COMMITTED TO EXCELLENCE CHECK FOR CHANGE INFORMATION REAR O THIS MANUAL. UIRE CLOCK Tektronix, Inc . P.O .
Copyright 1980 Tektronix, Inc. All rights reserved . Contents of this publication may not be reproduced in any form without the written permission of Tektronix, Inc . Ll~ Products of Tektronix, Inc. and its subsidiaries are covered by U .S . and foreign patents and/or pending patents . TEKTRONIX, TEK, SCOPE-MOBILE, and 19!!44 are registered trademarks of "Tektronix, Inc . TELEOUIPMENT is a registered trademark of Tektronix U.K . Limited . Printed in U.S .A.
71387 Instruction PAGE LIST OF ILLUSTRATIONS . . . . . . . . . . LIST OF TABLES . . . . . . . . . . . . . . . . . . OPERATORS SAFETY SUMMARY . . SERVICING SAFETY SUMMARY . . . . .. . . .. ... .. . .. .. .. .. . . . . .. .. .. .. . . . . ... . .. ... ... .. . . .. ... .. . .. . . .. .. . ... . . . . .. .. .. .. . . . . SECTION 1----OPERATING INSTRUCTIONS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONTROLS, CONNECTORS, AND INDICATORS . . . . . .
71387 Instruction PAGE PAGE VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 CAM SWITCH LUBRICATION . . . . . . . . . . . . . . . . . . . . 4-2 SEMICONDUCTOR CHECKS . . . . . . . . . . . . . . . . . . . . . . . 4-2 ADJUSTMENT AFTER REPAIR . . . . . . . . . . . . . . . . . . . . . 4-2 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
713£37 Instruction FIG . NO . Frontispiece 1-1 1-2 1-3 1-4 1-6 1-7 2-1 3-1 3-2 3-3 3-4 3-5 3-6 4-2 4-3 AGE 71387 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii of release latch . . . . . . . . . . . . . . . . . . . . . . . .Locatin 1 -1 Front-panel controls, connectors, and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Single Sweep Acquisition . . . . . . . . . . . . . . . . . . . . . . .
TABLE NO . 1-1 2-1 2-2 2-3 2-4 3-1 3-2 3-3 3-4 3-5 4-1 5-1 5-2 5-3 5-4 5-5 5-6 PAG E TIME/DIV Setting Relationship To 7887 Internal Acquire Clock Rep Rate . . . . . . . . . . . . . . . . . 1-7 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . 2-1 Mainframe Horizontal Compatibility . . . . . . . . . . . . . 2-3 Environmental Characteristics . . . . . . . . . . . . . . . . . . 2-4 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . .
'1381 Instruction The general safety information in this part of the summary is for both operating and servicing personnel. Specific warnings and cautions will be found throughout the manual where they apply, but may not appear in this summary. TERMS IN THIS MANUAL CAUTION statements identify conditions or practices that could result in damage to the equipment or other property . WARNING statements identify conditions or practices that could result in personal injury or loss of life .
71387 Instruction DANGER ARISING FROM LOSS OF GROUND Upon loss of the protective-ground connection, all accessible conductive parts (including knobs and controls that may appear to be insulating), can render an electric shock. DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES To avoid explosion, do not operate this product in an atmosphere of explosive gases unless it has been specifically certified for such operation .
713$7 Instruction FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary DO NOT SERVICE ALONE Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present. USE CARE WHEN SERVICING WITH POWER ON Dangerous voltages exist at several points in this product. To avoid personal injury, do not touch exposed connections and components while power is on .
71387 Instruction TRIGGERING Yoaf F-P AU T0 Flit COMING AUTO AC LF W *OW AC IF KJ Poernow OC HOLD OFF MAG II '~ O~IrT XI aI ~' IAN ACQUIRE STOP DELAY EXT CLOCK IN Its IIh USX) SWIM CAL II + 1 OUT+1! EXT TRIG IN y S 2f4y 2788-1 71387 FEATURES The 71387 Time-Base unit Pretrigger Acquire Clock provides calibrated sweep rates from 5 seconds to 10 nanoseconds and triggering to 400 megahertz for 7000-Series Oscilloscopes.
Section 1--71387 The 71387 Time-Base unit operates with a Tektronix 7700-, 7800-, or 7900-series oscilloscope mainframe and a 7Aseries amplifier unit to form a complete oscilloscope system . This section describes the operation of the front-panel controls and connectors, provides general operating information, a functional check procedure, and basic applications for this instrument . INSTALLATION The time-base unit operates in the horizontal plug-in compartment of the mainframe .
Operating Instructions 7B87 TIME BASE uwn W/PRETRIGGER ACQUIRE CLOCK Figure 1-2 . Front-panel controls, connectors, and indicators .
Operating Instructions---71387 TRIGGERING LEVEL Control---Selects a point on the trigger signal where triggering occurs . SLOPE Switch Permits sweep to be triggered on negative- or positive-going portions of the trigger signal . READY Indicator--Illuminates when sweep circuit is armed (SINGLE SWEEP Mode) . TRIG'D Indicator Illuminates when the display is triggered . MODE Pushbuttons---Selects the operating mode of the triggering circuit .
Operating Instructions--713187 4. Turn on the mainframe and allow at least 20 minutes warmup . TRIGGERING 5 . Set the mainframe vertical and horizontal modes to display the plug-in units used and adjust the intensity and focus for a well-defined display . See the oscilloscope mainframe and amplifier unit instruction manuals for detailed operating instructions . 1 . Obtain a display as described in the preceding Normal Sweep procedure . SWEEP FUNCTIONS NORMAL SWEEP .
Operating Instructions-71387 14 . Note that one trace occurs and that the READY indicator extinguishes when the mainframe calibrator signal is reconnected to the amplifier unit input. PRETRIGGER ACQUIRE CLOCK FUNCTIONS NOTE The following procedure must be performed with the 71387 installed in the B horizontal compartment of a Tektronix 7854 Oscilloscope. 1 . Install the 71387 in the 7854 Oscilloscope B horizontal compartment and install an amplifier unit in the mainframe left vertical compartment .
Operating Instructions---7887 11 . To trigger the single-sweep display, set the amplifier unit input coupling to dc . Triggering occurs when the amplifier coupling switch is set to dc . The first six milliseconds of the display is pretrigger . (Noise in the Stored Single Sweep may be displayed at the Single Sweep Trigger Point as a result of the coupling switch contact closure .) GENERAL.
Operating Instructions---7887 When using the single-sweep mode to photograph waveforms, the graticule may have to be photographed separately in the normal manner to prevent over exposing the film . Be sure the camera system is well protected against stray light, or operate the system in a darkened room . For repetitive waveforms, press the SINGLE SWP RESET button only once for each waveform unless the signal is completely symmetrical . Otherwise, multiple waveforms may appear on the film .
Operating Instructions--71387 The AQS stored single-sweep display is effectively 1000 times slower than the real-time display; however, the ACQUIRE-STOP DELAY time (post-trigger time) remains unchanged and becomes insignificant compared to the digitized sweep . Therefore, the stored single-sweep display is for practical purposes all pretrigger . EXT TIME/DIV = 102.4 x External Clock Period or 102.
Operating Instructions--7887 occurs (pretrigger---see Fig . 1-3) . The exact amount of the post-trigger display is indicated by the CRT readout. Then, without changing other triggering controls, select the single-sweep mode by pressing the SINGLE SWP RESET pushbutton . Set the 7854 to the Stored CRT Display mode and to the AQS (acquire single-shot) WFIVI Acquisition mode . When the AQ.S button is presed, the 7854 will respond by lighting the "Busy" LED and blanking the entire screen .
Operating Instructions---71387 0000 (SLOPE) (LEVEL) CRT DISPLAY OBTAINED WITH SLOPE SWITCH SET TO POSITIVE(+) POSITIVE (+) SLOPE TRIG'D @dOPL LEVEL 0000 TRIGV gLC-D[E ;: LEVEL 0- + 0000 CRT DISPLAY OBTAINED WITH SLOPE SWITCH SET TO NEGATIVE (-) TRIG'D &dOO FCi ; ; LEVEL - -0- + 090 C19588 -7 1 Figure 1-4 . Effect of LEVEL control and SLOPE switch on crt display .
