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Tektronix 485, Instruction Manual

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Tektronix 485 Instruction Manual Download Page 26

Circuit Description—485/R485 Service

coupling  path  for  AC  changes  to  the  input  of  U1624.  The 
output correction  is  AC coupled  through  C l612 directly to 
the  cathode.  CR1618,  CR1621,  CR1626,  and  CR1627 
provide short-circuit protection.

Grid  DC  Restorer.  The  purpose  of  the  DC  restorer 

circuit  is  to  elevate  the  output  of  the  Z-Axis amplifier to a 
potential  more  negative  than  the cathode, thereby  allowing 
the  grid  to  control  the  beam  current  of  the  CRT.  The 
circuits  are  short-circuit  protected  by  R1685,  DS1684,and 

DS1685;  R1668,  DS1668, and  DS1669.

The  DC  Restorer  is  current  driven  from  the square  wave 

at the high  voltage  winding  through  R1603,  R1604,  R1605, 
and  R1606.  When  T1960  goes  positive,  CR1660  conducts 
at  the  grid  bias  voltage  potential.  This  clamping  action 
establishes  the  positive  swing  of  the  DC  Restorer drive. On 
the  negative  swing  of  T1960,  CR1663  conducts  at  the 
voltage  established  by  the  Z-Axis  output.  This  clamping 
action  establishes  the  negative  swing  of  the  DC  Restorer 
drive.  The  AC  swing  of  the  DC  Restorer  drive  is  coupled 
from  the  low  voltage  section  to  the high voltage section  by

C l663.  On  the  positive  swing of the  DC  Restorer drive, the 

high  voltage  end  of  C l663  is  clamped  to  the  cathode 
voltage  by  CR1666.  During  the  negative  swing  of  the  DC 

Restorer  drive,  CR1664  charges  Cl 664  to  a  voltage  more 

negative  than  the  cathode  by  an  amount  equal  to  the 
difference  between  the  grid  bias  setting  and  the  voltage  at 
the  output  of  the  Z-Axis  amplifier.  Fast  AC-coupling 
between  the  Z-Axis  and  the  CRT  grid  is  provided  by 
C1684.  A  slower  AC  path  is  by  way  of  R1684 and  C1664.

Focus  DC  Restorer.  The  operation  of  the  Focus  DC 

Restorer  circuit  is  similar  to  the  operation  of  the  Grid  DC 
Restorer.  The AC swing of  the  DC  Restorer drive is coupled 

from  the  low  voltage  circuit  to  the  high  voltage  circuit  by 
C1651.  The  positive  swing  w ill  be  established  when 
CR1656  clamps  at  the  Focus  DC  Restorer  level  voltage. 
This  voltage  is  approximately  173 V.  The  negative  swing is 
established  when  CR1652  clamps  at  the  output  voltage  of 
the  Auto-Focus  amplifier.  During  the  positive  swing  of the 

Focus  DC  Restorer  drive,  the  high  voltage  end  of C l651  is 

clamped  to  the  focus  pot  voltage  by  CR1646.  During  the 

negative  swing  of  the  Focus  DC  Restorer  drive,  CR1651 

charges  C1652  and  thereby  establishes  the  proper  level  at

BEAM CURRENT

Fig. 3-7.  CRT circuit  block  diagram.

REV.  B, AUG.  1975

3-13

Summary of Contents for 485

Page 1: ...TEKTRONIX 4 8 5 R 4 8 5 OSCILLOSCOPE S E R V I C E IN S T R U C T IO N M A N U A L Tektronix Inc P 0 Box 500 Beaverton Oregon 97005 Serial Number 070 1193 00 473 ...

Page 2: ...3 12 Anode Supply 3 12 Cathode Supply 3 12 Cathode Regulator 3 12 Grid DC Restorer 3 13 SECTION 3 CIRCUIT DESCRIPTION cont Page Focus DC Restorer 3 13 Beam Current Limit 3 14 Power Supply Shutdown Caused by Excessive Beam Current 3 14 CRT Control Circuits 3 14 Auto Focus Circuit 3 14 Calibrator 3 15 SECTION 4 MAINTENANCE Introduction 4 1 Cover Removal and Reinstallation 4 1 Cleaning 4 1 Lubricatio...

Page 3: ...485 R485 rviice T h 5 0 Oscil oscope ...

Page 4: ... input IX 10 Hz or less Deflection Factor 5 mV div to 5 V div in 10 calibrated steps 1 2 5 sequence accurate within 2 Uncalibrated continu ously variable between steps to at least 12 5 V div Lights at edge of knob skirts indicate correct deflection factor for IX 10X and 100X probes Gain can be recalibrated at front panel 1 M 2 BAL is available at bottom panel to eliminate step attenuator shift abo...

Page 5: ...eak AC 500 V P P to 1 kHz AC coupled 500 V DC peak AC 500 V P P to 1 kHz Common Mode Rejection Added Mode with Channel 2 inverted At least 10 1 at 50 MHz for 8 division signal after adjusting CH 2 gain for best CMR at 50 kHz and 20 mV div Bandwidth Limiter Limits to approximately 20 MHz the Vertical Amplifier and Internal Trigger signals Channel Isolation At least 30 1 at 350 MHz A Ext Trigger Dis...

Page 6: ...ed AUTOMATIC Sweep free runs in the absence of a triggering signal and for signals below 20 Hz SINGLE SWEEP Sweep runs one time on the first triggering event after pressing the reset selector Time Base A and B Trigger Sensitivity Trigger Mode To 50 MHz At 350 MHz DC Int 0 3 div 1 5 div DC Ext 20 mV 100 mV AC Signals below 16 Hz are attenuated LF Reject Signals below 16 kHz are attenuated HF Reject...

Page 7: ...gger Holdoff in Norm detent A Time Setting 1 ns div to 0 1 ps div Less than 0 4 ps 0 2 ps div Less than 1 0 ps 0 5 ps div to 0 5 s div Less than 2 times the A TIME DIV setting A Trigger Holdoff Adjustable control permits a stable presentation of repetitive complex waveforms The control covers at least the time of one full sweep for sweeps faster than 0 2 s div B Ends A The A sweep is reset at the ...

Page 8: ...ut extra charge 21 kV accelerating potential Photographic Writing Speed At least 3 div ns for standard P31 phosphor at least 6 div ns for optional P11 phosphor with the TEKTRONIX C 31 R Camera and POLAROID 10 000 ASA film Auto Focus Automatically maintains beam focus for all intensity settings Intensified zone and EXT Z axis are not auto focused Graticule Internal no parallax Variable edge lightin...

Page 9: ...ISTICS Ambient Temperature Operating 15 Cto 55 C Storage 35 C to 75 C Altitude Operating to 15 000 feet Maximum allowable ambient temperature decreased by 1 C per 1000 feet from 5 000 to 15 000 feet Nonoperating to 50 000 feet Vibration5 Operating 15 minutes along each of the three axis 0 025 inch peak to peak displacement 4 g s at 55 Hz 10 to 55 to 10 Hz in 1 minute cycles Shock5 Operating and No...

Page 10: ... if the internal temperature exceeds a safe operating level Power is automatically restored when the temperature returns to a safe level Clean the air filter periodically a dirty filter prevents adequate air flow into the instrument CONTROLS AND CONNECTORS Power Cord Conductor Identification Conductor Color Alternate Color Ungrounded Line Brown Black Grounded Neutral Blue White Grounding Earthing ...

Page 11: ...Connector ten steps 1 2 5 sequence Attenu ating probe tip deflection factors for X I0 and X I00 coded probes are POSITION Controls automatically indicated by the three readout lamps at the circum ference of this knob All three lamps are off when the channel is CH 1 and CH 2 not selected for display by the VERT MODE selector or when using probe IDENTify Provide continuously variable deflection fact...

Page 12: ... attenuated DC DC direct couples all trigger sig nals to the trigger circuitry EXT TRIG Input BNC connector providing input for Connector external trigger signals SLOPE Switch A Permits triggering the sweep on the TRIGGERING and positive or negative going portion B TRIGGERING of the trigger signal LEVEL Control A Selects amplitude point on the TRIGGERING and triggering signal where sweep B TRIGGER...

Page 13: ...ar waveform coincident with A sweep BNC connector provides a sample of A sawtooth generator signal Z AXIS INPUT BNC input connector for intensity Connector modulation of the CRT display PROBE POWER Two 4 pin connectors at the rear of the instrument provide power suit able for optional active probes such as the P6201 LINE CORD Power cord is a 3 wire permanently attached cable approximately 7 5 feet...

Page 14: ... by U48 which compares the voltage levels at the base of Q40 and the output J70 C46 matches the time constant of C77 and R75 with the time constant of R42 and parallel combina tion of C46 and C47 C48 sets the bandwidth of U48 50 ft OVERLOAD PROTECTION In the 50 ft mode K1 is closed by U80 which routes the signal to the 50 ft attenuator 50 ft input protection is provided by an RMS detecting circuit...

Page 15: ...in for the trigger signal RT551 temperature compensates the gain of stages U310 through Q564 Q552 and Q556 select the bandwidth of the trigger signal In the full bandwidth mode Q556 is on and Q552 is off Filter L559 R559 R557 and C557 provides a constant impedance at all frequencies as the collector load of Q556 and thus full bandwidth In the 20 MHz mode Q552 is on Q556 is off and high frequencies...

Page 16: ...led by the mode switch in CH 1 CH 2 ADD or X Y In the ALT or CHOP mode the IC s control the input to pin 7 of U15358 to cause it to either alternate on command from A GATE or to CHOP When the HORIZ is in ALT and the vertical in ALT U1535B changes state only every other A GATE Note that A GATE is the signal that activates U1535 in ALT and the signal from U1530B pin 6 only allows every other A GATE ...

Page 17: ...NS AFTER DELAY TIME mode that disconnects the trigger amplifier In addition it uses A Trigger Gate and delay pickoff gate as hold off In the triggerable mode the B Trigger Generator triggers only after receiving both the delay pickoff and A Gate signals Delay pickoff gate drives comparator Q1092 and Q1096 Both A Gate and delay pickoff gate are required to drive Q1082 The output of Q1074 provides a...

Page 18: ... is inserted to provide offset Q1362 and Q1364 compose a HI gain amplifier The feedback R is R1364 and R1366 The input resistance in B sweep is R1321 and R1322 If A sweep is selected the input resistance is R1307 and R1308 By selecting B sweep and adjusting R1366 the hori zontal gain is set Then by selecting A sweep and adjusting R1308 A sweep may be calibrated Both adjustments are done in 0 1 ms ...

Page 19: ... and R1813 are damping resistors C l812 and Cl 813 are common mode filters and C1814 is a differential filter R1811 discharges Cl 814 when the power switch is off Line Input Circuit Thermal cutout S1802 provides thermal protection for this instrument If the temperature exceeds a safe operating level S1802 opens to interrupt the applied power When the temperature returns to a safe operating level S...

Page 20: ...turns on C l835 discharges thru LI 835 to start the Inverter After operation has begun CR1842 discharges C l829 with each cycle of the Inverter This disables the start network Inverter Refer to the simplified schematic shown in Fig 3 2 Once the Inverter has been started by the Start Network the Inverter is self oscillating Feedback necessary for oscilla tion is provided by base drive transformer T...

Page 21: ...llows In the stable state of the multivibrator pin 9 will be near ground holding Q1900 off As the inverter current goes thru zero either pin 10 or pin 11 will go positive depending on polarity This positive pulse sets the multivibrator into its unstable state During the unstable state pin 9 will be positive holding Q1900 on The duration of the unstable state is determined by the voltage sensed at ...

Page 22: ... are possible depending upon the current available from the DC source The object is to prevent high surge currents which can occur during hot turn on when the thermistors are low in value and the line storage capacitors are discharged a If the instantaneous current available from the DC source is limited to 30 A or less connect a jumper from the Line Stop test point TP1918 to ground Circuit board ...

Page 23: ... V supplies are essentially identical to 9 V and 5 V supplies except that the driving amplifiers are ground referenced POWER SUPPLY PROTECTION CIRCUIT The power supply protection circuit provides fault protection for the inverter low voltage and high voltage power circuits Fig 3 5 shows a simplified block diagram of the protection circuit A schematic of this circuit is shown on diagram 14 at the r...

