Tektronix 1720 Instruction Manual
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Tektronix 1720 Instruction Manual

Vectorscope
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Enlarged version
Instruction Manual
1720/1721
Vectorscope (S/N B060000 & Above)
070-5846-06
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

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  • Page 1 Instruction Manual 1720/1721 Vectorscope (S/N B060000 & Above) 070-5846-06 Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to...
  • Page 2 Copyright Tektronix, Inc., 1986, 1990, 1993, 1995. All rights reserved. Printed in U.S.A. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published ma- terial. Specifications and price change privileges reserved. The following are registered trademarks: TEKTRONIX and TEK.
  • Page 3 In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expi- ration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.

  • Page 5: Table Of Contents

    2–6 Using the 1720/1721 in Auxiliary Mode ........
  • Page 6 ......... 4–15 1720/1721...
  • Page 7 ......... . 6–15 1720/1721...
  • Page 8 Section 10 Replaceable Mechanical Parts ........10–1 1720/1721...
  • Page 9 ... . 2–20 Figure 2-17: A simulation of a part of the 1720 graticule showing the differential phase and gain measurement scales with approximately 10 differential Phase (dP)..
  • Page 10 ........6–5 Figure 6-2: Multiple pin connectors used in the 1720/1721 Waveform Monitors ...
  • Page 11 Table 6–6: High Voltage Oscillator Test Points ....... . . 6–13 1720/1721...

  • Page 12: General Safety Summary

    Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. Symbols and Terms Terms in this Manual. These terms may appear in this manual: viii 1720/1721...
  • Page 13 Symbols on the Product. The following symbols may appear on the product: (Cut safety symbols that do not pertain to this product) Double Protective Ground CAUTION WARNING Not suitable for Insulated (Earth) Terminal Refer to Manual High Voltage connection to the public telecom- munications network 1720/1721...

  • Page 14: Preface

    Preface This manual documents the TEKTRONIX 1720/1721 Vectorscope. Information that applies to all instruments in the series refers to the 1720/1721. Information that applies to only specific instruments within the series refers to the model numbers of those instruments (i.e., 1720, 1721).
  • Page 15 Contents Section 9, Diagrams, contains servicing illustrations. These include adjustment locations, circuit board part locations, a block diagram, schematic diagrams, and waveforms. Parts locating tables are included that cross–reference the circuit board illustrations and the schematic diagrams. Section 10, Replaceable Mechanical Parts, includes ordering information and part numbers for all replaceable mechanical parts.
  • Page 16 Contents...

  • Page 17: Section 1 Introduction And Specification

    Introduction and Specifications...
  • Page 19 Channel A, Channel B, or both inputs. Synchronization can be either internal or external. The 1720/1721 offers a choice of individual displays of vectors or XY or both. The XY display, with accompanying graticule scale, allows this vectorscope to be used for stereo audio monitoring.

  • Page 20: Accessories

    Introduction Accessories The 1720/1721 is shipped with a set of accessories that are needed for its installation or day-to-day operation. These are the “Standard Accessories.” They are physically packaged in a small, cardboard carton within the packing box. In addition to the Standard Accessories, there are other accessory items that can be purchased from Tektronix, Inc., which will either enhance operation or help to...

  • Page 21: Safety Information

    Introduction Safety Information 1720/1721 instruments are intended to operate from an ac power source that will not apply more than 250 V rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor is essential for safe operation.

  • Page 22: Table 1-1: Signal Input

    4.43361875 MHz. Chrominance bandwidth Upper –3 dB point +500 kHz, 100 kHz Lower –3 dB point –500 kHz, 100 kHz Display Vector phase accuracy 1.25 Measured with color bar signal Vector gain accuracy Typically, 2.5% Quadrature phasing Typically, 0.5 1–4 1720/1721...
  • Page 23 At least .25” (6 mm) from center. Clamp stability 0.0156” (0.4 mm) or less. Center spot movement with PHASE control rotation. Variable GAIN range +14 dB to –6 dB of 75% color bar +5 to –0.5 amplitude. preset gain. 1–5 1720/1721...

  • Page 24: Table 1-3: Xy Mode

    Step Characteristic Performance requirement Supplemental information number Mains voltage ranges 90 – 250 V. Continuous range from 90 to 250 VAC. Mains frequency range 48 – 66 Hz. Power consumption 0.7 A maximum, 0.35 A (21.4 Watts) typical. 1–6 1720/1721...

  • Page 25: Table 1-6: Environmental Characteristics

    Official Journal of the European Union: EN 50081-1 Emissions: EN 55022 Class B Radiated and Conducted Emissions EN 50082-1 Immunity: IEC 801-2 Electrostatic Discharge Immunity IEC 801-3 RF Electromagnetic Field Immunity IEC 801-4 Electrical Fast Transient/Burst Immunity 1–7 1720/1721...
  • Page 26 As defined in IEC 1010–1. Rated for indoor use only. Safety Certification Compliance Temperature, operating: 0 to 50 C. Altitude (maximum operating) 2,000 meters. Equipment Type Test and measuring. Safety Class Class I (as defined in IEC 1010–1, Annex H) – grounded product. 1–8 1720/1721...

  • Page 27: Section 2 Operating Instructions

    Operating Instructions...

  • Page 29: Front-Panel Controls And Indicators

    Operating Instructions These instructions provide information about the front-panel controls, rear-panel connectors, the Operator’s Familiarization/Checkout Procedures, and discussions about vector and audio measurements using the 1720/1721. Front-Panel Controls and Indicators The front-panel controls and indicators consist of momentary contact push-but- ton switches, variable controls, and backlit switch selections.

  • Page 30: Input

    Holding this button in switches the MODE to a display of both vector and XY modes. In this mode both the VECT and XY nomenclature and rectangular indicators light up to indicate that the 1720/1721 has been switched to this mode of operation.

  • Page 31: Phase

    11. AUXILIARY Toggles between AUXILIARY and independent operation. In the AUXILIARY mode, a Line Strobe (to blank the 1720/1721 crt, for line selection) and data to actuate the front-panel setup is accepted from a companion 1730-Series. Back lighted nomenclature and a rectangular indicator both light to indicate that the instrument is under AUXILIARY control.

  • Page 32: Rear-Panel Connectors

    Rear-Panel Connectors Signal input, power input, Auxiliary Control In, XY Input, and Demod Out are all located on the 1720/1721 rear panel. Because of the similarity of the 1730-Series to the 1720/1721 rear panel, the word VECTORSCOPE appears at the top of the panel. See Figure NO TAG for locations of rear-panel connectors.

  • Page 33: Figure 2-2: 1720/1721 Rear Panel

    Figure 2-2: 1720/1721 rear panel. 1. AC POWER A standard ac plug receptacle for the 120 or 220 Vac power mains. Plug is compatible with any of the three power cord options available for the 1720/1721 Vectorscope. 2. DEMOD OUT A 75Ω...

  • Page 34: Using The 1720/1721 In Auxiliary Mode

    The 1720/1721 AUXILIARY mode allows the Input and Reference switching to follow the similar switches on the waveform monitor. For example, when the 1730-Series INPUT switch is changed from A to B, the 1720/1721 INPUT switch will also change to B. Even though the vectorscope switching...

  • Page 35: Ref Switching

    TEST, the 1730-Series switching will not take it out of that mode. LINE SELECT The 1720/1721 normal operation is full field. When it is used in AUXILIARY, the 1730-Series LINE SELECT switching controls the display on the vector- scope. It should be noted that the 1720/1721 has no line selection capability when it is not connected to a 1730-Series Waveform Monitor.
  • Page 36 OPERATOR’S CHECKOUT PROCEDURE The following procedure is provided as an aid in obtaining a display on the 1720/1721 Vectorscope, and may be used as a check of basic instrument operation. Only instrument functions are checked in this procedure. All checks can be made with a cabinet on and it is necessary to have all internal jumpers in the factory-set position.

  • Page 37: Figure 2-3: Signal Connection For The Operator's Checkout Procedure

    (Flat Field, 10 Step) Black Burst Signal (Sync and Burst only) If the XY operation of the 1720/1721 is to be checked, an audio signal is required. See the following: Audio Signal: (About 2 V between 1 and 100 kHz.) 1720/1721 (rear) 1410–Series (rear)

  • Page 38: Figure 2-4: 1720/1721 Typical Vector Display

    Operating Instructions 75% 100% 100% –I Figure 2-4: 1720/1721 typical vector display. Adjust the SCALE illumination control for the desired brightness. Note that the internal waveform graticule should be illuminated. 2–10 1720/1721...

  • Page 39: Figure 2-5: Modulated Staircase Waveform Shown On A 1721

    Operating Instructions 75% 100% 100% –I Figure 2-5: Modulated staircase waveform shown on a 1721. A 1720 would have what would appear to be an intensified burst. 2–11 1720/1721...