Operating Instructions-71387 LINE . The LINE position connects a sample of the powerline voltage from the mainframe to the trigger circuit . Line triggering is useful when the input signal is timerelated (multiple or submultiple) to the line frequency . It is also useful for providing a stable display of a linefrequency component in a complex waveform . EXTERNAL . The EXT position connects the signal from the EXT TRIG IN connector to the trigger circuit .
Operating Instructions----7387 magnified sweep is more than 100 divisions; any 10division portion can be viewed by adjusting the POSITION and FINE POSITION controls to bring the desired portion into the viewing area . When the MAG switch is set to X10 (OUT), the equivalent magnified sweep rate can be determined by dividing the TIME/DIV setting by 10 ; the equivalent magnified sweep rate is displayed on the crt readout.
Operating Instructions---71387 4. Set the TRIGGERING switches and LEVEL control for a stable display (see General Operating Information for selecting proper triggering) . 5 . Set the vertical deflection factor and position control for about a 5-division display, vertically centered on the graticule. 6. Set the TIME/DIV switch and POSITION control for 1 complete cycle displayed within the center 8 graticule divisions as shown in Figure 1-7 . 7 .
Operating Instructions---711387 PULSE WIDTH MEASUREMENTS Perform the following procedure to measure the pulse width of a displayed waveform : 1 . Install the time-base unit in a mainframe horizontal compartment (either A or B Horiz in a four-compartment mainframe) . 2. Connect the signal to be measured to the vertical unit input . MEASURE HORIZONTAL DISTANCE FROM! A TO B (10% TO 90%) 3. Set the mainframe horizontal- and vertical-mode switches to display the time base and vertical unit .
Operating Instructions--7887 Example : Assume that the horizontal distance between the 50% amplitude points is 3 divisions, and the TIME/DIV switch setting is 0 .1 ms (see Fig . 1-9) . Substituting values : Pulse Width = -3-X-1' -ms- = 0 .
Section 2--7887 IFI This instrument will meet the electrical characteristics listed in Table 2-1, following complete adjustment . The following electrical characteristics apply over an ambient temperature range of 0° to +50° C, except as otherwise indicated . Warmup time for given accuracy is 20 minutes. TABLE 2-1 Electrical Characteristics Performance Requirement SWEEP GENERATOR Sweep Rates Calibrated Range 5 s/div to 10 ns/div in 27 steps .
Specification---71387 TABLE 2-1 (CONT) Electrical Characteristics Performance Requirement SWEEP GENERATOR (CON Trigger Holdoff Time Minimum Holdoff Setting 5 s/Div to 1 us/Div 2 times TIME/DIV setting or less . 0.5 u/Div to 10 ns/Div 2.0 Ns or less . Extends holdoff time through at least 2 sweep lengths for sweep rates of 20 ms/div or faster .
Specification--71387 TABLE 2-1 (CONT) Electrical Characteristics Characteristic Performance Requirement PR TRIGGER ACQUIRE CLOCK Internal Acquire (AQS) Clock Frequency Accuracy (INTERNAL and - INT 20 .48 mHz (millihertz) to 20.48 MHz as determined by the TIME/DIV X10 MAG, and INT _ 1000 switches . 1-000) Range INTERNAL (X1 MAG) 18 steps in a 1-2-5 sequence from 20 .48 Hz to 10 .24 MHz. INTERNAL (X10 MAG) X10 magnifier increases frequency by a factor of 10 to a maximum of 20 .
TABLE 2.3 Environmental Characteristics Red*, to the Specification section of the associated mainframe manual . TABLE 2-4 Physical Characteristics Characteristic Information Net Weight Approximately 2 .6 pounds <1 .3 kilogram) . Dimensions See Figure 2'1 ' dimensional drawing . STANDARD ACCESSORIES 1 oo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specification--71387 a rN F_Z U) 00z 0 :_ J FQ Q W W Q W d O 3 0 N O N cO c U In .c c C O O N v m .2) .o-. . W H Figure 2-1 . 7887 dimensional drawing .
Section 3---7887 This section of the manual describes the circuitry used in the 71387 Time-Base . The description begins with a discussion of the instrument, using the block diagram shown in Figure 3-1 . Next, each circuit is described in detail with a block diagram provided to show the major interconnections between circuits, and the relationship of the front-panel controls to each circuit .
Theory of Operation---71387 ROW & COLUMN DATA TIME/DIV READOUT (INT) TRIGGER IN A20 ~ 1320 SIGNAL (SWEEP) OUTPUT LINE TRIGGER '44 1311 SWEEP GATE (UNBLANKING) CH 1 ROW DATA B37 B5 CLOCK A17 AUX Z-AXIS _-(AUTO) -- HOLD OFF ~4 A 16-B7- r B16 B4 A38 B9 AUX Y-AXIS HOLD OFF CH 2 COLUMN DATA DELAY TIME ( READOUT DELAY GATE C1961-1 Figure 3-1 . Basic block diagram of the 71387 Delaying Time Base Unit .
Theory of Operation---7B87 FRONT-PANEL DISTRIBUTION The Front-Panel Distribution diagram shows the interconnections between front-panel functions (controls, connectors, and indicators) and circuit boards in the 7887 . TRIGGER GENERATOR The Trigger Generator provides a stable display by starting the Sweep Generator (diagram 4) at a selected point on the input waveform . The triggering point can be varied by the LEVEL control and may occur on either the positive or negative slope of the waveform .
T m 0 0 O CD d 0 sio S50 S20 s W co 9 SLOPE BALANCE AUTO NABLs. GATE DIAG RSO v LINE TRIGGER ~ A4 E-. CD . CL O 0 7C + A20 TRIGGER IN a - E-- TRIGGER SOURCE 7 GATE GATE GENERATOR 088, 092 096, 098 TRIGGER DISABLE DIAG 01 R60 1 U65 820 f9 -131 TRIGGER TRIGGER SOURCE SELECTOR AND AMPLIFIER PEAK-TO-PEAK LEVEL RANGE AND AUTOMATIC GAIN CONTROL U55A PARTIAL U65 Z-AXIS GATE DIAG AUTOSENSE DIAG DELAY MODE CONTROL MAINFRAME DIAG fD G1 O PEAK-TO-PEAK AUTO TRIGGER GENERATOR .
Theory of Operation-71387 the feedback amplifier (consisting of_ U55A and pins 1 and 20 of U65) increases as the Peak Detector signal amplitude is reduced, thereby producing a constant trigger signal level at U65 pins 16 and 17 . 6 and 10 . A high level disables the Trigger Generator to allow enough time for the sweep generator to stabilize before another trigger pulse starts the next sweep . The range of the front-panel LEVEL control is zero at minimum triggering signal amplitude .
Theory of Operation--7887 AUTO MODE OPERATION WITH TRIGGER SIGNAL AUTO MODE OPERATION WITHOUT TRIGGER SIGNAL Figure 3-3. Timing diagram for Gate Generator stage (Q92, Q96, Q98) . Auto Mode The Auto Control stage produces a free-running reference trace (bright base line) in the absence of a trigger signal . A high level from MODE switch S230 is inverted by Q230 to set U220 pin 19 low, which selects AUTO MODE operation.
Theory of Operation---7B87 pulse at U220 pin 17 from falling low until the timing capacitors have discharged . Transistors Q212 and Q214 and front-panel HOLD OFF control R210 provide variable current to the timing components to change the hold-off time period . LOCKOUT BUFFER AMPLIFIER A Sweep Lockout pulse (high) may be initiated at interface connector pin B8 by mainframe switching functions .
Theory of Operation---71387 S800 I I I I I I I I VARIABLE R725 TIMING RESISTORS R'741-R749 I I I I SWP CAL R705 I I I I I I I REFERENCE --4-j VOLTAGE SOURCE R710-R715,R717 SOURCE CURRENT GENERATOR U722,0732 SWP CAL REFERENCE VOLTAGE TO DIAG TIMING CURRENT SOURCE RAMP VOLTAGE FOLLOWER Q334A,0334B Q338 SWEEP START GATE DIAG TIMING CAPACITORS C330, C331 C332, C334 C336 (1961-5)2788-105A Figure 3-5 . Detailed block diagram of Sweep Generator .