Page 24: ... provides over current protection for the H V winding of T1960 and beam current protection for the CRT Pin 2 of U1910 is the input to the voltage balance amplifier If the voltage at pin 2 of U1910 is more positive than 200 mV or Fig 3 5 Simplified block diagram of power supply protection circuit 6 ms Fig 3 6 Protection circuit duty cycle T REV APR 1974 3 11 ...

Page 25: ...910 The time it takes pin 1 to reach 0 7 V determines the sampling period When pin 1 reaches 0 7 V pin 8 of U1910 will go positive stopping the Inverter Over voltage on the 120 V supply will cause VR1912 to conduct charging C1912 which stops the Inverter CRT CIRCUIT General The CRT Circuit produces the high voltage potentials and provides the control circuits necessary for the opera tion of the ca...

Page 26: ...ion by C l663 On the positive swing of the DC Restorer drive the high voltage end of C l663 is clamped to the cathode voltage by CR1666 During the negative swing of the DC Restorer drive CR1664 charges Cl 664 to a voltage more negative than the cathode by an amount equal to the difference between the grid bias setting and the voltage at the output of the Z Axis amplifier Fast AC coupling between t...

Page 27: ...ow the 1 V level As the voltage reaches about 0 5 V the Q1546 collector voltage is approximately 0 9 V and operates the power supply shutdown by connection through diode CR1959 To prevent shutdown being signaled during the first 200 ms of instrument turn on Cl 538 thru R1538 pro vides a delay to compensate for charging currents in the CRT post accelerator supply Diode CR1533 biases the 15pA networ...

Page 28: ...operate at a minimum power level consistent with the displacement current output required A DC Restorer network provides for coupling the output of the Auto Focus amplifier to the focus electrode of the CRT This consists of four diodes six capacitors and four resistors including C1651 and C1681 The low intensity focus is controlled by the high voltage focus pot which is located for operator adjust...

Page 29: ...otects this instrument from dust in the interior and also provides protection to personnel from the operating potentials present In addition it reduces the EMI radiation from the instrument or EMI interference to the display due to other equipment WARNI NG Extreme caution must be used when troubleshooting in the Power Supply due to the line voltage and the high potentials present Refer to the disc...

Page 30: ...d not be used CRT Clean the plastic light filter and the CRT face with a soft lint free cloth dampened with denatured alcohol The CRT mesh filter furnished with EMI Option 4 only can be cleaned in the following manner 1 Hold the mesh filter in a vertical position and brush lightly with a soft No 7 water color brush to remove light coatings of dust or lint 2 Greasy residues or dried on dirt can be ...

Page 31: ... troubleshooting of the 485 Information contained in other sections of this manual should be used along with the following information to aid in locating the defective component An understanding of the circuit operation is helpful in locating troubles particularly where integrated circuits are used See the Circuit Description section for this information Troubleshooting Aids Diagrams Complete circ...

Page 32: ...Maintenance 485 R 485 Service 4 4 Fig 4 1 Electrode configuration for semiconductors in this instrument ...

Page 33: ...circuit tracing Troubleshooting Equipment The following equipment is useful for troubleshooting the 485 1 Transistor Tester Description Dynamic type tester Must be capable of measuring reverse breakdown voltages of at least 400 volts Recommended type Tektronix Type 576 Transistor Curve Tracer 2 Multimeter Description 10 megohm input impedance and 0 to 500 volts range AC and DC ohmmeter 0 to 50 meg...

Page 34: ... 9 0 will track with 50 The cathode regulator will interact with both 50 and 59 4 volt supplies NOTE See the specific information in this section on Troubleshooting the Power Supply for further information Check Voltages and Waveforms Often the defective component can be located by checking for the correct TABLE 4 3 Power Supply Tolerance and Ripple Referenced to TP GND Power Supply Tolerance Maxi...

Page 35: ...rs one by one however comb con nectors BB CC DD S T U V and W must not be removed with power on With power off any or all of the comb con nectors can be removed for troubleshooting with an ohmmeter To detect a short in the 2950 V supply perform the following 1 Turn power off 2 Remove comb U and bend pin 3 to prevent contact 3 Re install comb U and turn power on If other supplies now perform correc...

Page 36: ...check for open line fuse or other malfunction Check for start pulse with AC coupled probe at TP 1835 AC coupled probe required due to lack of ground reference in Inverter circuit Start pulse should occur each line cycle Check Q1900 and Q1902 for shorts If either transistor is shorted the inverter will not start Line fuse opens when power is turned on Check Line Selector switch for correct position...

Page 37: ...it output leads shorted etc w ill cause Q688 to crowbar the 25 V supply which stops the inverter via the balance node I f the relays dick each time the inverter starts some semi regulated supplies are briefly coming up to value Look for a fault on 25 V Beam Lim it Shutdown or a short on one o f the regulated supplies 50 9 9 5 or 5 V 5 V D IV 10 ms DIV A A t TP 15 Power Supply coming up to nominal ...

Page 38: ... on 15 supply 0 V 5 V D IV 20 psec DIV I At TP1926 Inverter Current Sens during normal opera tion JJI 5 V D IV 20 psec DIV 0 V J l At TP1919 Mono Ramp during normal operation 5 V DIV 20 psec DIV 0 V K At collector of Q1900 during normal operation 50 m V DIV 20 psec DIV L At TP 59 4 Ripple on 59 4 supply during normal operation AC coupled M X10 Probe at Anode of CR1660 Normal operation with intensi...

Page 39: ...hasing or ordering replacement parts check the parts lists for value tolerance rating and description NOTE When selecting replacement parts it is important to remember that the physical size and shape o f a component may affect its performance in the instrument particularly at high frequencies A ll replacement parts should be direct replacements unless it is known that a different component w ill ...

Page 40: ... Replacement WA RNI NG Disconnect the instrument from the power source before replacing components General The exploded view drawings associated with the Mechanical Parts List located at rear of manual may be helpful in the removal or disassembly of individual com ponents or sub assemblies WA RNI NG Line AC and stored DC potentials are present inside the power unit This instrument should be operat...

Page 41: ...d discharge to the nearby Vertical Deflection connections This procedure must be repeated every time the Post Accelerating lead is removed If it is connected and removed w ithout the instrument being turned on it w ill have accepted a charge from the Anode M ultiplier and w ill again be dangerous when disconnected d Disconnect the Post Accelerating Anode lead top side of instrument Unclamp the fem...

Page 42: ...ted POWER switch must be turned o ff before removing or replacing semiconductors Replacement semiconductors should be of the original type or a direct replacement Fig 4 1 shows the lead configuration of the semiconductors used in this instru ment Some plastic case transistors have lead configurations which do not agree with those shown here If a replacement transistor is made by a different manufa...

Page 43: ... as follows WARNI NG remains on the Post Accelerating Anode lead after the instrument has been turned off When disconnecting the Post Accelerating lead p u ll it out in a manner that it w ill touch and discharge to the chassis ground immediately after clearing the housing take care to avoid discharge to the nearby vertical deflection connections This procedure must be repeated every time the Post ...

Page 44: ...R HORIZ AMP BOARD HORIZONTAL AMP REMOVED IN LATER PRODUCTION J AA BB CC DC RESTORE A B C D nn c nnnn CATHODE REG VERT BOARD SCALE ILLUM VERT PREAMP J X Y Z VERT OUTPUT AMP 1193 14 Fig 4 3 Interboard comb connection locations 4 16 REV B AUG 1975 ...

Page 45: ...k the calibration of any other steps listed in the INTERACTION part of this step TEST EQUIPMENT REQUIRED The following test equipment and accessories or its equivalent is required for complete calibration of the 485 The equipment specifications given are the minimum necessary for accurate calibration and may be less than those of the listed test equipment The test equipment must be operating withi...

Page 46: ...xt Z Axis blanking CMR Ext Trigger Single Sweep X Y Bandwidth Bandwidth limit TEKTRONIX Type 191 Con stant Amplitude Signal Gen erator High Frequency Constant Amplitude Signal Generator Frequency 100 to 350 MHz output amplitude 0 5 to 5 V reference frequency 3 MHz accuracy within 1 Vertical bandwidth check TEKTRONIX 067 0532 01 Calibration Fixture Test Oscilloscope Bandwidth DC to 100 MHz deflecti...

Page 47: ...or signal attenuation TEKTRONIX Part No 011 0059 02 T Connector Connector BNC Ext Trig checks TEK TR O N IX Part No 103 0030 00 Termination 2 required Impedance 50 12 accuracy 2 connectors BNC CMR check TEK TR O N IX Part No 011 0049 01 Cable 2 required Impedance 50 12 type RG 58 U length 42 inch con nectors BNC Used throughout the pro cedure for signal intercon nection TEKTRONIX Part No 012 0057 ...

Page 48: ...plifier PART 1 PERFORMANCE CHECK Connect the 485 to a power source which meets the specified voltage and frequency requirements Press the POWER pushbutton to turn the 485 on and allow a 20 minute instrument warmup before commencing the Per formance checks The Performance checks in Part 1 o f this section may be performed anywhere within the 15 C to 55 C operating ambient temperature range unless o...

Page 49: ...B display to a reference position c Rotate the DTP to 9 0 and then slightly from 9 0 to place the B display marker to the same screen reference position Read the error from 9 00 in minor dial divisions on the DTP dial TABLE 5 3 A Time Div Reference DTP Position Maximum DTP Dial Error at Setting near 9 0 minor divisions 10 ns 4 0 7 20 ns 2 0 9 50 ns to 1 ms 1 0 5 2 ms to 0 5 s 1 0 9 7 CHECK B ENDS ...

Page 50: ...enuator and dual BNC input cable TEKTRONIX Part No 067 0525 00 b CH 1 and CH 2 inputs 50 2 DC VOLTS DIV to 20 mV VERT MODE to CH 1 Apply 8 divisions of 50 kHz signal c Set VERT MODE to ADD CH 2 INVERTED Push to release CH 2 VARIABLE GAIN and adjust for minimum deflection d Set Type 191 Signal Generator to 50 MHz and check for 0 8 div or less of vertical deflection e Change generator to 50 kHz and ...

Page 51: ... CAL 5 V to CH 1 input c Check for 5 divisions of signal 0 025 div 0 5 Outside 15 C to 35 C range check for 0 05 div 1 d Set input impedance to 50 S2 apply 0 6 V from 50 Amplitude Calibrator Set VOLTS DIV to 0 1 V adjust VARIABLE for 6 divisions of deflection Connect CAL 5 V to CH 1 input e Check for 5 divisions of signal 0 05 div 1 0 Outside 15 C to 35 C range check for 0 25 div 1 5 2 2 CHECK CAL...

Page 52: ...to DC VOLTS DIV to 2 V position trace to top graticule line input impedance to 50 ft b Connect Type 106 High Amplitude to CH 1 input slowly increase Type 106 amplitude c Check that the input disconnects trace returns to top graticule line and reset lamp lights after the trace crosses the 2 8 graticule division point and before it reaches the 4 25 division point Return Type 106 amplitude to mini mu...

Page 53: ...IBRATOR 1 kHz DUTY CYCLE 49 8 to 50 2 a Connect 1 kHz of CAL 5 V to CH 1 input CH 1 impedance to 50 El CH 1 VOLTS DIV to 0 1 V INT TRIG to NORM A TIME DIV to 0 1 ms B TIME DIV to 1 ps HORIZ DISPLAY to INTEN B TRIGGER SOURCE to B RUNS AFTER DELAY TIME b Trigger A on SLOPE use DELAY TIME POSITION control to position the intensified portion of the negative step near center screen c Switch HORIZ DISPL...

Page 54: ... 191 Signal Generator to EXT Z AXIS blanking rear panel and A EXT TRIG a With low intensity level set VERT MODE to X V b Adjust trigger LEVEL for TRIG D LIGHT b Adjust FOCUS and ASTIG rear panel for optimum spot size c At normal intensity check for intensity modulation c Set INTENSITY and B INTENSITY CCW d Change Type 191 to 2 V P P and 2 MHz to EXT Z AXIS blanking and A EXT TRIG set TIME DIV to 0...

