Page 3 - Service Assurance; Service Assurance Advantages
Service Assurance If you have not already purchased Service Assurance for this product, you may do so at any time during the product’swarranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs. Repair Protection extends priority repair services beyond t...
Page 5 - WARRANTY
WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanshipfor a period of three (3) years from the date of shipment. If a product proves defective during this warranty period,Tektronix, at its option, either will repair the def...
Page 7 - 780R-Series Service Manual; Table of Contents; Specifications
1780R-Series Service Manual i Table of Contents General Safety Summary xi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xiii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xv . . . . . . . . . . . . . . . . . . . . ....
Page 8 - ii; Operating Information; Theory of Operation
Table of Contents ii 1780R-Series Service Manual Operating Information 2–27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front-panel Controls 2–28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Measurement Control...
Page 9 - iii; Adjustment Procedures; Preventive Maintenance
Table of Contents 1780R-Series Service Manual iii Adjustment Procedures General Information 5–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Equipment List 5–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adj...
Page 10 - iv; Options
Table of Contents iv 1780R-Series Service Manual Options CRT Options 7–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Cord Options 7–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Elec...
Page 11 - List of Figures
Table of Contents 1780R-Series Service Manual v List of Figures Figure 1–1: Simplified representation of the 1780R-Series Video Measurement Set 1–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2–1: Rear panel for the Tektronix 1780R-Series Measurement Set 2–3 . . . . . ...
Page 13 - vii
Table of Contents 1780R-Series Service Manual vii Figure 5–11: Adjustment locations on the Vectorscope circuit board (Assembly A6) 5–21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5–12: Connections for adjusting the calibrator amplitude 5–22 . . . Figur...
Page 14 - viii; List of Tables
Table of Contents viii 1780R-Series Service Manual List of Tables Table 1–1: Input/Output 1–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1–2: Waveform Monitor Vertical System 1–5 . . . . . . . . . . . . . . . . . Table 1–3: Waveform Monitor Probe Input 1–8 . . . . ...
Page 15 - ix
Table of Contents 1780R-Series Service Manual ix Table 5–1: Recommended Equipment 5–4 . . . . . . . . . . . . . . . . . . . . . . . . . Table 5–2: 1780R-Series Adjustments for Calibration Procedure 5–8 . . Table 5–3: 1780R-Series Initial Control Settings 5–12 . . . . . . . . . . . . . . . . . Table ...
Page 17 - General Safety Summary; Only qualified personnel should perform service procedures.; To Avoid Fire or
1780R-Series Service Manual xi General Safety Summary Review the following safety precautions to avoid injury and prevent damage tothis product or any products connected to it. To avoid potential hazards, use thisproduct only as specified. Only qualified personnel should perform service procedures. ...
Page 18 - in injury or loss of life.; Terms on the Product.; Symbols and Terms
General Safety Summary xii 1780R-Series Service Manual Terms in this Manual. These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result...
Page 19 - xiii; Service Safety Summary; Do Not Service Alone.
1780R-Series Service Manual xiii Service Safety Summary Only qualified personnel should perform service procedures. Read this ServiceSafety Summary and the General Safety Summary before performing any serviceprocedures. Do Not Service Alone. Do not perform internal service or adjustments of this pro...
Page 20 - xiv
Service Safety Summary xiv 1780R-Series Service Manual
Page 21 - xv; Preface
1780R-Series Service Manual xv Preface This Service Manual is part of a 2-volume set. Its companion manual is theOperator’s Manual, which is aimed primarily at operating personnel. Informationin this volume is intended for those who are required to maintain the 1780R-Se-ries Video Measurement Set. S...
Page 22 - xvi
Page 24 - Product Description; Signal and reference input is through 75
1780R-Series Service Manual 1–1 Product Description The Tektronix 1780R-Series Video Measurement Set is a 19-inch wide,5 1/4-inch high, 18-inch deep dual-CRT Waveform Monitor/Vectorscope. Itweighs approximately 28 pounds and is intended for rack-mount applications,but can also be configured as a ful...
Page 26 - Performance Qualification; C. The rated accuracies are valid; Heat Dissipation
1780R-Series Service Manual 1–3 Specifications This section of the manual contains the specifications for the 1780R-Series.Tabular information is divided into two categories. First there are the Perfor-mance Requirements which is assured by Tektronix Inc. Second are the items inthe Supplemental Info...
Page 27 - Characteristic
Specifications 1–4 1780R-Series Service Manual Table 1–1: Input/Output Characteristic Performance Requirement Supplemental Information PerformanceCheck Step Vertical Ranges Volts Full Scale Accuracy 1.0 1.0 V ± 0.007 V. Peak-to-peak Amplitude for FullGraticule 1.0 volt/140 IRE. 4 Var ≤ 0.5:1 to ≥ 1....
Page 28 - Table 1–2: Waveform Monitor Vertical System
Specifications 1780R-Series Service Manual 1–5 Table 1–2: Waveform Monitor Vertical System Characteristic Performance Requirement Supplemental Information PerformanceCheck Step Return Loss CH A, B1 , B2, or B3 >40 dB DC to 5 MHz. (Terminated in 75 W .) 58 Aux Video In, Aux Video Out, & PixMon...
Page 31 - Table 1–3: Waveform Monitor Probe Input
Specifications 1–8 1780R-Series Service Manual Table 1–3: Waveform Monitor Probe Input Characteristic Performance Requirement Supplemental Information PerformanceCheck Step Input Resistance 1 M W . Input RC Product 20 m s (20 pF). Gain Unity ± 3%. With gain adjusted for equivalent1 V peak-to-peak di...
Page 34 - Table 1–5: Waveform Monitor dG and dP Display
Specifications 1780R-Series Service Manual 1–11 Table 1–5: Waveform Monitor dG and dP Display Characteristic Performance Requirement Supplemental Information PerformanceCheck Step Differential Gain Deflection Factor 5% dG deflects the trace 50 IRE(NTSC) or 500 mV (PAL) ± 5%. Waveform gain X1, Var. G...
Page 35 - Table 1–6: Synchronization
Specifications 1–12 1780R-Series Service Manual Table 1–6: Synchronization Characteristic Performance Requirement Supplemental Information PerformanceCheck Step Sync Input Internal Ref. Sync Separator 0.2 to 2.0 V peak-to-peak com-posite video. Composite video applied to InputsA, B1, B2, or B3 or pr...
Page 36 - Table 1–7: Vectorscope Vector Display
Specifications 1780R-Series Service Manual 1–13 Table 1–6: Synchronization (Cont.) Characteristic PerformanceCheck Step Supplemental Information Performance Requirement Jitter from missing line sync pulses <15 ns per missing sync pulse.Maximum of 10 consecutive linesync pulses. Slow Sweep Trigger...
Page 38 - Table 1–9: Vectorscope SCH Phase Display
Specifications 1780R-Series Service Manual 1–15 Table 1–7: Vectorscope Vector Display (Cont.) Characteristic PerformanceCheck Step Supplemental Information Performance Requirement Variable GAIN Range +14 dB to –6 dB of 75% color barpreset gain. Unterminated color bar signal canbe brought to appropri...
Page 39 - Table 1–10: CRTs and High Voltage Supplies
Specifications 1–16 1780R-Series Service Manual Table 1–9: Vectorscope SCH Phase Display (Cont.) Characteristic PerformanceCheck Step Supplemental Information Performance Requirement Input Timing Correct relative SCH operationwith displayed video delayed upto 2 m s or advanced up to 1.5 m s relative...
Page 40 - Table 1–12: Environmental Summary
Specifications 1780R-Series Service Manual 1–17 Table 1–11: Power Requirements (Cont.) Characteristic PerformanceCheck Step Supplemental Information Performance Requirement Crest Factor ≥ 1.3. Power Consumption 120 Watts maximum. Table 1–12: Environmental Summary Characteristic Performance Requireme...
Page 41 - Table 1–14: Certifications and Compliances
Specifications 1–18 1780R-Series Service Manual Table 1–14: Certifications and Compliances EC Declaration of Conformity –EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance wasdemonstrated to the following specifications as listed in the Official Journal of the Eur...
Page 43 - Installation; Overview; Table 2–1: 1780R-Series Standard Accessories; Item; Packaging
1780R-Series Service Manual 2–1 Installation Overview This section provides information on both mechanical and electrical installationof the 1780R-Series Video Measurement Set. Be sure to read this material priorto physically mounting the instrument in either a rack mount or portableconfiguration. T...
Page 44 - Rear Panel Connectors
Installation 2–2 1780R-Series Service Manual In addition to the standard accessories in Table 2–1 there are a number ofoptional accessories that can be purchased, such as a portable case, maintenancekits, etc., to complement the 1780R-Series Video Measurement Set. For moreinformation contact a Tektr...
Page 46 - Installation Requirements; Power Source
Installation 2–4 1780R-Series Service Manual Installation Requirements The 1780R-Series is designed for efficient use of rack space. It can be mountedflush with other equipment, eliminating the need for air circulation above andbelow the cabinet. It should not be mounted flush with equipment that is...