  • Page 40: Figure 2-6: Color Bar And Modulated Staircase Signals Both Displayed On A 1721

    Briefly push the INPUT button and check that the CH-A indicator is the only one lit and that only a vector display is present. 5. Select Reference Connect the black burst signal to the EXT REF loop-through input and terminate in 75Ω. See Figure NO TAG. 2–12 1720/1721...

  • Page 41: Figure 2-7: Connection For Using Black Burst Signal For External Reference

    Push the REF button and check that the front-panel EXT indicator lights. Check for a stable display of vectors (CH-A INPUT). Push and hold the REF button until the front-panel TEST indicator lights. Check for a test circle display. See Figure 2-8. Leave the 1720/1721 REF in TEST. 2–13 1720/1721...

  • Page 42: Figure 2-8: 1720/1721 Test Circle Display

    Operating Instructions 75% 100% 100% –I Figure 2-8: 1720/1721 test circle display. 6. Position Center Dot Use a small screwdriver to adjust the vertical and horizontal positioning controls. Check that there is sufficient range to move the dot through the geographic center of the display (the graticule center target).

  • Page 43: Measurement Applications

    Connect the audio signal, through the XY INPUT connector on the rear panel, to the +X input (pin 3). Set the 1720/1721 MODE to XY. Set up the audio signal amplitude for a horizontal trace that is long enough to reach across the graticule compass rose.

  • Page 44: Color Measurements

    180 for NTSC or 135 for PAL. The standard color phase vector diagram is shown in Figure 2-9 for NTSC and Figure 2-10 for PAL. MAGENTA YELLOW BURST BLUE –I GREEN CYAN Figure 2-9: NTSC standard color phase Vector diagram. 2–16 1720/1721...

  • Page 45: Figure 2-10: Pal Standard Color Phase Vector Diagram

    NTSC and Figure 2-12 for PAL), the colors represented by the vectors when they are within the targets are of 75% amplitude. If burst vector amplitude corresponds to the 100% marking and the chrominance vectors are within the target, the color amplitude is 100%. 2–17 1720/1721...

  • Page 46: Figure 2-11: Partial 1720 Graticule Showing The 75% Amplitude Burst Target

    SETUP SETUP 100% Figure 2-11: Partial 1720 graticule showing the 75% amplitude burst target, with and without setup compensation. Encoding. The hue and color amplitude information in the color television system is carried on a single subcarrier frequency: 3.579545 MHz for NTSC and 4.43361875 MHz for PAL.

  • Page 47: Functional Use Of The Vector Graticule

    The polar-coordinate-type of display, such as that obtained on the 1720/1721, has proven to be the best method for portraying these errors. Functional Use of the Vector Graticule...

  • Page 48: Figure 2-13: Fine Detail Of The 1720 Graticule Magenta Target

    50.68 2.5 IRE Figure 2-13: Fine detail of the 1720 graticule magenta target. On the 1721 graticule, each chrominance vector related to the +V burst terminates in targets that are in the shape of two boxes (a small box inside a large box).

  • Page 49: Figure 2-14: Fine Detail Of The 1721 Graticule Target

    50.65 Figure 2-14: Fine detail of the 1721 graticule target. On the 1720, the small marks at intervals along the I and Q axes denote the amplitudes of the chrominance components (see Figure 2-15). On the 1721, the small marks at intervals along the U and V axes denote the amplitudes of the U and V chrominance components (see Figure 2-16).

  • Page 50: Differential Gain And Phase Measurements

    In the reproduced picture, the hue will vary with the scene brightness. Differential gain and differential phase may occur separately or together. 2–22 1720/1721...

  • Page 51: Figure 2-17: A Simulation Of A Part Of The 1720 Graticule Showing The Differential Phase And

    10 differential Phase (dP). Differential gain (dG) and differential phase (dφ) measurements can be made using the graticule markings located at the outer edge of the B-Y axis (1720) or –U axis (1721). See Figure 2-18 for a differential gain measurement illustration and Figure 2-17 for a differential phase measurement illustration.

  • Page 52: Y Measurements

    90 cause the axis to rotate by 90 . Making Stereo Audio The graticule for the 1720/1721 has scales for measurement of stereo audio Phase Measurements phase. The dashed diagonal line is the measurement axis for errors less than 90 , it is terminated in amplitude targets that correspond to the length of X and Y axes.

  • Page 53: Looking At Incidental Carrier Phase Modulation

    Looking at Incidental The High-Gain X and Y inputs of the 1720/1721 can be used to look at ICPM Carrier Phase Modulation (Incidental Carrier Phase Modulation). ICPM is a change in carrier phase with a signal level change.
  • Page 54 Operating Instructions 2–26 1720/1721...
  • Page 55 Warning The following servicing instructions are for use only by qualified personnel. To avoid personnel injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. Refer to General Safety Summary and Service Safety Summary prior to performing any service.

  • Page 57: Service Safety Summary

    Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components. To avoid electric shock, do not touch exposed connections. s–1 1720/1721...
  • Page 58 Service Safety Summary s–2 1720/1721...

  • Page 59: Section 3 Installation

    Installation...

  • Page 61: Packaging

    Operating Options Not all installations are identical. In order to make operation of the 1720/1721 Vectorscope as flexible as possible there are internal jumpers that can be changed to provide operating flexibility. For example, it is possible to select CW Subcarrier for EXT REF instead of Composite Video or Black Burst.

  • Page 62: Figure 3-1: Plug Jumper Locations

    Single-ended high gain mode A3J921 X Input High Gain Balanced 600W input (factory preset) Single-ended high gain mode A3J245 Blanking Disable Normal Blanking (factory preset) CRT Blanking disabled A3A1 J100 Light Enable Lights Enabled (factory preset) Lights Disabled 3–2 1720/1721...

  • Page 63: Auxiliary Connector

    1730-Series Waveform Monitor. Line and Field selection information is provided to the vectorscope over the bus that is contained in this interface. Figure 3-3 and Table 3–2 show the AUXILIARY connector pin assignments. 3–3 1720/1721...

  • Page 64: Mechanical Installation

    This F02 cabinet is compat- ible with the TEKTRONIX BP1 battery pack, which can be used as a dc power source. The hole sizes and spacing are different from those of the 1700F00.

  • Page 65: Figure 3-4: 1700F00 Plain Cabinet

    Installation 8.250 6.875 0.688 Rear 5.105 0.156 Dia (4) 1.060 6.130 16.180 12.725 Bottom Side Figure 3-4: 1700F00 plain cabinet. 3–5 1720/1721...

  • Page 66: Securing The Instrument In Its Cabinet

    Without the mounting screws there is nothing to hold the instrument in the cabinet if it is tipped forward. The instrument is secured to the cabinet by two 6-32 Pozidrive screws, located in the upper corners of the rear panel. See Figure 3-6. 3–6 1720/1721...

  • Page 67: Rack Mounting

    Figure 3-6: Cabinet securing screws. Rack Mounting The optional 1700F05 side-by-side rack adapter, shown in Figure 3-7, consists of two attached cabinets. It can be used to mount the 1720/1721 and another half-rack width instrument in a standard 19-inch rack. 18.970 6.875...

  • Page 68: Figure 3-8: 1700F05 Rack Adapter Adjustment

    If only one section of the rack adapter is used, a 1700F06 Blank Panel can be inserted in the unused section. See Figure 3-9. The rack adapter and panel are available through your local Tektronix field office or representative. 1700F05 1700F06 Figure 3-9: 1720/1721 and 1700F06 blank panel.

  • Page 69: Custom Installation

    In both cases, allow approximate- ly 3 inches of rear clearance for BNC and power-cord connections. To mount the 1720/1721 safely, attach it to a shelf strong enough to hold its weight. Install the mounting screws through the four 0.156-inch diameter holes in the bottom of the 1700F00 cabinet.
  • Page 70 Installation 3–10 1720/1721...

  • Page 71: Section 4 Theory Of Operation

    Theory of Operation...

  • Page 73: Overview

    Overview The simplified block diagram shown in Figure 4-1 and the following paragraphs are intended to introduce the 1720/1721 Vectorscope in the broadest of terms. A full scale discussion of operation follows this overview. The 1720/1721 is a special purpose oscilloscope, designed to display the variations of phase in the NTSC or PAL color television signal.

  • Page 74: Block Diagram

    Nonvolatile Random Access Memory (NOVRAM), which makes it possible to return to the same front-panel condition should power be interrupted. If the 1720/1721 is being used as an auxiliary instrument to a 1730-Series Waveform Monitor, any stored vectorscope front-panel setup data is also in the NOVRAM.

  • Page 75: Section 4 Theory Of Operation

    Center dot To CRT blanking Blanking Figure 4-1: Simple block diagram of a 1720/1721 Vectorscope. Gain Cell The gain cell uses front-panel VAR GAIN and GAIN CAL settings and switching signals from the Microprocessor to adjust the chrominance gain prior to demodulation.