Page 55: ...ning at 1 ms div a With test oscilloscope check the following outputs located on the rear panel b A and B GATES approximate amplitude 4 V 0 5 V into 50 2 c A SAWTOOTH approximate amplitude 10 V 0 5 V into 50 O 15 ADJUST TRACE ROTATION a Position trace to graticule center b Adjust TRACE ROTATION rear panel so trace parallels center graticule line 16 ADJUST Y AXIS ALIGNMENT a Apply 1 ms and 0 1 ms m...

Page 56: ... d Adjust DELAY STOP R925 for the intensified portion on the tenth time mark and the pulse on B trace to just start positive at the front of B trace e Repeat steps b through d for indentical B displays at the two DTP dial settings 25 CHECK 0 1 ms DELAY LINEARITY a Same setup as in step 24 except change time marks to 50 ms b Turn DTP dial fully CCW The first marker should be displayed on B display ...

Page 57: ...ns div and trigger it on the SLOPE of the 485 A GATE c Connect the test oscilloscope 10X probe 10 MS2 to the IN test point located near the center of the Sweep board Make the probe ground connection at one of the GND test points on the Sweep board Set test oscilloscope Volts Div for a probe tip deflection factor of 50 mV div d This display of the A sweep generator input consists of a positive step...

Page 58: ... time marks that give 1 to 5 markers div on the A display Use B TIME DIV for 1 ns for A TIME DIV settings of 10 ns through 0 1 Ms For A TIME DIV setting of 0 2ms and slower maintain an A B ratio of 100 1 b Set the DTP dial exactly to the reference position 1 0 except at the fastest speeds Use the POSITION HORIZ control to move the marker on the B display to a reference position c Rotate the DTP to...

Page 59: ...be lights X10 LED b Check that CH 2 LED S are off with VERT MODE in CH 1 c Check that CH 1 LED S are on in CH 1 ALT CHOP ADD and X Y d If probes are not available an 11 k 2 resistor to ground from the code ring around each input BNQIight the X10 LED a 6 8 k 2 resistor lights X100 LED and a short circuit causes trace ident 41 CHECK CH 2 LED S a Check that the probe lights the corresponding LED b Ch...

Page 60: ... the DVM reading should be within 10 mV of being 200 mV away from the reading in 47b 49 ADJUST 50 ft INPUT IMPEDANCE CH 1 and CH 2 a Set input to 50 ft VOLTS DIV to 50 mV VERT MODE to CH 1 position trace to center graticule line b Set DVM to correct ohms scale and connect to CH 1 input Note the amount of trace shift caused by the meter current If the trace has shifted over 2 div 100 mV the measure...

Page 61: ... VERT c Check for 1 0 div of trace shift or less 54 CHECK BEAM FINDER a Check that trace remains within the graticule area with BEAM FINDER depressed b Check beam finder operation under all combinations of HORIZONTAL CH 1 and CH 2 POSITION controls 55 ADJUST LOW FREQUENCY VERTICAL TRANSIENT RESPONSE a These adjustment part of MAIN VERT TRANS RESP are located at the rear of the Vertical board They ...

Page 62: ...isplayed on the test oscilloscope 60 CHECK 50 ft ATTENUATOR ACCURACY 2 CH 1 and CH 2 Check all 50 2 attenuator positions with a 1 kHz square wave from 50 2 Amplitude Calibrator 61 ADJUST POSITION CENTER CH 1 and CH 2 a C H I to 20 mV div DC coupled apply 8 div of 50 kHz from the Type 191 Constant Amplitude Signal Generator b Switch to 10 mV div and adjust POS CTR R275 so the top and bottom are equ...

Page 63: ...TE CURRENT CH 1 and CH 2 Switch from GND to DC in 5 mV check for 0 2 div or less of shift 65 ADJUST 1 M 2 AMPLIFIER GAIN CH 1 and CH 2 NOTE Adjustments are labeled on the bottom shield o f the attenuator compartments a Set VOLTS DIV to 20 mV b Apply 100 mV from Amplitude Calibrator and Com parator then adjust R78 for 5 div of deflection c Check 50 2 1 M 2 gain match 1 in 20 mV div 66 ADJUST 1 MO 1...

Page 64: ... 3 MHz from the High Frequency Constant Amplitude Signal Generator 067 0532 01 as reference a Check for minimum of 4 4 div of signal at 350 MHz in the 50 SI mode b Check 5 10 20 50 mV and 0 1 V c Check for minimum of 4 4 div of signal at 250 MHz in the 1 MJ2 mode d Check 5 10 20 50 mV and 0 1 V e Repeat check for 1 V using 4 divisions as reference and 2 9 divisions the minimum deflection 71 O P T ...

Page 65: ...see step 74B h Monitor the voltage at the OUT TD test point located near the OUT TD control and adjust the OUT TD control R775 R1065 until the trace just disappears Record this voltage i Reconnect the coax to J763 J1063 j Adjust the OUT TD control CCW until the trace just disappears again Record this voltage k Subtract the voltage in part j from the voltage recorded in part h Multiply the result b...

Page 66: ...uators as necessary between the generator cable and the T connector to obtain the 100 mV displayed signal d Switch the generator to 350 MHz without changing the amplitude setting Set the A TIME DIV to one ns di vision for B trigger check set A TIME DIV to 10 ns di vision and B TIME DIV to one ns division e Check that stable triggering can be achieved by ad justing the LEVEL control f Set the SWEEP...

Page 67: ... amplitude point exactly to center screen a Set VERT MODE to ALT VOLTS DIV to 20 mV h Check for 0 5 ns or less delay match of EXT TRIG to CH 2 1 M 2 0 5 div b Center both traces 77 CHECK EXTERNAL TRIGGER LEVEL RANGE A and B c Set VERT MODE to X Y a Connect 1 V from the Amplitude Calibrator to A EXT TRIG A TRIGGER SOURCE to EXT SWEEP MODE to NORM d Adjust X Y center R1355 located on Sweep board to ...

Page 68: ...ract g Switch to 20 MHz limit compromise phasing adjust ments between full and 20 MHz limit for less than 0 2 div opening with 7 div of signal 83 CHECK X Y BANDWIDTH a Ground CH 1 apply 10 div of 50 kHz to CH 2 b Check for at least 4 MHz bandwidth at 3 dB point 84 CHECK BANDWIDTH LIM IT a Set VERT MODE to CH 1 and apply 6 div of 50 kHz b Hold BANDWIDTH pushbutton in c Check for 17 to 23 MHz bandwi...

Page 69: ...ls of the rack and the chassis section is attached to the instrument The intermediate section slides between the stationary and chassis sections and allows the Type R485 to be extended out of the track When the instrument is shipped the stationary and intermediate sections of the tracks are packaged as matched sets and should not be separated To identify the left or right assembly note the positio...

Page 70: ...o the front rails of the rack with the securing screws and washers This mounting method should be used only if the instrument will not be subjected to shock or vibration and if it is installed in a stationary location Removing or Installing the Instrument After initial installation and adjustment of the slide out tracks the Type R485 can be removed or installed by following the instructions given ...

Page 71: ...apped for 10 32 screws Rear rail Front rail Stationary section Chassis section Intermediate section I_____ Fig 6 2 The 485 installed in a cabinet rack sides removed A held into rack with securing screws B extended on slideout tracks 6 3 Fig 6 3 Slideout track assemblies ...

Page 72: ... 10 32 screws Untapped holes B Untapped front rail Note Use FHS screws if front rail holes are countersunk Fig 6 4 Methods of mounting the stationary section to the front rails 6 4 Fig 6 5 Locating the mounting holes for the stationary sections Same dimensions apply to right stationary section ...

Page 73: ... the instrument outward until the stop latches snap into the stop latch holes 3 Disconnect the power cord 4 Press both stop latches and pull the instrument out of the rack Fig 6 6 Procedure for inserting or removing the instrument after the slideout tracks have been installed TO ADJUST ALIGNMENT 1 Position the instrument with the pivot screws approximately even with the front rails 2 Loosen the mo...

Page 74: ...Rackmounting 485 R485 Service 6 6 ...

Page 75: ... 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 OOX Part removed after this serial number ITEM NAME In the Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further...

Page 76: ...LE CARBON CO TEKTRONIX INC BOURNS INC INSTRUMENT DIV BECKMAN INSTRUMENTS INC GRAYHILL INC STANDARD GRIGSBY CO DIV OF SUN CHEMICAL CORPORATION 2015 2ND STREET P 0 BOX 3608 P 0 BOX 128 1201 2ND STREET SOUTH P 0 BOX 5012 13500 N CENTRAL EXPRESSWAY ROUTE 202 60 S JEFFERSON ROAD P O BOX 867 19TH AVE SOUTH 5005 E MCDOWELL RD PO BOX 20923 343 SNYDER AVENUE 11901 MADISON AVENUE 36 RIVER STREET 464 ELLIS S...

Page 77: ... STREET P 0 BOX 372 INDIANAPOLIS IN 46206 91418 RADIO MATERIALS COMPANY DIV OF P R MALLORY AND COMPANY INC 4242 W BRYN MAWR CHICAGO IL 60646 91637 DALE ELECTRONICS INC P 0 BOX 609 COLUMBUS NE 68601 91836 KINGS ELECTRONICS CO INC 40 MARBLEDALE ROAD TUCKAHOE NY 10707 93410 ESSEX INTERNATIONAL INC CONTROLS DIV LEXINGTON PLANT P 0 BOX 1007 MANSFIELD OH 44903 93958 REPUBLIC ELECTRONICS CORPORATION 176 ...

Page 78: ... 01UF 20 50V 72982 8121N075Z5U0103M C41 283 0204 00 CAP FXD CER DI 0 01UF 20 50V 72982 8121N075Z5U0103M CIO 283 0204 00 CAP FXD CER DI 0 01UF 20 50V 72982 8121N075Z5U0103M C121 281 0138 00 CAP VAR PLSTC 0 4 1 2PF 600V 74970 273 0051 001 C161 285 0816 03 CAP FXD PLSTC 0 019UF 10 600V 80009 285 0816 03 C171 281 0580 00 B010100 B019999X CAP FXD CER DI 470PF 10 500V 04222 7001 1374 C18 283 0181 00 CAP...

Page 79: ...B020432 CAP FXD CER DI 47PF 5 200V 72982 374 001T2H0470J C771 281 0634 00 B020433 CAP FXD CER DI 10PF 0 25PF 500V 72982 374 011C0G0100C C82 283 0111 00 CAP FXD CER DI 0 1UF 20 50V 72982 8121 N088Z5U104M C84 283 0204 00 CAP FXD CER DI 0 01UF 20 50V 72982 8121N075Z5U0103M C86 290 0536 00 B010100 B109999 CAP FXD ELCTLT 10UF 20 25V 90201 TDC106M025FL C86 290 0527 00 B110000 CAP FXD ELCTLT 15UF 20 20V ...

Page 80: ... 00 CAP FXD CER DI 0 022UF 20 50V 72982 8121N075Z5U0223M C403 C40S1 290 0512 00 B010100 B109999X CAP FXD ELCTLT 22UF 20 15V 56289 196D226X0015KA1 C407 283 0154 00 CAP FXD CER DI 22PF 5 50V 72982 8111B061COG220J C419 290 0527 00 CAP FXD ELCTLT 15UF 20 20V 90201 TDC156M020FL C421 C423 290 0512 00 B010100 B109999X CAP FXD ELCTLT 22UF 20 15V 56289 196D226X0015KA1 C4251 C427 283 0154 00 CAP FXD CER DI ...

Page 81: ...FXD CER DI 51PF 5 400V 72982 8110N400C0G510J C615 281 0158 00 CAP VAR CER DI 7 45PF 50V 73899 DVJ 5006 C617 281 0122 00 CAP VAR CER DI 2 5 9PF 100V 72982 518 000A2 5 9 C62l C624 283 0191 00 CAP FXD CER DI 0 022UF 20 50V 72982 8121N075Z5U0223M C6251 C633 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C6421 C644 283 0181 00 CAP FXD CER DI 1 8PF 10 100V 72982 8101A108C0K189B C6471 C...