Page 47 - Figure 2–2: Settings for the rear-panel mains selector switch; symbol. When setting up the instrument for; Operating Options
Installation 1780R-Series Service Manual 2–5 Figure 2–2: Settings for the rear-panel mains selector switch In addition to being able to configure the 1780R-Series through user interactionwith a series of CRT-presented menus, there are some specific operatingsituations that can be selected by changin...
Page 48 - Name
Installation 2–6 1780R-Series Service Manual Table 2–3: Plug Jumpers for Waveform Board (Assembly A2) (Schematic Diagrams 3 through 15) Jumper Number Name Plug Position Purpose J192<9> Remote Sync Polarity 1-2 { 2-3 Positive Negative J585<10> RGB YRGB 1-2 2-3 { 3-Step RGB Parade 4-Step Y...
Page 50 - Purpose; Factory installed position.; Floating Video Input
Installation 2–8 1780R-Series Service Manual Table 2–5: Plug Jumpers for Vectorscope Board (Assembly A6) and Oscillator Board (Assembly A7) (Cont.) Jumper Number Purpose Plug Position Name J320 (A7)<34> Diff Phase Display 1-2 { 2-3 Double (H)/4 Single (V)/2 { Factory installed position. The vi...
Page 51 - REMOTE Connector
Installation 1780R-Series Service Manual 2–9 The rear-panel REMOTE connector is a subminiature 15-pin D-type receptaclewith female contacts. All the active remote control lines can be forced low byremote ground closures or TTL levels. Pin assignments for the REMOTE connector are shown in Figure 2–4....
Page 52 - SERIAL Interface
Installation 2–10 1780R-Series Service Manual The rear-panel SERIAL interface connector is a 9-pin, sub-miniature, D-typeconnector. It is used as an RS422A or RS232D interface to the 1780R-Seriesmicrocontroller, drivers for both interfaces are resident. RS422A is a balancedvoltage digital interface,...
Page 53 - Figure 2–6: RS232D serial interface adapter diagram; Function; Command Set
Installation 1780R-Series Service Manual 2–11 (of the 9-pin male connector) and pin 7 (of the 25-pin female connector). Inaddition, pins 4 and 5 and pins 6, 8, and 20 of the 25-pin connector will need tobe wired together. See Figure 2–6. Figure 2–6: RS232D serial interface adapter diagram The comman...
Page 54 - Table 2–7: Serial Remote Responses; Command; but can be adjusted for any 600; XY INPUT Connector
Installation 2–12 1780R-Series Service Manual Responses from the 1780R-Series SERIAL interface are shown in Table 2–7. Table 2–7: Serial Remote Responses Command Description A The transmission was successful (ACK) C Command not known. (The # character was received, but was not followed by aU, u, D, ...
Page 55 - Mechanical Installation; NOTE
Installation 1780R-Series Service Manual 2–13 8 1 9 15 Figure 2–7: Rear-panel XY connector diagram showing the function of each pin Mechanical Installation All qualification testing for the 1780R-Series was performed with the rack-mount cabinet installed. To guarantee compliance with specifications,...
Page 56 - Rack Mounting The 1780R-Series; Rack Installation
Installation 2–14 1780R-Series Service Manual Rack Mounting The 1780R-Series The 1780R-Series rack-mounting cabinet is designed for permanent mounting.The instrument slides in and out of the cabinet with relative ease. The instrumentis secured in the cabinet with four 6–32 TORX R drive screws. See F...
Page 59 - Initial Calibration; Portable Case Installation
Installation 1780R-Series Service Manual 2–17 The 1780R-Series can be mounted in a portable case. This case is an optionalaccessory, and is nomenclated 1780F02. The portable case consists of a metalcabinet with feet, front elevating bail, carrying handle (all installed), and frontand back protective...
Page 61 - Push the front-panel CALIBRATE button. Push the button below the; Touch to obtain a menu on the Waveform CRT
Installation 1780R-Series Service Manual 2–19 2. Push the front-panel CONFIGURE button and touch <FIXED CAL AMPL> until 1000 (1.0 Volt) is outlined. 3. Push the front-panel CALIBRATE button. Push the button below the Waveform CRT. 4. <READOUT INTENSITY> will be circled on the Vectorscope...
Page 62 - Figure 2–13: Waveform Calibration menu display; Select and use the large knob to move it 100
Installation 2–20 1780R-Series Service Manual 10. Select <VERT CAL> as shown in Figure 2–13. The large knob will now adjust signal amplitude with respect to the graticule. Adjust for a 1 Voltdisplay on the Waveform CRT. Leave the CALIBRATE button set to On. Figure 2–13: Waveform Calibration me...
Page 63 - Press the CALIBRATE button to exit the menu.; Vectorscope Calibration
Installation 1780R-Series Service Manual 2–21 12. Apply a 1.0 volt signal to the EXT HORIZ input. Touch <EXT HORIZ CAL>. The large knob will now adjust sweep length (time) with respect tothe graticule. Do not change the MAG setting (automatically set to 100mV/div). Adjust the large knob for a ...
Page 65 - Figure 2–15: 1781R (PAL) Vectorscope Calibration menu display
Installation 1780R-Series Service Manual 2–23 Figure 2–14: 1780R (NTSC) Vectorscope Calibration menu display with CAL OSC on Figure 2–15: 1781R (PAL) Vectorscope Calibration menu display
Page 66 - Repackaging; foam between the carton and the instrument.; Seal the carton with shipping tape or an industrial stapler.; Identification Tag
Installation 2–24 1780R-Series Service Manual Repackaging If the instrument is to be shipped to a Tektronix Service Center, attach a tag tothe instrument showing: 1. Owner (with complete address) and the name of the person at your firm that can be contacted. 2. Instrument serial number and a descrip...
Page 70 - Figure 2–18: Front panel of the 1780R-Series Video Measurement Set; INTENSITY. Controls display brightness for the selected CRT.; Display Controls
Operating Information 2–28 1780R-Series Service Manual 1 2 3 4 8 5 6 7 9 10 19 18 17 16 15 11 12 13 14 Figure 2–18: Front panel of the 1780R-Series Video Measurement Set Front-panel Controls With the exception of the POWER switch, all of the switches and controls on the1780R-Series front panel fall ...
Page 71 - Special Purpose Switches
Operating Information 1780R-Series Service Manual 2–29 7. VERT POS. Positions the selected display up and down. Positioning rangedepends on the display selected; range is much greater for the waveformmonitor displays than it is for the vectorscope displays. 8. HORIZ POS. Positions the selected displ...
Page 73 - Functional Measurement Controls; Left Display
Operating Information 1780R-Series Service Manual 2–31 Functional Measurement Controls Functional Measurement Controls are shown in Figure 2–19. Note that thenumerical entries are enclosed in rectangles instead of the circles that were usedin Figure 2–18. 1 2 3 4 8 5 6 7 9 10 19 20 18 17 16 15 11 12...
Page 74 - Right Display
Operating Information 2–32 1780R-Series Service Manual 3. PARADE / OVERLAY. Momentary contact switch that cycles throughselections of sequential displays that can be up to 3 lines or 3 fields on asingle display, depending on the selected waveform sweep. 4. WFM / WFM + CAL. Momentary contact switch t...
Page 78 - Block Diagrams
1780R-Series Service Manual 3–1 Theory of Operation Contents of this section are designed to work with the block and schematicdiagrams in Section 9, at the back of this manual. Each schematic diagramdescription begins with a small block diagram of the circuits on that page and ashort overview relati...
Page 79 - Schematic Diagrams; Block Diagram 4
Theory of Operation 3–2 1780R-Series Service Manual This diagram contains the interface to the front-panel switches, indicators, andtouch panels along with the rear-panel serial and remote connectors. In addition,it contains circuitry that controls internal switching functions and generatesreadout f...
Page 80 - Table 3–1: Schematics and Circuit Board Assemblies; Schematic Name
Theory of Operation 1780R-Series Service Manual 3–3 Table 3–1: Schematics and Circuit Board Assemblies DiagramNumber Schematic Name Assembly Name AssemblyNumber 1 Input Amplifiers A and B1 Input A1 2 Input Amplifiers B2 and B3 Input A1 3 Probe Input & DC Restorer Vectorscope & Waveform A6 &a...
Page 81 - Assembly Name
Theory of Operation 3–4 1780R-Series Service Manual Table 3–1: Schematics and Circuit Board Assemblies (Cont.) DiagramNumber AssemblyNumber Assembly Name Schematic Name 32 Digital Shifter Oscillator A7 33 Horiz AFC & Post Regulators Oscillator A7 34 Diff Gain/Phase Alt Mode Switch Oscillator A7 ...
Page 82 - Diagrams 1 & 2 Input Amplifiers; The input signal is connected to the loop-through BNC
Theory of Operation 1780R-Series Service Manual 3–5 Diagrams 1 & 2 Input Amplifiers The Input board contains four amplifiers that give the input signal gain, DCrestore it, and send it to the + and – Amplifiers. Since they are identical circuits,only the operation of Channel A will be described. ...
Page 84 - Diagram 3 Probe Input and DC Restorer; The Probe Input Amplifier is a high input impedance non-in-
Theory of Operation 1780R-Series Service Manual 3–7 Diagram 3 Probe Input and DC Restorer The 1780R-Series is equipped with a front-panel Probe Input, which allows it tobe used to make some measurements not normally possible with a waveformmonitor or vectorscope. The Probe Input is a high impedance ...
