Tektronix 442 Instruction Manual Download Page 169

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Produce

442 SERVICE_________________ Date:

4- 2~ 81

Change Reference:

M43083

D E S C R I P T I O N

appears, then repeat steps 1 and 2. If intensity modulation is now eliminated,

permanently install the new value of R463. If intensity modulation is noted,

install the next higher nominal value for R463, repeat steps 1 and 2, and if

intensity modulation is now OK, permanently install the latest R463 value.

6. If the Step 2 check is OK, repeat steps 3 and 4. If Step 4 check is also OK

the selection process is completed. If the Step 4 check is unsatisfactory,

proceed to Step 7.

7. To select R469, reduce its value (to the next lower nominal value) in steps

while repeating Steps 3 and 4 until satisfactory results are obtained. Repeat

Steps 1 through 7 as necessary.

REPLACEABLE ELECTRICAL PARTS & SCHEMATIC CHANGES

CHANGE TO:

R463

SELECTED (NOMINAL VALUE 910Kfi)

R469

SELECTED (NOMINAL VALUE lOMfi)

R463 and R469 are located on the A1 INTERFACE board and are shown on

VERTICAL OUTPUT, CRT & PROBE ADJ diagram 3.

Page

o f

Summary of Contents for 442

Page 1: ...SE BY QUALIFIED PERSONNEL ONLY TO AVOID PERSONAL INJURY DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO INSTRUCTION MANUAL Tektronix Inc P O Box 500 Beaverton Oregon 97077 Serial Number 070 2374 01 First Printing AUG 1977 ...

Page 2: ...mage resulting from improper use or from connecting the product to incompatible equipment c if personnel other than Tektronix representatives modify the hardware or software There is no implied warranty of fitness for a particular purpose Tektronix is not liable for consequential damages Copyright igZTi f 980 Tektronix Inc All rights reserved Contents ofthis publication may not be reproduced in an...

Page 3: ...ERT OUTPUT AMPL CRT PROBE ADJ 3 5 TRIGGER 3 6 SWEEP AND HORIZONTAL AMPLIFIER 3 8 HORIZONTAL OUTPUT AMPLIFIER 3 9 POWER SUPPLY 3 9 Page Section 4 CALIBRATION PROCEDURE 4 1 GENERAL 4 1 Introduction 4 1 Test Equipment Required 4 1 PERFORMANCE CHECK 4 3 Introduction 4 3 Preliminary Procedure 4 4 Procedure 4 5 ADJUSTMENT PROCEDURE 4 12 Introduction 4 12 Preliminary Procedure 4 14 A DISPLAY AND POWER SU...

Page 4: ...binet removal 4 13 4 6 Moving Interface board to adjustment access position 4 15 4 7 Low voltage power supply adjustment location 4 17 Fig No Page 4 8 Interface board adjustment locations board shown in access position 4 18 4 9 Vertical attenuator preamplifier delay line driver and CH 2dc trigger level adjustment locations 4 21 4 10 Display of correct idealized attenuator compensation 4 21 4 11 Ho...

Page 5: ...zontal Output circuit board 7 9A All Trigger Switch circuit board component locations component locations for SN B021532 and 7 14 Horizontal Output board location up 7 15 A2 Power Supply circuit board 7 9B All Trigger Switch circuit board component locations component locations for SN below 7 16 Power Supply board location B021532 7 17 442 Oscilloscope troubleshooting chart 7 10 Trigger Switch cir...

Page 6: ...ctor Identification 2 1 2 2 Ac Regulating Ranges 2 2 2 3 Power Input Fuse Values 2 2 3 1 Attenuator and Gain SwitchingSequence3 3 4 1 Test Equipment Required 4 1 4 2 Vertical Deflection Accuracy 4 5 4 3 Sweep Rate Timing Accuracy 4 10 5 1 Power Supply Tolerance 5 8 5 2 Relative Susceptibility to StaticDischarge Damage 5 13 5 3 Maintenance Aids 5 23 iv REV A MAY 1980 ...

Page 7: ...ord is essential for safe operation Grounding the Product This product is grounded through the grounding conduc tor of the power cord To avoid electrical shock plug the power cord into a properly wired receptacle before connecting to the product input or output terminals A protective ground connection by way of the grounding conductor in the power cord is essential for safe opera tion Danger Arisi...

Page 8: ...tages exist at several points in this product To avoid personal injury do not touch exposed connec tions and components while power is on Disconnect power before removing protective panels soldering or replacing components Power Source This product is intended to operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor...

Page 9: ...442 Service 442 Oscilloscope viii REV A MAY 1980 ...

Page 10: ... od of about 20 minutes The adjustment procedure in Section 4 when performed completely allows the 442 to meet the electrical specification listed in Table 1 1 Table 1 1 ELECTRICAL CHARACTERISTICS Characteristics Performance Requirements Supplemental Information VERTICAL SYSTEM Deflection Factor Calibrated Range 2 mV to 10 V div 12 steps in a 1 2 5 sequence Accuracy 20 C to 30 C Within 3 Gain adju...

Page 11: ...5 sec div Accuracy 20 C to 30 C Sweep accuracy applies over the center 8 divisions Exclude the first 50 ns of sweep for both magnified and unmagnified sweep rates as well as anything beyond the 100th magnified division Unmagnified Within 3 Magnified Within 5 15 C to 55 C Unmagnified Within 4 Magnified Within 6 X10 Magnifier Extends fastest sweep rate to 10 ns div 10 1 in X10 position with button p...

Page 12: ...quirements are approxi mately ten times the values listed for EXT DC CPLG AUTO NORM 0 5 div internal or 100 mV external from dc to 2 MHz increasing to 1 5 div internal or 150 mV external at 35 MHz TV Sync Composite sync 1 div internal or 100 mV external Composite video approximately 2 3 div internal or 230 mV external External Trigger Input EXT EXT 10 Maximum Input Voltage 400 V dc peak ac 800 V p...

Page 13: ...Nominal Anode Voltage Approximately 10 kV POWER SOURCE Line Voltage Ranges ac 120 V 240 V HI LO switches are accessible externally 120 V Range HI 110 to 132 V rms LO 92 to 110 V rms 240 V Range HI 220 to 250 V rms LO 202 to 242 V rms Line Frequency 48 to 62 Hz Power Consumption 36 watts max 0 35 amps max at 120 V 60 Hz Table 1 2 ENVIRONMENTAL CHARACTERISTICS Characteristics Description Temperature...

Page 14: ...s each direction for a total of 12 shocks Table 1 3 PHYSICAL CHARACTERISTICS Characteristics Description Weight With Panel Cover Accessories and Accessories Pouch 22 5 pounds 10 1 kilograms Without Panel Cover Accessories and Accessory Pouch 18 0 pounds 8 1 kilograms Domestic Shipping Weight 28 5 pounds 12 95 kilograms Dimensions Refer to Figure 1 1 ACCESSORIES NOTE Refer to the Accessories tab pa...

Page 15: ...Specification 442 Service FRONT VIEW 5 60 INCHES 14 22 cm 11 25 INCHES 28 57 cm 12 95 INCHES 32 89 cm 2 3 7 4 2 A Figure 1 1 442 Oscilloscope dimensions 1 6 REV A MAY 1980 ...

Page 16: ...used Refer to the Safety Summary in the front of this manual for power source grounding and other safety con siderations pertaining to use of the instrument Before connecting the instrument to a power source verify that the Line Voltage Selector switch and the Regulating Range Selector switch are both set for the line voltage being used that the proper line fuse is installed and that the line cord...

Page 17: ...110 to 132 V rms 220 to 250 V rms LO 92 to 110 V rms 202 to 240 V rms Fuse Information The 442 power input fuse is located in a fuse holder on the back panel of the 442 See Figure 2 3 Figure 2 1 Commonly used power plugs Set the AC Line Voltage Selection syvitchtothe nominal line voltage available see Table 2 2 The fuse value must be changed when a different Line Voltage range is selected see Tabl...

Page 18: ...trol fully clockwise Crt Display and Power Front Panel See Figure 2 4 ASTIGmatism Recessed screwdriver control used in conjunc tion with the FOCUS control to obtain a well defined display It does not require readjustment during normal operation of the 442 T INTENSITY Turn control clockwise to increase display brightness Set for lowest visible display to prolong crt life T FOCUS Provides adjustment...

Page 19: ...of Power Input Selector switches verify that the 442 power cord is unplugged from the power source and that the correct value of fuse is installed for the available power input voltage see Table 2 3 and Figures 2 3 and 2 6 120 V 240 V Ac Power Input Selector Switch Two position screwdriver actuated slide switch which can be set to allow operation from an ac source of either 120 V or 240 V Position...

Page 20: ...Note for X Y operation l AC GND DC Input coupling switches tor Channel 1 and Channel 2 Three position lever switches that select the method of internally coupling the vertical input signals to the vertical amplifier input Yf VOLTS DIV Channel 1 and Channel 2 Switchesthat select the vertical defIection factors in a 1 2 5 sequence The item 18 VAR controls must be in the calibrated detent position to...

