the order listed 11801B ON STADIDIBY exce utto s dentine tue ev IDEEN STANDBY Step 2 Remove the top and bottom cabinet panel covers C Step 3 Remove the three screws that secure the CRT cover and then remove the cover _ Step 4 Remove the two screws that secure the cover that shields the A7 CRT Socket board CRT Socket board cover C Step 5 Set the ON STANDBY switch to ON Step 6 Examine that the display is visible L Step 7 Adjust SCREEN located on the transformer mounted to the A8 CRT Driver board clockwise until the display appears Step 8 Press the UTILITY button C Step 9 Touch Extended Diagnostic then touch Extended Diagnostic in the Verify Diagnostics pop up menu Step 10 Touch Block and then Front Panel C Step 11 Touch Area and then Test Pattern C Step 12 Touch Routine and then White Grid 5 14 Adjustment Procedures BOTTLE Adjustmenis Step 13 Touch Run in the major menu Step 14 Examine that the primary colors red green and blue are not separated in the white grid pattern To prevent electric shock do not touch the back side of the A7 CRT Socket
113. ctions provided in this man ual to remove and replace it The removal and immediate replacement of the faulty FRU allows a minimum of downtime for the user The Parts List section gives a complete list of the FRUs in this instrument First time users are encouraged to read the 11801B Digital Sampling Oscil loscope User Manual This will help you to learn the basic functions of the 11801B This section contains information about installing and removing a sampling head applying power proper environmental conditions shipping the instru ment and instrument options Operating Information Sampling Head Installation and Removal To avoid damage to the oscilloscope set the ON STANDBY switch to STANDBY before installing or removing sampling heads CAUTION Applying a voltage outside the range printed on the sampling head can result in damage Static electricity is also a hazard The input diodes used in the sampling heads are very susceptible to dam age from overdrive signal or DC voltages and from electrostatic discharge Never apply a voltage outside the range printed on the front of the sampling head Operate the 11801B only in a static controlled environment Connect the wrist strap provided with the 11801B to the ANTISTATIC CON NECTION as shown in Figure 2 1 Refer to the 178078 Digital Sampling Oscilloscope User Manual for more information The SD Series sampling head slides into one of the front panel compart ments of
114. d internal maintrame acquisition measurement channel 1 Use the following steps to verify the vertical accuracy through internal acquisition measurement channel 2 using trace 2 Don t remove Voltage Source from Calibration Head Channel 2 _ Step 12 Initialize the mainframe as follows DUE Y DUEOD C vere TL press Initialize in major menu seeeeeee eee touch Initialize in verification pop up menu sssssse touch Step 13 Trigger the oscilloscope as follows TRIGGER DURO er OE Dern Ck UU seta edens press Source in major meri oss xe e Eee x PRATER touch Internal Clock in pop up menu usuesssuss touch 11801B Service Manual 4 27 Performance Tests C Step 14 Define the first trace as follows EGE ir COU acter Wicca oc ieee ee ot ee ee eee touch Identity Channel D isses 4449445456454 Ree Rea touch Select Enter Desc ccc cece es touch Note that Trace 1 has been selected at the base of the screen just above M1 Main Step 15 Define the second trace as follows Der ir Eois immmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmiiimrrm m Ie touch Identify Channel 2 er eeee nee ease ee ee ee nm touch Select Enter Desc 0 0 0 00 ccc eee ee ae ea II touch Note that Trace 2 has now been selected at the base of the screen just above M2 Main Step 16 Repeat Steps 5 through 12 7 Step 17 Power down the oscilloscope Repeat Steps 1 through 16 for al
115. d 45V ese Reset Reset Reset Data PWR Up um Reset Latched Select Buffer Enabie Executive Numeric DMA Bank Date Bus Data Processor w Executive Processor Buffer S Ext en sion E w System Le E EX EL mm Da s Bus io Min m Ml He uten d SRDY Address Bus INTO INT12 oe Executive IR From A14 UO Controllers Nu System Control Bus Address par Address l Decode To Co microprocessor DMA R G To A14 IO Select bed Interrupt Control Co microprocessor Interrupt Control Data Buffer Enabie Bank Switch SRDY WAIT REQ RDY 7 J77 wat 1WAT Ts wat SRDY Pulp and State 2 WAIT i MuR Inverter Decoder 4 WAIT 7 Wait SRDY Figure 9 11 A17 Executive Processor Board Block Diagram 11801B Service Manual 9 75 Block Diagrams Address Data Non Voiatile Ram Address Battery Latches Backup Address Decode Memory Memory Data Buffers and Memory Select Wait State Wait State Generator Diagnostics P106 Mother Board Connector Configuration Readback Figure 9 12 A18 Memory Board Block Diagram HOES PS a AREA AMAA Harder PP SSS RU a SSSA rir hss AAMAS 9 16 Diagrams Block Diagrams A5 Time Base Controller Board Id Strobe Sense Select Strobe Sense Sampling Head Strobe Sense J1A J2A J3A J4A AN Strobe Sense ES I J29A J30A Strobe i
116. d m m m m m s s 11801B Service Manual 4 11 Performance Verification Mummim m mum m m m mmanniaililiiliiiliiliiiliilillllili iiiuuuu UU E ARIA e HH HH HP REP UU Ahr aaa imma 4 12 Performance Verification 11801B Service Manual Performance Tests This section contains the procedures to check the electrical specifications and examine the measurement limits listed in Table 4 1 To functionally test the oscilloscope simply perform the procedures which have a yes indica tion in the Functional column The Specifications or Measurement Limits are given at the beginning of each procedure Adjustment procedures are included in the Adjustment section Refer to the 778078 Digital Oscilloscope User Manual for more information about oscilloscope operation The Setup in each procedure provides information concerning test equipment setup or interconnection Refer to Table 4 2 for more information concerning test equipment used in the setups 4 13 Performance Tests Power On Diagnostics This procedure should be performed within the ambient temperature range of 18 C to 28 C 64 F to 82 F when a performance check at peak operating conditions is required Setup to Invoke Power On Diagnostics 11801B pease Me RUE SD series sampling head o anm not installed yet Procedure to invoke Power On Diagnostics Applyi
117. d only be performed if maintenance is required This procedure is not necessary for verifying instrument specifications Specifications The operational frequency specification for the horizontal reference clock is 200 000 kHz 5 kHz Setup to Check Horizontal Reference Clock 11801B fu LLLLLL Frequency Counter To Pin 9 10X Probe A5 Time Base of U191 Controller Board See Figure 4 2 pu Procedure to Check Horizontal Reference Clock 7 Step 1 Initialize the oscilloscope settings as follows UTE DURON 3 su diera wa Sarai adt EAE ord e n hanla ce press Initialize in major menu essen touch Initialize in verification pop up menu touch Step 2 Perform the following 11801B operations in the order listed mu Set the front panel ON STANDBY switch to STANDBY gm Setthe oscilloscope on its right side as viewed from facing the front of the oscilloscope a Set the oscilloscope front panel ON STANDBY switch to ON 11801B Service Manual 4 23 Performance Tests C Step 3 Set the Frequency Counter controls output as follows a Frequency counter MODE CDS Frequency A AIGOSEP tata tetas diam tria Le 1 6x m deron o ee Seats AC SIODS sacs ette ebbe Su Ci neha ede gees one positive AUGHUBUDIL cid itid de owed ob UA TOR E RU ect dto heat 1X if LS ai DP 1MQ Step 4 At U191 on the A5 Time Base Controller board touch the 10X Probe to pin 9 and the ground probe
118. des 6 98 Table 6 14 Display Processor Status LED Configuration 6 98 Table 6 15 Time Base Processor Kernel Error Index Codes 6 100 Table 6 16 Acquisition Processor Kernel Error Index Codes 6 102 Table 6 17 A14 V O Board Fuse Failures 00 002 0000 6 106 Table 6 18 Time Base Calibration Errors 2 0 c eee eee 6 109 Table 7 1 Power Cord Conductor Identification 7 2 Table 10 12 Board FAUS LS asa rab nC Re enda dares 10 3 11801B Service Manual xi List of Tabies a s XIV Contents Symbols and Terms 11801B Service Manual Safety Summary This general safety information is directed to operators and service person nel Specific warnings and cautions will be found throughout the manual where they apply but may not appear in this summary Several safety related symbols and terms appear in the manuals and on the equioment Terms in Manuals CAUTION statements in manuals identify conditions or practices that couid 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 acces sible as one reads the m
119. des an oscillator a voltage ramp generator a high gain amplifier and a flyback generator These components provide sweep synchronization horizontal deflection and linearity The horizontal adjustments H SIZE H POS and H LIN allow you to opti mize the appearance of the display Vertical Sweep This circuit produces a deflection current that sweeps the video beam from the bottom to the top of the CRT This circuit also produces a flyback signal for the flyback transformer that is in parallel with the deflection yoke The vertical adjustments VERT SIZE and VERT POS set the vertical size and position of the display High Voltage and Grid Voltage Generator This circuit includes the flyback transformer which generates the 16 kV CRT anode potential and other bias voltages This transformer is coupled and synchronized with the vertical deflection system The SCREEN adjustment provides the cutoff point that is the point where no information is visible on the display screen The FOCUS adiustment provides manual focusing of the display image MENAPA DOODO DOODIA ADNO AA DAANA AAAA ANH pU AAAA AULEM DSS EPHRAIM LL aapa irri HMM ooo 0o 3 13 Block Diagram Descriptions Degauss This circuit removes magnetic fields from the color steel aperture grille These magnetic fields are induced at each power on by magnetic sources The Degauss circuit produces an exponentially decaying sine wave with a frequency of approximately
120. dress and enables the data buffers if the address is on this board or on the A24 A27 amp A25 A28 Acquisi tion system boards controlled through this board The function decoder also selects the appropriate direction of the data buffers to perform a read or write operation Internal Clock Rate Generator This circuit is a 16 bit programmable counter that is tied to the 2 flip flop which produces the square wave output The overall division ratio of this block can be programmed from 2 to 217 The internal clock rate generator is programmed at power on to provide a 100 kHz output given a 4 MHz input on jumper J35 Block Diagram Descriptions A3 M F Power Connect Board Control Buffer This circuit buffers the control signals sent to the A1 M F Strobe Drive board from the A5 Time Base Controller board The A3 M F Power Connector board consists of built in connectors that connect the power supply voltages from the A4 Regulator board to the following boards z Ai M F Strobe Drive board A5 Time Base Controlier board A26 M F Acquisition Interconnect board The A3 M F Power Connect board also supplies 15 V power to the A14 Input Output I O board through a 16 pin ribbon cable A4 Regulator Board 3 8 The regulators convert semi regulated voltages into stabilized low rippie output voltages The A4 Regulator board consists of the following regulators and the voltage fault detect circuitry E 50V m 15V
121. ds plug onto the top of the A13 Mother board see Figure 6 7 for the location of these boards in the card cage m A14 Input Output MO m Ai5 Memory Management Unit MMU m A17 Executive Processor EXP u A18 Memory The following two boards plug onto the A26 M F Acquisition Interconnect board See Figure 6 1 for the locations of these boards in the Acquisition unit m A24 A27 Acquisition Analog m A25 A28 Acquisition MPU Feed through connectors join the plug on boards to the A13 Mother board and the A26 M F Acquisition Interconnect board To minimize the chance of static charge damage to the integrated circuits and or related circuitry after removing a board from the instrument place it on a grounded antistatic surface Some components that are mounted on a board must be retained for use with the new assembly These components would include interconnecting plugs support posts and some wiring 11801B Service Manual 6 29 Corrective Maintenance A15 Memory Management Plastic Board Unit MMU Guides J57 J52 LE bus a E d SL J7 M e d BEN J77 si So Ir dm E e am i A Y n Rear Panel A18 A14 A17 Memory input Output Executive Processor I O EXP 4 Rear of Oscilloscope Figure 6 7 Top View of the Card Cage 6 30 Maintenance Corrective Maintenance A1 M F Strobe Drive Board Removal and replacement steps are listed below See Figures 6
122. e self tests to assure continuous accuracy of waveform data and measure ments digital waveform storage and display on board measurement capabilities menu driven touch screen operation RS 232 C GPIB and PRINTER interfaces This section has two main sub sections System Functional Overview describes the major functional blocks of the 11801B and presents a typical waveform processing cycle Block Diagram Descriptions discusses the individual boards in the 11801B FER emery mmr aap dd dM MM MO mm 11801B Service Manual 3 1 Theory of Operation Theory of Operation System Functional Overview This section describes and illustrates the major functional blocks of the 11801B see Figure 9 1 Acquisition System The 11801B contains two identical Acquisition systems Each Acquisition Block system supports two dual channel sampling heads for four overall channeis However each Acquisition system contains only two physical channels that can be used for data acquisition and measurement Since each Acquisition system supports four input channels two dual channel heads but contains only two acquisition measurement channels the four input channels are multiplexed into the two acquisition measure ment channels through analog multipiexers Any one of the four sampling head input channels can be independently connected to either of the two acquisition measurement channels Several calibration signals are also supplied to each
123. e Wave 4 Generator aul Ca Output Trigger input a Q 50 N Coaxial Cables ON Procedure to Check Triggering Power Divider g Step 1 Instali the SD 24 Sampling Head into the position shown in the setup diagram CH 1 CH 2 slot l the unit was in standby mode set the ON STANDBY switch to ON C Step 2 Initialize the mainframe as follows OTERI DUNG oera Aa Se Ee E eae press initialize in major menu eeeeeeeeeeeeeeeeeeeena touch Initialize in verification pop up menu ssveeeeeeeee touch C Step 3 Adjust the high frequency generator as follows 400 MVp p at 300 MHz C Step 4 On the Sampling Head press the Channel 1 select button 4 39 Performance Tests Step 5 Make the following selections AUTOSE T OUNON a dod ca Cod n dca ae ede tios press slightly adjust the Trigger Level in TRIGGER major menu if necessary MEASURE DISOR etu e rECRERE E EE o tse pt pas press Measurement in major menu 0 0 0 ess touch Peak Peak in pop up menu suusveeeeeeeeee ee ee touch WAVEFORM DEOS Lus Id ne con dicem Rates ee in ais card Dress Sampling Head Fnc s TALL al a A rc ETE touch Smoothing On in pop up menu sss esses touch Exit n pop up MENU carar ERG qe be KR en ete CR eo A touch C Step 6 Check waveform for stable triggering Using AUTOSET repeat procedure for the following frequency generator settings 400 mV at 1000 MHz 400 mV s p at 3 0 GHz 4 40
124. e instrument enters Extended Diagnostics On the test terminal type T to display the EX TENDED DIAGNOSTICS menu on the terminal display If the displayed errors are only for the front panel touch screen then the CRT the A7 CRT Socket board or the AB CRT Driver board is at fault Note any other errors and use Table 6 5 earlier in this section to identify the suspect subsystem A13 Mother Board 6 104 This board is implicitly verified that is if all the other FRUs pass diagnostic testing then you can assume that the A13 Mother board is operating cor rectly as well Maintenance Fuse Testing Other Troubleshooting The A14 I O board has four fuses see Figure 6 37 F200 supplies 5 V to the A12 Rear Pane board F800 supplies 5 V to the A10 Front Panel Con trol board and the A9 Touch Panel board F600 supplies 15 V to the A14 I O board card cage A10 Front Panel Control board A9 Touch Panel board A11 Front Panel Button board and A12 Rear Panel board reduced to 12 V F602 supplies 15 V to the A14 I O board card cage A10 Front Panel Control board reduced to 5 V and A12 Hear Panel board reduced to 12 V F200 supplies 5 V to the A12 Rear Panel board If diagnostics report failure of all three ports RS 232 C GPIB and PRINTER then this fuse is the probable suspect assuming that the ribbon cable to the A12 Hear Panel board is connected When tested with a multimeter this fuse should measure le
125. e ne net Beezeeseunenaeeqvuet Torx Head Screws 6 Figure 6 27 Top View of the A26 Mainframe Acquisition Interconnect Board 6 62 Maintenance Corrective Maintenance A24 A27 Acquisition Analog Boards Removal and replacement steps are listed below See Figures 6 23 6 26 6 28 and 6 32 for board guide screw and index locations 1 Step 1 Remove the Acquisition unit and place the Acquisition unit in the upright position Step 2 Remove the two Torx head screws on each black retaining brace located at the top of the Acquisition unit remove these braces _ Step 3 Remove connectors J41 J42 J43 and J44 from the A24 A27 Acquisition Analog board Step 4 Pull up on the hinged white tabs until the board separates from connector P6 To replace the A24 A27 Acquisition Analog board perform the previous steps in reverse order NOTE insert the edges of the board into the plastic guides Lower the board into position Check that connector is seated onto the A26 M F Acquisition Inter connect board connector Push down firmly on the A24 A27 Acqui sition Analog board to seat this connector on the A26 M F Acquisition Interconnect board J41 J42 J43 J44 P5 6 to A26 M F Acquisition interconnect Board Connector Figure 6 28 Removing Replacing the A24 A27 Acquisition Analog Boards 11801B Service Manual 6 63 Corrective Maintenance A25 A28 Acquisition MPU Boards Removai and replacement steps are list
126. ead to the chassis again refer to Step 6 Step 6 Use a non conducting tool to pry up the anode lead cap This rubber cap is located on the upper part of the CRT behind the front casting Using a non conducting tool release the spring clip inside the cap and remove the anode Insert one blade of a pair of needle nose pliers against the anode and touch the other blade to the top of the front casting to ground the anode to the chassis Step 7 Remove the single Torx head screw that secures the A8 CRT Driver board to the instrument chassis Use either of the following meth ods to remove the Torx head screw m Remove the Torx head screw with a very short handled 1 15 Torx head screwdriver Ensure that you do not strike the CRT while removing the screw m Remove the A10 Front Pane Control board Then use a Torx head screwdriver that has an extension length inserted in it to remove the Torx head screw Access the screw from the hole in the left side of the instrument chassis Ensure that you do not strike the CRT while removing the screw 6 37 Corrective Maintenance a Step 8 Remove the single Torx head screw that secures the transform er on the A8 CRT Driver board to the instrument chasis This screw is iocated at the rear of the transformer The A8 CRT Driver board is now not attached to the instrument chassis C Step 9 Remove connectors J52 J56 and J57 from the A8 CRT Driver board Note the position of the multi pin connecto
127. ear Panel Assembly Block Diagram 9 13 Figure 9 9 A14 I O Board Block Diagram 00005 9 14 Figure 9 10 A15 MMU Board Block Diagram 6 9 14 Figure 9 11 A17 Executive Processor Board Block Diagram 9 15 Figure 9 12 A18 Memory Board Block Diagram 9 16 Figure 9 13 A19 Strobe TDR Buffer Board Block Diagram 9 17 Figure 9 14 A26 M F Acquisition Interconnect Board Block Bii PET CMT EEE a OE O 9 17 Figure 9 15 A24 A27 Acquisition Analog Board Block Diagram 9 18 Figure 9 16 A25 A28 Acquisition MPU Board Block Diagram 9 18 FOWE 10 1 CADNO sais ur ebria eta weer AEA x C E e Ah 10 9 FOWE TO TEEOPIE FAIL ics acce Enea de ERE e E RERE v3 10 11 Figure 10 4 Chassis Rear Luce rx px ed 4042S RC ACE CASE ROO oe ACER ra 10 13 Figure 10 4 Circuit Boards Lacs oed e eR RET REV ER CREE SE Ar 10 15 Figure 10 5 Acquisition Module eee en ne nnn nn 10 19 T Contents Figure 10 6 Power Supply List of Figures ORS ee re ee ere eee 10 23 Figure 10 7 ODOTIN oratia soos tte someone eaten wees 10 25 Figuro 10 6 ACCESSES Ld cre unre Wine neha ao ghar decida 10 27 11801B Service Manual xi List of Figures Contents List of Tables Table 1 1 Measurement Limits Specifications Adjustments and Functional Tesis ii rd das oan neha ie Re sued RES d 1 1 Table 2 1 Power Cord Conductor Identification 2 5 Table 4 1 M
128. easurement Limits Specifications and Functional TOSS oos hs eee ehhh dado diodes G s etd ae EE uo SU EE ere 4 1 Table 4 2 Test Equipment soeur rerin arein KAAN E ss 4 3 Table 4 3 Voltage Source Settings 0 ee cece eee eee 4 27 Table 4 4 Vertical Offset Test Values 0 cece eee ee eee 4 30 Table 4 5 Sensitivity Settings oor erem ey emn a 4 33 Table 5 1 Measurement Limits and Adjustments 5 2 Table 5 2 Test Eauinmeht ost ume tru boe Ae CI ee pA 5 3 Table 6 1 Relative Susceptibility to Damage from Static DISCHBECIBS des deis rie eiae ab UR RU EUIS e Su Sect e S sedate eae ed 6 6 Table 6 2 FRU Removal Replacement Figure Cross Reference 6 8 Table 6 3 Emergency Procedures for Contact with Battery OUS o aoi erra Cour uio Supe io idt Jue diu d teca ni ois 6 28 Table 6 4 Checks Required After FRU Replacement 6 77 Table 6 5 Extended Diagnostics Error index Code Descriptions 6 82 Table 6 6 System Mode Commands sseee ees 6 87 Table 6 7 Event Code Descriptions s esses eee 6 87 Tabla 5 8 Board FRAUS ios ads aye e DEI CIR AO Re RU ES 6 92 Table 6 9 Component Module FRUS s esses 6 93 Table 6 10 Executive Processor Kernel Error Index Codes 6 94 Table 6 11 Executive Processor Status LED Configuration 6 95 Table 6 12 Executive Processor Manual Tests 6 96 Table 6 13 Display Processor Kernel Error index Co
129. ecution marks on items that is blocks areas or routines below the currently selected menu name down to the Routine level The execution mark if present will change from an asterisk or minus to a space e D Debugger normally cannot be selected and is used by qualified service personnel only E Exit terminates Extended Diagnostics and returns the instrument to normal operating mode but only if this selector is touched twice in succession The first touch causes a confirmation prompt to appear at the top of the screen the second touch causes the actual termination of the Extended Diagnostics um p Loop toggles On and Off When On the selected test s is exe cuted continuously with the number of iterations displayed m t Terse toggles On and Off When On tests in the loop mode exe cute at the fastest rate but the iteration i e Loop readout is not up dated until the test is stopped by touching the screen or a button a x All toggies On and Off When On all tests in the current menu are selected to execute when started s Stop on Err toggles On and Off When On testing stops after the first failed test completes a rRun q Quit starts or stops the currently selected tests 11801B Service Manual 6 83 Diagnostic Troubleshooting LEM Diagnostic Menus The upper portion of the display screen is used to display diagnostic menus Menus are comprised of menu items a
