Tektronix 485 Instruction Manual
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Tektronix 485 Instruction Manual

Tektronix 485 Instruction Manual

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TEKTRONIX®
4 8 5 / R 4 8 5
O S C IL L O S C O P E
S E R V I C E
IN S T R U C T IO N
M A N U A L
T ektro nix, Inc.
P .0 . Box 500
Beaverton, Oregon
9 7 0 0 5
Serial Number
473
070-1193-00

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Summary of Contents for Tektronix 485

  • Page 1 TEKTRONIX® 4 8 5 / R 4 8 5 O S C IL L O S C O P E S E R V I C E IN S T R U C T IO N M A N U A L T ektro nix, Inc.

  • Page 2: Table Of Contents

    RACKMOUNTING Inverter Current Limiting Circuit Overvoltage Stop Circuit Introduction Line Stop Circuit and Surge Limiting Rack Dimensions Procedure for Converting the 485 to Slide Out Tracks DC Operation Mounting Procedure Low Voltage Supplies Alternate Rear Mounting Methods Removing or Installing the Instrument...
  • Page 3 485/R485 T h * « 5 ' “ 0 :rvi O scil'osco p e .

  • Page 4: Specification

    (DC to 350 MHz bandwidth with 50 £2 input impedance; DC to 250 MHz bandwidth with 1 M£2 input Lower —3 dB Point (AC coupling from 50 £2 impedance). The 485 has a 1 ns sweep rate, stable triggering source) bandwidth limits and calibrated X-Y capabilities.
  • Page 5 5 V RMS continuous or 0.1 watt-second for instantaneous voltages of 5 V to 50 V. A Ext Trigger Display (R485 and 485 only) Repeated application of voltages in excess of 50 volts and greater than 0.1 watt-second will cause deterioration Momentary pushbutton in VERT MODE area enables of K1S1 relay contacts, due to arcing.

  • Page 6: Probe Performance

    Specification— 485/R485 Service PROBE PERFORMANCE (Probes are Optional Accessories) Temperature Range Lower Bandwidth for this Input — 3 dB point with 485 Bandwidth Type Atten. Impedance (maximum) (minimum) Specification For Use With 50 $2 Input 010-6056-03 - 6 f t .

  • Page 7: Horizontal Deflection

    Specification—4 8 5 /R 4 8 5 Service Minimum Sweep Holdoff (A Trigger Holdoff in B Source Norm detent) B runs after Delay Time, Internal, External, External A Time Setting •MO. 1 ns/div to 0.1 ps/div Less than 0.4 ps. External Inputs 0.2 ps/div Less than 1.0 ps.

  • Page 8: Crt

    A t least 3 div/ns for standard P31 phosphor; at least 6 div/ns optional phosphor (with TEKTRONIX C-31-R Camera and POLAROID 10,000 ASA film ). DIFFERENCE Between Two Dial Readings, Major D.T.P. Divisions Fig. 1-3. Specified Differential Delay Accuracy vs. Size of Measure­...

  • Page 9: Calibrator

    12 shocks. 450 S 2 Risetime Electromagnetic Interference Positive edge into 50 £1, less than 1 ns. Overshoot and (With 485 EMI modification option 4). Meets inter­ ringing less than 2% into 50 at 1 GHz bandwidth. ference requirements...

  • Page 10: General

    A thermal cutout in this instrument provides thermal protection and disconnects the power to the instrument if The 485 can be operated from either a 115 V or 230 V the internal temperature exceeds a safe operating level. nominal line voltage source, or a 220 V external battery Power is automatically restored when the temperature pack.
  • Page 11 Pushbutton display the external signal being VERT MODE (momentary not on used for A sweep triggering. Pushbutton Selector 485-1 and 485-2) CH 1 Displays Channel 1 only. 1 MS2/50 SI Switch, Illuminated push-push selection for Dual trace display by switching CH 1 and CH 2 input impedance.
  • Page 12 Operating Information— 485/R485 Service CH 2 POLARITY +UP and INVERT slide selector DC (direct) couples all trigger sig­ nals to the trigger circuitry. Switch provides for inverting CH 2 display. HORIZ DISPLAY (Inoperative in the X-Y, VERT EXT TRIG Input...

  • Page 13: Rear Panel

    Two types o f c rt graticules have been used in some coincident with B sweep. Tektronix oscilloscopes. One graticule has 0% and 100% risetime reference points that are separated by A +GATE c o n n e cto r providing 6 vertical graticule divisions.

  • Page 14: Circuit Description

    This section describes the electrical operation and output, J70. C46 matches the time constant of C77 and relationship of the circuits in the Type 485. The theory of R75 with the time constant of R42 and parallel combina­ operation for circuits that are used only in this instrument tion of C46 and C47.

  • Page 15: Signal Channel Switch

    Circuit Description—4 8 5 /R 4 8 5 Service stages U310 through Q564. Q552 and Q556 select the of U350. Other S95 contacts (shown on schematic 4) close bandwidth of the trigger signal. to maintain the voltage at outer collectors pins 5 and 9 of U350.

  • Page 16: Scale Factor Readout

    SCALE FACTOR R EA D O U T The Source Switch SW700 selects one of the four modes which the 485 will trigger on: INT, LINE, EXT, or EXT + Scale factor readout control circuitry is in U80. With a 10.

  • Page 17: A Trigger Generator

    Circuit Description—4 8 5 /R 4 8 5 Service In the triggerable mode, the B Trigger Generator triggers A TR IG G E R G ENERATO R only after receiving both the delay pickoff and A Gate signals. Delay pickoff gate drives comparator Q1092 and The trigger amplifier drives a Schmitt Trigger circuit Q1096.

  • Page 18: Horizontal Amplifier

    Circuit Description— 485/R485 Service Q908 disables B Sweep in A HORIZ DISPLAY mode and Q1362 and Q1364 compose a HI gain amplifier. The Q914 introduces an offset at 10 and 20 ns/div. Switch A9 feedback R is R1364 and R1366. The input resistance in B opens when A Sweep speed is 1, 2, or 5 ns/div to start B sweep is R1321 and R1322.

  • Page 19: Power Inverter/Regulator

    Circuit Description— 4 8 5 /R 4 8 5 Service occur during holdoff.) Pin 5 of U1535A alternates from HI Line Input Circuit to LO and the sweep switches from A to B and back again. Thermal cutout S1802 provides thermal protection for When B is called up and pin 5 is HI, the Z AXIS 1C will be this instrument.

  • Page 20: Start Network

    Circuit Description— 485/R485 Service DS1801 and DS1802 are line voltage transient pro­ a nominal resonant frequency of about 25 kilohertz. To tectors. With S I803 in the 115 V position, only DS1801 is provide regulation of the voltages induced in the secondary connected across the line.

  • Page 21: Inverter/Regulator

    Circuit Description—4 8 5 /R 4 8 5 Service 2. At a controlled time after the resonant circuit current multivibrator, pin 9 will be near ground, holding Q1900 passes through 0 ampere, regulator transistor Q1900 is off. As the inverter current goes thru zero, either pin 10 or turned o ff by the Inverter Control circuit.

  • Page 22: Procedure For Converting The 485 To Dc Operation

    (black) must be connected to the positive. The neutral side :C1918 (white) must be connected to the negative. The safety ground must be connected to earth potential. Proper -AAA/— — R1916 polarity at the 485 plug is shown in Fig. 3-4B. LINE LINE STOP STOP TIME SENS 3>...

  • Page 23: Power Supply Protection Circuit

    Circuit Description—4 8 5 /R 4 8 5 Service TP1918 goes positive. CR2042 is short circuit protection for I---------------------- 1 U2042. p in JO OFF U1910 +9 V Supply O ON I______ ---------- 1 The 9 V supply is re-regulated from the +15 V supply by Q2056.

  • Page 24: Balance Node

    Circuit Description— 485/R485 Service provides over current protection for the H.V. winding of Balance Node T1960 and beam current protection for the CRT. Pin 2 of U1910 is the input to the voltage balance amplifier. If the The Balance Node provides short circuit protection for voltage at pin 2 of U1910 is more positive than +200 mV or all semi-regulated and regulated DC voltages.