Page 21: ...Channel 1 and Channel 2 signals at the end of each sweep If SOURCE is set to CH1 CH2 the channel 1 signal will provide the triggering signal unless CH 2 and ALT buttons are latched in then Channel 2 will provide the triggering signal CHOP Display switches from Channel 1 signal to Channel 2 signal at a rate of ap proximately 250 kHz If SOURCEswitch is set to CH1 CH2 the Channel 1 signal will provid...

Page 22: ...t connector item 28 EXT 10 Trigger signals applied to the external trigger input connector are attenuated by a factor of ten before being applied to the trigger circuitry X Y This position permits X Y displays if the CH 2 VERT MODE button is latched in During X Y operation X deflection is obtained from the signal applied to the channel 1input connector and Ydeflec tion is obtained from the signal ...

Page 23: ...ircuit 33 HOLD OFF A control that permits varying the amount of hold off time between sweeps Provides stable triggering on low repetition rate pulses or aperiodic signals To obtain the best display set or adjust all other triggering controls before adjusting the HOLD OFF control For normal operation set this control fully counterclockwise Hold off increases to MAXimum as the control is rotated ful...

Page 24: ...d adjust TRIGGERING con trols for a triggered display Adjust the probe compensa tion for a flat top waveform see Figure 2 10 Refer to the appropriate probe data sheet or manual for the specific method for compensating the probe in use ri I j 4 A I PROPERLY r COMPENSATED J WAVEFORM J 1 1 1 1 j COMPENSATED V J 1 9 4 2 5 2 3 7 4 6 8 Figure 2 10 Probe compensation Vertical Gain Check Obtain a display ...

Page 25: ...e channel selected 3 Set the VOLTS DIV switch to display about 5 divisions of waveform amplitude 4 Set the Triggering controls to obtain a stable triggered display Set the SEC DIV switch to a position that displays several cycles of the waveform 4 Adjust the Channel 1 VOLTS DIV switch to obtain the desired display amplitude while adjusting the Channel 1 POSITION control to locate the display withi...

Page 26: ...line can be checked at anytime by switching the AC GND DC switch to the GND position Figure 2 12 Measuring peak to peak voltage of a waveform Instantaneous Voltage Measurements Dc To measure the dc level at a given point on awaveform use the following procedure 1 Connect the test signal to either the Channel 1 or Channel 2 input connector 2 Set the VERT MODE switches to display the selected channe...

Page 27: ...r amplitude comparison measurements 3 To establish an arbitrary vertical deflection factor so the unknown amplitude of a signal can be measured accurately at any setting of the VOLTS DIV switch the amplitude of the reference signal must be known If it is not known it can be measured before the VAR control is set in step 2 2 Do not apply signals that exceed the equivalent of about eight times the r...

Page 28: ...lliseconds and a SEC DIV switch setting of 2 m with the VAR control adjusted to provide a horizontal deflection of eight divisions Substitutingthese values in the horizontal conversion factor formula step 4 Horizontal Conversion Factor 2 19 milliseconds 2X8 1 37 Then with a SEC DIV switch setting of 50 fj the unknown period of asignal which completes one cyclein 7 horizontal divisions can be deter...

Page 29: ...veform as described in the previous application 2 Calculate the reciprocal of the time duration to determine the frequency EXAMPLE The frequency of the signal shown in Figure 2 14 which has a time duration of 0 5 millisecond is calculated as follows Frequency time duration 0 5 ms 0 5X104 Using the formula horizontal SEC DIV Time Duration distance X settjng divisions Substitute given values Time Du...

Page 30: ...y time 4 4 Set the VOLTS DIV switches to produce 4 or 5 divisions of display amplitude 5 Set the LEVEL control for a stable display 6 If possible set the SEC DIV switch for a sweep rate which shows three or more divisions between the measurement points for the two waveforms 7 Set the vertical POSITION controls to center each waveform or points on the display between which the measurement is made i...

Page 31: ...h to a sweep rate which displays about one full cycle of each waveform over 10 graticule divisions The phase difference is 27 Figure 2 17 Measuring phase difference 7 Use the Channel 1 and Channel 2 POSITION controls to center the waveforms around the center horizontal graticule line 8 Turn the SEC DIV VAR control until one cycle of reference signal Channel 1 occupies exactly 8 divisions between t...

Page 32: ...ble along with the signal display a special oscilloscope camera such as the TEKTRONIX C5C or C5C Option 3 is recommended These cameras provide an external flash illumination for the crt graticule Effectiveness of the external flash illumination is somewhat degraded when used with the blue crt light filter A clear light filter is available as an optional accessory for the 442 refer to the Accessori...

Page 33: ...on and instrument allowing three inches on all sides 4 Seal carton with shipping tape or industrial stapler Required Reshipment Information If the instrument is to be shipped to aTektronix Service Center for service or repair attach a tag containing the following information 1 Owner s name and address with the name of an individual at your firm who can be contacted 2 Complete instrument serial num...

Page 34: ...d a Diode Gate The Diode Gates are controlled by the Vertical Switching circuit as determined by the Vertical Mode switch to select the channel s for display An output from the Vertical Switching circuit is connected through the Chop Blanking Pulse Generator tothe Z Axis Amplifier to blank switching transients in the CHOP mode A sync pulse from the sweep via the Alternate Sync Pulse Amplifier swit...

Page 35: ...e probes POWER SUPPLY The Power Supply circuits provide low voltage power necessary for operation of the instrument DETAILED CIRCUIT DESCRIPTION The operation of circuits unique to this instrument is described in detail in this discussion Circuits commonly used in the electronics industry are not described in detail The following circuit analysis gives names of individual stages and describes how ...

Page 36: ...uency losses in the preamplifier VAR control R4152 provides uncalibrated deflection factors between VOLTS DIV switch settings by attenuating signals applied to the base of Q4158 Transistors Q4174 Q4184 and associated circuitry compose a common base amplifier stage Second Cascode Amplifier Transistors Q4176 Q4186 and Q4344 Q4346 on diagram 2 compose the second cascode amplifier Capacitors C4177 and...

Page 37: ...ne driver The setting of the SEC DIV switch should be considered when selection of ALT or CHOP mode is made CHOP should be used with sweep speeds of 1 ms and slower and ALT should be used with sweep speeds of 5 ms and faster In the chopped mode pin 2 of U4306A is ungrounded by the Vertical Mode push button switching allowing the multivibrator U4306A and U4306D to free run at about 250 kHz The outp...

Page 38: ...lay intensity level by changing the dc voltage level at the junction of R462 C463 and C464 Crt Circuit High Voltage Oscillator Transistor Q458 and associated circuitry make up the high voltage oscillator that produces the drivefor high voltage transformer T460 When the instrument is turned on current through Q454 provides forward bias for Q458 Transistor Q458 conducts and the collector current inc...

Page 39: ... to ground Crt Control Circuits Crt display focus is controlled by FOCUS control R468 ASTIG adjustment R477 which is used in conjunction with the FOCUS control to provide a well defined display varies the voltage on the astigmatism grid Geometry adjustment R473 varies the voltage on the horizontal deflection plate shields to control the overall geometry of the display Two adjustments control the t...

Page 40: ... Y signals proceed through regular CH 2 circuits The SOURCE switch also connects 8 volts to R2182to forward bias CR2183 providing a current tothe horizontal amplifier to center the crt display 8 volts is also applied to CR2182 and R2185 to electrically piacethe sweep in the NORM mode and to disable the trigger circuit during X Y operation MODE Switch MODE switch S2150 selects three triggering mode...

Page 41: ... circuitry Resistors R2154 and R2178 determine the sensitivity When the MODE switch S2150 is in AUTO or NORM 8 volts is applied to R2156 which causes pin 1of U2156Ato go HI enabling Schmitt trigger U2156A U2156B At the same time pins 12 and 13 of U2156D are also HI disabling Schmitt trigger U2156C U2156B A Trigger signal from Q2152 triggers Schmitt trigger U2156A U2156B to produce a logic trigger ...

Page 42: ...e gain of the paraphase amplifier When the current through the collector of Q2334 increases the current through the collector of Q2344 decreases and is 180 out of phase with the current at the collector of Q2334 The resulting signal to the crt deflection plates is a push pull signal Diode CR2334 prevents Q2334 from saturating when R2322 is in the X10 position Since Q2334 is a shuntfeedback amplifi...

Page 43: ...onsisting of 0774 and 0776 Current limiting circuits provide short circuit protection for each regulated supply The following describes the 8 volt current limiting circuit The other current limiting circuits operate similarly In the 8 volt supply Q752 is normally biased off Under normal conditions the base of Q752 is set at about 8 V As the supply current increases the voltage drop across R754 inc...

Page 44: ...4 1 TEST EQUIPMENT REQUIRED Description Minimum Specification Usage Examples 1 Amplitude Calibrator Amplitude accuracy within 0 25 signal amplitude 10 mV to 10 V output signal 1 kHz square wave Vertical deflection accuracy checks X Axis deflection check vertical gain adjustment a TEKTRONIX PG 506 Calibration Generator 3 2 Digital Voltmeter Range 0 to 9 V dc voltage accuracy within 0 3 display 4 1 ...