130. ed below See Figures 6 23 6 26 6 29 and 6 32 for board guide screw and index locations a Step 1 Remove the Acquisition unit and place it in the upright position Step 2 Remove the two Torx head screws on each black retaining brace located at the top of the Acquisition unit remove these braces C Step 3 Pull up on the hinged white tabs until the board separates from connector P8 on the A26 M F Acquisition Interconnect board To replace the A25 A28 Acquisition MPU board perform the previous steps in reverse order NOTE insert the edges of the board into the plastic guides Lower the board into position Check that the connector is seated onto the A26 M F Acquisition interconnect board connector Push down firmly on the A25 A28 Acquisition MPU board to seat this connector on the A26 M F Acquisition Interconnect board P7 8 to A26 M F Acquisition interconnect Board Connector Figure 6 29 Removing Replacing the A25 A28 Acquisition MPU Boards 6 64 Maintenance Corrective Maintenance FRU IC Removal The procedures for removing and replacing the FRU ICs in the oscilloscope are outlined in this section Serial Data Interface Integrated Circuits Slam Pack ICs U330 is mounted on the A14 I O board See Figure 6 30 for the location of this IC It has a raised ridged heat sink cover The IC is oriented to its socket by a beveled corner The other corners are notched to fit the edges of the socket The beve
131. edures refer to the Adjustment section for Adjustment procedures Table 1 1 Measurement Limits Specifications Adjustments and Functional Tests Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Fen ven nrvvwnv wT ve eves BM A AASE ea aata ERE ERR RF EF PRAE ARMAR E ER ER E ERN RAM MMC MED A A NT ZU RNC tien Power On Diagnostics none none none yes Sampling Head none none none yes Extended Diagnostics none none none yes Power Supply no Voltage supply 4 85 V to none none 5 25 V Voltage Reference 5 15 V to none R800 45 2 V Ref 5 25 V for 5 20 V Regulator Reference 9 95 V to none R730 4 10 V Ref 10 05 V for 10 00 V Display Cutoff visible none SCREEN on no transformer on A8 CRT Driver board until display appears Convergence primary colors are not none CONVERGENCE no separated in the white R210 for grid optimum convergence of red green and blue Focus focused grid pattern none FOCUS on no transformer on A8 CRT Driver board for optimum focus on white grid pattern 11801B Service Manual 1 1 Specifications Table 1 1 Measurement Limits Specifications Adjustments and Functional Tests Cont Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Display Cont Vertical Size and align with tic marks none VERT SIZE L321 no Posi
132. ee ee touch Initialize in verification pop up menu eee touch Step 3 Trigger the oscilloscope as follows TRIGGER DUIO zug eod Se ae RAE ae ah RN A eoo hr he itn press Source in pop up menu 6 0 eee internal Clock L Step 4 On the Sampling Head press the Channel 1 select button F Step 5 On the oscilloscope press the AUTOSET button 4 43 Performance Tesis 4 44 Step 6 Check the rise time and peak to peak amplitude as follows MEASURE DURON uu each ace ach arae ER ER Hits Measurements in the major menu Peak Peak in the pop up menu Rise in the pop up menu Rise in the major menu Proximal in the pop up menu Adjust Proximal to 20 and Distal to 80 Check that Rise is lt 250 ps Check that peak to peak amplitude is between 225 mV and 275 mV 250 mV 10 Performance Verification 11801B Service Manual Adjustments This section contains procedures to check electrical specifications to exam ine measurement limits and to manually set all internal adjustments listed in Table 5 1 Use these procedures to return the oscilloscope to specified operation following repair or as part of a comprehensive performance verifi cation procedure to verify that the oscilloscope meets specifications To adjust the oscilloscope simply perform the procedures listed in this section The Specifications or Measurement Limits are g
133. en display and an ANSI compatibie terminal The terminal should inttially be set in its ANSI mode m K this keystroke toggles the screen output between the current screen display and a Tektronix 4x05 terminal 4105 4205 u L this keystroke toggles the screen output between the current screen display and a Tektronix 4x07 terminal 4107 4207 m H this keystroke produces a hardcopy of the current diagnostic menu as described earlier m OQ this keystroke disables enables the touch panel response to the user s touches It is equivalent to the TOUCH PANEL ON OFF button a Q this keystroke when used in interactive test menus stops and starts the display information in the keypad prompt area This keystroke is equivalent to the ACQUISITION RUN STOP button in those menus To gain access to the terminal mode diagnostics the instrument must be in the Extended Diagnostic mode To exit the terminal mode either recycle the power enter the Exit keystroke twice to begin normal operation or enter the appropriate L T or K keystroke to transfer the screen output back to the instrument display 6 86 Maintenance Diagnostic Troubleshooting System Mode GPIB The Self Test diagnostics and Extended Diagnostics are accessible using the amp RS 232 C two commands listed in Table 6 6 Table 6 6 System Mode Commands Header Argument Notes TEST Set only TEST XTND Set only T
134. en to I O address 8020 This causes the wait state diagnostics to connect the SRDY signal to the DIAGNSIG line on the Executive bus A timer on the A14 1 O board can then measure the length of the wait Memory Configuration Readback This circuitry allows the diagnostics to read the position of the memory configuration straps and the bank address lines One bit of the readback data byte also indicates if the battery is at 2 5 V an early warning of a low battery The EXP performs an I O read at address 80404 to read this information Battery Backup These batteries provide standby power to the nonvolatile RAM NVRAM during the powered off periods of the oscilloscope 11801B Service Manual 3 25 Block Diagram Descriptions A19 Strobe TDR The A19 Strobe TDR buffer board is comprised of the following three main Buffer Board one m Strobe sense select circuitry m Strobe deskew circuitry m TDR buffer and level shift circuitry See Figure 9 13 for a block diagram of this board Strobe Sense Select This circuit consists of five signal diodes these diodes are normally off The diodes carry the four sampling signals J1A J2A J3A J4A from the four sampling heads and the reference strobe signal When a particular diode is biased on it allows the selected strobe sense signal to continue out of jumper J32 Strobe Deskew This circuit corrects the time delay between the sampling strobe signals which may occur from the mism
135. ep 2 Remove the two Torx head screws on each black retaining brace located at the top of the Acquisition unit Step 3 Remove the A24 A27 Acquisition Analog boards the A25 A28 Acquisition MPU boards and the A19 Strobe TDR Buffer board Step 4 Remove the four screws holding the top of the front subpanei of the Acquisition unit Step 5 Remove the four screws on the goid colored locking bar lo cated on the top front of the Acquisition unit Step 6 Turn the Acquisition unit in the inverted position and repeat Steps 4 and 5 on the bottom of the Acquisition unit Oh DL LI Step 7 Remove the connectors from the A26 M F Acquisition Intercon nect board connector Note the position of the multi pin connector s index triangle to ensure that the connector can be correctly replaced L1 Step 8 Remove the Front Subpanel assembly with the A20 A23 Head Interconnect boards intact L Step 9 Remove the bottom Torx head screw from within the sampling head compartment that contains the head interconnect board you are removing Step 10 Turn the Front Subpanel assembly around so that the open compartments face away from you C Step 11 Remove the top nut that fastens the sampling head compart ment to the head interconnect board you are removing J1 2 3 4 Figure 6 24 Removing Replacing the A20 A23 Head interconnect Boards 11801B Service Manual 6 59 Corrective Maintenance Front View of Front Subpanel Asse
136. er Figure 9 16 A25 A28 Acquisition MPU Board Block Diagram 9 18 Diagrams 11801B Service Manual Block Diagrams This section contains the system block diagram interconnection diagram and the board level block diagrams Detailed discussion of these diagrams is located in the Theory of Operation section Biock Daigrams System Block Diagram GPIB RS 232 0 Printer Channel 1 Touch Channel 2 Acquisition Panel Buttons System KB 1 Executive VH Processor Status Channel 4 Channel 5 Channel6 amp Acquisition M System APRII 2 Management Channel 7 Unit Channel 8 Strobe Strobe amp Distribution TDR Drive Waveform Memory Trigger In Time Base Controller Figure 9 1 11801B System Functional Block Diagram Waveform Compressor and Display Control Diagrams Parts Ordering i Information 11801B Service Manual Replaceable Parts This section contains a list of the replaceable components for the 11801B As described below use this list to identify and order replacement parts Replacement parts are available from or through your local Tektronix Inc service 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 orde
137. er Port The Centronics style J111 printer port is controlled by a programmable peripheral interface IC This IC has all the contro lines necessary to connect to a microprocessor plus two genera purpose eight bit ports and the con trol signals to use them The A12 Rear Panel Assembly Data bus and Ad dress bus connect to the IC and have the same function as described for the GPIB and RS 232 C controllers The Printer Sel line is set low by the microprocessor when it is communicating with the interface The RD and WR lines allow the microprocessor to either read or write to the registers in the programmable peripheral interface IC This IC must be initialized by the microprocessor for Port A to be a strobed input port Port C provides the control signalis The A13 Mother board provides the interconnection for the mcteproceseer signals and the 5 V power among the following boards m A141 O board m A15 Memory Management Unit MMU board m A17 Executive Processor board u A18 Memory board 3 17 Block Diagram Descriptions A14 Input Output I O Board The A14 I O board contains the following circuits Data buffers Timer configuration circuitry m Real time clock w Serial data interface SDI u Temp tone readback buffer m Tone generator x GPIB control circuitry See Figure 9 9 for a block diagram of this board The A14 I O board is an interface between the Executive Processor EXP and devices on the A9 A10 and A11
138. erall result is that these connectors are installed and removed as a multi pin connector Pin 1 on mutti pin connectors is designated with a triangle or arrowhead A triangle dot or square printed on circuit boards denotes pin 1 When a connection is made to a circuit board the position or orientation of the 11801B Service Manual 6 75 Corrective Maintenance triangle on the multi pin holder is determined by the index triangle dot or square printed on the circuit board Most board mounted connectors have a square pad for pin 1 See Figure 6 32 NOTE Match the index triangle on the multi pin connectors with the corre sponding square pad on the circuit board Some multi pin connectors are keyed by a gap between the pin 1 and 3 positions 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 Align the plug in the multi pin holder with the gap between the circuit board pins The connector is then ready to be installed Many of the larger multi pin ribbon connectors have a red blue or other contrasting color line along one side of their attached wire cables This line indicates the location of pins 1 and 2 and aiso the location of the corre sponding triangle index mark on the connector some of the gray colored ribbon cables may have the number of their connectors stamped on them The ribbon connectors have the fo
139. ered by a single Tektronix part number as a single firmware kit Each IC cannot be ordered separately For the 11801B the firmware kit number is 020 1889 XX To remove and replace the firmware ICs in your oscilloscope follow these procedures WARNING Dangerous shock hazards may be exposed when the instrument covers are removed Before proceeding ensure that the oscillo scope PRINCIPAL POWER SWITCH is in the OFF position Then disconnect the instrument from the power source Disassembly should only be attempted by qualified service personnel To prevent static damage to the instrument observe all the special precautions mentioned under Static Sensitive Classification in this section 6 68 Maintenance Corrective Maintenance Firmware Upgrade Procedure To upgrade or replace your firmware ICs complete the following steps C Step 1 Prepare the instrument for the firmware upgrade procedure as follows m Setthe PRINCIPAL POWER SWITCH to OFF and remove the power cord m Place the instrument on its right side if not already in this position to provide access to the boards upgraded in the firmware upgrade procedure that follows Step 2 Access boards within the card cage as follows amp Ensure that the PRINCIPAL POWER SWITCH is set to OFF and the power cord is unplugged m Remove the instrument s top panel cover m Remove the two plastic board guides from the top of the card cage at the left rear of the i
140. error code 4yex for the Time Base processor or 6 80 Maintenance Self Test Extended Diagnostics 118018 Service Manual Diagnostic Troubleshooting 10 hex error code 2455 for the Acquisition processor from either internal test points or LEDs Refer to Tables 6 10 6 15 and 6 16 for more informa tion and examples of these hex error codes The Display kernel diagnostics display an error message on the screen giving the name of the test that failed For example the following message indicates that the DMA O test failed Dsy Kernel Failure DMA 0 if the error message does not appear on the screen the error index code can be obtained from the status LEDs and pins on the A15 Memory Man agement Unit board see Figure 6 34 Refer to the Power On Diagnostics procedure in the Performance Verification section for information about Selt Test Extended Diagnostics Extended Diagnostics Menu Structure The menu structure determines the format of the error index codes The Extended Diagnostics menus are a four level hierarchy with the Subsys that is the Subsystem menu at the highest level This four level Subsystem Block Area and Routine menu hierarchy generates the error index codes Each subsystem in the Subsystem menu can be selected and tested if there are functional processor s and communication paths Each subsystem is broken into a number of parts or circuit blocks in the Block menu for the selected subsystem In a sim
141. evices and generates status signals for the bus controller w the bus controller interprets the microprocessor s status signals and generates the necessary bus control signals for the Executive bus Address decoders address latches and data buffers are all support circuits for I O operations 3 22 Theory of Operation Biock Diagram Descriptions Numeric Coprocessor This coprocessor is a high speed floating point processor that executes instructions in parallel with the EXP The EXP programs and controis the numeric coprocessor as an l O device at addresses OF 8hex to OF Frey Bus Controller This circuit consists of a data buffer an address buffer and a control buffer that provide command and control signals from the microprocessor to the three Executive buses The Executive buses consist of the following The system data bus is a bidirectional bus It allows the microprocessor to fetch instructions from memory and also to write data to memory and read data from memory The memory that the microprocessor uses s lo cated on the A18 Memory board The system address bus carries the address of a device when the microprocessor is requesting access to that device Once the micropro cessor has access the addressed device can then respond to the microprocessor The system control bus carries control signals sent by the micropro cessor These control signals are sent to the devices that the micropro cessor addresses
142. f the diagnostics report an NVRAM battery failure then exit the diagnostics This will rewrite the confidence words into the NVRAM Turn the instrument off for at least one hour Then turn the instrument back on If the diagnostics still indicate an NVRAM battery failure then the battery should be tested 6 89 Diagnostic Troubleshooting Clearing NVRAM 6 90 Before a power up Self Test begins but just after the Executive processor has run its Kernel Diagnostics the front panel buttons are scanned by the Executive processor If the Executive processor senses that the WAVEFORM and TRIGGER buttons and only these two buttons are pressed i e closed during this time then the Executive processor resets its NVRAM to a default state the Teksecure Erase Memory function This essentially de stroys all stored settings stored traces and saved trace descriptions When this occurs the NVRAM is initialized by filling all but a few locations with a default value The following items are left intact after the NVRAM is reset Number of instrument power ons POWERON Instrument power on time UPTIME Mainframe serial number UID MAIN Maintenance Field Replaceable Unit FRU Guide 11801B Service Manual Diagnostic Troubleshooting This section correlates Kerne Diagnostic error index codes with the compo nents or boards suspected of causing each error The suspect FRU s for Self Test Extended Diagnostics error index codes
143. f 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 soldering or replacing components xvi Safety Safety Summary CRT Handling Use care when handling a CRT Breakage of the CRT causes a high velocity scattering of glass fragments implosion Protective clothing and safety glasses should be worn Avoid striking the CRT on any object which might cause it to crack or implode When storing a CRT place it in a protective carton or set it face down in a protected location on a smooth surface with a soft mat under the faceplate Use the Proper Fuse To avoid fire hazard use only a fuse which is identical in type voltage rating and current rating to the fuse specified in the Parts List section pamrah AAAA C 118018 Service Manual xvii Safety Summary xviii Safety Specifications This section provides specifications for testing and adjusting your 118018 oscilloscope Refer to the 77807B User Manual tor a general description of the characteristic environmental and user specifications of the oscillo scope Table 1 1 lists measurement and specification values Refer to the Performance Verification section for Performance test proc
144. ge from your body by wearing a wrist strap while handling these components Servicing static sensitive assemblies or components should be performed only at a static free work station by qualified service personnel We recommend using the static control mat refer to Table 4 2 for the part numbers of this test equipment Keep the work station surface free of anything that can generate or hold a static charge Keep the component leads shorted together whenever possible by storing them in conductive foam or rails Pick up components by the body never by the leads Do not slide the components over any surface Avoid handling components in areas that have a floor or work surface covering that can generate a static charge Corrective Maintenance Removing and Replacing FRUs Use Table 6 2 as a convenient reference for finding connector and screw locations when removing and replacing field replaceable units FRUs The first column in the table lists the FRU to be removed or replaced and the second column lists the figures that you shouid reference for the location of connector and screw locations discussed in the procedure to remove replace this FRU Table 6 2 FRU Removal Replacement Figure Cross Reference FRU to be Removed Figures to Heference During Removal Page Replaced Power Supply Module Figure 6 2 Removing the Power Supply Rear Plate Fan Housing and Rear Panel Connector Plate 000 6 16 Figure 6 3 A2A2 Co
145. h the instrument in the normal upright position for all steps Lifting the trim covers to remove them will break the trim covers There is a clip on the inside of the trim cover which slides over the end of the side frame section To remove the trim covers move each cover toward the end of the instrument where it is located The front cover moves forward and the rear cover moves back ward Moving the clip about 1 8 inch will release the cover Then the cover can be removed from the instrument C Step 1 Remove the bolt from the top of the chassis just behind the front casting a Step 2 Remove the trim covers from the right side as viewed from the front of the instrument C Step 3 Remove the two Torx head screws that hold the frame section and remove the frame section Step 4 Remove connectors J10 on the A26 M F Acquisition Intercon nect board and J34 on the A19 Strobe TDR Buffer board Note the position of the connector s index triangles to ensure that the multi pin connectors can be correctiy replaced C Step 5 Remove connectors J29A J30A J32 J33A and J33B on the A19 Strobe TDR Buffer board L Step 6 Grab between the two sampling head slots and gently pull out the Acquisition unit a few inches Step 7 Remove the gray ground wire from the rear of the Acquisition unit C Step 8 Remove the Acquisition unit To prevent damage to interconnecting wires be careful not to pinch any interconnecting wire
146. he following ICs U800 U900 U812 U910 U820 U920 U830 U930 In each case the last two digits of the part number on the replace ment IC should be the same as or higher than that on the removed IC Again ensure that pin 1 is oriented correctly w Heturn the A18 Memory board to its former location in the card cage 6 70 Maintenance Corrective Maintenance L Step 5 Upgrade the A5 Time Base Controller board firmware as follows Locate U300 U310 U400 and U410 on the A5 Time Base Controlier board see Figure 6 30 These components are found near the bottom front of the instrument with the instrument positioned on its right side Replace U300 U310 U400 and U410 on the A5 Time Base Control ier board The last two digit portion of the part number on the replacement IC should be the same as or higher than that on the removed IC Again ensure that pin 1 is oriented correctly Step 6 Upgrade the A25 A28 Acquisition MPU board firmware as follows m Remove the Acquisition unit from the instrument mg Remove the A25 A28 Acquisition MPU board from the Acquisition unit see Figure 6 1 for the exact location of these boards in the Acquisition unit m Locate U611 on the A25 A28 Acquisition MPU board see Fig ure 6 28 This board is located in the card cage m Replace U611 on the A25 A28 Acquisition MPU board The last two digit portion of the part number on the replacement IC should be the same as or higher tha
