Tektronix 1725 Instruction Manual
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Tektronix 1725 Instruction Manual

Tektronix 1725 Instruction Manual

Pal/ntsc vectorscope
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5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Instruction Manual 1725 (SN B040000 and Above) PAL/NTSC Vectorscope 070-7635-04 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 3 Copyright Tektronix, Inc., 1991, 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 material. Specifications and price change privileges reserved. The following are registered trademarks: TEKTRONIX and TEK.
  • Page 4 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 6: Table Of Contents

    2–7 Using The 1725 In Auxiliary Mode ......... .
  • Page 7 ........... . 4–8 1725 PAL/NTSC Vectorscope...
  • Page 8 ......... 4–25 1725 PAL/NTSC Vectorscope...
  • Page 9 ..........6–15 1725 PAL/NTSC Vectorscope...
  • Page 10 ..........10–4 1725 PAL/NTSC Vectorscope...
  • Page 11 ........2–17 Figure 2–10: NTSC and PAL 75% and 100% burst targets on 1725 graticule ....
  • Page 12 ........5–24 Figure 5–13: Adjustment and test point locations for the 1725 Vectorscope ..... .
  • Page 13 ......... . . 6–13 1725 PAL/NTSC Vectorscope viii...
  • Page 14 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: 1725 PAL/NTSC Vectorscope...
  • Page 15 CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: Double Protective Ground CAUTION WARNING Not suitable for Insulated (Earth) Terminal Refer to Manual High Voltage connection to the public telecom- munications network 1725 PAL/NTSC Vectorscope...
  • Page 16 To avoid electric shock, do not touch exposed connections. X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the high-voltage circuitry or the CRT enclosure. X-ray emissions generated within this product have been sufficiently shielded. 1725 PAL/NTSC Vectorscope...
  • Page 17 Service Safety Summary 1725 PAL/NTSC Vectorscope...
  • Page 18 The procedures are preceded by a list of recommended test equipment. Each procedure has a short form listing of the individual steps. Section 6, Maintenance Section 6, Maintenance, includes preventive, troubleshooting, and corrective information. 1725 PAL/NTSC Vectorscope xiii...
  • Page 19 Section 10, Replaceable Mechanical Parts, includes ordering information and Mechanical Parts part numbers for all replaceable mechanical parts. This parts list is referenced to an exploded view mechanical drawing. Also included are lists of accessories and optional accessories. 1725 PAL/NTSC Vectorscope...

  • Page 20: Section 1 Introduction

    Introduction...
  • Page 22 Channel A or Channel B or both inputs. Synchronization can be either internal or external. The 1725 offers a choice of individual displays of vectors or X–Y or both. The X–Y display, with accompanying graticule scale, allows this vectorscope to be used for stereo audio monitoring.

  • Page 23: Accessories

    Introduction Accessories The 1725 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 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., that will either enhance operation or help to...

  • Page 24: Safety Information

    Option A4 Power, North America, 250 V/10 A (Power Cord and 2 Fuses). Option A5 Power, Swiss, 240 V/6 A (Power Cord and 2 Fuses). If the 1725 is ordered without specifying a Power Cord Option, it is shipped with a standard 3-prong, 120 volt power plug.

  • Page 25: Table 1-1: Signal And External Reference Inputs

    CHECK CHARACTERISTIC REQUIREMENTS SUPPLEMENTAL INFORMATION STEP Chrominance Processing Characteristics Nominal Subcarrier Frequency (F NTSC 3.579545 MHz. 4.43361875 MHz. Chrominance Bandwidth +500 kHz, ±100 kHz. Upper –3 dB Point -500 kHz, ±100 kHz. Lower –3 dB Point 1725 PAL/NTSC Vectorscope 1–4...
  • Page 26 With 140 IRE (1 V) composite video input. INT or EXT referenced. Display Characteristics ±1°. Differential Phase Measured with 140 IRE (1 V) linearity signal (5 step, 10 step, or Ramp) with 40 IRE (300 mV) of ±1%. Differential Gain subcarrier. 1–5 1725 PAL/NTSC Vectorscope...

  • Page 27: Table 1-3: X Y Mode

    STEP CHARACTERISTIC SUPPLEMENTAL INFORMATION CRT Viewing Area 80 X 100 mm. Accelerating Potential 13.75 kV. Greater than ±1° from horizon- Trace Rotation Range Total adjustment range is typically 8°. tal. Graticule Internal Vector, variable SCALE illumination. 1725 PAL/NTSC Vectorscope 1–6...

  • Page 28: Table 1-5: Power Source

    RF Electromagnetic Field Immunity IEC 801-4 Electrical Fast Transient/Burst Immunity Australia/New Zealand Complies with EMC provision of Radiocommunications Act per the following standard(s): Declaration of Conformity – EMC AS/NZS 2064.1/2 Industrial, Scientific, and Medical Equipment: 1992 1–7 1725 PAL/NTSC Vectorscope...
  • Page 29 Class 1 (as defined in IEC 1010-1, Annex H) – grounded product Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J) Pollution Degree Pollution Degree 2 (as defined in IEC 1010-1). Note: Rated for indoor use only. 1725 PAL/NTSC Vectorscope 1–8...

  • Page 30: Table 1-8: Physical Characteristics

    Introduction Table 1–8: Physical Characteristics CHARACTERISTIC SUPPLEMENTAL INFORMATION Dimensions Height 5 1/4 inches (133.4 mm). Width 8 1/2 inches (215.9 mm). Length 18 1/8 inches (460.4 mm). Weight 8.5 lbs (3.8 kg). 1–9 1725 PAL/NTSC Vectorscope...
  • Page 31 Introduction 1725 PAL/NTSC Vectorscope 1–10...

  • Page 32: Operating Instructions

    Operating Instructions...

  • Page 34: Section 2 Operating Instructions

    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 1725. Front-Panel Controls and Indicators The front-panel controls and indicators consist of momentary contact push-but- ton switches, variable controls, and back-lit switch selections.

  • Page 35: Input

    Holding this button in switches the INPUT to a display of both A and B Inputs. This display requires an external sync reference. Both the CH–A and CH–B indicators light when the 1725 has been switched to this dual input mode. If the internal phase shifter jumper has been changed to dual, one indicator will be flashing to indicate which input the front-panel PHASE control is working with.

  • Page 36: Gain

    Burst targets for both 75% and 100% amplitude color bars are on the graticule. Back lighted nomenclature, with rectangular indicators, lights to indicate which amplitude color bars the 1725 is set up to measure. PHASE 6. +V (PAL only) A momentary contact push-button switch that selects +V.

  • Page 37: Display

    11. AUXILIARY Toggles between AUXILIARY and independent operation. In the AUX- ILIARY mode, a Line Strobe (to blank the 1725 crt, for line selection) and data to actuate the front-panel setup is accepted from a companion 1730–Se- ries. Back lighted nomenclature, with rectangular indicators, lights to indicate that the instrument is under AUXILIARY control.

  • Page 38: Rear-Panel Connectors

    Signal input, power input, Auxiliary Control In, XY Input, and Demod Out are all located on the 1725 rear panel. Because of the similarity of the 1730–Series to the 1725 rear panel, the word VECTORSCOPE appears at the top of the panel.

  • Page 39: Bnc Connectors

    6. AUXILIARY A 9-pin connector used to interface with the 1730–Series. Auxiliary control consists of a signal line (Line Strobe) and a serial interface. The serial interface allows the 1725 to operate in conjunction with the 1730–Series Store/Recall function. 2–6...

  • Page 40: Power Input

    AUXILIARY 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 1725 INPUT switch will also change to B. Even though the vectorscope switching (INPUT and REF) follows the waveform monitor, the vectorscope INPUT and REF switches remain active so that they can be changed without changing the waveform monitor switching.