Page 45: ...0028 00 9 Adapter Probe tip to bnc Vertical attenuator compensation a Tektronix Part No 013 0084 02 10 Alignment Tool Low capacitance Variable capacitor adjustment vertical attenuator and high frequency compensation adjustments a General Cement adjustment tool GC 8722 11 Attenuator Ratio 10X impedance 50 H connectors bnc Signal attenuation a Tektronix Part No 011 0059 02 12 Cable 3 required Impeda...

Page 46: ... the Performance Requirement column of the tables in Specification Section 1 Line Voltage Selection Refer to the Preliminary Procedure preceding the Performance Check steps for instructions on setting the 442 for the available power input source voltage Test Equipment All equipment is assumed to be calibrated and operating within the original specifications The tolerances given in this performance...

Page 47: ...e specified for the new Selector setting Refer to the Operating Instruc tions section of this manual for complete operating voltage and fuse information Unless otherwise specified the 442 is originally set for 120 V and HI line operation 2 Connect the 442 power cord plug tothe line voltage source and press the ON OFF button on in The POWER ON LED should light NOTE The 442 must have a warmup time o...

Page 48: ...o center the display within the graticule area b CHECK Channel 1 deflection accuracy for the settings listed in Table 4 2 within 3 20 C to 30 C Adjust INTENSITY and all POSITION controls as re quired For best results in Steps 1 and 2 leavethe LEVEL control fully clockwise for a free running display c Set Amplitude Calibrator Output 10 mV 442 AC GND DC CH 1 AC GND DC CH 2 VERT MODE POSITION CH 2 GN...

Page 49: ...C VERT MODEf CHI VOLTS DIV CH 1 CH 2 10 m IX POSITION all As required SEC DIV 1 m j Connect a 50 kHz Leveled Sine wave Generator signal through a 50 Q precision cable a 50 Qtermination and a Dual Input Coupler to the Channel 1and Channel 2 input connectors c CHECK Distance between the two dots is 5 divisions 5 4 75 to 5 25 divisions k Set the generator amplitude to provide a 5 division display d D...

Page 50: ...ination Sine wave Generator signal from the Channel 1input connectortothe Channel 2 input connector c Set the generator frequency to 50 kHz reference frequency and set the generator output amplitudefora5 division display d Set the generator frequency to 35 MHz c Set the generator frequency to 50 kHz reference frequency and set the generator output amplitude for 5 divisions of horizontal deflection...

Page 51: ...and VOLTS DIV VAR control to provide a 0 5 division display Readjust the LEVEL control as required to maintain astable triggered display in the remainder of Step 10 through Step 13 d CHECK A stable display can be obtained for the 5 division signal with SLOPE in both out and in positions and with MODE in both AUTO and NORM settings e Set MODE to NORM and adjust LEVEL for a triggered display e CHECK...

Page 52: ...ternal Triggering 35 MHz Check a Set SOURCE EXT b CHECK That astable display can be obtained with SLOPE in both out and in positions and with MODE in both AUTO and NORM settings c CHECK That a stable display can be obtained with CPLG set to DC and AC positions b Remove the 50 0 termination and connect the adapter directly to the T Connector Set the generator frequency to 50 kHz and output amplitud...

Page 53: ...DIV TRIGGERING MODE SOURCE 1 20 p AUTO CH 1 CH 2 Vertically position the display so the baseline is off screen at the bottom of the graticule area and read the tips of the time markers at their intersection with the center horizontal graticule line Table 4 3 b Connect the test equipment as shown in Figure 4 3 with 50 Q termination and set the sine wave generator for a 5 division 50 kHz display c D...

Page 54: ...URCE set to CH 1 CH 2 or COMP set the VOLTS DIV and VOLTS DIV VAR to attenuate the TV signal to one division of composite sync or 2 3 divisions of composite video on the crt display W A R N I N G If a television receiver is used as the signal source an isolation transformer must be installed between the receiver and its power input source if the receiver does not have atransformer operated power s...

Page 55: ... voltage Internal Adjustments and Adjustment Interaction Do not preset the internal controls or change the 8 volt supply adjustment setting as this will typically necessitate a complete recalibration of the instrument when only a partial recalibration might otherwise be necessary To avoid unnecessary recalibration change internal control settings only when a Performance Characteristic is not met w...

Page 56: ...mple in the Test Equipment list is not available first check the Minimum Specifications column carefully to see if any other equipment might suffice Then check the Usage column to see the purpose of this item If used for a check that is of little or no importance to your measurement requirements the item and corresponding steps can be deleted W A R N I N G I I Dangerous potentials exist at several...

Page 57: ...board holders described in Step 2 check that cables and wires from the board are clear of other components while the board is being changed from one position to the other and that no interconnecting plugs or pin connectors have loosened during the transi tion If the Vertical section is to be recalibrated install a shield see Table 4 1 over the foil side of the Interface board as follows 1 Place th...

Page 58: ...A C E B O A R D IN N O R M A L O P E R A T IN G P O S IT IO N REMOVE FOCUS iNTENSi f K M O B S H A P T A SSEM B LIES H im F R O N T PANEL OPENINGS AND REINSTALL O N P C U L N IIO M E T ER SH A FTS IN T E R F A C E B O A R D P L A C ED IN A D J U S T M E N T A C C E S S P O S IT IO N Figure 4 6 Moving Interface board to adjustment access position REV A MAY 1980 4 15 ...

Page 59: ...GGERING MODE to AUTO and SOURCE to CH 1 CH 2 4 Set CPLG to AC out and leave it there throughout the procedure unless instructed otherwise 5 Set the following 442 controls as listed VERT MODE CH 1 POSITION CH 1 CH 2 Midrange VOLTS DIV CH 1 CH 2 2 m IX VOLTS DIV VAR CH 1 CH 2 Detent fully cw AC GND DC CH 1 GND AC GND DC CH 2 DC SEC DIV 1 m MAGNIFIER XI out POSITION Horizontal Midrange SLOPE out HOLD...

Page 60: ...X VOLTS DIV VAR CH 1 CH 2 Fully cw detent AC GND DC CH 1 CH 2 GND c Disconnect the digital voltmeter leads from the 442 POSITION all Midrange SEC DIV 1 m SEC DIV VAR Fully cw detent MAGNIFIER XI out SOURCE CH 1 CH 2 TRIGGERING MODE AUTO SLOPE out CPLG AC out LEVEL Fully cw HOLD OFF Fully ccw INTENSITY Forvisibledisplay fuses 742 Set all other controls as desired The 442should display a baseline tr...

Page 61: ... and d Set the Horizontal POSITION control as required c Set the channel 1VOLTS DIV VAR and POSITION controls to obtain a display of slightly more than 8 divisions of vertical deflection with the baseline about 1 division below the bottom of the graticule area and the tips of the time markers extending to the top graticule line d Set the SEC DIV switch to display time markers spaced about 1 divisi...

Page 62: ...cule area NOTE Verify that the Calibration Fixture Shield has been installed as described under Preparation in the Introduction portion of this Adjustment Procedure If only a partial Adjustment procedure is to be performed refer to Introduction and Preliminary Procedure at the beginning of this Adjustment Procedure to prepare the 442 for adjustment PR O C ED U R E 1 Vertical Preamplifier Balance a...

Page 63: ... connectors d ADJUST R126 Gain for a centered vertical dis play amplitude of 4 8 divisions set Channel 1 POSITION as necessary to maintain a vertically centered display e ADJUST R4151 CH 1 Gain for a 5 division centered vertical display amplitude set Channel 1 POSITION as required g Connect a 10X probe to the CH 1 input connector Connect the probe tip to a probe tip to bnc adapter the adapter to a...

Page 64: ...or Set the generator to 1 kHz and set the generator amplitude to provide a 5 division display c ADJUST C4214 see Figure 4 9 for the best squarefront corner on the displayed waveform see Figure 4 10 for example d Set CH 2VOLTS DIVto 2 IX and setthe generator amplitude to provide a 5 division display e ADJUST C4205 see Figure 4 9 for the best square front corner see Figure 4 10 for example Disconnec...

Page 65: ... Set VOLTS DIV CH 1 CH 2 VERT MODE SEC DIV INTENSITY LEVEL 2 m IX CH 1 5 m For a visible display For a triggered display b Connect the square wave generator fast rise transition output through a 50 D cable a 10X attenuator and a 50 Qtermination to the Channel 1input connector c Set the generator for a 100 kHz 5 division display set INTENSITY and POSITION controls for a visible centered display d S...

Page 66: ...d POSITION controls as required to maintain a well defined medium intensity display withinthe graticule area PROCEDURE 1 Horizontal Gain XI Gain a Connect the time mark generator signal through a 50 D bnc cable to a 50 Q termination at the CH 1 input connector Set the generator for 1 millisecond time markers b If necessary set the Channel 1VOLTS DIV and VAR controls to provide a display of slightl...