  • Page 25: Overcurrent Protection

    Circuit Description—4 8 5 /R 4 8 5 Service more negative than — 200 mV, the output will generate an CRT C IR C U IT error to stop the Inverter. Under normal operating condi­ tions, current from positive supplies to the Balance Node General will equal current to the negative supplies, allowing pin 2 to The CRT Circuit produces the high voltage potentials...

  • Page 26: Grid Dc Restorer

    Circuit Description— 485/R485 Service C l663. On the positive swing of the DC Restorer drive, the coupling path for AC changes to the input of U1624. The high voltage end of C l663 is clamped to the cathode output correction is AC coupled through C l612 directly to the cathode.

  • Page 27: Beam Current Limit

    Circuit Description—4 8 5 /R 4 8 5 Service the focus electrode. The focus pot R1640 is set for To prevent shutdown being signaled during the first optimum focus at low intensity level. 200 ms of instrument turn-on. C l 538 (thru R1538) pro­ vides a delay to compensate for charging currents in the CRT post-accelerator supply.

  • Page 28: Calibrator

    Circuit Description— 485/R485 Service the subsequent A sweep (B display). The first segment of CRT. This consists of four diodes, six capacitors and four non-linear shaping is done in U1710 by the biasing, which resistors including C1651 and C1681. The low-intensity...

  • Page 29: Maintenance

    The severity of the environment to which the 485 is 2. Place instrument front panel down on working subjected determines the frequency of maintenance. A surface and remove the rear feet (four screws).

  • Page 30: Lubrication

    Exterior. Loose dust accumulated on the outside of the 485 can be removed with a soft cloth or small brush. The should not require further lubrication. brush is particularly useful for dislodging d irt on and around the front-panel controls.

  • Page 31: Visual Inspection

    Table 4-1 lists obvious; however, particular care must be taken if heat- the main circuits in the 485 and the series of component damaged components are found. Overheating usually indi­ numbers assigned to each. Important voltages and wave­...
  • Page 32 Maintenance—4 8 5 /R 4 8 5 Service Fig. 4-1. Electrode configuration fo r semiconductors in this instrument. ®...

  • Page 33: Troubleshooting Equipment

    2. Multimeter Description, 10 megohm input impedance and 0 to 500 This color code applies to leads w ithin the 485 only. volts range, AC and DC; ohmmeter, 0 to 50 megohms. Color code o f the A C pow er cord is: Accuracy, w ithin 3%.

  • Page 34: Troubleshooting Techniques

    Maintenance— 485/R485 Service TABLE 4-3 5. Variable Autotransformer Power Supply Tolerance and Ripple Description: Output variable from 0 to 140 volts, 10 amperes minimum rating. Must have three-wire power cord, (Referenced to TP GND) plug, and receptacle. Maximum Ripple Tolerance...

  • Page 35: Special Troubleshooting Information

    In addition, Troubleshooting the Power Supply. Table 4-4 gives a operating waveforms, logic levels, and other operating guide to troubleshooting the power supply of the 485. information for the integrated circuits are given in the Circuit Description section.
  • Page 36 Maintenance— 485/R485 Service TABLE 4-4 (cont) Trouble Symptoms Checks to Make Comments Check comb connector " R " for proper 1 nverter starts then shuts o ff at fast Overvoltage Stop circuit stops inverter installation. rate (10 Hz or faster).
  • Page 37 Maintenance— 485/R485 Service B ALA N C E NODE NOTE The balance node (TP1951) acts as an " O R " circu it fo r various faults which w ill stop the inverter. To isolate the fault, determine the voltage level a t TP1951 during the 2 0 ms sampling period which immediately follows the turn-on transient o f approxim ately 6 ms.
  • Page 38 Maintenance—4 8 5 /R 4 8 5 Service F.) At TP1958 H.V. Current Sens during sampling period with short on —2950 supply. G.) At TP 1926. Inverter Current Sens during sampling period with all supplies normal. H.) At TP 1926. Inverter Current Sens during sampling period with short on +15 supply.

  • Page 39: Corrective Maintenance

    C O R R E C TIVE M A IN TE N A N C E Special Parts. In addition to the standard electronic components, some special components are used in the 485. These components are manufactured or selected by General Tektronix, Inc.

  • Page 40: Component Replacement

    Maintenance— 4 8 5 /R 4 8 5 Service The reliability and accuracy of this instrument can be W A R N I N G maintained only if proper soldering techniques are used when repairing or replacing parts. General soldering tech­ niques which apply to maintenance of any precision Line A C and stored DC potentials are present inside electronic equipment should be used when working on this...

  • Page 41: Transformer Board Removal

    Maintenance— 485/R485 Service c. Remove Sweep board. touch and discharge to the chassis ground im ­ mediately a fte r clearing the housing (take care to avoid discharge to the nearby Vertical Deflection d. Remove Inverter board (see Inverter board removal connections).

  • Page 42: Inverter Board Removal

    16-pin integrated circuits to prevent damage to the pins. Remove the 4 screws holding the Inverter board and This tool is available from Tektronix, Inc. Order Tektronix the 4 screws holding the insulating material of the two large Part No. 003-0619-00. If an extracting tool is not available transistors at the rear of the board.

  • Page 43: C. End-Lead Pin Connectors

    REPACKAGING FOR SHIPMENT C. END-LEAD PIN CONNECTORS. If the Tektronix instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag showing: The pin connectors used to connect the wires to the...

  • Page 44: Interboard Comb Connection Locations

    Maintenance— 485/R485 Service •REM O VED IN LATER PRODUCTION HORIZ AMP BOARD J--------------- B TRIGGER HORIZONTAL DC RESTORE CATHODE REG nnnn VERT BOARD VERT VERT SCALE OUTPUT PREAMP ILLUM 1193-14 Fig. 4-3. Interboard comb connection locations. REV. B, AUG. 1975...

