Tektronix 7B80, Instruction Manual

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Page 4: ... THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID ELECTRICAL SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CALLED OUT IN THE OPERATING IN STRUCTIONS UNLESS QUALIFIED TO DO SO 7B80 Instruction PAGE Trigger Slope 1 7 Trigger Level 1 7 Horizontal Sweep Rates 1 7 Time Measurement 1 7 Sweep Magnification 1 7 Variable Hold Off 1 7 Mainframe Operating Modes 1 9 APPLICATI...

Page 5: ...ESHOOTING EQUIPMENT 4 5 TROUBLESHOOTING TECHNIQUES 4 6 CORRECTIVE MAINTENANCE 4 9 OBTAINING REPLACEMENT PARTS 4 9 TABLE OF CONTENTS CONT PAGE SECTION 6 REPLACEABLE ELECTRICAL PARTS SECTION 7 INSTRUMENT OPTIONS SECTION 8 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS SECTION 9 REPLACEABLE MECHANICAL PARTS CHANGE INFORMATION PAGE SOLDERING TECHNIQUES 4 9 COMPONENT REMOVAL AND REPLACEMENT 4 10 Circuit Boar...

Page 6: ...16 The illustrations in Section 8 are located near their associat ed Diagrams on the foldout pages Basic block diagram of the 71380 8 1 Semiconductor lead configurations Time Base Unit 3 2 8 2 Location of circuit boards in the 7880 Detailed block diagram of Trigger 8 3 A1 Interface circuit board assembly Generator 3 6 8 4 A2 Trigger circuit board assembly Functional diagram of Trigger Source 8 5 A...

Page 7: ...O PAGE 2 1 Electrical Characteristics 2 1 3 2 Readout Character Selection 3 15 2 2 Environmental Characteristics 2 3 5 1 Test Equipment 5 2 2 3 Physical Characteristics 2 3 5 2 Sweep Timing 5 10 3 1 Basic Logic Reference 3 3 5 3 Magnified Sweep Timing 5 11 ...

Page 8: ... hazards are present in this instrument The protective instrument covers must not be removed by operating personnel Component replacement and internal adjustments must be referred to qualified service personnel Do Not Service or Adjust Alone Do not service or make internal adjustments to this instrument unless another person capable ofgiving first aid and resusci tation is present Warning Statemen...

Page 9: ...y a factor of 10 and a VARI ABLE TIME DIV control provides continuously variable sweep rates between calibrated steps Variable hold off and alpha numeric readout are provided Also when operating in the AUTO TRIGGERING MODE a bright baseline trace is displayed in the absence of a trigger signal The 71380 can be operated as an independent time base or as a delayed sweep unit with a com panion delayi...

Page 10: ...HOLD OFF MIN fully counter sweep calibration of the unit should be checked when in clockwise stalled The procedure for checking the unit is given under MAG X1 pushed in Sweep Functions in the Functional Check procedure in this section To remove the unit pull the release latch see Figure 1 1 to disengage the unit from the mainframe and pull it out of the plug in compartment CONTROLS CONNECTORS AND ...

Page 11: ...Fig 1 2 Front panel controls connectors and indicators ...

Page 12: ...al positioning SWEEP MAG Pushbutton Selects magnified X10 or unmagnified sweep TIME DIV Selector Selects the sweep rate of the sweep generator EXTERNAL TRIGGER INPUT EXT TRIG ATTENUATOR Selects attenuation factor for external trigger signals EXT TRIG IN Connector Connector BNC type provides input for external trigger signals Fig 1 2 Front panel controls connectors and indicators coat Operating Ins...

Page 13: ... demonstrate the function of the related controls 1 Obtain a one cycle per division display as described in the preceding Normal Sweep procedure 2 Press to release the MAG button X10 Note that the unmagnified display within the center division of the grati cule is magnified to about 10 divisions 3 Press the MAG button X1 Triggering Functions Perform the following procedure to obtain a triggered sw...

Page 14: ...to peak amplitude of the trigger signal The LEVEL control can be set so that the displayed waveform starts at any point within this range on either slope The trigger circuits automatically compensate for a change in trigger signal amplitude Therefore if the LEVEL control is set to start the waveform display at a certain per centage point on the leading edge of a low amplitude signal it triggers at...

Page 15: ...al which triggers the sweep AC AC COUPLING blocks the do component of the trig ger signal Signals with low frequency components below about 30 hertz are attenuated In general AC COUPLING can be used for most applications However if the signal contains unwanted frequency components or if the sweep is to be triggered at a low repetition rate or do level one of the other COUPLING switch positions wil...

Page 16: ...e TIME DIV switch provides calibrated sweep rates from 5 seconds division to 10 nanoseconds division in a 1 2 5 Time Measurement Operating Instructions 71380 sequence The VARIABLE TIME DIV control must be in the calibrated position and the MAG switch set to X1 to obtain the sweep rate indicated by the TIME DIV switch However the mainframe crt readout will display the appro priate sweep rate The VA...

Page 17: ...Fig 1 3 Effect of LEVEL control and SLOPE switch on crt display ...

Page 18: ...inframe or as a delayed sweep unit in those mainframes that have two horizontal compartments Acompanion delaying time base unit is required for delayed sweep operation Refer to the delaying time base unit in struction manual for additional information Fig 1 4 Area of graticule used for most accurate time measure ments Fig 1 5 Operation of sweep magnifier ...

Page 19: ...partment either A or B horizontal in a four compart ment mainframe 2 Connect the signal to be measured to the vertical unit input 3 Set the mainframe horizontal and vertical mode switch es to display the time base and vertical units Check that the time base VARIABLE CAL IN control is pushed in and the HOLD OFF control is in the MIN position 4 Set the TRIGGERING switches and LEVEL control for a sta...

Page 20: ...display with an exact number of divisions of amplitude 6 Set the TIME DIV switch and POSITION control to dis play the rising or falling portion of the waveform within the center 8 graticule divisions as shown in Figure 1 7 see General Operating Information in this section for discussion of timing measurement accuracy 7 Determine rise time or fall time by measuring the hori zontal distance in divis...