Page 67: ... Disconnect the time mark generator signal fromthe 442 5 X Axis Centering X Y Centering a Set SOURCE CPLG SEC DIV VERT MODE INTENSITY CH 1 CH 2 AC 1 m CH 2 For visible trace b Set the Horizontal POSITION control so the sweep starts at the extreme left graticule line Set SOURCEto X Y and reduce INTENSITY setting so the displayed dot is visible but not excessively bright c Set the Horizontal POSITIO...

Page 68: ...ify that Vertical Preamplifier Balance fsee B VERTICAL AMPLIFIER Step 1 is correctly adjusted before commencing the following Triggering ad justments If only apartial procedure is to be performed refer to Introduction and Preliminary Procedure at the beginning of this Adjustment Procedure to prepare the 442 for adjustment a Set the 442 front panel controls as follows INTENSITY For a visible displa...

Page 69: ...EST E Q U IP M E N T REQ UIRED Description M inim um Specification Usage Examples 1 Amplitude Calibrator Amplitude accuracy within 0 25 signal amplitude 10 mV to 10 V output signal 1 kHz square wave Vertical deflection accuracy checks X Axis deflection check vertical gain adjustment a TEKTRONIX PG 506 Calibration Generator 3 2 Digital Voltmeter Range 0 to 9 V dc voltage accuracy within 0 3 display...

Page 70: ...e four Phillips head rear foot securing screws Loosen the screw that secures the accessory pouch to the rear cabinet frame and detach the accessory pouch 3 Remove the rear cabinet frame and slidethe cabinet up off the back of the 442 4 To re install the cabinet and accessory pouch reverse the order of the foregoing steps Moving Interface Board to Access Position The Interface board can be moved to...

Page 71: ...at dissipation It also provides an electrical conduction path that can result in instrument failure especially under high humidity conditions The best way to clean the interior is to blow off the accumulated dust with dry low pressure air approximately 9 pounds per square inch Remove any remaining dirt with asoft brush or a cloth dampened with a mild detergent and water solution A cotton tipped ap...

Page 72: ... Si PHILLIPS INTERFACE BOARD IN NORMAL OPERATING POSITION REMOVE FOCUS INTENSITY KNOB SHAFT ASSEMBLIES FROM FRONT PANEL OPENINGS AND REINSTALL ON POTENTIOMETER SHAFTS INTERFACE BOARD PLACED IN ADJUSTMENT ACCESS POSITION REV A MAY 1980 5 3 Figure 5 2 Moving Interface board to access position ...

Page 73: ...ion to aid in locatingthe defective component An understanding of the circuit operation is helpful in locating troubles particularly where integrated circuits are used Seethe Theory of Operation Section 3 for this information Troubleshooting Aids DIAGRAMS Complete circuit diagrams are given on foldout pages in the Diagrams section The portions of the circuit mounted on circuit boards are enclosed ...

Page 74: ... FIGURES RESISTORS Q CAPACITORS pF DIPPED TANTALUM VOLTAGE RATING MULTIPLIER TOLERANCE MULTIPLIER TOLERANCE over 10 pF under 10 pF BLACK 0 1 1 2 0 2 p F 4 V D C B R O W N 1 10 1 10 1 0 1 pF 6 V D C RED 2 10 or 100 2 10 or 100 2 10 V D C O R A N G E 3 10 or 1 K 3 10 or 1000 3 15 V D C YELLO W 4 104 or 10 K 4 10J or 10 000 1 0 0 9 20 V D C G R EE N 5 10s or 100 K 1 2 10 or 100 000 5 0 5 pF 25 V D C ...

Page 75: ...Maintenance 442 Service E TRANSISTORS INTEGRATED CIRCUITS 2 3 7 4 2 0 A 5 6 REV A MAY 1980 Figure 5 4 Semiconductor lead configuration ...

Page 76: ...trade name at the pin 1end and pin 1may or may not be marked on the circuit board In some applications the jack or plug number may be marked on the board near the pin 1 end Troubleshooting Equipment Refer to Table 5 3 at the end of this section for a list of suggested equipment to use for troubleshooting the 442 0 99 5 1 1 2 3 7 4 2 1 A Figure 5 5 Multi pin connector holder indexing Troubleshootin...

Page 77: ... SUPPLY TOLERANCE Supply Tolerance 8 V Set within 0 5 8 V Within 3 100 V Within 5 Semiconductors Agood check of transistor operation is actual performance under operating conditions A transistor can be most effectively checked by substituting a new component for it or one which has been checked previously However be sure that circuit conditions are not such that a replacement transistor might also...

Page 78: ...g one end from the circuit Refer to the Replaceable Electrical Parts list for tolerances of resistors used inthis instrument Resistors normally do not need to be replaced unless the measured value varies widely from the specified value The best check for thick film resistor networks is actual operation in the circuit Inductors Check continuity of inductors with an ohmmeter to detect an open condit...

Page 79: ...ve approximately 200 V peak to peak at pin 5 of T460 primary winding of the high voltage transformer 3 If neither the 2 kV or a 50 kHz sine wave are present check Q454 Q458 and Q446 Do not short the secondary of the high voltage transformer to ground as this could damage the transformer T460 Z Axis SYMPTOM No intensity or no control over intensity with BEAM FINDER button pressed in a Does a trace ...

Page 80: ...gering signal is not reaching the sweep circuit b Check the voltage at the junction of R2151 R2152 R2143 Does the voltage vary from 2 volts to 3 volts when the LEVEL control is rotated through its range If it does next check whether the U2156B output level varies when the LEVEL control is rotated c Connect a signal to the Channel 1 input and check for a trigger pulse at the output of U2156B If the...

Page 81: ...nsitive Components Static discharge can damage any semiconductor component in this instrument This instrument contains electrical components that are susceptible to damage from static discharge See Relative Susceptibility table for various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments Observe the following precautions to avoid damage 1 Minimize h...

Page 82: ...ronic components from a local commercial source in your area Before you purchase or order a part from a source other than Tektronix Inc please check the Replaceable Electrical Parts list for the proper value rating tolerance and description NOTE Physical size and shape of a component may affect instrument performance particularly at high fre quencies Always use direct replacement com ponents unles...

Page 83: ...d Any replacement component should be of the original type or a direct replacement Leads on the replacement component should be bent to fitthe holes inthe board and cut to the same length as the leads on the original component refer to Figure 5 4 for Semiconductor Lead Identification Handle silicone grease with care Avoid getting silicone grease in the eyes Wash hands thoroughly after use Some pla...

Page 84: ...6 1 2 3 7 4 2 2 A Figure 5 6 Pin connector re installation in multi pin holders 2 Re install the connector into the correct hole in the plug in portion of the holder Note color code on wire insulation to determine correct hole in the holder 3 Bend the slotted portion of the holder back to its original position so connectors are captivated in the holder Readjustment After Repair After any electrica...

Page 85: ...sopropyl alcohol and blow it dry with low pressure air Isopropyl alcohol flammable avoid its use near open flame or other potential sources of ignition If the above procedures don t work replacethe contact strip If cleaning the switch restores continuity check to ensure that the contact wipes acrossthe pad If the contact does not wipe replace the contact strip Contact Replacement Cam Switch contac...

Page 86: ...oten tiometer when removing the attenuator assembly RETAINER BUSHING RECESSED PORTION OF SHAFT 2 3 7 4 2 3 A Figure 5 7 Shafl knob assembly removal PHI L U PS HEAD SCREWS SLOTTED HEAD SCREW WITH CAPTIVE SPACER ON BOTTOM OF BOARD T H IR D P H IL U P S H E A D SCREW FOR CHANNEL 1 THROUGH CENTER CHASSIS A14 HORIZONTAL OUTPUT BOARD DELAY LINE DELAY l in e SCREWS PHILLIPS HEAD SCREW A6 CHANNEL 1 ATTENU...

Page 87: ...d later by following the appropriate portions of the steps under A6 and A7 Attenuator Removal Remove the Vertical board as follows 1 Use a 1 16 Allen wrench to remove all the VOLTS DIV and VOLTS DIV VAR knobs from their shafts 2 Perform steps 2 and 3 under A6 and A7 Attenuator Removal 3 Note locations for reassembly reference and disconnect all small and large connectors from the Vertical board 4 ...

Page 88: ...ws 1 Disconnect single wire connectors P2334 and P2344 from the board pins and multi pin connec tor P2332 from its board pins see Figure 5 8 2 Remove the four Philli ps head screws that secure the board to the rear crt bracket 3 To reinstall the Horizontal Output board reverse the order of the foregoing procedure Delay Line Removal Remove the Delay Line as follows 1 Remove the three Phillips head ...

Page 89: ...m the 442 To operate the 442 with the Interface board in the access position re install the FOCUS and INTENSITY shaft knob assemblies on the poten tiometer shafts If the Interface board is to be completely removed from the 442 proceed with the following steps 5 Remove the two plastic shields that cover the foil side of the Interface board two Phillips head screws in each shield Unsolder the leads ...