  • Page 76: Demodulators

    Switcher to control the Quad Phase input to the R–Y Demodulator. Demodulators The 1720/1721 employs quadrature demodulation, which consists of delaying the regenerated subcarrier by 90 to the R–Y (U) Demodulator. In the 1721, an additional 180 phase shift is achieved by switching the regenerated subcarrier to the –input of the demodulator.

  • Page 77: Circuit Descriptions

    EXT REF EXT REF VIDEO Video signal input to the 1720/1721 Vectorscope is through high-impedance bridging loop-through inputs. Gain is normalized by the Input Amplifiers prior to being input to the Gain Cell. The amount of amplification provided by the Gain Cell is controlled by the Gain Cal, Variable, and the choice of 75% or 100% amplitude color bars.

  • Page 78: Gain Cell

    Incoming signal, from the Input Amplifiers, is amplified and fed to the Lumi- nance and Chrominance Amplifiers. Output of the Luminance Amplifier drives the Sync Separator, which generates the H Sync used throughout the Vector- scope, and the Back Porch Sample that enables the Phase Lock Loop. 4–6 1720/1721...

  • Page 79: Reference Switch

    In PAL, with W987 installed and U986 removed, the Loop Phase Detector, U646, receives every burst and the Quadra- ture Phase Detector, U854, receives every other burst. 4–7 1720/1721...

  • Page 80: Sync Separator

    U646 is the Subcarrier Regenerator (Phase Lock) Loop Phase Detector. It is a Amplifier balanced demodulator, whose carrier input is driven by the VCXO CW sine wave. Its signal input is driven by burst chrominance from the Chroma 4–8 1720/1721...

  • Page 81: Quadrature Phase Detector And Amplifier

    Subcarrier Regenerator loop response. Any input voltage to U734A is amplified and biases the VCXO varicap, CR235. The Loop Balance control, R534, adjusts the Phase Locked Loop dc offset so that there is no phase shift when burst amplitude changes. 4–9 1720/1721...

  • Page 82: Pal Phasing

    The bias current for Q222 is inversely proportional to the stored level on C328. If the amplitude rises, Q334 reduces the gain; if the amplitude goes down, the gain increases, thus stabilizing subcarrier amplitude. 4–10 1720/1721...

  • Page 83: Diagram 3 Demodulator

    V-Axis Switcher The V-Axis Switcher reroutes the V-Axis Demodulator carrier input on alternate lines. In both the 1720 and the 1721, V-axis switching is enabled when the TEST function is selected from the front panel. In the 1721, V-axis switching is also enabled when the +V/PAL switch is in the +V position.

  • Page 84: Chrominance Demodulators

    U361 and Q362. U361 is an operational transconductance amplifier used in a sample-and-hold circuit. The demodulated R–Y chrominance drives the negative input (pin 2), while a voltage, controlled by the Vector Vertical Position control (R355), is the reference level to the positive input (pin 3). 4–12 1720/1721...

  • Page 85: Diagram 4 Deflection Amplifier

    Center Dot Comparators, to provide blanking when the crt beam is not deflected away from center screen. CRT blanking signals from Line Select, and the Microprocessor are combined with the vectorscope’s H rate sync to provide the blanking signal to the grid circuit. 4–13 1720/1721...

  • Page 86: Xy Input Amps

    1730-Series when it is a companion to the 1720/ 1721. When Line Sel Blank is high, the crt is blanked and the line select brightup circuitry is enabled. The line select blanking signal is low during the selected line to unblank the crt for that line.

  • Page 87: Diagram 5 Microprocessor

    Microprocessor The 1720/1721 is controlled by a ROM-based Microprocessor. U613 is an 8-bit Microcontroller that operates either with U624 (early serial numbers, a 4k X 8 EPROM) or contains its own masked ROM. Pins 32 through 39 of U613 (AD0–AD7) is a multiplexed address and data bus.

  • Page 88: Table 4-1: U613 Switching Control Outputs

    High Test Circle Display Selected CRT Blanked for Real Time Switching High PAL (+V Switcher Off) Selected (1720 Default Mode) +V (+V Switcher On) Selected U818B is a buffer to isolate the Auxiliary port Transmit Data (TXD) from the Microprocessor.

  • Page 89: Diagram 6 Control Circuit

    (pin 8) is shut off and the Z-Axis Amplifier (Diagram 5) blanks the crt. In Line Select mode (which requires an external blanking pulse, input through the Auxiliary connector, from a 1730-Series or other source) the intensity setting 4–17 1720/1721...

  • Page 90: Trace Rotation

    The + and –15 V supplies generated on the Power Supply circuit board are further regulated to meet the on-board needs of the 1720/1721 Main (A3) circuit board. U164 and U172 are the post regulators for the –11.8 V and +11.8 V supplies.

  • Page 91: Diagram 7 Low Voltage Power Supply

    L4 and C44. DS4, R93, and R94 form a line voltage indicator. R91 and R92 charge C42. C42 provides power to U5 until the primary housekeeping winding provides power through CR17. 4–19 1720/1721...

  • Page 92: Output Filters

    R81 slows the turn-on of the switcher mosfet while CR27 speeds up the turn off. Output Filters The three output windings supply four output voltages. Each output is rectified by a single diode and filtered by an LC pi filter. 4–20 1720/1721...

  • Page 93: Error Amplifier

    +5.5 V, VR3 will start to conduct. When VR3 is drawing enough current through R13 to raise SCR Q11 gate voltage above its cathode by approximately 0.7 V, Q11 will turn on. This shorts the +5 V output to ground, forcing the primary circuit into current limit. 4–21 1720/1721...

  • Page 94: Diagram 8 High Voltage Power Supply

    Power Supply CR4 is the high voltage rectifier. Filter capacitors C3, C4, and C8 work with Outputs CR4 to provide –2530 V to the crt cathode. U1 is a four-times multiplier providing +11 kV to the crt anode. 4–22 1720/1721...

  • Page 95: Focus Amplifier

    Negative Z-Axis input current will cause the output to go positive. Q5 is a current amplifier feeding the output stage. Q3 and Q4 form a push-pull output stage. Q3 acts as a 2.7 mA constant current pull-up, while Q4 is the 4–23 1720/1721...
  • Page 96 The pinout for the CRT is shown in Figure 4-3. Description 1........Filament (f) 2........Cathode (k) 3........GRID (g1) 4........FOCUS (g3) 5........ASTIG (g4) 6........GEOM (g5) 7......VERT PLATE (y2) 9......VERT PLATE (y1) 11......HORIZ PLATE (x2) 12......1st ANODE (g2) 13......HORIZ PLATE (x1) 14........Filament (f) Figure 4-3: Pinout of the CRT Socket 4–24 1720/1721...

  • Page 97: Section 5 Checks And Adjustments

    Checks and Adjustments...

  • Page 99: Recommended Equipment List

    Color test signals for the television standard of the monitor to be tested: color bar signal, linearity staircase and variable APL, and black burst signal. For example: NTSC TEKTRONIX 1410 with Option AA and Option AB (modified SPG2 and TSG7) and TSG3.

  • Page 100: Section 5 Checks And Adjustments

    Checks and Adjustments PAL TEKTRONIX 1411 with Option AA and Option AB (modified SPG12 and TSG11) and TSG13. PAL-M TEKTRONIX 1412 with Option AA and Option AB (modified SPG22 and TSG21) and TSG23. The 1410, 1411, and 1412 Option AA are mainframes with modified SPG2, 12, and 22 Sync Generators with the added features of: Variable Subcarrier Frequency ( 20 Hz, 50 Hz for the 1410;...

  • Page 101: Auxiliary Equipment

    For example: Wide Band Enginering Part No. A56T75B 11. 75Ω Terminators (three required; two should be feed-through types) For example: End-line, 75Ω terminator (Tektronix Part No. 011-0102-00), and a feed-through, 75Ω terminator (Tektronix Part No. 011-0103-02). 12. 75Ω Coaxial Cable For example: 42 inch RG59U (Tektronix Part No.
  • Page 102 Matched length of the two arms within 0.1 inch. For example: Tektronix Part No. 067–0525–02. 15. Precision 50Ω Coaxial Cable Tektronix Part No. 012–0482–00 (used with the TEKTRONIX SG503). 16. 50Ω to 75Ω Minimum Loss Attenuator Tektronix Part No. 011–0057–00.

  • Page 103: Performance Check Procedure Short-Form Reference

    Check XY Input Phase Matching Less than a trace width of separation at 100 kHz. 5–14 Check XY Frequency Response The –3 dB point at 500 kHz or greater in standard mode; 5–15 100 kHz or more in High Gain mode. 5–5 1720/1721...