  • Page 45: Calibration

    To ensure instrument accuracy, check the calibration of The following test equipment and accessories, or its the 485 after every 1000 hours of operation, or every six equivalent, is required for complete calibration of the 485. months if used infrequently. Before complete calibration,...
  • Page 46 50 ns. timing; B timing; Differential TEKTRONIX 2901 Time- timing; Delay Jitter. Mark Generator. TEKTRONIX Type 191 Con­ Adjust: A and B trigger; X-Y Medium-Frequency 2 MHz to ’ 50 MHz; reference stant Amplitude Signal Gen­ Constant-Amplitude frequency, 50 kHz; output phasing.
  • Page 47 Calibration-485/R485 Service TABLE 5-1 TEST EQUIPMENT (cont) Examples of Applicable Test Equipment Description Minimum Specifications Usage Adjust: 50 12 high frequency T E K T R O N IX Type Square-Wave Frequency Range, 100 Hz to transient response; 5012 low Generator 100 kHz;...
  • Page 48 Differential Amplifier. 7403N/7B50/7A22 PART 1 - PERFORM ANCE CHECK Connect the 485 to a pow er source which meets the d. Change generator to 2 V P-P o f 2 MHz; set TIM E/ specified voltage and frequency requirements. Press the DIV to 0 .5 ps.
  • Page 49 Calibration— 485/R485 Service TABLE 5-3 3. ADJUST TRACE R O TA TIO N a. Position trace to graticule center. Maximum DTP Dial Error at A Time/Div Reference Setting near 9.0 (minor Position divisions) b. Adjust TRACE ROTATION (rear panel) so trace parallels the center graticule line.
  • Page 50 Check in AC, LF REJ, and DC with source switch in INT, that triggering occurs on 0.3 div of 3 MHz, 0.3 div of CH 2 thru the 10X attenuator and dual BNC input cable 50 MHz and 1.5 div of 350 MHz. (TEKTRONIX Part No. 067 0525-00).
  • Page 51 Calibration— 485/R485 Service b. Connect CAL 5 V to CH 1 input. b. Set SOURCE switch to EXT; signal applied to vertical input and EXT TRIG. c. Check for 5 divisions of signal ±0.025 div (0.5%). c. Check that the instrument triggers on 20 mV of (Outside +15°C to +35°C range check for 0.05 div 1 %.)
  • Page 52 485. Connect the 485 to a power source which meets specified voltage and frequency requirements. Press the POWER pushbutton to turn the 485 on and allow i t to warmup fo r 3. CHECK V O LTA G E...
  • Page 53 Calibration— 485/R485 Service 6. CHECK C A LIB R A TO R 1 kHz DUTY CYCLE 4. CHECK C A LIB RA TO R A M PLITU D E (49.8 to 50.2%) a. Remove Q2114 located on Sweep board near Cali­...
  • Page 54 Calibration—4 8 5 /R 4 8 5 Service a. Set TIM E/DIV to 0.1 ps; HORIZ DISPLAY to A, and a. Set SWEEP MODE to AUTO TRIG. VERT MODE to CH 1 (make sure SWEEP MODE is in AUTO TRIGGER). b.
  • Page 55 Measure and record the DC voltage. parallels center graticule line. Observe the 485 display and adjust FOC GAIN 16. ADJUST Y A X IS A L IG N M E N T (R1710) for optimum focus. If the original setting cannot Apply 1 ms and 0.1 ms markers of full screen...
  • Page 56 Calibration—4 8 5 /R 4 8 5 Service Adjust A CAL (R1308), located near center rear of b. Adjust DELAY START (R918) to get intensified portion on the second time mark and the pulse on B trace Sweep board, for one marker/div and for exact alignment to just start positive at the front of B trace.
  • Page 57 The intensified zone of A must start one overshoot cycle at the step. on the second time mark. Switch the 485 to 10 ns; the step and ramp ampli­ d. Set the DTP to exactly 8.95. tudes w ill increase. Make further adjustment if necessary to optimize the 'linear ramp"...
  • Page 58 Calibration—4 8 5 /R 4 8 5 Service INTERACTION with 5 ns timing, repeat steps 26 and 36. CHECK D ELA Y T IM E A C C URACY, 10 ns/ 27 if necessary. div to 0.5 s/div Use time marks that give 1 to 5 markers/div on the A display.
  • Page 59 Frequency to 1 kHz, and Symmetry for 50% duty Rotate DTP; check that sweep ends after the inten­ cycle. Set the 485 CH 1 and CH 2 inputs to DC; sified zone. VOLTS/DIV to 2 V; Position trace to top graticule line; set input impedance selector to 50 £2 (button out).
  • Page 60 Position CH 1 and CH 2 trace to graticule center. offset current in the 485. e. Push ADD and check for less than 0.2 div shift. This calculated value of Input R must be within 49.75 to 50.25 ft.
  • Page 61 Calibration— 485/R485 Service 54. CHECK BEAM FINDER c. Adjust Input I (R206) fo r CH 1 and Input I (R306) for CH 2, (located on front of Vertical board) fo r no trace a. Check that trace remains within the graticule area shift.
  • Page 62 If any deflection was noted in step g, adjust CH 2 VARIABLE VOLTS/DIV for a null (single trace) on the Type 106 High Amplitude output, 50 £2 input of the 485 display (do not change this setting unless specified in cable the following steps).
  • Page 63 Calibration— 485/R485 Service b. Adjust for best response. 65. ADJUST 1 M£2 A M P LIFIE R G AIN CH 1 and CH 2 R613 Adjust for best flat Four o f five upper NOTE R614 top response. adjustments in the MAIN...
  • Page 64 = 1.00. Set Type 191 to 50 MHz and check for 0.8 div or less of vertical deflection. Connect VSWR Autotester to 485 CH 1 input; set 485 input to 50 £2, DC coupled. Push CH 2 VARIABLE GAIN to CAL.
  • Page 65 Check positive edge risetime of the Calibrator as knob dot positioned at top center (12:00 o'clock). observed on the 485. Should be less than 1.4 ns. o. Switch trigger COUPLING to DC, adjust INT TRIG 73. ADJUST A T R IG G E R (Board Next to Atten...
  • Page 66 Set VERT MODE to CH 2; INT TRIG to NORM; f. Disconnect generator and cables from the 485. HORIZ DISPLAY to A; SWEEP MODE to NORM TRIG; A Trigger SOURCE to EXT, CH 2 input to 50 El.
  • Page 67 Calibration—4 8 5 /R 4 8 5 Service c. Reset lamp should light. c. Use the A LEVEL control to trigger on the larger of the positive steps. This should give a 3.3 div display (167 mV) on CH 2. Use CH 2 POSITION control to center d.
  • Page 68 Calibration—4 8 5 /R 4 8 5 Service Adjust X-Y L I 346 (Sweep board) for a closed 83. CHECK X-Y BANDW IDTH lissajous figure. 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. e.

  • Page 69: Rackmounting

    Introduction separated. To identify the left or right assembly note the The TEKTRONIX Type R485 Oscilloscope is designed position of the automatic latch (see Fig. 6-3). When to mount in a standard 19-inch rack.

  • Page 70: Alternate Rear Mounting Methods

    Rackmounting—4 8 5 /R 4 8 5 Service Removing or Installing the Instrument Push the instrument all the way into the rack and secure it to the rack with the securing screws and washers as After initial installation and adjustment of the slide-out shown in Fig.
  • Page 71 10-32 screws Rear rail Front rail Stationary section Intermediate section I_____ Chassis section Fig. 6-2. The 485 installed in a cabinet rack (sides removed); (A) held into rack with securing screws, (B) extended on slideout tracks. Fig. 6-3. Slideout track assemblies.
  • Page 72 Rackmounting— 485/R485 Service Stationary s section of;: slideout^ track Untapped holes •Note: Use FHS screws if front rail holes are countersunk. (B) Untapped front rail (A) Front rail tapped for 10*32 screws Fig. 6-4. Methods of mounting the stationary section to the front rails.
  • Page 73 Rackmounting— 485/R485 Service TO INSERT THE R485 1. Pull the intermediate section of each slideout track out to its fully extended position. 2. Insert the chassis sections (on in s tru m e n t) in to intermediate sections. 3. Press both stop latches and...
  • Page 74 Rackmounting— 485/R485 Service...