  • Page 41: Line Select

    Operator’s Checkout Procedure The following procedure is provided as an aid in obtaining a display on the 1725 Vectorscope, and may be used as a check of basic instrument operation. Only instrument functions are checked in this procedure. The Performance Check procedure, used to determine if the instrument is operating within performance requirements, is located in Section 5 of this manual.
  • Page 42 Operating Instructions signal source in preparing this procedure. The TEKTRONIX 1411–Series Television Test Signal Generator mainframe with Sync, Color Bar, and Linearity modules was used as the PAL signal source in preparing this procedure. 1. Initial Setup 1725 Vectorscope MODE...

  • Page 43: Figure 2-3: Initial Equipment Connections For Operators Checkout Procedure

    (REAR VIEW) Figure 2–3: Initial equipment connections for operators checkout procedure If the XY operation of the 1725 is to be checked, an audio signal is required. See the following: Audio Signal: About 2 V between 1 and 100 kHz.

  • Page 44: Figure 2-4: Typical 1725 Vector Display

    75% 100% 100% –I Figure 2–4: Typical 1725 vector display Adjust the SCALE illumination control for the desired brightness. Note that the internal waveform graticule is illuminated along with the marker in NTSC graticule target and the NTSC LED indicator.

  • Page 45: Figure 2-5: Modulated Staircase Waveform Shown On A 1725

    75% 100% 100% –I Figure 2–5: Modulated staircase waveform shown on a 1725 Briefly push the INPUT button and check that the CH–A indicator and the NTSC LED are lighted and that only a vector display is present. 5. Select Reference Push the INPUT to switch to CH-B and the REF button and check that the front-panel EXT indicator lights.

  • Page 46: Figure 2-6: 1725 Test Circle Display

    Operating Instructions 75% 100% 100% –I Figure 2–6: 1725 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). It should be noted that the amount of adjustment range varies from instrument to instrument.

  • Page 47: Measurement Graticule

    Connect the audio signal, through the XY INPUT connector on the rear panel, to the +X input (pin 3). Set the 1725 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 48: Measurement Applications

    The smallest targets are for NTSC vectors. Measurement Applications The 1725 is a vectorscope capable of making both chrominance and XY measurements. The information that follows is intended to guide both new and experienced users through simple and complex measurement techniques. The information is divided by major topics, which are then subdivided into specific measurements.

  • Page 49: Color Measurements

    If burst vector amplitude corresponds to the 75% amplitude marking (see Figure 2–10), 2–16 1725 PAL/NTSC Vectorscope...

  • Page 50: Figure 2-9: Pal Standard Color Phase Vector Target

    SETUP SETUP 100% Figure 2–10: NTSC and PAL 75% and 100% burst targets on 1725 graticule If burst vector amplitude corresponds to the 100% marking and the chrominance vectors are within the target, the color amplitude is 100%. 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...

  • Page 51: Functional Use Of The Vector Graticule

    The polar-coordinate-type of display, such as that obtained on the 1725, has proven to be the best method for portraying these errors. Functional Use of the Vector Graticule...

  • Page 52: Figure 2-11: Fine Detail Of The 1725 Graticule Magenta Target

    –V burst terminate in the smaller targets. The 1725 has small marks at intervals along the I and Q axes that denote the amplitudes of the chrominance components (see Figure 2–12). The small marks at intervals along the U and V axes denote the amplitudes of the U and V chrominance components (see Figure 2–13).

  • Page 53: Differential Gain And Phase Measurements

    In the reproduced picture, saturation will be distorted in the areas between the light and dark 2–20 1725 PAL/NTSC Vectorscope...

  • Page 54: Matching Color Signals

    (dF) High Resolution Differential Phase Measurement –– The DEMOD OUT from the 1725 can be used to drive one of the inputs to a 1730–Series Waveform Monitor for improved measurement resolution. This measurement requires a modulated ramp or staircase signal with the 1725 gain normalized so the chrominance amplitude is on the compass rose.

  • Page 55: Looking At Incidental Carrier Phase Modulation

    CH B there is no need to display against a graticule scale. Looking at Incidental The High-Gain X and Y inputs of the 1725 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 56: Figure 2-15: Measuring Stereo Audio Phase Difference In X And Y Axes

    Once both signal gains are normalized they can be displayed in the XY Mode and the relative stereo phase measured. See Figure 2–15. 75% 100% 100% –I Figure 2–15: Measuring stereo audio phase difference in X and Y axes 1725 PAL/NTSC Vectorscope 2–23...
  • Page 57 Operating Instructions 2–24 1725 PAL/NTSC Vectorscope...
  • Page 58 Warning The following servicing instructions are for use only by qualified personnel. To avoid personal 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 60: Section 3 Installation

    Installation...

  • Page 62: Packaging

    Mains Frequency and The 1725 Vectorscope operates over a frequency range of 48 to 66 Hz, at any Voltage Ranges mains voltage between 90 Vac and 250 Vac. These newer versions of the 1730–Series instruments do not require any internal changes to select their...

  • Page 63: Figure 3-1: Jumper Locations On The Main Board

    Normal Blanking (factory pre- set) CRT Blanking disabled A3J7 Y Input High Gain Balanced 600W input (factory preset) Single-ended high gain mode A3J6 X Input High Gain Balanced 600W input (factory preset) Single-ended high gain mode 1725 PAL/NTSC Vectorscope 3–2...

  • Page 64: Y Input Connector

    In addition, a single-ended, high-gain mode can be used for other, primarily non- audio, applications. It can be accessed by installing plug jumpers on A3J6 and A3J7 (on the Main board) and inputting the signal on the +X and +Y inputs with the –X and –Y inputs grounded. 1725 PAL/NTSC Vectorscope 3–3...

  • Page 65: Auxiliary Connector

    TXD (Transmit Data) 1725 return communication to 1730–Series. Mechanical Installation Cabinetizing All qualification testing for the 1725 was performed in a 1700F00 cabinet. To guarantee compliance with specifications, the instrument should be operated in a cabinet. The plain cabinet, 1700F00, is shown in Figure 3–4.

  • Page 66: Figure 3-4: Dimensions Of The 1700F00 Plain Cabinet

    This F02 cabinet is compatible 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 67: Securing The Instrument In Its Cabinet

    BOTTOM SIDE Figure 3–5: 1700F02 portable cabinet All of the 1700–Series metal cabinets, which are available from Tektronix as Optional Accessories, provide the proper electrical environment for the instrument. They supply adequate shielding, minimize handling damage, and reduce dust accumulation within the instrument.

  • Page 68: Rack Mounting

    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 1725 and another half-rack width instrument in a standard 19-inch rack. The rack adapter is adjustable, so the 1725 can be more closely aligned with other equipment in the rack.

  • Page 69: Figure 3-7: The 1700F05 Side-By-Side Rack Adapter

    If only one section of the rack adapter is used, a 1700F06 Blank Panel can be inserted in the unused section. See Figure 3–8. The rack adapter and panel are available through your local Tektronix field office or representative. 1700F05 1700F06 Figure 3–8: A 1700–Series instrument mounted in a 1700F05 cabinet with a blank...

  • Page 70: Custom Installation

    3 inches of rear clearance for BNC and power cord connections. To mount the 1725 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 71: Figure 3-10: Considerations For Custom Installation Of An Instrument

    For Protruding Front Molding: Cut hole in panel the same size as the opening in the monitor cabinet to al- low the front-panel molding to cover the hole. Figure 3–10: Considerations for custom installation of an instrument 1725 PAL/NTSC Vectorscope 3–10...

  • Page 72: Theory Of Operation

    Theory of Operation...