Theory of Operation.----7B57 Z-AXIS GATE ° DIAG SWEEP LOCKOUT' DIAG I SWEEP GATE GENERATOR Q362,0372 0382 A1 SWEEP GATE (UNBLANKING) SWEEP GATE GENERA - OR A SWEEP AUXILIARY SWEEP PREAMPLIFIER 0344 0346 B SWEEP AUX ~~ SAWTOOTH OUT SWEEP RAMP S435 MAG HORIZONTAL PREAMPLIFIER Q424,0428 0448,Q434 0438, 0458 COLUMN ANALOG DATA (READOUT MAG STATUS) DIAG OU -fPUI PREAMPLIFIER (1961--5)2788-107 Figure 3-5 (cont) . Detailed block diagram of Sweep Generator .
Theory of Operation--711387 A Reference Voltage Source is established by the -+50 volt supply and R710, R711, and R705 (front-panel SWP CAL adjustment) . 1 he MAG switch, S435, increases the Horizontal Preamplifier gain ten times by connecting R431 and R430 in parallel with R442 . The reference voltage is applied to the Source Current Generator stage . Operational amplifier U722 provides unity voltage gain and low output impedance.
Theory of Operation--71387 and no Delay Gate occurs . Unity-gain buffer U535A couples the voltage from the ACQUIRE-STOP DELAY control to the comparator . When the Sweep Ramp voltage at the base of Q522A exceeds the reference voltage from U535A, Q522A shuts off and 0512B turns on . Because Q522A is turned off, the low level at its collector turns off Q564, the input of Schmitt trigger pair Q564-Q568 . With Q564 turned off, Q568 conducts a greater current through 0574 .
Theory of Operation 71387 DELAY COMPARISON VOLTAGE-'TO-RAMP CONVERTER The Delay Comparison Voltage-to-Ramp Converter, U547, develops a negative-going ramp at CR552's anode . The current that flows through R537 and R539 (delay comparison current, determined by the ACQUIRE-STOP DELAY front-panel control) is integrated by U547 and C547 to form a negative-going ramp with a slope proportional to the delay comparison voltage .
Theory of Operation--- .7B87 7 . Output Clock Multiplexer . The Output Clock Multiplexer selects the output of the Internal Clock Multiplexer, the Internal Clock divided by 1000, or the signal from the EXT CLOCK IN connector to be the "acquire clock" signal . 8 . Intensify Circuit . The Intensify Circuit causes the mainframe to intensify the display between sweep start and the point selected by the ACQUIRE-STOP DELAY control . 9 . External Clock Buffer .
-4 m TABLE 3-2 Selected inputs or X1 and X10 Multiplexers X1 MAG 0.h il Selected Multiplexer Input i i U638 Setting of TIME/DIV Frequency of Clock (pin B5) 5 s 2 s 1 s .5 s .2 s .1 s 50 ms 20 ms 10 ms 5 ms 2 ms 1 ms .5 ms .2 ms .1 ms 50 Ps 20 Ns 10 Ps 20 .48 Hz 51 .2 Hz 102.4 Hz 204.8 Hz 512 Hz 1 .024 kHz 2 .048 kHz 5 .12 kHz 10 .24k z 20 .48 kHz 512 kHz 102.4 kHz 204.8 kHz 512 kHz 1 .024 MHz MHz 2 .048 5.12 MHz 10 .24 MHz 5 2 1 .5 .2 .1 50 20 10 ps ps Ps /is us Ps ns ns ns o N a 13 N .1. V .1.
Theory of Operation.--7138'7 to EXT/AQR, S645 grounds the enable line and stops the oscillator . FIRST DIVIDER The First Divider (FD) receives the reference frequency from the oscillator and divides it to form five subfrequencies (10 .24, 5.12, 2 .56, and 1 .28 MHz, and 512 kHz) . The FD consists of U635 and U636 . Counter U635 receives the 20 .48-MHz reference frequency on its A input and produces a half-frequency output (10.24 MHz) . The 10 .
Theory of Operation---71387 like the Delay Gate of a delaying time base . By setting the voltage on the Delay Mode line, the three AQS CLOCK/AQR pushbuttons, INTERNAL, INT - 1000, and EXT/AQR, cause operating modes that correspond to Independent, B Starts After Dly, and B Triggerable After Dly, respectively (if the 71387 is in the A Horiz plug-in compartment) . The Delay Mode line controls Q576 and Q574 . The voltage on the Delay Mode line, that goes to pin B2, is 0 V, +5 .0 V, and +3 .
Theory of Operation--71387 TIME/DIVISION READOUT TIME/DIVISION AND READOUT SWITCHING; The Readout Switching circuits provide sweep rate and delay time information to the mainframe readout system . Readout circuitry appears on the Time/Division and Readout Switching diagram (7) 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 plug-in units .
0 0 0 O TABLE 3-5 Readout Character Selection Encoded By Characters Time-Slot Decimal Uncalibrated (>) TS-1 i 0 through 9 blank space TS-3 1 i l ' 3 TS-4 TS-5 TS-6 TS-7 Determines decimal magnitude (number of zeros displayed or prefix change information) Indicates calibrated or uncalibrated sweep rates and delay times . 13751, 13752, 13756 ' i Scaling (Delay Time) s i 6 Defines the unit of measurement. i Indicates differential delaytime measurement.
Section 4---71387 This section of the manual contains information for performing preventive maintenance, troubleshooting, and corrective maintenance for this instrument . NTIV M I NTNAN C Preventive maintenance consists of cleaning, visual inspection, lubrication, etc . Preventive maintenance performed on a regular basis may prevent instrument breakdown and will improve the reliability of the instrument .
Maintenance----7B87 CAM SWITCH LUBRICATION In most cases, factory lubrication should be adequate for the life of the instrument . However, if the switch has been disassembled for replacement of switch sub-parts, a lubrication kit containing the necessary lubricating materials and instructions is available through any Tektronix Field Office . Order Tektronix Part 003-0342-01 . General Electric Versilube? silicone grease should be applied sparingly so that the lubricant does not get on the contacts .
Maintenance--7881 DUAL SINGLE B L- SIGNAL DIODE LIGHT EMITTING DIODE (II METAL CASE , TRANSISTORS a. .e. ... .._.-..,...a NOTE LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY VARY DUE TO VENDOR CHANGES OR INSTRUMENT MODIFICATIONS . C E G S G ti~il nip~l ~ '1 I( f j .1 dl S D PLASTIC CASE, TRANSISTORS -- PLASTIC CASE FE7S w.Y i L-, DUAL METAL _j CASE FET (1986-66)2788-51 Figure 4-2 . Semiconductor lead configuration .
Maintenance---71387 Figure 8-2, in the front of the diagrams section, shows the location and assembly number of each circuit board in this instrument . WIRING COLOR CODE SWITCH CAM IDENTIFICATION SEMICONDUCTOR LEAD CONFIGURATIONS Switch cam numbers shown on diagrams indicate the position 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.
Maintenance----71387 number etched on the circuit board . The J numbers, on the circuit boards, correlate to the J and P component numbers on the schematic diagrams . INTERFACE CONNECTOR PIN LOCATIONS The Interface circuit board couples the plug-in unit to the associated mainframe (oscilloscope) . Figure 4-5 identifies the pins on the interface connector as shown on Interface Connectors and Power Supply diagram 8 in the diagrams section .
Maintenance--7[387 9. Use a soldering iron that is connected to earth ground . 10 . Use only special anti-static suction type or wick type desoldering tools. 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 .
Connect oscilloscope to be used (7700, 7800 or 7900 series Tektronix oscilloscope) to correct power source . Turn poweron . Set vertical mode switch to left- Set horizontal mode switch to B. Set B trigger source switch to left vent . Install 7887 in B horiz compartment . Install 7000-series amplifier unit in the left vert compartment . Set 71387 triggering for P-P AUTO, with AC coupling from the internal source . Set 7887 MAG to IN and TIME/DIV switch tto 1 ms .