147. he visual aspects of the CRT display and you should only perform these adjustments when the CRT A7 CRT Socket board or A8 CRT Driver board com ponents are replaced These adjustments do not affect oscilloscope accuracy since all measurements are made on the acquired data not the displayed data Unless alignment or brightness difficulties are apparent proceed to the Real Time Clock procedure For all Examine steps in this procedure if the display parameter examined is within the stated limits then do not perform the Adjust step following that Examine step Instead proceed to the step following the Adjust step Measurement Limits The measurement limits are set on the CRT as follows 11801B Service Manual The display must be visible not cut off The red green and blue traces must not be separated Focus is adjusted for minimum line width Vertical size is adjusted to align the corners of the grid pattern with the tic marks on the edges of the front panel bezel Horizontal size is adjusted to align the corners of the grid pattern with the tic marks on the top and bottom edges of the front panel bezel and the horizontal linearity is adjusted for uniform grid box length Horizontal linearity is adjusted for optimum appearance using an inter nally generated grid pattern Red green and blue colors must have optimum white to gray scale linearity Red Display Green Disply and Blue Display in Extended Diagnostics must not
148. her type of cleaner consult your local Tektronix service center or representative Exterior Dust on the instrument can be removed with a soft cloth or small brush The brush is also useful for dislodging dirt on and around the front panel con trols Dirt which remains can be removed with a soft cloth dampened in a mild detergent and water solution Do not use abrasive cleaners CRT Faceplates are cleaned with a soft lint free cloth dampened with denatured alcohol Maintenance Visual Inspection Periodic Electrical Adjustment 118018 Service Manual Preventive Maintenance interior Cleaning should seidom be necessary To clean the interior blow off the dust with dry low velocity air approximately 5 Ib in2 Remove any dirt which remains with a soft brush or a cloth dampened with a mild detergent and water solution A cotton tipped applicator is useful for cleaning in narrow spaces or for cleaning more delicate circuit components After cleaning use a washcloth dampened with water to remove any residue Circuit boards and components must be dry before applying power to prevent damage from electrical arcing The high voltage circuits should receive special attention Exces sive dirt in these circuits may cause high voltage arcing and result in improper instrument operation The instrument should be inspected occasionally for defects such as broken connections improperly seated semiconductors damaged or improperly
149. ialize the mainframe as follows OPLET ONY o ow Co So gk WAR Sor oa nee ear eee Ad press Initialize in major menu 2 6 eee touch Initialize in verification pop up menu ss touch Step 3 Trigger the oscilloscope as follows TRIGGER DOLOR 2 oci Eod des Ea ve oce o RR det Cd press Source inmaiormenu uses re ERR ER rh en ieee touch internal Clock in pop up menu esses touch 11801B Service Manual 4 25 Performance Tests 4 26 7 Step 4 Identify the trace as follows POE Ira i Ot sce ELE BU eee le cise nae a uw touch identify Channel 2 20 0 0 ccc cece Ih touch Select Enter Desc llle ssh touch L Step 6 Set Averaging as follows Acquire Desc in major menu 00 00 0 0 eee touch Average N in pop up menu 0 00 0 cee eee touch Step 7 Select the Mean Measurement as follows MEASURE DURON cores Rex esa mir memrreImmN ma Dress Measurements in major menu 0 0 02 cee touch Mean in the Measurements pop up menu touch Compare amp References in major menu touch Save Current Meas Values as References POP UP MENU as bert tere eee E GOES UC ode coved touch Compare off to on in pop up menu ssssssssssss touch 7 Step 8 Setthe Voltage source to 8 mV Select Remove Clr Trace in major menu touch Select Clear Trace in pop up menu luueu esse touch
150. ice required If the original packaging is unfit for use or not available package the instru ment as follows L Step 1 Obtain a corrugated cardboard shipping carton with a 375 pound test strength and having inside dimensions at least six inches greater than the instrument dimensions This allows for cushioning C Step 2 Wrap the instrument with polyethylene sheeting or equivalent material to protect the finish C Step 3 Cushion the instrument on all sides by tightly packing dunnage or urethane foam between the carton and the instrument allowing three inches on each side C Step 4 Seal the carton with shipping tape or with an industrial stapler C Step 5 Mark the address of your local Tektronix service center and your return address on the carton in one or more prominent locations m AAAA a a I III a SSS rir IIH Edd Md 11801B Service Manuai 2 7 Operating Information Operating Information Theory of Operation The Tektronix 11801B is a high resolution digital sampling oscilloscope accommodating up to eight input channels through the dual channel sam pling heads With the SD 24 TDR Sampling Head eight channels of singile ended TDR or four channels of differential TDR are available as well Features include the following sweep rates ranging from 5 ms division to 1 ps div autoset to provide a suitably adjusted display for viewing and further manual adjustment windows for viewing expanded sections of a trac
151. ilar manner each block is broken into a num ber of circuit areas in the Area menu the third level The fourth and lowest menu level is the Houtine menu which contains the smallest test unit that can be selected and executed Extended Diagnostics Error Index Codes The error index codes for the Extended Diagnostics are five digit codes whose first character indicates the subsystem tested The last four digits are hexadecimal 45 numbers that indicate the Block Area Routine and specific failure mode For example E2321 is decoded as follows E Subsystem Executive 2 Block name Front Panel 3 Area name Soft Keys 2 Routine name Column Open 1 Failure Identity specific failure mode Table 6 5 lists the subsystem character for the Extended Diagnostic error index codes 6 81 Diagnostic Troubleshooting Table 6 5 Extended Diagnostics Error Index Code Descriptions Description Meaning E Executive D Display T Time Base m Mainframe Acquisitions a SM 11 multi channel unit A Acquisition b SM 11 multi channel unit B Acauisition C SM 11 multi channel unit C Acquisition d SM 11 multi channel unit D Acquisition Front panel controls are active during the Self Test diagnostics sequence and any disturbance may cause a test failure forcing the oscilloscope into the Extended Diagnostics mode Touch the E Exit label twice in succession to remove the Extended Diagnostics menu and resume normal ope
152. in pop up menu touch Block in imalor MONG ici xa CC pee Ee V ec CIE GR touch Input Output in pop up Menu 2 ee eee touch Area CO major menu Sess ced RR PERI ert eraan A EY Ede touch Real Time Clk in pop up menu sseeeeeess touch Routine in major menu 6 eee eee touch Calibrate in pop up menu 0 0 00 eee ee touch a LE i HH RLL al eT touch N Step 5 Examine that the frequency counter reads within the limits of 999 995 us and 1 000 005 us DO NOT attempt to optimize the Heal Time Clock setting if the period is within the stated limits Proceed to Step 7 7 Step 6 Adjust Real Time Clock C510 for 1 000 000 us 5 21 Adjustments C Step 7 Remove the frequency counter from the power module Step 8 Set the oscilloscope ON STANDBY switch to STANDBY G Step 9 Replace the circuit boards rearranged in Step 1 in their origi nal positions C510 Reai Time TP31 Ground Clock eter te Figure 5 6 A14 I O Board Test Point and Adjustment Locations 5 22 Adjustment Procedures Preventive Maintenance Regular maintenance can prevent instrument breakdown and may improve the reliability of the instrument The environment in which the instrument operates will determine the frequency of maintenance A convenient time for doing preventive maintenance is prior to performing an electrical adjust ment Removing the Cabinet Panels To prevent electric shock when
153. ing brace located at the top of the Acquisition unit to remove these braces Step 3 Remove connectors J1A J2A J3A J4A J1B J2B J3B J4B J1C J2C J3C JAC J29A J30A J32 J33A J33B and J34 from the A19 Strobe TDR Buffer board NOTE Record the positions of the connectors and the receptacles to ensure that the connectors can be correctly replaced L Step 4 Remove J10 from the A26 M F Acquisition Interconnect board C Step 5 Remove the two Torx head screws on the bottom of the A19 Strobe TDR Buffer board and gently pull out the board To replace the A19 Strobe TDR board perform the previous steps in reverse order 6 57 Corrective Maintenance J2A JIA J32 J4A J3A JIC J2C J3C J4C J33A 4338 J4B J3B J2B DURO PU J34 J1B ie BS pnm set tet terete ree eese soo Sf sns mssssomessssesosssosoososssmosossssegpeseegepespaetse quaMegeloeeNvssecee BollovetelilievieNtEeleBelseceelelscesmesemeessssoseseosesesecmseogegpeueoegesegeeocmogese pggl lBeee elee Beoeeeeceeeoeeeeo EN Torx Head Screws 2 J29A J30A Figure 6 23 Removing Replacing the A19 Strobe TDR Buffer Board 6 58 Maintenance Corrective Maintenance A20 A23 Head Interconnect Boards Removal and replacement steps are listed below See Figures 6 23 6 24 6 25 6 26 6 28 6 29 and 6 32 for connector and screw locations _ Step 1 Remove the Acquisition unit and place the Acquisition unit in the upright position St
154. ingle high low beep and illuminated menu button indicators for Executive kernel failures Self Test Diagnostics These begin by displaying Self Test in Progress when the Display micropro cessor has successfully communicated with the Executive microprocessor Pattern changes on the display and the flashing of the display indicate a test in progress The Self Test diagnostics are successfully completed when the oscilloscope returns to normal operation Any failures cause the oscilloscope to produce a double high low beep and then to display the Extended Diag nostics menu on the screen Faulty field replaceable units FRUs may then be identified by touching the Help label If any errors occur record the error codes for the failed circuit block s and then refer the oscilloscope to a qualified service person 11801B Service Manual 4 15 Performance Tests Front panel controls are active during the Self Test diagnostic sequence however any disturbance of these controls causes a test failure If such a failure occurs the oscilloscope automatically enters the Extended Diagnos tics mode and displays the Extended Diagnostics menu Touch the Exit label twice to remove this menu Note that if the diagnostics detect a fatal fault it may not be possible to exit the menu Power On Diagnostics Complete This state is signified when the oscilloscope returns to normal operation If the oscilloscope passes Power on diagnostics the front pa
155. installing the Power Supply module Maintenance Corrective Maintenance Fan Motor Removal See Figure 6 2 for connector and screw locations Replacement Remove and replace the fan motor as follows L Step 1 Using a pencil or tape mark the top of the fan motor housing for later use in determining the position of the motor Remove the four screws securing the housing to the rear of the instrument mainframe Hold the housing as you remove the last screws O Step 2 Separate the grill and the housing from the motor L Step 3 Remove the two wires at their motor connections Note that the red wire is and the brown wire ts C Step 4 Remove the fan motor NOTE Observe the position in which the motor was mounted to ensure that the motor is remounted in its original positioning or the fan wires may not reach To replace the fan motor perform the previous steps in the reverse order noting the following additional points while replacing the motor m use the mark from Step 1 to determine the original position of the motor tighten the screws securely remove the mark from the top of the housing check that no wires contact the fan blades To prevent damage to the fan connection be careful not to pinch the wires under the fan housing 11801B Service Manual 6 19 Corrective Maintenance Cathode Ray Tube WARNING CRT Removal Replacement The cathode ray tube CRT may retain a dangerous electrical 16 kV
156. int LOCaHOFS 12255 cr POCO on Ene o aD Ma CR RR s aces Sees 4 22 Figure 4 2 A5 Time Base Controller Board Test Point Locations 4 24 Figure 5 1 A18 Memory Board Test Point Locations 5 8 Figure 5 2 A2A2 Control Rectifier Board Test Point and Adiusiment EO6SODS 25 4 2 a i ox Rak Iii oa etd 5 10 Figure 5 3 A4 Regulator Board Test Point and Adjustment LODAIIOBS utt E d era edo o b Ra dole o Sept M aix 5 12 Figure 5 4 A8 CRT Driver Board Adjustment Locations 5 18 Figure 5 5 A7 CRT Socket Board Adjustment Locations 5 19 Figure 5 6 A14 VO Board Test Point and Adjustment Locations 5 22 Figure 6 1 Field Replaceable Units FRU Locator 6 14 Figure 6 2 Removing the Power Supply Module Fan Housing and Rear Panel Connector Plate 0 0 cc cece ene 6 16 Figure 6 3 A2A2 Contro Rectifier Board Connector Locations 6 17 Figure 6 4 Removing Replacing the CRT Cover 6 23 Figure 6 5 Removing Replacing the Cathode Ray Tube 6 24 Figure 6 6 Removing Replacing the CRT Torx Head Screws 6 25 Figure 6 7 Top View of the Card Cage ieeeeeeerrrerneenese 6 30 Figure 6 8 Removing Replacing the A1 M F Strobe Drive Board 6 31 Figure 6 9 Removing Replacing the A4 Regulator Board 6 33 Figure 6 10 Removing Replacing the A5 Time Base Controller EOS dosi south esa edu ua valla q na wi ardet de dad dcs Go scala dede 6 36 Figure 6 11
157. into the plastic guides at each end of the card cage Lower the board into position Ensure that connector P106 is seated onto the A13 Mother board connector Push down firmly on the A18 Memory board to seat this connector on the A13 Mother board A lithium battery BT130 is mounted on the A18 Memory board Be careful when placing the A18 Memory board on metal surfaces If some IC or battery leads are shorted the battery may discharge or overheat and vent You can use plastic standoffs to prevent short circuits This battery requires special handling for disposal Refer to the instructions on Lithium Battery Disposal and First Aid earlier in this section 11801B Service Manual 6 55 Corrective Maintenance eee bee om ae Bee tes ewes let Age on co as tesson pce cece ec ona suas tenes cage n Pa as setae e te ee ot eM Wu resp apiep ide Goes PrRenpsnb ra ER dd Pe E E ENTE ILU neglegi ies tana ea ta asta Front of Oscilloscope P P106 Lithium Battery To A13 Mother Board BT150 Connector Figure 6 22 Removing Replacing the A18 Memory Board 6 56 Maintenance 118018 Service Manual Corrective Maintenance A19 Strobe TDR Buf er Board Removal and replacement steps are listed below See Figures 6 23 6 26 and 6 32 for connector screw and index locations L Step 1 Remove the Acquisition unit and position the Acquisition unit in the upright position C Step 2 Remove the two Torx head screws on each black retain
158. iption Mfr Mir Part No Index Part No Effective Dscont Code No OPTION 10 7 1 614 0882 00 1 SUBPANEL ASSY 80009 614088200 EXCHANGE ITEM 2 211 0721 00 11 SCREW MACHINE 6 32 X 0 375 PNH STL OKBO1 ORDER BY DESC 3 103 0269 00 20 ADAPTER CONN SMA TO PELTOLA 24931 39JR198 1 A X 386 5472 00 1 PLATE CONN MTG ALUMINUM TK1943 ORDER BY DESC 5 386 5471 00 1 SUBPANEL REAR TKI916 ORDER BY DESC WIRE ASSEMBLIES SEE MAINT SECTION FOR CABLING DIAGRAM 174 0608 00 1 CABLE ASSYRF 50 OHM COAX 167 0L 9 2 TK2469 ORDER BY DESC 167 0 9 2 179 0L 9 3 179 0L 9 3 TO A19J23A J30A J33A J33B TO A5J29B J30B TO A1J33A J33B 174 0613 00 12 CABLE ASSY RF 50 OHM COAX 7 0 L 9 N TK2469 ORDER BY DESC FROM A1 1 2 4 3 4 4 TO REAR PNE MCU TDR DRIVE 1 2 3 4 FROM A1 1 2 3 4 TO REAR PNL MCU TDR DRIVE 1 2 3 4 FROM A1 1 2 3 4 TO REAR PANEL MCU STROBE SENSE 1 2 3 4 174 06318 00 8 CABLE ASSY RF 50 OHM COAX 15 0 L 9 N TK2469 ORDER BY DESC FROM A5 1 4 2 4 3 4 TO REAR PANEL MOU STROBE DRIVE 1 4 2 3 4 FROM AS 1 2 3 4 REAR PANEL MCU STROBE DRIVE 1 2 3 4 174 1093 00 1 CABLE ASSYRF 50 OHM COAX 30 0 L g 2 TK2469 ORDER BY DESC FROM A1J15 TO A5J15 10 24 Mechanical Parts List Replaceabie Parts Figure 10 7 Option 1M 11801B Service Manual i 10 25 F istine pais Fig amp Tektronix Serial No Qty 12345 Name amp Descri
159. iti Pin Connectors atid EO WEE oce etw IH ee beads 6 75 Checks After FRU Replacement seesees 6 77 Diagnostic Troubleshooting seeeeeneeeeee 6 79 Diagnostics Overview ccc cece eee e nnn nmn 6 79 Kernel Diagnostics c cc ccc cc cence ucceescncesacsaenes 6 80 Self Test Extended Diagnostics eens 6 81 Extended Diagnostics Menu Structure L 6 81 Extended Diagnostics Error Index Codes 6 81 Diagnostic Menus 0 00 cencncecrncsancusaunateeass 6 84 Diagnostic Menu Hardcopy ccc ce eee eee ee 6 85 Diagnostic Terminal Mode RS 232 C 6 86 System Mode GPIB amp RS 232 C elesee ee 6 87 cita ISSUING ieee ined eee even ie dee eee kata 6 89 Clearing NVRAM ccc cece cece ren ncanancneecceussuuens 6 90 Field Replaceable Unit FRU Guide 6 91 FRU Name Abbreviations ee ee ea eee eee 6 92 Component and Module Name Abbreviations 6 93 Executive Subsystem Error Index Codes 6 94 Display Subsystem Error Index Codes ss 6 98 Time Base Processor Error Index Codes 6 100 Acquisition Processor Error Index Codes ss 6 102 Other Troubleshooting lleeeeeeees een 6 103 Power Supply Module slseeeeee nnne 6 103 A4 Regulator Board iive cies skewed Gs ie
160. ition sys tem memory to the Waveform Memory through the waveform data direct memory access DMA 7 The EXP processes information from the human interfaces that is the menus icons buttons and knobs that you interact with to contro the oscilloscope 8 The EXP sends commands to the display system so that the function that the user selected is displayed 9 When instructed by the EXP the display system receives the waveform data from waveform memory and converts it to a unique vertical raster scan format for a display based on the user s settings Theory of Operation A1 M F Strobe Drive Board 11801B Service Manual Block Diagram Descriptions This section describes the 11801B detailed block diagram see Figure 9 2 and the board level block diagrams see the Diagrams section The A1 M F Strobe Drive board consists of the following circuits a Data buffers circuitry m Address latch circuitry mw Function decoder circuitry m Internal clock rate generator circuitry m Control buffers circuitry See Figure 9 3 for a block diagram of this board Data Buffers This circuit buffers the A5 Time Base Controller board s address and data buses with bidirectional buffers and the A5 Time Base Controller board s control lines with octal buffers Address Latch This circuitry buffers and latches the address for the A5 Time Base Control ler board to use Function Decoder This circuit partially decodes this latched ad
161. iven at the beginning of each procedure Functional tests are included in the Performance Verification section Refer to the 778078 Digital Sampling Oscilloscope User Manual for more information about specifications and oscilloscope operation The Setup in each procedure provides information concerning test equipment setup or interconnection Refer to Table 5 2 for more information concerning test equipment used in the setups Most Adiustment and Performance Verification procedures can be run in any order However the Sampling Head Calibration must always precede other procedures which use an operational sampling head Also if a different sampling head is used then sampling head calibration is required for each additional sampling head Adjustments Table 5 1 Measurement Limits and Adjustments Procedure Description Measurement Adjustments Limits Examine Adjust Power Supply Voltage Supply 4 85 V to 5 25 V none Voltage Reference T5 15V10 T5225 V R800 5 2 V Ref for 5 20 V Regulator Reference 9 95 V to 10 05 V R730 10 V Ref for 10 00 V Display Cutoff visible SCHEEN on transformer on A8 CRT Driver board until display appears Convergence primary colors are not CONVERGENCE R210 for separated in the white grid optimum convergence of red green and blue Focus focused grid pattern FOCUS on transformer on A8 CRT Driver board for optimum focus on white grid pattern Vertical Size and
162. ix part number Corrective Maintenance Static Sensitive Device Classification Static discharge can damage any semiconductor component in this instrument Follow the precautions in this section to prevent damage This instrument contains electrical componenis that are susceptible to damage from static discharge See Table 6 1 for the relative susceptibility of various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments Table 6 1 Relative Susceptibility to Damage from Static Discharge Semiconductor Classes Relative Susceptibility Levels MOS or CMOS microcircuits and discrete or linear 100 V to 500 V microcircuits with MOS inputs most sensitive ECL 200 V to 500 V Schottky signal diodes 250 V Schottky TTL 500 V High frequency bipolar transistors 400 V to 600 V JFETs 600 V to 800 V Linear microcircuits 400 V to 1000 V est Low power Schottky TTL 900 V TTL least sensitive 1200 V Voltage discharged from a 100 pF capacitor through a resistance of 100 Q 6 6 Maintenance 118018 Service Manual Corrective Maintenance Observe the following precautions to avoid damage Minimize handling of static sensitive components Transport and store static sensitive components or assemblies in their original containers anti static tube rail or conductive foam Label any package that contains static sensitive assemblies or components Discharge the static volta
163. k on the A14 I O board If the clock begins to lose time rapidly when the instrument is turned off or the diagnostics report that the Real Time CIk E42XX has failed the battery should be tested If the battery voltage measures less than 2 7 V then the most likely source of the problem is the battery and you should follow the instructions for battery replacement and disposal earlier in this section Battery BT150 provides power for the nonvolatile RAM NVRAM on the A18 Memory board If the diagnostics consistently report an NVRAM Battery E141X failure over multiple power ons then the battery should be tested If the battery voltage measures less than 2 7 V then the most likely source of the problem is the battery and you should follow the instructions for battery replacement and disposai earlier in this section Sockets for devices U500 and U511 provide power for the NVRAM on the A5 Time Base Controller board If the diagnostics consistently report a Static RAM Battery T1331 failure over multiple power ons then the batteries should be tested If either one of the battery voltages measures less than 2 1 V as measured on pin 28 Vco follow the instructions for battery re placement and disposal earlier in this section It is recommended that both batteries be replaced at the same time NOTE Turning the instrument off while Extended Diagnostics is executing one of the NVRAM memory tests may cause failure of the NVRAM battery test I