  • Page 75: Electrical Parts List

    If a part you have ordered has been replaced with a new or improved part, your local Tektronix, Inc. Field Office or representative will contact you concerning any change in part number.
  • Page 76 Replaceable Electrical Parts 485 CROSS IN D E X -M F R . CODE NUMBER TO MANUFACTURER Manufacturer Address City, State, Zip Mfr. Code 2015 2ND STREET BERKLEY, CA 94710 OOOOA LEMO USA P 0 BOX 3608 HARRISBURG, PA 17105 AMP, INC.
  • Page 77 Replaceable Electrical Parts 485 CROSS IN D E X -M F R . CODE NUMBER TO MANUFACTURER Mfr. Code Manufacturer Address City, State, Zip SWITCHCRAFT, INC. 5555 N. ELSTON AVE. CHICAGO, IL 60630 82389 OGALLALA, NE 69153 84411 TRW ELECTRONIC COMPONENTS, TRW CAPACITORS 112 W. FIRST ST.
  • Page 78 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CKT BOARD ASSY SLIGHT BLOCK(485,485-1) 80009 670-1514-00 A1 (2) 670-1514-00 CKT BOARD ASSYtLIGHT BLOCK(485-2) 670-1599-00 A2(2) 670-2599-00 80009 A3 (2) 670-1512-00...
  • Page 79 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name Description & Code Mfr Part Number 283-0070-00 B010100 B020432X CAP.,FXD,CER DI:3OPF,10%,50V C471 72982 8121-060C0G030OK 283-0065-00 CAP.,FXD,CER DI:0.001UF,5%,100F,100V C481 72982 805-505B102J B010100 CAP.,FXD,CER DI:100PF,5%,50V C49* 283-0330-00 B020432 72982...
  • Page 80 Replaceable Electrical Parts 485 Serial/Model No. Tektronix Name Description Ckt No. Part No. Dscont & Mfr Part Number Code CAP.,FXD,CER DI:0.1UF,+80-20*,12V C272 283-0023-00 MX0104Z1205R5 91418 CAP.,FXD,CER DI:0.022UF,20%,50V C282 283-0191-00 72982 8121N075Z5U0223M C290 283-0191-00 CAP.,FXD,CER DI:0.022UF,20*,50V 8121N075Z5U0223M 72982 CAP.,FXD,ELCTLT:22UF,20*,15V 290-0512-00 C310...
  • Page 81 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Oscont Code Mtr Part Number Name & Description C556 283-0140-00 CAP.,FXD,CER DI:4.7PF,5%,50V 72982 8101E003A479C 283-0638-00 CAP.,FXD,MICA D 130PF, ,100V 00853 D151E131F0 C557 B010100 B089999 CAP.,FXD,CER DI:6.8PF,+/-0.5PF,200V 72982 374-001C0H0689D C563...
  • Page 82 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CAP.,FXD,MICA D:130PF,2%,300V 00853 D155E131G0 283-0618-00 B060000 C705 CAP.,FXD,CER DI:0.01UF,+100-0%,500V 56289 19C241 C706 283-0068-00 72982 8111B065C0G0180J CAP.,FXD,CER DI:18PF,5%,50V C707 283-0159-00 CAP.,FXD,CER DI:4.7PF,5%,50V...
  • Page 83 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CAP.,FXD,MICA D:16.8PF,+/-0.5PF,500V C881 283-0663-00 00853 D155C16.8D0 C882 281-0182-00 CAP., VAR, PLSTC:1.8-10PF,500V 34553 2222-809-05002 283-0239-00 CAP.,FXD,CER DI:0.022UF,10%,50V 72982 8131N075C223K C883 C894 283-0004-00 CAP.,FXD,CER DI:0.02UF,+80-20%,150V...
  • Page 84 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mtr Part Number 290-0527-00 CAP. ,FXD,ELCTLT:15UF,20%,20V 90201 TDC156M020FL C1130 290-0527-00 CAP.,FXD,ELCTLT:15UF,20%,20V 90201 TDC156M020FL C1131 CAP.,FXD,CER DI:0.1UF,20%,50V 72982 C1132 283-0111-00 8121-N088Z5U104M CAP.,FXD,ELCTLT:22UF,20%,15V C1133 290-0512-00 56289...
  • Page 85 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name Description Code Mfr Part Number & 285-0651-01 CAP.,FXD,PLSTC:17 OOPF,5%,100V C1433 56289 410P105 285-0566-00 CAP.,FXD,PLSTC:0.022UF,10%,200V C1434 56289 410P22392 C1435 285-0919-00 CAP., FXD,PLSTC:0.22UF,10%,100V 56289 LP66A1B224K002 290-0523-00 C1436 CAP.,FXD,ELCTLT:2.2UF,20%,20V 56289...
  • Page 86 Replaceable Electrical Pdrts 485 Tektronix Serial/Model No. Name & Description Ckt No. Part No. Dscont Code Mfr Part Number CAP.,FXD,CER DI:0.02UF,+80-20%,150V 283-0004-00 72982 855-558-Z5V0203Z C1742 CAP.,FXD,CER DI:1.5PF,+/-0.5PF,500V 281-0526-00 B010100 B139999 72982 301-000S2K0159D C1743 CAP. ,FXD,CER DI:1PF,+/-0.1PF,500V 72982 C1743 281-0609-00 B140000 374-005C0K0109B CAP.,FXD,CER DI:0.02UF,+80-20%,150V...
  • Page 87 Replaceable Electrical Parts 485 M fr T e k tr o n ix S e r ia l/M o d e l N o. C k t N o. E ft D s c o n t N a m e & D e s c rip tio n...
  • Page 88 Replaceable Electrical Parts 485 Serial/Model No. Tektronix Name & Description Ckt No. Part No. Dscont Code Mfr Part Number SEMICOND DEVICE: SILICON,35V,10OMA CR32 152-0323-01 XB150000 80009 152-0323-01 B010100 B149999 SEMICOND DEVICE:SILICON,20V,20PA 80009 152-0367-00 CR333 152-0367-00 B155229 SEMICOND DEVICE iSILICON, 15V, 50MA...
  • Page 89 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Name & Description Part No. Dscont Code Mfr Part Number CR879 152-0141-02 SEMICOND DEVICE:SILICON,30V,150MA 07910 1N4152 152-0141-02 SEMICOND DEVICE:SILIC0N,30V,150MA CR886 07910 1N4152 SEMICOND DEVICE:SILICON,300V,0.13A CR902 152-0307-00 04713 SSD1150 SEMICOND DEVICE: SILICON,30V,15OMA...
  • Page 90 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No, Dscont Name & Description Code Mfr Part Number SEMICOND DEVICE:SILICON,30V,150MA 1N4152 152-0141-02 07910 CR1534 SEMICOND DEVICEtSILICON,30V,150MA 1N4152 CR1535 152-0141-02 07910 SEMICOND DEVICE:SILICON,30V,15 OMA 1N4152 CR1536 152-0141-02 07910 1N4152 SEMICOND DEVICE: SILICON,3 OV,15 OMA...
  • Page 91 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Name Description Dscont Mfr Part Number Code & CR1931 152-0333-00 SEMICOND DEVICE:SILICON,55V,200MA 80009 152-0333-00 CR1932 152-0333-00 SEMICOND DEVICE:SILICON,55V,200MA 80009 152-0333-00 CR1933 152-0333-00 SEMICOND DEVICE:SILICON,55V,200MA 80009 152-0333-00 CR1934 152-0333-00 SEMICOND DEVICE:SILICON,55V,200MA...
  • Page 92 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Mfr Part Number Name Description Code Ckt No. Part No. Dscont & 80009 131-1003-00 CONNECTOR BODY,: CKT CD MT,3 PRONG J1291 131-1003-00 80009 131-1003-00 CONNECTOR BODY,: CKT CD MT,3 PRONG J149 131-1003-00 80009...
  • Page 93 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number COIL,RF:35NH 80009 108-0557-00 L240 108-0557-00 80009 108-0557-00 L241 108-0557-00 COIL,RF:35NH 80009 108-0245-00 108-0245-00 COIL,RF:3.9UH L242 L2451 L2481 80009 108-0245-00 L262 108-0245-00 COIL,RF:3.9UH...
  • Page 94 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Code Mfr Part Number Ckt No. Part No. Dscont L73S* L736* L746?" L747* L7481 L7491 80009 108-0578-00 COIL,RF:45NH 108-0578-00 L753 76493 70F125A1 C0IL,RF:12UH L7S7 108-0249-00 80009 108-0245-00 COIL,RF:3.9UH L844 108-0245-00...
  • Page 95 Replaceable Electrical Parts 485 Tektronix Serial/Model No. _ C k t^ Q ^ Code Mfr Part Number Dscont Name & Description Part No. U 82S 80009 108-0742-00 108-0742-00 COIL,RF:8 3UH,TOROIDAL l 1835 80009 108-0709-00 108-0709-00 C0IL,RF:1.6MH 1-2008 80009 108-0646-00 108-0646-00 COIL.RF:80UH...
  • Page 96 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number 151-0220-00 TRANSISTOR: SILICON,PNP 151-0220-00 0454 80009 151-0333-00 TRANS ISTOR :SILICON, NPN, SEL FROM MPS918 80009 151-0333-00 Q456 TRANSISTOR: SILICON,PNP 151-0220-00 Q460...
  • Page 97 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No Part No. Dscont Name & Description Code Mfr Part Number Q1016 151-0362-00 TRANSISTOR: SILICON, PNP, SEL FROM 2N4258 80009 151-0362-00 Q1028 151-0220-00 TRANSISTOR:SILICON,PNP 80009 151-0220-00 Q1068 151-0220-00 TRANS ISTOR: SILICON, PNP...
  • Page 98 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number 80009 151-0127-00 B010302 TRANS ISTOR: SILICON, NPN 151-0127-00 Q1336 80009 Q1338 151-0127-00 TRANSISTOR: SILICON, NPN 151-0127-00 151-0224-00 80009 151-0224-00 Q1342 TRANS ISTOR: SILICON, NPN...
  • Page 99 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Part No. Dscont Name & Description Ckt No. Code Mfr Part Number RES.,FXD,CMPSN:10 OHM,5%,0.125W 317-0100-00 01121 BB1005 317-0100-00 RES.,FXD,CMPSN:10 OHM,5%,0.12SW 01121 BB1005 RES.,FXD,CMPSN:360 OHM,5%,0.125W 317-0361-00 01121 BB3615 315-0201-00 RES.,FXD,CMPSN:200 OHM,5%,0.25W 01121 CB2015 R121 RES.,FXD,CMPSN:68 OHM,5%,0.125W...