Maintenance---71387 7 . CHECK INDIVIDUAL COMPONENTS . The following procedures describe methods for checking individual components . Two-lead components that are soldered in place are best checked by first disconnecting one end . "this isolates the measurement from the effects of surrounding circuitry . Diodes . A diode can be checked for an open or shorted condition by measuring the resistance between terminals with an ohmmeter having a low internal source current, such as the R X 1 K scale .
Maintenance--7B87 Some parts are manufactured or selected by Tektronix, Inc . t o satisfy particular requirements, or are manufactured to specifications for Tektronix, Inc . Most of the mechanical parts used in this instrument have been manufactured by Tektronix, Inc . To determine the manufacturer of parts, first refer to parts list, then to the Cross Index---Mfr . Code Number to Manufacturer . For metal terminals (e .g ., switch terminals, potentiometers, etc .
Maintenance--7B87 COMPONENT REMOVAL AND REPLACEMENT removal or disassembly of individual components or subassemblies . Component location and circuit board locations are shown in the diagrams section . CIRCUIT" BOARDS To avoid electrical shock, disconnect the instrument from the power source before replacing components. If a circuit board is damaged beyond repair, replace the entire board assembly . Part numbers for completely wired boards are given in the Replaceable Electrical Parts list .
Maintenance-- 71387 A2-TRIGGER CIRCUIT BOARD . To remove the circuit board : A4-CLOCK CIRCUIT BOARD . To remove the circuit board : 1 . Remove 3 inter-board multi-pin connectors (see Fig . 43 for identification) . 1 . Note color of multi-pin connectors (see F ig 4-4 for identification) and P numbers to which each attach . Disconnect all multi-pin connectors from board . 2 . Remove 2 screws from circuit board . 3 .
Maintenance-788°7 INTER-BOARD MULTI-PIN CONNECTORS 2788-62 Figure 4-9 . Location of securing screws and inter-board multi-pin connectors on clock circuit board . 3 . Install gray plastic rear panel with 4 securing screws . 4 . Replace TIME/DIV knob on shaft . Align knob index with 2 ms position ; then, tighten 2 set screws on knob . 5 . Replace VARIABLE knob and tighten set screw . CAM SWITCHES . Cam switches consist of a rotating cam that mates with contacts on the adjacent circuit board .
Maintenance---7887 Remove Trigger circuit board as follows : a . Remove the 3 inter-board multi-pin connectors . b . Remove 2 screws from circuit board . c . Lift rear of board away from frame and slide toward rear of instrument. d . Note wire color of single-conductor shielded cables and connector to which each attach . Then, disconnect cables . 3 . Remove the TIME/DIV and VARIABLE (CAL IN) knobs as follows : a . Set the TIME/DIV switch to the 2 ms position and the VARIABLE (CAL IN) to expose set screw .
Maintenance----7'11387" 6-INCH STEEL RULE (OR EQUIVALENT) CD Make sure that all switch shafts are in the OUT position to clear the rear clip . Place the long edge of a six-inch rule or similar thin straight edge between the top edge of the rear clip and the switch body . Carefully pry the rear clap back just far enough to push the steel rule down between the clip and switch body . CAUTION When the switch is removed, the contacts may drop free and be damaged or lost.
Maintenance---71387 PUSHBUTTON SWITCHES . Removal and replacement instructions for pushbutton switches are shown in Figure 4-11 . SEMICONDUCTORS To avoid component damage, power must be turned off before removing or replacing semiconductors . Semiconductors should not be replaced unless actually defective . If semiconductors are removed during routine maintenance, return them to their original sockets . Unnecessary replacement of semiconductors may affect the adjustment of this instrument .
Maintenance-7887 Then (using Soldering Techniques given earlier in this section), unsolder the damaged pin and pull it from the board with a pair of pliers, leaving the ferrule (see Fig . 412) in the hole, if possible . If the ferrule remains in the circuit board, remove the spare ferrule from the replacement pin and press the new pin into the hole in the circuit board . If the ferrule is removed with the damaged pin, clean out the hole, using a solder-removing wick and a scribe .
Section 5----71387 This section contains information necessary to perform a complete instrument performance check and adjustment . Limits given in the procedure are adjustment guides and should not be interpreted as performance requirements unless preceeded by a check mark J . Where possible, instrument performance is checked before an adjustment is made .
Performance Check and Adjustment--7887 TABLE 5-1 Test Equipment Description Minimum Specifications Purpose Examples of Applicable Test Equipment 1 . Oscilloscope -` Mainframe ektronix 7000-series ; bandwidth, 400 MHz with 2 horizontal plugin compartments . Provides a display for unit under test . a . TEKTRONIX 7854 Oscilloscope system . 2. Amplifier Plugin Units Tektronix 7A-series; bandwidth, 400 MHz; deflection factor, 10 mV to 0.5 V. Provides vertical input to oscilloscope mainframe . a .
Performance Check and Adjustment-711387 TABLE 5-1 (CONT) Toot Equipment Minimum Specifications 14 . Coaxial Cables <2 required) Purpose Exump!ou of Apn!inab!o Test Equipment a. TEKTRON!x Did 5O1 Digital Multimeter, with power module . Ranges, 200 K and 2IVID; accuracy, within 1% . Special readout encoding check. Compatible with frequency ooumorboing used (see item 5, frequency counter) . Provides signal connection from frequency Counto,. a. TEKTRONIX P6028 probe . Tektronix 7000-series extender .
Performance Check and Adjustment--71387 INDEX TO PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE A. TRIGGERING SYSTEM 1 . Adjust DC Balance and Slope Balance (R85,R80) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J 2. Check Triggering Modes . . . . . . . . . . . . . . . V 3. Check External Level Range . . . . . . . . . . . 4. Adjust Trigger Sensitivity (R49) . . . . . . . . J 5 . Check External Triggering Sensitivity . . . J 6. Check Internal Triggering Sensitivity . . . J 7 .
Performance Check and Adjustment--7B87 Equipment Required : (Refer to Table 5-1, Test Equipment .) 1 . Oscilloscope mainframe. 7 . 50-ohm cables (2). 2. Amplifier plug-in units. 8. BNC T connector. 3. Low-frequency sine-wave generator. 9. 2X attenuator . 4. Medium-frequency signal generator . 10 . 10X attenuator . 5 . High-frequency signal generator. 6. Plug-in extender . BEFORE YOU BEGIN, see in the Diagrams section. CONTROL SETTINGS e. Check for a stable display with TRIG'D light on .
Performance Check and Adjustment 711387 V d. CHECK---Set the TRIGGERING LEVEL control for a stable display (TRIG'D light on). J e. CHECK---For a free-running display with TRIG'D light off when the TRIGGERING LEVEL control is set fully clockwise and fully counterclockwise . f. Set the TRIGGERING MODE to NORM . J g. CHECK---Set the TRIGGERING LEVEL control for a stable display (TRIG'D light on). J h .
Performance Check and Adjustment----713$7 J d. CHECK---Change the TRIGGERING SLOPE to (-) and repeat part c. e. Set the TRIGGERING MODE to P-P AUTO and COUPLING to AC . f. Set the amplifier unit deflection factor for 0.1 volt/division and the low-frequency sine-wave generator for a 5-division display (500 millivolts) at 50 hertz. J g. CHECK---For a stable display (TRIG'D light on) at all settings of the LEVEL control with COUPLING set to : 1 . AC 2. DC J h . CHECK---Set the SLOPE to (+) and repeat part g .
Performance Check and Adjustment----7887 c. Set the low-frequency sine-wave generator and the amplifier unit deflection factor for a 0.3-division display at 30 hertz. d. Set TRIGGERING for (+) SLOPE, NORM MODE, AC COUPLING, INT SOURCE, and set the LEVEL control for a stable display (TRIG'D light on) . J e. CHECK---Set the TRIGGERING MODE to AUTO and check for a stable display (TRIG'D light on) with the COUPLING switch set to : 1 . AC 2 . AC HFREJ 3. DC (Set TRIGGERING LEVEL control as necessary.) J f.