  • Page 74: Section 4 Theory Of Operation

    Overview The simplified block diagram shown in Figure 4–1 and the following paragraphs are intended to introduce the 1725 Vectorscope in the broadest of terms. A full scale discussion of operation follows this overview. The 1725 is a special purpose oscilloscope, designed to display the variations of phase in the NTSC or PAL color television signal.

  • Page 75: Block Diagram

    BLOCK DIAGRAM This description uses the 1725 Block Diagram, which is located at the beginning of the Diagram section (Section 9). The diagram can be folded out and viewed while reading this description.

  • Page 76: Microcontroller

    Nonvolatile Random Access Memory (NOVRAM), which makes it possible to return to the same front–panel condition should power be interrupted. If the 1725 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 77: Chrominance Processing

    Demodulators The 1725 employs quadrature demodulation, which consists of delaying the regenerated subcarrier by 90° to the R–Y (V) Demodulator. For PAL signals, an additional 180° phase shift is achieved by switching the regenerated subcarrier to the –input of the demodulator.

  • Page 78: Crt Blanking

    EXT REF VIDEO Video signal input to the 1725 Vectorscope is through high-impedance bridging loopthrough 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 79: Video Input Amplifiers

    NTSC and PAL subcarrier and sideband frequencies. The filter output drives an operational amplifier, Q82 and Q85 (Chroma Amplifier). Gain is approximately 16 to boost the chroma signal amplitude back up from the low signal level output by the filter. 1725 PAL/NTSC Vectorscope 4–6...

  • Page 80: Reference Switch

    The Sync Stripper receives its input through C186 and R443 into the base of Q83, a summing junction. Q83 and Q78 form an operational amplifier that inverts the sync signal and clips it near the sync tip. 1725 PAL/NTSC Vectorscope 4–7...

  • Page 81: Bowes Oscillator

    The –input of U12 is a voltage level set by a voltage divider R80-R95. The output goes low and stays there for NTSC and high and stays there for PAL. The output is limited to ±5 V by CR11 and CR12. 1725 PAL/NTSC Vectorscope 4–8...

  • Page 82: Figure 4-2: Block Diagram Of The Phase Locked Loop

    The Error Amp loop filter completes the loop by controlling the Subcarrier Oscillator. If the input reference changes, the oscillator will follow. 1725 PAL/NTSC Vectorscope 4–9...

  • Page 83: 45° Phase Flipper

    Carrier input signal is phase shifted by 90°. This results in the output of the Lock Detector being maximum when the output of the Loop Phase Detector is zero. Since Loop Phase Detector output is zero (phases are matched) during 1725 PAL/NTSC Vectorscope 4–10...

  • Page 84: Burst Detector

    When lockup occurs Q10 turns on and locks out PAL Phase Initializer and the Subcarrier Regenerator is locked to the correct phase. In addition, when U14 is locked out the U33B Preset line goes high, which allows it to be clocked by the H rate clock signal. 1725 PAL/NTSC Vectorscope 4–11...

  • Page 85: Vcxo

    The 4 x subcarrier output of the oscillator is input to a Johnson Counter, U7A and U7B, which divides its input frequency by 4 to yield a PAL or NTSC in phase and quadrature output. 1725 PAL/NTSC Vectorscope 4–12...

  • Page 86: Phase Shift

    The + and –15 V supplies generated on the Power Supply circuit board are further regulated to meet the onboard needs of the 1725 Main (A3) circuit board. U130 and U31 are the post regulators for the –11.8 V and +11.8 V supplies.

  • Page 87: Axis Switcher

    V Axis switching is enabled when the TEST function is selected from the front panel. V Axis switching displays the PAL signal with the –V lines overlaid on the +V lines. The resulting display appears as though only the +V signal is displayed, 1725 PAL/NTSC Vectorscope 4–14...

  • Page 88: Chrominance Demodulators

    The demodulated R–Y chrominance drives the negative input (pin 2), while a voltage, controlled by the Vector Vertical Position control (R258), is the reference level to the positive input (pin 3). 1725 PAL/NTSC Vectorscope 4–15...

  • Page 89: Vertical And Horizontal Standard Dot Generators

    XY INPUT connector. Output switching selects either the R–Y (V) and B–Y (U) or XY for amplification and display by the Horizontal and Vertical Deflec- tion Amplifiers. Driving signals for the Deflection Amplifiers are also input, as 1725 PAL/NTSC Vectorscope 4–16...

  • Page 90: Xy Input Amps

    C25 discharges in the positive direction toward ground. When the X or Y signal is away from 0 V, after sync time, U32C is closed and the output of at least one of the comparators will be be low (–6 V) and C25 recharges. 1725 PAL/NTSC Vectorscope 4–17...

  • Page 91: Crt Blanking

    See Figure 4–3. BLANK DODOT DOTUB DOTB DRAWING STANDARD DOT (COLOR SIGNAL PRESENT) CLAMP BLANK NOT TO SCALE STANDARD DOT NOT DRAWN (COLOR SIGNAL MISSING) CLAMP BLANK Figure 4–3: Dot timing signals for U6 1725 PAL/NTSC Vectorscope 4–18...
  • Page 92 1730–Series when it is a companion to the 1725. When Line Sel Blank is high, the crt is blanked and the line select bright-up circuitry is enabled. The line select blanking signal is low during the selected line to unblank the crt for that line.

  • Page 93: Microprocessor

    Microprocessor The 1725 is controlled by a Microprocessor and Erasable Programmable Read Only Memory (EPROM). U107 is an 8-bit Microcontroller that operates with U109 (32k X 8 EPROM) or contains its own masked ROM. Pins 32 through 39 of U107 (AD0-AD7) is a multiplexed address and data bus.

  • Page 94: Z Axis Control

    INTENSITY control using Q23 (in the FOCUS control circuit) as a current source. The blanking signal is input to the switch through pin 9. When pin 9 goes high the current output (pin 8) is shut off and the Z–Axis Amplifier (Diagram 10) blanks the crt. 1725 PAL/NTSC Vectorscope 4–21...

  • Page 95: Focus Control

    Trace Rotation Trace rotation is necessary to compensate for changes in the magnetic field surrounding the 1725. Q42 and Q44 are emitter followers that provide the Trace Rotation current to a coil located inside the crt shield, around the tube. Current amplitude and polarity are controlled by the front-panel ROTATE screwdriver adjustment.

  • Page 96: Line Rectifier And Filter

    R102 reduces the circulating current in the parallel circuit consisting of 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. 1725 PAL/NTSC Vectorscope 4–23...

  • Page 97: Pulse Width Modulator

    C58 increases the PWM noise immunity by rolling off the internal op-amp frequency response. R82 holds the switcher mosfet off as the circuit is powering up. R81 slows the turn-on of the switcher mosfet while CR27 speeds up the turn off. 1725 PAL/NTSC Vectorscope 4–24...

  • Page 98: Output Filters

    If the +5 V does not reach 4.9 V within 50 ms of power up, U3B will shutdown the switcher. The power supply will then cycle on and off every couple of seconds. Diagram 10 High Voltage Power Supply 1725 PAL/NTSC Vectorscope 4–25...

  • Page 99: Hv Osc And Error Amp

    The sine wave from the cathode of CR8 is coupled through R47 to a clipping circuit consisting of CR5 and CR6. Clipping level for the positive excursion of the sine wave is set by the CRT Bias adjustment, R58. The negative clipping 1725 PAL/NTSC Vectorscope 4–26...