164. l sampling Head compartments Setup to Check Offset Accuracy Calibration Head DIRECT input jn ri i Prec Voltage Source L 1 B d L 00999909 9l 4 1180158 S 50 Q Coaxial Cable Procedure to Check Offset Accuracy Step 1 This second vertical accuracy test uses the same setup prelimi naries as the previous test The Calibration Head Time Base error will only reappear if you have activated power up diagnostics If so exit diagnostics and in either case continue from here Step 2 Initialize the mainframe as follows RET YOUN rp press Initialize in major menu 0 eee eee eee touch Initialize in verification pop up menu touch 4 28 Performance Verification 11801B Service Manual Performance Tests _ Step 3 Trigger the oscilloscope as follows TRIGGER DIOM tac ch ct Eo EL de b e tees vhs ES As press Source n major MENU e eiiie ED UeP pau E Race touch Internal Clock in pop up menu lslssees touch Step 4 Define the trace as follows Der TA CON veda rra dee t NER EORR A o e toe Sew Sdn touch Ideni Channel 2 a suia io ere p Ed ED EIE touch Select Enter Desc een RR RR I touch C Step 5 Set Averaging as follows Acquire Desc in major menu 0 ce enn touch Average N in pop up menu ssesesees eee nes touch Seel E reoot cout un RENI haan ace Saige des touch Step 6 Select the Mean Measu
165. led corner aligns with a spring small metal tab at one corner of the socket An example of the IC is shown in Figure 6 32 To remove the Serial Data Interface IC proceed as follows Step 1 Remove the A14 I O board C Step 2 Hold the heat sink cover in place and unfasten the retaining clip by moving the retaining clip across the tabs while pushing down slightly on the cover To prevent static damage to the instrument or components observe all the special precautions mentioned under Static Sensitive Classi fication in this section 7 Step 3 Remove the cover slowly to prevent the IC from falling out Note the position of the index of the IC for later use before removing the IC Step 4 Remove the IC with tweezers Finger oils can degrade reliability of components Avoid touching the IC or its socket contacts with your fingers 11801B Service Manual 6 65 Corrective Maintenance 6 66 Replace the Serial Data Interface IC as follows Step 1 Using tweezers place the beveled corner of the replacement IC against the index spring the original positioning of this index was noted earlier CAUTION Do not damage the spring by improperly seating the beveled corner because shorting of the two corner contacts could result C Step 2 Arrange the other corners with the tweezers to fit evenly at the edges of the socket C Step 3 Set the cover flat on the IC with the cover s end tabs properly aligned with but
166. lems are present they appear when the ON STANDBY switch is set to ON If the green indicator beside the ON label fails to light then check for the following conditions m The PRINCIPAL POWER SWITCH located on the back panel is in the ON position m The line cord is connected to a functional power source with the same output voltage as set at the LINE VOLTAGE SELECTOR on the back panel m The fuse is good If the fuse is blown then replace the fuse m The fan is exhausting air from the instrument when the ON STANDBY switch is ON A defective fan causes an over temperature shutdown in the power supply If these checks fail to correct the problem connect the Extended Diagnos tics 11000 Series Power Supplies Test Fixture to the Power Supply module refer to the documentation accompanying the test fixture for troubleshoot ing techniques The test fixture indicates which power supply voltage source is at fault To help isolate the source of the problem set the instru ment s ON STANDBY switch to STANDBY and disconnect the suspected faulty power supply voltage source from the Power Supply module Set the ON STANDBY switch to ON If the test fixture does not record a fauit then you have verified the suspected fauity power source This procedure is only effective for externally shorted power supplies Once again refer to the documentation accompanying the test fixture for more troubleshooting information This board is implicitly verified
167. llowing two functions e to provide a strain relief for the wire connections The wire ribbon is wrapped around a bar between the wire connections and the top of the connector Strain is then felt between the wires and the top of the con nector This relieves most of the strain which would otherwise be felt on the wire connections amp to provide a puli tab to ease disconnection The pull tab is attached inside the connector When the tab is pulled even pressure is applied across the connector The connector then separates easily from its holder NOTE To remove these ribbon connectors grasp the pull tab fastened into the connector if there and pull it loose from the holder If there isn t a pull tab present in the connector grasp the ends of the connector instead Pull it straight out from the connector socket 6 76 Maintenance Checks After FRU Replacement 11801B Service Manual Corrective Maintenance After any FRU has been replaced that particular unit should be checked Table 6 4 lists the required checks and the respective procedure name to perform Table 6 4 Checks Hequired After FRU Replacement FRU Replacement A1 Strobe Drive Board A3 M F Power Connect Board A4 Regulator Board A5 Time Base Controller Board A8 CRT Driver Board A9 Touch Panel Assembly A10 Front Panel Control Board A11 Front Panel Button Board A12 Rear Panel Board A13 Mother Board A14 Input Output Board
168. llows you to interactively touch any of the soft keys and verify their operation This test verifies the oper ation of a key with both visual and audio feedback This test requires operator interaction and can be ex ecuted oniy in the Routine pop up menu with the All and Loop modes set to Off Once this test is invoked you can touch any of the soft keys in the instrument and verify that a touch box is drawn around the soft key on the screen and that an audio click is generated This test allows you to turn either of the knobs and verify their operation This test verifies knob movement with visual feedback This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the All and Loop modes set to Off Once this test is invoked you can turn either of the knobs on the instrument and verify that the corresponding knob pointer on the screen ro tates and that the associated counter value changes These tests allow you to examine and adiust the CRT adjustments pertaining to color These tests require operator interaction and are only ex ecutable in the Routine pop up menu with the All and Loop modes set to Off Once one of the tests is invoked the operator can examine adjust the CRT by following the procedure outlined in the Adjustments section Maintenance Diagnostic Troubleshooting Table 6 12 Executive Processor Manual Tests Cont Test Verification Procedure Internal I O Tone Gen
169. lly enters Extended Diagnostics at the end of the Self Test diagnostics If the Display processor is at fault then the Extended Diagnostic menu will not appear on the screen The Kerne diagnostic tests execute concurrently in all three subsystem processor circuits at power on Hardware critical to diagnostic operation is verified such as ROM RAM DMAs timers and interrupt control circuitry For the Executive Processor this requires checking basic operation for most boards in the card cage that is those boards plugged in to the A13 Mother board The last step of Kernel diagnostics for the Display Time Base and Acquisition processors is to verify communication Within each processor all Kernel diagnostics must execute without failures before the Self Test diag nostics can execute However the Executive processor continues with its Self Test diagnostics despite a communication failure encountered with the Display and or Time Base processors and the Time Base processor does not halt when it has a communication failure with the Acquisition processor Since the condition of the instrument is unknown at power on when a kernel failure occurs Kernel diagnostics in the Executive Time Base and Acquisi tion processors do not attempt to display error index codes Instead these processors generate hexidecimai hex numbers that are read as a series of binary bits such as XXX1 0101 hex error code 15pex for the Executive processor 0100 hex
170. lue White Grounded Earth Green Yellow Green Standard Option A1 Opt on A2 Option A3 North American Universal Euro UK Australian 115V 230V 230V 230V Option A4 Option A5 Option 1A Option 18 North American Switzerland North American North American 230V 230V 115V High Power 3 Phase Canadian Standards Association certification includes these power plugs for use in the North American power network Figure 7 1 Power Cord Plug Identification 7 2 Options Electrical Parts The modules that make up this instrument are often a combination of me chanical and electrical subparts Therefore all replaceable modules are listed in the Parts List section Refer to that section for part numbers when using this manual 11801B Service Manual Electrical Parts Electrical Parts List sueibeig yoolg amp 6 lt D ureibejq BuligeO x2olg pelled GLOSLL 2 6 einBid OOD aa i531 BV gor aen e LOBNNOD HZMOd i W EY s er oi 7r OT JOSNNOD H3MOd 4 W EY er OL OT ver amp ZAXHO BS8OHIS TV or Oi Saran oS or CIT Set l 95 fa A p a2 LSA oor BES NOTLISINGSV BAIXO 3SHOHIS TV 8 Zd rer oL St SAITO BA0NLS FY seer WONJ SAlNU Agis TY VEEP WOM MULT AT GNASSY AV330 a Oi Na3SuUu L YA TIONINGI BSVYSANIL SV YSEer mWONZ YS TIOVINOI ASYEANTi SY Y6er WOud tyr COL ab I Lev sm G em NOTLISINOSY Per C Cd fel ag ap en e gay OBvYDS LOJ33NNOOHAZLNI NOTLISTAG
171. m 5V wm 15V wm 50V See Figure 9 4 for a block diagram of this board The operational amplifiers used for the 50 V 15 V 5 V 50 V 15 V and 5 V regulators require that the following special voltages be generated for their operation m semi reguiated 54 V supply generates the 20 V supply mw semi regulated 54 V supply generates the 20 V supply m semi reguiated 54 V supply generates the 10 V supply m semi reguiated 54 V supply generates the 10 V supply u 10 0 REF is used as a reference voltage Voltage Fault Detect This circuit consists of two window comparators and associated resistors This circuitry detects if any regulated supply is over voltage or under voltage The associated resistors set a hysteresis window that is 596 of the regulator sense line voltages Theory of Operation A5 Time Base Controller Board Block Diagram Descriptions The A5 Time Base Controller board consists of the following circuitry Microprocessor MPU m RAM ROM mw Trigger circuitry Time Base circuitry amp Acquisition system interface m Memory management unit MMU interface See Figure 9 5 for the block diagram of this board Microprocessor The microprocessor controls the time base and trigger circuitry in response to commands from the Executive Processor performs local on line calibra tion of the time base schedules waveform acquisitions and manages the Acquisition system and waveform data
172. mV div 2 V 1 998 V 2 002 V 10 mV div 400 mV 402 mV 398 mV 10 mV div ev 1 002 V 0 998 V 10 mV div 2V 2 002 V 1 998 V 4 30 Performance Verification Performance Tests System Vertical This procedure uses the RMS measurement function to measure the noise RMS Noise on the trace from a sampling head compartment Setup to Examine Vertical RMS Noise Calibration Head 11801B a LLLLLL Procedure to Examine Vertical RMS Noise Step 1 Install the Calibration Head 067 1413 00 into the position shown in the setup diagram If the unit was in standby mode set the ON STANDBY switch to ON NOTE If powering up from a cold start The diagnostics will report an error using the Calibration Head The report will indicate a Time Base error To clear this exit the diagnostics Then ignore the subse quent time base calibration failure notice and continue with the following steps LL Step 2 Initialize the mainframe as follows UTEN dolio Cr press Initialize in major menu 0 0 cece eee ee ee ee touch initialize in verification pop up menu 065 touch a Step 3 Trigger the oscilloscope as follows TRIGGER DUNO so ue fine rue ais Le ere reatus eot Dress Source in major Menu 13 dc aor aC o e eee e es touch internal Clock in pop up menu sesessess touch Step 4 Identify the trace as follows Der TFA ICON oreren toad Ra UU a dee Gund bee ee eeu teat bs to
173. mally listed as the most to least probable cause for errors in the routine In some cases the FRUS are listed ac cording to their ease of replaceability in order to minimize the time required to identify the faulty FRU 6 82 Maintenance Diagnostic Troubleshooting Within this menu you can scan forward to the next routine or the next failure by touching the appropriate selectors in the lower portion of the screen which functions like a simple keypad Scanning continues in a circular fashion through all available subsystems Upon exiting this menu the instrument returns to the same menu level that is Subsystem Block Area and Houtine that it was at before the help function was invoked However the displayed menu may be differ ent if any scanning was performed Delete places an execution mark on the currently selected menu name in the upper menu area and all items beneath it down to the Routine level This inhibits the actual execution of these routines when r Run is invoked Visually execution marks are displayed on the screen as an asterisk immediately to the left of the menu name in the upper menu area If one but not all menu names in a menu are marked with an asterisk then the name of the menu at the next highest level that is from Area to Block is preceded by an execution mark of a minus a Add removes the execution mark if present on the currently selected menu name and all ex
174. mbly Es e Sampling Head Compartments SERRA Tp NC dete NND LOADS ESSA Sig BERS NN SA fcc DURS CLG MILI PON za Cal a ILULA gt gt LP f PITAL ET I LA a arb daa d SN N aa AN SN a ANN N Torx Head Screws Torx Head Screws Rear View of Front Subpanel Assembly A20 A23 Head interconnect A20 A23 Head interconnect Board Retaining Nuts Board Retaining Nuts Power Only A20 A23 Head Interconnect Boards Retaining Tabs Retaining Tabs 4 per Board 4 per Board Figure 6 25 Removing Replacing the Front Subpanel Assembly LU Step 12 Remove the head interconnect board by slightly prying up on the tabs that are keeping it in place and slowly remove the board s from the J1 2 3 4 connector To replace the A20 A23 Head Interconnect boards perform the previous steps in reverse order i 6 60 Maintenance Corrective Maintenance A26 M F Acquisition Interconnect Board Removal and replacement steps are listed below See Figures 6 23 6 25 6 26 6 27 6 28 6 29 and 6 32 for connector screw and index locations Step 1 Remove the Acquisition unit as and place the Acquisition unit in the upright position Step 2 Remove the A24 A27 Acquisition Analog board the A25 A28 Acquisition MPU board and the A19 Strobe TDR Buffer board a Step 3 Remove the four screws on the gold colored retaining brace holding the top of the Front Subpanel assembly of the Ac
175. mory data buffers Wait state generator m Wait state diagnostics m Memory configuration readback Nonvolatile RAM and battery backup See Figure 9 12 for a block diagram of this board Address Latches This circuitry buffers and holds the address lines for the EPROMs SRAMs NVRAMs and other on board devices until the end of the bus cycle Address Decode and Memory Select This circuitry consists of a programmable array logic PAL device that decodes the address lines to produce five RAM select signals DCS4 8 and four EPROM select signals DCS0 3 DCS8 enables the SRAM while DCS4 7 enable the NVRAM All EPROM and RAM select lines are latched and the latch outputs are normally enabled While the latch enable signal is high the latch outputs are responsive to changes on the inputs while the latch enable signal is low the select lines are latched The EXP on the A17 Executive Processor board generates the address line inputs A14 A19 Depending upon the position of a jumper on the A17 Executive Processor board address lines A20 A23 can be memory bank se lect lines or microprocessor address lines The memory select circuitry provides latched memory select lines and an enable signal for the memory data buffers 3 24 Theory of Operation Biock Diagram Descriptions EPROMs SRAM and NVRAM The memory includes EPROMs System RAM SRAM and Nonvolatile RAM NVRAM The EPROMs contain all of the operating system code and diag
176. mpling head Table 4 1 Measurement Limits Specifications and Functional Tests Part and Description Measurement Specifications Functional Limits Examine Check Test Power On Diagnostics none none yes Sampling Head none none yes Extended Diagnostics none none yes Vertical Reference Voltage none 5 V 200 uV and no 5 V 200 uV Horizontal Reference Clock none 200 000 kHz x5 kHz no Vertical Accuracy Vertical Gain none 1 0 fuil scale yes Offset Accuracy none 2 mV yes Vertical Linearity none 1 no System Vertical RMS Noise 200 uV at 2 mV div none yes 500 uV at 5 mV div 1 mV at 10 mV div 632 uV at 20 mV div 1 58 mV at 500 mV div 3 16 mV at 100 mV div 6 32 mV at 200 mV div m ISHPHH OPOR IER EE EL ELM MM Aaaa 11801B Service Manual 4 1 Performance Verification Table 4 1 Measurement Limits Specifications and Functional Tests Cont Part and Description Measurement Specifications Functional Limits Examine Check Test 0 05 at 2 ns div none yes 0 08 at 1 ns div 0 8 at 100 ps div 2 5 at 10 ps div 1096 at 1 ps div UNTEN Wie mer sU AINE Emma a a RR RR Sweep Rate Accuracy Triggering yes 300 MHz Sensitivity 100 mV at 300 MHz 100 mV stable display 1000 MHz Sensitivity 100 mV at 1000 MHz 100 mV stable display 3 0 GHz Sensitivity 100 MVp 5 at 3 0 GHz 100 mV stable display Internal Clock yes Ri
177. multiplexer although these signals are used only for self tests and diagnostics Strobe Distribution The Strobe Distribution block acts as an interface between the Time Base Block Controller and the Acquisition systems The Time Base Controller generates a strobe pulse that is regenerated by the Strobe Distribution block to drive all of the sampling heads in parallel Time Base Controller The Time Base Controller block is comprised of Block um amicroprocessor with local RAM and ROM m the time base and trigger circuits w interfaces to the memory management unit MMU and Acquisition systems Trigger Select Block The Trigger Select block selects the desired trigger signal to be sent to the Time Base Controlier block 11801B Service Manual 3 3 System Functional Overview Executive Processor Block Memory Management Unit Block After the user reguests an operation with a front panel control for instance the Executive Processor EXP directs the oscilloscope to perform this operation Another primary function of the EXP is to execute diagnostic Self Tests on the instrument when powering on or at the user s request To control operations the EXP controls and monitors the other circuit boards sharing the executive system bus Through the executive bus boards the EXP also indirectly controls all other instrument boards The EXP generates commands and status signals to control on board devices and O devices such as GP
178. n that on the removed IC Ensure that pin 1 is oriented correctly 11801B Service Manual 6 71 Corrective Maintenance C Step 7 Verify the instrument serial number as follows Fa a Locate the manufacturing jumper J860 on the A5 Time Base Con troller board see Figure 6 10 and install the terminal connector link w Connect a power cord to the instrument m Connect a terminal or controller to the oscilloscope Refer to the 1180188 User Manual for more information on this connection Set the PRINCIPAL POWER SWITCH and ON STANDBY switch to ON m Set necessary communication parameters for example baud rate w After the instrument is powered on to establish communication from the terminal or controller enter the following commands CR is the return key e lt CR gt v lt CR gt gu Verify that the serial number on the instrument s front panel matches the mainframe ID number in the Identify pop up menu in the UTILITY major menu m Ifthe numbers do not match then enter the command uid main BOOO00C CR where XXXX corresponds to the serial number digits found on the front panel serial number marker m Verify that the proper ID is now displayed in the Identify pop up menu in the Utility major menu Step 8 Remove the procedure setup as follows amp Set the PRINCIPAL POWER SWITCH to OFF Remove the J860 manufacturing jumper from the A5 Time Base Controller board m Replace the bottom in
179. nation 50 O Impedance 50 Q Tektronix Part 015 1022 00 accuracy within 2 SMA connectors Attenuator 10X 20 dB attenuation Tektronix Part 011 0059 02 50 one male and one female Attenuator 2X 50 Q SMA one Tektronix Part 015 1001 00 male and one female Power Supplies Tektronix Part 067 1264 00 Troubleshooting Extended Diagnostics Fixture 11000 Series Power Supplies troubleshooting fixture Probe 10X Attenuation 10X Tektronix P6106A Alignment Tool Plastic hex Tektronix Part 003 0301 00 Insulated siot Tektronix Part 003 0675 01 Square Tip Tektronix Part 003 1400 00 ceramic Magnetic Screw Holder for Torx Tektronix Part 003 0293 00 driver head tips Torx Head Screw 10 tip Tektronix Part 003 0814 00 driver 15 tip Tektronix Part 003 0966 00 20 tip Tektronix Part 003 0866 00 5 4 Adjustment Procedures Adjustments Table 5 2 Test Equipment Cont a 984 Description Minimum Examples of Applicable Specification Test Equipment ETE SRS ERE External Loopback RS 232 C Tektronix Part 013 0198 00 Connector connector Shorting Strap two alligaior clips on a short pigtail conductor Integrated Circuit IC Insertion General Tool P N U505BG or Extracting Tool Extraction Pliers equivalent 28 pin type Board Removal Straight slot screw Tools driver large Torx drive screw driver T 7 I 8 1 10 1 1