Performance Check and Adjustment---71387 V A°7. CHECK INTERNAL TRIGGER JITTER a. Set TRIGGERING COUPLING to AC and set the LEVEL control for a stable display (TRIG'D light on). ,/ b. CHECK---For a stable display with no more than 0.1 division (0 .1 nanosecond) of jitter . ,/ A8 . CHECK LINE TRIGGERING a . Remove all signal connections . b. Set the TRIGGERING SOURCE to LINE, the TIME/DIV switch to 1 ms, and the MAG switch to X1 . V c.
Performance Check and Adjustment----7887 HORIZON Equipment Required : (Refer to Table 5-1, Test Equipment.) 1 . Oscilloscope mainframe. 8 . Digital multimeter . 2. Test oscilloscope . 9 . Plug-in extender . 3. Amplifier plug-in units. 10 . 1 X probe. 4. Time-base plug-in unit . 11 . 50-ohm cables (2). 5 . Time-mark generator. 12 . 50-ohm termination . 6 . Frequency counter. 7 . Pulse generator. BEFORE YOU BEGIN, see "x lN Ez ; i in the Diagrams section . c.
Performance Check and Adjustment---71387 J B3 . CHECK/ADJUST MAGNIFIER GAIN AND REGISTRATION (R430,R445) a. Set the time-mark generator for 0.1-millisecond markers. b. Set the MAG switch to X10 and set the POSITION controls to midrange . Set the mainframe intensity controls for the desired display . c . Check for 1 marker/division over the center 8 divisions of display (position as necessary) . d. ADJUST---13430 (Mag Gain) for 1 marker/division over the center 8 divisions of display. e.
Performance Check and Adjustment--"71387 V. e. CHECK--That the repetition rate is 2.048 kHz, within the limits of 2 .045 to 2.050 kHz. V B7 . CHECK EXTERNAL CLOCK INPUT a. Set the AQS CLOCK/AQR switch to EXT/AQR. b. Connect a +5 volt (0 to peak), 10 MHz signal from the pulse generator to the 71387 EXT CLOCK IN connector. The frequency counter probe and ground lead must remain on TP673 and TP644. k. INTERACTION--Repeat parts b through j until the intensified zone is on the 2nd (0.
Performance Check and Adjustment---71387 1310 . ADJUST 10 /is AND 10 TIMING (R710, 13715) s SWEEP g. Set the time mark generator for 10 ms markers. h . Set the TIME/DIV switch to 10 ms, the delayed time base sweep rate to 50 ps/div, and the oscilloscope mainframe horizontal mode to chop . NOTE The 50 ns timing has been previously checked or adjusted in step B5. i. Rotate the ACQUIRE-STOP DELAY control to display a channel 2 readout of approximately 9.
Performance Check and Adjustment---7887 b . Set the time-mark generator for 10 ps markers . Set the TIME/DIV switch to 10 ps and the companion time-base unit for a 0 .1 /is/division sweep rate (unmagnified) . c . Position the display for 1 marker/division over the center 8 divisions of intensified display . d . Position the start of the delayed sweep to the left graticule edge .
Performance Check and Adjustment-71387 TABLE 5-6 Magnified Sweep Timing Tolerance (+-150 to 35 0 C) Within 0.32 div Within 0.2 div Within 0 .2 div Within 0 .2 div Within 0.2 div Within 0.2 div Within 0 .2 div Within 0.2 div Within 0.2 div Within 0.2 div Within 0.2 div v B14. CHECK SPECIAL READOUT ENCODING a. Remove the 71387 from the oscilloscope mainframe . b. Set the AQS CLOCK/AQR switch to INTERNAL . c. Connect the digital multimeter between pins A29 and B37 on the plug-in rear interface connector.
Section 6---7887 No options were available for this instrument at the time of this printing . Information on any subsequent options may be found in the CHANGE INFORMATION section in the back of this manual .
Section 7--7887 PARTS ORDERING INFORMATION Replacement parts are available from or through your local Tektronix, Inc. Field Office or representative . Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department .
Replaceable Electrical Farts - 7887 Mfr . Code, 00853 01121 01295 02111 02114 02735 03508 04222 CROSS INDEX MFR . Manufacturer___, - Address City,- State, Z_ ~Code.~_..
Replaceable Electrical Parts - 713®7 Tektronix C9 . . .,_-mpanent, No------Part No . - Serial/Assembly No . EffectiveDscont A4 REV AUG 1985 Mfr .
Replaceable Electrical Parts - 71387 Mfr . Code Mfr . 281-0786-00 281-0772-00 283-06'72-00 283-0555-00 285-0683-00 CKT BOARD ASSY :INTERFACE (REPLACEABLE AS A UNIT WITH 672-0829-XX) CAP,IXO,CER OI :150PF,10%,100V CAP,FXO,CER 01 :4700PF,10%,100V CAP,FXO,MICA DI :200PF,1X,500V CAP,FXO,MICA OI :2000PF,1X,500V CAP,FXO,PLASTIC :0 .
Replaceable Electrical Parts - 71387 Comnponent No, Tektronix Serial/Assembly No . Part No,__. ffecbye Oscont Name 8 Description -~. p, . Mfr . Cocie-,Mfr . ParNo.
Replaceable Electrical Parts - 71387 Serial/Assembly No . Tektronix Com N..a . ._. ..._._. Effective Dscont _ .._ ...._ .. .onent ...m~.No .--._ Part .-o _._ . AIQ578 151-0190-00 151-0301-00 Name 8 Descri tion .__.- .._.,. ~_. ._ . Mfr . Code Mfr . Part No . TR4NSISTOR :NPN,SI,TO-92 TR4NSISTOR :PNP,S1,TO-18 RES,FXD,CMPSN :8 .2K OHM,5%,0 .25H RES,FXO,CMPSN :10 OHM,5%,0 .25M RES,FXD,CMPSN :910 OHM,SX,0 .25M 80009 04713 19701 19701 57668 151-0190-00 ST898 5043CX8K200J RES,FXD,CNPSN :22K OHN,5X,0 .
Replaceable Electrical Parts - 71387 Component No . A1R335 A1R336 AlR337 Tektronix Serial/Assembly No . Fart No, _ Effective .-Dscont Name DescriRtion & Mfr . RES,FXD,CMPSN :47 OHM,5%,0 .25M RES,FXD,CMPSN :100 OHM,5X,0 .25H A1R338 A1R339 A1R341 315-0470-00 315-0101-00 315-0272-00 315-0120-00 315-0470-00 321-0260-00 RES,FXD,CNPSN :2 .7K OHM,5%,0 .25H RES,FXD,CNPSN :12 OHM,5%,0 .25H RES,FXD,CMPSN :47 OHM,5%,0 .25H RES,FXD,FILM :4 .99K OHM,1X,0 .
Replaceable Electrical Parts - 7887 Tektronix Component No ._Part No Serial/Assembly No, Effective Dscont __Namem& Description- Mfr . Code Mfr . Part No . 19701 57668 19701 57668 57668 19701 5043RO2K100F NTR25J-F220E 5033ED4K990F NTR25J-E330E NTR25J-E220E 5033ED4K990F CEA09090OF AlR459 AlR514 AIR518 AIR522 41R524 AIR526 322-0224-00 315-0221-00 315-0221-00 321-0260-00 RES,FXD,FILM :2 .10K OHM,1X,0 .25H,TC=TO RES,FXD,CMPSN :220 OHM,5%,0 .25H RES,FXD,FILM :4 .99K OHM,1X,0 .
Replaceable Electrical Parts - 71387 Component, No. Tektronix -P-qtNo . , A1U416 A1U722 A1U842 A1VR314 41VR728 AIM 156-0067-02 156-1149-00 156-0067-02 152-0168-00 152-0226-00 131-0566-00 MICROCKT,LINEAR :OPNL AMPL,SELECTED MICROCKT,LINEAR :OPERATIONAL AMP,JFET INPUT MICROCKT,LINEAR :OPNL AMPL,SELECTED SEMICOND DVC,01 :ZEN,S1,12V,5X,0 .4M,DO-7638 SEMICOND DVC,DI :ZEN,SI,5 .1V,5%,0 .4M,DO-7 BUS,COND :DUMMY RES,0 .094 00 X 0 .