  • Page 100 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Code Mfr Part Number Ckt No. Part No. Dscont 01121 RES.,FXD,CMPSN:10 OHM,5%,0.25W CB1005 R821 315-0100-00 01121 CB1035 RES., FXD,CMPSN:1OK OHM,5%,0.25W 315-0103-00 R831 RES.,FXD,FILM:93.1 OHM,1»,0.125W 91637 MFF1816G93R10F 321-0094-00 01121 RES., FXD,CMPSN:200 OHM,5%,0.125W...
  • Page 101 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R227 321-0273-00 RES.,FXD,FILM:6.81K OHM,1%,0.12SW 91637 MFF1816G68100F 321-0246-00 RES.,FXD,FILM:3.57K OHM,1%,0.125W 91637 MFF1816G35700F R228 R230 311-0091-00 RES.,VAR,N0NWIR:1K OHM,10%,0.50W 01121 W-3083E RES.,VAR,NONWIR:250 OHM,10%,0.50W R240...
  • Page 102 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Mfr Part Number Name & Description Code Ckt No. Dscont Part No. RES.,FXD,CMPSN:43 0HM,5%,0.25W 0XX2X CB4305 R3X6 3X5-0430-00 9X637 MFFI8I6G43200F RES.,FXD,FILM:4.32K OHM,X%,O.X25W R3X7 32X-0254-00 RES. ,VAR,NONWIR:200K OHM,30%,0.50W 80294 3326H-G48-204 R3X8 3XX-0660-00 RES.,FXD,FILM:4.32K OHM,X%,O.X25W...
  • Page 103 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Name Description Mfr Part Number Part No. Dscont Code & R413 315-0102-00 RES.,FXD,CMPSN:1K OHM,S%,0.25W 01121 CB1025 R414 321-0175-00 RES.,FXD,FILM:649 OHM,1%,0.125W 91637 MFF1816G649R0F R415 321-0126-00 RES.,FXD,FILM:200 OHM,1%,0.125W 91637 MFF1816G200R0F R416 321-0184-00 RES.,FXD,FILM:806 0HM,1»,0.125W...
  • Page 104 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Code Mfr Part Number Name & Description Ckl No. Part No. Dscont CB2215 01121 RES.,FXD,CMPSN:220 OHM,5%,0.25W R525 315-0221-00 MFF1816G49R90F 91637 RES.,FXD,FILM:49.9 OHM,1%,0.125W RS28 321-0068-00 91637 MFF1816G49R90F RES.,FXD,FILM:49.9 OHM,1%,0.125W R529 321-0068-00 MFF1816G33R20F 91637 RES.,FXD,FILM:33.2 OHM,1»,0.125W...
  • Page 105 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Mfr Part Number Code R608 311-1265-00 RES.,VAR,N0NWIR:2K OHM, 10*,0. 50W 3329P-L58-202 32997 R609 311-1265-00 RES. ,VAR,N0NWIR:2K OHM, 10*,0.SOW 3329P-L58-202 32997 R610 321-0300-00 RES.,FXD,FILM:13K OHM,1*,0.125W 91637 MFF1816G13001F RES.,FXD,CMPSN:20 OHM,5*,0.125W...
  • Page 106 Replaceable Electrical Parts 48S Tektronix Serial/Model No. Code Mfr Part Number Ckt No. Name & Description Part No. Dscont 80009 307-0292-09 R691 307-0292-09 B142300 RES.,FXD,FILM:181 OHM,(NOM VALUE),SEL 01121 CB51G5 R696 307-0113-00 RES.,FXD,CMPSN:5.1 OHM,5%,0.25W 01121 CB2405 R701 315-0240-00 RES.,FXD,CMPSN:24 OHM,5%,0.25W 01121...
  • Page 107 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R765 311-0607-00 RES. ,VAR,NONWIR:10K OHM,10%,0.50W 73138 82P-59-4-103K B010100 B049999 RES.,FXD,FILM:2.61K OHM,1%,0.125W 91637 MFF1816G26100F R766 321-0233-00 B050000 RES.,FXD,FILM:2.37K OHM,1%,0.125W 91637 MFF1816G23700F R766 321-0229-00 RES.,FXD,CMPSN:200 OHM,5%,0.25W...
  • Page 108 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Ckt No. Part No. Dscont Code Mfr Part Number 01121 RES.,FXD,CMPSN:620 OHM,5%,0.25W R843 315-0621-00 CB6215 01121 R844 315-0681-00 RES.,FXD,CMPSN:680 OHM,5%,0.25W CB6815 01121 RES.,FXD,CMPSNi240 OHM,5%,0.25W 315-0241-00 R845 CB2415 R851 321-0291-00 RES.,FXD,FILM:10.5K OHM,1%,0.125W...
  • Page 109 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mtr Part Number R933 315-0470-00 RES.,FXD,CMPSN:47 OHM,5%,0.25W 01121 CB4705 RES.,FXD,FILM:5.23K OHM,1»,0.125W 91637 MFF1816G52300F R934 321-0262-00 R935 RES.,FXD,CMPSN:2.2K OHM,5%,0.25W 01121 CB2225 315-0222-00 R936 RES.,FXD,CMPSN:5.6K OHM,5%,0.25W...
  • Page 110 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number RES.,FXD,CMPSN:300 OHM,5%,0.25W 01121 CB3015 R1038 315-0301-00 RES.,FXD,CMPSN:240 OHM,5%,0.25W 01121 CB2415 R1039 315-0241-00 RES.,FXD,FILM:64.9 OHM,1*,0.125W 91637 MFF1816G64R90F R1040 321-0079-00 RES.,FXD,FILM:69.8 OHM,1%,0.125W 91637...
  • Page 111 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Code Mfr Part Number Ckt No. Part No. Dscont RES.,FXD,CMPSN:100 OHM,5%,0.25W 01121 CB1015 R1097 315-0101-00 RES.,FXD,CMPSN:200 OHM,5*,0.25W 01121 CB2015 R1098 315-0201-00 RES.,FXD,CMPSN:47K OHM,5%,0.25W 01121 CB4735 R1101 315-0473-00 RES.,FXD,CMPSN:47K OHM,5%,0.25W 01121...
  • Page 112 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Dscont Name & Description Part No. Code Mfr Part Number 315-0560-00 RES.,FXD,CMPSN:56 0HM,5%,0.25W 01121 CB5605 R1179 RES.,FXD,CMPSN:6.8K OHM,5%,0.SOW EB6825 R1181 301-0682-00 01121 RES., FXD,CMPSN:6.8K OHM,5%,0.50W 01121 EB6825 R1182 301-0682-00 RES.,FXD,CMPSN:1.8K OHM,5%,0.5W...
  • Page 113 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number RES.,FXD,FILM:4.32K OHM,1%,0.125W 91637 MFF1816G43200F R1269 321-0254-00 R1271 RES.,FXD,CMPSN:330 OHM,5%,0.25W 01121 CB3315 315-0331-00 R1272 RES.,FXD,CMPSN:2K OHM,5%,0.25W 01121 CB2025 315-0202-00 RES. ,VAR,NONWIR:20K OHM,10%,1W...
  • Page 114 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Code Mfr Part Number Ckt No. Part No. Dscont RES.,FXD,FILM:500K OHM.O.1%,0.50W 91637 MFF1226C50002B 323-0740-07 R1411 RES. ,FXD,FII/J:250K OHM,0.1%, 0.50W 91637 MFF1226C25002B R1412 323-0742-07 RES. ,FXD,Fmt:50K OHM.O. 1%,0.50W 91637 MFF1226C50001B 323-0636-07 R1413 RES.,FXD,FILM:100K OHM,0.1*,0.SOW...
  • Page 115 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name Description Code Mfr Part Number & R1538 315-0153-00 RES.,FXD,CMPSN:15K OHM,5%,0.25W 01121 CB1535 R1539 315-0103-00 RES.,FXD,CMPSN:10K OHM,5%,0.25W CB1035 01121 R1541 315-0683-00 RES., FXD, CMPSN :68K OHM,5»,0.25W 01121 CB6835...
  • Page 116 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Part No. Dscont Name & Description Code Mfr Part Number Ckl No. .,FXD,CMPSN:IK OHM,5%,0.25W 01121 CB1025 R1597 3 1 5 - 0 1 0 2 - 0 0 . ,FXD,CMPSN:51 OHM,5%,0.25W 01121 CB5105...
  • Page 117 Replaceable Electrical Paris 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number 321-0272-00 R1708 RES.,FXD,FILM:6.65K OHM,1%,0.125W MFF1816G66500F 91637 R1709 321-0314-00 RES.,FXD,FILM:18.2K OHM,1%,0.125W 91637 MFF1816G18201F RES. ,VAR,N0NWIR:5K OHM,10%,0.50W R1710 311-0633-00 73138 82-30-0 B010100 B059999 RES.,FXD,FILM:8.25K OHM,1%,0.125W...
  • Page 118 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number RES.,FXD,FILM:45.3K OHM,1%,0.125W R1798 321-0352-00 91637 MFF1816G45301F RES. ,VAR,NONWIR:100K OHM,0.5W R1799 311-1099-00 01121 WA1G040S104AZ RES. ,FXD,CMPSN:75K OHM,5%,0.25W R1801 315-0753-00 01121 CB7535 R1802 301-0154-00 RES.,FXD,CMPSN:150K OHM,5%,0.50W...
  • Page 119 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Name & Description Code Mfr Part Number Ckt No. Part No. Dscont RES.,FXD,FILM:10K OHM,1%,0.125W 91637 MFF1816G10001F R1957 321-0289-00 01121 RES.,FXD,CMPSN:470 OHM,5%,0.25W CB4715 R1958 315-0471-00 01121 RES.,FXD,CMPSN:10K OHM,5%,0.25W CB1035 R1959 315-0103-00 01121 RES.,FXD,CMPSN:51K OHM,5%,0.25W...
  • Page 120 LM301AN ^See Mechanical Parts List for replacement parts. ^Furnished as a unit with R720. ^Furnished as a unit with R90. ^Furnished as a unit with R898. 3485, 485-1 only. ^Furnished as a unit with R1020 4485-2 only. 5485 only. 7-46...
  • Page 121 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number 155-0076-00 MICROCIRCUIT,LI :ML, INPUT PROTECTION 80009 155-0076-00 U210 155-0078-00 B010100 B143429 MICROCIRCUIT,LI :ML,VERT AMPL 80009 155-0078-00 U210 155-0078-10 155-0078-10 B143430 MICROCIRCUIT,LI :ML,VERT AMPL,SEL...
  • Page 122 Replaceable Electrical Parts 485 Tektronix Serial/Model No. Ckt No. Part No. Name Description Code Mfr Part Number Dscont & U1910 15S-0067-02 MICROCIRCUIT,DIsML,POWER SUPPLY REGULATOR 80009 155-0067-02 02042 156-0067-00 MICROCIRCUIT,LI:OPERATIONAL AMPLIFIER 80009 156-0067-00 MICROCIRCUIT,LXOPERATIONAL AMPLIFIER 80009 156-0067-00 02052 156-0067-00 MICROCIRCUIT,LI OPERATIONAL AMPLIFIER...