180. nd A18 Memory boards Note the position of the multi pin connector s index triangles to ensure that the connectors can be correctly replaced NOTE Tag the interconnecting plugs and mark the board locations to ensure that the plugs can be correctly replaced as well C Step 3 Remove connector J63A from the A13 Mother board 7 Step 4 Remove the six Torx head screws Step 5 Remove the A13 Mother board To replace the A13 Mother board perform perform the previous steps in reverse order To prevent damage to the interconnecting wires be careful not to pinch the wires along the inside edge while replacing this board 11801B Service Manual 6 47 Corrective Maintenance J63A P Torx Head Screws 6 Figure 6 18 Removing Replacing the A13 Mother Board 6 48 Maintenance Corrective Maintenance A14 Input Output I O Board See Figures 6 4 6 7 6 19 and 6 32 for board connector screw and index locations Remove and replace the A14 I O board as follows C Step 1 Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover Step 2 Remove both of the plastic board guides from the top of the card cage These guides are retained by two small catches located in two holes in the left bracket of the card cage The other ends of the guides contain slots which attach to the edge of a metal bracket Both ends of the guides can be pried loose _ Step 3 Remove connector
181. nd foreign patents issued and pending The following are registered trademarks TEKTRONIX TEK TEKPROBE and SGOPE MOBILE EIDEM WARRANTY inanan Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one T1 y t fortes date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repairthie defective product without charge for parts and labor or will provide a replacement in exchange for the defective produ atisoz In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the wartdfily period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shail pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix s Sivice center is located Customer shall be responsible for paying al shipping charges duties taxes and any other arges Er products returned to any other locations This warranty shall not apply to any defect failure or damage caused by impropeti se or improper or inadequate maintefjarice and care Tektronix shall not be obligated to furnish service under this warranty apto repair damage resulting from attempts by personnel
182. nd menu fields Menu items are rows of items that can be selected while menu fields are columns of status infor mation There are four tiers of menus which may appear in the menu area only one is present at any given time the Subsystem Block Area and Routine menus Upon entry into any menu there is always one menu item which is selected Additionally only one menu item can be selected at any given time The following field descriptions apply for Subsystem Block Area and Rou tine menus subsystem Block and Area menus are divided into the following four fields Execution Mark Title Error Index Code and Failure Count The Routine menu has these and three additionai test result fields m Execution Mark is a one character field preceding the Title field and succeeding the keystroke selector identification The three values of this field and their meanings are as follows All routines in this Subsystem Block or Area are available for execution UNS No routines in the Subsystem Block or Area are available for execution One or more routines in the Subsystem Block or Area are available for execution Refer to the Delete and Add descriptions for further information u Title field contains the name of individual hardware Subsystems Biocks Areas or Routines Error Index Code field contains an index code The index field may contain one of five types of status indicating one of four types of tests pro
183. nel settings that were in effect at the last power off are restored 4 16 Performance Verification Performance fests Sampling Heads This procedure shows the setup and lists the steps for calibrating Loop Gain and Offset Null Note that this is an optional enhanced accuracy procedure that fine tunes internal channel processing circuitry in conjunction with any operational sampling head type being used the 067 1413 00 calibration head is a service device and does not require system calibration This procedure also initiates a built in 11801B program which causes the main frame to remember which sampling head type was used in the calibration In this way pre calibrated heads can be interchanged without requiring recalibration Setup to Calibrate a Sampling Head Sampling Head except SD 14 11801B L LLLLLL not connected yet u w 12 RF Cable nt 50 Q Termination not connected yet Procedure to Calibrate a Sampling Head Step 1 Power up and Initialize as follows Set the ON STANDBY switch to ON 0 2 0 ee eee rocker press UTE DORON aue duce rode Eden wt d ae Deo cte at ca press initialize in major Menu os suo es X E Ga touch Initialize Verify lt lt a io tiw brin EROR E Rea ege en touch Step 2 Set up first Automatic Calibration as follows Press the UE VY DURON 4 Sede hers parents press Page to Enhanced Accuracy 505 eee press Gain an major Menu iii neces tas P RANGA
184. ng a voltage outside the range printed on the sampling head can result in damage Static electricity is also a hazard The input diodes used in the sampling heads are very susceptible to dam age from overdrive signal or DC voltages and from electrostatic discharge Never apply a voltage outside the range printed on the front of the sampling head Operate the 11801B only in a static controlled environment Connect the wrist strap provided with the 11801B to the ANTISTATIC CON NECTION as shown in Figure 2 1 Refer to the 178018 Digital Sampling Oscilloscope User Manual tor more information Step 1 Check that the sampling head is not yet installed and that the ON STANDBY switch is in the STANDBY position Step 2 Remove the top and bottom covers from the oscilloscope unless you are only performing a functional test C Step 3 Install an SD Series sampling head in the ieft sampling head compartment marked CH 1 CH 2 C Step 4 With the oscilloscope s rear pane PRINCIPAL POWER SWITCH set to OFF connect the oscilloscope to a suitable power source Performance Verification Performance Tests C Step 5 Set the rear panel PRINCIPAL POWER SWITCH to ON and then set the oscilloscope s front panel ON STANDBY switch to ON When the oscilloscope is first installed the rear panei PRINCIPAL POWER SWITCH should be set to and left in the ON position From then on use the front panel ON STANDBY switch to perform ali subsequent power
185. ns 1186016 Service Manual Table 6 12 lists the Executive processor manual tests and verification proce dures If the conditions specified in the verification procedure listed are not met then the suspect FRUs can be found by using the Help function These tests are performed manuaily and produce no error index code displays They are included to help you locate faulty boards that the Kernel or Self Test diagnostics possibly did not locate Interconnections such as the A13 Mother board cables and the power supply boards are not listed how ever these interconnections are considered as possibie problem sources 6 95 Diagnostic Troubleshooting Table 6 12 Executive Processor Manual Tests Test Front Panel Verify Hard Keys Soft Keys Knobs Test Pattern Gray Scale Green Grid White Grid Red Display Green Display Blue Display HV Reg Dspiy 6 96 Verification Procedure This test allows you to interactively press the hard keys to verify their operation This test verifies the operation of a key with both visual and audio feedback This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the All and Loop modes set to Off Once this test is invoked you can press any of the hard keys on the instrument and verify that the corresponding image of the key on the screen is highlighted that the associated LED is turned on and that an audio click is generated This test a
186. nstrument amp Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover see Figure 6 4 Figure 6 31 IC insertion Extraction Tool 11801B Service Manual 6 69 Corrective Maintenance C Step 3 Upgrade the A15 MMU board firmware as follows m Remove the A15 MMU board from the card cage The A15 MMU board is typically located farthest from the outside left side of the instrument R Locate the two firmware ICs U140 and U150 CAUTION To prevent damage to the firmware ICs or the board ensure pin 1 is positioned correctly when replacing components NOTE Use the IC insertion Extraction Pliers shown in Figure 6 31 for removing and replacing the ICs Refer to Table 4 2 Test Equip ment for the part number of these pliers Do not use the label on the IC for an index because it may be applied incorrectly See Figure 6 32 for the correct location of the index on the IC m Remove U140 and replace it with the upgraded IC The last two digit portion of the part number on the replacement IC should be the same as or higher than that on the removed IC Ensure that pin 1 is oriented correctiy m Similarly replace U150 with the upgraded IC L1 Step 4 Upgrade the A18 Memory board firmware as follows m Remove the A18 Memory board from the card cage The A18 Mem ory board is typically located one slot from the outside left side of the instrument e Onthe A18 Memory board replace t
187. ntenance J16 491 Batte U511 RAM Socket U500 RAM Socket Batter Torx Head Screw 2 E M Eo J30A ir J294 J860 Torx Head Screw 2 Torx Head Screw 2 J18 J83 J35 Removing Replacing the AS Time Base Controiler Board Figure 6 10 Maintenance 6 36 11801B Service Manual Corrective Maintenance A7 CRT Socket Board and A8 CRT Driver Board See Figures 6 1 6 4 6 5 6 7 6 11 6 12 6 13 6 15 and 6 32 for board connector screw and index locations Remove and replace the A7 CRT Socket board and the A8 CRT Driver board as follows L L L E L Step 1 Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover Step 2 Remove the two plastic circuit board guides on top of the card cage Step 3 Remove the two Torx head screws that secure the A7 CRT Socket board cover and then remove the A7 CRT Socket board cover Step 4 Slowly pull the A7 CRT Socket board toward the rear of the instrument to unplug the A7 CRT Socket board from the CRT Step 5 Remove connectors J53 and J56 on the A7 CRT Socket board Note the positions of the multi pin connector s index triangles to ensure that you can correctly replace these connectors The CRT anode voltage is 16 kV To avoid electric shock ground the anode lead from the CHT to the chassis to short any stored charge remaining in the CRT Wait approximately ten minutes then ground the anode l
188. ntrol Rectifier Board Connectors Locations 6 17 Fan Motor Figure 6 2 Removing the Power Supply Rear Plate Fan Housing and Rear Panel Connector Plate 005 6 16 Cathode Ray Tube CRT Figure 6 5 Removing Replacing the Cathode Ray Tube 6 24 Figure 6 12 RHemoving Replacing the A8 CRT Driver Board 6 39 Figure 6 15 Removing Replacing the A10 Front Panel PUNON DOIG pirat paced d oed esq tee E Eat 6 43 Figure 6 32 Multi Pin Connector Orientation and Semiconductor Indexinda DISSI IE uaa cian de Ye be On mA Sra e DEC ae 6 74 Acquisition Unit Figure 6 23 Removing Replacing the A19 Strobe TDH BUNOT BOATO iaaii aTa C E ERR CARRERA OE ALS aa d 6 58 Figure 6 26 Removing Replacing the A26 M F Acquisition INIGICONNEC BOIG nid ebbe gu acis a ance es uL 6 61 Figure 6 32 Multi Pin Connector Orientation and Semiconductor Indexing Diagram i siae va Xe CI RO CC RR Erb 6 74 Batteries Figure 6 10 Removing Replacing the A5 Time Base CONTOS RORI sair CE E OUO NUR RERBA Se COL e v 6 36 Figure 6 19 Removing Replacing the A14 I O Board 6 50 Figure 6 22 Removing Replacing the A18 Memory Board 6 56 Ai Mainframe M F Strobe Figure 6 8 Removing Replacing the A1 M F Strobe Drive Board 6 31 Drive Board Figure 6 32 Multi Pin Connector Orientation and Semiconductor MASXINO DIBOESTTE uu sse oe one ond chet E URERE RU EA 6 74 A3 Mainframe M F Power X Figure 6 2 Removing the Power Supply
189. o OFF Step 2 Remove the AC power cable C Step 3 Position the instrument on its left handle side as viewed from the front C Step 4 Remove the bottom cover 7 Step 5 Locate the A4 Regulator board 7 Step 6 Locate the J820 jumper on the A4 Regulator board 7 Step 7 Reposition the J820 jumper from its two outer right side pins to its two inner left side pins without dropping the jumper Step 8 Replace the bottom cover Turn the instrument in the upright position C Step 9 Reconnect the AC power cable and switch the PRINCIPAL POWER SWITCH to ON The power will now remain on regardless of the setting of the ON STANDBY power switch To prevent damage to the instrument and or sampling head do not install or remove a sampling head while the power is on 7 Step 10 To turn the power off while the ON STANDBY power switch is disabled use the rear panel PRINCIPAL POWER SWITCH To return to normal operation of the ON STANDBY Power Switch follow the preceding steps in reverse order 6 13 Corrective Maintenance A15 Memory Management Unit MMU Ag A14 CRT Driver input Ouput 1 O p A18 Memory A12 Rear Panel A7 CRT Socket A17 Main Processor A13 Mother A5 Time Base Controlier Att Front Panei Button A10 Front Panel Conirol Acquisition Unit Holding Rod A9 Touch Panei Acquisition Unit Delay Line A2 Power Supply Module A3 M F Power Fan Motor Ho
190. o place doing so can bend or break some of the pins If the pins do not slide easily into the receptacles then pull the A7 CRT Socket board away from the CRT and realign the A7 CRT Socket board to the CHT The CRT anode voltage is 16 kV To avoid electric shock ground the anode lead from the CRT to the chassis to remove any stored charge remaining in the CRT Wait approximately ten minutes Then ground the anode load to the chassis again 7 Step 13 Remove connector J54 from the A8 CRT Driver board Note the position of the multi pin connector s index triangle to ensure that you can correctly replace the connector Step 14 Remove the four Torx head screws that secure the CRT to the top of the instrument chassis Two of the screws are removed from the front of the front panel chassis and two of the screws are removed from behind the front panel casting 11801B Service Manual 6 21 Corrective Maintenance 6 22 L Step 15 Remove the top CRT support bar from the instrument The CRT support bar is not attached once the four Torx head screws secur ing the top of the CRT are removed Step 16 Remove the four Torx head screws that secure the CRT to the bottom of the instrument chassis Two of the screws are removed from the front of the front panel chassis and two of the screws are removed from behind the front pane casting Step 17 Remove the bottom CRT support bar from the instrument Once the four Torx head screw
191. on only Record the positions of all connectors to ensure that the connec tors can be correctly replaced C Step 2 Remove the A1 M F Strobe Drive board C Step 3 Remove the A5 Time Base Controller board C Step 4 Remove the A4 Regulator board D Step 5 Remove J90 from the A14 Input Output board To replace the A3 M F Power Connect board perform the previous steps in reverse order To prevent electric shock or damage to the instrument check that the chassis ground wire is replaced on the Power Supply module 6 32 Maintenance Corrective Maintenance Torx Head Screws 2 J60 J95 J57 J96 Figure 6 9 Removing Replacing the A4 Regulator Board 11801B Service Manual 6 33 Corrective Maintenance 6 34 A4 Regulator Board Removal and replacement steps are listed below See Figures 6 2 6 3 6 9 and 6 32 procedures for removal for connector screw and index locations Step 1 Remove the Power Supply module See the Power Supply Module Removal procedure in this section Step 2 Set the instrument upright position if not already in this posi tion Step 3 Remove connectors J57 and J60 from the A4 Regulator board Note the position of the multi pin connector s index triangles to ensure that the connectors can be correctly replaced Step 4 Remove the two Torx head screws from the metal heat sink attached to the rear of this board NOTE Now the A4 Regulator board is n
192. onal Overview Power Supply Typical Waveform Processing Cycle The oscilloscope operates from either a 115 V or 230 V nominal line voltage source at a line frequency between 48 Hz and 440 Hz The LINE VOLTAGE SELECTOR switch allows selection of AC line inputs of 90 V to 132 Vays or 180 V to 250 VRMS To apply power to the instrument 1 Turn the rear panel PRINCIPAL POWER switch to ON 2 Turn the front panel ON STANDBY switch to ON A small green indicator lamp should light indicating the power is on The following is a brief overview of how the oscilloscope acquires proc esses and displays a waveform from the input channels 1 Analog input signals are connected to the sampling head inputs 2 The Time Base Controller block produces precisely timed strobe signals based on the trigger signal 3 These strobe signals are distributed to the sampling head channels and instruct the sampling heads when to take samples of the input signal 4 The Acquisition systems take the output of the sampling heads amplify or attenuate the signals and apply any offset based on the vertical size and position controis 9 The output of the amplifiers are applied to analog to digital A D con verters which convert the sampled voltages to digital codes and then store these codes in the acquisition system memory 6 Once all the samples in a waveform have been acquired the Time Base Controller then transfers these samples from the Acquis
193. oos eer Een Et dee Eee 6 61 Figure 6 28 Removing Replacing the A24 A27 Acquisition Analog BOIS aeie cerea bbe taceo Sb EO fea 6 63 Figure 6 29 Removing Replacing the A25 A28 Acquisition MPU a ire estean Jta uenia icd e aso bacan of adie dl dare es 6 64 Figure 6 32 Multi Pin Connector Orientation and Semiconductor If dextri DIBOTSE mm deco ee eor icta c de us 6 74 6 10 Maintenance Corrective Maintenance Table 6 2 FRU Removal Replacement Figure Cross Reference Cont FRU to be Removed Figures to Reference During Removai Page Replaced A26 Mainframe M F Figure 6 23 Removing Replacing the A19 Strobe TDR Acquisition interconnect SULAR BO cia o tastes Ua iau Eat cus ae a MM EE 6 58 Board Figure 6 25 Removing Replacing the Front Subpanel Assembly 6 60 Figure 6 26 Removing Replacing the A26 M F Acquisition interconnect Board cose Eq Up teak AIR Eua d oque 6 61 Figure 6 27 Top View of the A26 M F Acquisition Interconnect Board 6 62 Figure 6 28 Removing Replacing the A24 A27 Acquisition Analog Boe OS bank arae ier piedad qun iuro pua dedu des cunt Ee qiiod 6 63 Figure 6 29 Removing Replacing the A25 A28 Acquisition MPU BORIS c eI cea Lodo aec ee ROC Wedd a I 6 64 Figure 6 32 Mutti Pin Connector Orientation and Semiconductor Kaera Be pi od esconde oi Edd E eda di 6 74 A24 A27 Acquisition Analog Figure 6 23 Removing Replacing the A19 Strobe TDR Boards Bufor BOAI a pase igre uiua fob e iter eo eee para nie es 6 58
194. or in Regulator 50V Regulator J66 arr Ei 5V Digital J64 Regulated Regulated Power Power Sense J95 amp J96 Figure 9 4 A4 Regulator Board Block Diagram 9 10 Diagrams Block Diagrams Self Tests Oscillator Diagnostics Feedback Trigger Recognizer Strobe Drive to Trigger Sirobe Distribution Time Base Strobe Sense From Strobe Distribution Direct Trigger input TDR Drive to Strobe Distribution isiti To From ion n Em Acquisition System interface Through Strobe Distribution To From s MMU n i Interface RAM ROM Figure 9 5 A5 Time Base Controller Board Block Diagram CONVERGENCE Q Red RED Adjustment From A15 MMU Green GREEN Adjustment O Amplifier Blue To CRT BLUE Adjustment Amplifier Figure 9 6 A7 CRT Socket Board Block Diagram 11801B Service Manual 9 11 Block Diagrams Red From A15 MMU Green Blue RED Adjustment Q GREEN Adjustment BLUE Adjustment Q Synchronization 9 12 O H LIN Adjustment O H POS Adjustment Q H SIZE Adjustment Horizontal Sweep Circuit Coils Grid Bias Raster Scan CRT A7 CRT Socket Board See Figure 9 6 Heater Beam Current Limit Coils High and Grid Voltage Generator Vertical Sweep Circuit O VERT SIZE Adjustment O VERT POS Adjustment Figure 9 7 A8 CRT Driver Board Block Diagram Diagrams
195. or circuit The basic function of the CRT Controller is to produce VIDEO and SYNC signals that indicate to the CRT where to position video information The controller is virtually automatic in operation and invisible to the firmware programmer except for several internal registers that must be initialized at power on The video output circuitry is where the hardware recognizes and displays specific data structures while the raster scan CRT displays the contents of the bit map During the refresh of the screen the hardware acquires bit map data along with waveform display data to yield a final color index The compressor circuit receives a waveform composed of several possible numbers of data points and outputs 512 pairs one minimum and one maximum to the display Microprocessor The microprocessor transforms the entire Display subsystem into an intelli gent peripheral dedicated to operating the display The firmware that con trols the Display subsystem executes from ROM in the microprocessor s address space The clock for this microprocessor operates at a frequency of 8 MHz Bit Map RAM This memory consists of 256 Kbytes of RAM divided into 4 bit planes of 65 536 bytes each Three of the bit planes are for text and the remaining bit plane is for XY variable persistence and infinite persistence Each bit in a plane represents a single pixel of the display Setting the representative pixel bit in each of the planes controls the col
196. or on the RS 232 C connector on the rear panel of the instrument GPIB Inrpt Reset These tests verify the Executive processor interface to Reset Status the internal GPIB circuitry The major external GPIB func Data Lines tions are not tested interrupt This test requires operator interaction and can be ex ecuted only in the Routine pop up menu with the All and Loop modes set to Off Before executing this test you should unplug the GPIB connector from the instrument 11801B Service Manual 6 97 Diagnostic Troubleshooting 6 98 Display Subsystem Error Index Codes The Display subsystem error index codes and suspect FRUs are listed in Tabie 6 13 Table 6 13 Display Processor Kernel Error Index Codes Error Indexp Suspect Hybrid Suspect Board FRUs IC FRUs 1 4 FW MMU as MMU The name of the first Display kernel test that fails is displayed on the screen The Display processor error index code is read from the A15 MMU board test points DIAGO LSB to DIAG2 MSB The bits are high 5 V true The status LEDs DS201 and DS200 on the A15 MMU board will flash while the Kernel diagnostic tests are executing If a kernel failure is detected then one or both LEDs will remain on Table 6 14 lists the various LED configura tions and their significance See Figure 6 34 for the location of these test points and status LEDs Table 6 14 Display Processor Status LED Configuration DS200 DS201 Significance ON ON