Replaceable Electrical Parts - 71387 Tektronix Comdponent No . _ Part Serial/Assembly No . Effective_ Dscont _ Name,8,. Description__ Mfr . Code _Mfr . _Part No . A2 A2C3 A2C5 A2C7 AM A2C12 670-4181-01 290-0748-00 290-0748-00 290-0748-00 290-0534-00 281-0661-00 CIRCUIT BO ASSY :TRISGER CAP,FXO,ELCTL1 :10UF,+50-10%,25V CAP,FXD,ELCTLT :10UF,+50-10%,25V CAP,FXD,ELCTLT :10UF,+50-10%,25V CAP,FXD,ELCTLT :IUF,20%,35V CAP,FXD,CER OI :0 .8PF,+/-0 .
Replaceable Electrical Parts - Component No, . A2R12 A2R13 Tektronix - Part No Serial/Assembly No . Effective ~-Dscont- - NameDes 88 - cry i n 315-0915-00 317-0470-00 315-0105-00 315-0824-00 315-0274-00 315-0274-00 RES,FXD,CMPSN :9 .1M CHM,5X,0 .25H RES,FXD,CMPSN :47 OIAi,5%,0 .125H RES,FXD,CMPSN :IM OHM,5X,0 .25N RES,FXD,CMPSN :820K OHM,5%,0 .25N A2R20 A2R21 A2R22 A2R23 A2R29 A2R30 315-0103-00 A2R31 A2R32 A2R33 A2R34 71387 Mfr . 01121 01121 CB9155 BB4705 RES,FXD,CMPSN :270K OHM,5%,0 .
Replaceable Electrical Parts - 71381 Co Tektronix Serial/Assembly No . vent_ Nos Part No . - Etfective ,Dscon Name 8 . Description_ Mfr, Code . _Mfrs_Part _No ._ ,_ A2R93 A2R94 A2R95 A2R96 A2R97 An10 321-0260-00 321-0202-00 315-0470-00 315-0470-00 315-0221-00 263-0010-01 RES,FXO,FILM :4 .99K OHM,1%,0 .125W,TC=TO RES,FXD,FILM :1 .24K OHM,1%,0 .125W,TC=TO RES,FXD,CMPSN :47 OHM,5%,0 .25W RES,FXO,CMPSN :47 OHM,5%,0 .25W RES,FXO,CMPSN :22O OHM,5%,0 .25W SWITCH P8 ASSY :1 PUSH,7 .
Replaceable Electrical Parts - 713187 Tektronix Com onent_,No . _Part, No. ._,- Serial/Assembly No . Effective Dscont -_Name&_"i estion Mfr .
Replaceable Electrical Parts - 7E387 Component No . Tektronix Part No . _ Serial/Assembly No . Effective _Dscont .,_ 44 A4 A4C535 A4C536 A4C540 44C541 670-6184-00 670-6184-01 281-0775-00 283-0211-00 281-0775-00 281-0775-00 6010100 6023315 A4C547 285-0809-00 281-0762-00 281-0775-00 281-0773-00 283-0691-00 281-0775-00 A4C552 A4C556 94C559 94C583 A4C622 94C625 44C626 44C627 A4C631 8023314 8010100 8023314 8010121 8010100 8010100 8010120 6010120 Name 8 Description Mfr . Code -- Mfr . Part _No .
Replaceable Electrical Parts - 71387 Tektronix Component No ;_. Part _No A4R523 A4R529 WHO A4R531 A4R532 A4R533 315-0101-00 315-0102-00 311-1560-00 Serial/Assembly No . Effective ,_ Dscont _, . _ Name & Description Mfr . Code_ Mfr. , Part No. . 321-0340-00 315°-0511-00 315-0512-00 RES,FXD,CMPSN :100 OHM,57,0 .25H RES,FXD,CMPSN :1K OHM,5%,0 .25H RES,VAR,NONNN :TRMR,5K OHM,0 .5N RES,FXD,FIL14 :34 .OK OHM,17,0 .125N,TC=TO RES,FXD,CMPSN :510 OHM,5X,0 .25M RES,FXD,CMPSN :5 .1K OHM,5%,0 .
Replaceable Electrical Parts - 7Ei87 Component Nq -. a Tektronix Part No . Serial/Assembly No . ffective ,Dscont m __ a ____ ,_Name 8 Description-, Mfr . Code . Part No . Mfr E3B1025 5043CX51ROOJ NTR25JEOIKO NTR25J-E 2K 5043CXIOKOOJ 5043CX15KOOJ 40672 40673 A4R677 40678 A4R680 A4R681 301-0102-00 315-0510-00 315-0102-00 315-0202-00 315-0103-00 315-0153°-00 RES,FXO,CMPSN :IK OHM,5X,0 .50H RES,FXD,CMPSN :51 OHM,SX,0 .25N RES,FXD,CMPSN :IK OHM,5%,0 .25H RES,FXD,CMPSN :2K OHM,S%,0 .
Replaceable Electrical Parts - 78187 Tektronix Serial/Assembly No . Comeonent No -Part,No. Effective Dscont C211 Name&Descr,Description 0215 C330 0331 C332 C334 283-0672-00 290-0523-00 281-0166-00 283-0633-00 295-0172-00 295-0172-00 CAP,FXO,MICA D1 :200PF,1%,500V CAP,FXD,ELCTLT :2 .2UF,20%,20V CAP,V4R,AIR 01 :1 .9-15 .7 PF,250V CAP,FXO,MICA D1 :77PF,1%,100V CAP SET,MATCHED :O .1UF,10UF,898PF,MATCHED CAP SET,MATCHED :0 .
Symbols and Reference Designators Electrical components shown on the diagrams are in the following units unless noted otherwise : Capacitors = Values one or greater are in picofarads (pF) . Values less than one are in microfarads (pF) . Ohms (S2) . Resistors = Graphic symbols and class designation letters are based on ANSI Standard Y32 .2-1975 . Logic symbology is based on ANSI Y32 .14-1973 in terms of positive logic .
Maintenance-- 7B87 DUAL L- SIGNAL DIODE ._-J LIGHT EMITTING DIODE (L .E .D .) METAL CASE TRANSISTORS NOTE LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY VARY DUE TO VENDOR CHANGES OR INSTRUMENT MODIFICATIONS . E G B D PLASTIC CASE TRANSISTORS ._ , PLASTIC CASE .. FETE ,~ DUAL METAL CASE FET 10 INTEGRATED CIRCUITS Figure 8-1 . Semiconductor Lead Configurations .
Section 8 ---7587 A1 INTERFACE Shown on dings 1,2,3.4.5 .6 .7 & 8 A4 CLOCK Shown on dings 1,3,5,6 & 7 A3 READOUT Shown on drags . 1, 4 & 7 A2 TRIGGER Shown on dings 1 & 2 2 788 75 Figure 8-2. Locations of circuit boards in the 7(387.