  • Page 100: Z Axis Amplifier

    Filament (f) Cathode (k) GRID (g1) FOCUS (g3) ASTIG (g4) GEOM (g5) VERT PLATE (y2) VERT PLATE (y1) HORIZ PLATE (x2) 1st ANODE (g2) HORIZ PLATE (x1) Filament (f) Figure 4–4: Pinout of the CRT Socket 1725 PAL/NTSC Vectorscope 4–27...
  • Page 101 Theory of Operation 1725 PAL/NTSC Vectorscope 4–28...

  • Page 102: Section 5 Checks And Adjustments

    Checks and Adjustments...

  • Page 104: Recommended Equipment List

    For example: a TEKTRONIX 7603 Oscilloscope with a 7A13 Differential Comparator (needed for use with the TEKTRONIX Return Loss Bridge), and a 7B53A Dual Time Base. Also 10X probes, P6106 (Tektronix Part No. 010-6106-03). 2. Television Signal Generators (two standards required) Color test signals for the PAL and NTSC television standards: color bar signal, linearity staircase with variable APL, and black burst signal.
  • Page 105 TEKTRONIX Peak-to-Peak Detector (015-0408-00). 5. Audio Signal Generator, 10 Hz to 250 kHz For example: A TEKTRONIX SG505 Option 02 Oscillator installed in a TEKTRONIX TM500–Series Power Module. 6. Function Generator, –10 V pulse at 1 kHz (Needed only if Waveform Monitor is not available.)

  • Page 106: Auxilliary Equipment

    11. 75W Terminators (three required; two must be feed-through types) For example: End-line, 75W terminator (Tektronix Part No. 011-0102-00), and a feed through, 75W terminator (Tektronix Part No. 011-0103-02). 12. 75W Coaxial Cable (3 required) For example: 42 inch RG59U (Tektronix Part No. 012-0159-00).

  • Page 107: Performance Check

    40 IRE (300 mV PAL ) sync ±6 dB. d. CHECK – for stable display in both EXT and INT reference modes. CHECK – for a stable display in both EXT and INT reference modes. 1725 PAL/NTSC Vectorscope 5–4...
  • Page 108 1 second. Phase shift at these frequency offsets less than 0.5°. Phase shift with ±6 dB burst amplitude change less than 2°. c. CHECK – that the 1725 locks to the generator within 1 second at these frequencies.
  • Page 109 CHECK – that the 1725 locks to the generator within 1 second at these frequencies. k. CHECK – that the 1725 display does not change by more than ±0.5° at these frequencies. n. CHECK – that the 1725 burst vector phase does not change by more than ±2°...
  • Page 110 REQUIREMENT –– the –3 dB point at 200 kHz or greater in standard mode; 100 kHz or more in High Gain mode. d. CHECK – that the display reaches the –3 dB gaps in the horizontal axis or beyond. 1725 PAL/NTSC Vectorscope 5–7...

  • Page 111: Long Form Performance Check

    5 mV on the test oscilloscope vertical scale. Long Form Performance The following preparations should be made before starting the Performance Check Check. Set the 1725 as follows: Table 5–1: Preliminary Control Settings POWER INTENSITY Adjust as indicated in numbered s e s steps.

  • Page 112: Figure 5-2: Initial Equipment Connections For Performance Checks

    2. CHECK POWER SUPPLY OPERATION REQUIREMENT –– Check ac input range, 90 – 250 V. a. Turn on the 1725 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 operation, or 180 –...
  • Page 113 1410–SERIES (REAR VIEW) Figure 5–3: Equipment connections to check synchronization b. Push the 1725 VAR ON and adjust the VAR control to place the vector tip on the compass rose. c. Remove the 75W terminator from CH–B. d. CHECK – for stable display in both EXT and INT reference modes.
  • Page 114 Checks and Adjustments a. Set the 1725 MODE to VECTOR and REF to EXT. b. Connect the Leveled Sine wave Generator through the Precision 50W cable and 50W to 75W Minimum-Loss Attenuator to the CH–B INPUT. See Figure 5–4. 1410–SERIES...
  • Page 115 3.98 to 4.18 MHz . Repeat steps h. and i. for the horizontal graticule axis. k. Connect the PAL black burst signal to the 1725 EXT REF. Adjust the Sine wave Generator frequency to 4.43 MHz and adjust the Sine wave Generator amplitude so that the circle overlays the vector graticule circle.
  • Page 116 REQUIREMENT –– Vector Phase accuracy within ±1.25°. Vector Gain accuracy typically within ±1.25 IRE (NTSC) or ±2.5% (PAL). a. Set the 1725 REF to INT. b. Connect the PAL Color Bar signal to the CH–A INPUT and terminate the remaining side of the loop through connector with a 75W terminator.
  • Page 117 Checks and Adjustments d. Set the 1725 INPUT to CH–B. e. Set the NTSC television signal generator for 75% amplitude color bars. Adjust the PHASE control to place the vector dots in their graticule targets. g. CHECK – that all of the vectors fall within ±1.25° and ±1.25 IRE of the target centers.
  • Page 118 Turn off 1725 +V. b. Change the generator’s subcarrier frequency by ±10. c. CHECK – that the 1725 locks to the generator within 1 second at these frequencies. d. CHECK – that the Vectorscope display does not change by more than ±2°...
  • Page 119 Alternately display INPUT B with INT and EXT REF. h. CHECK – that there is less than 0.5° burst jitter with either INT or EXT REF. Disconnect the color bar signal from the dual input coupler. 1725 PAL/NTSC Vectorscope 5–16...
  • Page 120 8. CHECK AMPLIFIER LINEARITY REQUIREMENT –– Differential Phase: less than 1° for a 10 to 90% APL Linearity Staircase. Differential Gain: less than 1% for a 10 to 90% APL Linearity Staircase. a. Turn off VARIABLE GAIN. 1725 PAL/NTSC Vectorscope 5–17...
  • Page 121 Disconnect the Color Bar signal and terminator. 10. CHECK VARIABLE GAIN REQUIREMENT –– Input subcarrier signals between –6 dB and +14 dB (29.5 IRE and 147 IRE NTSC; 0.210 V and 1.05 V for PAL) can be adjusted to the burst amplitude. 1725 PAL/NTSC Vectorscope 5–18...
  • Page 122 Connect the NTSC generator 75% Color Bar signal to the CH A INPUT. Terminate remaining side of the loopthrough connector with a 75W termination. b. Use the 1725 VARIABLE GAIN and PHASE control to place the tip burst vector on intersection of the graticule 0° axis and the compass rose.
  • Page 123 Remove the PAL generator signal and 75W termination from the CH–A INPUT. 12. CHECK TRACE ROTATION RANGE REQUIREMENT –– Range greater than ±1° from horizontal. a. Connect the output of the Audio Signal Generator to pin 3 of the 1725 rear- panel XY INPUT connector. See Figure 5–9. –Y –X...
  • Page 124 REQUIREMENT –– the –3 dB point at 200 kHz or greater in standard mode; 100 kHz or more in High Gain mode. a. Connect the Leveled Sine wave Generator to pin 3 of the 1725 rear-panel XY INPUT connector. See Figure 5–9.
  • Page 125 CHECK – that the display reaches the –3 dB gaps in the horizontal axis or beyond. m. Connect the audio signal to pin 15 and ground pin 13 of the 1725 rear-panel XY INPUT connector. n. Set the Audio Signal Generator frequency to approximately 10 kHz and adjust its amplitude for a display equal to the height of the graticule compass rose.
  • Page 126 Unknown arm, set the 7A13 for 1 mV per division, and balance the Bridge. See Figure 5–11. Connect the Unknown arm to the INPUT (CH–A, CH–B, or EXT REF) of the 1725 instrument and connect the terminator to the opposite side of the loopthrough. See Figure 5–12.
  • Page 127 7A13 TERMINATOR Figure 5–12: Measuring return loss of 1725 CH–A input. c. CHECK – that the return loss of the CH–A, CH-B, and EXT REF INPUTs is better than 40 dB, from 50 kHz to 6 MHz. Make this check (within this frequency range) with the instrument power on and off.