Page 90: ... Board SEC DIV Switch Removal The Timing board is plugged into two connectors on the A12 Horizontal board To remove the Timing board first move the Interface board to the access position see A1 Interface Board Removal then proceed as follows 1 Disconnect the Horizontal POSITIONshaft knob assembly from the potentiometer shaft and pull the assembly far enough out through the front panel opening to c...

Page 91: ... the crt shield 10 Remove the four screws that secure the rear crt bracket to the chassis near the crt base 11 Support the crt shield assembly while removing the two screws that secure the crt front support plastic mounting bracket to the inside of the 442 front panel casting These two screws are the ones closest to the bottom of the crt graticule The two screws nearest the top of the crt graticul...

Page 92: ... MO Check voltages below 1 kV and general trouble shooting Use with a High Voltage probe for voltages above 1 kV TEKTRONIX DM 502A Digital Multimetera 4 High Voltage probe Dc voltage range 1 kV to at least 3 kV Accuracy 1 Impedance and connectors to match the digital multimeter Check voltages in crt circuit in excess of 1 kV not for 10 kV anode voltage measurement which requires a non loading volt...

Page 93: ...ll contact you concerning any change 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 furth...

Page 94: ...AT MFG CO INC 14193 CAL R INC 14433 ITT SEMICONDUCTORS 15454 RODAN INDUSTRIES INC 18324 SIGNETICS CORP 19396 ILLINOIS TOOL WORKS INC PAKTRON DIV 24546 CORNING GLASS WORKS ELECTRONIC COMPONENTS DIVISION 27014 NATIONAL SEMICONDUCTOR CORP 27264 MOLEX PRODUCTS CO 32997 BOURNS INC TRIMPOT PRODUCTS DIV 50157 MIDWEST COMPONENTS INC 50437 RELIANCE STEEL PRODUCTS COMPANY 51406 MURATA CORPORATION OF AMERICA...

Page 95: ...F 200V 72982 374000C0K0129B Cl19 281 0768 00 CAP FXD CER DI 470PF 20 100V 72982 8035D9AADW5R471M C124 281 0762 00 B010100 B010408X CAP FXD CER DI 27PF 20 100V 72982 8035D9AADC0G270M C129 281 0768 00 CAP FXD CER DI 470PF 20 100V 72982 8035D9AADW5R471M C412 281 0775 00 CAP FXD CER DI 0 1UF 20 50V 72982 8005D9AABZ5U104M C423 281 0661 00 B010100 B010408X CAP FXD CER DI 0 8PF 0 1PF 500V 72982 301 OOOCO...

Page 96: ...0 4 M C 2 0 9 1 2 8 1 0 7 7 5 0 0 C A P F X D C E R D I 0 1 U F 2 0 50V 7 2 9 8 2 8 0 0 5 D 9 A A B Z 5 U 1 0 4 M C 2 0 9 2 2 9 0 0 5 1 7 0 0 C A P F X D E L C T L T 6 8 U F 2 0 35V 5 6 2 8 9 1 9 6 D 6 8 5 X 0 0 3 5 K A 1 C 2 1 2 3 2 9 0 0 5 1 7 0 0 C A P F X D E L C T L T 6 8 U F 2 0 35V 5 6 2 8 9 1 9 6 D 6 8 5 X 0 0 3 5 K A 1 C 2 1 2 4 2 8 1 0 7 7 3 0 0 C A P F X D C E R D I 0 0 1 U F 1 0 100V 7...

Page 97: ...DI 47PF 10 100V 72982 8035D9AADC1G470K C4201 281 0541 00 CAP FXD CER DI 6 8PF 10 500V 72982 301 OOOC0HO689D C4202 285 1124 00 CAP FXD PLSTC 0 022UF 20 400V 19396 PP721E223M C4204 281 0207 00 CAP VAR PLSTC 2 18PF 100V 80031 2807C00218MH02F0 C4205 281 0214 00 CAP VAR CER DI 0 5 3PF 400V 80031 2502A0R503VP02F0 C4206 283 0213 00 CAP FXD CER DI 300PF 5 100V 72982 8121N130C0G0301J C4213 281 0207 00 CAP ...

Page 98: ...52 0269 00 CR416 152 0075 00 SEMICOND DEVICE GE 25V 40MA 14433 G866 CR418 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR437 152 0061 00 SEMICOND DEVICE SILICON 175V 100MA 07263 FDH2161 CR443 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR463 152 0639 00 SEMICOND DEVICE RECT SI 10KV 10MA 80009 152 0639 00 CR465 152 0639 00 SEMICOND DEVICE RECT SI 10KV 10MA 80009 152 063...

Page 99: ...N 30V 50NA 01295 1N4152R CR4328 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR4331 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR4332 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR4335 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR4336 152 0141 02 SEMICOND DEVICE SILICON 30V 50NA 01295 1N4152R CR4346 152 0141 02 SEMICOND DEVICE SILICON 30...

Page 100: ...87 Q754 151 0302 00 TRANSISTOR SILICON NPN 07263 S038487 Q756 151 0478 00 TRANSISTOR SILICON NPN 80009 151 0478 00 Q772 151 0301 00 TRANSISTOR SILICON PNP 04713 2N2907A Q774 151 0301 00 TRANSISTOR SILICON PNP 04713 2N2907A Q776 151 0478 00 TRANSISTOR SILICON NPN 80009 151 0478 00 Q812 151 0497 00 TRANSISTOR SILICON NPN 01295 TIP47 Q2020 151 0188 00 TRANSISTOR SILICON PNP 04713 SPS6868K Q2028 151 0...

Page 101: ...ISTOR SILICON PNP 04713 SPS6866K Q4346 151 0199 00 TRANSISTOR SILICON PNP 04713 SPS6866K Q4350 151 0199 00 TRANSISTOR SILICON PNP 04713 SPS6866K Q4352 151 0199 00 TRANSISTOR SILICON PNP 04713 SPS6866K Q4354 151 0199 00 TRANSISTOR SILICON PNP 04713 SPS6866K Q4356 151 0199 00 TRANSISTOR SILICON PNP 04713 SPS6866K Q4376 151 0434 00 TRANSISTOR SILICON PNP 04713 SS7144 Q4386 151 0434 00 TRANSISTOR SILI...

Page 102: ... 1 0 2 0 0 R747 3 1 5 0 1 0 4 0 0 R 752 321 0130 00 R 753 3 2 1 0 2 3 9 0 0 R 754 3 0 8 0 7 5 5 0 0 R 756 3 2 1 0 6 7 1 0 0 RES FXD CMPSN 30K OHM 5 0 25W RES FXD FILM 100M OHM RES FXD CMPSN 2M OHM 5 0 25W RES VAR NONWIR 5M OHM 20 1W RES VAR NONWIR 2 5K OHM 20 0 50W RES VAR NONWIR 100K 0HM 20 0 5W RES VAR NONWIR 2K OHM 20 0 50W RES FXD CMPSN 150K 0HM 5 0 25W RES FXD CMPSN 33K OHM 5 0 25W RES VAR NO...

Page 103: ... 00 RES FXD FILM 1M OHM 1 0 125W 24546 NA4D1004F R2014 321 0481 00 RES FXD FILM 1M OHM 1 0 125W 24546 NA4D1004F R2021 321 0150 00 RES FXD FILM 357 OHM 1 0 125W 91637 MFF1816G357R0F R2022 321 0201 00 RES FXD FILM 1 21K OHM 1 0 125W 91637 MFF1816G12100F R2023 321 0193 00 RES FXD FILM IK OHM 1 0 125W 91637 MFF1816G10000F R2024 321 0229 00 RES FXD FILM 2 37K OHM 1 0 125W 91637 MFF1816G23700F R2025 315...

Page 104: ... 2 49K OHM 1 0 125W 91637 MFF1816G24900F R2144 315 0821 00 RES FXD CMPSN 820 OHM 5 0 25W 01121 CB8215 R2145 321 0231 00 RES FXD FILM 2 49K OHM 1 0 125W 91637 MFF1816G24900F R2146 321 0189 00 RES FXD FILM 909 OHM 1 0 125W 91637 MFF1816G909R0F R2147 315 0222 00 RES FXD CMPSN 2 2K OHM 5 0 25W 01121 CB2225 R2151 315 0102 00 RES FXD CMPSN IK OHM 5 0 25W 01121 CB1025 R2152 315 0911 00 RES FXD CMPSN 910 ...

Page 105: ...W 91637 MFF1816G806R0F R2311 321 0268 00 RES FXD FILM 6 04K OHM 1 0 125W 91637 MFF1816G60400F R2313 321 0279 00 RES FXD FILM 7 87K OHM 1 0 125W 91637 MFF1816G78700F R2314 321 0320 00 RES FXD FILM 2IK OHM 1 0 125W 91637 MFF1816G21001F R2315 321 0297 00 RES FXD FILM 12 IK OHM 1 0 125W 91637 MFF1816G12101F R2316A B 311 1974 00 RES VAR NONWIR PNL 50K 20K OHM 10 0 50W 12697 CM41730 R2317 315 0751 00 RE...