  • Page 123: Diagrams And Circuit Board Illustrations

    Section 8— 485/R485 Service DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS Symbols and Reference Designators Electrical components shown on the diagrams are in the following units unless noted otherwise: Capacitors = Values one or greater are in picofarads (pF). Values less than one are in microfarads (pF).
  • Page 124 Located on back of board: S125 R127 not used on A6 board. C104 Fig. 8-1. AS & A6 50 Attenuator board. •See Parti List for serial numbor ranges. Fig. 8-2A. A3 Hi Z Attenuator board (485 & 485-1 only) SN B155790 up.
  • Page 125 Fig. 8-2C. A4 Low 2 Control board (485-2 only). P80 P85 •Soe Part List for serial number ranges. P90 P95 Fig. 8-28. A. A3 Hi 2 Attenuator board (485 & 485-1 only) SN B010100 8155789. REV E. MAR 1979...
  • Page 126 VERTICAL SIGNAL TO VERT PREAMP Q « -* »" c o u p l i n g • • G N D « • ------------- ?L ■)! |CH 1QR Y|(fe. IKA 20 dF U * ^ £/ftS P /5 fo O :V c c c tt^ ) J P /5fcO PROM...
  • Page 127 VERTICAL SIGNAL TO V E R T PREAMP FROM <S> SWITCHED GND FROM VERT MODE SI5BO P A R T IA L } s o n B O A R D TRACE IDENT TO R ZBS C M I/v RS8C I C U Z <£>...
  • Page 128 4 8 5 /R 485 S e r v ic e 5 m V B A L A D J @ MAR 1979...
  • Page 129 si win I n I IS „ 2 5 3 C 2 1 1 « C iS P 2 5 4 ® £ ®c *i m SML p ^ P f f l r a l l 2 4 2 S ' ! •...
  • Page 130 + 5V 5 « v PX5J v poviriow ) &cO 9f-s.5v^. partial LR 262 L , d M l 2 ATTEN 6D P300, 4-9V ^ * « v | L S 9 0 --------K P R 2 2 S S3 5_____________ CR29I 4.ft»K <...
  • Page 131 PO S C T R M A I N V E R T G A I N A D J T P 4 1 8 T P 4 1 9 C282 R272 R282 R271 R284 & Q 2 7 4 « R404 R428 §...
  • Page 132 P270 C R 4 -1 Q (A) E X T TRIG F R O M S1IO < s > - TR IG F R O M V R S 3 9 3> t r ig FROM VR838 CW I V ER T SWITCHING LOGIC FR O M...
  • Page 133 T R I G G A I N A D J R 5 1 2 C 5 1 2 oo o> in in Q 5 1 8 R 5 1 3 R 5 0 5 R 5 1 6 U 5 1 0 R 5 1 7 X G A I N U 5 3 0...
  • Page 134 *S e e Parts L ist fo r Fig. 8 - 5 . A 7 Partial V e r t ic a l a m p lif ie r b o a rd . serial n u m b e r ranges. R E V .
  • Page 135 CM I -»>— > > t r i g l o g i c F R O M R IS 98 <$> CH 2 T R IG LOGIC F r o m R I599 < > 1193-24 T R IG G E R A M P L IF IE R SW ITC H IN G <4>...
  • Page 136 M A IN V E R T G A IN ADJ C M C O C O * C O 10 5 to R683 C O C R657 C663 R681 R623 rs.C N C M R664 C M C M C O S Q682 R682 c c S S g C 6 4 9...
  • Page 137 Fig. 8 - 6 . Partial V e r t ic a l a m p lif ie r b o ard . * See Pgrts L js f f o r serial n u m b e r ranges. R E V .
  • 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 A M P L IF IE R <s>...
  • Page 139 1 1 9 3 -3 2 O U T TD A R M TD SENS A R M TD O U T TD T R IG ADJ *See Parts List for serial number ranges. Fig. 8-7A. A8 A Trigger board (485 only).
  • Page 140 C 7 8 5 R827 R784 R771 CR784 U780 C R 1 S S R775 R 7 8 3 R765 R 7 8 2 ARMTD ARM TD OUT TD SENS OUT TO 8 7B. A9 A Trigger Fig. board (485-1, 2 only). Ar“...
  • Page 141 QQOZ < M ftK SWP G A T E VOLTAGE CONDITIONS 0.5 div of 1 kH? Cal Signal • i --------- * ■ < i SWEEP MODE-NORM 0 8 5 4 < $ > COUPLING-AC /K/ H «\ SOURCE-INT HORIZ DISPLAY-A flii _ „...
  • Page 142 H PREAMP D E LA Y STOP C877 D E LA Y START (A sweep IpS tim ing) iWT.-g s l i t R918 C882 (A sweep .Ip S tim ing) R937 R938 R931 R934 •C921 C874 C879 R87.4 +13 V TP R909 CR879 Q908...
  • Page 143 6 DlSAOi-t A ' SWP STOP F R O M Q I S 0 4 i O Q8l£> < S > DELAY PlCKOPF TO < R 1 0 9 0 , R » O D 3 <§> (PEAfO SWP GATE FROM <...
  • Page 144 J1063 SENS C l 139 L1057 R1057 R1056 L 1 131 "H w as R1063 LEV CTR C R1062 CR1104 R 1117 C 1061C 1064 R 1025»- R1062 R1064 tM C R 1052 C l063 R1061 eo ....S R 1 1 0 5 811 12 R 1119 >...
  • Page 145 Fig. 8-9. A l l Partial H orizontal am plifier board. •See Parts List fo r serial number ranges. REV. E, AUG. 1975...
  • Page 146 B E LA Y P1CK0FF FR O M QS02. VOLTAGE CONDITIONS H0RI2 DISPLAY-B SWEEP MODE-AUTO A' LEVEL-CW B' TRIGGER SOURCE-INT B- TRIGGER COUPLING-AC •B' TRIGGER LEVEL-0 DTP-1 TIME/DIV-1 m> 1.4 div of 1 kHz Cal Signal MOTE: * P AR T OF ETCHED CIRCUIT B O A R D ^ S U B S T R A T E SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER...
  • Page 147 R 1214 R 1206 R 1217 C 1214 3R 1206 C R 1215 Q 1212 C R 1214 R 1237 R 1219 R1201 Q 1 238 K 1272 Q 1204 '%• CR 1272 R1271 C R 1273 R 1272 C R 1204 R 1263 C 1204 R 1204...
  • Page 148 + ■ SWP GATE FROM RII2<) < S > -S W P GATE FROM RIIZ8 < > 1145-40 B TIME BASE GENERATOR <$> REV.E, AUG. I9TT 4 8 5 O S C I L L O S C O P E...
  • Page 149 I t O ° 2 01 > > R 1437 C1432 0 1 4 3 1 $ R1431 CR1431 R 1422 ■ n £> R 1421 R 1419 R 1418 > □ - M i n t R1416 R1415 R 1414 R 1413 R 1412 R1411...
  • Page 150 B REG Fig. 8-13 C l 364 H G A IN A D J R1362 Q-)3g4 R1368 R1366 P > C l 364 01378 R 1325 R 1361 Q1372 R1364 Q1366 R1372 C 1372 R1365 R1374 0 1 3 7 4 R 1375 £...
  • Page 151 R 1175 R 1176 ■ A R 1173 Z 33 -» C l 171 to ^ R1171 ■ A ro C l 172 33 33 Q 1174 R1194 R 1193 cn oi R 1 17 9 -> R 1178 -» R 1177 R 1174 C l 174...
  • Page 152 » /* iT...
  • Page 153 W H I T X-Y % I6, \ ^ ^ J ROM » Q - S ) © <$> X J II93-4S H O R IZ O N T A L A M P L IF IE R <U> 4 - 8 5 O S C U .
  • Page 154 •tl U - d r v i j l i ' t e t i ’ , F i *4 if e r , C1533 R1538 R1557 R1539 CR1539 • J » * 1 SL'UlFv U1544 fffe lW K , &...
  • Page 155 To e>A <5»E <T> QC\06> H O P .\"Z C £>M T(U >t I T P »G » LO*»C ■ * - T H lO » U?*|C- T O <9*3* <§> LOGIC <$> ftE V . F. AUGr, 1977 4 8 5 08CJLLOSC0PE 11 9 3 -4 7...
  • Page 156 Z OUT Z OUT AUTO HF TP DC TP FOC TP R1737 R1732 CR1735 C l 732 ( C l 781 £ C1782 R1725 R1779 R1781 Q1718 R1778 R1782 01732 0 1 7 28 R1717 Q1772 0 1 7 16 R1709 R1766 CR1710 FOC G AIN...
  • Page 157 Y AXIS GEOM COMP PL COMP PL GRID TP1746 CATH REG ► -P17Q0 CR1666 C l 792 TP1614 l y - x x m Cl 865 R1798 R1792 R1796 C1796 t p i 6 6 5 R1797 C l 6 6 3 R4668 C1653 CR1663...
  • Page 158 R 16°8 R1603 R1609 R1604 R1606 C1601 CR1601 R1605 1193-50 CR1602 -m m * ,- A 15 Partial Transformer board. Fig. 8-17 Refer to diagram <§>• R1687 DS1687 R2096 N C1603 | | S 1193-51 Fig. 8-18. A15 Transformer board.
  • Page 159 - 3 0 0 0 V TE.ST P O IN T (M A R K E D - 2 9 5 0 V IN 'SOME INSTRUMENTS) O S C ILL O S C O P E R E V .e .M A R .1 9 7 0 7/93-52.
  • Page 160 R 1958 R1959 R1917 CR 1912 R 1944 C l 951 0 1 9 1 8 C R 19 23 +59.4 V R1940 “2 CR1924 R1925 C1912 CR1925 C1921 o f j R1921 •R 1 9 0 3 <o § C1919 Located on back of U 1910.
  • Page 161 4y v v v t u a i MFC TC K - 3 C l 826 1 2 AMrrSfS 25KHZ § R1836 2 5 8 - 3 9 1 8 - 0 0 _ ^ | C l 835 C l 834 R1834 R1R 1848 L I 835...
  • Page 162 T I8 3 I Q I8 3 4 , WARNING CRI632 — LINE AC AND STORED D C POTENTIALS ARE R»834 PRESENT O N THE INVERTER CIRCUIT : « ? |0 3 4 - BOARD AND O N THE TRANSFORMER CIR­ CUIT BOARD.