  • Page 128: Adjustment Procedure

    Adjust R306 6. ADJUST LOCK-IN PHASE c. Adjust C31 g. Adjust C28 7. ADJUST CENTER DOT OVERLAY AND VECTOR POSITION d. Adjust R258 e. Adjust R244 8. ADJUST PHASE AND GAIN MATCH d. Adjust C209 1725 PAL/NTSC Vectorscope 5–25...
  • Page 129 15. ADJUST R–Y AND B–Y GAINS c. Adjust R277 d. Adjust R263 16. ADJUST NTSC 100% GAIN c. Adjust R371 17. ADJUST PAL GAIN c. Adjust R365 18. ADJUST CRT STANDARD INDICATOR b. Adjust R325 (Vertical) and R339 1725 PAL/NTSC Vectorscope 5–26...
  • Page 130 Checks and Adjustments 19. ADJUST AUTO LOCK IN RANGE e. Adjust R57 20. ADJUST LINE SELECT FOCUS With a 1730–Series Waveform Monitor: e. Adjust R200 Without a 1730–Series Waveform Monitor: e. Adjust R200 1725 PAL/NTSC Vectorscope 5–27...

  • Page 131: Long Form Adjustment Procedure

    É É É É É É É É É É É É É É É É É Figure 5–13: Adjustment and test point locations for the 1725 Vectorscope SIGNAL CONNECTIONS. Connect the PAL black burst signal to the 1725 EXT REF INPUT and terminate with a 75W termination. Connect the PAL color bar signal to the 1725 CH–A INPUT and terminate with a 75W termination.

  • Page 132: Table 5-2: Preliminary Control Settings

    Figure 5–14: Initial equipment connections for the adjustment procedure Connect the Audio Signal Generator to the 1725 XY INPUT. See Figure 5–1 for a diagram of how to hook up the 15-pin D-type connector to calibrate the 1725 Vectorscope. Set the Audio Signal Generator frequency to 50 kHz.
  • Page 133 ADJUST R11 (CTR FOCUS) and R49 (ASTIG) for a clearly-defined vector display. 4. ADJUST TRACE ROTATION a. Switch the 1725 MODE to XY. b. Connect the Audio Signal Generator output to the X INPUT. See Figure 5–15. c. Adjust the Audio Generator amplitude for a line equal to the compass rose.
  • Page 134 ADJUST R306 (+11.8 V ADJ) for +11.78 to +11.82 volts. 6. ADJUST LOCK-IN PHASE a. Set the 1725 INPUT to CH–A, MODE to VECTOR, and REF to INT. b. Connect the voltmeter ground lead to one of the rear-panel ground lugs, and the active lead to TP1 (test point).
  • Page 135 7. ADJUST CENTER DOT OVERLAY AND VECTOR POSITION a. Disconnect the Television Signal Generator output from the CH–B INPUT. b. Adjust the 1725 front-panel horizontal and vertical position controls to center the dot at the graticule center mark. c. Change the 1725 MODE to BOTH.
  • Page 136 10. ADJUST X AND Y GAINS a. Set the Audio Generator to the desired output voltage between 2 V and 9 V (the 1725 is shipped at 2.4 V). b. ADJUST R207 (Y Gain) for a Y axis display equal to the vertical distance between the centers of the dB boxes.
  • Page 137 Ground the test oscilloscope input and position the trace to graticule center. e. ADJUST R161 (DC Loop Balance) to return the test oscilloscope trace to graticule center. Position one of the PAL burst vectors on the horizontal axis. 1725 PAL/NTSC Vectorscope 5–34...
  • Page 138 Checks and Adjustments g. Turn ON the 1725 VAR. h. Rotate the VAR until the burst vector is 1/2 normal and then 1 1/2 times normal; check that the burst vector remains within 2 of the horizontal axis. If vector moves more than 2 repeat steps d.
  • Page 139 16. ADJUST NTSC 100% GAIN a. Select 100% Amplitude Color Bars from the PAL Television Test Signal Generator. b. Push the 1725 100% BARS button. c. ADJUST R371 (100% Gain) the red and cyan (R and CY) vector tips directly on their targets.
  • Page 140 Set the VARIABLE GAIN to place the burst vector tip on the compass rose. See Figure 5–18. h. Press 1725 AUTO PHASE button and check that the burst tip is within ±2° of the horizontal axis. Turn off 1725 VARIABLE GAIN and display the NTSC 75% color bar signal.
  • Page 141 ADJUST R200 (LS Focus) for the best 1725 display. Without a 1730–Series Waveform Monitor: Connect the output of the Function Generator to pin 7 of the 1725 rear- panel AUXILIARY connector. g. Set the Function Generator for a narrow, negative-going, 10 V, 1 kHz pulse.

  • Page 142: Section 6 Maintenance

    Maintenance...

  • Page 144: 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 1725 PAL/NTSC Vectorscope 6–1...

  • Page 145: Visual Inspection

    Table 6–1: Static Susceptibility Relative Susceptibility Levels Voltage CMOS 100V – 500V 200V – 500V 250 V SCHOTTKY SIGNAL DIODES 500 V SCHOTTKY TTL 400 to 600 V HF BIPOLAR TRAN- SISTORS 600 to 800 V JFETS 1725 PAL/NTSC Vectorscope 6–2...

  • Page 146: 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. 1725 PAL/NTSC Vectorscope 6–3...

  • Page 147: 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. 1725 PAL/NTSC Vectorscope 6–4...

  • Page 148: Parts Lists

    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 1725 PAL/NTSC Vectorscope 6–5...

  • Page 149: General Troubleshooting Techniques

    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. ROW B...
  • Page 150 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 151: 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 1725 power supply without reading these instructions. Troubleshooting Procedure NOTE.

  • Page 152: Introduction

    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 1725 PAL/NTSC Vectorscope 6–9...
  • Page 153 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). 1725 PAL/NTSC Vectorscope 6–10...

  • Page 154: Table 6-4: Control Circuit Test Points

    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). 1725 PAL/NTSC Vectorscope 6–11...

  • Page 155: 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. 1725 PAL/NTSC Vectorscope 6–12...

  • Page 156: 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 1725 PAL/NTSC Vectorscope 6–13...

  • Page 157: Serial Port And Led Driver Diagnostics

    CR4. Serial Port and LED Driver A non-destructive diagnostic program is built into the 1725. All that is required Diagnostics to perform these diagnostics is a male, 9-pin, sub-miniature D-type connector with pins 8 and 9 connected together.

  • Page 158: Corrective Maintenance

    Maintenance 5. Turn off POWER. This ends the Diagnostic Procedure. When the 1725 is powered up again it will be operating in the normal vectorscope configura- tion. Corrective Maintenance NOTE. Solder: A 2% RMA flux content solder is recommended for making repairs in this instrument.

  • Page 159: 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 160: 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 161: Crt Removal

    WARNING. The CRT may retain a dangerous charge. Ground the the anode connector to discharge the CRT. Do not allow the conductor to touch your body or any circuitry. 3. Use a screwdriver to ground the CRT anode connector to the chassis. 1725 PAL/NTSC Vectorscope 6–18...

  • Page 162: Removing The Rear Panel

    TO AVOID ELECTRICAL SHOCK, THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR MUST BE CONNECTED TO EARTH GROUND. INPUT CH-B EXT REF CH-A 75 OHM LOOP-THROUGH Figure 6–4: Screws that need to be removed to remove the rear panel 1725 PAL/NTSC Vectorscope 6–19...
  • Page 163 5. To re-assemble, reverse the procedure. To remove front panel assembly To separate board from the front panel To remove front panel assembly Figure 6–5: Screws that hold the Front Panel circuit board (A2) in place. 1725 PAL/NTSC Vectorscope 6–20...