Page 106: ...ES FXD FILM 50 OHM 0 5 0 125W 91637 MFF1816G50R00D R4147 321 0030 00 RES FXD FILM 20 OHM 1 0 125W 91637 MFF1816G20R00F R4150 321 0041 00 RES FXD FILM 26 1 OHM 1 0 125W 91637 MFF1816G26R10F R4151 311 1563 00 RES VAR NONWIR IK OHM 20 0 50W 73138 91 85 0 R4152 311 1956 00 RES VAR NONWIR PNL IK OHM 10 0 50W 12697 CM41725 R4154 321 0078 00 RES FXD FILM 63 4 OHM 1 0 125W 91637 MFF1816G63R40F R4155 315 0...

Page 107: ...0 RES FXD CMPSN 10 OHM 52 0 25W 01121 CB1005 R4218 315 0151 00 RES FXD CMPSN 150 0HM 52 0 25W 01121 CB1515 R4221 321 0481 00 RES FXD FILM 1M OHM 12 0 125W 24546 NA4D1004F R4222 315 0474 00 RES FXD CMPSN 470K OHM 52 0 25W 01121 CB4745 R4224 321 0030 00 RES FXD FILM 20 OHM 12 0 125W 91637 MFF1816G20R00F R4225 321 0030 00 RES FXD FILM 20 OHM 12 0 125W 91637 MFF1816G20R00F R4227 315 0152 00 RES FXD CM...

Page 108: ...FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R4294 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R4293 315 0161 00 RES FXD CMPSN 160 0HM 5 0 25W 01121 CB1615 R4296 315 0820 00 RES FXD CMPSN 82 OHM 5 0 25W 01121 CB8205 R4298 321 0185 00 RES FXD FILM 825 OHM 1 0 125W 91637 MFF1816G825R0F R4299 321 0185 00 RES FXD FILM 825 OHM 1 0 125W 91637 MFF1816G825R0F R4301 315 0103 00 RES FXD CMPSN 1OK OHM 5...

Page 109: ...00 RES FXD CMPSN 75 OHM 52 0 25W 01121 CB7505 R4389 321 0156 00 RES FXD FILM 412 OHM 12 0 125W 91637 MFF1816G412R0F R4396 311 1563 00 RES VAR NONWIR IK OHM 20 0 50W 73138 91 85 0 R4397 311 1561 00 RES VAR NONWIR 2 5K OHM 202 0 50W 73138 91 83 0 R4398 315 0103 00 B010100 B010408 RES FXD CMPSN 10K OHM 52 0 25W 01121 CB1035 R4398 315 0203 00 B010409 RES FXD CMPSN 20K OHM 52 0 25W 01121 CB2035 R4411 3...

Page 110: ...UAL RETRIG MONOSTABLE MV 07263 9602 PC OR DC U2234 156 0180 00 MICROCIRCUIT DI QUAD 2 INPUT NAND GATE 01295 SN74SOON U4306 156 0113 00 MICROCIRCUIT DI QUAD 2 INP NAND GATE 80009 156 0113 00 U4324 156 0388 00 MICROCIRCUIT DI DUAL D TYPE FLIP FLOP 80009 156 0388 00 V470 154 0729 00 B010100 B010786 ELECTRON TUBE CRT P31 INT SCALE 80009 154 0729 00 V470 154 0804 00 B010787 ELECTRON TUBE CRT P31 80009 ...

Page 111: ...t location illustration and in the lookup table for the schematic diagram and corresponding component locator illustration The Replaceable Electrical Parts list is arranged by assemblies in numerical sequence the components are listed by component number see following illustration for constructing a component number The schematic diagram and circuit board component location illustration have grids...

Page 112: ...ns Figure 7 2 A 7 C H 2 Attenuator circuit board com ponent locations C K T NO G R ID LO C CKT N O GRID LO C C K T N O G R ID LO C C4101 2A R4104 2B R4147 5A C4102 2A R4105 2B C4104 2B R4106 3A S4100 IB C4105 2B R4107 3B S4110 3B C4106 3B R4108 3B C4113 3A R4114 3B C4114 3B R4116 4B C4115 3B R4117 4B C4116 4B R4118 4B C4143 5A R4143 5A R4144 5A R 4101f 1A R4145 5A R4102 2B R4146 5A Static Sensitiv...

Page 113: ...Figure 7 4 442 Oscilloscope block diagram REV A JUN 1980 2 3 7 4 2 7 A ...

Page 114: ... g E C E C O co in c o me 2 cog 8 2 3 S jn n R 4 3 9 7 CO CO rr rt O co co O C C OCgg C4395 R4396 co a e co co wo o O C4339 04 17 4 04184 R4182 R4172 C4268 R4268 R4281 C4168 R4168 R4267 O R4155 R4265 R4124 R4133 R4131 R4233 R4231 J4100 1 C4122 R4122 CR4122 R4125 04416 R4416 w S C4255 Q4268 Q4234 04258 04232 G4411 R4411 R4225 S o R4130 R4282 C4396 ELAY LINE ARK WIRE mm C4397 r t r r l ao coco _ g s...

Page 115: ...5E R4357 4C C4331 3H Q4268 4F R42504 5E R4358 4B C4332 4H Q4274 4D R4251 4F R4359 4B C4334 6C Q4276 5D R4254 4E R4360 6C C4339 4D Q4284 4D R4255 4E R4362 6C C4355 4B Q4286 5D R4256 4E R4368 6B C4368 6B Q4294 6E R4257 5F R4373 6C C4375 5B Q4296 6E R4258 5E R4375 5B C4378 6B Q4302 1C R4261 4E R4376 5B C4385 5B Q4344 4D R4262t 5E R4377 6C C4386 4B Q4346 4D R4265 3E R4378 5B C4388 5A Q4350 5C R4266 4E...

Page 116: ...B C4332 4H 04274 4D R4251 4F R4359 4B 0 4 334 60 Q4278 5D R4254 4E R4360 60 C4339 4D Q4284 4D R4255 4E R4362 8C 0 4 355 4B 0 4 2 8 6 5D R4256 4E R4368 SB 04368 6B Q 4294 BE R4257 5F R4373 6 0 0 4 3 75 5B 0 4 2 9 6 6E R4258 5E R4375 5B C4378 63 Q 4302 1C R4261 4E R4376 SB C 4385 5B Q4344 4D R 4262t 5E R4377 6 0 C4386 4B Q4346 4D R4265 3E R4378 5B C4388 BA Q 4350 5 0 R4266 4E R4383 4 0 04389 4B 0 4 ...

Page 117: ...A8 VERTICAL BOARD Figure 7 6 Vertical circuit board location ...

Page 118: ......

Page 119: ...lloscope Waveforms may vary as much as 20 A 50 kHz 100 mV sine wave was applied to the Channel 1 input and a 50 kHz 2 V square wave was applied to the Channel 2 input A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 pro vided the square wave 442 controls were set as follows SOURCE CH 1 CH 2 MODE AUTO SEC DIV 10 us VERT MODE CH 1 Channel 1 VOLTS DIV 50 mV AC GND DC both DC VAR both ...

Page 120: ......

Page 121: ... Q458 4A R417 3J R467 IF C l 13 IK C476 2B J421 3J Q812t 4A R419 4J R468 2G C114 IK C477 2B J477 5C R423 41 R469 IE C115 1J C478 2B R22 4K R424 4H R473 5B C l 18 2J C802 51 P24 5M R23 4L R425 4H R474 21 C119 1J C817 3B PI 38 11 R24 4L R4 6 4H R475 5B C124 IK PI 48 21 R25 4L R432 5G R476 5B C129 2J CR26 4L PI 68 2L R26 4L R433 5H R478 5B C412 2M CR27 5M P465 2E R27 5M R434 5G R802 5L C423 4H CR113 ...

Page 122: ......

Page 123: ...Figure 7 8 interface circuit board location ...

Page 124: ......

Page 125: ...s ap plied to the Channel 2 input A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave The 442 controls were set as follows SOURCE CH 1 CH 2 MODE AUTO SEC DIV 10 jus VERT MODE ALT Channel 1 VOLTS DIV 50 mV AC GND DC both DC VAR both Detent MAGNIFIER X I HOLDOFF Fully CCW Channel 2 VOLTS DIV 1 V Other controls were set as needed to obtain a stable display For wa...

Page 126: ......

Page 127: ...R2014 C2014 R2092 C2092 R2051 X Y CENTERING Figure 7 9A A ll Trigger Switch circuit board component locations for SN B022474 up A 1 B C D E F G H 1 FRONT S2030 o 2 C2030 i f t oncd O _ i g 8 S 8 Q2032B 2 2 Si2 S Si S S R2006 COMP LEVEL CCCCCCCC S O C q o o o o o atc Q2032A CM ID CM CO r i comn o cvo 2 o g C OP OC MP o Mo S See S O cv c CO Llj CO CO ft D to o 2 O P cv O CV CV r r goec CCOO CV CV S ...