  • Page 104: Performance Check Procedure

    REQUIREMENT – Stable operation over an ac input range of 90 - 250 V. a. Turn on the 1720/1721 and adjust the controls for a useable display. b. Vary the autotransformer from low-line to high-line voltage (90 - 132 V for 110 V, or 180 - 250 V for 220 V operation).

  • Page 105: Figure 5-2: Loop–Through Connection Of Black Burst Signal To Both Ext Ref And Ch-B

    Black burst 75W Termination Figure 5-2: Loop-through connection of black burst signal to both EXT REF and CH-B. b. Use the 1720/1721 PHASE control to place the burst vector tip(s) on the graticule target(s). c. Remove the 75Ω terminator from CH-B.

  • Page 106: Figure 5-3: Using The Vector Graticule –3 Db Markings To Measure Bandwidth

    REQUIREMENT – Vector Phase accuracy within 1.25 . Vector Gain accuracy typically within 1.25 IRE (NTSC or PAL-M) or 2.5% (PAL). a. Set the 1720/1721 REF to INT. b. Connect the color bar to the CH-B INPUT and terminate the remaining side of the loop-through with a 75Ω...
  • Page 107 Change the generator’s subcarrier frequency by 50 Hz ( 10 Hz for PAL and PAL-M). c. CHECK – that the 1720/1721 locks to the generator within 1 second at these frequencies. d. CHECK – that the vectorscope display does not change by more than 2 at these frequencies.

  • Page 108: Figure 5-4: Signal Connection For Checking Ch-A/Ch-B Phase Matching

    Checks and Adjustments 1720/1721 (rear) 1410–Series (rear) Color bar Black burst 75W Termination Feed–through terminator Figure 5-4: Signal connection for checking CH-A/CH-B phase matching. b. CHECK – that the CH-A to CH-B phase match is within 0.5 . c. Remove the black burst signal from the EXT REF INPUT. Move the connection from CH-A to the EXT REF.
  • Page 109 Connect the Black Burst output of the Television Signal Generator to the 1720/1721 CH–B INPUT connector. DO NOT terminate this loop- through connector. b. Press the 1720/1721 VARIABLE push button, and turn the VARIABLE gain control. c. CHECK – that the burst vector can be adjusted to its 75% amplitude target.
  • Page 110 Checks and Adjustments g. Disconnect the Black Burst signal and the terminators from the 1720/1721. 11. Return Loss Requirement – Video Inputs: w40 dB to 6 MHz. Power on or off.. NOTE. Return Loss Check: The Return Loss Check needs to be done only if repairs have been made on the Input circuitry.
  • Page 111 12. Check Trace Rotation Range REQUIREMENT – Range greater than 1 from horizontal. a. Connect the Function Generator output to pin 3 (+X) of the 1720/1721 rear-panel XY INPUT connector, using an alligator clip to bnc adapter. Connect the red alligator clip to pin 3. See Figure 5-5.

  • Page 112: Figure 5-5: Rear-Panel Xy Input Connector Showing Inputs

    (+) on the diagonal line. c. Set the Audio Signal Generator frequency to 100 kHz. d. CHECK – that there is a trace width or less separation in the diagonal display. See Figure 5-6. 5–14 1720/1721...

  • Page 113: Figure 5-6: Audio Frequency Xy Display

    CHECK – that the display reaches the –3 dB gaps in the horizontal axis or beyond. See Figure 5-3. e. Move the Function Generator output to pin 7 (+Y) of the 1720/1721 rear-panel XY INPUT connector. Set the Function Generator to 50 kHz and set its amplitude for a display the height of the compass rose.
  • Page 114 High Gain mode. Connect the Function Generator output to pin 11 (+X HIGH GAIN) and ground pin 9 (+X) of the 1720/1721 rear-panel XY INPUT connector. See Figure 5-5. Set the Function Generator frequency to approximately 10 kHz and adjust its amplitude for a display equal to the width of the graticule compass rose.

  • Page 115: Adjustment Procedure

    R702 R703 R846 (9) R948 (9) Figure 5-7: Adjustment and test point locations for 1720/1721 Vectorscope. Numbers in parentheses correspond to adjustment steps. Signal Connections Connect the black burst signal to the 1720/1721 EXT REF INPUT. Connect the color bar signal to the 1720/1721 CH-A INPUT and CH-B INPUT through a dual input coupler with an in-line 75Ω...

  • Page 116: Adjustment Procedure Short-Form Reference

    75W Termination Figure 5-8: Starting connections for the adjustment procedure. Connect the Function Generator to the 1720/1721 XY INPUT. See Figure 5-1 for a diagram of how to hook up the 15-pin D-type connector to calibrate the 1720/1721 Vectorscope. Set the Function Generator frequency to 50 kHz.

  • Page 117: Table 5-2: Adjustment Procedure Short-Form Reference

    Adjust XY Phasing C484 5–23 Adjust Loop DC Balance R534 5–23 Adjust Quad Phase and +V Balance C453, R453 5–23 Adjust R–Y and B–Y Gains R460, R655 5–24 Adjust 100% Gain R178 5–24 Adjust Line Select Focus R244 5–25 5–19 1720/1721...

  • Page 118: Long-Form Adjustment Procedure

    4. Adjust Trace Rotation and Orthogonality a. Switch the 1720/1721 MODE to XY. b. Connect the Function Generator red clip lead to pin 3 ( +X) on the rear panel X Y INPUT connector. Connect the Function Generator black clip lead to X Y INPUT pins 1 (–X) and 5 (–Y).

  • Page 119: Figure 5-9: Test Points And Adjustment Locations For The 11.8V Supplies

    Adjust R267 (+11.8 V ADJ) for +11.78 to +11.82 volts. 6. Adjust Lock-In Phase a. Connect the Television Signal Generator output to the 1720/1721 Vectorscope as shown in Fig. 5-8. b. Set the 1720/1721 INPUT to CH-B, MODE to VECTOR, and REF to INT. 5–21 1720/1721...
  • Page 120 Adjust R653 (Vector Horizontal Position) for the best dot overlay. e. Change the 1720/1721 MODE to VECTOR. Adjust the 1720/1721 front-panel horizontal and vertical position controls to center the dot at the graticule center mark. 8. Adjust Phase and Gain Match a.
  • Page 121 Connect the black burst signal to CH-A INPUT. Do not terminate. b. Switch INPUT to CH-A and MODE to VECT. c. Use the 1720/1721 PHASE control to place color burst directly on the burst axis. Color burst amplitude will be twice normal length because it is unterminated.
  • Page 122 14. Adjust 100% Gain a. Select 100% Amplitude Color Bars from the Television Test Signal Generator. b. Push the 1720/1721 100% BARS button. c. Adjust R178 (100% Gain) so that the test circle passes through the center of the RED and CYAN targets.
  • Page 123 Adjust R244 (LS Focus) for the best 1720/1721 display. Without a 1730-Series Waveform Monitor: Connect the output of the Function Generator to pin 7 of the 1720/1721 rear-panel AUXILIARY connector. g. Set the Function Generator for a narrow, negative-going, 10 V, 1 kHz pulse.
  • Page 124 Checks and Adjustments 5–26 1720/1721...

  • Page 125: Section 6 Maintenance

    Maintenance...

  • Page 127: Preventive Maintenance

    Crt. Clean the crt protective shield, light filter, and crt face with a soft, lint-free cloth dampened in denatured alcohol. Interior. Clean the interior of the instrument by loosening the accumulated dust with a dry, soft brush. Once the dirt is loosened remove it with low-pressure air 6–1 1720/1721...

  • Page 128: Visual Inspection

    Table 6–1: Static Susceptibility Relative Susceptibility Levels Voltage CMOS 100V – 500V 200V – 500V SCHOTTKY SIGNAL 250 V DIODES SCHOTTKY TTL 500 V HF BIPOLAR TRAN 400 to 600 V SISTORS JFETS 600 to 800 V 6–2 1720/1721...

  • Page 129: Performance Checks And Readjustments

    12 months, if used intermittently. This will help to ensure maximum performance and assist in locating defects that may not be apparent during regular operation. The Performance Check Procedure and the Adjustment Procedure are in Section 5. 6–3 1720/1721...

  • Page 130: Troubleshooting

    Adjustment Locations. The circuit board illustrations have the adjustments and test points called out as a calibration and troubleshooting aid. Assembly and Circuit Numbering. The circuit board assemblies are assigned assembly numbers. Figure 6-1 shows the circuit board assembly locations for this instrument. 6–4 1720/1721...

  • Page 131: Parts Lists

    Section 10 of this manual. An Accessories Illustration and accompanying parts list is also included in this section. Major Assembly Signals and power supply voltages are passed through the instrument with a Interconnection system of interconnecting cables. The connector holders on these cables have 6–5 1720/1721...
  • Page 132 (and the triangular marking) on the connector and the marking on the etched circuit board. A pin replacement kit including necessary tools, instructions, and replacement pins is available from Tektronix, Inc. Contact a Tektronix field office or representative for assistance in ordering this kit. Pin 1...
  • Page 133 6. Determine the extent of the repair. If the necessary repair is complex, it may be advisable to contact your local Tektronix field office or representative before continuing. If the repair is minor, such as replacing a component, see the parts list for replacement information.