  • Page 164: Removing The Main Board

    Removing the Power Supply Board 1. Remove the plug from J546 on the Power Supply board; it is the connection to the Main board. 2. Remove the anode connection from the crt and discharge it to ground. 1725 PAL/NTSC Vectorscope 6–21...
  • Page 165 1. Disconnect the two ribbon cables from P101 and P102. 2. Remove the two screws securing the circuit board to the chassis. See Fig. 6–8. 3. To replace the Control board, reverse steps 1 and 2. 1725 PAL/NTSC Vectorscope 6–22...

  • Page 166: 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 167 Maintenance Figure 6–9: Repackaging 1725 PAL/NTSC Vectorscope 6–24...

  • Page 168: Section 7 Options

    Options...

  • Page 170: Cabinets

    However, there are customer-installable Field Upgrade Kits that can be ordered. Cabinets All of the Safety and EMI tests used to qualify the 1725 were performed in a cabinet. There are two optional cabinets and a dual rack adapter available for the installation of these instruments.
  • Page 171 Options 1725 PAL/NTSC Vectorscope 7–2...

  • Page 172: Replaceable Electrical Parts

    Replaceable Electrical Parts...

  • Page 174: Section 8 Replaceable Electrical Parts

    Replaceable Electrical Parts This section contains a list of the components that are replaceable for the 1725. 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 175: Column Descriptions

    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 176: Cross Index-Mfr. Code Number To Manufacturer

    Replaceable Electrical Parts Cross Index – Mfr. Code Number To Manufacturer Mfr. Code. Manufacturer Address City, State, Zip Code TK0196 ALMAC–STROUM ELECTRONICS (DIST) 9500 SW NIMBUS AVE BEAVERTON, OR 97005 BUILDING E TK0435 LEWIS SCREW CO 4300 S RACINE AVE CHICAGO IL 60609–3320 TK0515 EVOX–RIFA INC...
  • Page 177 Replaceable Electrical Parts Mfr. Code. Manufacturer Address City, State, Zip Code 11502 IRC, INC BOONE NC 28607–1860 PO BOX 1860 12697 CLAROSTAT MFG CO INC 12055 ROJAS DRIVE EL PASO, TX 79936 SUITE K 12969 MICROSEMI CORPORATION 530 PLEASANT STREET WATERTOWN MA 02172 WATERTOWN DIVISION 13103...
  • Page 178 JW MILLER DIV PO BOX 2859 8X345 NORTHWEST SPRING MFG CO 5858 WILLOW LANE LAKE OSWEGO, OR 97035 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 179 Replaceable Electrical Parts Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Code Number Name & Description 671–2890–11 B041517 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289011 671–2890–12 B041518 CIRCUIT BD ASSY:POWER SUPPLY 80009 671289012 671–1999–01...
  • Page 180 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A1C35 290–1267–00 CAP,FXD,ALUM:560UF,20%,50V,ESR=0.40 OHM 0H1N5 CEEFM1H561M7 (100KHZ,20C) A1C36 290–1267–00 CAP,FXD,ALUM:560UF,20%,50V,ESR=0.40 OHM 0H1N5 CEEFM1H561M7 (100KHZ,20C) A1C37 290–1267–00 CAP,FXD,ALUM:560UF,20%,50V,ESR=0.40 OHM...
  • Page 181 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A1CR29 152–0400–00 DIODE,RECT:FAST RCVRY;400V,1A,200NS 0LUA3 1N4936 A1CR30 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A1CR31 152–0400–00 DIODE,RECT:FAST RCVRY;400V,1A,200NS 0LUA3 1N4936 A1DS1 150–0050–00...
  • Page 182 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A1R22 322–3329–00 RES,FXD,FILM:26.1K OHM.1%,0.2W,TC=T0M 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...
  • Page 183 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A1R81 322–3121–00 RES,FXD:METAL FILM;178 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G178R0F A1R82 322–3260–00 RES,FXD,FILM:4.99K OHM,1%,0.2W,TC=T0 91637 CCF501G49900F A1R83 322–3289–07 RES,FXD,FILM:10K OHM,0.1%,0.2W,TC=T9,T&R...
  • Page 184 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A2DS249 ––––––––––– (PART OF A2DS247) A2DS323 150–1282–00 DIODE,OPTO:LED;ASSEMBLY,GRN,150–1109–00 IN TK1155 150–1282–00 A2DS521 150–1289–00 LED ASSEMBLY:DIRECTIONAL;2 IN 3 GREEN TK1155 150–1289–00...
  • Page 185 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number 366–0616–00 PUSH BUTTON:0.585 X 0.3 X 0.150 7X318 ORDER BY DESC *END ATTACHED PARTS* A2S308 260–2300–00 SWITCH,SIG:SPST;PUSH,MOM,NO,W/GND TERM,MNL...
  • Page 186 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3C35 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C36 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C37 281–0765–00 CAP,FXD,CER DI:100PF,5%,100V 04222 SA102A101JAA A3C38 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170...
  • Page 187 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3C95 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C96 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C97 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A3C98 281–0826–00 CAP,FXD,CERAMIC:MLC;2200PF,10%,100V...
  • Page 188 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3C153 281–0810–00 CAP,FXD,CERAMIC:MLC;5.6PF,+/–0.5PF,100V,0.100 X 0.170 04222 SA102A5R6DAA A3C154 281–0819–00 CAP,FXD,CERAMIC:MLC;33 PF,5%,50V,0.100 X 0.170 04222 SA102A330JAA A3C155 281–0775–01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170...
  • Page 189 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3C211 290–0848–00 CAP,FXD,ALUM:47UF,20%,16V,ESR=7.05 OHM(120HZ,25C) 0H1N5 CEBPM1E470M A3C212 281–0960–00 CAP,FXD,CERAMIC:MLC;10PF,+/–.25PF,200V,NPO,.170X.100 04222 SA102A100CAA A3C213 283–0175–00 672–1342–09 CAP,FXD,CER DI:10PF,5%,200V SQUARE 04222...
  • Page 190 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3J17 131–4530–00 CONN,HDR:PCB;MALE,STR,1 X 3,0.1 CTR,0.230MLG X 00779 104344–1 0.120 TAIL,30GOLD,BD RETENTION A3JS1 131–4794–00 CONN,HDR:PCB;MALE,STR,1 X 2,0.1 CTR,0.235MLG X 0.112 53387 2402–6112 UB...
  • Page 191 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3Q14 151–1005–00 XSTR,SIG:JFET,N–CH;5V,6MA,2MS,500 OHM 21845 F2233 A3Q15 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPLIFIER 0JR04 2N3904 A3Q16 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPLIFIER 0JR04 2N3904 A3Q17 151–0188–00 XSTR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMPLIFIER...
  • Page 192 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3Q76 151–0347–00 XSTR,SIG:BIPOLAR,NPN;160V,600MA,100MHZ,AMPLIFIER 0JR04 2N5551 A3Q77 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPLIFIER 0JR04 2N3904 A3Q78 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPLIFIER 0JR04 2N3904 A3Q79 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPLIFIER...
  • Page 193 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R34 322–3354–00 RES,FXD:METAL FILM;47.5K OHM,1%,0.2W,TC=100 91637 CCF501G47501F A3R35 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R36 322–3172–00 RES,FXD,FILM:604 OHM,1%,0.2W,TC=T0MI,SMALL BODY...
  • Page 194 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R95 322–3218–00 RES,FXD:METAL FILM;1.82K OHM,1%,0.2W,TC=100 91637 CCF501G18200F A3R96 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A3R97 322–3197–00 RES,FXD,FILM:1.1K OHM,1%,0.2W,TC=T0MI,SMALL...
  • Page 195 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R154 322–3222–00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F A3R155 322–3222–00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F A3R156 322–3222–00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM...
  • Page 196 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R212 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R213 322–3169–00 RES,FXD:METAL FILM;562 OHM,1%,0.2W,TC=100 PPM 91637 CCF50–2F562R0F A3R214 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM...
  • Page 197 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R271 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G100R0F A3R272 311–2230–00 RES,VAR,TRMR:CERMET;500 OHM,20%,0.5W,0.197SQ TK2073 GF06UT2 501 M L A3R273 322–3281–00...
  • Page 198 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R329 322–3318–00 RES,FXD,FILM:MET FILM;20K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20001F A3R330 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R331 322–3197–00 RES,FXD,FILM:1.1K OHM,1%,0.2W,TC=T0MI,SMALL...
  • Page 199 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R387 311–2236–00 RES,VAR,TRMR:CERMET;20K OHM,20%,0.5W,0.197SQ TK2073 GF06UT2 203 M L A3R388 322–3322–00 RES,FXD:METAL FILM;22.1K OHM,1%,0.2W,TC=100 91637 CCF501G22101F A3R389 322–3193–00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM...
  • Page 200 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A3R445 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A3R446 322–3250–00 RES,FXD:METAL FILM;3.92K OHM,1%,0.2W,TC=100 91637 CCF50–2F39200F A3R447 322–3097–00 RES,FXD:METAL FILM;100 OHM,1%,0.2W,TC=100 PPM...
  • Page 201 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number 136–0752–00 SOCKET,DIP:PCB;FEMALE,STR,2 X 10,0.3 CTR,0.210 H X 00779 2–641602–3 0.128 TAIL,TIN,PHOS BRONZE *END MOUNTING PARTS* A3U7 156–0230–02 IC,DIGITAL:ECL,FLIP FLOP;DUAL D–TYPE MASTER...
  • Page 202 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number *MOUNTING PARTS* 136–1119–01 SOCKET,LPHLDR:PCB,LAMPHOLDER;FEM,STR,SGL,0.404 65654 CIC 7500 A–VALO H X 0.218 TAIL,TIN,T–1.75 WEDGE BASE *END MOUNTING PARTS* A3A1DS200 150–0168–00...
  • Page 203 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number A4R114 322–3001–00 RES,FXD:METAL FILM;10 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10R00F A4R115 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A4R116 322–3289–00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM...
  • Page 204 Replaceable Electrical Parts Component Tektronix Serial / Assembly Number Mfr. Mfr. Part Number Part Number Effective Discontinued Name & Description Code Number 174–3511–01 CA ASSY,SP:DESCRETE;CPD,4,26 AWG,8.0L,1X7,0.1CTR, 9M860 174–3511–00 RCPT X STRAIN RELIEF,PCB *ATTACHED PARTS* 344–0111–00 INSUL,SPREADER:DEFL LEADS,POLYPROPYLENE TK1617 343–0298–00 STRAP,RETAINING, 0.25 CABLE 85480 A1C25–A–C8...
  • Page 205 Replaceable Electrical Parts 8–32 1725PAL/NTSC Vectorscope...