/T ~~_ s ~~ ~~ ~
18-zoo V SEP 1981 FROM' PANEL DISTRIBUTION O
A 0 C E D S50 :FRONT S20 BACK F R97 R90 R91 C85 R61 u R93 R94 R1 ROO R44 R62 C88 R96 088 R89 C89 092 85 C5 R53 C9 U55 R52 R65 C69 R69 C66 s U6 939 R92 A 022 8 fl20 CR23 CR24 R22 _ C76 U35 C12 R12 R21 C21 R67 C75 CR15 R76 R13 C73 C35 R35 R14 C14 C22 R19 C34 R13 J16 R49 U75 fl36 R31 C31 C67 048 R74 C71 LR37 R41 ~' R4B R83 C72 m 315 C20 J12 R57 1870 C74 R86 R9 8 A84 R43 R72 CR71 C68 S10 R15 5 R56 R50 R59 R58 P60 CR 55 R54 R68 C51 R8 C30 R30
C3 C5 C7 C9 C12 C14 C15 C20 C21 C22 C23 C30 C34 C35 C37 C43 C46 C51 C52 C53 C56 C57 C66 C67 C68 C69 C71 C72 C73 C74 C75 C'76 C84 C85 C88 C89 5E 4E 5E 4A 4B 5C 2B 5B 5B 5C 4C 4B 5D 4D 4C 2C 3C 3B 2B 2B 2C 2C 3C 4C 4C 3B 3D 3D 4D 3D 4D 4D 2D 2D 1E 2E CKT rt NO GRID COORD CKT NO GRID COO RD CKl' NO GRID COORD C92 2E CR23 CR24 CR53 CR55 CR71 CR75 4B 4B 2C 38 3D 4D J12 J15 J16 J200 J300 J400 5B 4C 5C 1E 2C 5D LR3 LR5 LR7 LR70 LR 75 5D 5E 5E 3C 4D P60 3B Q22 Q48 Q88 Q92 Q96 Q98 4B 2E 2E 2E 1E 1
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 71387 installed in the B HORIZ compartment and controls set as follows . TIME /DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAX, X1 (button in), HOLD OFF, fully counterclockwise ; SWP CAL, midranged ; POSITION, midranged; TRIGGERING : LEVEL, midranged ; MODE, P-P AUTO ; COUPLING, AC ; SOURCE, LINE ; SLOPE, + ; ACQUIRE STOP DELAY, counterclockwise . Voltage Conditions .
7481 2788-201 REV SEP 1981
-15V u 65 PARTIAL $20 COUPLINf _~.. "O HP ¢EJ T SLOGE BAL EV 507E SELECTOR ANO TRIygER CIENERATOP. Q99 I cot ISO I J200 1 _.__._ .......__i 241 6.511, .
7B87 8106 0573 Rt03 CR314 Pt 8345 834! R 346 R3 l7 TP10 P3 P2 Q344 m. ~c C$40 J5 I TP345 ~~ C810 R426 R" 21 8441 CON 18120 T35 Q346 Q421 8440 0440 R459 0130 8454 18130 9! W4 W5 ,Q451 __ ._ I Rl37 Rl31 / ._ .
R713 P820 R706 R7u 712 ilea PRO J206 R832 352 (1356 8350 C353 R314 R353 R72t R354 CR356 R711 CR711 24R326 R24 1331 C324 R315 (13u R313 R339 8335 ca3u R323 :321 R25 0]24 CRM R721 8729 CR727 CR324 R731 ^ ~ °r J0330 J\ 8641 R842 R216 R209 Re17 0210 R213 8215 C730 iP644 s m C336 0204 J300 R204 R207 n10 8358 CR206 R206 0358 (1206 U220 s s 8271 03f2 x W1 C213 C212 J600 (1242 CR2ae R202 C356 8231 CR362 a C99 R99 R241 a 3c R243 1112" 8240 8242 CR225 R224 R88 N z
CKT NO GRID COORD CKI NO GRID COORD CKT NO C99 C204 C211 C212 C213 C214 C215 C221 C222 C225 C228 C273 C312 C324 C330 C331 C332 C333 C334 C335 C336 C353 C356 C416 C432 C440 C441 C522 C523 C526 C573 C576 C02 C730 C731 C810 C820 C822 C830 C840 C844 C4206 C4301 CR202 CR206 CR208 CR224 CR225 CR226 CR273 CR301 CR302 CR314 CR323 CR324 CR334 CR344 CR356 CR362 CR372 CR423 CR433 CR435 CR526 CR567 CR578 CR579 CR717 CR718 CR723 C R724 3.
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 71387 installed in the B HORIZ compartment and controls set as follows : TIME ; DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAG, X1 (button in) ; HOLD OFF, fully counterclockwise ; SWP CAL, midranged ; POSITION, midranged ; TRIGGERING : LEVEL, midranged ; MODE, P-P AUTO ; COUPLING, AC ; SOURCE, LINE ; SLOPE, + ; ACOUIRESTOP DELAY, counterclockwise Voltage Conditions .
_5_nrv~LE SWEEP_ T T Bt5 IAIS PARTIAL TOIFROM J200-2,9 I AUTO ENABLE SENSE f,ATE 0230 , IG1 RESET START - -~-y a222~ 1C222 4 .1V T.0047 0 MF 3 DELAY MODE CED 5230 _ _TMP-PE ~ 51NyLE SWP RESET NORM R231 Oak T aly D T -(p,' '~ UyHT ~READYI LIIHT +15V '-. _ .-. .. . -ISV 2788-202 7687 REV OCTI°.
PAItTIAL 5230 5CE ALSO msvCT .
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown weir obtained with the 7B87 installed to tIic , B HORIZ compartment and controls set as follows TIME DIV, 1 ms . VARIABLE (CAL IN), knob in, MAG, X1 (button in), HOLD OFF . fully counterclockwise ; SWP CAL, midranged, POSITION, midranged . TRIGGERING LEVEL, midranged, MODE P -P AUTO, COUPLING, AC, SOURCE, LINE, SLOPE, -, ACQUIRESTOP DELAY . counterclockwise . Voltage Conditions .
L~4SWP_ 4705 leak " ASV TSI F "OM P y O -ISY -15~ 78 al 2788-203 REV SEP 1981 F4 17 R4
2788-203 REV 5EP 1991 SWEEP GENERATOR
7B87 R530 ~ to NN ¢ ¢G U U547 U621 U636 R660 U654 C633 P68 LR631 R692 R607 CR678 CR691 R688 R689 CR695 R695 0691 TP645 J700 TP673 R608 C634 Q663 C631 C663 R663 R672 0695 R673 R694 T0644 R621 R622 R623 R624 8611 U660 o 0667 0671 0678 CR677 R668 C668 R671 R667 R669 R678 R677 TP636 TP627 U652 U Ik U638 C547 U U622 N w U U535 , R538 U637 R550 R646 C655 R606 C552 CR547 8537 R539 R548 R549 R551 R536 R531 ~}. CR552X 8552 VR552R546 ,;%.
k 1 -547 U U547 C552 CR547 R537 R539 R548 R549 R551 R536 R531 C R 552 R552 V R 552 R546 R547 U535 C535 8533 P530 R532 R544 R545 Q552 0545 0531 R541 C541 R540 C540 R538 8550 Q680 0681 0687 J500 R646 CR554 CR555 P555 R556 CR679 CR680 R680 R642 C642 R647 R645 U623 R643 Q642 0643 J641 R649 R648 R644 CR641 CR640 R641 C641 eau 0613 TP643 CKT NO GRID COORD C535 C536' C540 C541 C547 C552' C556 C559 C583 C622 C625' C626 C627' C631 C632 C633 C634 C641 C642 C643 C655 C660 C661 C663 C668 1H 2F 2H 2H 2
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 71387 installed in the B HORIZ compartment and controls set as follows : TIME/DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAG X1 (button in) ; HOLD OFF, fully counterclockwise; SWP CAL, midranged, POSITION, midranged, TRIGGERING LEVEL, midranged ; MODE, AUTO, COUPLING, AC, SOURCE, EXT; SLOPE, + : EXT TRIG IN, IN (1 Mfg) ; ACQUIRE-STOP DELAY, counterclockwise . Voltage Conditions.
a15V R518 4.99k FROM R608 RS28 4.ggk +SV t15V R526 4 .99k 5z CRS26 Q528 +ISV -1^ IS,u F 7 +10526 ti~ J Q518 ;R527 '9 .Ogk 7 Q5229 SWEEP RAMP FROM Q3384~ C522 .0022 R569 22k R514 220 R522 330 C573 Q522A INSI PARTIAL A4 CLOCK BOARD LF351 R537 54 .9k T!I : ET"f-I_L"Z_T_L-1:11"51.T": :1w.F"TSIKII".IZ :I"LL~LC_LT.lwi"I~~ N2wN-N - ~OONN_ N N-NNO .__.._ ...5_., . . .__n .._..,._ms_~_.... .._ .._ ..r.~.,. ._... ms ~s Il~ [~ .