Page 87 - Diagram 4 Input & Reference Selection
Theory of Operation 3–10 1780R-Series Service Manual Diagram 4 Input & Reference Selection The + and – Amplifiers select the appropriate input signal for display. The+ Amplifier output goes to the + input of the Difference Amplifier, while the– Amplifier output goes to the – input. The four vide...
Page 88 - Video Input Selection.; Each video switch is an operational amplifier connected for; Circuit Theory
Theory of Operation 1780R-Series Service Manual 3–11 Video Input Selection. Each video switch is an operational amplifier connected for unity gain, and consists of six differential amplifier inputs. An input is selectedby biasing the appropriate differential pair with current from current sourcesQ14...
Page 89 - Diagram 5 Difference Amplifier & Video Filters
Theory of Operation 3–12 1780R-Series Service Manual Diagram 5 Difference Amplifier & Video Filters The signal at the output of the Difference Amplifier is distributed to manyinternal circuits. Seventy-five-ohm video is provided to the Auxiliary Output andPicture Monitor BNC connectors. There is...
Page 91 - Differentiated Step Filter.
Theory of Operation 3–14 1780R-Series Service Manual Chrominance Filter. The chrominance filter is a Lerner-type filter, exhibiting arithmetic symmetry and linear phase across its bandwidth. U827 amplifies thefiltered chrominance signal to drive both the Waveform Monitor and Vectorscopecircuits. Dif...
Page 92 - Diagram 6 Vertical Deflection; Q619 is a common base amplifier whose voltage output drives
Theory of Operation 1780R-Series Service Manual 3–15 Diagram 6 Vertical Deflection The current output of the filters passes through a common base amplifier whichdrives a Gilbert multiplier (Variable Gain Amplifier). Output current from theVariable Gain Amplifier drives inputs to two separate differe...
Page 93 - Deflection Amplifier.; Q628 and Q427 are a differential pair that generate the
Theory of Operation 3–16 1780R-Series Service Manual gives them five times greater transconductance. Current from U415B is switchedto the appropriate differential pair by U415A and U415D. The differential pairthat is off has a high impedance so that it does not affect the other pair. Thesecond input...
Page 95 - Table 3–2: Input Channel Selection Logic; per i
Theory of Operation 3–18 1780R-Series Service Manual Table 3–2: Input Channel Selection Logic per i M e p (U1415) (U1415) ParMode Internal Reference Operating Mode Input(s) I 1 I 2 I 3 I 4 I 5 I 6 I 7 I 8 SINGLE INPUT A 0 0 0 0 0 0 0 0 CH A SINGLE INPUT B1 0 0 0 1 0 0 0 0 CH B1 SINGLE INPUT B2 0 0 1...
Page 98 - Diagram 8 Reference Sync Generation; Internal Sync Separator.; The internal video is input through a 1.5 MHz active
Theory of Operation 1780R-Series Service Manual 3–21 Diagram 8 Reference Sync Generation Both Internal and Reference sync inputs are filtered by active low-pass filters.The Internal Sync Separator is a descrete clamped operational amplifier circuitthat is clamped just above sync tip level to clip of...
Page 99 - Reference Sync Separator.; The selected reference video is input through a; Sync Locked Oscillator.; The Sync Locked Oscillator is locked to sync by a PLL; Reference Sync Phase.; The Sync Locked Oscillator output is input to one port of
Theory of Operation 3–22 1780R-Series Service Manual R1156 and R1253 setting the AC gain. CR1155, CR1254, U1159A, and C1254form the feedback clamp. The clamp sets sync tip to +3 V at the operationalamplifier output (U1159 pin 1). U1159B and R1260 provide a constant currentdischarge path for C1254 du...
Page 101 - Diagram 9 H & V Sync Generators; Ref or Remote Sync Switch.; U185A-C-D form a logic switch that selects between
Theory of Operation 3–24 1780R-Series Service Manual Diagram 9 H & V Sync Generators The Horizontal and Vertical (line and field) Sync Generators extract thesynchronizing signals from the output of the Reference Sync Separator (Diagram 8) or the Remote Sync Input to supply the required sync sign...
Page 104 - Clamp Pulse Generator for Waveform Display.; U858B is a retriggerable one-shot
Theory of Operation 1780R-Series Service Manual 3–27 too long for PAL signals, a jumper (on Diagram 10) is provided to realign theFld Retrace Gate with V sync. See Field Sweep Gate description, on Diagram10, for details. Clamp Pulse Generator for Waveform Display. U858B is a retriggerable one-shot m...
Page 105 - Diagram 10 Ramp Generator; In the line sweep modes the LINE control line is high, U880B
Theory of Operation 3–28 1780R-Series Service Manual Diagram 10 Ramp Generator The Ramp Generators produce the line and field sweep ramps for the waveformdisplays. The slope of the ramp, for 1- 2- or 3-line or field sweep, is controlledby a Digital-to-Analog Converter (DAC). Initiation of retrace an...
Page 106 - Line Ramp Generator.; The Ramp Generator consists of an integrator-connected
Theory of Operation 1780R-Series Service Manual 3–29 When the sweep ramp has reached approximately 3/4 of its final amplitude theEnd of Sweep Detector outputs a high on the pin 1 input of U775A (OR gate) toprovide a high on one input of U780A (an AND gate). The next +Ref H syncwill AND U780A causing...
Page 107 - Field Ramp Generator.; Ramp Attenuator for External Staircase.; When the /RGB EN control line is pulled; End of Sweep Detector.; U690A and U690B are connected as voltage comparators.
Theory of Operation 3–30 1780R-Series Service Manual In 3-field sweep modes the FLD Retrace Gate is always high. The Field RampGenerator End of Sweep Detector outputs a high in the last third of the ramp.ANDing through U760B does not occur until significantly after the second Vsync to ensure that th...
Page 108 - Retrace Switch Blanking.; Sweep blanking occurs whenever the output of U775D
Theory of Operation 1780R-Series Service Manual 3–31 Whenever either End of Sweep Detector goes high U790B outputs a correspond-ing high (Trig En) to synchronize cursor display, calibrator display, anddifferential gain and phase displays. Retrace Switch Blanking. Sweep blanking occurs whenever the o...
Page 109 - Diagram 11 Horizontal Magnifier & Output Amplifiers; The Magnifier Amplifier is an inverting, feedback amplifier with
Theory of Operation 3–32 1780R-Series Service Manual Diagram 11 Horizontal Magnifier & Output Amplifiers The Magnifier Amplifier provides selection of fixed voltage gains for the Lineand Field Ramp Generator sweep ramps. This provides the time per divisionvariation on the horizontal axis of the ...
Page 112 - Diagram 12 Horizontal Latches & DAC; Latch Select Decoder.; The Latch Select Decoder generates the clock for the eight
Theory of Operation 1780R-Series Service Manual 3–35 Diagram 12 Horizontal Latches & DAC Eight-bit digital data from the Microprocessor, used to control horizontal as wellas some vertical functions, is latched onto the circuit board. A Latch SelectDecoder, using three address bits, controls the ...
Page 114 - Diagram 13 Slow Sweep & Ext Horiz Input; volts to produce a 10-division sweep ramp.
Theory of Operation 1780R-Series Service Manual 3–37 Diagram 13 Slow Sweep & Ext Horiz Input The External Horizontal Input Amplifier is a non-inverting amplifier that inputsa ramp voltage of ≈ 5 volts to produce a 10-division sweep ramp. The Slow Sweep Ramp Generator produces a ramp that is trig...
Page 115 - Slow Sweep Ramp Generator.; The ramp is produced by an integrator that consists
Theory of Operation 3–38 1780R-Series Service Manual 50% to above, the output of the amplifier changes from being limited at thepositive supply to being limited at the negative supply. This negative transition iscoupled through C557, turning on Q658 to begin the ramp. When Slow Sweep Trigger is set ...
Page 116 - Diagrams 14 & 15 SCH Phase Timing & Sync Locked Oscillator; The Sync Locked Oscillator consists of a 4; oscillator that is divided by
Theory of Operation 1780R-Series Service Manual 3–39 Diagrams 14 & 15 SCH Phase Timing & Sync Locked Oscillator The 1780R-Series displays the horizontal sync to subcarrier phase relationship asa polar plot on its Vectorscope CRT. It generates a subcarrier rate signal, phaselocked to the 50% ...
Page 117 - SCH Sync Locked Oscillator.; when there is 5.5 volts on the varactor.
Theory of Operation 3–40 1780R-Series Service Manual Logic and Timing to control the oscillator is generated, based upon the burst-sync relationship of reference video. Also, field identification information isprovided to the MPU for line select. Finally, the burst-sync relationship of the reference...
Page 119 - feedback signal will sometimes be low
Theory of Operation 3–42 1780R-Series Service Manual U1497B is a D-type flip-flop that generates a negative pulse ( Q ) to turn on U1397 immediately after the Sample Gate again goes low. This flip-flop-gener-ated TSC pulse is approximately 1 subcarrier cycle in duration. Lock detection is done by U1...