  • Page 206: Diagrams/Circuit Board Illustrations

    Diagrams/Circuit Board Illustrations...

  • Page 208: Section 9 Diagrams/Circuit Board Illustrations

    Abbreviations are based on ANSI Y1.1–1972. have no Assembly No. prefix. A23 A2 R1234 See end of Replaceable Electrical Parts List Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Subassembly Assembly Number (if used) Schematic Circuit...
  • Page 209 Waveforms appearing with the schematic diagrams were taken with a color bar signal input to Channel A input and with the front panel setup shown in Table 9-1, unless otherwise noted. Source of the siganls used for these waveform photos is a TEKTRONIX 1411-Series Television Signal Generator.
  • Page 210 LOW PASS SLOW mP BLANK PAL PHASE SIGNAL LINE FILTER LOCK FLIPPER LOCK INTENSITY FOCUS DETECTOR CONTROL LINE CONTROL BLANKING CONTROL LINE SCHEMATIC SELECT DIAGRAM NUMBER FRONT PANEL SCREWDRIVER ADJ. 1725 PAL / NTSC VECTORSCOPE INTENS FOCUS FRONT PANEL KNOB...
  • Page 211 R108 R251 R323 C141 R109 R180 R252 R324 C142 R181 R253 R110 R182 R254 R325 C143 R111 R183 R326 C144 R112 R184 R255 R327 C145 R113 R256 R328 C146 R114 R185 R257 R329 C147 R186 R258 CR11 1725 PAL/NTSC Vectorscope...
  • Page 212 A3 Main Board Static Sensitive Devices See Maintenance Section A3 Main Board Component Locator (with cross references to schematic diagrams 1, 2, 3, 4, 5, 6, and 8). Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag...
  • Page 213 CR44 R398 CR45 R408 R410 U32A R417 U32B R418 U35A R419 U35B R420 U35C R429 U35D R430 R431 U39A R432 U39B R433 U39C R434 U39D R435 U41A R436 U41B R439 U41C U41D R440 R441 R442 R446 R447 1725 PAL/NTSC Vectorscope...
  • Page 214 22PF C207 -11.8V 2.2PF R483 R429 3.01K 1.82K SYNC TIP REAR R457 R370 R419 PANEL -11.8V 15.0K CHROMINANCE 1.82K 10.0K -11.8V CLAMP R455 R432 2.21K 49.9K -11.8V -11.8V PART OF A3 MAIN BOARD 1725 DUAL STANDARD VECTORSCOPE INPUT AMPLIFIER <1>...
  • Page 215 C197 R452 C202 R453 CR11 R454 CR12 R469 CR33 R470 CR37 R474 CR40 R475 CR41 R482 CR42 R486 CR43 R487 R106 R388 U37A U37B R389 U37D R391 R401 U40A R402 U43A R403 U43D R404 R405 R406 R409 1725 PAL/NTSC Vectorscope...
  • Page 216 Q100 6.81K 100K .1UF R452 R454 REF_VIDEO 6.19K 2.00K 1.10K R486 1.82K .1UF 1.00K 4.99K -5.4V -11.8V <3> REF_VIDEO -11.8V -5.4V -11.8V 4.99K BURST_GATE 6.81K .1UF -5.4V 8.25K -11.8V PART OF A3 MAIN BOARD 1725 DUAL STANDARD VECTORSCOPE SYNC <2>...
  • Page 217 R252 C116 R127 R253 C123 R128 R375 C162 R129 R399 CR13 R131 CR17 R132 CR18 R134 CR19 R135 U13A CR22 R145 U13D CR36 U14A R146 U14B R147 R148 R149 R150 R151 U33B R152 U36B R161 R162 R163 1725 PAL/NTSC Vectorscope...
  • Page 218 82UH R186 .1UF <8> 16.8PF R226 22.1K /SLOW R187 214PF 4.99K R129 R120 180PF -11.8V +5.1V 2.00K 4.7M C110 <2> R215 .001UF C105 .1UF REF_VIDEO R217 4.99K -11.8V PART OF A3 MAIN BOARD 1725 DUAL STANDARD VECTORSCOPE SUBCARRIER REGENERATOR <3>...
  • Page 219 CR32 R101 R102 R103 R107 R108 R109 R110 R118 R119 R255 R256 R272 R282 R298 R306 R309 R315 R322 R323 C117 C126 U10A C127 U10B U10C C131 C139 U10D C141 C149 C160 C163 C164 C165 C167 C186 1725 PAL/NTSC Vectorscope...
  • Page 220 10UF .1UF .1UF .1UF 10UF 10UF .1UF CR26 -15V SYNC_TIP -15V -11.8V R107 CR27 49.9K C167 R282 .1UF 10UF 10UF -15V -11.8V -11.8V -11.8V PART OF A3 MAIN BOARD 1725 DUAL STANDARD VECTORSCOPE VCXO, PHASE SHIFTER, & AUTO ZERO <4>...
  • Page 221 CR25 R283 R352 CR28 R353 CR29 R284 R354 CR30 R285 R286 R355 R287 R356 R288 R357 R358 R289 R359 R290 R291 R360 R292 R361 R293 R363 R294 R295 R296 R299 R300 R301 R302 U36A R303 R304 R305 1725 PAL/NTSC Vectorscope...
  • Page 222 11.0K 20.0K HORIZ STANDARD C122 POSITION R245 <6> R304 .01UF HORIZ 4.99K C133 C134 -11.8V .1UF .1UF CR29 +11.8V HORIZ STANDARD C125 -11.8V .1UF DOT GENERATOR R330 CR25 10.0K PART OF A3 MAIN BOARD 1725 DUAL STANDARD VECTORSCOPE DEMODULATOR <5>...
  • Page 223 R202 U22C R203 R204 U22D U24A R206 U24B R207 U24C R208 U24D R209 R221 U32C U40B R222 U42A R223 U42B R224 U42C R225 U42D R251 A11 Serial Filter Board R254 R269 Static Sensitive Devices See Maintenance Section 1725 PAL/NTSC Vectorscope...