Page 21: ...tch and POSITION control for 1 complete pulse displayed within the center 8 graticule divi sions as shown in Figure 1 8 7 Measure the horizontal distance in divisions between the 50 amplitude points of the displayed pulse see Figure 1 8 1 1 2 8 Multiply the horizonal distance measured in step 7 by the TIME DIV switch setting Divide the answer by 10 if sweep magnification is used Example Assume tha...

Page 22: ...00 or 7900 Series With SWP CAL adjusted at 1 ms div within the temperature Mainframes range of 20 to 30 C to a timing reference of 0 25 or better Over Center 8 Div 15 to 35 C 0 to 50 C Unmag Mag Unmag Mag 5 s Div to 1 s Div 4 0 5 0 5 0 6 0 0 5 s Div to 0 1 its Div 1 5 2 5 2 5 3 5 50 ns Div to 10 ns Div 2 5 4 0 3 5 5 0 Excluded Portions of Sweep Start of Sweep First 10 ns in 7800 7900 series mainfr...

Page 23: ...Signal Required The triggering frequency ranges given here are limited to the 3 dB frequency of the oscilloscope vertical system mainframe and amplifier unit when operating from an internal source 3 Will not trigger on sine waves at or below 60 Hz when amplitudes are less than 8 divisions internal or 3 volts external The Triggering Frequency Range for DC COUPLING applies to frequencies above 30 Hz...

Page 24: ...s Approximately 2 1 pounds 1 kilogram See Figure 2 1 dimensional drawing Specification 7880 aoo ooa nao Do 0 O 00 5 0 12 7 NOTE TOP FIGURES IN INCHES LOWER FIGURES IN CENTIMETERS OVERALL DIMENSIONS MEASURED AT MAXIMUM POINTS 12 5 1 2 1 3 0 31 7 2 2 14 5 36 9 8 1958 5 Fig 2 1 7B80 dimensional drawing STANDARD ACCESSORIES 1 ea Operators Manual 1 ea Instruction Manual ...

Page 25: ...a basic reference for the logic devices used within this instrument Any deviations from the standard symbol ogy or devices not defined by the standard are described in the circuit description for the applicable device THEORY OF OPERATION BLOCK DIAGRAM DESCRIPTION DETAILED CIRCUIT DESCRIPTION Section 3 71380 rate of change slope of the sawtooth signal is determined by the TIME DIV switch setting Th...

Page 26: ...e For examples of input output tables for individual devices see Table 3 1 NON DIGITAL DEVICES Not all of the integrated circuits in this instrument are digi tal logic devices The function of nondigital devices is de scribed individually using operating waveforms or other techniques to illustrate the function EXT TRIG IN LEVEL HOLDOFF SOURCE TIME DIV ROW COLUMN DATA TIME DIV1 READOUTJ SIGNAL SWEEP...

Page 27: ...tate A device with two or more inputs and one output The output of the NOR gate is LO if one or more of the inputs are at the HI state A device with one input and one output The output state is always opposite to the input state X X D X X TABLE 3 1 Basic Logic Reference Theory of Operation 71380 Input Output Table Input output Input Output Input Output Input Output A B X LO LO LO LO HI LO HI LO LO...

Page 28: ... usually the trigger input of a flip top re sponds to the indicated transition of the applied signal A bistable device with one input and two outputs either or both outputs may be used When trig gered the outputs change from one stable state to the other stable state with each trigger The outputs are complementary i e when one out put is HI the other is LO The dynamic indicator on the trigger T in...

Page 29: ... the other is LO The dynamic indi cator on the clock input may be of either polarity depending upon the device For devices with set S or reset R inputs the indicated state at either of these inputs overrides all other inputs to the states shown in the Input Output Table Device Symbol Triggered Set Clear J K Flip Flop D data Type Flip Flop with Direct Inputs Direct Inputs may be applied to all trig...

Page 30: ...Fig 3 2 Detailed block diagram of Trigger Generator ...

Page 31: ...f Operation 71380 A sample of the line voltage is connected to the trigger cir cuits via interface connector pin A4 The line signal is connected to the Trigger Source Selector and Amplifier stage at U65 pin 2 Trigger Source Selector and Amplifier The Trigger Source Selector and Amplifier stage partial U65 determines whether the triggering signal source is from the signal being displayed INT a sign...

Page 32: ...ished by R51 determines the current reference that sets the Automatic Gain Control threshold Fig 3 3 Functional diagram of Trigger Source Selector Slope Selector and Trigger Generator Integrated circuit U85 converts the differential trigger sig nal from the Trigger Source Selector and Amplifier block to a differential gate waveform for use by the Gate Generator stage SLOPE switch S60 is connected ...

Page 33: ...2 Q96 098 LOGIC O3 Theory of Operation 71380 In the absense of a trigger output at U85 pins 13 and 14 pin 3 is set LO and pin 4 is set HI The LO level from U85 pin 3 is coupled through J200 2 to the Logic circuit dia gram 3 to indicate the lack of a triggering signal The Logic circuit provides a LO level auto sense pulse through J200 3 to the base of Q98 This LO level gates the comparator Q98 and ...

Page 34: ...e sweep is ready to accept a trigger 3 10 Fig 3 5 Detailed block diagram of Logic circuit After completion of one sweep the hold off start pulse at U220 pin 16 causes the sweep disable out at pin 17 to rise HI A HI level at U220 pin 12 initiates single sweep opera tion and holds the sweep disable out at U220 pin 17 HI after completion of the sweep Momentary contact of the RESET push button places ...

Page 35: ... 4O Theory of Operation 71380 Timing Resistors and flows through the collector of Q732 to the Ramp Generator stages Ramp Generator The Ramp Generator stages produce a linear positive going ramp for the Output Preamplifier and Sweep Gate Genera tor stages Refer to Figure 3 6 Upon the arrival of a HI level sweep start gate at the Cur rent Switch stage Q322 turns on and Q324 turns off The source curr...

Page 36: ...Fig 3 6 Detailed block diagram of Sweep Generator ...

Page 37: ...Fig 3 6 Detailed block diagram of Sweep Generator cont ...