  • Page 134: Specific Troubleshooting Procedures

    Besides having a sizeable area where dangerous potentials can be contacted, the type of circuitry employed can not be troubleshot by conventional means. WARNING. Read Instructions: Do not attempt to troubleshoot the 1720/1721 power supply without reading these instructions. Troubleshooting Procedure NOTE.

  • Page 135: Low Volts Supply

    Table 6–3: Low Volts Supply Voltages Test Point Voltage Range W1 – (+5 V) +4.88 to +5.12 V W4 – (+15 V) +14.0 to +16.0 V W3 – (–15 V) –14.0 to –16.0 V W2 – (+40 V) +39.0 to +41.0 V 6–9 1720/1721...
  • Page 136 Connect the negative output from the 20 VDC Power Supply to TP1. Connect the positive output to W2 (+40 V). The circuit should draw less than 20 mA. Excessive current draw can be caused by CR14 or Q6 (High Volts power supply). 6–10 1720/1721...

  • Page 137: Table 6-4: Control Circuit Test Points

    80 kHz repetition rate, 400 ns width, switching from 5 V to approximately 2 V c. Remove the clip lead from across C47. 5. Error Amplifier Check a. Connect the negative output from the variable DC power supply to TP1. Connect the positive output to W1 (+5 V). 6–11 1720/1721...

  • Page 138: High Volts Supply

    Unsolder and lift one end of R24. b. Power up the power supply. c. Using the digital multimeter, measure the voltage between TP1 and the collector of Q1. It should be approximately –140 V. d. Reconnect the lifted end of R24. 6–12 1720/1721...

  • Page 139: Table 6-6: High Voltage Oscillator Test Points

    Table 6–6: High Voltage Oscillator Test Points Circuit Location Voltage T1, pin 4 Approximately +40 V T1, pin 13 Less than +2 V U2, pin 2 Approximately +4.8 V U2, pin 6 +4 to +11 V CR9, cathode Approximately +100 V 6–13 1720/1721...

  • Page 140: Serial Port And Led Driver Diagnostics

    Measure the voltage at the anode end of CR3. It should be 50–150 V more negative than the reading from the anode of CR4. Serial Port and LED Driver A non-destructive diagnostic program is built into the 1720/1721. All that is Diagnostics required to perform these diagnostics is a male, 9-pin, sub-miniature D-type connector with pins 8 and 9 connected together.

  • Page 141: Corrective Maintenance

    Maintenance 5. Turn off POWER. This ends the Diagnostic Procedure. When the 1720/1721 is powered up again it will be operating in the normal vector- scope configuration. Corrective Maintenance NOTE. Solder: A 2% RMA flux content solder is recommended for making repairs in this instrument.

  • Page 142: Mechanical Disassembly/Assembly

    NOTE. Screw Types: All screws, unless otherwise noted, are TORX screws and can be removed with a T15 screwdriver tip (Tektronix part number 003–0966–00). The exception is #2 Pozidrive screws which can be removed with a #1 Pozidrive tip (003–0443–00).

  • Page 143: Graticule Light Removal And Replacement

    Needle-nosed pliers are not recommended. Replacement bulbs are supplied with this instrument as Standard Accessories. Additional bulbs can be purchased from Tektronix (see Replaceable Electrical Parts list) or from local electronics distribution sources. 1. Remove the bezel according to the preceding instructions.

  • Page 144: Crt Removal

    Ensure that the rubber manchet is on the back edge of the shield. 2. Slip the CRT part way back into position and feed the trace rotation wires (and plug) back through the hole in the Main board. 6–18 1720/1721...

  • Page 145: Removing The Rear Panel

    2. Unsolder the six bnc and one ground connection. (If 1700F10 Field Upgrade is installed, unsolder leads from the battery connector.) 3. Pull the rear panel free from the chassis; be careful not to pull the unsoldered wires. 4. To replace, reverse the procedure. 6–19 1720/1721...

  • Page 146: Removing The Front Panel Circuit Board

    4. To access the Front Panel board components: a. Remove the knobs from the front. b. Remove the four screws from the rear. c. The board should now separate from the front panel making the components accessible. 5. To re-assemble, reverse the procedure. 6–20 1720/1721...

  • Page 147: Removing The Main Board

    (blue and brown). 3. Slip the crt and trace rotation lead through the appropriate holes in the Main board. 4. Remove the eight screws that are holding the board in place. See Figure 6-6 for their locations. 6–21 1720/1721...

  • Page 148: Removing The Power Supply Board

    5. Use a #1 Pozidrive tip to disconnect the power on/off switch from the front casting. 6. Remove the seven screws that are holding the Power Supply board down. See Figure 6-7. 7. Remove the board by sliding it forward and lifting it up. 6–22 1720/1721...

  • Page 149: Repackaging

    Repackaging Identification Tag If the instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag to the instrument showing: 1. Owner (with complete address) and the name of the person at your firm that can be contacted.

  • Page 150: Figure 6-8: Repackaging

    Maintenance Figure 6-8: Repackaging 6–24 1720/1721...

  • Page 151: Section 7 Options

    Options...

  • Page 153: Options

    Section 10. Field Upgrade Kits Cabinets All of the Safety and EMI tests used to qualify the 1720/1721 were performed in a cabinet. There are two optional cabinets and a dual rack adapter available for 7–1...

  • Page 154: Plain Cabinet (1700F00)

    Ordering Any of these items can be ordered with the 1720/1721 instrument. In addition, these items are available, along with accessory items listed in this manual, from your nearest Tektronix field office or distributor. Be sure to include both the name and number of any Field Upgrade Kits ordered.

  • Page 155: Section 8 Replaceable Electrical Parts

    Replaceable Electrical Parts...

  • Page 157: Parts Ordering Information

    Replaceable Electrical Parts This section contains a list of the components that are replaceable for the 1720/1721. Use this list to identify and order replacement parts. There is a separate Replaceable Electrical Parts list for each instrument. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., Field...
  • Page 158 Chassis-mounted parts and cable assemblies have no assembly number prefix and are located at the end of the electrical parts list. Tektronix Part No. Indicates part number to be used when ordering replacement part from (Column 2) Tektronix.
  • Page 159 Mfr. Code Indicates the code number of the actual manufacturer of the part. (Code to name (Column 6) and address cross reference can be found immediately after this page.) Mfr. Part No. (Column 7) Indicates actual manufacturer’s part number. 8–3 1720/1721...
  • Page 160 2900 SEMICONDUCTOR DR SANTA CLARA CA 95051–0606 31918 ITT CANNON 8081 WALLACE RD EDEN PRAIRIE MN 55344–8798 SWITCH PRODUCTS 32997 BOURNS INC 1200 COLUMBIA AVE RIVERSIDE CA 92507–2114 TRIMPOT DIV 33095 SPECTRUM CONTROL INC 8061 AVONIA ROAD FAIRVIEW, PA 16415 8–4 1720/1721...
  • Page 161 JW MILLER DIV PO BOX 2859 7X318 KASO PLASTICS INC 11015 A NE 39th VANCOUVER WA 98662 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97077–0001 PO BOX 500 83701 ELECTRONIC DEVICES INC 21 GREY OAKS AVE YONKERS NY 10710–3205...
  • Page 162 TK2073 TOKYO AMERICA INC 565 W GULF ROAD ARLINGTON HEIGHTS IL 60005 TK2469 UNITREK CORPORATION 3000 LEWIS & CLARK WAY VANCOUVER WA 98601 SUITE #2 0JR04 TOSHIBA AMERICA INC 9775 TOLEDO WAY IRVINE CA 92718 ELECTRONICS COMPONENTS DIV 8–6 1720/1721...