  • Page 163 180 V +120 V 485/R485 Service R2089 R2093 C2008 C2092 CR2007 o CR2006 CR2014 CR2016 CR2015 C R 2 0 V 1 59.4 V C2011 C2012 +9 V CR2012 +25 V +5.5 V CR2038 C2039 C2018 - 5 . 5 V...
  • Page 164 2S2£n eKn:< = 5 < ? > POWER SUPPLY <§> 773 R E V. F , A U S . 1 9 7 7 4 8 5 s c il l o s c o p e I 1 9 3 - 5B...
  • Page 165 C 1 4 M ^ U 1 4 8 d ^ R 1 4 8 1 482 g g 1484 S | f B1480 Q1482 ^ 5 C R 1492 £CCCCR 1491 I l S S r R 1 4 8 2 RX1487 R I486 CR 1495 R1497 R1487 C l 482...
  • Page 166 1 MHz 1 kHz C A L 5 V R 21 3 0 R 2100 R2105 R2101 R2139 C2109 R2108 R2102 R2107 Q2106 Q2112 R2112 Q 2124 Q 2 1 14 R 2 1 2 4 Q 2 1 24 R2134 L2117 Fig.
  • Page 167 PK&-7 -|«v TWAINS BOARD PARTIAL AI2. • A 8 5 O S C I L L O S C O P E e > R E V . B ,A U & . I9 T S CALI BR.ATOR. AND FAN ClfcC U |T<g> It- »*-H I I 9 3 - &...
  • Page 168 “■ 2 u J % tP Z u. - « « r 7 < d-» U - O ' (0 u > > > 4 8 5 O S C I L L O S C O P E...
  • Page 169 Following is an example of the indentation system Tektronix, Inc. Field Office or representative. used in the description column Changes to Tektronix instruments are sometimes made to 1 2 3 4 5 Name & Description accommodate improved components as they become available,...
  • Page 170 Replaceable Mechanical Parts—485 CROSS IN D E X -M F R . CODE NUMBER TO MANUFACTURER Mfr. Code Manufacturer Address City, State, Zip OOOBK STAUFFER SUPPLY 103 SE TAYLOR PORTLAND, OR 97219 OOOOA LEMO USA 2015 2ND STREET BERKLEY, CA 94710 00779 AMP, INC.
  • Page 171 Replaceable Mechanical Parts— 485 Fig. & Index Tektronix Serial/Model No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Mfr Part Number Code 1 ADAPTER, CAMERA: 80009 200-1268-01 200-1268-01 (ATTACHING PARTS) 211-0195-00 SCREW,MACHINE:4-40 X 0.875 INCH,STL 83385...
  • Page 172 Replaceable Mechanlcal Parts—485 Fig. & Index Tektronix Serial/Model No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number PANEL,FRONT:485 80009 333-1476-00 1-36 333-1476-00 PANEL,FRONT:485-l 80009 333-1476-01 333-1476-01 PANEL,FRONT:485-2 80009 333-1476-02 333-1476-02 1 LAMPHOLDER: GRATICULE...
  • Page 173 Replaceable Mechanical Parts—485 Fig. & Index Tektronix Serial/Model No. Qty 1 2 3 4 5 Name & Description Code Mfr Part Number Part No. Dscont RES., VAR: (SEE R1300 EPL) 1-78 (ATTACHING PARTS) 2X20224-402 1 NUT,PLAIN,HEX.:0.25-32 X 0.312 INCH.BRS 73743 210-0583-00 WASHER.FLAT:0.25 ID X 0.375 INCH OD.STL...
  • Page 174 131-0679-01 B131950 . CONNECTOR,RCPT, :BNC W/HARDWARE 24931 28JR168-1 (ATTACHING PARTS) -147 361-0424-00 B010100 B131949X 361-0424-00 . SPACER,RING:0.515 ID X 0.625 OD X 0.85"TH 80009 *485 and 485-1 only. 2485-2 only. *A6 replaces A5 in 485-2 only. REV. G AUG. 1977...
  • Page 175 ACTUATOR,SL SW:DUAL SPDT,CKT BD MTG 80009 214-1575-00 -182 214-1575-00 SLIDE,GUIDE:SWITCH ACTUATOR 80009 351-0180-00 -183 351-0180-00 B010100 B019999 • EXTENDER,RET RAC: 80009 214-1190-00 -184 214-1190-00 ^A2 replaces A1 in 485-2 only. 2A4 replaces A3 in 485-2 only. REV. H APRIL 1978...
  • Page 176 -214 214-0291-00 80009 (ATTACHING PARTS) 211-0590-00 1 SCREW,MACHINE:6-32 X 0.25 INCH.PNH STL 83385 -215 1 NUT,PLAIN,EXT W:6-32 X 0.312 INCH,STL -216 210-0457-00 83385 1 TERMINAL,LUG:SE #6 78189 2104-06-00-2520N -217 210-0202-00 ^485 and 485-1 only 2485-2 only REV. H APRIL 1978...
  • Page 177 Replaceable Mechanical Parts—485 Fig. & Index Tektronix S erial/M odel No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number Part No. 337-1496-00 80009 1-218 337-1496-00 SHLD,ELECTRICAL: CRT 1 SUPPORT,CRT:REAR 80009 386-2246-00 -219 386-2246-00 80009...
  • Page 179 485/R485 OSCILLOSCOPE REV. D MAR 1977...
  • Page 180 Replaceable Mechanical Parts—485 Fig. & Index Tektronix Serial/M odel No. Part No. Dscont Qty i 2 3 4 5 Name & Description Code Mfr Part Number B010100 B049999 SHIELD,ELEC:HIGH VOLTAGE 80009 337-1495-00 337-1495-00 337-1495-01 B050000 SHIELD,ELEC:HIGH VOLTAGE SUPPLY 80009 337-1495-01...
  • Page 181 . CONTACT,ELEC:0.46 INCH LONG 47350 131-0589-00 22526 47357 131-0608-00 . TERMINAL,PIN:0.365 L X 0.25 PH.BRZ GOLD PL 80009 131-1003-00 131-1003-00 . CONNECTOR BODY,: CKT CD MT,3 PRONG *A9 replaces A8 in 485-1 and 485-2 instruments. 9-11 REV. I APRIL 1978...
  • Page 182 Parts—485 Replaceable Mechanical Fig. & Index Tektronix Serial/M odel No. Part No. Dscont Qty Name & Description 1 2 3 4 5 Code Mfr Part Number 136-0252-04 B010100 B091529 SOCKET,PIN TERM:0.188 INCH LONG 22526 75060 • 136-0252-04 B091530 SOCKET,PIN TERM:0.188 INCH LONG...
  • Page 183 Parts— Replaceable Mechanical Fig. & Index Tektronix Serial/M odel No. Oscont Qty 3 4 5 Name & Description Code Mfr Part Number Part No. SHIELD ,ELEC : INVERTER 80009 3 3 7 -1 6 6 5 -0 0 B010100 B049999...
  • Page 184 REV. C MAR 1976 4 8 5 /R485 OSCILLOSCOPE...
  • Page 185 Replaceable Mechanical Parts—485 Fig. & Index Tektronix Serial/M odel No. Part No. Oscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number . SOCKET,PIN TERM:0 .0 6 7 INCH D IA 00779 B010100 B142799 8 6 2 8 1 -2...
  • Page 186 Replaceable Mechanical Parts—485 Fig. & Index Tektronix Serial/M odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number 2 1 0 -0 4 0 6 -0 0 B010100 B049999 N U T ,P L A IN ,H E X .:4 -4 0 X 0 .1 8 8 INCH,BRS...
  • Page 187 348-0031-00 -239 348-0031-00 B010100 B079999X 1 GROMMET,PLASTIC:0.375 INCH DIA 80009 348-0056-00 -240 348-0056-00 3 CLAMP,LOOP:PRESS MT,PLASTIC 80009 343-0213-00 -241 343-0213-00 1 CLAMP,LOOP:0.062 INCH DIA 343-0088-00 343-0088-00 80009 ^485 only 2485-l and 485-2 only. 9 1 6 REV. H APRIL 1978...
  • Page 188 Replaceable Mechanical Parts— 485 Fig. & Index Tektronix Serial/M odel No. M fr Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number 2-242 220-0547-01 NOT,BLOCK:0.38 X 0.2S X 0.282"OA 80009 220-0547-01 (ATTACHING PARTS FOR EACH)
  • Page 189 Replaceable Mechanical Parts—485 Fig. & Tektronix Serial/M odel No. Index Mfr Part Number Part No. Dscont Qty 1 2 3 4 5 Name & Description Code . SETSCREW:3-48 X 0.062 INCH,HEX SOC STL 71159 213-0239-00 380-0258-00 B010100 B079999 1 HSG,AIR FILTER:...
  • Page 190 Replaceable Mechanical Parts—485 Fig. & Index Tektronix Serial/M odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number . TERMINAL, LUG :SE #4 78189 2104-04-00-2520N 2-306 210-0201-00 (ATTACHING PARTS) 83385 . SCREW,MACHINE:4-40 X 0.188 INCH,PNH STL...
  • Page 191 Replaceable Mechanical Parts— Fig. & Index Tektronix Serial/M odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number 80009 200-1251-00 200-1251-00 l COVER,OSCP:FRONT 30009 200-0802-00 2 COVER,HDL LATCH:2.12 DIA X .7,ACETAL 200-0602-00...
  • Page 192 012-0092-00 011-0049-01 80009 NTOK.IMPD MATC :50 OHM FEEDTHRU 011-0049-01 80009 070-1194-00 070-1194-00 MANUAL, TECH OPERATORS 070-1193-00 80009 MANUAL,TECH INSTRUCTION 070-1193-00 386-0118-00 80009 SHIELD,IMPLOSION: 386-0118-00 71400 AGC 3 FUSE,CARTRIDGE:3A G ,3A,2 50V,FAST BLOW 159-0015-00 REV. A MAR 1977 485/R 485 OSCILLOSCOPE...