Page 38: ...t LO is coupled through emitter follower Q382 to the mainframe for sweep blanking TIME DIVISION READOUT O5 The Readout circuits provide information to the mainframe readout system Readout circuitry is shown on the Time Division Readout diagram 5 at the rear of this manual Basic Readout System The readout system in 7000 series mainframes provides alpha numeric display of information encoded by the ...

Page 39: ...52 number of zeros displayed or 13756 prefix change information Uncalibrated TS 3 Indicates calibrated or uncali 13761 13764 brated sweep rates and delay times 1 2 5 TS 4 Scaling TIME DIV 13771 13772 13773 m p n TS 8 Defines the prefix which modifies 13781 13782 the units of measurement 13783 13784 s seconds TS 9 Defines the unit of measurement I R793 13794 ...

Page 40: ...to blow off the accumulated dust with dry low pressure air 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 MAINTENANCE PREVENTIVE MAINTENANCE Switch Contacts Switch contacts and pads are designed to operate dry for the life of the switch However as the switches are not se...

Page 41: ...hecking semiconductor operation are given under Troubleshooting ADJUSTMENT AFTER REPAIR After any electrical component has been replaced the ad justment of that particular circuit should be checked as well as the adjustment of other closely related circuits The Performance Check and Adjustment procedure in this manual provides a quick and convenient means of checking instrument operation In some c...

Page 42: ...diagrams indicate the posi tion of each cam in the complete switch assembly The switch cams are numbered from front to rear Diode Color Code The cathode end of each glass encased diode is indicated by a stripe a series of stripes or a dot The cathode and anode ends of metal encased diodes are identified by the diode symbol marked on the case For most silicon or germanium diodes with a series of st...

Page 43: ...Fig 4 2 Semiconductor lead configuration ...

Page 44: ...ment operation In some cases minor troubles may be revealed or corrected by adjustment TROUBLESHOOTING EQUIPMENT The following equipment in addition to that listed in the Performance Check and Adjustment section is useful for troubleshooting Transistor Tester Description Dynamic type tester Purpose Test semiconductors Fig 4 5 Location of pin numbers on Interface connector Fig 4 4 End lead multi pi...

Page 45: ...nstrument in which the trouble is located Many troubles can be located by visible indications such as unsoldered connections broken wires damaged circuit boards damaged components etc 4 CHECK INSTRUMENT ADJUSTMENT Check the ad justment of this instrument or the affected circuit if the trouble appears in one circuit The apparent trouble may be the result of misadjustment Complete adjustment instruc...

Page 46: ...t of the diagrams section Do not use an ohmmeter scale that has a high internal current High currents may damage the diode Maintenance 71380 Diodes A diode can be checked for an open or shorted con dition by measuring the resistance between terminals with an ohmmeter scale having a low internal source current such as the R X 1 K scale The resistance should be very high in one direction and very lo...

Page 47: ...Fig 4 6 71380 troubleshooting chart ...

Page 48: ...nd accuracy of this instrument can be main tained only if proper soldering techniques are used when re pairing or replacing parts General soldering techniques which apply to maintenance of any precision electronic equipment should be used when working on this instru ment Use only 60 40 rosin core electronic grade solder The choice of soldering iron is determined by the repair to be made When solde...

Page 49: ... excess lead protruding through the board if not clipped in step 3 6 Clean the area around the solder connection with a flux removing solvent Be careful not to remove information printed on the board COMPONENT REMOVAL AND REPLACEMENT 4 1 0 WARNING To avoid electrical shock disconnect the instru ment from the powersource before replacing components The exploded view drawing associated with the Repl...

Page 50: ... REMOVAL Fig 4 7 Readout board removal procedure 4 Note color of multi pin connectors see Figure 4 4 for 7 Remove Interface circuit board through rear of identification and P numbers to which each connect Dis instrument connect all multi pin connectors from board To install the Interface circuit board 5 Remove 4 screws that secure gray plastic rear panel to instrument frame 1 Guide TIME DIV switch...

Page 51: ... or replacement however it is recommended that the switch be removed and replaced as a unit Refer to Figure 4 9 for special instructions on cam switch removal Repair of a cam switch should be undertaken only by experienced maintenance personnel Switch alignment and contactspacing must be carefully maintained for proper operation A cam switch repair kit is available Tektronix part 040 0541 00 which...

Page 52: ...able Mechanical Parts list An alternative solution is to refer the replacement of the defective connector to your local Tektronix Field Office or representative CIRCUIT BOARD PINS Maintenance 71380 END LEAD PIN CONNECTORS The pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the associated leads To remove and replace damaged end lead pin connectors rem...

Page 53: ...Fig 4 9 Cam switch removal procedure ...

Page 54: ...Fig 4 10 Removal procedure for typical push button switch ...

Page 55: ...wires to the socket cap as noted previously In stall the cap in the sleeve Incandescent lamps are used to illuminate the transparent push button switches To replace incandescent lamps un solder the lead wires from the rear of the cap see Figure 4 12 pull the cap and bulb out of the sleeve Solder the replacement lamp and lead wires to the cap Install the assembly in the sub panel sleeve ADJUSTMENT ...

Page 56: ...ent pro cedure make each adjustment to the exact setting indicated Section 5 71380 PARTIAL PROCEDURES The following procedure is written to completely check and adjust the instrument to the Performance Requirements listed in Section 2 Specifi cation If the applications for which the instrument is used do not require the full available performance the procedures and the required equipment list can ...

Page 57: ...cks and a Tektronix TG 501 Time Mark accuracy within 0 1 adjustments Generator with power module b Tektronix 2901 Time Mark Generator c Tektronix 184 Time Mark Generator 5 Low Frequency Sine Frequency 30 Hz to 50 kHz Low frequency triggering a Tektronix FG 503 Function Wave Generator output amplitude variable checks and adjustments Generator with power module from 50 mV to 3 V into 50 92 b General...

Page 58: ... see introductory information Performance Check and Adjustment 71380 PRELIMINARY PROCEDURE 1 Install an amplifier unit in the left vertical compartment of the oscilloscope mainframe 2 Install the 067 0589 00 plug in extender in the B hori zontal compartment of the mainframe Remove the side covers and install the 71380 in the plug in extender 3 Set the mainframe vertical mode switch to display the ...