Page 82: ...00V 56289 40C287A2 C821 281 0519 00 B010210 CAP FXD CER DI 47PF 4 7PF 500V 72982 3O8 0OOCOGO470K C824 283 0076 00 CAP FXD CER DI 27PF 10 500V 56289 40C287A2 C83S 283 0204 00 CAP FXD CER DI 0 01UF 20 50V 72982 8121N075Z5U0103M C8372 283 0185 00 B010100 B069999X CAP FXD CER DI 2 5PF 5 50V 72982 8101A058A259B C8382 283 0156 00 CAP FXD CER DIilOOOPF 100 0 200V 72982 8111A208Z5U0102Z C8392 283 0156 00 ...

Page 83: ...5 283 0334 00 B010100 B059999 CAP FXD CER DI 130PF 2 500V 72982 8121N502A131G C1005 283 0618 00 B060000 CAP FXD MICA D 130PF 2 300V 00853 D155E131G0 C1006 283 0068 00 CAP FXD CER DI 0 01UF 100 0 500V 56289 19C241 C1007 283 0159 00 CAP FXD CER DI 18PF 5 50V 72982 8111B065C0G0180J C1011 283 0140 00 CAP FXD CER DI 4 7PF 5 50V 72982 8101E003A479C C1012 283 0204 00 CAP FXD CER DI 0 01UF 20 50V 72982 81...

Page 84: ... CAP FXD CER DI 7 5PF 500V 72982 3O1 0O0C0H0759D C1219 281 0589 00 CAP FXD CER DI 170PF 5 500V 72982 301000Z5D171J C1229 281 0512 00 CAP FXD CER DI 27PF 2 7PF 500V 72982 308 O0OC0G0270K C1232 283 0104 00 CAP FXD CER DI 2000PF 5 500V 72982 811 565B202J C1235 281 0763 00 XB144450 CAP FXD CER DI 47PF 10 100V 72982 8035D9AADC0G470K C1238 281 0528 00 B010100 B109999X CAP FXD CER DI 82PF 8 2PF 500V 7298...

Page 85: ... 0071 00 CAP FXD CER DI 0 0068UF 80 30 5000V 56289 45C10A1 C1619 285 0572 00 CAP FXD PLSTC 0 1UF 200V 84411 TEK44 10402 C1621 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C1622 283 0003 00 CAP FXD CER DIiO OlUF 80 20 150V 72982 855 558Z5U 103Z C1627 283 0060 00 CAP FXD CER DI 100PF 5 200V 72982 855 535U2J101J C1633 283 0327 00 CAP FXD CER DI 1000PF 80 20 4000V 72982 3904BW100C1...

Page 86: ...0PF 10 2000V 56289 C1826 285 0981 00 CAP FXD PLSTC 2 0UF 10 400V 14752 C1827 283 0280 00 CAP FXD CER DI 2200PF 10 2000V 56289 C1829 283 0041 00 CAP FXD CER DI 0 0033UF 5 500V 72982 C1834 290 0284 00 CAP FXD ELCTLT 4 7UF 10 35V 56289 C1835 285 0980 00 CAP FXD PLSTC 0 02UF 5 1000V 56289 C1841 290 0284 00 CAP FXD ELCTLT 4 7UF 10 35V 56289 C1848 290 0159 00 CAP FXD ELCTLT 2UF 50 10 150V 56289 C1849 28...

Page 87: ... FXD CER DI 0 02UF 80 20 150V 72982 855 558 25V02032 C2043 283 0004 00 CAP FXD CER DI 0 02UF 80 20 150V 72982 855 558 25V02032 C2045 283 0004 00 CAP FXD CER DI 0 02UF 80 20 150V 72982 855 558 25V02032 C2046 290 0420 00 CAP FXD ELCTLT 0 68UF 20 75V 56289 150D684X0075A2 C2047 283 0003 00 CAP FXD CER DI 0 01UF 80 20 150V 72982 855 55825U 1032 C2052 283 0004 00 CAP FXD CER DI 0 02UF 80 20 150V 72982 8...

Page 88: ...9 SEMICOND DEVICE iSILICON 175V 100MA 80009 152 0061 00 CR302 153 0051 00 B050000 SEMICOND DEVICE iSILICON MATCHED SET 80009 153 0051 00 CR303 152 0061 00 B010100 B049999 SEMICOND DEVICEiSILICON 175V 100MA 80009 152 0061 00 CR303 153 0051 00 B050000 CR304 152 0061 00 B010100 B049999 SEMICOND DEVICEiSILICON 175V 100MA 80009 152 0061 00 CR304 153 0051 00 B050000 CR410 152 0141 02 SEMICOND DEVICEiSIL...

Page 89: ...150MA 07910 1N4152 CR1217 152 0153 00 SEMICOND DEVICE SILICON 15V 50MA 80009 152 0153 00 CR1221 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR1234 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR1237 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR1238 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR1239 152 0245 00 SEMICOND DEVICE SILICON IONA...

Page 90: ...ON 225V 2OOMA 12969 NDP341 CR1663 152 0242 00 SEMICOND DEVICE SILICON 225V 200MA 12969 NDP341 CR1664 152 0242 00 SEMICOND DEVICE SILICON 225V 200MA 12969 NDP341 CR1666 152 0242 00 SEMICOND DEVICE SILICON 225V 200MA 12969 NDP341 CR1710 152 0141 02 SEMICOND DEVICE SILICON 3OV 15OMA 07910 1N4152 CR1735 152 0107 00 SEMICOND DEVICE SILICON 400V 400MA 80009 152 0107 00 CR1737 152 0141 02 SEMICOND DEVICE...

Page 91: ...52 0412 00 SEMICOND DEVICE SILICON 50V 3A 80009 152 0412 00 CR2042 152 0061 00 SEMICOND DEVICE SILICON 175V 100MA 80009 152 0061 00 CR2047 152 0141 02 B010100 B139999X SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR2052 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR2124 152 0322 00 SEMICOND DEVICE SILICON 15V HOT CARRIER 28480 5082 2672 CR2133 152 0322 00 SEMICOND DEVICE SILICON 1...

Page 92: ...Y CKT CD MT 3 PRONG 80009 131 1003 00 J949 131 0955 00 CONNECTOR RCPT BNC FEMALE W HARDWARE 05091 31 279 J1001 131 0955 00 CONNECTOR RCPT BNC FEMALE W HARDWARE 05091 31 279 J1063 131 1003 00 CONNECTOR BODY CKT CD MT 3 PRONG 80009 131 1003 00 J1064 131 1003 00 CONNECTOR BODY CKT CD MT 3 PRONG 80009 131 1003 00 J1116 131 1003 00 CONNECTOR BODY CKT CD MT 3 PRONG 80009 131 1003 00 J1117 131 1003 00 CO...

Page 93: ...1 L4251 L5011 L5021 L5051 L5061 108 0538 00 COIL RF 2 7UH 76493 70F276A1 L511 L5211 L5221 L5251 L5261 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L531 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L548 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L559 108 0736 00 COIL RF 825NH 80009 108 0736 00 L581 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L583 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L584 108 ...

Page 94: ...78 00 COIL RF 45NH 80009 108 0578 00 L1057 108 0249 00 COIL RF 12UH 76493 70F125A1 L1099 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L1130 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L1131 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L1133 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L1134 108 0249 00 COIL RF 12UH 76493 70F125A1 L1137 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L1156 276 0507 00 SHI...

Page 95: ... COIL RF 80NH 80009 108 0685 00 108 0325 00 COIL RF 0 5UH 80009 108 0325 00 108 0685 00 COIL RF 80NH 80009 108 0685 00 108 0298 00 COIL RF 0 25UH 80009 108 0298 00 149 0030 00 B010100 B069999X METER T TOTAL CIRCUIT CARD MOUNT DC 18583 120 LC 151 1032 00 TRANSISTOR SILICON FET DUAL 80009 151 1032 00 151 0367 00 TRANSISTOR SILICON NPN SEL FROM 3571TP 80009 151 0367 00 151 0367 00 TRANSISTOR SILICON ...

Page 96: ...221 00 0804 151 0221 00 TRANSISTOR SILICON PNP 80009 151 0221 00 Q810 151 0367 00 TRANSISTOR SILICON NPN SEL FROM 3571TP 80009 151 0367 00 Q816 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 0822 151 0221 00 TRANSISTOR SILICON PNP 80009 151 0221 00 Q852 151 0367 00 TRANSISTOR SILICON NPN SEL FROM 3571TP 80009 151 0367 00 Q854 151 0283 00 TRANSISTOR SILICON NPN 07263 S032790 Q8S6 151 0221 00 ...

Page 97: ...SEL FROM 2N3501 80009 151 0124 00 Q1184 151 0270 00 TRANSISTOR SILICON PNP 80009 151 0270 00 Q1192 151 0127 00 TRANSISTOR SILICON NPN 80009 151 0127 00 Q1196 151 0127 00 TRANSISTOR SILICON NPN 80009 151 0127 00 Q1202 151 0367 00 TRANSISTOR SILICON NPN SEL FROM 3571TP 80009 151 0367 00 Q1204 151 0221 00 TRANSISTOR SILICON PNP 80009 151 0221 00 Q1206 151 0283 00 TRANSISTOR SILICON NPN 07263 S032790 ...

Page 98: ...ICON PNP TRANSISTOR SILICON PNP TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN TRANSISTOR SILICON PNP TRANSISTOR SILICON PNP TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN SEL FROM MPS6521 TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN SEL FROM 2N3501 TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN SEL FROM MPS6...

Page 99: ...0 00 RES FXD CMPSN 91 OHM 5 0 125W 01121 R551 311 0605 00 RES VAR NONWIR 200 OHM 10 0 50W 80740 R561 317 0152 00 RES FXD CMPSN 1 5K OHM 5 0 125W 01121 R571 317 0431 00 RES FXD CMPSN 430 OHM 5 0 125W 01121 R591 317 0101 00 RES FXD CMPSN 100 OHM 5 0 125W 01121 R601 317 0390 00 RES FXD CMPSN 39 OHM 5 0 125W 01121 R611 317 0027 00 RES FXD COMP 2 7 OHM 5 0 125W 01121 R621 317 0362 00 RES FXD CMPSN 3 6K...

Page 100: ...R0C R133 321 0085 03 RES FXD FILM 75 OHM 0 25 0 125W 91637 MFF1816D75R00C R134 321 0085 03 RES FXD FILM 75 OHM 0 25 0 125W 91637 MFF1816D75R00C R135 321 0114 03 RES FXD FILM 150 OHM 0 25 0 125W 91637 MFF1816D150R0C R141 321 0940 03 RES FXD FILM 116 7 OHM 0 25 0 125W 91637 MFF1816D116R7C R143 325 0108 00 RES FXD FILM 105 OHM 0 5 0 05W 14298 AME50 C105R0D R144 325 0108 00 RES FXD FILM 105 OHM 0 5 0 ...

Page 101: ...91637 MFF1816G19100F R77T 316 0752 00 RES FXD CMPSN 7 5K OHM 5 0 25W 01121 CB7525 R274 321 0189 00 RES FXD FILM 909 OHM 1 0 125W 91637 MFF1816G909ROF R275 311 0633 00 RES VAR N0NWIR 5K OHM 10 0 SOW 73138 82 30 0 R276 321 0193 00 RES FXD FILM 1K OHM 1 0 125W 91637 MFF1816G10000F R279 321 0097 00 RES FXD FILM 100 OHM 1 0 125W 91637 MFF1816G100R0F R282 315 0152 00 RES FXD CMPSN 1 5K OHM 5 0 25W 01121...

Page 102: ...PSN 5X OHM 5 0 25W 0XX2X R369 3X5 0300 00 BOXOXOO B049999 RES XD CMPSN 30 0HM 5 0 25W 0XX2X R369 3X5 0430 00 B050000 RES FXD CMPSN 43 OHM 5 0 25W 0XX2X R370 3XX XX97 00 RES VAR NONWIR 20K OHM XO XW X2697 R37X 32X 0330 00 BOXOXOO B049999 RES FXD FILM 26 7K OHM X 0 X25W 9X637 R37X 32X 0332 00 B050000 RES FXD FILM 28K OHM X O X25W 9X637 R372 32X 0220 00 RES FXD FILM X 9XK OHM X O X25W 9X637 R373 3X5 ...