  • Page 224 X HIGH GAIN R251 NOT INSTALLED NORMAL INSTALLED X10 GAIN 470PF 470PF R270 NOTE: SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES. -11.8V A11 SERIAL FILTER BOARD PART OF A3 MAIN BOARD -11.8V 1725 DUAL STANDARD VECTORSCOPE DEFLECTION AMPLIFIER <6>...
  • Page 225 R107 U110 C124 R108 U111 R113 U113 CR100 R114 U114A CR101 R115 U114B J100 R116 U114C R117 U114D P100 U101 P101 U102 W100 P102 W101 U103 W102 R100 U104 Y100 R101 U106 R102 U107 R103 U108 R104 1725 PAL/NTSC Vectorscope...
  • Page 226 LED_PAL PART DGND LED_CHA LED_CHA LED_VAR 8031 LED_NTSC LED_CHB 74LS377 LED_VAR LED_CAL 74LS125 LED_+V LED_INTREF C110 C113 C114 C124 .1UF .1UF .1UF .1UF HCTL2000 LED_CHB LED_VECT 27C256 LED_75% LED_CAL LED_VECT LED_INTREF A4 CONTROL BOARD 1725 DUAL STANDARD VECTORSCOPE MICROCONTROLLER <7>...
  • Page 227 S142 A2 Front Panel Board S222 R130 A3A1 S243 R133 Static Sensitive Devices R136 R137 S308 See Maintenance Section DS100 S317 DS200 S518 R138 DS300 R139 R140 P100 R141 P200 R142 P800 R143 R144 R157 R158 R159 1725 PAL/NTSC Vectorscope...
  • Page 228 ON CRT LED_75% <1> /75% ROTATE LED_100% R238 <10> 74HC04 74HC04 LED_NTSC -11.8V <1> /100% NOT INSTALLED C113 .1UF -15V 74HC04 DS522B DS247B PART OF A3 MAIN BOARD A2 FRONT PANEL BOARD 1725 DUAL STANDARD VECTORSCOPE FOCUS/Z–AXIS & FRONT PANEL <8>...
  • Page 229 The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. R101 R102 Assembly A1. Partial Assembly A1 also shown on Diagram 10. CR10 CR11 CR12 CR13 CR14 CR15 CR16 CR17 CR18 CR19 CR20 CR21 CR22 CR23 CR24 CR25 CR26 CR27 1725 PAL/NTSC Vectorscope...
  • Page 230 10.0 +5VC 3.74K .01UF CR16 10.00K SECONDARY GROUND 18.7K PEAK LINE SIDE COMMON (CHASSIS GROUND) DETECTOR See parts list for earier values and serial number ranges PART OF A1 POWER SUPPLY 1725 DUAL STANDARD VECTORSCOPE LOW VOLTS POWER SUPPLY <9>...
  • Page 231 CR13 CR14 CR15 CR16 CR17 CR18 CR19 CR20 CR21 CR22 CR23 CR24 CR25 CR26 CR27 CR28 CR29 CR30 CR31 A10 CRT Socket Board (Back of Board) Comp Diag Diag Comp Diag Diag FIL1 FIL2 R101 R102 R103 1725 PAL/NTSC Vectorscope...
  • Page 232 NOT INSTALLED (x1) HORIZ PLATE 499K 499K (g2) 1st ANODE HORIZ PLATE (x2) <9> FOCUS NOTE: SEE PARTS LIST FOR EARLIER VALUES PART OF A1 POWER SUPPLY AND SERIAL NUMBER RANGES 1725 DUAL STANDARD VECTORSCOPE HIGH VOLTS POWER SUPPLY <10>...

  • Page 234: Replaceable Mechanical Parts

    Replaceable Mechanical Parts...

  • Page 236: Section 10 Replaceable Mechanical Parts

    Replaceable Mechanical Parts This section contains a list of the components that are replaceable for the 1725. 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 237: Column Descriptions

    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 238: Cross Index-Mfr. Code Number To Manufacturer

    DIV OF COOPER INDUSTRIES INC PO BOX 14460 73743 FISCHER SPECIAL MFG CO 111 INDUSTRIAL RD COLD SPRING KY 41076–9749 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 239 *END MOUNTING PARTS* –3 333–3306–00 PANEL,FRONT: 80009 333330600 –4 378–0258–00 FLTR,CONTRASTIN:GRAY,POLYCARBONATE 80009 378025800 –5 333–3923–01 PANEL,FRONT:1725 80009 333392301 *MOUNTING PARTS* –6 211–0721–00 SCREW,MACH:6–32 X 0.375,PNH,STL,CDPL,T–15 TORX DR 0KB01 ORDER BY DESC *END MOUNTING PARTS* –7 ––––––––––– CIRCUIT BD ASSY:FRONT PANEL...
  • Page 240 –57 129–1308–00 B041413 SPACER,POST:6–32X0.75 HEX,STL,CAD PL 0570 4538-632-s-3 STANDARD ACCESSORIES –51 012–1422–01 CA ASSY,SP,ELEC:MLD,1720 TK1547 012–1422–01 070–7635–02 MANUAL,TECH:INSTRUCTION,1725 DUAL STANDARD 80009 070763502 150–0168–00 LAMP,INCAND:14V,0.08A,WEDGE BASE,T1.75 FOR SKT MT 55335 159–0021–00 FUSE,CARTRIDGE:3AG,2A,250V,FAST BLOW 71400 AGC–2 –52 161–0216–00 CABLE ASSY,PWR,:3,18 AWG,2.5M L,BLACK 80126 C7120–25M–BL...
  • Page 241 Replaceable Mechanical Parts Fig. & Tektronix Serial Number Mfr. Index Part No. Effective Dscont Name & Description Code Mfr. Part No. –55 161–0066–11 CA ASSY,PWR:3,1.0MM SQ,250V/10A,2.5 METER,STR, S3109 198–000 IEC320,RCPT,AUSTRALIA,SAFTEY CONTROLLED (AUSTRALIAN OPTION A3 ONLY) –56 161–0212–00 CABLE ASSY,PWR,:3,1.0MM SQ,220V,2.5 METERS...
  • Page 242 A3A1...

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