Page 123 - Diagram 17 Dynamic RAM; Address Multiplexer.; The Address Multiplexer consists of two 74ALS158 (Quad
Theory of Operation 3–46 1780R-Series Service Manual Diagram 17 Dynamic RAM The Dynamic Random Access Memory (DRAM) is a 16-bit wide memory usedby the readout engine for its instructions. The system consists of three majorcomponents; the memory array, an address multiplexer, and a control PAL. Theme...
Page 126 - Diagram 18 Line Rate Controller
Theory of Operation 1780R-Series Service Manual 3–49 Diagram 18 Line Rate Controller The Line Rate Controller provides real time control of the readout and line selectfunctions for both the waveform monitor and vectorscope CRTs. It issuesinstructions to start, stop, hold, or skip readout. It determi...
Page 134 - Diagram 20 Readout Engine & Read Output; The 4 MSBs of data from the Dynamic Random Access Memory
Theory of Operation 1780R-Series Service Manual 3–57 Diagram 20 Readout Engine & Read Output The asynchronous Readout Engine outputs the readout characters that aredisplayed on the vectorscope and waveform monitor CRTs. Digital data from theDynamic RAM is converted to an analog output for displa...
Page 137 - Diagram 21 Interconnect; U105 is the I/O to the External Data Bus. It is a tri-state device; Programmed Logic Array.; U305 outputs clock signals, enables, and control
Theory of Operation 3–60 1780R-Series Service Manual Diagram 21 Interconnect All inputs to and outputs from the MPU circuit board are through the Intercon-nect. There are two connectors on the MPU Interconnect, one that ties into the1780R-Series main Interconnect circuit board, and one that serves a...
Page 142 - Diagram 25 Vectorscope Input & Gain; U585 and U686 are rising edge triggered, multiple D-type
Theory of Operation 1780R-Series Service Manual 3–65 Diagram 25 Vectorscope Input & Gain The Data Latches decode the Vectorscope operating instructions from the MasterMPU. Two of the circuits controlled by these instructions, Chroma Amp andTest Circle Oscillator, appear on this schematic. The Te...
Page 143 - Vectorscope Gain Cell.; U473 is an operational amplifier whose positive input is; Test Circle Oscillator.; U486B is another section of the DIP switch. When the CAL
Theory of Operation 3–66 1780R-Series Service Manual Chroma Amp. U486D is one section of a dual-in-line package (DIP) of switches that closes on a low control input (pin 16) and opens on a high. When the switchis open, Q573 turns on and parallels R566 with a network made up of C570,R571, and R568 to...
Page 144 - Diagram 26 Diff Phase/Gain; Differential Phase Demodulator.; U267 is a balanced demodulator used to recover
Theory of Operation 1780R-Series Service Manual 3–67 Diagram 26 Diff Phase/Gain The Differential Gain and Phase Demodulators change a subcarrier rate signalinto DC currents proportional to chroma amplitude (gain) and phase. Theresultant current is limited (to prevent driving down-stream amplifiers i...
Page 145 - Differential Gain Demodulator.; U261 is a balanced demodulator used as an
Theory of Operation 3–68 1780R-Series Service Manual The DP Zero adjustment, C172, provides a small amount of delay to theswitching signal in order to have the demodulator timed to the R-Y Demodulator(Diagram 28). Differential Gain Demodulator. U261 is a balanced demodulator used as an envelope dete...
Page 146 - Demodulator Switching.; U386A and B control the selection of the demodulators.
Theory of Operation 1780R-Series Service Manual 3–69 for a DC level of 1 volt, with no chroma, to accommodate the Recursive Filter(Diagram 35). Demodulator Switching. U386A and B control the selection of the demodulators. For either dG or dP the Preset and Clear for U386B controls the selection of t...
Page 147 - Diagram 27 Vector Timing & Blanking
Theory of Operation 3–70 1780R-Series Service Manual Diagram 27 Vector Timing & Blanking The Vectorscope display selection, chroma clamp, center dot clamp, and SCHblanking signals for the Vectorscope are generated by the Vector Timing circuits.In addition, the switching of the SCH and Vectorscop...
Page 148 - Control Signal Generator.; Signals to control timing and blanking of the Vector-; Center Dot Comparator.; The Vertical and Horizontal Deflection Amplifier input
Theory of Operation 1780R-Series Service Manual 3–71 The input H sync pulse width, which is regenerated, is approximately a half linein duration. In order to provide a uniform duration, usable H sync is shaped by amonostable pulse shaper. Its output is supplied to the Differential Gain and Phasecirc...
Page 149 - Horizontal Sync Pulse Shaper.; U695A is a monostable one-shot that regenerates a; Center Dot Blanking Logic.; The gates in U327 and U333 make the blanking
Theory of Operation 3–72 1780R-Series Service Manual deflected away from the center, one or two of the comparators will drive asumming point, at the emitter of Q323 (a common base amplifier) and turn it on.When Q323 turns on, its collector goes low to disable U327C. Whenever there isno deflection an...
Page 150 - Diagram 28 Demodulators; from the Subcarrier Regenerator as its; Center Dot Position Clamps.; The R-Y Amplifier output is fed back to the Vertical
Theory of Operation 1780R-Series Service Manual 3–73 Diagram 28 Demodulators Chrominance from the Gain Cell is clamped to 0 volts. The Vertical andHorizontal Center Dot Clamps provide a fixed bias level to the demodulatorswhen the Chroma Clamp forces the signal input to 0 volts. The Vertical Demodul...
Page 152 - Diagram 29 XY Inputs & PIX Monitor; Picture Monitor Horizontal Sweep.; Q602 is turned on by H rate sync to start; Picture Monitor Vertical Sweep.; Q403 is turned on by V rate sync to start U506D,
Theory of Operation 1780R-Series Service Manual 3–75 Diagram 29 XY Inputs & PIX Monitor Picture monitor sweeps and XY input signals drive the Deflection Amplifiersthrough switching circuits on the Deflection Amplifier schematic diagram. TheSweep Generators have sufficient gain range to accommoda...
Page 153 - XY Input Amplifiers.; to
Theory of Operation 3–76 1780R-Series Service Manual XY Input Amplifiers. U211 is a quad, J-FET input operational amplifier. U211A and C are balanced Differential Input Amplifiers intended for audio use. In a 600 W system, R113 and R308 can be adjusted to normalize signals from 0 dBm to +12 dBm (2 -...
Page 154 - Diagram 30 Vector Deflection Amps
Theory of Operation 1780R-Series Service Manual 3–77 Diagram 30 Vector Deflection Amps Demodulated R-Y (V) and B-Y (U) is amplified and input to a switching circuitcontrolled by the Master MPU acting on front-panel switch selections. WhenVector or SCH display is selected, the Demodulated R-Y (V) is ...
Page 155 - Low-Pass Filter and Luminance Amplifier.; Luminance signal from the waveform
Theory of Operation 3–78 1780R-Series Service Manual Horizontal and vertical readout (from the MPU), X and Y output, and picturemonitor sweeps are input directly to the switching circuit for display on theVectorscope CRT. Input signal switching to the Deflection Amplifiers is Master MPU controlled i...
Page 156 - Deflection Amplifiers.; The amplifiers are nearly identical. The Vertical Amplifier,
Theory of Operation 1780R-Series Service Manual 3–79 Deflection Amplifiers. The amplifiers are nearly identical. The Vertical Amplifier, which has VHF Compensation (C614), consists of Q611 and Q617 (a differentialpair) and Q710 and Q719 (grounded base amplifiers) that speed up the amplifierby minimi...
Page 157 - Diagram 31 Subcarrier Regenerator; . The VCXO output is divided down by 4 to
Theory of Operation 3–80 1780R-Series Service Manual Diagram 31 Subcarrier Regenerator The Reference Video signal from the Waveform Monitor Reference switch(Diagram 4) is buffered and bandpass filtered before being mixed with theVoltage-Controlled Crystal Oscillator (VCXO) output to produce a contro...
Page 160 - reference; as the reference source. U266C is an
Theory of Operation 1780R-Series Service Manual 3–83 C394 is lowered ≈ 1/3 for PAL instruments. U397 is a strobe-controlled complementary output comparator. U397 provides TTL outputs, at External CWfrequency, to the Input Switch, U469, from the bandpass filtered EXT CWsignal. The strobe signal is di...
Page 161 - Diagram 32 Digital Phase Shifter
Theory of Operation 3–84 1780R-Series Service Manual Diagram 32 Digital Phase Shifter The Digital Phase Shifter uses the input subcarrier frequency to generate anintermediate and somewhat lower subcarrier frequency. The intermediatesubcarrier, which is divided into 7200 parts, is used to load a Micr...
Page 162 - VCXO and
Theory of Operation 1780R-Series Service Manual 3–85 In addition, the divided by 7200 F SC ’ produces the counter load pulse for a Programmable Divide by 7200 Counter that outputs the reference phase to thePhase Detector in the output phase-lock loop. The output phase-lock loop mixes the F SC ’ sign...
Page 163 - VCXO and 4 Counter.