Page 59: ...gh frequency signal generator 5 Plug in extender 6 50 ohm cables 2 7 BNC T connector TEST POINT AND ADJUSTMENT LOCATIONS in the Diagrams section f ADJUST 1385 DC Balance for a stable crt display g Set the SLOPE switch to and check for a stable display h ADJUST 1380 Slope Balance for a stable display i Check for a stable display when the SLOPE switch is set to and j INTERACTION Repeat the adjustmen...

Page 60: ... Requirement check see introductory information Performance Check and Adjustment 71380 c Set the amplifier unit deflection factor for 0 5 volts division Set the low frequency sine wave generator for a 6 division display 3 volts at 1 kilohertz d CHECK That all levels of the positive slope may be selected for the sweep starting point as the TRIGGER ING LEVEL control is rotated throughout its range i...

Page 61: ...quency signal generator for a 7 5 division display 375 millivolts at 400 megahertz Set the TIME DIV switch to 10 ns and the MAG switch to X10 Performance Requirement check see introductory information 5 6 N t CHECK Set the TRIGGERING MODE to P P AUTO and check for a stable display TRIG D light on when the LEVEL control setting is within the ends of the arrows on the front panel Repeat for both the...

Page 62: ...EVEL control TRIG D light on with COUPLING set to 1 AC 2 DC Performance Requirement check see introductory information REV A NOV 1976 Performance Check and Adjustment 71380 t CHECK Set the SLOPE to and repeat part s u Set the high frequency signal generator and the amplifier unit deflection factor for a 1 5 division display at 400 megahertz Set the TIME DIV switch to 10 ns and the MAG switch to X1...

Page 63: ...nce Requirement check see introductory information B HORIZONTAL SYSTEM Equipment Required 1 Oscilloscope mainframe 2 Amplifier plug in unit 3 Time mark generator 4 Plug in extender 5 50 ohm cables 2 6 50 ohm termination TEST POINT AND ADJUSTMENT LOCATIONS in the Diagrams section B2 CHECK SWEEP LENGTH AND POSITIONING RANGE a Horizontally position the display to place the second time marker to the f...

Page 64: ...the HOLD OFF control counterclockwise to MIN and set the LEVEL control for a stable display Performance Requirement check see introductory section B6 CHECK SWEEP TIMING Performance Check and Adjustment 71380 B5 ADJUST SWEEP TIMING C330 13710 13715 a Set the TIME DIV switch to 50 ns and set the time mark generator for 50 nanosecond markers b Check for 1 marker division over the center 8 divi sions ...

Page 65: ...lerances a Center the display horizontally on the graticule Set the MAG switch to X10 and the SOURCE switch to EXT b Connect the time mark generator trigger output to the EXT TRIG IN connector with a 50 ohm cable and 50 ohm termination Performance Requirement check see introductory section TABLE 5 2 Sweep Timing TIME DIV Time Markers Tolerance 15 to 35 C 10 ns 10 ns Within 0 2 div 20 ns 20 ns With...

Page 66: ...ut procedure in the Operating Instructions or calibration sections of the instruction manual for the delaying sweep unit This completes the Performance Check and Adjustment procedure TIME DIV Time Markers Tolerance 15 to 35 C 10 ns 2 ns 1 Within 0 32 div 20 ns 2 ns Within 0 32 div 50 ns 5 ns Within 0 32 div 1 ps 10 ns Within 0 2 div 2 ps 20 ns Within 0 2 div 5 As 50 ns Within 0 2 div 1 As 1 As Wit...

Page 67: ...act you concerning anychange in part number Change information if any is located at the rear of this manual SPECIAL NOTES AND SYMBOLS X000 Part first added at this serial number 00X Part removed after this serial number ITEM NAME In the Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item ...

Page 68: ...293 INTERSIL INC 10900 N TANTAU AVE CUPERTINO CA 95014 32997 BOURNS INC TRIMPOT PRODUCTS DIV 1200 COLUMBIA AVE RIVERSIDE CA 92507 50434 HEWLETT PACKARD COMPANY 640 PAGE MILL ROAD PAID ALTO CA 94304 53184 XCITON CORPORATION 5 HEMLOCK STREET LATHAM NY 12110 56289 SPRAGUE ELECTRIC CO NORTH ADAMS MA 01247 71590 CENTRALAB ELECTRONICS DIV OF GLOBE UNION INC P 0 BOX 858 FORT DODGE IA 50501 72136 ELECTRO ...

Page 69: ...52 283 0111 00 CAP FXD CER DI O IUF 20 50V 72982 8121 NO88Z5U104M C53 281 0773 00 CAP FXD CER DI O O1UF 10 100V 72982 8005H9AADW5Rl03K C56 283 0010 00 B010100 B039999 CAP FXD CER DI 0 05UF 100 20 50V 56289 273C20 C56 283 0341 00 8040000 CAP FXD CER DI 0 047UF 10 100V 72982 8131Nl45X7RO473K C57 283 0203 00 CAP FXD CER DI 0 47UF 20 50V 72982 8131NO75 E474M C66 283 0111 00 CAP FXD CER DI O lUF 208 50...

Page 70: ...45 00 CAP FXD ELCTLT 22UF 50 108 25V 56289 502D225 C844 283 0004 00 CAP FXD CER DI 0 02UF 80 208 150V 72982 855 558 Z5VO203Z CR23 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR24 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR53 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR55 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR71 152 0141 02 SE...

Page 71: ...L RF 200UH 80009 108 0537 00 LR820 108 0537 00 COIL RF 200UH 80009 108 0537 00 LR830 108 0537 00 COIL RF 200UH 80009 108 0537 00 LR840 108 0537 00 COIL RF 200UH 80009 108 0537 00 Q22A B 151 1042 00 SEMICOND DVC SE MATCHED PAIR FET 80009 151 1042 00 Q48 151 0190 00 XB050000 TRANSISTOR SILICON NPN 80009 151 0190 00 Q88 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 Q92 151 0271 00 TRANSISTOR S...