  • Page 163: Section 8 Replaceable Electrical Parts

    80009 671289010 671–2890–11 B060000 B066636 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289011 671–2890–12 B066637 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289012 (1720 ONLY) 671–2890–10 B050000 B059999 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289010 671–2890–11 B060000 B066737 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289011 671–2890–12...
  • Page 164 CEEFM1H561M7 (100KHZ,20C) A1C43 281–0563–00 CAP,FXD,CERAMIC:MLC;0.47UF,20%,50V,0.150 X 0.290 04222 SA305E474MAA A1C44 285–1331–00 CAP,FXD,MTLZD:0.47UF,5%,400V TK1913 MKS4 .47/400/5 A1C45 281–0563–00 CAP,FXD,CERAMIC:MLC;0.47UF,20%,50V,0.150 X 0.290 04222 SA305E474MAA A1C46 283–0005–03 CAP,FXD,CER DI:0.01 UF,+80–20%,250V 04222 SR30VE103ZAATR2 A1C47 281–0563–00 671–2890–10 671–2890–11 CAP,FXD,CERAMIC:MLC;0.47UF,20%,50V,0.150 X 0.290 04222 SA305E474MAA 8–8 1720/1721...
  • Page 165 0J9R2 NE–2Q–11R–T A1DS2 150–0050–00 LAMP,GLOW:135V MAX,1.9MA,C2A–T,WIRE LEAD 0J9R2 NE–2Q–11R–T A1DS3 150–0050–00 LAMP,GLOW:135V MAX,1.9MA,C2A–T,WIRE LEAD 0J9R2 NE–2Q–11R–T A1DS4 150–0050–00 LAMP,GLOW:135V MAX,1.9MA,C2A–T,WIRE LEAD 0J9R2 NE–2Q–11R–T A1F1 159–0021–00 FUSE,CARTRIDGE:3AG,2A,250V,FAST BLOW 71400 AGC–2 *MOUNTING PARTS* 200–2264–00 CAP,FUSEHOLDER:3AG FUSES 61935 FEK 031 1666 8–9 1720/1721...
  • Page 166 RES,FXD,FILM:26.1K OHM.1%,0.2W,TC=T0MI 91637 CCF501G26101F A1R24 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A1R25 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A1R26 322–3452–00 RES,FXD,FILM:499K OHM,1%,0.2W,TC=TOMI,SMALL 91637 CCF50–2–G4993FT A1R27 322–3300–02 RES,FXD,FILM:13K OHM,0.5%,0.2W,TC=T2 91637 CCF501D13001D A1R28 322–3344–00 RES,FXD,FILM:37.4K OHM,1%,0.2W,TC=T0MI 91637 CCF501G37401F 8–10 1720/1721...
  • Page 167 91637 CCF50G37400F A1R77 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A1R78 322–3248–00 RES,FXD,FILM:3.74K OHM,1%,0.2W,TC=T0,T&R 91637 CCF50G37400F A1R79 322–3356–00 RES,FXD,FILM:49.9K OHM,1%,0.2W,TC=T0MI 91637 CCF501G49901F A1R80 322–3222–00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F A1R81 322–3121–00 RES,FXD:METAL FILM;178 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G178R0F 8–11 1720/1721...
  • Page 168 24546 OMA0207 670–9384–00 B050000 B059999 CIRCUIT BD ASSY:FRONT PNL,NTSC/PAL–M 80009 670938400 670–9384–01 B060000 CIRCUIT BD ASSY:FRONT PNL,NTSC/PAL–M 80009 670938401 (1720/1721PM ONLY) 670–9528–00 B050000 B059999 CIRCUIT BD ASSY:FRONT PNL,PAL 80009 670952800 670–9528–01 B060000 CIRCUIT BD ASSY:FRONT PNL,PAL 80009 670952801 (1721/1721PN ONLY) *ATTACHED PARTS* 352–0779–00...
  • Page 169 670–9528–00 670–9528–00 RES,VAR,NONWW:PNL,20K OHM,10%,0.5W 12697 CM45210 A2R412 311–2540–00 670–9528–01 RES,VAR,PNL:CP,20K OHM,20%,0.5W,LINEAR,W/ 12697 311–2540–00 GROUNDING LUG,0.5 IN DIA *ATTACHED PARTS* 366–1701–01 KNOB:GY,0.127 ID X 0.392 OD X 0.4 H 80009 366170101 214–4725–00 670–9384–01 SPRING:COMPRESSION SPRING,0.026,302 STAINLESS 8X345 214–4725–00 STEEL,0.313,+/–,0.0A0 8–13 1720/1721...
  • Page 170 ORDER BY DESC *END ATTACHED PARTS* A2S243 260–2300–00 SWITCH,SIG:SPST;PUSH,MOM,NO,W/GROUND TERM, 34361 B3F1152 MANUAL INSERTION,100 GRAMS,SILVER,SEALED *ATTACHED PARTS* 366–0616–00 PUSH BUTTON:0.585 X 0.3 X 0.150 7X318 ORDER BY DESC *END ATTACHED PARTS* A2S317 260–2300–00 SWITCH,SIG:SPST;PUSH,MOM,NO,W/GROUND TERM, 34361 B3F1152 MANUAL INSERTION,100 GRAMS,SILVER,SEALED 8–14 1720/1721...
  • Page 171 CIRCUIT BD ASSY:MAIN 80009 672122707 672–1227–09 B060000 B065974 CIRCUIT BD ASSY:MAIN 80009 672122709 672–1227–10 B065975 CIRCUIT BD ASSY:MAIN 80009 672122710 (1720 ONLY) 672–1228–08 B050000 B059999 CIRCUIT BD ASSY:MAIN 80009 672122808 672–1228–09 B060000 B066272 CIRCUIT BD ASSY:MAIN 80009 672122809 672–1228–10 B066273...
  • Page 172 A3C353 283–0638–00 672–0224–07 CAP,FXD,MICA DI:130PF,1%,500V TK0891 RDM15FD131F03 A3C356 281–0773–00 CAP,FXD,CERAMIC:MLC;0.01UF,10%,100V TK1743 CGB103KEX A3C361 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C362 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C363 290–0943–02 CAP,FXD,ELCTLT:47UF,20%,25VTAPED & REELED 55680 UVX1E470MDA1TD A3C368 283–0725–01 CAP,FXD,MICA DI:214PF,1%,500V,TAPE & AMMO PACK 09023 CDA15FD(214)F03 8–16 1720/1721...
  • Page 173 A3C523 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C532 281–0826–00 CAP,FXD,CERAMIC:MLC;2200PF,10%,100V,0.100 X TK1743 CGB222KEX A3C534 283–0628–01 CAP,FXD,MICA DI:410PF,1%,500VTAPE & AMMO PACK 09023 CDA15FD411F03 A3C536 283–0628–01 CAP,FXD,MICA DI:410PF,1%,500VTAPE & AMMO PACK 09023 CDA15FD411F03 A3C540 283–0645–01 CAP,FXD,MICA DI:790PF,1%,300V,TAPE & AMMO PACK 09023 CDA15FC791F03 8–17 1720/1721...
  • Page 174 04222 SA101C102MAA 0.170 A3C777 281–0765–00 CAP,FXD,CER DI:100PF,5%,100V 04222 SA102A101JAA A3C781 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C787 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C788 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C791 283–0638–00 672–1227–07 CAP,FXD,MICA DI:130PF,1%,500V TK0891 RDM15FD131F03 A3C791 283–0674–00 672–1228–08 CAP,FXD,MICA DI:85PF,1%,500V TK0891 RDM15FD850F03 8–18 1720/1721...
  • Page 175 27014 FDH9427 A3CR297 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A3CR357 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A3CR358 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A3CR428 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A3CR438 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A3CR474 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 8–19 1720/1721...