Theory of Operation 3–86 1780R-Series Service Manual U338. RCO from U342 is the counter load for the programmable counter ( ÷ M and ÷ N). The input register for the programmable counter (U235 and U238) is loaded witha count from the Microprocessor Data Bus. This count is in the form of two 8-bitword...
Page 164 - Diagram 33 Horizontal AFC & Post Regulators; Error Amplifier and Acquisition Sweep.
Theory of Operation 1780R-Series Service Manual 3–87 Diagram 33 Horizontal AFC & Post Regulators REF SYNC, originating from the H Sync Generator on Diagram <9>, iscompared to the H rate sync divided down from the VCO by a Phase Detector. Ifthey are not phase locked, the Error Amplifier out...
Page 165 - VCO and Frequency Divider.; The active components of the VCO are high-speed
Theory of Operation 3–88 1780R-Series Service Manual up, the output of the Phase Detector falls below the trigger threshold of theunijunction-wired Acquisition Sweep (Q411 and Q412), to turn off the ramp. Ifthe loop unlocks, the output of the Phase Detector (through the Error Amplifier)goes above th...
Page 166 - Diagram 34 Diff Gain/Phase Alt Mode Switch; Demodulated Chroma Source Switch.; U217 is a set of analog switches, controlled
Theory of Operation 1780R-Series Service Manual 3–89 Diagram 34 Diff Gain/Phase Alt Mode Switch The 1780R-Series offers a choice of either single display mode or a doubledisplay mode that can be nulled. The Alternate, or double mode, is switchedabout itself to display a mirror image. Sources of chro...
Page 168 - Diagram 35 Digital Recursive Filter
Theory of Operation 1780R-Series Service Manual 3–91 Diagram 35 Digital Recursive Filter The Digital Recursive Filter reduces the noise content of differential phase anddifferential gain signals without impacting the spectral response below 500 kHzby reinforcing the harmonic frequencies that are mul...
Page 170 - Table 3–4: Memory Switch Outputs; High; Address Counter and CPU Access.; s AFC sync
Theory of Operation 1780R-Series Service Manual 3–93 Storage. The data stored in Static Random Access Memory (U251 and U260) is from the conversion of the previously-sampled video line and is at the samepoint that the A/D Converter is outputting from the current line. During the readoperation, the 1...
Page 171 - Memory Write Control.; The Memory Write Control uses the R/W pulse to control
Theory of Operation 3–94 1780R-Series Service Manual U400B is clocked by U261 when either /RD or /WR goes low while /Fltr Brd islow. An Exclusive OR gate internal to U261 outputs the INC pulse andincrements the Address Counter. Incrementing the Address Counter toggles theA0 (U271-14) output, which i...
Page 174 - Diagrams 37 & 38 Timing Cursors & Counters
Theory of Operation 1780R-Series Service Manual 3–97 Diagrams 37 & 38 Timing Cursors & Counters The timing cursors for the 1780R-Series are narrow bright-up pulses applied tothe CRT cathode. They can be moved independently in 5-nanosecond intervals.The Microprocessor keeps track of the time ...
Page 176 - Cursor Versus Sweep Synchronization and Cursor Enable.; The timing cursors
Theory of Operation 1780R-Series Service Manual 3–99 Sample-and-Hold. During the time that the LC Oscillator is being checked against the 10 MHz Reference, U406A is closed and U406B is open; during the timethat timing cursor information is being output, the switches are in the oppositeconfiguration....
Page 177 - Digital Delay and Counters.
Theory of Operation 3–100 1780R-Series Service Manual The output from U429B drives U223B, which enables the Digital DelayCounters. U429B and U223B are both cleared with the /RAMP START signal,which becomes true at the end of the digital count from the delay counters. The remaining outputs from U426 ...
Page 179 - Diagram 39 CRT Display DAC
Theory of Operation 3–102 1780R-Series Service Manual Diagram 39 CRT Display DAC The CRT Display DAC decodes digital information from the MicroprocessorData Bus to drive 16 analog control voltage outputs. This digital information isthe current setting of front-panel controls, such as Focus and Inten...
Page 180 - Analog Multiplexers.; U346 and U348 are Analog Multiplexers. Each has one
Theory of Operation 1780R-Series Service Manual 3–103 Analog Multiplexers. U346 and U348 are Analog Multiplexers. Each has one input and eight outputs; the input is the analog signal level from the DAC. Theoutputs are normally high impedance disconnects, except when one is selectedby the digital wor...
Page 181 - Diagrams 40 & 45 Scale Illum & Trace Rotation – Graticule Lights
Theory of Operation 3–104 1780R-Series Service Manual Diagrams 40 & 45 Scale Illum & Trace Rotation – Graticule Lights A Triangle Generator is employed to provide a triangular waveform to drive oneinput of the Pulse Width Modulators. Pulse Width Modulators are voltagecomparators that compare...
Page 184 - Diagram 41 Vector High Volts
Theory of Operation 1780R-Series Service Manual 3–107 Diagram 41 Vector High Volts The Waveform Monitor high voltage supply generates all of the potentialsrequired to power the CRT, except for the deflection voltages. The high voltageis derived from an Armstrong Oscillator-generated 33-kHz signal. T...
Page 185 - Grid Drive Rectifier.
Theory of Operation 3–108 1780R-Series Service Manual C130 provides a low impedance current path for the base drive winding of T240.R222 limits Q221 base current. Power Supplies. CR151 is a potted assembly of diodes and capacitors which provides a DC output equal to four times the peak input voltage...
Page 187 - Diagram 42 Waveform High Volts
Theory of Operation 3–110 1780R-Series Service Manual Diagram 42 Waveform High Volts The Waveform Monitor high voltage supply generates all of the potentialsrequired to power the CRT, except for the deflection voltages (however,+160 volts for the Horizontal Deflection Amplifier is generated by these...
Page 189 - Z-axis high frequency information is fed to the CRT control
Theory of Operation 3–112 1780R-Series Service Manual Grid Drive Rectifier. Z-axis high frequency information is fed to the CRT control grid through C240. Low frequency information is through C241. The Grid DriveRectifier, consisting of CR140 and CR141, is a voltage doubler that convertspeak-to-peak...
Page 190 - Diagram 43 Low Voltage Power Supply
Theory of Operation 1780R-Series Service Manual 3–113 Diagram 43 Low Voltage Power Supply The low voltage power supply is a line operated switcher, of the discontinuousflyback type, running at 40 kHz. The switching transistor saturates, placing theprimary voltage across the primary winding. Due to t...
Page 191 - Line Rectifier and Filter.
Theory of Operation 3–114 1780R-Series Service Manual The primary side of the circuit is not referenced to chassis ground and typically,the line common rides at – 150 volts, unless an isolation transformer is used. Anisolation transformer between the instrument and the mains power will let theline s...
Page 193 - Under Voltage Disabler.; Q560 turns on when the base drive power supply drops; Current Limit Time Latch.; The Comp input of U460 rises above 4 volts when it is
Theory of Operation 3–116 1780R-Series Service Manual Pin 1 of U460 is the Error Amplifier output. Pin 2 is the minus input to the ErrorAmplifier, the positive terminal is internally connected to +2.5 volts. Pin 3 is thecurrent sense input, and pin 6 is the controller output, driving the base drivec...
Page 194 - Power Switch Oscillator.; The primary winding of T130 is the resonant element in
Theory of Operation 1780R-Series Service Manual 3–117 Output Filters. The filters are all the standard pi configuration except the –8 volt filter. There are three powdered iron beads (L420, L421, and L422) on the+5 volt secondary wires to help raise the other output voltages to the propervalues. Err...
Page 197 - Performance Verification; Recommended Equipment List; Table 4–1: Recommended Equipment; Electrical Instrument
1780R-Series Service Manual 4–1 Performance Verification This section consists of the Performance Check, used to determine compliancewith the Performance Requirements listed in the Specifications section. Controls and connectors on the 1780R-Series front panel and rear panel are fullycapitalized (e....
Page 200 - Figure 4–1: 5% signal Attenuator for checking differential gain
Performance Verification 4–4 1780R-Series Service Manual Table 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 21. X Y Input Connector Fifteen-pin, subminiature D-type connec-tor modified to input the audio signal for XY checks and adjustments. See Figure4–2...
Page 201 - Figure 4–3: REMOTE connector modified for Remote Sync input
Performance Verification 1780R-Series Service Manual 4–5 Figure 4–2: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 canbe used to make ground connections.) Figure 4–3: REMOTE connector modified for Remote Sync input
Page 202 - Figure 4–4: RGB Parade Display Test Connector
Performance Verification 4–6 1780R-Series Service Manual Figure 4–4: RGB Parade Display Test Connector
Page 203 - Short Form Procedure
Performance Verification 1780R-Series Service Manual 4–7 Short Form Procedure The Short Form Performance Check is provided for those familiar with thecomplete check procedure, and the Standard Performance Check Procedure isprovided for those who need more detailed instructions. Both forms of the per...
Page 206 - Performance Check Procedure; Table 4–2: 1780R-Series Initial Control Settings; Setting
Performance Verification 4–10 1780R-Series Service Manual Performance Check Procedure This Performance Check Procedure is a continuous sequential procedure. If astep is performed out of sequence, pertinent control settings are given within thestep. Remaining control settings can be determined by ref...