Page 72: ...4705 R14 315 0105 00 RES FXD CMPSN lM OHM 5 0 25W 01121 CB1055 R15 315 0824 00 RES FXD CMPSN 820K OHM 5 0 25W 01121 CB8245 R16 315 0274 00 RES FXD CMPSN 270K OHM 5 0 25W 01121 CB2745 R19 315 0274 00 RES FXD CMPSN 270K OHM 5 0 25W 01121 CB2745 R20 315 0103 00 RES FXD CMPSN l0K OHM 5 0 25W 01121 CB1035 R21 315 0510 00 RES FXD CMPSN 51 OHM 5 0 25W 01121 CB5105 R22 315 0272 00 RES FXD CMPSN 2 7K OHM 5...

Page 73: ...86 315 0470 00 RES FXD CMPSN 47 ORM 5 0 25W 01121 CB4705 R89 315 0103 00 RES FXD CMPSN 1OK OHM 5 0 25W 01121 CB1035 R90 315 0102 00 RES FXD CMPSN 1K OHM 58 0 25W 01121 CB1025 R91 315 0470 00 RES FXD CMPSN 47 OHM 5 0 25W 01121 CB4705 R92 315 0102 00 RES FXD CMPSN 1K OHM 5 0 25W 01121 CB1025 R93 321 0260 00 RES FXD FILM 4 99K OHM 18 0 125W 91637 MFF1816G49900F R94 321 0202 00 RES FXD FILM 1 24K OHM ...

Page 74: ...301 00 RES FXD FILM 13 3K OHM 1 0 125W 91637 MFF1816G13301F R308 321 0275 00 RES FXD FILM 7 15K OHM 1 0 125W 91637 MFF1816G71500F 8312 315 0201 00 RES FXD CMPSN 200 OHM 5 0 25W 01121 CB2015 R313 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 8314 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R315 315 0112 00 RES FXD CMPSN 1 1K OHM 5 0 25W 01121 CB1125 R321 315 0101 00 RES FXD CMPS...

Page 75: ...200 R431 321 0122 00 RES FXD FILM 182 OHM I 0 125W 91637 MFF1816G182ROF R432 315 0180 00 RES FXD CMPSN 18 OHM 5 0 25W 01121 CB1805 R433 315 0820 00 RES FXD CMPSN 82 OHM 5 0 25W 01121 CB8205 R434 323 0285 00 RES FXD FILM 9 09K OHM 1 0 50W 75042 CECTO 9091F 8435 321 0400 00 RES FXD FILM 143K OHM 1 0 125W 91637 MFF1816G14302F R436 315 0180 00 RES FXD CMPSN 18 OHM 5 0 25W 01121 CB1805 8437 315 0103 00...

Page 76: ...15 0154 00 RES FXD CMPSN 150K OHM S 0 25W 01121 CB1545 8754 315 0753 00 RES FXD CMPSN 75K OHM 5 0 25W 01121 CB7535 8761 315 0154 00 RES FXD CMPSN 150K OHM 5 0 25W 01121 CB1545 R764 315 0133 00 RES FXD CMPSN 13K OHM S 0 25W 01121 CB1335 R771 315 0753 00 RES FXD CMPSN 75K OHM 5 0 25W 01121 CB7535 8772 321 0356 00 RES FXD FILM 49 9K OHM 1 0 125W 91637 MFF1816G49901F R773 315 0154 00 RES FXD CMPSN 150...

Page 77: ...0126 00 MICROCIRCUIT LI TRIGGER AMPLIFIER 80009 155 0126 00 U75 156 0158 00 MICROCIRCUIT LI DUAL OPERATIONAL AMPLIFIER 80009 156 0158 00 U85 155 0109 01 MICROCIRCUIT LI MONOLITHIC TRIG 80009 155 0109 01 U220 155 0049 01 BO10100 B042459 MICROCIRCUIT DI MONOLITHIC SWEEP CONTROL 80009 155 0049 01 U220 155 0049 02 B042460 MICROCIRCUIT DI SWEEP CONTROL W LOCKOUT 80009 155 0049 02 U416 156 0067 02 MICRO...

Page 78: ...ns see your Tektronix Catalog or contact your Tektronix Field Office OPTION 2 This option provides an X Y display feature Horizontal X and vertical Y deflection signals are applied to the inputs of either a dual trace amplifier or two single amplifier units the horizontal signal is then routed through the amplifier and main frame trigger paths to the Option 2 instrument A push button control DISPL...

Page 79: ...deflection factor accuracy and phase shift information contained in this section Description contained in this section Operation is de scribed with reference to Section 8 diagram numbers 7 3 and 4 Option 2 A description of the X Y display mode Operating Instructions Specification and Theory of Operation is contained in this section All circuitry unique to Option 2 is shown on diagram 7 Instrument ...

Page 80: ...splay 1 Set the DISPLAY MODE push button to X Y Set the mainframe intensity control for convenient brightness of the displayed spot 2 Any available vertical channels may be used for the X and Y signal inputs DUAL TRACE AMPLIFIERS Set the vertical display mode controls of both the amplifier and mainframe to select the Y vertical signal set the trigger source controls OPTION 2 OPERATING INSTRUCTIONS...

Page 81: ...perate normally When the DISPLAY MODE push button is pressed and released to the OUT X Y pos ition an X axis signal can be coupled through the instrument to the oscilloscope horizontal for X horizontal deflection All other front panel controls and the readout display func tion are disabled in this mode 1958 15 Option 2 Page 2 Figure 1 Option 2 Display Mode switch provided An external X signal can ...

Page 82: ...the following setup procedure for the amplifier units to be used DUAL TRACE AMPLIFIERS Set the vertical display mode controls of both the amplifier and mainframe to select the input of the Y vertical signal set the trigger source controls of both the amplifier and mainframe to select the input of the X horizontal signal SINGLE TRACE AMPLIFIERS Set the vertical display mode control of the mainframe...

Page 83: ... time of the oscilloscope system must be 20 minutes or more X BANDWIDTH Supplemental Information For mainframes with optional X Y horizontal compensa tion the extra delay of the mainframe trigger path adds to the phase shift error above 50 kHz Example In the Tek tronix 7904 Option 2 mainframe the trigger path adds about 2 of error at 1 MHz which increases its X Y phase shift specification of 2 to ...