197. or or intensity 3 21 Block Diagram Descriptions Waveform Display RAM This memory consists of 65 536 bytes These bytes contain the min mum maximum pairs of values color index and overrange underrange information Video Digital to Analog Convertor DAC This circuitry converts the digital data from the Display IC into analog data for the A7 CRT Socket board A17 Executive The A17 Executive Processor board consists of the following circuitry Processor Board Executive processor EXP amp Numeric coprocessor circuitry m Bus buffer circuitry w Preset circuitry amp Wait state circuitry m interrupt controllers DMA Controller See Figure 9 11 for a block diagram of this board Executive Processor EXP This microprocessor executes firmware routines stored in EPROMS that are located on the A18 Memory board to control the operation of the oscillo scope Along with the numeric coprocessor the EXP does all data process ing not directly related to generating the display or digitizing the waveform When power is first applied to the oscilloscope the EXP executes local and system diagnostic tests which are located in the EPROMs on the A18 Memory boatd The EXP performs these functions with the following three main circuits w the clock generator creates the timing signals and synchronized reset signals for the microprocessor m the microprocessor reads and writes data generates addresses for I O and memory d
198. or some tests requiring human inter action such as touch panel interactive tests various display tests and CRT touch pane calibration patterns The knobs control the screen intensity during the four main diagnostics menu levels The TOUCH PANEL ON OFF button enables disables the touch panei response to user touches 118018 Service Manual 6 85 Diagnostic Troubleshooting Diag nostic Terminal The RS 232 C port drives a terminal which conforms to the ANSI 3 64 stan dard In this mode the terminal provides a screen driven interactive human Mode RS 232 C as This mode is useful when either the display or touch panel is not functioning properly or when it is desired to remotely use the diagnostics with a modem and phone link There are several single terminal keystroke commands which are equivalent to front pane buttons or are terminal only commanas all of which do not appear on any of the display screens The following terminal keystrokes do appear on the screen and are shown in quotes B lt baud rate cr this keystroke followed by the baud rate and carriage return allows you to change the default baud rate to any one of the allowable product baud rates 300 1200 9600 19200 The default power up baud rate is determined from the position of two internal jumpers located on the A14 I O board The Default setting is for 9600 baud T this keystroke toggles the screen output between the current scre
199. or your instrument Performance Verification Performance Verification 11801B Test Record Instrument Serial Number Certificate Number Temperature o rts HH 96 Date of Calibration een Technician Performance Test Minimum incoming Outgoing Maximum Vertical Accuracy Vertical Gain First Compartment 1 2 at checkpoint Step 11 5 mV div 20 5 mV 19 5 mV 10 mV div 41 0 mV 39 0 mV 20 mV div 82 mV E 78 mV 50 mV div 205 mV 195 mV 100 mV div 410 mV 390 mV 200 mV div 820 mV 780 mV 5 mV div 19 5 mV 20 5 mV 10 mV div 39 0 mV 41 0 mV 20 mV div 78 mV 82 mV 50 mV div 195 mV 205 mV 100 mV div 390 mV 410 mV 200 mV div 780 mV 820 mV Vertical Offset Accuracy First Compartment 2 mV Step 10 400 mV 398 mV 402 mV Step 11 1V 0 998 V 1 002 V 2 V 1 998 V 2 002 V 400 mV 402 mV 398 mV 1V 1 002 V 0 998 V 2V 2 002 V 1 998 V 11801B Service Manual 4 7 Performance Verification 11801B Test Record Cont Performance Test EEE RE ESE ASSERT SE ES NS PT UITAE TEEC SEAL T E T E EEEE Ne MM bv AR Sa aR ih eH CREE Vertical Gain Second Compartment Minimum Incoming Outgoing Maximum i 1 296 at checkpoint Step 11 5 mV div 20 5 mV 19 5 mV 10 mV div 41 0 mV 39 0 mV 20 mV div 82 mV 78 mv 50 mV div 205 mV 195 mV 100 mV div 410 mV 390 mV 200 mV div 820 mV 780 mV 5 mV div 19 5 mV 20 5 mV 10 mV div 39 0 mV 41 0 mV 20 mV div 78 mV
200. ot attached to the chassis How ever it remains connected to the A3 M F Power Connect board through interconnecting pins C Step 5 Carefully unplug the J95 and J96 pins from the A4 Regulator board by pulling the A4 Regulator board toward the rear C Step 6 Remove the A4 Regulator board To replace the A4 Hegulator board perform the previous steps in reverse order NOTE Match the index triangle on the multi pin connectors with the corre sponding square pad on the circuit board Maintenance Corrective Maintenance A5 Time Base Controller Board Removal and replacement steps are listed below See Figures 6 10 and 6 32 for connector screw and index locations 7 Step 1 Place the instrument in the inverted position Step 2 Remove connectors J16 J29A J30A J32 J35 J91 and Extatt from the A5 Time Base Controlier board Then remove connectors J18 and J83 from the A5 Time Base Controller board Note the position of the multi pin connector s index triangles to ensure that the connectors can be correctly replaced NOTE Record the positions of the connectors and the receptacles to ensure that these connectors and receptacles will be positioned correctly when reinstalled Step 3 Remove the six Torx head screws holding the board in place L Step 4 Remove the A5 Time Base Controller board To replace the board perform the previous steps in reverse order 11801B Service Manual 6 35 Corrective Mai
201. other than Tektronix representatives to install repair or service the product b to repair damage resulting ftom ii improper use or connection to incompatible equipment or c to service a product that has been modified or integrated withr other products when the effect of such modification or integration increases the time or difficulty of servicing the dd MEE THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER i WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES 66 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OB rac REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR gt 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 st Ee Cha X I Y ob F mM bruma Praia cR La act MON D NLDAL Gn NT GC NN PUMA UA AANA iM SN AL QE ACLU B ed m Nr arn C wien LU gr La brune shil wiran ean dr oi d Ms vl Ree Specification Operating Information Theory of Operation List of Figures assnusrrsanrean List of Tables eeeeeeeeee ee ee ee Safety Summary eeeeeeeeeeeeeeeee SDecificatons sides vx xax EE ERAS Operating Information W QD X NB TY NH NH
202. oving Replacing the A15 MMU Board 6 52 Maintenance 118015 Service Manual Corrective Maintenance A17 Executive Processor EXP Board See Figures 6 4 6 7 6 21 and 6 32 for board connector screw and index locations Remove and replace the A17 Executive Processor board as follows L Step 1 Remove the three Torx head screws that secure the CRT cover L L and then remove the CRT cover Step 2 Remove both of the plastic board guides from the top of the card cage The guides are retained by two small catches located in two holes in the left bracket of the card cage The other ends of the guides contain siots which attach to the edge of a metal bracket Both ends of the guides can be pried loose Step 3 Remove connector J77 from the A17 Executive Processor board Note the position of the multi pin connector s index triangle to ensure that you can correctly replace this connector L Step 4 Lift the white hinged tabs at the front and rear edges of the EJ board Pull the tabs upward until the A17 Executive Processor board separates from the A13 Mother board Step 5 Remove the A17 Executive Processor board To replace the A17 Executive Processor board perform the previous steps in reverse order NOTE Insert the board edges into the plastic guides at each end of the card cage Lower the board into position Ensure that connector P104 on the A17 Executive Processor board is seated onto the of A13 Mothe
203. oving Replacing the A4 Regulator Board 6 33 Multi Pin Connector Orientation and Semiconductor Indexing Dadian s eios rae eto en RENE RR A RR Ea 6 74 Removing Replacing the A5 Time Base Controler BOSEG 24 ue bac ir ria tl i e aO CD AERE ER 6 36 Mutti Pin Connector Orientation and Semiconductor Indexing DIBOFBlmi co oed AC AC NALA eor pR S E CR DUE EE 6 74 Removing Replacing the A7 CRT Driver Board 6 38 Multi Pin Connector Orientation and Semiconductor Indexind Dadam as sqaccep ed rre aekin taco eRTY mana 6 74 Removing Replacing the Cathode Ray Tube 6 24 Removing Replacing the A8 CRT Driver Board 6 39 Removing Replacing the A10 Front Panel PUNON POSU cse ette Rana acinis Oo Eos CORONA ewan 6 43 Mutti Pin Connector Orientation and Semiconductor Indexing DIGAN 252p o ich ACE REN EADEM EU a 6 74 Removing Repiacing the Cathode Ray Tube 6 24 Removing Repiacing the A10 Front Panel Dutton BOSE srira xd eon eit ei dE nct UAE See s 6 43 Multi Pin Connector Orientation and Semiconductor Index Diagram 415 2 ce lak dcc OE c c wind oh a 6 74 Removing Replacing the Cathode Ray Tube 6 24 Removing Replacing the A10 Front Panel GURON BOA suse otros echar ie enna hada CS AUR 6 43 Mutti Pin Connector Orientation and Semiconductor INGEXING Diagram rs acts nme Un rarae le ed RH Heine 6 74 Removing Replacing the Cathode Ray Tube 6 24 Removing Replacing the A1
204. pear on the display This is normal To remove the impurity repeat Step 40 C Step 41 Set the ON STANDBY switch to STANDBY Step 42 Replace the CRT Socket board cover and the CRT cover ee a VVTV M CNN ccr NES 11801B Service Manuai 5 17 Adjustments FOCUS 1e MANN S1 1 l ll ll h HlLLLLLJA VERTICAL POS R311 H POS R500 H SIZE R501 h H LIN R502 TOS Org OSN A VERT SIZE L321 Figure 5 4 A8 CRT Driver Board Adjustment Locations 5 18 Adjustment Procedures Adjustments GREEN R201 RED BLUE R200 R203 CONVERGENCE R210 Figure 5 5 A7 CRT Socket Board Adjustment Locations 11801B Service Manual 5 19 Adjustmenis Real Time Clock This procedure verifies the correct operation and accuracy of the oscillo scope s input output systems see Figure 5 6 This procedure should be performed only if maintenance is required Its use is not necessary for verifying instrument specifications Measurement Limits The measurement limit for the real time clock is 1 000 000 us x5 HS Setup to Examine Adjust Real Time Clock CH 1 11801B m E di sd y m o Frequency C 9 Counter 9 A14 To TP310 HO Board To Ground see Figure 5 6 Test Point Procedure to Examine Adjust Real Time Clock Step 1 Initialize the oscilloscope settings as follows OHLY DURO Ciara roe er ors ibo gu dad esit CU oc Le atest aes press initialize in major menu 2 0
205. play BAM ues ehm ene ed Video Digital to Anaiog Convertor DAC sese A17 Executive Processor Board 0 ec cc teen enaaee Executive Processor EXP eeeeeeeeeeeeeeeeee cena Numenecoprocess E 24 ua d I ey RC Roca tace sce Ss Bus Controller Reset Wait State o X Re Bo Boo ho 8 3 4 3 amp 838 bo a P amp X Mo4 o ROROG 0 3 o 3 Y X Bob oh o bBOoK So Roh B3 Go X So Ga oa bBo 9 b o BOR OR SOR X b amp 4 a ROB 8 8 38 MORM 9 bh WV A4 9 3 3 9 934 3 mW k VW Into rupt Controllers co vecta eoa FAC e ewes DMA Controller A18 Memory Board Address Latches Address Decode EPROMs SRAM ae 2 3 BG o0 Co o 0 Boa o b k Bot b 5 X M EK 9 amp P Y B 4 Boh E 9 4 Ah EH X NH G3 Kk Y W Ro Ck o X KK Wo X W k g ES G3 KR ON XY X W M Mo 8 92 9 MW K NW HORA boh O A OR S3 GG KS S C 4 G A o hob 9 VW oA OW MO3AS E P B oK 3 9 ac and Memory Select 0000s eee and NVBAM xa He Ee t sE apre Ip MER Memory Data BUMBIS acier re EEUU ERU Bd C Watt State Generator uus es d aer Ec e pex AIR da SE od Wait State Diagnosti6s seers ELE ERAT RN ERA ERES Memory Configuration Readback ss sess Battery Backup 4 4 4 Ko oh oh oh bBo RoOEX E K 4 a3 a 3 h b K RO X 3 9 3 A19 Strobe TDR Buffer Board 002 eee eee eens Strobe Sense Select 2x lt a teca ERE QE Pid Ga ORA
206. ption Mfr Mfr Part No Index Part No Effective Dscont Code No STANDARD ACCESSORIES 10 8 1 161 0066 00 1 CABLE ASSY PWR 3 18AWG 98 L 0B445 ECM 161 0066 00 ea 161 0154 00 1 CABLE ASSY PWR 3 1 00MM SQ 250V 10A 2 5M 3109 12 HO5VVF3G 00 OPTION A5 ONLY 8 161 0066 12 1 CABLE ASSY PWR 3 18 AWG 98 L 29870 ORDER BY DESC OPTION A4 ONLY 4 161 0066 11 1 CABLE ASSY PWR 3 1 00MM SQ 250V10A 2 5M 3109 198 000 OPTION A3 ONLY 5 161 0066 10 1 CABLE ASSY PWR 3 0 1MM SQ 250V 2 5 M 3109 BSA43 HO5VVF3GO OPTION A2 ONLY 6 161 0066 09 1 CABLE ASSY PWR 3 0 75MM SQ 220V99 0 L S3109 86511000 OPTION A1 ONLY 174 1120 00 2 CAASSYRF COAXIAL RFD 50 OHM 8 0 L TK2469 ORDER BY DESC 174 1364 00 1 CABLE ASSYRF 12 0 LO N TK2469 ORDER BY DESC 070 8784 00 1 MANUAL TECH PROGRAMMER 11801B CSA803A 80009 070878400 070 8783 00 1 MANUAL TECH USER 11801B 80009 070878300 070 8781 00 1 MANUAL TECH SERVICE 118018 80009 070878100 OPTIONAL ACCESSORIES 012 0555 00 1 CABLE INTCON CENTRONIX 3 METERS LONG TK1416 DKIT 0034HCZ2Z 012 0911 00 1 CABLE INTCON MOLDED RS232 10 FT TK2435 ORDER BY DESC 012 0991 00 th CABLE COMPOSITE IDC GPIB 2 METER 00779 553577 3 012 0991 01 1 CABLE GPIB LOW EMI 1 METER 00 79 553577 2 012 1220 00 1 CA ASSY SPELEC 1 METER LONG TK2469 ORDER BY DESC 012 1221 00 1 CA ASSY SBELEC 2 METER LONG TK2469 ORDER BY DESC 200 3395 00 1 COV SMPLG
207. quisition unit Step 4 Remove the four screws on the gold colored locking bar located on the top front of the Acquisition unit Step 5 Turn the Acquisition unit in the inverted position and repeat Steps 3 and 4 on the bottom of the Acquisition unit Step 6 Remove connectors J11 J12 J13 and J14 on the A26 M F Acquisition Interconnect board Note the position of the multi pin con nector s index triangle to ensure that the connector can be correctly replaced J11 eatery ePePeteteterere a oetereterererereteteteretets E T s s ce 88 8 ts 8 nt nn n O ose J12 BRRRHERRRRAERAREREARRAERRRIRIAERNEEREEIEERRRRRREERAEREEE EEEIEE err Terre EEEE Perse er rer sere re eeeer errr cir cere seers COE Poe eee cee h ss eter e sete sesesesssnesses massecs setae De geben se Sp bese sus sosescsssnonesecsnsseonkosoeseseosene J13 J14 J10 Figure 6 26 Removing Replacing the A26 M F Acquisition Interconnect Board 118018 Service Manual 6 67 Corrective Maintenance C Step 7 Remove the Front Subpanel assembly with the head intercon nect boards intact C Step 8 Remove the six Torx head screws to remove the A26 M F Acaui sition interconnect board To replace the A26 M F Acquisition Interconnect board perform the previous steps in reverse order Acquisition Unit Chassis A26 M F Acquisition interconnect Board IEREWLIDBAR reese e
208. r m part number m instrument type or mode number m instrument serial number w 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 11801B is serviced by module replacement so there are three options you should consider m 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 infor mation about the module exchange program call 1 800 TEKWIDE ext BV 5799 m Module Repair You may ship your module to us for repair after which we will return it to you m New Modules You may purchase new replacement modules in the same way as other replacement parts 10 1 Replaceable Parts U sing the The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you ind the ail the information you need Tor ordering replacement parts Aap rie find the all the inf df deri i Item Names In the Replaceable Parts List an Item Name is separated from the descrip tion by a colon 2 Because of space limitations an Item Name may some
209. r Board Test Point and Adjustment Locations 5 10 Adjustment Procedures Adjustments Setup to Examine Adjust Regulator Reference 11801B EEA To Ref Test Point To Com Test Point Regulator Board see Figure 5 3 Procedure to Examine Adjust Regulator Reference 7 Step 1 Make the connections shown in the setup and Figure 5 3 dia grams Check that the oscilloscope power is ON C Step 2 With the Digital Voltmeter in DC Voltage mode check the Volt meter for a reading within the limits of 9 95 V and 4 10 05 V D DO NOT attempt to make the following adjustment to R730 if the reading is within the stated limits Instead proceed to Step 4 To prevent electric shock use extreme caution when making the following adjustment Access the test points from the right side of the oscilloscope C Step 3 Adjust the 10 V Ref R730 on the A4 Regulator board to 10 00 V 7 Step 4 Remove the test leads a Step 5 Initiate Power On Diagnostics see the Performance Verification section 11801B Service Manual 5 11 Adjustments Com Test Point Ref Test Point Figure 5 3 A4 Regulator Board Test Point and Adjustment Locations 5 12 Adjustment Procedures Adjustments Display This procedure shows the setup and lists the steps to examine adjust the A7 CRT Socket board and the A8 CRT Driver board see Figures 5 4 and 5 5 Q5 The adjustments in this procedure affect only t
210. r be more than the total number of routines in the subsystem If no tests have been executed or no failures have occurred this field is blank Since the failure count field is an indication of all routines that have failures it is possible to have a failure field count greater than the loop count for example there may be five routine failures after the first loop A field display of 65535 indicates that the Failure Count field has gone beyond 65534 and that an overflow condition has occurred The following field descriptions apply only to Routine menus a Test Results fields contain information useful for troubleshooting One of the following formats is used u test address expected data and actual data w expected data lower bound minimum expected data upper bound maximum and actual data Diagnostic Menu Hardcopy Press the hardcopy button on the front pane to make hardcopy of the diagnostic menu The hardcopy is sent to a printer attached to the PRINTER port Screen hardcopies can also be obtained from other menus for exam ple help menus interactive test menus and hardware debugger menus After a hardcopy is output a Form Feed is issued to the printer l no printer is attached or the printer can not print for example if the printer is off line or if the printer is out of paper then the foliowing warning is shown in the Input Prompt area Hardcopy absent or off line The hardcopy function is unavailable f
211. r board connector Push down firmly on the A17 Executive Processor board to seat this connector on the A13 Mother board 6 53 Corrective Maintenance J77 Front of Oscilloscope P104 To A13 Mother Board Connector Figure 6 21 Removing Replacing the A17 Executive Processor Board 6 54 Maintenance Corrective Maintenance A18 Memory Board See Figures 6 4 6 7 6 21 6 22 and 6 32 for board connector screw and index locations Remove and replace the A18 Memory board as follows Step 1 Remove the three Torx head screws that secure the CRT cover and then remove the CRT cover C Step 2 Remove both of the plastic board guides from the top of the card cage The guides are retained by two small catches located in two holes in the left bracket of the card cage The other ends of the guides contain slots which attach to the edge of a metal bracket Both ends of the guides can be pried loose 7 Step 3 Remove connector J77 from the A17 Executive Processor board Note the position of the multi pin connector s index triangle to ensure that you can correctly replace this connectors _ Step 4 Lift the white hinged tabs at the front and rear edges of the board Pull the tabs upward until the A18 Memory board separates from the A13 Mother board C Step 5 Remove the A18 Memory board To repiace the A18 Memory board perform the previous steps in reverse order NOTE Insert the edges of the board
212. r has a byte of data Inbyte Register from the GPIB bus that the microprocessor needs to read m the transmitter section register Outbyte Register is empty and is ready to receive another byte of data m the status of the GPIB bus or the GPIB controller has changed and the microprocessor has to be notified On the opposite side of the GPIB controller is another bus system This other bus system includes an eight bit data bus which accesses a bidirec tional GPIB data buffer and an eight bit control bus which accesses a GPIB control driver The GPIB bus is connected to the opposite side of the buffer and control driver These two devices are specially designed to be TTL signal level compatible on the bus side of the buffer driver The states of three control signals from the GPIB controller SRO NRFD and NDAC are monitored and displayed on the rear panel of the oscilloscope These LEDs show the state that the GPIB controller is in not the state of the GPIB bus Two other signals of interest are GPIB RQ and GPIB GR These signals are used by the DMA Controller on the A17 Executive Processor board to com municate with the GPIB controller The DMA can be programmed by the microprocessor to service either the Inbyte register or the Outbyte register Standard RS 232 C Controller This communications controller is connected to the same data bus and address bus as the GPIB controller The RPD7 RPDO address lines transfer data to and from the
213. r s index triangles to ensure that you can correctly replace these connectors C Step 10 Lift the A8 CRT Driver board partially out of the instrument chassis _ Step 11 Remove connectors J54 and J55 from the A8 CRT Driver board Note the position of the multi pin connector s index triangles to ensure that you can correctly replace these connectors C Step 12 Remove the A8 CRT Driver board and the A7 CRT Socket board C Step 13 Unsolder the two wires that connect the AB CRT Driver board to the A7 CRT Socket board the two boards are now separated To replace the A8 CRT Driver board and the A7 CRT Socket board perform the previous steps in reverse order Solder Points J56 J53 Figure 6 11 Removing Replacing the A7 CRT Socket Board 6 38 Maintenance Corrective Maintenance Torx Head Screw J52 457 J56 454 Figure 6 12 Removing Replacing the A8 CRT Driver Board 11801B Service Manual 6 39 Corrective Maintenance A9 Touch Panel Assembly Removal and replacement steps are listed below See Figures 6 5 6 15 and 6 32 for connector screw and index locations Remove and replace the A9 Touch Panel assembly as follows Step 1 Set the instrument on its right side The CRT will now be at the top 7 Step 2 Use a 1 16 inch Allen wrench to loosen the small Allen screws in each of the two control knobs C Step 3 Slowly remove the two control knobs so that you do not lose the smali Allen sc
214. rame Acquisition NCI CONNEC BONO sa axe ates zo Xd ERE ER VEMM IE Rs 6 62 Figure 6 28 Removing Replacing the A24 A27 Acquisition AnatOd BOAS xuvisttexeeeLheiqedaibasedxeS Ubgete epu RA 6 63 Figure 6 29 Removing Repiacing the A25 A28 Acquisition MPU BOGGS pU p 6 64 Figure 5 30 FRU IC Detail 4 Ea REPE EA ERE RR 6 67 Figure 6 31 IC Insertion Extraction Tool Luusuuss 6 69 Figure 6 32 Multi Pin Connector Orientation and Semiconductor INGEXING Diada escenas rere re REPRE SM REPE 6 74 Figure 6 33 A17 Executive Processor Board Test Point and Status LED LOCATIONS A nope ed eC Epi Edo ied rn 6 95 Figure 6 34 A15 MMU Board Test Point and Status LED Feci M PPP 6 99 Figure 6 35 A5 Time Base Controller Board Status LEDs 6 101 Figure 6 36 A25 A28 Acquisition MPU Board Status LEDs 6 102 Figure 6 37 A14 I O Board Fuse Locator Diagram 6 107 Figure 7 1 Power Cord Plug Identification ussususu 7 2 Figure 9 1 11801B System Functional Block Diagram 9 2 Figure 9 2 11 01B Detailed Block Cabling Diagram 9 3 Figure 9 3 A1 M F Strobe Drive Board Block Diagram 9 9 Figure 9 4 A4 Regulator Board Block Diagram 9 10 Figure 9 5 A5 Time Base Controller Board Block Diagram 9 11 Figure 9 6 A7 CRT Socket Board Block Diagram 9 11 Figure 9 7 A8 CRT Driver Board Block Diagram 7 9 12 Figure 9 8 A12 R