Page 207 - Preliminary Setup
Performance Verification 1780R-Series Service Manual 4–11 NOTE . Leave the 1780R-Series internal jumpers in their factory-set positions unless directed otherwise. The factory-set positions are listed in Section 2,Installation, Electrical. Install the metal cover on the instrument and leave it instal...
Page 209 - g. Select VAR on the Waveform CRT menu. Check that ABS on the menu
Performance Verification 1780R-Series Service Manual 4–13 b. Set the VAC output amplitude to 999.9 mV. Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that the correcttelevision standard (NTSC, PAL, or PALM) is selected. NOTE . Leave the VAC +Lum and Lum/Sync buttons a...
Page 211 - b. Select WAVEFORM GAIN–VAR. Check that RIGHT DISPLAY–WFM; and INPUT–CH A are selected.; d. Turn the variable WAVEFORM GAIN control to obtain a minimum; Disconnect the Pulse & Bar signal from the instrument.
Performance Verification 1780R-Series Service Manual 4–15 b. Select WAVEFORM GAIN–VAR. Check that RIGHT DISPLAY–WFM and INPUT–CH A are selected. c. Use the VERT POS control to position the waveform backporch orblanking level to the graticule 0 IRE graticule line for NTSC (0.3 V forPAL) on the Wavefo...
Page 213 - Check Voltage Cursor Accuracy; CURSOR 2 trace on the Calibrator signal bottom trace.; Check Maximum DC Output Voltage; Supplemental: AUX OUT and PIX MON OUT connectors:; a. Check that no signal is applied to the 1780R-Series CH A INPUT; connector. Check that CH A INPUT is selected.
Performance Verification 1780R-Series Service Manual 4–17 6. Check Voltage Cursor Accuracy Requirement: Accuracy: ± 0.2%. Resolution: 1 mV. a. With no signal applied to CH A INPUT, set the front-panel controls and menu selection as follows: RIGHT DISPLAY–WFM+CAL, WFMHORIZONTAL–ONE–LINE, VOLTAGE CURS...
Page 214 - d. Connect a coaxial cable from the 1780R-Series AUX OUT connector,; g. Check that the DC level, displayed on the test oscilloscope CRT, is
Performance Verification 4–18 1780R-Series Service Manual d. Connect a coaxial cable from the 1780R-Series AUX OUT connector, through a precision (0.2%) 75 W feed-through terminator, to Ch 1 Input on the test oscilloscope. NOTE . The precision terminator is listed under Auxiliary Equipment. It is al...
Page 217 - w. Move the coaxial cable from the PIX MON OUT connector to the AUX
Performance Verification 1780R-Series Service Manual 4–21 r. Move the VAC output signal from the CH B3 INPUT to the CH AINPUT. Connect a coaxial cable from the CH A INPUT loop-throughconnector to the +Input of the test oscilloscope Differential Comparator. s. Connect another coaxial cable from the P...
Page 218 - Requirement: Flat frequency response from 50 kHz to 10 MHz within
Performance Verification 4–22 1780R-Series Service Manual ae. Select RELATIVE on the Vectorscope CRT menu. Press the REF- ERENCE SET button. Note that the D V readout is 100.0% on the Waveform CRT. af. Move the coaxial cable with the 50 W -to-75 W minimum loss attenuator from the CH A INPUT connecto...
Page 221 - % of the reference amplitude. 10 MHz to 15 MHz should be; a. Connect the leveled sine wave generator output, through a 50; a. Connect the leveled sine wave generator output, through a 50; minimum loss attenuator, to the AUX IN connector.
Performance Verification 1780R-Series Service Manual 4–25 a. Connect the leveled sine wave generator output, through a 50 W -to-75 W minimum loss attenuator, to the CH B2 INPUT connector. Do notterminate the loop-through connector. b. Select INPUT–CH B2. c. Check repeat step 11b. through 11p. to che...
Page 223 - Check X1 Probe Frequency Response
Performance Verification 1780R-Series Service Manual 4–27 Figure 4–9: Connections for checking AUX OUT frequency response. (Only Ch 1 ofthe test oscilloscope dual-trace unit is used.) g. Set the generator to each of these frequencies: 3.58 MHz (4.43 MHz for PAL), 5 MHz, 8 MHz, and 10 MHz. h. Check t...
Page 226 - m. Set the generator frequency to 300 kHz.; Select FILTER–FLAT mode.; v. Check that the displayed amplitude is between 707 mV and 721 mV or
Performance Verification 4–30 1780R-Series Service Manual c. Set the generator frequency to 50 kHz (reference). Set the generatoroutput amplitude so the waveform CRT display is exactly 714 mV or100 IRE in amplitude for NTSC (700 mV for PAL). d. Select FILTER–LUM mode. e. Check that the displayed amp...
Page 227 - af. Disconnect the sine wave signal from the instrument.; Generator Linearity module, through a 75; b. Set the 1780R-Series controls as follows: WFM HORIZONTAL–TWO–; Select COUPLING–AC on the Configure menu.; g. Check that the signal blanking level bounces up and down.; Select DC RESTORER–FAST on the menu.
Performance Verification 1780R-Series Service Manual 4–31 x. Check that the displayed amplitude is equal to or greater than 500 mV or 70 IRE for NTSC (490 mV for PAL). y. Set the generator frequency to 2.68 MHz (3.53 MHz for PAL). z. Check that the displayed amplitude is equal to or less than 500 mV...
Page 230 - d. Use the VERT POS control to move the signal baseline between the; Set the MAGNIFIER and WAVEFORM GAIN–X5 to Off.; g. Leave the Pulse & Bar signal connected to the CH A INPUT connector.; Select CLAMP–ST on PAGE 1 of the Configure menu.; h. Select CLAMP–BP on the Configure menu. Set the generator Burst; Leave the Pulse & Bar signal connected to the instrument.
Performance Verification 4–34 1780R-Series Service Manual b. Set the generator Luminance button to On (pressed in). c. Set the 1780R-Series controls as follows: INPUT to CH A, WFMHORIZONTAL to ONE–LINE, MAGNIFIER to 1.0 m s/DIV, and WAVEFORM GAIN to X5. d. Use the VERT POS control to move the signal...
Page 231 - Table 4–3: Common Mode Rejection; Frequency; on the Waveform CRT is 140 IRE for NTSC (1 V for NTSC or PAL).
Performance Verification 1780R-Series Service Manual 4–35 25. Check Filter DC Matching Supplemental: (not listed in Section 2); Matching: Within 10 IRE for NTSC(70 mV for PAL). a. Check that a Pulse & Bar signal is applied to the 1780R-Series CH A INPUT connector. b. Set the 1780R-Series control...
Page 233 - Check Differentiated Steps; to the graticule centerline on the Waveform CRT.; h. Check that the subcarrier attenuation is 40 dB or 2 IRE for NTSC; Leave the Modulated Staircase signal connected to CH A INPUT.
Performance Verification 1780R-Series Service Manual 4–37 button to CH B1 when setting the display reference amplitude and thenselect INPUT B1B3 to check common mode rejection). u. Disconnect the dual-input coupler and the sine wave signal from the instrument. 27. Check Differentiated Steps Requirem...
Page 238 - Line; a. Check that no signal is applied to the CH A INPUT. Check that Black
Performance Verification 4–42 1780R-Series Service Manual h. Select CURSOR 1 on the Waveform CRT. i. Turn the Precision Measurement knob so that CURSOR 1 bright-up spotoverlays CURSOR 2 bright-up spot. j. Check that the D T readout on the Waveform CRT is between 63.550 m s and 63.560 m s. (The reado...
Page 242 - Check External Horizontal Input Sensitivity; Check that the horizontal sweep length is 9 to 11 major divisions.; g. Disconnect the VAC signal from the EXT HORIZ input connector.
Performance Verification 4–46 1780R-Series Service Manual h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 0 V to +10 Vsquare waves as displayed on the test oscilloscope CRT. i. Disconnect the function generator output ...
Page 243 - h. Check that the trace on the Waveform CRT moved downward 50 IRE to; the 0 IRE graticule line within a tolerance of
Performance Verification 1780R-Series Service Manual 4–47 c. Check and/or set the 1780R-Series controls as follows: LEFT DIS-PLAY–VECT, RIGHT DISPLAY–WFM, REF–EXT, and WFMHORIZONTAL ONE–LINE. d. Press the MEASURE button to On. Select DIFF GAIN, SINGLE, and NOISE REDUCTION–OFF on the Vectorscope CRT ...
Page 250 - a. Connect a BNC T connector to the output of the leveled sine wave
Performance Verification 4–54 1780R-Series Service Manual o. Turn the Subcarrier dial on the television test signal generator to place the red vector dot on the 210 _ graticule line on the 1780R-Series Vectorscope CRT. Turn the 1780R-Series Precision Measurement controlto reposition the red vector d...
Page 251 - h. Set the generator output frequency to 3.979545 MHz and then to; Disconnect the sine wave signal from the instrument.; Check Vector Display Phase and Gain Accuracy; graticule line as displayed on the Vectorscope CRT. (For PAL,
Performance Verification 1780R-Series Service Manual 4–55 Figure 4–10: Vector graticule showing the –3 dB points for checking frequencyresponse f. Set the generator output frequency to 2.979545 MHz for NTSC(3.833619 MHz for PAL). g. Check that the circle displayed on the Vectorscope CRT is smaller t...