  • Page 176 108–0317–00 RDC<1.2 OHM,Q>55@2.5MHZ,SRF>30 MHZ,PWDRD IRON A3L337 108–0317–00 INDUCTOR,FXD:CUSTOM,PWR;15UH,10%,IDC<460MA, 0JR03 108–0317–00 RDC<1.2 OHM,Q>55@2.5MHZ,SRF>30 MHZ,PWDRD IRON A3L353 108–0317–00 INDUCTOR,FXD:CUSTOM,PWR;15UH,10%,IDC<460MA, 0JR03 108–0317–00 RDC<1.2 OHM,Q>55@2.5MHZ,SRF>30 MHZ,PWDRD IRON A3L433 108–1344–00 INDUCTOR,FXD:POWER;3.9UH,10%,I<0.555A,RDC<0.32 TK2058 SP0305–3R9K–2 OHM,Q>45,SRF>65MHZ A3L437 108–0317–00 INDUCTOR,FXD:CUSTOM,PWR;15UH,10%,IDC<460MA, 0JR03 108–0317–00 RDC<1.2 OHM,Q>55@2.5MHZ,SRF>30 MHZ,PWDRD IRON 8–20 1720/1721...
  • Page 177 TRANSISTOR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMPL 0JR04 2N3906 A3Q391 151–0188–00 TRANSISTOR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMPL 0JR04 2N3906 A3Q424 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0JR04 2N3904 A3Q434 151–0195–02 TRANSISTOR,SIG:BIPOLAR,NPN;25V,100MA,200MHZ,AMPL 04713 MPS6521 A3Q474 151–0195–02 TRANSISTOR,SIG:BIPOLAR,NPN;20V,100MA,150MHZ,AMPL 0JR04 2N3904 A3Q480 151–0347–00 TRANSISTOR,SIG:BIPOLAR,NPN;160V,600MA,100MHZ 0JR04 2N5551 A3Q481 151–0347–00 TRANSISTOR,SIG:BIPOLAR,NPN;160V,600MA,100MHZ 0JR04 2N5551 A3Q490 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0JR04 2N3904 8–21 1720/1721...
  • Page 178 RES,FXD:METAL FILM;68.1K OHM,1%,0.2W,TC=100 57668 CRB20 FXE 68R1 A3R144 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R152 307–0023–00 RES,FXD,CMPSN:4.7 OHM,10%,0.5W 50139 EB47G1 A3R157 322–3172–00 RES,FXD,FILM:604 OHM,1%,0.2W,TC=T0MI 91637 CCF501G604ROF A3R158 322–3258–00 RES,FXD:METAL FILM;4.75K OHM,1%,0.2W,TC=100 56845 CCF50–2–G4751FT A3R166 322–3172–00 RES,FXD,FILM:604 OHM,1%,0.2W,TC=T0MI 91637 CCF501G604ROF 8–22 1720/1721...
  • Page 179 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A3R281 322–3297–00 RES,FXD:METAL FILM;12.1K OHM,1%,0.2W,TC=100 91637 CCF501G12101F A3R282 322–3293–00 RES,FXD:METAL FILM;11K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G11001F A3R283 322–3185–00 RES,FXD:METAL FILM;825 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G825ROF A3R284 322–3185–00 RES,FXD:METAL FILM;825 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G825ROF 8–23 1720/1721...
  • Page 180 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R445 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R446 322–3258–00 RES,FXD:METAL FILM;4.75K OHM,1%,0.2W,TC=100 56845 CCF50–2–G4751FT A3R447 322–3385–00 RES,FXD:METAL FILM;100K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10002F A3R448 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F 8–24 1720/1721...
  • Page 181 91637 CCF501G499ROF A3R570 322–3277–00 RES,FXD,FILM:7.5K OHM,1%,0.2W,TC=T0 91637 CCF501G75000F A3R571 322–3246–00 RES,FXD,FILM:3.57K OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G35700F A3R574 322–3226–00 RES,FXD:METAL FILM;2.21K OHM,1%,0.2W,TC=100 91637 CCF501G22100F A3R575 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A3R576 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F 8–25 1720/1721...
  • Page 182 91637 CCF501G20000F A3R668 322–3210–00 RES,FXD:METAL FILM;1.5K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G15000F A3R669 322–3193–00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A3R670 322–3164–00 RES,FXD,FILM:499 OHM,1%,0.2W,TC=T0MI 91637 CCF501G499ROF A3R671 322–3239–00 RES,FXD,FILM:3.01K OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G30100F A3R672 322–3246–00 RES,FXD,FILM:3.57K OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G35700F 8–26 1720/1721...
  • Page 183 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R776 322–3243–00 RES,FXD:METAL FILM;3.32K OHM,1%,0.2W,TC=100 91637 CCF50–1–G33200F A3R777 322–3335–00 RES,FXD,FILM:30.1K OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G30101F A3R780 322–3281–00 RES,FXD:METAL FILM;8.25K OHM,1%,0.2W,TC=100 91637 CCF501G82500F A3R781 322–3250–00 RES,FXD:METAL FILM;3.92K OHM,1%,0.2W,TC=100 91637 CCF50–2F39200F A3R782 322–3232–00 RES,FXD,FILM:2.55K OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G25500F 8–27 1720/1721...
  • Page 184 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F A3R940 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R941 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R942 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R943 322–3318–00 RES,FXD,FILM:MET FILM;20K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20001F 8–28 1720/1721...
  • Page 185 160–4202–01 MICROCKT,DGTL:NMOS,MICROCONT,8–BIT,PRGM8051, 80009 160420201 DIP40.6,062–8494–00 *MOUNTING PARTS* 136–0757–00 SKT,DIP:PCB;FEM,STR,2 X 20,40 POS,0.1 X 0.6 CTR,0.175 H 00779 2–641606–3 X0.130 TAIL,BECU,TIN,ACCOM 0.008–0.015 X 0.014–0.022 *END MOUNTING PARTS* A3U640 156–0742–00 IC,LINEAR:BIPOLAR,OP–AMP;HIGH SLEW RATE 01295 LM318P A3U646 156–2460–00 IC,MISC:BIPOLAR,MOD/DEMOD;BALANCED 04713 MC1496P 8–29 1720/1721...
  • Page 186 *END MOUNTING PARTS* A3A1J100 131–4530–00 CONN,HDR:PCB;MALE,STR,1 X 3,0.1 CTR,0.230 00779 104344–1 MLG X 0.120 TAIL,30GOLD,BD RETENTION A3A1P100 131–0993–00 CONN,BOX:SHUNT;FEMALE,STR,1 X 2,0.1 CTR,0.385 H,30 22526 65474–006 GOLD,BLACK,JUMPER A3A1P200 131–2790–00 CONN,HDR:PCB;MALE,RTANG,1 X 2,0.15CTR,0.230 MLG X 22526 65595–102 0.120 TAIL,30 GOLD 8–30 1720/1721...
  • Page 187 154098300 (1720 ONLY) 154–0984–00 ELECTRON TUBE:CRT,FINISHED,D14–375GH/984;A853B 80009 154098400 (1721/1721PM/1721PN ONLY) 154–0983–16 ELECTRON,TUBE:CRT,FINISHED,D14–375WA/983 80009 154098316 (1720 OPTION 74 ONLY) 154–0984–16 ELECTRON,TUBE:CRT,FINISHED,D14–375WA/984 80009 154098416 (1721/1721PM/1721PN OPTION 74 ONLY) *ATTACHED PARTS* 131–6014–00 CA ASSY,CRT:DISCRETE,ANODE LEAD;CRT,1,22 20093 131–6014–00 AWG,30KV,UL3239,58MM DIA A NODE X 1.9 L,0.125 8–31...
  • Page 188 CRT CABLE 174–3511–01 CA ASSY,SP:DISCRETE,CPD,4,24 AWG, 8.0L,1X7,0.1CTR & 80009 174–3511–01 2, 24 AWG, 8.5L X STRAIN RELIEF PCB H DEFLECTION LEADS *ATTACHED PARTS* 343–0298–00 STRAP,RETAINING 0.25 DIA CABLE 85480 343029800 344–0111–00 INSUL,SPREADER:DEFL LEADS,POLYPROPYLENE TK1617 (QUANTITY 2) *END ATTACHED PARTS* 8–32 1720/1721...