  • Page 193: Change Information

    MANUAL CHANGE INFORMATION A t T e k tro n ix , we c o n tin u a lly strive to keep up w ith latest e le c tro n ic developm ents by adding c irc u it and c o m p o n e n t im provem ents to o u r in stru m e n ts as soon as they are developed and tested.
  • Page 194 CALIBRATION TEST EQUIPMENT REPLACEMENT Calibration Test Equipment Chart This chart compares TM 500 product performance to that of older Tektronix equipment. Only those characteristics where significant specification differences occur, are listed. In some cases the new instrument may not be a total functional replacement. Additional support instrumentation may be needed or a change in calibration procedure may be necessary.
  • Page 195 C H A N G E : D E S C R IP TIO N EFF SN B155790 ELECTRICAL PARTS LIST AND SCHEMATIC CHANGES CHANGE TO: 670-1512-02 CKT BOARD ASSY:HI Z(485,485-1) 317-0047-00 RES.,FXD,CMPSN:4.7 OHM,5%,0.125W ADD: 151-0188-00 TRANSISTOR:SILICON,PNP.2N3906 315-0681-00 RES.,FXD,CMPSN:680 OHM,5%,0.25W...
  • Page 196 MANUAL CHANGE INFORMATION TEKTRONIX 8 M35808 C H A N G E R E F E R E N C E p n n n n r T ..■ com m lttecj lQ 070-1193-00 2-5-79 REV. D A T E...

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R485

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