Page 128: ...2061 1H S2010 3A S2030t S2050t CKT GRID NO LOC CKT GRID NO LOC CKT NO GRID LOC CKT NO GRID LOC CKT NO GRID LOC C2001 2E CR2005 ID R2006 2D R2035 2F RT2061 1H C2005 2E CR2006 ID R2007 2D R2036 IE C2010 3D CR2024 1G R2008 t R2037 2F S2010 3A C2011 3D CR2025 INSET R2010 3D R2038 2F S2030t C2013 3E CR2032 IF R2011 2D R2039 IE S2050t C2014 3E CR2036 IE R2013 3E R2048 1G C2019 2C CR2063 1G R2014 2E R204...

Page 129: ... R2001 2D R2034 2F R2005 2 D C K T G R ID NO LOG C K T G R ID N O LOG C K T NO G R ID LO C C K T N O G R ID LO C R2006 2D R2035 2F R2007 2D R2036 IE R 2008 t R2037 2F R2010 3D R2038 2F R2011 2D R2039 IE R2013 3E R2048 1G R2014 2E R2049 2G R2021 2F R2050 2G R2022 2G R2051 3H R2023 2G R2052 2H R2024 2G R2053 2H R2025 IN S E T R2055 2H R2026 IF R2057 2G R2027 2G R2060 1H R2028 1G R2061 1H R202S IN S ...

Page 130: ...A ll TRIGGER SWITCH BOARD 2 3 7 4 3 6 A Figure 7 10 Trigger Switch circuit board location ...

Page 131: ...2 3 7 4 S 4 R ev jun VRSO V E R T IC A L OUT PUT CRT t PROBE ADJ 3 ...

Page 132: ...oscilloscope input coupling was set to dc Waveforms may vary as much as 20 A 50 kHz 100 mV sine wave was applied to the Channel 1 input and a 50 kHz 2 V square wave was ap plied to the Channel 2 input A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave 442 controls were set as follows SOURCE CH 1 CH 2 MODE AUTO SEC DIV 10 ms VERT MODE CH 1 Channel 1 VOLTS DIV ...

Page 133: ......

Page 134: ... o g S S S oco 0 n j o g o o X a o 5 o o 3D3D30 30 3D303D 30 30 30 30 3D3D3D3D3D303D303D 30 30 3D303D303D30303D3D3D3D3D3D 30 30 3D3D30 30 3D30 3D303D3D 30 30 ro ro to io io io io fo io ro io to to to ro io to to to io ro to to to ro to to io to to io io ro io io io to ro ro io fo ro ro to to ro io io to lo ro ro ro io ro io io io ro ro to io ro to ro io ro io ro io ro io ro ro io ro k 1 1 1 1 i j ...

Page 135: ...234 61 Q2244 6F R2182 4B RT2310 5D C2235 6F Q2246 5G R2185 1H C2236 51 Q2274 4G R2186 1 1 S2140 21 C2245 6G Q2312 4B R2188 1H S2312 3F C2246 6G Q2314 5B R2223 4J C2252A 5F Q2326 5B R2224 4J U2156 41 C2252B 5F R2226 4H U2212 51 C2274 4G R2116 11 R2227 5H U2224 4H C2275 4G R2118 11 R2233 6H U2234 6H C2276 4G R2120t 2G R2235 5H C2278 5G R2121 1J R2236 41 VR2392 51 C2317 6B R2122 1H R2237 5H C2322 4B ...

Page 136: ...ING BOARD SEC DIV Switch BOARD Figure 7 12 Horizontal circuit board location Static Sensitive Devices See Maintenance Section See Parts List for serial number ranges flncorrect marking on some boards see R2164 ...

Page 137: ......

Page 138: ...square wave was ap plied to the Channel 2 input A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave 442 controls were set as follows SOURCE CH 1 CH 2 MODE AUTO SEC DIV 10 ms VERT MODE CH 1 Channel 1 VOLTS DIV 50 mV AC GND DC both DC VAR both Detent MAGNIFIER XI HOLDOFF Fully CCW Channel 2 VOLTS DIV 1 V Other controls were set as needed to obtain a stable displ...

Page 139: ......

Page 140: ...4 4 Z ...

Page 141: ... may vary as much as 20 A 50 kHz 100 mV sine wave was applied to the Channel 1 input and a 50 kHz 2 V square wave was applied to the Channel 2 input A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave 442 controls were set as follows SOURCE CH 1 CH 2 MODE AUTO SEC DIV 10 us VERT MODE CH 1 Channel 1 VOLTS DIV 50 mV AC GND DC DC VAR both Detent MAGNIFIER X I out...

Page 142: ......

Page 143: ...i C R 2 3 3 4 Q 33 34 P 2 3 3 4 SW P TO CRT I00V 8V e v MGF REG M I IL J V C2387 E 0 5 IL J tov IL N V si I C23R4 2 F 7 k el L l j V 8V R 2 3 3 0 20 K R2333 7SK e v R 2 3 3 4 7 5K 8 V R 2 3 4 5 3 3 0 Wv 8 V DIAG 8V R 2 3 4 2 I 5K CR23423 Q 2 3 4 4 R 2 3 4 4 4 K IOOV s R 2 3 4 7 1 T S K P 2 3 4 4 SW P TO CRT I PARTIAL AI2 HORIZONTAL BOARD Static Sensitive See Maintenance Devices Section p T l4 H O ...

Page 144: ...R2332 2C C2399t R2333 2C R2334 2C CR2334 2C R2335 2C CR2342 2B R2336 2C CR2356 2A R2337 2D R2342 2B P2332 3C R2344 2A P2334 1C R2345 2B P2344 IB R2347 1A R2352 3B Q2332 2C R2353 3B Q2334 1C R2354 3B Q2344 IB R23S5 3B Q2354 3B R2356 3B R2357 2B R2330 3C Static Sensitive Devices See Maintenance Section FIGURE 7 14 fLocated on back of board ...

Page 145: ...A14 HORIZONTAL OUTPUT BOARD 2 3 7 4 4 0 A Figure 7 14 Horizontal Output circuit board locations ...

Page 146: ...C756 2B CR758 3B Q772 2D R757 2C VR764 2C C758 3B CR764 2C Q774 5B R762 3C C762 2C CR765 2C 0776 6B R763 1C C763 1C CR766 2C R764 3D C764 2C CR767 2C R722 2F R765 3C C774 2D CR778 IE R726 2F R766 5B C778 2D R732 2F R772 2E F722 2A R733 2F R773 2D CR721 2F F742 4F R734 5G R774 2D CR722 3F F743 4F R736 2E R775 5B CR723 2E R737 2E CR724 3E P7 3B R741 3D S701 4C CR732 2F R742 3E S705 4E CR734 2F Q722 ...

Page 147: ... Voltages shown on this schematic diagram were measured with a Tektronix DM 502A Digital Multimeter Voltage measurements can vary as much as 20 No signals were applied to the vertical input or to EXT ernal trigger input ...

Page 148: ...R EV K JUN 9SO ...

Page 149: ...E S U P P L IE S O R L O A D S PRESS BEAM F IN D E R CH EC K OR ADJUST V E R T IC A L A M P L IF IE R CH EC K V E R T IC A L SW ITC H IN G D U A L TR A C E O N LY C H E C K T R IG G E R IN PU T B U FFE R T V T R IG G E R A M P L IF IE R T V SYNC SE PA R A TO R A N D T V S C H M IT T TR IG G E R CHECK H O R IZ O N T A L O U TP U T A M P L IF IE R A N D D E F L E C T IO N LEADS YES S P O T A P P E A...

Page 150: ...ust be purchased separately unless otherwise specified 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 Name identification the U S Federal Cataloging Handbook H6 1 can be utilized where possible ABBREVIATIONS INCH ELCTRN ELECTRON IN INCH SE SINGLE END NUMBER SIZE ELEC...

Page 151: ...TIONAL ELECTRONIC RESEARCH CORP PERMACEL DIV OF JOHNSON AND JOHNSON 8535 DICE ROAD 7923 SW CIRRUS DRIVE 12916 S BROADWAY P 0 BOX 3608 P 0 BOX 5012 13500 N CENTRAL EXPRESSWAY 21001 NORDHOFF STREET 5825 N TRIPP AVE 4800 PRUDENTIAL TOWER 7100 LAMPSON AVE P 0 BOX 867 1757 STANFORD ST 2021 W VALLEY VIEW LANE P 0 BOX 34829 YOUK EXPRESSWAY 30 LORRAINE AVE 1501 W SEPULVEDA BLVD P O BOX 3158 125 BEECHWOOD ...

Page 152: ...8 214 0515 02 2 HUB HDL INDEX 1 42 DIA X 0 565 THK AL CD ATTACHING PARTS 80009 214 0515 02 9 213 0139 01 2 SCREW SLFLKG 10 24 X 0 375HEX HD STL 26233 P38AS 1024 6C 10 210 1182 00 2 WSHR SPR TNSN 0 218 ID X 0 69 INCH OD 80009 210 1182 00 11 390 0593 00 B010100 B021769 1 CAB WRAPAROUND 80009 390 0593 00 390 0593 01 B021770 1 CAB WRAPAROUND 80009 390 0593 01 12 352 0263 00 1 HLDR POUCH ASSY 80009 352...