215. rating at 8 MHz Real Time Clock This clock and its oscillator circuit maintain the current time of day The EXP sets the real time clock and also interrupts the Executive processor EXP every one second to request the EXP to read the time Serial Data Interface SDI This circuitry is a custom IC that interfaces the EXP to both front panel knobs The EXP controls this IC and this IC interrupts the EXP when a device requires service Tone Generator This circuitry utilizes a DAC and a timer The timer is equipped with a special current switch and capacitor to set the timer s frequency The timer outputs a square wave whose frequency is inversely proportional to the digital value written to the temp tone DAC Thus if a zero value is input to the DAC the tone generator produces the highest tone Temp Tone Readback Buffer This circuit is an eight line buffer connected to the I O data bus The EXP uses this buffer to monitor the tone generator Block Diagram Descriptions A15 Memory The A15 MMU board consists of the following circuits Management MMU wwuic Board B Waveform RAM m Display interface Time Base Controller interface w Executive processor EXP interface g Display IC m Microprocessor m Bitmap RAM B Waveform display RAM circuitry m Video DAC The A15 MMU board coordinates communications among the following three oscilloscope subsystems w Display x Time Base Controlier m Executive See Fig
216. ration In situations where the Display Time Base or Acquisition processors have failed their kernel diagnostics exiting diagnostics to normal operation will not be possible After the Self Test Extended Diagnostic programs have executed any resul tant error index codes appear on the display next to the associated subsys tem name in the Extended Diagnostics menu Each subsystem that had a failure gives the first error encountered and the number of failures in the subsystem To get a more complete list of the error index codes in a subsystem touch the selector of a failed subsystem if the failed subsystem is not already selected and then touch the Block selector Touching the Area and then Routine selectors shows the lowest level test routines in the selected Block The currently selected Subsystem Block Area and Routine are shown below their labels at the bottom of the Extended Diagnostics menu Several function and operating mode selectors are also available at the bottom of the screen When certain test routines are selected some of these operating modes are non selectable Additionally when some of the operating modes are set to certain states some of the test routines may become non selectable The function and mode operators are listed below m Help displays a list of FRUs for the currently selected routine If the routine had a failure then the error index code for that routine is also displayed The FRUs are nor
217. rement as follows MEASURE BUB acier dei reme tdeo Pe A ERR Dress Measurements in major menu sss seres touch Mean in pop up menu eeeeeeeeeeeeeee eene touch Compare amp Reference in major menu Lus touch Save Current Meas Values as References if BODSUpdqnerid seiceanna Re EP hr Ren ie oe eek touch Compare off changes to on in pop up menu touch SAEC 3 Wammmmmmmmmmmmmmmmmmmmmmmmcicrmmikiki a touch L Step 7 Set the Vertical Size and Offset as follows Mertical siZB IGOD acid ea eee i nee eet touch Adjust the Vert Size M2 to 10 mV div adjust upper knob Vert Offset M2 in major menu 6 eee ee touch Key in 400 mV 400m on the pop up display touch Sele UENO os ccna pee ae ep ee dte ade et touch Check that 400 mV has now entered into the display below Vert Offset M2 C Step 8 Connect the Voltage Source to the DIRECT input of the Calibra tion Head Step 9 Adjust the Voltage Source to 400 mV C Step 10 Wait for averaging to complete Then check that AMean value is between 2 mV and 2 mV O Step 11 Repeat Steps 2 through 10 for the offset values shown in Tabie 4 4 C Step 12 Power down the oscilloscope Repeat Steps 1 through 11 for all sampling head compartmenis 4 29 Performance Tests Tabie 4 4 Vertical Offset Test Values Sens Source V Lower Spec Upper Spec Vert Offset 10 mV div 1V 0 998 V 1 002 V 10
218. rews inside the knobs C Step 4 Remove the two Torx head screws at the bottom of the A9 Touch Panel Assembly Step 5 Lift up on the bottom of the A9 Touch Pane Assembly and swing the assembly outward NOTE The top of the A9 Front Panel Assembly is held by two tabs These tabs fit into two slots in the front panel chassis L Step 6 Remove the black ground wire from the quick disconnect ground connector on the front panel casting Step 7 Remove connector J73 from the A10 Front Panel Control board Note the position of multi pin connector s index triangles to ensure that you can correctly replace this connector Carefuily remove the wire cable through the slot provided in the front casting Cover the A9 Touch Pane Assembly with protective material once it is removed since the plastic exterior may scratch To replace the A9 Touch Panel Assembly board perform the previous steps using the reverse process NOTE Feed any slack cable from connector J73 to inside the chassis near the A710 Front Panel Control board Be careful to not pinch the interconnecting cable while replacing the front panel bezel 6 40 Maintenance Corrective Maintenance pe A9 Touch Panel i Torx Head Screws 2 Assembly c ie Front of instrument as Viewed from the Bottom Figure 6 13 A9 Touch Panel Assembly Torx Head Screws J73 Connector Figure 6 14 Removing Replacing the A9 Touch Pane Assembly 11801B Service Man
219. s held in place with two tabs that hook under the top of the chassis Pull the assembly out until you can access the black ground wire that con nects the A9 Touch Panel Assembly to the instrument chassis C Step 6 Remove the quick disconnect ground connector that connects the black ground wire to the instrument chassis 6 20 Maintenance Corrective Maintenance C Step 7 Set the A9 Touch Panel Assembly aside To avoid stressing the ribbon cable that is still connected to the A9 Touch Pane Assembly and to keep the assembly from cluttering your work space place the A9 Touch Panel Assembiy on top of the sampling head compartments Do not damage the A9 Touch Panel Assembly when placing it on top of the sampling head plug in compartments L Step 8 Carefully set the instrument on its left side a Step 9 Remove the two plastic circuit board guides from the top of the card cage C Step 10 Remove the two Torx head screws that secure the A7 CRT Socket board cover Use a short Torx head screwdriver to remove the rear most Torx head screw Step 11 Remove the A7 CRT Socket board cover Step 12 Slowly pull the A7 CRT Socket board towards the rear of the instrument to unplug the A7 CRT Socket board from the CRT NOTE When reattaching the A7 CRT Socket board to the CRT align the pins of the CRT to the receptacles on the A7 CRT Socket board Then slowly push the pins into the receptacles Do not force the connection int
220. s J72 J77 J78 and J90 from the A14 VO board Note the position of multi pin connector s index triangles to ensure that you can be correctly replace these connectors 7 Step 4 Lift the white hinged tab at the upper front edge of the board Pull the tab upward until the A14 I O board separates from the A13 Mother board _ Step 5 Remove the A14 I O board To replace the A14 I O board perform the previous steps in reverse order NOTE insert the board edges into the plastic guides at each end of the card cage Lower the board into position Ensure that connector P105 is seated on ihe A13 Mother board connector Push down firmly on the A14 I O board to seat this connector on the A13 Mother board A lithium battery BT130 is mounted on the A14 I O board Be careful when placing the A14 I O board on metal surfaces If some IC or battery leads are shorted the battery may discharge or over heat and vent You can use plastic standoffs to prevent short circuits This battery requires special handling for disposal Refer to the instructions on Lithium Battery Disposal and First Aid earlier in this section 11801B Service Manual 6 49 Corrective Maintenance J78 J77 J90 J72 Front of Oscilloscope P105 Lithium Battery to A13 Mother Board BT 130 Connector Figure 6 19 Removing Replacing the A14 I O Board 6 50 Maintenance Corrective Mainienance A15 Memory Management Unit MMU Board See Figures 6 4
221. s are removed from the bottom of the CRT the CRT is not attached to the instrument Use care to not damage the CRT while it is loose in the instrument Step 18 Slowly pull the CRT out of the front panel chassis To repiace the CRT perform the previous steps in reverse order NOTE Replacing the CRT will require that the instrument be readjusted Maintenance Corrective Maintenance CRT Cover CRT Cover Torx Head Screws 3 Figure 6 4 Removing Replacing the CHT Cover 11801B Service Manual 6 23 Corrective Maintenance A7 CRT Socket A7 CRT Socket Board Cover Board Cover Torx Head Screws 2 Oo ps s Transformer ee E RP 2 Torx Head Screw Removed Transformer Cover 1 IT gi 9e A10 Front Panel Control Board A8 CRT Driver Board AS Touch Panel ve Assembly Anode Lead Cap CRT Figure 6 5 Removing Replacing the Cathode Ray Tube 6 24 Maintenance Corrective Maintenance em Torx Head Screws 4 Top CRT Support Bar Pd Quick disconnect eo i 3 Screws 4 p s ana SSSA Ground Connector E Bottom CRT Support Bar Figure 6 6 Removing Replacing the CRT Torx Head Screws 11801B Service Manua 6 25 Corrective Maintenance Acquisition Unit See Figures 6 23 6 26 and 6 32 for connector screw and index locations Removal Remove and replace the Acquisition unit as follows the Acquisition unit can Replacement be removed wit
222. s the power to the interconnections between the following boards m A24 A27 Acquisition Analog board m A25 A28 Acquisition MPU board m A20 A23 Head Interconnect boards See Figure 9 14 for the block diagram of this board The A26 M F Acquisition Interconnect board also has a precision voltage reference V to furnish the 5 V reference required by the A24 A27 Acquisi tion Analog board The Acquisition system consists of four boards the A24 A27 Acquisition Analog boards and the A25 A28 Acquisition MPU boards The A24 A27 Acquisition Analog board consists of the following major blocks Programmable gain amplifiers m A D converters m Measurement hardware g Timing and sampling head control The A25 A28 Acquisition Analog board consists of the following major blocks m Shared RAM a Tme base controller interface amp Microprocessor m Measurement hardware w Timing and sampling head control See Figures 9 15 and 9 16 for the block diagrams of these boards Programmable Gain Amplifiers The four sampling head outputs are multiplexed to two amplifier channels through the input multiplexer The microprocessor selects a sampling head channel to be acquired and connects it to one of the amplifier channels The programmable gain amplifier then applies offset Vert Pos and amplifies or attenuates the signal Vert Size The output of the amplifier is applied to the analog to digital A D converter for conversion to digitized da
223. s when replacing this unit To replace the Acquisition unit perform the previous steps in the reverse order 6 26 Maintenance Battery Disposal and First Aid Corrective Maintenance The instrument contains the following number of batteries on the following boards m two batteries in the U500 and U511 RAM sockets on the A5 Time Base Controller board m one battery BT130 on the A14 I O board amp one battery BT150 on the A18 Memory board See Figures 6 10 6 19 and 6 22 respectively for the location of these batteries WARNING To avoid personal injury observe proper procedures for the han dling of lithium batteries Improper handling may cause fire explosion or severe burns Do not recharge crush disassemble heat the battery above 100 C 212 F incinerate or expose the contents to water Battery Disposal Dispose of the batteries according to local state and federal regulations NOTE Typically small quantities less than 20 can be safely disposed of with ordinary garbage in a sanitary landfill Larger quantities must be sent by surface transport to a hazardous waste disposal facility The batteries should be individually pack aged to prevent shorting Then pack them into a sturdy container that is clearly labeled Lithium Batteries DO NOT OPEN 11801B Service Manual 6 27 Corrective Maintenance Emergency and First Aid Information In case of accidental contact with the lithium b
224. sage will appear on the all P oscilloscope screen followed by a number that indicates which Acquisition Calibration Errors system the error was detected in Following this number there will be a string of eight four digit error codes that are used to identify possible faulty FRUs The following example shows the form that the error message will appear Error detected in acquisition system AA BBBB CCCC DDDD EEEE FFFF GGGG HHHH IIII where the A digits represent the number of the Acquisition system and the B C D E F G H and I digits represent the four digit error codes The B and I digits can be ignored If any of the C or D digits are non zero then the possible faulty FRUs from most to least likely are ACQMPU MFACQCON ACQANALOG TBC If any of the E F G or H digits are non zero then the possible fault FRUs from most to least likely are ACQANALOG ACQMPU MFACQCON 6 110 Maintenance Instrument Options 11801B Service Manual Options This section contains information on instrument and power cord options available for your 11801B digital oscilloscope Your instrument may be equipped with one or more options A brief descrip tion of each available option is given in the following discussion Option information is incorporated into the appropriate sections of the manual set Refer to the Table of Contents for the location of option information For further information and prices of instrument options
225. se Time lt 2 5 ns lt 2 5 ns Frequency 100 kHz 3 100 kHz x396 Duty Cycle 5096 3 5096 3 Calibrator Output yes Rise Time 250 ps 20 80 250 ps 20 80 Peak to peak Amplitude 250 mV x 1096 250 mV 410 TT A TE VERREM UTOR E RERBA AUR vr SST UNT UU Mh t E REV GAMBA HAMA ONU NHANH EE RR AA 4 2 Performance Verification Test Equipment Performance Verification Table 4 2 Test Equipment contains suggested test equipment for use in this section Procedure steps are based on the test equipment exampies given but you may substitute other equipment with similar specifications The use of different equipment may alter test results setup information and related connectors and adapters Table 4 2 Test Equipment Description Minimum Examples of Applicable Specification Test Equipment High Frequency 10 MHz to 10 GHz WILTRON 67588 Opt 2 Sine Wave Genera tor Sampling Head SD Series SD 24 and any other Tektronix SD Series Sampling Head except SD 14 Digital Voltmeter lt 0 005 Accuracy FLUKE 88424 Digital Voltmeter w test leads Frequency Counter One Part in Tektronix DC 5010 Universal 1 000 000 Accuracy Counter Timer with a TM 5000 Series Power Moduie Calibration Head Tektronix Calibration Head 067 1413 00 Precision Voltage DATA PRECISION 8200 Source Test Termina any GPIB IBM compatible PC with IEEE 1978 terminal emulation software controller or ASCH terminal equipped
226. see your Tektronix Products Catalog or contact your local Tektronix service center Option 1M adds connectors for SM 11 instrumentation providing up to 128 additional channels for a total of 136 acquisition channels Option 1R adds slide rails and rackmounting hardware to convert the benchtop instrument to a standard 19 inch rackmount version This option can be added at any time Option 1T adds the Predefined Telecommunications Mask firmware This option can be added at any time Option A1 replaces the standard power cord with the Universal Euro pean 220 V type power cord Option A2 replaces the standard power cord with the United Kingdom 240 V type power cord Option A3 replaces the standard power cord with the Australian 240 V type power cord Option A4 repiaces the standard power cord with the North American 250 V type power cord Option A5 replaces the standard power cord with the Switzerland 240 V type power cord Options A power cord with appropriate plug configuration is supplied with each Power Cord Information instrument Table 7 1 Power Cord Conductor Identification gives the color coding of the conductors in the power cord If you require a power cord other than the one supplied refer to Figure 7 1 Power Cord Piug Identifica tion Table 7 1 Power Cord Conductor identification Conductor Color Alternate Color Ungrounded Line Brown Black Grounded Neutral Light B
227. ss than 1 5 Q F800 supplies 5 V to the A10 Front Panel Control board and the A11 Front Panel board If the diagnostics report both an A9 Touch Panel board failure and knob failures then this fuse is one possible source of this problem When tested with an muitimeter this fuse should measure less than 1 C F600 supplies 15 V to the A14 I O board temperature sensor and tone generator the lights of the A11 Front Panel Button board the A9 Touch Panel board the A12 Rear Panel board s RS 232 C output line drivers the card cage and the A17 Executive Processor board s NVRAM If the NVRAM battery test and the RS 232 C External Loop Back test fail but the Internal Loop Back test passes and the A11 Front Panel Button board s lights temperature sensor and tone generator are all off then this fuse is the probable suspect When tested with an multimeter this fuse should measure less than 1 Q F602 supplies 15 V to the A14 I O board temperature sensor and tone generator A12 Rear Panel board s RS 232 C output line drivers the A9 Touch Pane board and the card cage If the temperature sensor tone generator and RS 232 C External Loop Back test fail but the Internal Loop Back test passes then this fuse is the probable suspect When tested with an multimeter this fuse should measure less than 1 Q The A14 I O board uses the 15 V and 15 V supplies on board to operate the temperature sensor and the tone generator Of the other card
228. stic Troubleshooting The DIAG query returns pass fail information from the most recent invoca tion of Self Test diagnostics or Extended Diagnostics Examples of possible responses and explanations are as follows DIAG PASSED NONE This response indicates that the Self Test diagnostics or Extended Diagnos tic operation did not detect any test faults DIAG FAILED E1311 E1711 E1721 E1731 This response indicates that the Extended Diagnostic operation detected test faults DIAG FAILED E1311 D1211 T1431 This response indicates that the Self Test diagnostics or Extended Diagnos tic operation detected test fauits DIAG BYPASSED This response indicates that a power on has occurred and that Self Test diagnostics were bypassed through a jumper on the A14 1 O board 6 88 Maintenance Battery Testing 118018 Service Manual Diagnostic Troubleshooting The oscilloscope holds four lithium batteries to provide power when the instrument is turned off The following discussions provide criteria for deter mining if a battery has exceeded its lifetime and is thus causing incorrect instrument operation A battery s lifetime will typically exceed five years If the battery voltage measures at 20 C equal to or greater than the voltages given then the circuit should operate correctly from 0 C to 50 C These voltage measurements are taken with the instrument power off Battery BT130 provides power for the real time cloc
229. stics Extended Diagnostics Vertical Accuracy system Vertical RMS Noise Power On Diagnostics Extended Diagnostics Power On Diagnostics Extended Diagnostics Display Power On Diagnostics Extended Diagnostics Power Supply Vertical Reference Voltage Vertical Accuracy System Vertical RMS Noise sweep Rate Accuracy Maintenance Diagnostics Overview 118018 Service Manual Diagnostic Troubleshooting This section provides the information necessary to troubleshoot a faulty oscilloscope to the field replaceable unit FRU level In most cases an FRU is a circuit board The primary means for troubleshooting is to use the error index code output from the Kernel diagnostics and cross reference them to the suspect circuit boards in the following tables or to use the built in FRU help function available in Extended Diagnostics In addition conventional troubleshooting techniques are described at the end of this section to help identify a faulty A4 Regulator board CRT Power Supply module A13 Mother board or AB CRT Driver board All subsystem processors Executive Display Time Base and Acquisition execute a set of Kernel diagnostics prior to the Self Test diagnostics After the Acquisition processor has verified its support circuitry it tries to establish communication with the Time Base processor After the Time Base proces sor has verified its critical support circuitry and after it has attempted to communicate with the
230. strument cover and set the instrument upright 6 72 Maintenance Corrective Maintenance C Step 9 Perform the final power on and verification as follows NOTE You must now perform the power on sequence again for the instru ment to recognize the new manufacturing jumper configuration m Set the PRINCIPAL POWER SWITCH and ON STANDBY switch to ON u Verify that the instrument powers on and successfully completes the Self Test diagnostics NOTE If problems are encountered then check for the following all components are properly oriented in the sockets w all component pins are properly seated amp components are installed in the correct location 11801B Service Manual 6 73 Corrective Maintenance Mutti Pin Connectors Cover End Tabs index Bevei Retaining Clip Index Spring Mating Recesses EE a ee ee Siam Pack IG EIER Index index Dual In L ne Package iC TEMERE Note Match the index triangle on the multi pin connectors with the corresponding square pad on the circuit board Figure 6 32 Multi Pin Connector Orientation and Semiconductor Indexing Diagram 6 74 Maintenance Corrective Maintenance Cables and A cabling diagram see Figure 9 2 is provided to show the interconnecting cables between the various circuit boards modules and assemblies Use Connectors this diagram as a reference when you are removing and or replacing cables between these uni
231. ta 3 27 Block Diagram Descriptions A D Convertors The output of each programmable gain amplifier is applied to an eight bit flash A D converter The converter compares its analog input to two refer ence voltages 1 V REF and 1 V REF and outputs an eight bit binary number that indicates the relative value of the analog input signal in relation to the reference voltages The digital output from the A D converters is stored in the shared RAM and made available for transfer to the Waveform Memory through the Time Base Controller Measurement Hardware This circuitry has the selected sampling head output from the input multi plexer applied to a precision strobed voltage comparator This voltage comparator compares the sampling head output voltage to a reference voltage generated by a 14 bit digital to analog converter DAC The comparator output is then filtered by a filter and transition counter circuit on the A25 A28 Acquisition MPU board to remove false transitions generated by noise and to count the transitions When the processor requests a hardware timing measurement such as a propagation delay measurement the comparator is programmed for the appropriate measurement level and the transition counter is programmed to locate the selected transition number and slope The hardware counts the strobe pulses that occur from the beginning of the acquisition to the point where the selected transition occurs This operation is performed