Page 84: ...Y MODE button is pressed and latched to the IN TIME BASE position all time base electrical operation and functions are the same as described for the standard instrument see Section 3 Theory of Operation The Option 2 instrument however has the internal trigger and sweep signal paths routed through the X Y Switch Board The following description explains the signal paths in more detail The internal t...

Page 85: ...erator is thereby effectively disabled in this mode The resultant H I at the collector of Q372 is coupled through emitter follower Q382 to the mainframe to keep the crt display unblanked at all times Option 2 Page 6 READOUT INHIBIT In the X Y mode the Readout In hibit level at interface connector A37 is held HI This pre vents the mainframe readout circuitry from producing a readout display from th...

Page 86: ...rd Panel Adjustment Plug Index Modified Component See Parts Lis Refer to Waveform Refer to Diagram Number SEL Value Selected at Factory Coaxial Connector Panel Connector Assembly Number Board Name Etched Circuit Board Outlined in Black Schematic Name and Number A Assembly separable or repairable H Heat dissipating device heat sink FIT Thermistor circuit board etc heat radiator etc S Switch AT Atte...

Page 87: ...Fig 8 1 Semiconductor lead configurations ...

Page 88: ...Fig 8 2 Location of circuit boards in the 7B80 ...

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Page 94: ...C844 2 1 J5 2B 0203 4 1 0428 3C R218 21 R315 2G C312 2F CR201 4K J6 3B 0204 3K 0434 4D R222 51 R321 2C C324 2G CR202 3K J100 11 Q206 3K 0438 4C R224 3J R322 21 C330 3G CR206 3K J200 11 Q210 21 Q448 3C R226 2J R323 2C C331 3G CR208 3K J300 2K 0214 21 0458 3C R227 4K R324 2F C332 3F CR224 2J J400 5 1 Q230 4K 0732 3G R228 3 1 R325 2 C333 3F CR225 2J J500 5J 0234 4K Q844 2 1 R231 3K R326 2F C334 3F CR...

Page 95: ...3F R347 2B R433 4D R714 1H S230 2K 13 2G R351 1F R434 3D R715 1F S435 2E 14 2G R352 2F R435 2B R717 2H S800 3G 15 2G 21 2G R353 2G R436 413 R721 2H R354 2G R437 3C R722 4E T35 3A 22 2H 23 2G R355 1G R438 4C R723 4E R356 4K R439 2E R724 4E TP345 2F 24 2H 25 2G R358 3K R440 3C R728 1H R362 4 1 R442 3D R729 2H U220 3 1 26 2H R371 4B R444 3C R731 3H U416 4E 30 3G R372 4B R445 2D R732 3H U722 3H 31 3G ...

Page 96: ...6 5C R23 2E R62 1C S10 4B C51 3A J200 1E R29 1C R63 1C S20 1B C52 3B J300 2C R30 4A R64 3B S50 1B C56 2B J400 5D R31 4C R65 3B C57 2B R32 5C R67 5B U35 4C C66 3C LR3 5D R33 5C R68 3A U55 3B C68 4B LR5 5E R34 5C R69 38 U65 3B C69 3B LR7 5E R35 4C R72 3C U75 3C C72 3C LR70 3C R36 4C R73 4C U85 2D C73 4C LR75 4C R37 4C R74 3C C74 3C R41 4B R76 4C C76 4C P60 3B R42 4A R80 1D A B C D E 6 CM r a 1119 T ...

Page 97: ...SLOPE Voltage Conditions The voltages shown on the diagram were obtained using a digital multimeter with a 10 M92 input impedance Tektronix DM 501 Digital Multimeter or Tektronix 71313 Digital Multimeter used with readout equipped 7000 series oscilloscope Waveform Conditions The waveforms shown below were obtained using a test oscilloscope system with 10 M92 input impedance and at least 60 MHz ban...

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Page 100: ...R217 21 R31 2G 8314 2G C228 2J C844 2J J5 2B Q203 4J 0428 3C R218 21 2G C312 2F CR201 4K J6 3B 0204 3K Q434 4D R222 51 R321 2G C324 2G CR202 3K J100 11 0206 3K 0438 4C R224 3J R322 2H C330 3G CR206 3K J200 11 0210 21 Q448 3C R226 2J R323 2G C331 3G CR208 3K J300 2K 0214 21 0458 3C R227 4K R324 2H C332 3F CR224 2J J400 5J 0230 4K Q732 3G R228 3J R325 2G C333 3F CR225 2J J500 5J Q234 4K Q844 2J R231...

Page 101: ...1 R345 1C R431 3D R712 1H R844 2J R38 2F i 31 R346 2B R432 3E R713 1H 12 3F i 21 R31 R3 3 R347 2B R433 4D R714 1H S230 2K 2G I 21 R351 1F R434 3D R715 1F S435 2E R314 2G 1 21 R352 2F R435 2B R717 2H S800 3G 8315 2G t 51 R353 2G R436 4D R721 2H R321 2G 1 3 1 R354 2G R437 3C R722 4E T35 3A 2H i 2J R32 R323 R355 1G R438 4C R723 4E 2G F 4K R356 4K R439 2E R724 4E TP345 2F R324 2H 1 3 1 R358 3K R440 3C...

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Page 103: ... SLOPE Voltage Conditions The voltages shown on the diagram were obtained using a digital multimeter with a 10 MS2 input impedance Tektronix DM 501 Digital Multimeter or Tektronix 7D13 Digital Multimeter used with readout equipped 7000 series oscilloscope Waveform Conditions The waveforms shown below were obtained using a test oscilloscope system with 10 M92 input impedance and at least 60 MHz ban...

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Page 106: ...4B R215 31 R312 C222 51 C830 3B CR724 4E Q201 4K Q382 5B R216 21 R313 C225 2J C840 2B CR723 2H Q202 4K 0424 3D R217 21 R314 C228 2 1 C844 2 1 Q203 4J 0428 3C R218 21 R315 C312 2F CR201 4K J5 2B 0204 3K Q434 4D R222 51 R321 C324 2G J6 3B 0206 3K Q438 4C R224 3J R322 C330 3G CR202 3K J100 11 Q210 21 Q448 3C R226 2J R323 C331 3G CR206 3K J300 00 11 Q214 21 0458 3C R227 4K R324 C332 3F CR208 3K J 2K Q...