Page 103: ...ILM 1 1K OHM 1 0 125W 91637 R4S7 321 0292 00 RES FXD FILM 10 7K OHM 1 0 125W 91637 R458 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 R461 321 0240 00 RES FXD FILM 3 09K OHM 1 0 125W 91637 R464 321 0293 00 RES FXD FILM 11K OHM 1 0 125W 91637 R465 315 0302 00 RES FXD CMPSN 3K OHM 5 0 25W 01121 R466 321 0289 00 RES FXD FILM 10K 0HM 1 0 125W 91637 R468 315 0622 00 RES FXD CMPSN 6 2K OHM 5 0 25W 011...

Page 104: ...100 OHM 5 0 25W 01121 CB1015 R557 321 1087 01 RES FXD FILM 79 6 OHM 0 5 0 125W 91637 MFF1816G79R60D R558 315 0222 00 RES FXD CMPSN 2 2K OHM 5 0 25W 01121 CB2225 R559 321 1087 01 RES FXD FILM 79 6 OHM 0 5 0 125W 91637 MFF1816G79R60D RS60 311 1227 00 RES VAR N0NWIR 5K OHM 20 0 50W 32997 3386F T04 502 RS62 321 0139 00 RES FXD FILM 274 0HM 1 0 125W 91637 MFF1816G274R0F R563 315 0430 00 B010100 B089999...

Page 105: ...K OHM 1 0 125W 91637 MFF1816G80600F R641 321 0280 00 RES FXD FILM 8 06K OHM 1 0 125W 91637 MFF1816G80600F R642 321 0068 00 RES FXD FILM 49 9 OHM 1 0 125W 91637 MFF1816G49R90F R643 323 0145 00 RES FXD FILM 316 OHM 1 0 50W 91637 MFF1226G316R0F R645 317 0121 00 RES FXD CMPSN 120 OHM 5 0 12SW 01121 BB1215 R646 323 0145 00 RES FXD FILM 316 OHM 1 0 50W 91637 MFF1226G316R0F R647 321 0068 00 RES FXD FILM ...

Page 106: ... OHM 1 0 125W 91637 MFF1816G69R80F R732 321 0147 00 RES FXD FILM 332 OHM 1 0 125W 91637 MFF1816G332R0F R733 317 0240 00 RES FXD CMPSN 24 OHM 5 0 125W 01121 BB2405 R734 317 0390 00 XB050000 RES FXD CMPSN 39 OHM 5 0 125W 01121 BB3905 R735 321 0147 00 RES FXD FILM 332 OHM 1 0 125W 91637 MFF1816G332R0F R7361 321 0082 00 RES FXD FILM 69 8 OHM 1 0 125W 91637 MFF1816G69R80F R738 315 0431 00 RES FXD CMPSN...

Page 107: ...XD CMPSN 200 OHM 5 0 25W 01121 CB2015 R793 321 0159 00 RES FXD FILM 442 OHM 1 0 125W 91637 MFF1816G442R0F R796 321 0157 00 RES FXD FILM 422 OHM 1 0 125W 91637 MFF1816G422R0F R799 315 0332 00 RES FXD CMPSN 3 3K OHM 5 0 25W 01121 CB3325 R801 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R802 321 0225 00 RES FXD FILM 2 15K OHM 1 0 125W 91637 MFF1816G21500F R803 315 0101 00 RES FXD CMPSN 100 ...

Page 108: ...75K OHM 1 0 125W 91637 MFF1816G47500F R896 321 0152 00 RES FXD FILM 374 OHM 1 0 125W 91637 MFF1816G374R0F R8981 311 1216 00 RES VAR NONWIR 200K OHM 20 0 50W 01121 11M714 R900 315 0471 00 RES FXD CMPSN 470 OHM S 0 25W 01121 CB4715 R901 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 R902 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 R903 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 011...

Page 109: ...0750 00 RES FXD CMPSN 75 OHM 5 0 25W 01121 CB7505 R1007 317 0510 00 XB020000 RES FXD CMPSN 51 OHM 5 0 125W 01121 BB5105 R1008 301 0104 00 RES FXD CMPSN 100K OHM 5 0 5W 01121 EB1045 R1009 322 0621 00 RES FXD FILM 900K OHM 1 0 25W 75042 CEBT0 9003F R1011 315 0131 00 RES FXD CMPSN 130 OHM 5 0 25W 01121 CB1315 R1012 315 0621 00 RES FXD CMPSN 620 OHM 5 0 25W 01121 CB6215 R1013 315 0621 00 RES FXD CMPSN...

Page 110: ...01K OHM 1 0 125W 91637 MFF1816G30100F R1067 315 0103 00 RES FXD CMPSN 1OK OHM 5 0 25W 01121 CB1035 R1068 321 0222 00 RES FXD FILM 2K OHM 1 0 125W 91637 MFF1816G20000F R1069 317 0511 00 RES FXD CMPSN 510 OHM 5 0 125W 01121 BB5115 R1070 315 0103 00 RES FXD CMPSN 10K OHM 5 0 25W 01121 CB1035 R1071 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R1072 315 0152 00 RES FXD CMPSN 1 5K OHM 5 0 25W ...

Page 111: ...000 B143554 RES FXD FILM 487 OHM 1 0 50W 75042 CECT0 4870F R11S1 323 0166 00 B143555 RES FXD FILM 523 OHM 1 0 50W 75042 CECT0 5230F R1152 323 0172 00 B010100 B039999 RES FXD FILM 604 OHM 1 0 50W 91637 MFF1226G6O4R0F R1152 323 0183 00 B040000 B143554 RES FXD FILM 787 OHM U 0 50W 75042 CECT0 7870F R11S2 323 0177 00 B143555 RES FXD FII i 680 OHM 1 0 50W 91637 MFF1226G681R0F R1154 315 0112 00 RES FXD ...

Page 112: ...2100F R1219 315 0101 00 RES FXD CMPSN 100 OHM 5 0 25W 01121 CB1015 R1221 321 0258 00 RES FXD FILM 4 75K OHM 1 0 125W 91637 MFF1816G47500F R1222 321 0340 00 RES FXD FILM 34K OHM 1 0 125W 91637 MFF1816G34001F R1223 323 0636 07 RES FXD FILM 50K OHM 0 1 0 50W 91637 MFF1226C50001B R1226 311 1226 00 RES VAR NONWIR 2 5K OHM 20 0 50W 32997 3386F T04 252 R1227 323 0280 00 B010100 B010285 RES FXD FILM 8 06K...

Page 113: ...R1341 315 0911 00 RES FXD CMPSN 910 OHM 5 0 25W 01121 CB9115 R1342 315 0332 00 RES FXD CMPSN 3 3K OHM 5 0 25W 01121 CB3325 R1343 321 0250 00 RES FXD FII24 3 92K OHM 1 0 125W 91637 MFF1816G39200F R1344 321 0326 00 RES FXD FILM 24 3K OHM 1 0 125W 91637 MFF1816G24301F R1348 311 1222 00 RES VAR NONWIR 100 OHM 20 0 SOW 32997 3386F T04 101 RI354 321 0085 00 RES FXD FILM 75 OHM 1 0 125W 91637 MFF1816G75R...

Page 114: ...E 7015MEG R1461 321 0347 00 RES FXD FILM 40 2K OHM 1 0 125W 91637 MFF1816G40201F R1462 321 0393 00 RES FXD FILM 121K OHM 1 0 125W 91637 MFF1816G12102F R1463 315 0204 00 RES FXD CMPSN 200K OHM 5 0 25W 01121 CB2045 R1481 323 0140 00 RES FXD FILM 280 OHM 1 0 50W 75042 CECTO 2800F R1482 315 0470 00 RES FXD CMPSN 47 OHM 5 0 25W 01121 CB4705 R1484 323 0140 00 RES FXD FILM 280 OHM 1 O SOW 75042 CECT0 280...

Page 115: ... 125W 91637 MFF1816G39200F R1567 321 0206 00 RES FXD FILM 1 37K OHM 1 0 125W 91637 MFF1816G13700F R1568 315 0823 00 RES FXD CMPSN 82K OHM 5 0 25W 01121 CB8235 R1569 311 0310 00 RES VAR NONWIR 5K OHM 20 0 50W 01121 W 7350A R1570 311 0608 00 RES VAR NONWIR 2K OHM 10 0 75W 01121 W8156 R1571 315 0124 00 RES FXD CMPSN 120K OHM 5 0 25W 01121 CB1245 R1572 321 0243 00 RES FXD FILM 3 32K OHM 1 0 125W 91637...

Page 116: ... 620K OHM 5 0 50W FXD CMPSN 1 5M OHM 5 0 50W FXD CMPSN 1 5M OHM 5 0 50W FXD CMPSN 1 5M OHM 5 0 50W FXD CMPSN 1 5M OHM 5 0 50W FXD CMPSN 3 9K OHM 5 0 25W FXD CMPSN 3 9K OHM 5 0 25W FXD CMPSN 4 7K OHM 5 0 50W FXD CMPSN 330 OHM 5 0 50W FXD CMPSN 15 OHM 5 0 25W FXD CMPSN 1S OHM 5 0 25W FXD FILM 2 49K OHM 1 0 125W FXD CMPSN 1K OHM 5 0 25W FXD FILM 11 3K OHM 1 0 125W FXD FILM 226K OHM 1 0 125W FXD CMPSN...

Page 117: ...0 25W 01121 R1751 315 0220 00 RES FXD CMPSN 22 OHM 5 0 25W 01121 R1752 315 0240 00 RES FXD CMPSN 24 OHM 5 0 25W 01121 R1754 315 0472 00 RES FXD CMPSN 4 7K OHM 5 0 25W 01121 R1755 315 0202 00 RES FXD CMPSN 2K OHM 5 0 25W 01121 R1761 315 0244 00 RES FXD CMPSN 240K OHM 5 0 25W 01121 R1762 321 0222 00 RES FXD FILM 2K OHM 1 0 125W 91637 R1765 311 0609 00 RES VAR N0NWIR 2K OHM 10 0 SOW 73138 R1766 323 0...

Page 118: ... RES FXD CMPSN 3 9K OHM 5 0 25W 01121 CB3925 R1902 315 0753 00 RES FXD CMPSN 75K 0HM 5 0 25W 01121 CB7535 R1903 315 0273 00 XB143850 B149999 RES FXD CMPSN 27K OHM 5 0 25W 01121 CB2735 R1903 315 0104 00 B150000 RES FXD CMPSN 100K 0HM 5 0 25W 01121 CB1045 R1904 315 0562 00 RES FXD CMPSN 5 6K OHM 5 0 25W 01121 CB5625 R1905 315 0223 00 RES FXD CMPSN 22K OHM 5 0 25W 01121 CB2235 R1916 315 0123 00 RES F...

Page 119: ...OHM 5 0 25W 01121 CB3315 R2073 315 0102 00 RES FXD CMPSN IK OHM 5 0 25W 01121 CB1025 R2074 321 0692 00 RES FXD FILM 49 9K OHM 0 5 0 125W 91637 MFF1816G49901D R2075 321 0260 01 RES FXD FILM 4 99K OHM 0 5 0 125W 91637 MFF1816G49900D R2083 315 0181 00 RES FXD CMPSN 180 OHM 5 0 25W 01121 CB1815 R2084 321 0769 03 RES FXD FILM 50 33K OHM 0 25 0 125W 91637 MFF1816D50331C R2085 321 0285 01 RES FXD FILM 9 ...

Page 120: ...TCH LEVER 1 SECT 4 POSN 22 5 DEG 80009 260 1311 00 S1005 260 1312 00 SWITCH LEVER 1 SECT 4 POSN 22 5 DEG 80009 260 1312 00 S10208 LEVEL SLOPE S14001 CAL IN S1420 105 0281 00 B010100 B049999 DRUM ASSY CAM S A TIME DIV AND DELAY TIME 80009 105 0281 00 S1420 105 0470 00 B050000 DRUM ASSY CAM S A B TIME DIV AND A DELAY TIME 80009 105 0470 00 S1460 105 0335 00 B010100 B049999 DRUM ASSY CAM S B TIME DIV...