232. tem that is selected The I O block provides a GPIB port RS 232 C port and a PRINTER port for interfacing various O devices to the instrument The display subsystem provides all visual output to the user This includes not only data output such as waveform traces graticules axes and annota tion but displays supporting the human interface as well which includes menus labeling for touch panel input and an interactive output to assist in operating the system that is the current mode setting information The oscilloscope uses a custom vertical raster scan display that provides excellent resolution for both waveform display and text The display system produces a display by 1 transferring waveform data from the Waveform Memory 2 compressing it into 512 horizontal pixels 3 converting it to a format compatible with the vertical raster scan display The Waveform Compressor takes waveforms with more than 512 data points and compresses these points into 512 groups For example for a 1024 point waveform each group would contain two points for 2048 point waveforms each group would contain four points The Waveform Compressor finds the largest and smallest vertical value in a group of points and then draws a vector between the maximum and minimum even in dots mode The only difference between dots and vectors is that in vector mode the vectors are extended vertically to meet the vector on the next scan line System Functi
233. ter 20 ms If normal trigger mode is selected the 11801B will wait for trigger signals The High Frequency On Off Control selects the state of the trigger hysteresis in the trigger input path High Frequency On removes trigger hysteresis and improves sensitivity when the trigger signal edge slew rate is 1 V ns or greater typically a 320 MVp p 1 GHz sine wave See Figure 3 1 High Frequency Off retains trigger hysteresis while improving noise rejection at low frequencies when the trigger edge slew rate is less than 1 V ns It can be used at any frequency if the trigger signal amplitude reliably triggers the 11801B See Figure 3 1 This is the default setting after initialization 960 mV 2 1 Vins Vin DD 646 mV HF On 1 Vins HF Off iGHz 2 GHz 3 GHz 4GHz Frequency Figure 3 1 Trigger Edge Slew Rate for High Frequency Selection The Enhanced Triggering ON OFF Control selects the state of the metastable trigger rejection feature in the trigger input path Enhanced Triggering On directs the timebase to detect metastable trigger events and reject the acquired data The data is reacquired at the next trigger event Enhanced Triggering Off allows the timebase to acquire and display metastable trigger events The Trigger Holdoff Control in the trigger menu programs the trigger holdoff value Auto Holdoff is the defauit mode This mode automatically programs Actual Holdoff to the minimum possible value It
234. times appear as incomplete For further 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 5 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 they mount 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 Y1 1 10 2 Mechanical Parts List 11801B Service Manual Replaceable Parts Table 10 1 Board FRUs FRU Part Number Description A1 670 9365 05 M F Strobe Drive A2 620 0022 08 Power Supply Assembly A3 670 9640 00 M F Power Connect A4 6 0 9655 01 Reguiator A5 671 2931 00 Time Base Controlier Standard A5 671 2929 00 Time Base Controller w Option 1M A8 672 1372 01 CRT Driver A9 614 0916 0
235. tion and VERT POS R311 for optimum alignment Horizontal Size align with tic marks and none H SIZE R501 no Linearity and for optimum H LIN R502 and Position appearance H POS R500 for optimum alignment and linearity Gray Scale white at the top of the none SCHEEN on no display and gray at the transformer on A8 bottom and the right CHT Driver board side of the display is RED R200 cut off GREEN H201 and BLUE R203 for cutoff and color balance Color Impurity no severe color none cycle power on no impurities in red green and off and blue display Real Time Clock 1 000 000 us 5 us none Heal Time Clock no for 1 000 000 us Vertical Reference Voltage none 5 200 uV and none no 5 200 pV Horizontal Reference Clock none 200 000 KHz none no 5 kHz Vertical Accuracy Vertical Gain none 1 0 fuli scale none yes Offset Accuracy none 2 mV none yes Vertical Linearity none t1 none no System Vertical RMS Noise 200 uV at 2 mV div none none yes 500 uV at 5 mV div 1 mV at 10 mV div 632 uV at 20 mV div 1 58 mV at 500 mV div 3 16 mV at 100 mV div 6 32 mV at 200 mV div 1 2 Specifications Specifications Table 1 1 Measurement Limits Specifications Adjustments and Functional Tests Cont Part and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test oweep Rate Accuracy 0 0596 at 2 ns div none none yes 0 0896 at 1 ns div 0 8 at 100 ps div 2 596 at 10 ps div
236. to ON The oscilloscope performs power on diagnostics on its microprocessor subsystems and Self Test diagnostics on all of its major circuits When Kernel diagnostics begin the messages Diagnostics in Progress and Comm Test in Progress are displayed If the oscilloscope is being powered on from a cold condition then the diagnostics may complete before the CRT is warmed up and able to display these messages Diagnostic routines are performed in parallel on each of the instrument s processor subsystems Display Executive Time Base and Acquisition Following successful execution of their Kernel diagnostics the Acquisition processor attempts to communicate with the Time Base processor and the Time Base and Display processors attempt to communicate with the Execu tive processor The Executive processor will continue Seif Test diagnostics even if it is the only processor that has successfully completed its Kernel diagnostics In the case where the Display processor has not communicated successfully with the Executive processor the message indicating that Self Test diagnos tics are beginning will not appear on the screen Kernel diagnostic failures may be indicated by the message Dsy Kernel Failure or Comm Test in Progress on the screen and or a single high low beep and illuminated menu buttons If either the Display Time Base or Acquisition processors do not success fully pass their communications stage then the oscilloscope automatica
237. tor index triangles for correct replacement C Step 3 Remove the two Torx head screws from the A11 Front Panel Button board which is located at the top and near the inside center of the front casting L Step 4 Remove the A11 Front Panel Button board To replace the A11 Front Pane Button board perform the previous steps in reverse order Torx Head Screws 2 Hear View of the A11 Front Panel Button Board Figure 6 16 Removing Replacing the A11 Front Panel Button Board 6 44 Maintenance Corrective Maintenance A12 Rear Panel Assembly Removal and replacement steps are listed below See Figures 6 2 6 17 and 6 32 for connector screw and index locations Step 1 Remove the connectors from the RS 232 C the GPIB and the PRINTER connector holders Step 2 Remove the eight Torx head screws from the outer edges of the rear panel connector piate Step 3 Tilt the plate back from the instrument Remove connector J78 from the top of the A12 Rear Panel assembly Remove the grounding wire Note the position of the connector s index triangles to ensure that the connectors can be correctly replaced Step 4 Remove the rear panel connector plate and the attached A12 Rear Panel Assembly C Step 5 Remove the following items from the rear panel plate w two bail brackets screws and washers from the PRINTER connector m two posts from the GPIB connector m posts lockwashers and flat washers from the
238. transfers RAM ROM Memory Both RAM and ROM memory reside within the microprocessor s 1 Mbyte of address space The upper 256 Kbytes is reserved as ROM the lower 128 Kbytes of static RAM is provided for dynamic data storage and local nonvolatile memory There are 32 Kbytes of memory provided communica tion and waveform storage for the 11801B s eight channels and another 32 Kbytes for the Strobe Distribution block of the oscilloscope and multip lexers There are 512 Kbytes of memory assigned as communication and primary waveform storage Another 32 Kbytes are used to map the commu nication buffer of the parallel interface with the memory management unit and the remaining 32 Kbytes are divided into I O space and time base control Trigger This circuit is comprised of the trigger recognizer and gated voltage control oscillator The trigger circuits accept trigger signals from the trigger at tenuator The strobe sense signal and internal feedback signals are used in the Self Tests diagnostic process but are not normally used for data acquisition The trigger recognizer sees a valid direct trigger signal and outputs this signal to the voltage controlled oscillator which sets the timing for the strobe signal The direct trigger input allows programmed slope level AC DC and X1 X10 selection 11801B Service Manuali Block Diagram Descriptions if auto trigger mode is selected the timebase will generate its own trigger signal af
239. ts Interconnecting Pins Two methods of interconnection are used to electrically connect circuit boards with other boards and components When the interconnection is made with a coaxial cable a special end lead connector plugs into a socket on the board Other interconnections are made with a pin soldered into the board Two types of connectors are used for these interconnecting p ns If the connector is mounted on a plug on board a special socket is soldered into the board If the connector is on the end of a lead an end lead pin connec tor is used which mates with the interconnecting pin The following informa tion provides the removal and replacement procedure for the various types of interconnecting methods Coaxial type End Lead Connectors Peltolas amp SMB These connectors use color coding of wires which may be heipful to corre late a Peltola connector to its socket on a circuit board The wire insulation s color or its colored stripe is the same as the color represented by the last digit of the JXX component number EXAMPLE a green wire would connect to a J05 socket Other Peltola connectors may have labels which designate their JXX component number Multi Pin Connectors These connectors are arranged so that the pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the associ ated leads Some of the pin connectors are grouped together and mounted in a plastic holder The ov
240. u 000 ee eee touch Stored T in pop up menu 65yesa cer ey S cdaendeceeen ss touch Enter STO1 mean value Use pop up key pad to enter STO1 mean value recorded written down in Step 8 NOTE For example if mean value is 50 2 HV you would Key in 50 2 EEX 6 STO already appears on upper left of display Exponents are entered by pressing the EEX key followed by the sign of the exponent if negalive followed by the exponent value Enter Desc in pop up menu seeeeeeeeeeeee ee eee touch 4 32 Performance Verification Performance Tests L Step 10 Measure the RMS value as follows MEASURE Button 2262032 rto aep eei e oe detentions press Measurements in major menu 02 6 eee touch RMS rn pop up menu iade ek e aea RECORDER e touch Check that RMS is lt 200 uV Exit Menu to exit cca dete icnt oiabiGds PAP OR REESE touch 7 Step 11 Erase the test traces as follows STOREIREGCALE buton uu tua ERIS EM RERESER EH ENSE Dress Delete Trace in major menu sseesseeeeeess touch All Traces in pop up menu eeeeeeeeeeeeeee hen eee touch Delete Selected Traces in pop up menu touch C Step 12 Repeat Steps 4 through 11 at the sensitivities listed in Table 4 5 and check the resulting RMS against the matching specifica tion value in the table Table 4 5 Sensitivity Settings Sensitivity Specification 5 mV div 500 uv 10 mV div 1 mV 20 mV div 63
241. ual 6 41 Corrective Maintenance A10 Front Panel Control Board Removal and replacement steps are listed below See Figures 6 5 6 11 6 15 and 6 32 for connector screw and index locations 7 Step 1 Remove the CRT shield Refer to the Cathode Ray Tube Re mova procedure in this section starting at Step 3 7 Step 2 Remove connectors J72 J73 J74 and J75 from the A10 Front Panel Button board Note the position of the multi pin connector s index triangles to ensure that the connectors can be correctly replaced 7 Step 3 Remove the two Torx head screws at the upper edge of the board 7 Step 4 Lift the board away from the guides at its bottom and remove it To replace the A10 Front Panel Control board perform the prev ous steps in reverse order 6 42 Maintenance Corrective Maintenance Torx Head Screws 2 Support Bracket J72 J74 J73 J75 Figure 6 15 Removing Replacing the A10 Front Panel Control Board 11801B Service Manual 6 43 Corrective Maintenance A11 Front Panel Button Board Removal and replacement steps are listed below See Figures 6 5 6 11 6 15 6 16 and 6 32 for connector screw and index locations _ Step 1 Remove the CRT shield Refer to the removal instructions in the Cathode Ray Tube Removal Replacement procedure earlier in this section starting at Step 3 C Step 2 Remove connector J75 from the A10 Front Panel Control board Note the position of connec
242. uch Identity hannel D seep te eee beets abe touch Select Enter Desc 0 0 0 ccc eee eee touch 11801B Service Manual 4 31 Performance Tests L Step 5 Set the mainframe Vert Offset as follows Mert SIZe ICOD sator edita eb d a AE ER touch Set Vert Size M1 to 2 mV div L u adjust upper knob 7 Step 6 Set the record length as follows Horizontal Desc in major menu esee touch Main Record Length in pop up menu 0 205 touch Set Main Record Len to 5120 points adiust upper knob C Step 7 Store the trace as follows STORE RECALL DUTON iur Pra do oca iet RH RERO press Store Trace in major menu 0 eanna touch Trace 1 in pop up menu ueeeeeeeeee ees touch Note that you must touch Trace 1 even though it is highlighted in the menu Recall Trace in major menu 0 02002 008 touch STO 1 in pobD Hp meni vc sacs eei ao esisi is RE tear touch C Step 8 Measure the Mean value as follows MEASURE DUEIOH xc uan done Xue Uc Roda t m Dx RR ney press Measurements in major menu eeeeeeeeeeeeen eis touch Mean in pop up menu ssssee le en touch Exit Menu in pop up menu seeeeeeee ee ee ee ee touch NOTE Record write down the mean value for use in the next step Step 9 Define the trace to be stored as follows Der WA ICON erra at up ws or dist i UR VR ab iere Aga touch Stored Traces in pop up men
243. ure 9 10 for a block diagram of this board MMU IC This circuit controls all data transfers to and from waveform RAM The MMU gate array controis high speed transfers of waveform data and communica tion messages between waveform RAM and the three subsystem interfaces the Display Time Base Controller and Executive processors A set of hand shaking lines designed to the DMA facilities of each particular subsystem coordinates each subsystem interface Wavetorm RAM This memory consists of 512 Kbytes of RAM The RAM holds waveform data and messages that are read and written by the Time Base Controller Dis play and Executive subsystems Display Interface Data is transferred to and from the Display subsystem and to and from the MMU IC through the Display Interface The data is buffered with the bidirec tional display data buffers 3 20 Theory of Operation 11801B Service Manual Block Diagram Descriptions Time Base Controller Interface Data is transferred to and from the Time Base Controller subsystem and to and from the MMU IC through this interface Executive Processor EXP Interface This circuit consists of bidirectional buffers address mapping programmable array logic PAL and interface timing control PALs This circuitry directs data flow to the EXP from the MMU IC and vice versa Display IC This component consists of the following functional circuits m CRT controller w Video output circuitry m Compress
244. uring power up diagnostics The values are written at the factory with the GPIB command CALCORRECTION CALCORRECTION ui N where ui 0 32andN 128 127 The calibration enhancement values are set at time of manufacture There is no query form of this command Do NOT reset these values If a 11331 failure occurs during extended power up diag nostics or you suspect a time interpolator error contact Tektronix factory service A T1331 failure causes all N values in the 33 ui locations to be reset to zero The oscilloscope will still run but with decreased accuracy in the time inter polator linearity Resetting NVRAM with the Teksecure feature does not affect the Time Base Controlier board NVRAM 6 108 Maintenance 11801B Service Manual Other Troubleshooting Table 6 18 Time Base Calibration Errors Error Message Error Code Suspect FRU Minor time base calibration problem 12 TBC 14 TBC 16 TBC 18 TBC 24 TBC 33 TBC Time base calibration failed 101 201 TBC at power on 102 202 TBC 103 203 TBC 111 211 TBC 113 213 TBC 115 215 TBC 117 217 TBC 121 221 TBC 122 222 TBC 123 223 TBC 125 225 TBC 126 226 TBC 131 231 TBC STROBEBUF STROBEDR 132 232 TBC 134 234 TBC 135 235 TBC STROBEBUF STROBEDR 136 236 TBC 137 237 TBC 138 238 TBC STROBEBUF STROBEDR or Sampling Head 6 109 Other Troubleshooting Acquisition When acquisition calibration errors occur a mes
245. using Connect A4 Regulator M F man Drive Figure 6 1 Field Replaceable Units FRU Locator f 6 14 Maintenance Corrective Maintenance A24 Acquisition Analog Board A25 A28 Acquisition dai Meu MPU Board oar A21 A20 A23 a M Acquisition Head Interconnect Ps Analog Board Boards A19 StrobelTDR Buffer Board A26 M F Acquisition interconnect Board Figure 6 1 Field Replaceable Unit FRU Locator Cont 11801B Service Manual 6 15 Corrective Maintenance The Power Supply module slides out of the rear of the oscilloscope for ower supply Module Removal maintenance and troubleshooting It may also be removed to gain better access to the A3 M F Power Connect board or the A4 Regulator board Replacement see Figure 6 2 and Figure 6 3 for connector and screw locations Power Supply Rear plaie Screws 4 Fan housing Screws 4 E CAUTION CAUTION fR Qu are duc TO r tv dsi ILLLIMCAL araca a PUbGomALG sath My ir wi TON m DO xoi oct hb AZR FO dikena F rp amp SONTOR P doke Fe TMETIDA fadt C IOCA H ZANO FIPLECE Cony woth 34 JION FLAT ach ERAAN My ii hooho M ME IRUMFEMT REF te as4 t1 F isc PRINCIPAL UNE WOLTADE T wTRn PITCH ie oon Line Fuse F99 t FA RON Power Supply Rear plate Screws 4 Rear Panel Connector plate Screws 4 agong 4OCE Rear Panel Connector plate Screws 4 Figure 6 2 Removing the Power Suppiy Module
246. v 39 0 mV 41 0 mV 20 mV div 78 mV 82 mV 50 mV div 195 mV 205 mV 100 mV div 390 mV 410 mV 200 mV div 780 mV 820 mV eM NT BER sc emer rrr HAA Snr irvA Siri AA 11801B Service Manual 4 9 Performance Verification 11801B Test Record Cont Performance Test Minimum Incoming Outgoing Maximum Vertical Offset Accuracy Fourth Compartment 2 Step 10 400 mV 398 mV 402 mV Step 11 1V 0 998 V 1 002 V 2V 1 998 V 2 002 V 400 mV 402 mV 398 mV 1V 1 002 V 0 998 V 2 V 2 002 V 1 998 V Sweep Rate Accuracy ns Sweep Rate Accuracy Step 10 2 ns div 3 0 0596 18 172 ns 18 192 ns Step 14 1 ns div 0 0896 9 083 ns 9 098 ns ps Sweep Rate Accuracy Step 18 100 ps div 0 896 902 ps 916 ps Step 28 10 ps div 1 2 596 248 1 ps 260 5 ps Step 40 1 ps div 1096 23 1 ps 28 3 ps Internal Clock Step 6 Rise Time 2 5 ns step 8 Frequency 97 kHz 103 kHz Duty Cycle 4796 5396 Calibrator Output Step 6 Rise Time 250 ps Amplitude 225 mV 275 mV 4 10 Performance Verification Performance Verification Using These Some procedures begin with a setup illustration that shows what test equip Procedures ment is needed and how to connect it The other procedures require only a calibrated SD Series Sampling Head Refer to Table 4 2 Test Equipment on the preceding pages for an example of the test equipment for each procedure Conventions in this Manual in these procedures
247. vary from 10 fs to 20 ns depending on the horizontal size and the number of points in the waveform record The sampling interval incremental delay between sampies is the total acquisition time time division x 10 divisions divided by the number of points acquired Acquisition System Interface This circuit contains 16 Kbytes of RAM physically located on the A25 A28 Acquisition MPU board that is shared between the Acquisition system and the Time Base Controlier This RAM is mapped into the microprocessor memory space so that it can be accessed as any other RAM either by the microprocessor itself or by the DMA controller This shared memory allows the microprocessor to transfer waveforms from the Acquisition system to the Waveform Memory using DMA It also provides a mailbox structure for commands and data passed between the two systems 11801B Service Manual 3 11 Block Diagram Descriptions A7 CRT Socket Board 3 12 Memory Management MMU Interface This circuit interfaces the Time Base Controller to the EXP and the Waveform Memory This interface allows the EXP to send commands to the micropro cessor through the Time Base Controller and provides the path for waveform transfers from the Acquisition system to the Waveform Memory The A7 CRT Socket board is an interface from the A15 MMU board to the CRT The A7 CRT Socket board consists of the following circuits a Red Green and Blue video amplifiers a RED GRE
248. viding the following information pass An automatic test has executed and did not fail YXXXX A test has failed and the failure encountered in subsys tem Y is xxxx This index code contains one digit each for Subsystem identification Block identification Area identification Routine identification and a Test identifier that gives some specific information about the failure ae An automatic test has not yet been executed When the test does execute the test will provide either pass or Yxxxx failure status The test requires you to perform some type of test set up using the RS 232 C loopback connector When executed this status provides pass or Yxxxx failure status To execute this test you must select it 6 84 Maintenance Diagnostic Troubleshooting blank This status indicates that the test requires action from the user such as the front panel verification tests or that the test is for stimulus only such as the manual calibration tests This status does not provide failure status To execute this test select it individually 19979 This status indicates that an option was found that was not present in the current instrument configuration or that a subsystem was found that did not have a working communication path amp Failure Count field indicates the total number of routine failures one per routine currently encountered in the Subsystem Block or Area Thus the Failure Count will neve

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