Page 257 - Figure 4–11: Properly adjusted xy input gains
Performance Verification 1780R-Series Service Manual 4–61 Figure 4–11: Properly adjusted xy input gains 55. Check X Y Frequency Response Requirement: Frequency Response: DC to >500 kHz. a. Connect the leveled sine wave generator output signal to pin 3 of the 1780R-Series rear panel X Y INPUT conn...
Page 259 - Figure 4–12: Connections for checking line strobe pulse timing; h. Push the 1780R-Series LINE SELECT button. Turn on the touch screen
Performance Verification 1780R-Series Service Manual 4–63 e. Check that the SCH dot is located near the compass rose and that it iswithin 5 _ of the 180 _ axis for NTSC or PAL. f. Connect the Frame/Black (NTSC) or Frame Ref (PAL) signal from thetelevision generator to the CH 1 Input to the test scop...
Page 263 - Figure 4–14: Measuring return loss of 1780R-Series CH A INPUT; This completes the Performance Check Procedure.
Performance Verification 1780R-Series Service Manual 4–67 Figure 4–14: Measuring return loss of 1780R-Series CH A INPUT f. Check that the return loss of the CH A INPUT is better than 40 dB for afrequency range from 50 kHz (reference) to 5 MHz. Make this check,within this frequency range, with instru...
Page 266 - General Information; the CRT bezel assembly.
1780R-Series Service Manual 5–1 Adjustment Procedures This section of the 1780R-Series Service Manual consists of an AdjustmentProcedure. The Performance Verification is used to evaluate operation of theinstrument as specified in the Performance Requirements in Specifications. TheAdjustment Procedur...
Page 267 - Figure 5–2: Calibrate menu as displayed on the Vectorscope CRT
Adjustment Procedures 5–2 1780R-Series Service Manual Figure 5–1: Simplified representation of the 1780R-Series Video Measurement Set,showing the location of the four control groups The Precision Measurement Control is multifunctional. Its function is assignedeither by the accompanying switches or t...
Page 268 - Figure 5–3: 1780R-Series circuit board assembly locations
Adjustment Procedures 1780R-Series Service Manual 5–3 The <> switches below the Precision Measurement Control knob duplicate itsfunction, allowing a single increment of change per push. The instrument is made up of a number of etched circuit boards. Adjustments arepresent on most of the boards...
Page 269 - Table 5–1: Recommended Equipment
Adjustment Procedures 5–4 1780R-Series Service Manual Recommended Equipment List Table 5–1: Recommended Equipment Electrical Instrument Performance Requirements Example Electrical Instruments 1. Test Oscilloscope Vertical Amplifier Differential Comparator with 30 MHzbandwidth and 1 mV sensitivity. D...
Page 272 - Figure 5–5: RGB Parade Display Test Connector
Adjustment Procedures 1780R-Series Service Manual 5–7 Figure 5–4: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 canbe used to make ground connections.) Figure 5–5: RGB Parade Display Test Connector
Page 273 - Adjustment List; Table 5–2: 1780R-Series Adjustments for Calibration Procedure; Adjustment Name
Adjustment Procedures 5–8 1780R-Series Service Manual Adjustment List Table 5–2 lists all of the adjustments by step number sequence. This table can beused as a short form adjustment procedure for those who are familiar with theadjustment procedure for the 1780R-Series. Table 5–2: 1780R-Series Adjus...
Page 277 - Procedure; Table 5–3: 1780R-Series Initial Control Settings
Adjustment Procedures 5–12 1780R-Series Service Manual Procedure This Adjustment Procedure is a continuous sequential procedure. If a step isperformed out of sequence, pertinent control settings are given within the step.Remaining control settings can be determined by referring to Table 5–3;however,...
Page 278 - Equipment Connections; d. Press the CONFIGURE button to On. Set the front-panel controls and; reference line for NTSC (for PAL, position the burst vector
Adjustment Procedures 1780R-Series Service Manual 5–13 1. Equipment Connections a. Connect the television test signal generator Color Bar signal, through a 75 W feed-through terminator, to the 1780R-Series CH A INPUT connector. See Figure 5–6. Figure 5–6: Initial signal connections for re-adjustment...
Page 279 - h. Press the button below the Waveform CRT to On.; Press the CALIBRATE button to exit the menu.; Adjust Power Supplies; Supply
Adjustment Procedures 5–14 1780R-Series Service Manual f. Set the PHASE SHIFT button to Off, the CALIBRATE button to On,and the button below the Vectorscope CRT to On. g. Use the Precision Measurement control to adjust for desired Vectorscope CRT readout intensity. h. Press the button below the Wave...
Page 280 - a. Enter the CONFIGURE menu and go to page 3 of the menu.; Select the menu settings that are appropriate for the instrument:
Adjustment Procedures 1780R-Series Service Manual 5–15 Figure 5–7: Adjustment and test point locations on the Waveform HV Supply circuitboard (Assembly 16.) NOTE . The +5 V supply is the reference supply for the instrument. If it is adjusted, the entire instrument will need to be recalibrated. Do no...
Page 282 - Adjust Vector Astigmatism and Focus; PAGE 1 of the menu displayed on the Vectorscope CRT.; d. Press the button below the Waveform CRT.
Adjustment Procedures 1780R-Series Service Manual 5–17 d. Set the 1780R-Series front-panel SCALE and INTENSITY controls for normal brightness. Figure 5–8: Adjustment locations on the Vectorscope HV Supply circuit board (Assembly A3) 7. Adjust Vector Astigmatism and Focus a. Set the front-panel FOCUS...
Page 283 - g. Press the REFERENCE SET button. Check that the; V readout is 0 mV; h. Select CAL AMPL ZERO SET on the Vectorscope CRT.
Adjustment Procedures 5–18 1780R-Series Service Manual Figure 5–9: Adjustment locations on the Microprocessor circuit board (AssemblyA5) e. Press the CALIBRATE button. Select VOLTAGE CURSORS ZEROSET on the Vectorscope CRT menu. f. Use the VERT POS control to center the nulled cursors on the Waveform...
Page 286 - Adjust Vector CRT Trace Rotation, Orthogonality, and Geometry; the circle surrounds the words TRACE ROTATION.; Align Vector Electronic Graticule; CALIBRATE button is On.
Adjustment Procedures 1780R-Series Service Manual 5–21 11. Adjust Vector CRT Trace Rotation, Orthogonality, and Geometry a. Press the button under the Vectorscope CRT to On. b. Touch the TRACE ROTATION pad on the Waveform CRT. Be sure that the circle surrounds the words TRACE ROTATION. c. Turn the P...
Page 288 - g. Adjust Cal Gain (A2R1137) to null the signals displayed on the test
Adjustment Procedures 1780R-Series Service Manual 5–23 d. Set the VAC for a 999.9 mV output amplitude. Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that thecorrect television standard (NTSC, PAL, or PAL-M) is selected. NOTE . Leave VAC +Lum and Lum/Sync buttons and ...
Page 289 - Adjust CH B1 Input Gain; Check that CH B1 INPUT is selected.; g. Adjust Gain B1 (A8R347) so that the bottom trace of the upper level; Leave the DC RESTORER set to OFF.
Adjustment Procedures 5–24 1780R-Series Service Manual remain lit but not the A-B1 selection.) The display should become anearly flat trace and the left CRT should display the messages: g. If these messages are not displayed, repeat part f. of this step. Move quickly from touching the screen to sele...
Page 290 - Match Input Gains; INPUT to the CH B2 INPUT.
Adjustment Procedures 1780R-Series Service Manual 5–25 Figure 5–13: Input & BNC circuit board (A8) adjustments, shown as they wouldappear with the instrument on its left side 17. Match Input Gains a. Connect the VAC output cable to a dual input coupler. b. Connect one side of the coupler to the ...
Page 295 - g. Set the generator multiburst frequency range to Low.; Connect the leveled sine wave generator output through a 50; m. Connect the peak-to-peak detector head to the other CH A INPUT
Adjustment Procedures 5–30 1780R-Series Service Manual NOTE . Typically, A2R612 is set fully counterclockwise and A2R418 is set fully clockwise. A2R534 is set nearly fully clockwise. f. Set the WAVEFORM GAIN to X5. g. Set the generator multiburst frequency range to Low. h. Adjust Limiter (A2R628) un...
Page 296 - v. Set the generator frequency to 10 MHz and the proper amplitude as; displayed on the Waveform CRT.
Adjustment Procedures 1780R-Series Service Manual 5–31 Figure 5–15: Test equipment connections for adjusting CH A frequency response t. Adjust A2C527 for 100 IRE (700 mV for PAL) signal amplitude on theWaveform CRT. u. Recheck the amplitudes at 3.58 MHz (4.43 MHz for PAL) and 5 MHz. Readjust A2C611 ...