Page 121: ...55 0078 03 B143430 MICROCIRCUIT LI ML VERTICAL AMPL SEL 80009 U780 155 0049 00 B010100 B049999 MICROCIRCUIT DI SWEEP CONTROL 80009 U780 155 0049 01 B050000 B144849 MICROCIRCUIT DI MONOLITHIC SWEEP CONTROL 80009 U780 155 0049 02 B144850 MICROCIRCUIT DI SWEEP CONTROL W LOCKOUT 80009 U830 155 0078 02 B010100 B143429 MICROCIRCUIT LI ML VERT AMPL SELECTED 80009 U830 155 0078 03 B143430 MICROCIRCUIT LI ...

Page 122: ...152 0127 00 SEMICOND DEVICE ZENER 0 4W 7 5V 5 04713 1N958B VR844 152 0175 00 SEMICOND DEVICE ZENER 0 4W 5 6V 5 80009 152 0175 00 VR1131 152 0175 00 SEMICOND DEVICE ZENER 0 4W 5 6V 5 80009 152 0175 00 VR1549 152 0243 00 SEMICOND DEVICE ZENER 0 4W 15V 5 80009 152 0243 00 VR1740 152 0280 00 SEMICOND DEVICE ZENER 0 4W 6 2V 5 80009 152 0280 00 VR1831 152 0401 00 SEMICOND DEVICE SILICON 3 LAYER TRIGGER ...

Page 123: ...umber indicated in hexagon Connection soldered to circuit board Connection made to circuit board with interconnecting pin Blue tint encloses components located on circuit board The following prefix letters are used as reference designators to identify components or assemblies on the diagrams A Assembly separable or repairable circuit board etc AT Attenuator fixed or variable B Motor BT Battery C C...

Page 124: ...C 50ft ATTENUATOR 80 TYPE485 1193 20 Located on back of board S125 C104 R127 not used on A6 board 4L IT Fig 8 1 AS A6 50 Attenuator board Fig 8 2A A3 Hi Z Attenuator board 485 485 1 only SN B155790 up See Parti List for serial numbor ranges ...

Page 125: ... for serial number ranges Fig 8 2C A4 Low 2 Control board 485 2 only C16 P80 P85 R14 P90 P95 REV E MAR 1979 Fig 8 28 A A3 Hi 2 Attenuator board 485 485 1 only SN B010100 8155789 Soe Part List for serial number ranges ...

Page 126: ... Cl PROM f V cc c tt J ftS P 5 fo O P 5fcO l l c C H k 5 pI I tS I cm P A R T IA L 50X1 SOARD 1 R84 C S M AY ae tONMScV O TO 6tTHERV5V Ott SV t3 T OB SWITCHED GND FR O M V E R T MODE S IS 8 0 4 6 S O S C IL L O S C O P E 1193 REV H jM A R 1973 CH 1 ATTENUATORS CHI Z j CH z i d e n t i c a l v TR AC E ID 6N T TO R28S CH I R 3 8 l CHE ...

Page 127: ...L SIGNAL TO VERT PREAMP Q SWITCHED GND FROM VERT MODE SI5BO PAR TIAL so n y B OARD CH 1 ATTENUATORS CH 2 IC jE N T IC L CLO ZJ j TRACE IDENT TO RZBSCMI v RS8C I C U Z ll9 6 3 g M A R 1979 4 8 S O S C IL LO S C O P E ...

Page 128: ...485 R485 Service MAR 1979 5 m V B A L ADJ ...

Page 129: ... J JO W R328 R325 R320 M 8 5 0 siwin m m j C 2 5 3 I n I IS C 2 1 1 C 2 5 4 iS P 2 C W L j W c8 i m SML2 4 2 p P f f l r a l l m 2 1 S 0 2 8 i 2 4 o 0 f R2 6 9 t o o u i m 0 c m c n m w R2 6 6 fj2 2 7 2 fi v 2 w R 2 2 5 n 8 S 5 g g c 2 2 3 R2 2 3 C 2 0 1 C 3 3 4 i See Parts List fo r serial number ranges INV GAIN ADJ INPUT ADJ ...

Page 130: ... TO PIN I U A I O H oV 9V INVERT GAIN RS2S 4 0IK t V r i T T n r t e i r E i CH Z T G A IN m CH 2 POLARITH 53 0 P5I0 9V R3 200 v9V R327 4 8IK R323 S fcX f 9V T l i 4 OP INVERT W V C3I9 X R3 9 022 T 4 32 P 3I0 I 9 INVERT I f e IK 31R302 1 U H t o f z J30 S IG N A L fro m S9S S 4 8 5 f3 7rvi A 0 7V ICR3Q21 lAA C3I7 JL R3H 022 4 32K P300 R3i I 21K R328 2 K t J 24V a ogv T j f l C V C333_l i5 8K F320 ...

Page 131: ...2 R424 R423 U430 R434 M L l R441 u R436 C458 D CQ436 R435 Q 4 4 0 S R458 R437 Q444 Q454 R465 Q 462q c lO CD S fe 2 0 4 6 0 OGC R468 M A IN V E R T G A IN T P 418 T P 419 POS C T R A D J r i e v J tjtsm Fig 8 4 A 7 Partial Vertical am plifier board R E V C SEPT 1974 See Parts List for serial num ber ranges POS C T R A D J ...

Page 132: ...8 CW I VERT SWITCHING LOGIC FROM R srr g CM 2 VERT SW ITC H IN G LOGIC FROM R S 9S 4 6 S O S C IL L O S C O P E CH2 T R I G S G TO PIN 1 SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN BLUE 1193 27 REV F MAR IS73 VERTICAL CHANNEL SW ITCHING ...

Page 133: ...a l d h j in iO R 5 4 g 0 D c o o R563 CR562 In C549 In R 518C 518 l i c C563 Q564 r 8 C 49 R 5 4 2 8 1 rU C 5 6 5 cmoo S S Q 5 5 2 R 5 4 0 J f R 5 6 5 i n R 5 5 0 4 2 C R 5 4 2 co c i n i n ccC557__ 0CR544 0 8 5 a i C C C 5 4 3 R T 5 5 1 R 541 10 R543 C545B538 C538 r 4 7 0 5 4 4 L 5 4 8 R 5 6 0 T R IG G A IN A D J IN T T R IG B A L A D J T R IG G A IN T P 568 ...

Page 134: ... See Parts List for Fig 8 5 A 7 Partial Vertical am plifier board serial num ber ranges R E V D S E P T 1974 ...

Page 135: ...CM I t r i g l o g ic FR O M R IS 98 CH 2 T R IG LOGIC F ro m RI599 8 4 6 S O S C I L L O S C O P E 1193 24 REV E WAR 1973 TR IG G ER A M P LIFIER i SWITCHING 4 EKP ...

Page 136: ...R684U R655 L655 U 6 5 0 c L6tl3 id L651 U660 C655 C696 C M C O CC J625 r C O o R 615 C 615 C D CC R 613C613 C614 5 co R614 O C D C k R609 C609 R608 C608 C607 pg R607R 606g C606 cc C O r J O O O C D C O C O CC O CC R600 S C644 2 s K r 645C648 S rr O 5 L654 s C D 0 K C C 0 68 8 te R686 L698 o C O cc LR656 LR654 R656 R667 R666 C656 L656 co C O cc ID C O CC R658 C697 r co co a C695 CC C698 C699 ID C O...

Page 137: ...Fig 8 6 A 7 Partial Vertical am plifier board See Pgrts Ljsf for serial number ranges f R E V B S E P T 1974 ...

Page 138: ... V S B T U PROM Dl_4IO SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN BLUE 4 8 5 O S C IL L O S C O P E VERTICAL AMPLIFIER s 773 ...

Page 139: ... ro oo r rv rv rv rv OC DC CC CC QC DC C844 R845 U730 C846 J762 c e 3 R751 C761 C847 R812 R811 U738 3 U740 R761 f O V 1 R756 R802 R814 R764 co CO CD h Is o cc Q768 U830 C837 DC EXT TRIG ADJ SEE Q778 to co c m to to r r f t CC oc CC VR839 R827 R771 OUT TD SENS ARM TD OUT TD ADJ ADJ ADJ Q794 Q792 a DC cc C M CO o J814 Q822 C785 U780 ARM TD TP J813 R784 CR784 CR785 R783 R782 1193 32 See Parts List fo...

Page 140: ... R 8 0 2 q b o 2 Q 8 1 0 R 8 1 4 C 8 1 1 U 7 4 0 C 733 C 7 3 4 r 7 3 4 R 7 3 5 R 7 3 2 R812 P C761 c O S R 7 5 6 5 0 8 1 6 Q8041 R811 R761 R 764 CR762 O 11 Q 7 9 4 R 7 7 3 Q 7 9 2 f t II y Q 7 6 8 Fig 8 7B A9 A Trigger board 485 1 2 only j r m R827 R771 R775 R765 S R tD Q 8 2 2 Q 7 7 8 N T r cc cc C 7 8 5 N to N N CO CO cc CC U780 ARMTD ARMTD OUT TD SENS OUT TO T P ADJ ADJ Ar 8 1 4 W 3 R784 CR784 ...

Page 141: ...QQOZ MftK i i K Hi SWP G ATE t o 0 8 5 4 SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN BLUE flii _ r 1 K INT TRIG PROM R 5 5 l in e t r ig s ig p r o m R lB O fc A R70I r rT r _ 2 r ig I Q W v k m o jtrig JT O I X X trig IsOURCE V 5 3 r 8 a o 2 4 0 VJ3V t a c p O o CL W J8A3 5 TR IG TO K4 iO S2j 3 1 C8S ooi 5 V T0 ST20 PARTIAL AB A TRIG GER b O A k b t...

Page 142: ... Q854 0960 R948 2 Q904 Q942 Q944 Q866 R942 Q906 R905 R945 R944 Q896 R868 Q868 CR868 R857 R862 DELAY START ADJ DELAY STOP C877 ADJ A sweep IpS timing H PREAMP TP I iWT g s l i t m u m m a i r MXt it J948 R949 R946 C945 1 1 9 3 3 5 See Parts List for serial number ranges Alternate location for some SN REV D AUG 1976 Fig 8 8 A10 Partial Sweep board R863 A sweep linearity C882 A sweep IpS timing ...

Page 143: ... DlSAOi t F R O M Q I S 0 4 S A SWP STOP i O Q8l DELAY PlCKOPF TO R 1 0 9 0 R O D 3 SWP GATE FROM 3 8 0 2 Q 8 0 4 S PEAfO 4 8 5 O S C I L L O S C O P E REV 0JMARI97S 1193 36 A T IM E B A S E GENERATOR 7 ...

Page 144: ...R1073 co R1JJ2 81068 R1066 R1115 8 1 R1 1 0 6 81111 C C R 1076 Q1068 C C CR1121 J R1074 C1079R R1 07901074Q 107 R1119 R1116 o C l121 U 1038 O S 8 0 R 0 M 5 R 1011 C1015 R1017 C1011CR1011 C1030 R1032 R 1033 R1030 R1031 C l 134 Q1084 81087 R1071 C l 072 R1072 R1085 R1084 R 1092 Q1082 Q1092 C l 137 C1043 C l 046 Added to back of board Q1096 L c m r 00 CC o R1067 R1075 R 1065 Q1108 C1130 R1104 R1103 q...

Page 145: ...Fig 8 9 A l l Partial Horizontal amplifier board REV E AUG 1975 See Parts List for serial number ranges ...

Page 146: ...GER LEVEL 0 DTP 1 TIME DIV 1 m 1 4 div of 1 kHz Cal Signal MOTE PART OF ETCHED CIRCUIT BOARD SUB STR ATE SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN BLUE C a TRIO S O U R C E SIOOOA B sweep stop FROM R I L T I 1198 38 REV F AUG 1977 g e n e r a t o r ngf 7 7 3 4 8 5 O S C IL L O S C O P E ...