Page 107: ...R711 2H R842 2J 2F R345 1C R431 3D R712 1H R844 2J 3F R346 2B R432 3E R713 1H 2G R347 2B R433 4D R714 1H S230 2K 2G R351 1F R434 3D R715 1F S435 2E 2G R352 2F R435 2B R717 2H S800 3G 2G R353 2G R436 4D R721 2H 2H R354 2G R437 3C R722 4E T35 3A 2G R355 1G R438 4C R723 4E 2H R356 4K R439 2E R724 4E TP345 2F 2G R358 3K R440 3C R728 1H 2H R362 4J R442 3D R729 2H U220 3J 3G R371 4B R444 3C R731 3H U416...

Page 108: ...KT NO GRID COORD CKT NO GRID COORD CKT NO GRID COORD CR725 1C R751 2B R782 2D CR751 2B R752 2B R783 2D CR752 2B R756 2C R784 2C C R772 2D R761 2F R793 2E CR773 2D R764 2F R794 2E CR782 2D R771 2D C R783 2D R772 2D S725 2C R773 2D S800 1C P21 1H R779 2D R781 2D R725 2H ...

Page 109: ... SLOPE Voltage Conditions The voltages shown on the diagram were obtained using a digital multimeter with a 10 MSE input impedance Tektronix DM 501 Digital Multimeter or Tektronix 7D13 Digital Multimeter used with readout equipped 7000 series oscilloscope Waveform Conditions The waveforms shown below were obtained using a test oscilloscope system with 10 MSE input impedance and at least 60 MHz ban...

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Page 112: ...3D R217 21 R314 2 C228 2J C844 2J J5 2B Q203 4J Q428 3C R218 21 R315 2 C312 2F J6 3B Q204 3K Q434 4D R222 51 R321 2 C324 2G CR201 4K J100 11 Q206 3K 0438 4C R224 3J R322 2 C330 3G CR202 3K J200 11 Q210 21 Q448 3C R226 2 1 R323 2 C331 3G CR206 3K J300 2K Q214 21 Q458 3C R227 4K R324 2 C332 3F CR208 3K J400 5J Q230 4K Q732 3G R228 3 1 R325 2 C333 3F CR224 2 1 J500 5 1 Q234 4K Q844 2J R231 3K R326 2 ...

Page 113: ...R424 3D R458 3D R749 4F R275 4A R341 2C R426 2D R459 3C R821 5C R301 2F R342 2C R427 2C R706 1H R832 1J R303 2F R343 2C R428 2C R710 1F R841 2J R307 2F R344 1B R430 4D R711 2H R842 2J R308 2F R345 1C R431 3D R712 1H R844 2J R312 3F R346 2B R432 3E R713 1H R313 2G R347 2B R433 4D R714 1H S230 2K R314 2G R351 1F R434 3D R715 1F S435 2E R315 2G R352 2F R435 2B R717 2H S800 3G R321 2G R353 2G R436 4D ...

Page 114: ...RID COORD CKT NO GRID COORD CKT NO GRID COORD CR725 1C R751 28 R782 2D CR751 2B R752 2B R783 2D CR752 2B R756 2C R784 2C CR772 2D R761 2F R793 2E CR773 2D R764 2F R794 2E CR782 2D R771 2D CR783 2D R772 2D S725 2C R773 213 S800 1C P21 1H R779 2D R781 2D R725 2H ...

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Page 117: ... Q424 3D R217 21 R314 C228 2J C844 2J J5 2B 0203 4J 0428 3C R218 21 R315 C312 2F J6 3B Q204 3K Q434 4D R222 51 R321 C324 2G CR201 4K J100 11 Q206 3K Q438 4C R224 3J R322 C330 3G CR202 3K J200 11 0210 21 0448 3C R226 2J R323 C331 3G CR206 3K J300 2K 0214 21 0458 3C R227 4K R324 C332 3F CR208 3K J400 5J Q230 4K Q732 3G R228 3J R325 C333 3F CR224 2J J500 5 1 0234 4K 0844 2J R231 3K R326 C334 3F CR225...

Page 118: ...1 2C R426 2D R459 3C R821 5C 1 21 R301 2F R342 2C R427 2C R706 1H R832 1J 2 21 R303 2F R343 2C R428 2C R710 1F R841 2J 3 31 R307 2F R344 1B R430 4D R711 2H R842 2J 4 21 R308 2F R345 1C R431 3D R712 1H R844 2J 5 31 R312 3F R346 2B R432 3E R713 1H 6 21 R313 2G R347 2B R433 413 R714 1H S230 2K 7 21 R314 2G R351 1F R434 3D R715 1F S435 2E 8 21 R315 2G R352 2F R435 2B R717 2H S800 3G 2 51 R321 2G R353 ...

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Page 122: ...7B80 3 A B F JE a 0 TIG 0 El 1986 54 Fig 8 14 A5 X Y Switch circuit board assembly A5 X Y SWITCH CKT NO GRID COORD CKT NO GRID COORD CR965 1B S935 3B S936 3B R961 2B R962 2B T935 2D R965 1B R972 1B ...

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Page 125: ... 1l oSer dyi r W 1Seee o We H lloff sJil R80 SLOPE BAL Fig 8 16 Location of Triggering adjustments R85 DC BAL R430 C330 MAG GAIN 50 ns TIMING Fig 8 15 Location of Sweep Timing adjustmoo ...

Page 126: ... R715 10 ms TIMING C330 50 ns TIMING Sweep Timing adjustments A2 TRIGGER ...

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Page 129: ...ng parts Attaching parts must be purchased separately unless otherwise specified In the Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item Name identification the U S Federal Cataloging Handbook H6 1 can be utilized where possible ITEM NAME INCH ELCTRN ELECTRON NUMBER SIZE ACTR ACTUATOR ...