  • Page 189: Section 9 Diagrams/Circuit Board Illustrations

    Diagrams/Circuit Board Illustrations...
  • Page 191 Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Y14.15, 1966 -- Drafting Practices.
  • Page 193 BLANK <2> SWITCH CONTROL LINE INTENSITY QUAD PHASE FOCUS <2> <2> CONTROL CONTROL DETECTOR BLANKING LINE SCHEMATIC DIAGRAM <4> <6> <6> SELECT NUMBER <n> <5> FRONT PANEL SCREWDRIV- FOCUS INTENS 1720 / 1721 VECTORSCOPE ER ADJ. FRONT PANEL KNOB...
  • Page 194 R173 R287 R596 C898 R174 R288 R702 C991 R289 R894 C992 R175 R896 C994 R177 R292 R178 R293 R990 CR297 R181 R294 R991 CR496 R182 R295 R992 R383 R994 L185 R183 R184 R384 U184A Q192 R185 R385 U184B 1720 /1721...
  • Page 195 6.2V R990 C991 C994 3.92K 100PF 2.2PF Q897 +11.8V C898 R994 47UF 15.0K Q994 <2> Q896 EXT_REF_VIDEO INPUT C992 2.2PF R896 3.01K R992 REAR -11.8V 15.0K PANEL R894 2.21K -11.8V PART OF A3 MAIN BOARD 1720/1721 VECTORSCOPE INPUT AMPLIFIER <1>...
  • Page 196 R741 R958 W987 L437 R683 W987 C596 CR486 Q632 R280 R549 R742 R967 L533 R684 C616 CR496 Q666 R281 R554 R743 R969 Y129 Y129 C632 Q670 R282 R557 R744 R971 Y707 L642 C637 CR518 Q671 R283 R558 R745 R972 1720/1721...
  • Page 197 Y129 3.579545MHZ 4.433619MHZ 3.575611MHZ U876D 0 OHM .1UF R691 R687 74LS00 10.0K 22.1K CR681 -11.8V R676 R883 R884 NOT INSTALLED IN 1720 47.5K 5.23K 39.2K Q680 C685 R686 C352 10.0K -11.8V .1UF -11.8V -11.8V Q685 <3> <3> <4> <3> -11.8V...
  • Page 198 U467 C873 R369 U659 C885 R664 C971 R453 R665 U757 C975 R454 R666 U774A C976 R455 R667 U884B R457 R668 U973 CR357 R458 CR358 R669 VR470 CR751 R459 R670 VR766 CR752 R460 R671 VR767 R462 R672 J972 R463 R750 1720/1721...
  • Page 199 3.32K U757 R752 3080E 8.25K R653 C750 Q761 HORIZ R750 .01UF C761 POSITION C752 .1UF -11.8V .1UF CR752 +11.8V C751 HORIZONTAL VECTOR -11.8V .1UF R768 CR751 10.0K CENTER DOT POSITION CLAMP PART OF A3 MAIN BOARD 1720/1721 VECTORSCOPE DEMODULATOR <3>...
  • Page 200 U446B R576 U446C P915 R578 U446D P916 U585A P917 R579 R581 U585B Q248 R582 U585C Q343 R583 U585D Q424 R602 U942A Q474 U942B Q480 R839 R840 U942C Q481 R841 U942D Q540 R842 Q541 R843 VR449 Q576 Q580 R846 R847 1720/1721...
  • Page 201 470PF SPARE JUMPERS R953 P915 P916 P917 R955 -11.8V J915 J916 J917 470PF 470PF -11.8V NOTE: SEE PARTS LIST FOR EARLIER VALUES A11 SERIAL FILTER BOARD PART OF A3 MAIN BOARD AND SERIAL NUMBER RANGES. 1720/1721 VECTORSCOPE DEFLECTION AMPLIFIER <4>...
  • Page 202 1, 2, 3, 4, and 6. Vi g C405 C505 C508 C512 C513 C616 C805 C806 CR519 P216 R212 R508 R518 R603 R605 R606 R609 R616 R722 R921 U311 U315 U319 U405 U505 U508 U613 U620 U624 U818A U818B U818C U818D W717 Y707 1720/1721...
  • Page 203 AUX_FP VAR_FP +V_FP B_FP 75%_FP CAL_FP VECT_FP INT_FP NOTE: CONNECT ACROSS PROCESSOR BETWEEN PINS 20 AND 40 WITH EVEN LEAD LENGTHS SEE PARTS LIST FOR EARLIER VALUES PART OF A3 MAIN BOARD AND SERIAL NUMBER RANGES MICROPROCESSOR <5> 1720/1721 VECTORSCOPE...
  • Page 204 R237 Board C709 R238 C718 R240 DS100 C940 R241 DS200 DS300 C946 R242 P100 C974 R243 P200 C982 R244 P800 R250 CR152 R254 CR157 CR162 R255 CR166 R259 CR167 R267 A3A1 Graticule Board Static Sensitive Devices See Maintenance Section 1720/1721...
  • Page 205 C376 C946 .1UF .1UF C523 C672 C709 C718 C974 C982 .1UF .1UF .1UF .1UF .1UF .1UF -15V -11.8V -11.8V NOTE: SEE PARTS LIST FOR EARLIER VALUES PART OF A3 MAIN BOARD AND SERIAL NUMBER RANGES 1720/1721 VECTORSCOPE CONTROL CIRCUIT <6>...
  • Page 206 Schematic Diagram <7> Component Locator Chart C110 L105 The schematic diagram has an alpha C120 L122 numeric grid to assist in locating parts C121 L221 C222 within that diagram. C223 Q100 C231 R100 Assembly A4. J100 R123 J112 R220 1720/1721...
  • Page 207 A_FP L221 R123 10UH 365.0 PAL_FP AUX_FP STUD +V_FP VAR_FP SIGNAL BOARD STATOR BOARD +V_FP B_FP R232 75%_FP CAL_FP CKT # 1720/1721 PAL-M 1721 VECT_FP INT_FP C110 267PF 180PF C120 1000PF 240PF TEST C121 270PF 120PF C222 15PF 10PF DS116B...
  • Page 208 CR28 CR29 within that diagram. R101 Assembly A1. Partial Assembly A1 R102 also shown on Diagram 9. CR10 CR11 CR12 CR13 CR14 CR15 CR16 CR17 CR18 CR19 CR20 CR21 CR22 CR23 R679 CR24 CR25 1720/1721...
  • Page 209 10.0 10.0 +5VC 3.74K .01UF CR16 10.00K SECONDARY GROUND 18.7K LINE SIDE COMMON (CHASSIS GROUND) PEAK DETECTOR NOTE: SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES. PART OF A1 POWER SUPPLY 1720/1721 VECTORSCOPE LOW VOLTS POWER SUPPLY <8>...
  • Page 210 A10 CRT Socket Board (Front of Board) CR15 CR16 CR17 CR18 CR19 CR20 CR21 CR22 CR23 CR24 CR25 CR26 CR27 CR28 CR29 CR30 CR31 FIL1 FIL2 A10 CRT Socket Board (Back of Board) Comp Diag Diag Comp Diag Diag Comp Diag Diag R101 R102 R103 1720/1721...
  • Page 211 VERT PLATE (y1) -15A (x1) HORIZ PLATE 499K 499K NOT INSTALLED (g2) 1st ANODE HORIZ PLATE (x2) <8> FOCUS NOTE: SEE PARTS LIST FOR EARLIER VALUES PART OF A1 POWER SUPPLY AND SERIAL NUMBER RANGES 1720/1721 VECTORSCOPE HIGH VOLTS POWER SUPPLY <9>...

  • Page 213: Section 10 Replaceable Mechanical Parts

    Replaceable Mechanical Parts...
  • Page 215 Replaceable Mechanical Parts This section contains a list of the components that are replaceable for the 1720/1721. Use this list to identify and order replacement parts. There is a separate Replaceable Mechanical Parts list for each instrument. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., Field...
  • Page 216 Figure & Index No. Items in this section are referenced by figure and index numbers to the illustra- (Column 1) tions. Tektronix Part No. Indicates part number to be used when ordering replacement part from (Column 2) Tektronix. Serial No.
  • Page 217 111 INDUSTRIAL RD COLD SPRING KY 41076–9749 7X318 KASO PLASTICS INC 11015 A NE 39th VANCOUVER WA 98662 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97077–0001 PO BOX 500 80126 PACIFIC ELECTRICORD CO 747 W REDONDO BEACH GARDENA CA 90247–4203...

  • Page 218: Section 10 Replaceable Mechanical Parts

    22670 ORDER BY DESC –4 378–0258–00 FLTR,CONTRASTIN:GRAY,POLYCARBONATE 80009 378025800 –5 333–3302–01 B050000 B059999 PANEL,FRONT:MAIN 80009 333330201 333–3302–02 B060000 PANEL,FRONT:MAIN FRONT PANEL,1720 80009 333–3302–02 (1720 ONLY) 333–3303–01 B050000 B059999 PANEL,FRONT:1721 80009 333330301 333–3303–02 B060000 PANEL,FRONT:FRONT PANEL,1721 80009 333–3303–02 (1721/1721PM/1721PN ONLY) *MOUNTING PARTS* –6...
  • Page 219 B066157 SCREW,MACH:6–32 X 0.375,PNH,STL,CDPL,T–15 TORX DR 0KB01 ORDER BY DESC 211–0720–01 B066157 SCREW,MACH:6–32 X 0.50,PNH,STL,TORX T–15 WITH SLOT 0KB01 211–0720–01 (1720 ONLY) 211–0721–00 B050000 B066408 SCREW,MACH:6–32 X 0.375,PNH,STL,CDPL,T–15 TORX DR 0KB01 ORDER BY DESC 211–0721–00 B066409 SCREW,MACH:6–32 X 0.375,PNH,STL,CDPL,T–15 TORX DR...
  • Page 220 129–1308–00 B066409 SPACER,POST 6–32 X 0.75 HEX,STL, CAD PL 00570 129130800 (1721/1721PM/1721PN ONLY) STANDARD ACCESSORIES 012–1422–01 CA ASSY,SP,ELEC:MLD,1720 60381 202M–2 070–5846–05 MANUAL,TECH:INSTRUCTION,1720 SERIES VECTORSCOPE TK2548 070–5846–05 150–0168–00 LAMP,INCAND:14V,0.08A,WEDGE BASE,T1.75FOR SKT MT 55335 159–0021–00 FUSE,CARTRIDGE:3AG,2A,250V,FAST BLOW 71400 AGC–2 –56 174–0183–00 CA ASSY,SP,ELEC:9,26 AWG,12.0 L,RIBBON...
  • Page 221 Name & description code Mfr. part no. 016–0475–00 VIEWING HOOD:1740 80009 016047500 200–3897–01 COVER,FRONT:1700F02,HOT STAMPED 80009 200389701 ––––––––––– CAMERA,SCOPE:C9 (OPTION 20 ONLY) ––––––––––– PLAIN CASE ASSY:1700F00 ––––––––––– PTD CASE ASSY:1700F02 ––––––––––– RACK ADAPTER:1700F05 ––––––––––– FILLER PANEL:1700F06 ––––––––––– DRAWER,UTILITY:1700F07 1720/1721 10–7...
  • Page 222 Replaceable Mechanical Parts 10–8 1720/1721...
  • Page 225 A3A1 1720/1721...

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