Page 147: ...1 R1272 CR1204 C1204 R1204 R1239 R1203 Q1218 R1218 R1221 CR1221 C l 268 CR 1272 CR1273 R 1263 C l 247 Q1222 01268 R1267 R 1268 K1242 R1266 C l 243 3R1206 R1228 CR1 1193 39 C l 248 C l 242 See Parts List for serial number ranges 2 ns 1 nS ADJ ADJ REV D AUG 1977 Fig 8 10 A10 Partial Sweep board ...

Page 148: ... SWP GATE FROM RII2 S SWP GATE FROM RIIZ8 5 4 8 5 O S C IL LO S C O P E 1145 40 REV E AUG I9TT B TIME BASE GENERATOR EKP ...

Page 149: ... switch board 0 r I t O 2 01 m O O z C O o 7s o n co O 00 T m T n T O T I o R 1437 C1432 0 1 4 3 1 R1431 CR1431 R 1422 R 1421 R1419 R 1418 M i n t R1416 R1415 R 1414 R1413 R1412 R1411 R141Q o o O W O CO U1 v m n 2 00 4 w 00 o T 7s ...

Page 150: ... D F j R1333 P iW R1307 h Fig 8 12 A10 Partial Sweep joard R E V C S E P T 1974 13 V N 0 P C l 364 R1366 Q1372 R1364 R1372 C1372 R1365 R1374 01374 R1375 C1374 Q1358 Q1318 H I 0 0 C O rt i o r r CR1336 18 8 P 1356 Q1338 2 g CR1321 t r t c n Q1312 u O J R 1321 Q1322 CR1311 R1313 R1314 J1346 S B jjp S B R1355 A CAL ADJ See Parts List fo r serial number ranges X Y PHASING ADJ X Y CTR ADJ ...

Page 151: ...1 156 CR1166 Q H 6 4 L 1 1 5 7 R1166 O to o C l 156 R1168 R1165 CR1168 R1197 R 1188 R 1198 C l 182 R1164 R 1177 R 1174 Q1192 c i 177 R1192 R 1196 Q1196 R1184 C l 187 R1187 Q1174 R1179 C l 174 C l 184 R 1189 C l 199 I 33 m m 01 CD w i Q1168 C l 164 R1169 C l 181 D A Q1184 33 00 00 ro R1181 ro 0 o T T R1183 D O m 00 m o H _ i 0 31 5 00 co 0 C D ST I o N o 3 f 2L a 3 o C D O o 0 P1788 P1786 ...

Page 152: ... 0 iT s i ...

Page 153: ...W H I T C X Y I6 J ROM Q S X J I 4 8 5 O S C U L O C O P E II93 4S REV D A J l 57fe HORIZONTAL A M P L IF IE R U ...

Page 154: ...566 R1568 R1589 R1585 CR1585 R1588 U 1VR1587 C1586 Q1582 R1586 U1585 U1580 U1530 C1579 R1501 R1531 CR1581 R1581 R1584 CR1582 CR1538 CR1584 Q1504 CR1504 CR1531 R1517 CR1530 CR 1536 tl U a d r v h A 4 i j l i t e t i F i M M 4 ife r fg 1 f J 1SL UlFv fffelW K U l at jrn v m 1 3Sii K I a m t a f f C i J a S g S S 3 S 1 0 t C1551 R1551 C1552 R1552 M AX Z ADJ R E V B SEPT 1974 Fig 8 14 A13 Partial Powe...

Page 155: ...To e A 5 E T QC 06 H O P ZC M T U t T O K M S C H I T P G LO C TO T H lO U C TO 9 3 4 8 5 08CJLLOSC0PE ftEV F AUGr 1977 1193 47 LOGIC ...

Page 156: ...8 R1781 Q1718 R1782 01732 01728 R1717 Q1772 01716 R1709 CR1710 R1710 R1715 R1766 LI 748 U1710 R1704 R1701 R1702 Cl 742 R1700 FOC GAIN ADJ MAX FOC ADJ C1782 R1737 CR1735 R1715 R1714 R1711 R1712 o l r i x V Jjg o 1193 48 REV D MAR 1978 Fig 8 15 A13 Partial Power Supply board ...

Page 157: ...63 R4668 L CR1660 u CR1656 C1660 Cl788 R16271 01827 I S R 1 R 2 5 R 1 R f i I I R1f 5 R1626 U1624 tc It i I CR1627 S 1 L J CR1626 Q1618 f v 4 i c C OC1621 K S 5 1622 g O S ft S a I R1616 CR1652 lQ TP1653 R1633 C l664 C1646 R164 C 1 6 5 i 0 1 6 5 2 R1642 C l633 J R1613 C1612 R1614 C1611 C l56 1193 49 3000 V TEST PO N marVed 2950 w so1 instruments CATH REG ADJ FIG 8 16 A ll Partial Horizontal amplif...

Page 158: ...1601 R16 8 coQ R1603 R1609 R1604 R1606 CR1601 R1605 Fig 8 17 CR1602 m m A15 Partial Transformer board 1193 50 Refer to diagram R1687 DS1687 R2096 N C O C1603 S 1193 51 N I Fig 8 18 A15 Transformer board ...

Page 159: ...OSCILLOSCOPE 3 0 0 0 V TE ST P O IN T M AR K E D 2 9 5 0 V IN SOME INSTRUMENTS R EV e M AR 19 70 7 93 52 MRS ...

Page 160: ...918 o CR1923 t R1940 2 CR1924 U R1925 C1912 CR1925 C1921 o f j R1921 o C1919 S i 3 R1919 R1943 C1943 R1924 VR1928 C1902 C1904 C1901 R1901 R1904 C l 924 R1956 R1953 R1955 R1957 R1954 R1951 O CR1931 CR1932 CR1933 CR1934 See Parts List for serial number ranges Fig 8 19 A13 Partial Power Supply board REV E MAR 1977 ...

Page 161: ...l 835 Cl 834 R1834 R1R1848 L I835 Cl 848 R1847 VR1846 Q1846 R1846 CR1843 Q1840 CR1842 R1841 TP1835 CR1834 I cc O rNJj CO C M CO 00 CO i 2 O R1824 O DS1824 C C o I RT1822 W T1801 Q R1804 r R1805 R1806 CM CM 00 r O ___ R1802 R1822 DS1802 R1828 I RT1821 cR182n Fig 8 20 A14 Inverter board 1193 55 ...

Page 162: ...t r a n s f o r m e r B o a r d C 84 4 7 p n h 01844 _ P RI84I I CR1842 0 8 4 0 c ia W CRI84S TPIBAA W 6 0 Q 184 S u p p o r t p o s t R I8 G 1 A70 VOLTAGE CONDITIONS B TIME DIV 0 1 ms A TIME DlV 1 ms HORIZ DISPLAY ALT SWEEP MODE NORM A TRIGGER SOURCE INT A TRIGGER COUPLING AC B TRIGGER SOURCE B RUNS AFTER DELAY TIME HORIZ POSITIONING MIDR CRI10I RI90I 3 3 k CI3 IJ j 1 7 mT Ql iOZ RI704 5 tic C t4...

Page 163: ... C2012 CR2012 CR2038 C2039 C2018 C2036 C2076 R2072 R2056 Q2046 U2052 U2042 C2047 C2042 o R2048 R2042 U2072 U2086 Q2086 R2085 R2084 R2083 R2051 R2071 R2086 VR2042 v 35 rs R2074 R2049 C2086 C2087 P1590 R2087 PI 5 0 0 PI 580 U2062 See Parts List for serial number ranges 59 4 V TP 25 V TP 5 5 V TP 5 V 50 V Tp ADJ REV B SEPT 1974 Fig 8 22 A13 Partial Power supply board ...

Page 164: ...2S2 n eKn s e s 5 4 85 Os c illo sc o p e REV F A U S 1 9 7 7 I 1 9 3 5B POWER SUPPLY 773 ...

Page 165: ...C 1 4 M U 1 4 8 d R 1 4 8 1 482 g g g 1484 S f Q1482 5 CR1492 I l S S r R 1 4 8 2 CCCCR1491 RX1487 RI486 CR1495 R1497 R1487 C l482 B1480 u W i W I Fig 8 23 A12 Partial Timing switch board ...

Page 166: ...CAL 5 V AOJ 1 kHz ADJ 1 MHz ADJ R2130 R2100 R2105 R2101 R2139 C2109 R2108 R2102 R2107 Q2106 Q2112 R2112 Q2124 Q2114 R2124 Q2124 R2134 L2117 Fig 8 24 A10 Partial Sweep board ...

Page 167: ...PK 7 v PARTIAL AI2 TWAINS BOARD A 8 5 O S C I L L O S C O P E REV B AU I9TS I I 9 3 I CALI BR ATOR AND FAN ClfcCU T g 4 e It H ...

Page 168: ... O I P 4 c N ifl 0 t 4 8 5 O S C I L L O S C O P E 2 d2 2 m u J tP Z O u u r 7 OJO d U O Hi 0u o o J ...

Page 169: ...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 170: ... CONTROLS DIV LEXINGTON PLANT WECKESSER CO INC INDUSTRIAL RETAINING RING CO RUBBER TECK INC 103 SE TAYLOR 2015 2ND STREET P 0 BOX 3608 PORTLAND OR 97219 BERKLEY CA 94710 HARRISBURG PA 17105 P 0 BOX 5012 13500 N CENTRAL EXPRESSWAY 343 SNYDER AVENUE 2015 D AUDUBON ROAD DALLAS TX 75222 BERKELEY HEIGHTS NJ 07922 LA VERNE CA 91750 WAKEFIELD MA 01880 446 B1AKE ST 525 S WEBSTER AVE 7100 LAMPSON AVE 9301 ...

Page 171: ...TSCREW 5 40 X 0 125 INCH HEX SOC STL 74445 OBD 14 366 0215 02 7 KNOB LEVER SWITCH 80009 366 0215 02 15 366 0494 00 1 KNOB GRAY 80009 366 0494 00 213 0153 00 1 SETSCREW 5 40 X 0 125 INCH HEX SOC STL 74445 OBD 16 366 0494 00 1 KNOB GRAY 80009 366 0494 00 213 0153 00 1 SETSCREW 5 40 X 0 125 INCH HEX SOC STL 74445 OBD 17 366 1391 00 1 KNOB GRAY 80009 366 1391 00 213 0239 00 1 SETSCREW 3 48 X 0 062 INC...

Page 172: ... 210 0471 00 55 210 0223 00 1 TERMINAL LUG 0 25 INCH DIA SE 86928 A313 136 56 260 0735 00 1 SWITCH PUSH SPST 81073 39 1 57 1 1 RES VAR SEE R920 EPL 58 1 RES VAR SEE R720 EPL ATTACHING PARTS 59 210 0583 00 1 NUT PLAIN HEX 0 25 32 X 0 312 INCH BRS 73743 2X20224 402 60 260 0816 01 1 SWITCH SLIDE DPDT 0 5A 125V 80009 260 0816 01 ATTACHING PARTS 61 210 0405 00 2 NUT PLAIN HEX 2 56 X 0 188 INCH BRS 7374...

Page 173: ...TERLOCK 80009 260 1317 00 ATTACHING PARTS 99 220 0413 00 2 NUT SLEEVE 4 40 X 0 562 INCH LONG 80009 220 0413 00 100 366 1351 08 1 PUSH BUTTON A 80009 366 1351 08 101 366 1351 06 1 PUSH BUTTON INTEN 80009 366 1351 06 102 366 1351 05 1 PUSH BUTTON ALT 80009 366 1351 05 103 366 1351 15 1 PUSH BUTTON B 80009 366 1351 15 104 260 1318 00 1 SWITCH PUSH 4 BUTTON 2 POLE INTERLOCK 80009 260 1318 00 ATTACHING...

Page 174: ... BOTTOM 80009 337 1478 00 ATTACHING PARTS 128 211 0116 00 B010100 B019999 4 SCR ASSEM WSHR 4 40 X 0 312 INCH PNH BRS 83385 OBD 129 __________3 1 CKT BOARD ASSY 50 OHM ATTENDEE A5 A6 EPL 130 129 0317 00 5 POST ELEC MECH 4 40 X 0 187 X 0 125 INCH L 80009 129 0317 00 131 131 0589 00 1 CONTACT ELEC 0 46 INCH LONG 22526 47350 132 131 1003 00 3 CONNECTOR BODY CKT CD MT 3 PRONG 80009 131 1003 00 133 136 ...