Page 130: ...9 BRISTOL SOCKET SCREW DIV OF O BOX 2244 40 BRISTOL ST P WATERBURY CT 06720 AMERICAN CHAIN AND CABLE CO INC 71590 CENTRALAB ELECTRONICS DIV OF 858 FORT DODGE IA 50501 GLOBE UNION INC P 0 BOX 446 MORGAN ST CINCINNATI OH 45206 73743 FISCHER SPECIAL MFG CO 73803 TEXAS INSTRUMENTS INC METALLURGICAL ATTLEBORO MA 02703 MATERIALS DIV 34 FOREST STREET 74445 HOLO KROME CO 31 BROOK ST WEST HARTFORD CT 06110...

Page 131: ... 18 _____ 1 LAMP LED LIGHT EMITTING DIODE SEE CR220 EPL 19 _____ _____ 1 LAMP LED LIGHT EMITTING DIODE SEE CR232 EPL 20 352 0157 00 3 LAMPHOLDER WHITE PLASTIC 80009 352 0157 00 21 _____ _____ 1 RESISTOR VAR SEE R60 EPL ATTACHING PARTS 22 210 0583 00 1 NUT PLAIN HEX 0 25 32 X 0 312 INCH BRS 73743 2X20224 402 23 _____ 1 RESISTOR VAR SEE R410 R415 EPL ATTACHING PARTS 24 210 0583 00 2 NUT PLAIN HEX 0 ...

Page 132: ...0 156 INCH LONG EYELET METALLIC 0 59 OD 07707 SE 25 62 343 0499 01 1 UNIT CLIP SWITCH REAR 7 5 MM 1 80009 343 0499 01 ATTACHING PARTS 63 210 3033 00 1 X 0 156 INCH LANG EYELET METALLIC 0 59 OD 07707 SE 25 64 214 0973 00 1 OVAL X 0 187 H HEAT SINK ELEC 0 28 X 0 18 80009 214 0973 00 65 136 0260 02 1 CLEARANCE SOCKET PLUG IN 16 CONTACT LAW 82647 C951601 66 136 0514 00 3 CONTACT SOCKET PLUG IN MICROCI...

Page 133: ... 0180 00 ATTACHING PARTS 101 354 0390 00 1 RING RETAINING 0 338 ID X 0 025 THK STL 79136 5100 37MD 102 384 0878 08 1 SHAFT CAM SW OUTER CONCENTRIC W DRIVER 80009 384 0878 08 103 105 0696 00 1 DRUM CAM SW CAM SWITCH 80009 105 0696 00 104 210 0406 00 4 NUT PLAIN HEX 4 40 X 0 188 INCH BRS 73743 2X12161 402 105 401 0178 01 1 BEARING CAM SW CENTER REAR 80009 401 0178 01 106 351 0180 00 1 SLIDE GUIDE SW...

Page 134: ... 135 426 0505 11 1 FR SECT PLUG IN TOP 80009 426 0505 11 136 426 0499 11 1 FR SECT PLAG IN BOTTOM 80009 426 0499 11 137 131 0707 00 50 CONNECTOR TERM 0 48 L 22 26AWG WIRE 22526 75691 005 138 352 0169 00 1 CONN BODY PL EL 2 WIRE BLACK 80009 352 0169 00 139 352 0161 05 1 CONN BODY PL EL 3 WIRE GREEN 80009 352 0161 05 352 0161 07 1 CONN BODY PL EL 3 WIRE VIOLET 80009 352 0161 07 140 352 0162 00 1 CON...

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Page 137: ... No Mfr No Part No Eff Dscont Qty s a n s Name Description Code Mfr Part Nu mbe r 2 STANDARD ACCESSORIES 1 070 1958 00 1 MANUAL TECH OPERATORS 80009 070 1958 00 2 070 1959 00 1 MANUAL TECH INSTRUCTION 80009 070 1959 00 71380 TIME BASE ...

Page 138: ...10100 B019999 1 EXTENSION SHAFT 2 137 INCH LONG 80009 384 1425 00 B020000 1 EXTENSION SHAFT 10 294 INCH LONG PLASTIC 80009 384 1445 00 1 ACTR ASSY PB 1 PUSH 10MM 80009 263 0011 00 1 ACTR ASSY PB 1 MOMENTARY 11 MM 3 CONTACT 80009 263 0011 06 2 CLIP SWITCH FRONT 7 5 MM 1 UNIT 80009 343 0495 01 ATTACHING PARTS 2 EYELET METALLIC 0 218 L X 0 059 OD BRS 07707 SE 27 Index Tektronix No Part No 3 1 426 107...

Page 139: ...Since the change information sheets are carried in the manual until all changes are permanently entered some duplication may occur If no such change pages appear following this page your manual is correct as printed SERVICE NOTE Because of the universal parts procurement problem some electrical parts in your instrument may be different from those described in the Replaceable Electrical Parts List ...

Page 140: ...10 and 1 ps Marker amplifier pro vides positive or negative time marks of 25 V min Marker intervals of 1 and 1 sec 10 1 and 1 ms 10 and 1 is 2901 Marker outputs 5 sec to 0 1 ps Sinewave available to 50 10 and 5 ns Separate trigger pulses from 5 sec to 0 1 ps Multiple time marks can be gene rated simultaneously NOTE All TM 500 generator outputs are short proof All TM 500 plug in Instruments require...

Page 141: ...e amplifier unit deflection factor to 1 volt division 0 25 division Set the TRIGGERING LEVEL control for a stable display d ADJUST R49 Trigger Sensitivity for a stable crt display e Set the amplifier unit deflection factor to 2 volts division 0 125 division Set the TRIGGERING LEVEL control for a stable display stable display may not be possible f ADJUST R49 Trigger Sensitivity to a setting that pr...

Page 142: ... INFORMATION PRODUCT 7B80 7B85 ELECTRICAL PARTS LIST CHANGES CHANGE TO Q98 151 0342 00 TRANSISTOR SILICON PNP 2N4249 Q201 151 0221 00 TRANSISTOR SILICON PNP 2N5771 Q352 151 0221 00 TRANSISTOR SILICON PNP 2N5771 Q356 151 0221 00 TRANSISTOR SILICON PNP 2N5771 Q362 151 0221 00 TRANSISTOR SILICON PNP 2N5771 CHANGE REFERENCE 1 134715 DATE 9 21 78 ...