Page 153: ... 442 ...

Page 154: ...442 REV A DEC 1978 ...

Page 155: ...0 00 ATTACHING PARTS 19 211 0101 00 1 SCREW MACHINE 4 40 X 0 25 100 DE G FLH STL 83385 OBD 20 136 0052 00 1 JACK TIP 0 25 32 X 0 5 BL BANANA 83330 21478 21 1 RES VAR NONWIR SEE R477 EPL ATTACHING PARTS 22 358 0342 00 1 BSHGjMACH THD 0 25 X 32 X 0 352 INCH LONG 80009 358 0342 00 23 210 0046 00 2 WASHER LOCK 0 261 ID INTL 0 018 THK BRS 78189 1214 05 00 0541C 24 210 0471 00 1 NUT SLEEVE HEX 0 312 X 0...

Page 156: ...210 28 TERMINAL PIN 0 365 L X 0 025 PH BRZ GOLD 22526 1 CONN RCPT ELEC FD THRU 10 MALE TINPLATED 27264 2 CONN RCPT ELEC FD THRU 12 MALE GOLD PLATED 27264 1 RES VAR NONWIR SEE R412 EPL 1 RES VAR NONWIR SEE R468 EPL SWITCH PUSH SEE S410 EPL 2 SPACER PUSH SW PLASTIC 80009 1 SWITCH PUSH SEE S700 EPL 4 HEAT SINK ELEC 0 25 ID X 0 75 INCH LONG 98978 1 WIRE SET ELEC 80009 1 BRACKET ANGLE CKT BOARD ALUMINU...

Page 157: ... CONN RCPT ELEC FD THRU 12 MALE GOLD PLATED 27264 09 70 1129 101 2 SWITCH PUSH SEE S2312 S2140 EPL 102 361 0542 00 4 SPACER SWITCH PLASTIC 71590 J 64281 103 1 RES VAR NONWIR SEE R2138 EPL 104 1 RES VAR NONWIR SEE R2316 105 1 RES VARjNONWIR SEE R2269 EPL 106 337 2500 00 1 SHIELD ELEC CIRCUIT CARD 80009 337 2500 00 107 255 0427 00 2 PLASTIC FILM 000EF OBD ATTACHING PARTS 108 211 0008 00 2 SCREW MACH...

Page 158: ... LT CRT BLUE 4 319 X 3 531 X 0 06 80009 378 0678 01 141 407 2031 00 1 BRACKET CR T T O P STEEL 80009 407 2031 00 ATTACHING PARTS 142 211 0007 00 2 SCREW MACHINE 4 40 X 0 188 INCH PNH STL 83385 OBD 143 407 2028 00 1 BRACKET CR T BOTTOM STEEL 80009 407 2028 00 ATTACHING PARTS 144 211 0507 00 4 SCREW MACHINE 6 32 X 0 312 INCH PNH STL 83385 OBD 145 214 2300 00 1 CONTACT ELEC GROUNDING BRS 80009 214 23...

Page 159: ... 0 375 100 DEG FLH STL 83385 OBD 163 348 0276 00 1 SHLD GSKT ELEC 0 026 OD NPRNW WIRE NET CO 28817 01 0404 3719 164 210 0205 00 1 TERMINAL LUG SE 8 86928 5442 7 ATTACHING PARTS 165 210 0457 00 1 NUT PL ASSEM WA 6 32 X 0 312 INCH STL 83385 OBD 166 212 0004 00 1 SCREW MACHINE 8 32 X 0 312 INCH PNH STL 83385 OBD 167 220 0811 00 1 NUT BLOCK 3 8 32 1 4 40 1 375 L 80009 220 0811 00 ATTACHING PARTS 168 2...

Page 160: ...STL CD PL 83385 211 041800 00 ATTENUATOR INCLUDES 18 ATTENUATOR CHANNEL 2 SEE A7 EPL ATTACHING PARTS 19 211 0244 00 4 SCR ASSEM WSHR 4 40 X 0 312 INCH PNH STL 78189 OBD 20 211 0246 00 1 SCR ASSEM WSHR 4 40 X 0 625 INCH PNH STL 78189 OBD _ CRT BOARD INCLUDES 21 136 0263 04 5 SOCRET PIN TERM FOR 0 025 INCH SQUARE PIN 22526 75377 001 22 131 1779 02 1 CONT ASSY ELEC CAM SW 13 CONTACT RIGHT CH2 80009 1...

Page 161: ...0 0406 00 4 NUT PLAIN HEX 4 40 X 0 188 INCH BRS 73743 2X12161 402 61 343 0564 00 1 RTNR BAR CONT ATTENUATOR LEFT CHI 80009 343 0564 00 62 214 1126 01 4 SPRING FLAT GREEN COLORED 80009 214 1126 01 63 214 1752 00 4 ROLLER DETENT 80009 214 1752 00 64 105 0679 00 1 ACTUATOR CAM SW ATTENUATOR 80009 105 0679 00 65 401 0338 00 1 BEARING CAM SW FRONT 80009 401 0338 00 66 1 DRUM CAM SWITCH SEE S4100 EPL 67...

Page 162: ...03 131 1750 01 B022730 1 TERM FEEDTHRU 8 PIN INSULATED 80009 131 1750 01 131 0608 00 XB010787 2 TERMINAL PIN 0 365 L X 0 025 PH BRZ GOLD 22526 47357 101 344 0154 00 2 CLIP ELECTRICAL FUSE CKT BD MT 80009 344 0154 00 102 1 SW SLIDE DPDT 3A 125VAC SEE S701 705 EPL 198 4152 00 1 WIRE SET ELEC 80009 198 4152 00 198 3704 00 1 WIRE SET ELEC 80009 198 3704 00 103 131 0707 00 5 CONNECTOR TERM 22 26 AWG BR...

Page 163: ... 2 0 0 1 2 0 3 0 0 1 C O V E R F R O N T SEE M E C H A N I C A L P A R T S LI S T F I G 1 1 8 0 0 0 9 2 0 0 1 2 0 3 0 0 0 7 0 2 3 7 3 0 0 1 M A N U A L T E C H OPERATORS 8 0 0 0 9 0 7 0 2 3 7 3 0 0 0 7 0 2 3 7 4 0 1 1 M A N U A L T E C H S E R V I C E O P T I O N A L A C C E S S O R I E S 8 0 009 0 7 0 2 3 7 4 0 1 01 6 0 5 5 4 0 0 1 C O V E R P R O T 8 0 0 0 9 0 16 0 5 5 4 0 0 3 7 8 0 6 7 7 0 1 1 ...

Page 164: ......

Page 165: ...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 166: ...ude out High Amplitude output put 60 V 100 V 067 0502 01 PG 506 Does not have 0502 01 Comparator output chopped feature can be alternately chopped to a refer ence voltage SG 503 replaces 190 190A 190B SG 503 Amplitude range 190B Amplitude range 40 mV 5 mV to 5 5 V p p to 10 V p p 191 067 0532 01 SG 503 Frequency range 0532 01 Frequency range 250 kHz to 250 MHz 65 MHz to 500 MHz SG 504 replaces 067...

Page 167: ... B023856 UP__________ Manual Part No 070 2374 01 DESCRIPTION REPLACEABLE ELECTRICAL PARTS AND SCHEMATIC CHANGES CHANGE TO A8 R4174 R4274 670 5247 03 321 0081 00 321 0081 00 CKT BOARD ASSY VERTICAL RES FXD FILM 68 1 OHM 1 0 125W RES FXD FILM 68 1 OHM 1 0 125W R4174 and R4274 are located on the A8 VERTICAL board and are shown on VERTICAL INPUT diagram 1 Page 1 of 1 ...

Page 168: ...ENSITY is set fully counterclockwise the displayed dot will extinguish within 15 minutes after instrument turn on Correct values are selected during manufacture of the instrument and should not require changing unless there has been a major repair such as a cathode ray tube replacement To check operation and select values of either resistor perform the following steps 1 With no signal applied turn...

Page 169: ...If the Step 2 check is OK repeat steps 3 and 4 If Step 4 check is also OK the selection process is completed If the Step 4 check is unsatisfactory proceed to Step 7 7 To select R469 reduce its value to the next lower nominal value in steps while repeating Steps 3 and 4 until satisfactory results are obtained Repeat Steps 1 through 7 as necessary REPLACEABLE ELECTRICAL PARTS SCHEMATIC CHANGES CHANG...

Page 170: ...LECTRICAL PARTS AND SCHEMATIC CHANGES A12 670 5350 03 CRT BOARD ASSY HORIZONTAL C2322 281 0611 00 CAP FXD CER D I 2 7PF 0 25PF 500V R2310 321 0160 00 RES FXD FILM 453 OHM 1 0 125W R2317 315 0511 00 RES FXD CMPSN 510 OHM 5 0 25W REMOVE RT2310 307 0477 00 RES THERMAL IK OHM 10 6MW DEG C The above parts are located on the HORIZONTAL circuit board assembly and are shown on diagram 5 SWEEP HORIZONTAL A...

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