Page 175: ...1 1030 00 8 CONT ASSY ELEC CAM SW BOTTOM 80009 131 1030 00 ATTACHING PARTS 210 0779 00 8 RIVET TUBULAR 0 051 OD X 0 115 INCH LONG 42838 RA 29952715 167 131 1134 00 9 CONTACT ELEC CKT CARD TO SHIELD 80009 131 1134 00 168 407 0803 00 1 BRACKET CMPNT 80009 407 0803 00 351 0180 00 B020000 1 SLIDE GUIDE SWITCH ACTUATOR 80009 351 0180 00 337 1477 00 B020000 1 SHLD ELECTRICAL ATTEN TOP 80009 337 1477 00 ...

Page 176: ...CAM SW CENTER 80009 401 0115 00 199 105 0283 00 1 DRUM CAM SWITCH 80009 105 0283 00 198 3047 00 1 WIRE SET ELEC ATTENUATOR ASSEMBLY 80009 198 3047 00 210 0774 00 3 EYELET METALLIC 0 152 OD X 0 245 INCH L BRS 80009 210 0774 00 210 0775 00 3 EYELET METALLIC 0 126 OD X 0 23 INCH L BRS ATTACHING PARTS FOR EACH 80009 210 0775 00 200 210 0590 00 2 NUT PLAIN HEX 0 375 X 0 438 INCH STL 73743 2X28269 402 2...

Page 177: ...ELET METALLIC 0 152 OD X 0 245 INCH L BRS 80009 210 0774 00 210 0775 00 4 EYELET METALLIC 0 126 OD X 0 23 INCH L BRS 80009 210 0775 00 352 0197 00 2 CONN BODY PL EL 1 WIRE BLACK 80009 352 0197 00 179 1738 00 1 WIRING HARNESS POT CABLE 80009 179 1738 00 131 0707 00 10 CONNECTOR TERM 0 48 L 22 26AWG WIRE 22526 75691 005 352 0197 00 1 CONN BODY PL EL l WIRE BLACK 80009 352 0197 00 179 1734 00 1 WIRIN...

Page 178: ......

Page 179: ...485 R485 OSCILLOSCOPE REV D MAR 1977 ...

Page 180: ...INCH DIA PLASTIC 80009 124 0092 00 1 TERMINAL BOARD 3 NOTCH CERAMIC CLIP MTD 80009 355 0046 00 1 MOUNT TERM BD 0 577 INCH H 80009 ATTACHING PARTS 361 0007 00 1 SPACER SLEEVE 0 250 INCH DIA PLASTIC 80009 19 136 0328 02 B010100 B1429S5 2 SOCKET PIN TERM HORIZONTAL 00779 136 0328 03 B142956 2 SOCKET PIN TERM HORIZ SQ PIN RCPT 22526 20 136 0461 00 8 SKT PL IN ELEC CKT CARD CONTACT 80009 343 0043 00 3 ...

Page 181: ...0009 214 0579 00 43 200 1167 00 1 COVER XSTR TEMP STAB FOR 2 TO 18 CS STYLE 80009 200 1167 00 ATTACHING PARTS FOR CKT BD 44 211 0007 00 4 SCREW MACHIME 4 40 X 0 188 INCH PNH STL 83385 OBD CKT BOARD ASSY POWER SUPPLY SEE A13 EPL TERMINAL PIN 0 365 L X 0 25 PH BRZ GOLD PL 46 131 0608 00 35 22526 47357 47 131 1003 00 4 CONNECTOR BODY CKT CD MT 3 PRONG 80009 131 1003 00 48 136 0183 00 6 SOCKET PLUG IN...

Page 182: ...331892 5 80 136 0263 04 5 SOCKET PIN TERM FOR 0 025 INCH SQUARE PIN 22526 48059 81 1 TRANSISTOR SEE Q1834 EPL ATTACHING PARTS 82 210 0586 00 1 NUT PLAIN EXT W 4 40 X 0 25 INCH STL 78189 OBD 83 355 0518 02 1 STUD SELF LKG 4 40 X 0 625 INCH LONG BRS 80009 355 0518 02 337 1498 00 B010100 B091550X 1 SHIELD TSTR TO 3 TOP 80009 337 1498 00 ATTACHING PARTS 210 0586 00 B010100 B091550X 1 NUT PLAIN EXT W 4...

Page 183: ...CAL BOARD 80009 198 2785 00 ATTACHING PARTS FOR CKT BD 111 211 0207 00 14 SCR ASSEM WSHR 4 40 X 0 3 12 INCH PNH STL 83385 OBD 112 1 CKT BOARD ASSY HORIZONTAL AMP SEE A l l EPL 113 124 0158 00 1 TERMINAL BOARD 7 NOTCH MINI 80009 124 0158 00 114 355 0046 00 2 MOUNT TERM BD 0 5 77 INCH H 80009 355 0046 00 ATTACHING PARTS 115 361 0007 00 2 SPACER SLEEVE 0 2 5 0 INCH DIA PLASTIC 80009 361 0007 00 116 1...

Page 184: ...REV C MAR 1976 485 R485 OSCILLOSCOPE ...

Page 185: ...9 214 1139 02 214 1139 03 B010100 B049999 1 SPRING FLAT RED COLORED 80009 214 1139 03 143 214 1127 00 B010100 B049999 2 ROLLER DETENT 0 125 DIA X 0 1 25 INCH L 80009 214 1127 00 144 401 0081 02 B010100 B049999 1 BEARING CAM SW FRONT 80009 401 0081 02 ATTACHING PARTS 145 354 0391 00 B010100 B049999 1 RING RETAINING 0 395 FREE ID X 0 0 2 5 STL 97464 3100 43 CD 1 46 40 7 0926 00 B010100 B049999 1 BRA...

Page 186: ...0963 00 B050000 1 CONTACT ELEC GROUNDING 80009 131 0963 00 178 210 0406 00 B050000 3 N U T PLAIN H EX 4 40 X 0 1 8 8 INCH BRS 73743 2X12161 402 179 214 1139 02 B050000 1 SPRING FLAT GREEN COLORED 80009 214 1139 02 214 1139 03 B050000 1 SPRING FLAT RED COLORED 80009 214 1139 03 180 214 1127 00 B050000 2 ROLLER DETENT 0 1 25 DIA X 0 1 25 INCH L 80009 214 1127 00 181 401 0081 02 B050000 i BEARING CAM...

Page 187: ...19 388 2667 00 i CKT BOARD MOTOR INTERCONN 80009 388 2667 00 220 337 0717 00 i SHIELD CKT BD HORIZONTAL AMPLIFIER 80009 337 0717 00 ATTACHING PARTS FOR CKT BD 211 0207 00 6 SCR ASSEM WSHR 4 40 X 0 312 INCH PNH STL 83385 OBD 221 386 2228 00 16 SUPPORT CKT BD PLASTIC 80009 386 2228 00 222 1 RES FXD SEE R691 EPL ATTACHING PARTS 223 211 0559 00 2 SCREW MACHINE 6 32 X 0 375 100 DEG FLH STL 83385 OBD 22...

Page 188: ...09 200 0608 00 255 1 RES VAR SEE R1640 EPL ATTACHING PARTS 256 210 0583 00 2 NOT PLAIN HEX 0 25 32 X 0 312 INCH BRS 73743 2X20224 402 257 210 0223 00 i TERMINAL LUG 0 25 INCH DIA SE 86928 A313 136 258 _____ _____ i RES VAR SEE R1799 EPL ATTACHING PARTS 259 210 0583 00 2 NOT PLAIN HEX 0 25 32 X 0 312 INCH BRS 73743 2X20224 402 260 210 0046 00 1 WASHER LOCK INTL 0 26 ID X 0 40 OD STL 78189 1214 05 0...

Page 189: ...ARTS FOR EACH 289 211 0631 00 i SCREW MACHINE 6 32 X 2 INCH FLH STL 83385 OBD 290 166 0424 00 i SPACER SLEEVE 0 18 ID X 0 25 OD X 0 171 80009 166 0424 00 119 0346 00 i FIL LINE ASSY 80009 119 0346 00 291 i CKT BOARD ASSY LINE FILTER SEE A16 EPL 292 343 0088 00 i CLAMP LOOP 0 062 INCH DIA 80009 343 0088 00 293 346 0032 00 3 STRAP RETAINING 98159 2829 75 4 198 0689 00 1 WIRE SET ELEC FILTER RFI 8000...

Page 190: ...104 04 00 2520N ATTACHING PARTS 307 211 0007 00 1 SCREW MACHINE 4 40 X 0 188 INCH PNH STL 83385 OBD 308 210 0406 00 1 NUT PLAIN HEX 4 40 X 0 188 INCH BRS 73743 2X12161 402 309 380 0252 00 1 HSG LINE FILTER 80009 380 0252 00 ATTACHING PARTS FOR ASSY 310 211 0007 00 5 SCREW MACHINE 4 40 X 0 188 INCH PNH STL 83385 OBD 311 352 0326 00 1 FUSEHOLDER PLASTIC 80009 352 0326 00 9 19 REV A MARCH 1976 ...

Page 191: ...ROUND 80009 13 348 0080 00 4 FOOT CABINET 0 700 DIA X 0 500 LG PLASTIC 80009 14 334 1934 00 1 PLATE IDENT 80009 016 0558 00 1 ADPTR RACK MTG KIT 80009 15 367 0022 00 2 HANDLE BOW 1 5 X 4 5 INCH 06540 ATTACHING PARTS FOR EACH 16 213 0090 00 2 SCREW MACHINE 10 32 X 0 50 INCH HEX 83385 17 361 0528 00 2 SPACER BAR RACK MOUNTING 80009 ATTACHING PARTS 18 211 0517 00 2 SCREW MACHINE 6 32 X 1 INCH PNH STL...

Page 192: ...076 00 1 CABLE ASSY RF 50 OHM COAX W BNC EA END 20 L 80009 012 0076 00 4 012 0092 00 2 ADAPTER CONN 80009 012 0092 00 5 011 0049 01 2 NTOK IMPD MATC 50 OHM FEEDTHRU 80009 011 0049 01 070 1194 00 1 MANUAL TECH OPERATORS 80009 070 1194 00 070 1193 00 1 MANUAL TECH INSTRUCTION 80009 070 1193 00 386 0118 00 1 SHIELD IMPLOSION 80009 386 0118 00 159 0015 00 4 FUSE CARTRIDGE 3AG 3A 250V FAST BLOW 71400 A...

Page 193: ...ince the change inform ation sheets are carried in the manual until all changes are permanently entered some duplication may occur If no such change pages appear follow ing this page your manual is correct as printed SERVICE NOTE Because of the universal parts procurem ent problem some electrical parts in your instrum ent may be different from those described in the Replaceable Electrical Parts Li...

Page 194: ...tude 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 06...

Page 195: ...ION EFF SN B155790 ELECTRICAL PARTS LIST AND SCHEMATIC CHANGES CHANGE TO A3 R1 ADD Q1 R4 R5 REMOVE C4 670 1512 02 CKT BOARD ASSY HI Z 485 485 1 317 0047 00 RES FXD CMPSN 4 7 OHM 5 0 125W 151 0188 00 TRANSISTOR SILICON PNP 2N3906 315 0681 00 RES FXD CMPSN 680 OHM 5 0 25W 315 0752 00 RES FXD CMPSN 7 5K OHM 5 0 25W 283 0204 00 CAP FXD CER DI 0 01UF 20 50V ...

Page 196: ...SSY WITH ADAPTER BOARD CAP FXD CER DI 1PF 0 25PF 500V R1 and RSI are removed from the A3 or AA boards and mounted on an adapter board The adapter board connects with wire leads and soldered connections to original R1 and RSI mounting points on the A3 or AA board Cll is added to the A3 or AA board This affects A3 CH 1 and CH 2 HI Z attenuator boards or AA CH 1 and CH 2 LO Z attenuator boards see pa...

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