DELAY MODE CONTROL OUT +15V DELAY MODE_ OUT m TO CR679 J500 I I q " 5V J100 DELAY 3,>---. TO R687,R688© a5V x R648 82 ~ ~ 6._ 1 INT=1000 _GATE ~AQS CLOCK/AQR PARTIAL 5645 .L4 EXT/AQR) (SEE©) * R649 DELAY GATE i15V TYPE -ISV LM301 LF351 150V ^4 -15V CURRENT 8 _._ OUT . .. v~ P32 .1 1 l'9 I SI ..,~ R591 100 754 ._.
~LU~"~sr~T"z"~~r_ ~zczzz~rrw r 16 ---~ 2 I +SV 6066 IOk I 4 I 5S R606A 2zI0k 35-___.~ s - sv G R606E 6 U621 A 74500 +SV R611 Ik 5VR'O'D U623D 13, . 74 L5132 IOk U6221: 74L5001~ x 11 6 _ U622A TIME /DIV SHOWN IN ImS POSITION ~INDICA"rF.S SWITCHCLOSEO PARTIAL 5435 _IN : x_I OUT:' K) 74L5132 R621 8622 To US90-p]O 47k 5 s TO 0590_I5V0kII -- . ___ .___R623 8624 471, 20k .48M"4 20 FROM 5205 I0 TP627 -ISv R646 6 U621B 74500 R626 m '7'27 . ._.
P_33 +50V LR II7 _--.-wCE.-.m_aISV 2.. I .ISV P3 10 F~ L632 1 41 ._ .~~(.4 .m,-."--I_.t._. j.,._..._ . .m._t5V c633 C a10,F 5x0.1 CJ LR634 1 .1 u H Coj4 .~ F -ISV ~a..--.-ISV "5V 1 .r TYPE "SV 74500 m -74L500 74L590 74LS9 74L5132 74150 74LSIS1 74L5390 ~ ~ POWER FROM I 1 b 14 5 7 14 24 10 10 7 12 8 B Ib 16 ©Static Sensitive Devices See Maintenance Sect- F15V .15V CLOCK TP673 Q671 R673 R664 562 8668 2.87k I J700 pU% SWEEP 6ATE " R672 I.Ok -ISV 0668 0.
A a ~oem~ais~~^ U U U U r~ sic^"'r~" . U U a sr°.' oc~ ¢ m^ocw~srmsm~ tis~s ¢ U U U U Figure 8-6. A3-Readout circuit board assembly.
board assembly . CKT NO GRID COORD R757 R761 R763 R764 R771 R772 R773 R779 R781 R782 R783 R784 R785 R786 R787 R791 R792 R793 R794 1C 1F 1H 1F 1D 1D 1D 2D 1C 1D 1D 1C 1A 1A 1C 1E 1E 1E 1E S725 5800 1G 1C I SEP 1981 2788-16 A4 CLOCK Shown on diags 1, 3.5,6 & 7 A1 INTERFACE Shown on diags . 1,2.3,4,5.6 .7.
9763 13 k T5 9 TS I Ts a TS S TS 9 531 ~°-...~-._.~. ®.de.~ 1 633(I A32 , 1 A10;°--°-~ _.w., .. PI P21 IF -1 ...Y ._y,~.._. .( i IYI o 's 91 1 1.2,5 ;11 m. fI 6 829 ' 1 I . ;lob ."'° I 1 E"°"°"".'®'° 6, S m5 n5 5800 PARTIAL AI INTrkr^I-E so*RO SHOWN IN 1°M-6 POS. ]INDICATED SWITCH CLOSE 7887 7.
m -+ ob c -1 5800 TIME /DIY I N 1 N 17x.4 POs .
38 <- COLUMN ANALOCA DATA FROM P2-2 5O 1 36 < 1 35 < 1 34 < 33 1 r TS4 32
a8I i TO CR226, 5230 °-" 16 ® SINC;LE 5W EEP RESET ! 14 Is FROM ri5 ~--~ I 1 . ___ ._. ._.__........._. .~.,._..__..>j, I I NC II ----> IO FROM R5T8 9 '9O gZOI -,*-) S .4> 1 TO PS-2 © --> ' I - SIGNAL X-Y COMPENSATION DELAY GATE SWEEP LOCKOUT MAIN FRAME CHANNEL. SWITCH SI4NAL (DISPLAY 6) 6 FROM J70©2 FROM aI R2'15 -0--> 4 II FROM QS76, J500-I TO U220-I3 I NTERFACE AUX SWEEP GATE © HOLD OFF 3 II _~ I b 1 OUT .
R305 DELAY START R445 MAG REG R430 MAG GAIN \ R710 10 Ns TIMING R715 10 ms TIMING C330 50 ns TIMING R80 SLOPE BAL Figure 8-7 .
7B87 R538 SCALING TP673 oint and Adjustment Locations .
Section 9-7B87 PARTS ORDERING INFORMATION INDENTATION SYSTEM Replacement parts are available from or through your local Tektronix. Inc. Field Office or representative . This mechanical parts list is indented to indicate item relationships. Following is an example of the indentation system used in the description column .
Replaceable Mechanical Parts - 7B87 Mfr . Code, 01536 07707 08261 09922 22526 22599 24546 27238 71159 73743 74445 77900 78189 79136 80009 83385 83486 85471 87308 93907 TKO507 CROSS INDEX --- MFR . Manufacturer____., .
Replaceable Mechanical Parts - 7887 Fig . 8 Index No 1-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 Tektronix Part_- No 337-1064-04 337-1064-12 366-1391-02 213-0075--00 366-1077-00 213-0246-00 366-1319-02 213-0075-00 426-0681-00 366°1189-00 213-0246-00 366-1023-01 213-0246-00 366-1166-00 213-0246-00 366-1103-00 213-0153-00 426-1072-00 366-1058-79 Serial/Assembly No . Effective__Dscont 8010100 8022300 8022299 8010100 8021476 8021475 ,_QQty. .,_.
Replaceable Mechanical Parts - 7B87 Fig, & Index Tektronix No . Part No . Serial/Assembly No . Effective. Dscont _Qom.
Replaceable Mechanical Parts - 7138'% Fig . 8 Index Tektronix Serial/Assembly No . Mfr . No . .__ .__, ._Part_-No_:Effective . .. ...._Dscont_ ._. -.-Qtr.--- .?2.345, . ..--._Name ._$. _DescriptionCodeMfr .__... ... . Part No .
Replaceable Mechanical Parts - 7887 Fig . & Index Tektronix No ., Part dNo, 1-124 -125 -126 Serial/Assembly No .
Replaceable Mechanical Parts - 71387 Fig . 8 Index Tektronix Serial/Assembly No . . Part_ No . _.-,..--, Effective _ Dscont No, 1352-0163-06 352-0169-00 -168 352-0161-00 352-0161-05 352-0161-07 -169 352-0162-00 352-0162-04 Qtv T 1 2 1 1 1 1 1 12345 Name 8Description HLOR,TERN .HL)R,TERM HLOR,TERM HLOR,TERN HLOR,TERM .HU)R,TERK .HLf)R,TERN CONN :5 COiN :2 CONN :3 CONN :3 CONN :3 CONN :4 CONN :4 HIRE,BLUE KIRE,BLACK HIRE,BLACK WIRE,GREEN HIRE,VIOLET HIRE,BLACK HIRE,YELLOH Mtr .
u 01 m Lei WASOF 51 s P e, r IT MOM 9 13 5l 98 Ill~y®' v "zo -,19 O O &M20 - Lal
--- 61 7B87 TIME BASE
MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested . Sometimes, due to printing and shipping requirements, we can't get these changes immediately into printed manuals. Hence, your manual may contain new change information on following pages. A single change may affect several sections .
COMMITTED TO EXCEtLErvce M NUAL CHANGE INFORMATION Date : .._..___2/10/1986___ Product:_ 7887 Time Base Change Reference: ., .,_.. ..__M57812 Manual Part No .: - DESCRIPTION 070-22788800 Manual Insert for Product Group 42 These changes are effective at serial number 8023665. RS LAC CT ICAL PARTS LIST CHANGES CHANGE TO : A1 ----- ----- CKT BOARD ASSY :INTERFACE (REPLACEABLE AS A UNIT WITH 672-0829-02) A1 R227 315-0201-00 RES .,FXD,FILM :200 OHM,5%,0 .