Page 297 - ab. Disconnect the equipment from the 1780R-Series CH A INPUT. Leave; Adjust Input Channel Common Mode Rejection
Adjustment Procedures 5–32 1780R-Series Service Manual NOTE . Repeat parts v. through y. of this step, as necessary, to obtain the frequency response described. z. Adjust the generator frequency and check for a decreased amplitude of1% to 3% at 15 MHz, and 4%to 7% at 20 MHz. If the amplitudes atthes...
Page 298 - Adjust CH B1 Input Frequency Response; termination is connected to the 1780R-Series PIX
Adjustment Procedures 1780R-Series Service Manual 5–33 c. Select the following 1780R-Series settings: INPUT A-B1, WAVEFORMHORIZONTAL-ONE-FIELD, and WAVEFORM GAIN-X5-On. NOTE . Do not turn the CMR adjustments given in parts d., g., and j. of this step if chrominance nulls within 14 IRE for NTSC (100 ...
Page 299 - h. Check that the Waveform CRT display amplitude is 100 IRE (700 mV; Adjust CH B2 Input Frequency Response
Adjustment Procedures 5–34 1780R-Series Service Manual amplitude so the Waveform CRT display is 100 IRE (700 mV for PAL)in amplitude. f. Adjust the peak-to-peak detector amplifier +Level control to turn on thegreen light. Note the DMM reading. g. Set the generator frequency to 10 MHz and adjust the ...
Page 301 - m. Readjust Chroma Gain (A2R828) for a signal amplitude of 100 IRE
Adjustment Procedures 5–36 1780R-Series Service Manual c. Set the leveled sine wave generator output frequency to 3.58 MHz(4.43 MHz for PAL) and its output amplitude to 100 IRE for NTSC(700 mV for PAL). d. Select FILTER-CHROM mode. Check that WFM HORIZONTAL-ONE- LINE is selected. NOTE . In most case...
Page 303 - Adjust Horizontal Timing; a. Check that no signal is applied to the CH A INPUT.; T readout stops changing, Select CURSOR 2 and turn the control knob; h. Select MEASURE and CURSOR 1 on the Waveform CRT. Repeat part
Adjustment Procedures 5–38 1780R-Series Service Manual j. Select the FILTER-FLAT mode. Select COUPLING-DC on theConfigure menu. Press the CONFIGURE button to exit the menu. 32. Adjust Horizontal Timing NOTE . Perform Step 39, Adjust Timing Cursors, before checking and adjusting horizontal timing. a....
Page 304 - o. Adjust X25 Mag (A2R471) so that the CURSOR 1 and CURSOR 2 dots
Adjustment Procedures 1780R-Series Service Manual 5–39 k. Adjust the Precision Measurement control so that the CURSOR 1 and CURSOR 2 dots are exactly 10 divisions apart (The bright-up dotsshould coincide with the 2nd and 12th major graticule marks when the D T readout is exactly 100.000 m s.) NOTE ....
Page 305 - g. Disconnect the Color Bar signal from the CH A INPUT.; Adjust Slow Sweep Trigger Level
Adjustment Procedures 5–40 1780R-Series Service Manual d. Use the HORIZ POS control to position the center of the vertical sync to the mid-screen graticule mark. e. Set the WFM HORIZONTAL-MAGNIFIER to OFF. f. Adjust H Mag Reg (A2R344) to center the vertical sync on the screen. g. Disconnect the Colo...
Page 306 - g. Connect the DMM Volts lead to A7TP251.
Adjustment Procedures 1780R-Series Service Manual 5–41 Variable resistors are shown rotated 90 _ from the way they are mounted on the assembly; variable resistors are adjustable from the top of the circuit board. Figure 5–16: Adjustment and test point (TP) locations for the Oscillator circuit board ...
Page 307 - Adjust Vector Gains; and a Black Burst signal is applied to the; b. Push the button beneath the Vectorscope CRT.; on the Vectorscope CRT.; k. Select the 1780R-Series REF-EXT mode and press the PHASE SHIFT
Adjustment Procedures 5–42 1780R-Series Service Manual m. Adjust DC Balance (A7R286) so that the NTSC demodulated burst pulse overlays the demodulated baseline as displayed on the test oscilloscope.(For PAL, there are two bursts. Adjust the burst that will null.) n. Disconnect the test oscilloscope ...
Page 308 - q. Check that the burst vector(s) can be moved to the compass rose by; adjusting the variable VECTOR GAIN control.; x. Push the CONFIGURE button. Select PAGE 2 and touch the
Adjustment Procedures 1780R-Series Service Manual 5–43 l. Use the variable VECTOR GAIN control to place the burst vector dot(s)to the graticule reference 75% mark(s). If necessary, use the VERT andHORIZ POS controls to center the vector display center dot. m. Remove the 75 W termination from CH A IN...
Page 311 - u. Touch the GO TO DIFF GAIN pad on the Vectorscope CRT. Check that; differential gain display to the graticule baseline.; x. Rotate the Precision Measurement control for a D GAIN readout of; ae. Touch the GO TO DIFF GAIN pad on the Vectorscope CRT. Check that; Press the REFERENCE SET button.
Adjustment Procedures 5–46 1780R-Series Service Manual NOTE . Repeat parts p. through t. of this step, if necessary, for proper deflection. u. Touch the GO TO DIFF GAIN pad on the Vectorscope CRT. Check that SINGLE is selected. Use the variable VECTOR GAIN control toposition the burst vector to the ...
Page 312 - ah. Touch the GO TO DIFF PHASE pad on the Vectorscope CRT. Check; that DOUBLE is selected.; ak. Push the MEASURE button to exit this mode.
Adjustment Procedures 1780R-Series Service Manual 5–47 ah. Touch the GO TO DIFF PHASE pad on the Vectorscope CRT. Check that DOUBLE is selected. ai. Press the button located below the left CRT. Use the VERT and HORIZ POS controls to position the vector center dot to the center of theVectorscope CRT....
Page 313 - Figure 5–18: Noise Reduction-OFF. Demod offset properly adjusted; end-line termination to the remaining CH A INPUT connector.
Adjustment Procedures 5–48 1780R-Series Service Manual Figure 5–18: Noise Reduction-OFF. Demod offset properly adjusted 38. Adjust SCH Phase a. Connect a Color Bar signal from a TEKTRONIX TSG-170A NTSC Television Generator to the 1780R CH A INPUT connector. Connect a75 W end-line termination to the ...
Page 314 - h. Adjust Ref SCH Adj (A2R1263) so the timing of the Ch 2 pulses; m. Connect two more 75
Adjustment Procedures 1780R-Series Service Manual 5–49 –Slope and Normal mode triggering. (For PAL, set the time base to20 m s/Div.) g. Check that the 1780R-Series WFM HORIZONTAL-ONE-LINE (or TWO-LINE) is selected. Press the LINE SELECT button to On. SelectLINE SEL MENU-ON, WFM= VECT-YES, and FIELD ...
Page 315 - w. Leave the Color Bar signal connected to the CH A INPUT. Disconnect
Adjustment Procedures 5–50 1780R-Series Service Manual r. If necessary, move the jumper on A2J986 so the SCH dot is closest tothe burst vector reference line as displayed on the Vectorscope CRT.(That is, close to the 0 _ mark on the graticule d Q scale.) NOTE . The jumper on A2J986 should be left at...
Page 316 - h. Disconnect the 10X probe from the test point.; on the rising edge of the white bar.
Adjustment Procedures 1780R-Series Service Manual 5–51 Figure 5–19: Z-Axis circuit board (A4) adjustment and test point locations e. Disconnect the probe from A4TP108. f. Connect a 10X probe from the test oscilloscope vertical input toA4TP100. Set the test oscilloscope vertical deflection factor to ...
Page 318 - h. Connect the generator –Output to pins 1 and 5 of the XY Input
Adjustment Procedures 1780R-Series Service Manual 5–53 Figure 5–20: Vector graticule x- and y-axis markings for adjusting xy input gains f. Move the generator output connections to pin 5 (–Y) and pin 7 (+Y) onthe XY Input connector. g. Adjust Y Gain (A6R308) so the vertical trace is as long as the v...
Page 319 - Figure 5–21: Properly adjusted xy input gains; connector and this connector is terminated into 75; d. Press the button below the Waveform CRT. Use the 1780R-Series
Adjustment Procedures 5–54 1780R-Series Service Manual Figure 5–21: Properly adjusted xy input gains 42. Adjust RGB/YRGB a. Connect a Color Bar signal from the television test signal generator, through a 75 W feed-through terminator, to the 1780R-Series CH A INPUT. b. Check that a Black Burst signal...
Page 320 - Adjust Dynamic Focus; connected, through a 75; h. Press the button below the Vectorscope CRT.
Adjustment Procedures 1780R-Series Service Manual 5–55 h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 1 kHz, 0 V to+10 V, square waves as displayed on the test oscilloscope CRT. i. Disconnect the function generator ou...
Page 322 - k. Disconnect the Pulse & Bar signal from the CH A INPUT connector.; PROBE input connector.; d. Attenuate the Pulse & Bar signal by inserting a 75; 0X attenuator
Adjustment Procedures 1780R-Series Service Manual 5–57 e. Adjust Probe Calibrator Amplitude (A6R795) to obtain a null on the testoscilloscope CRT display. f. Disconnect the test oscilloscope from the VAC and the 1X probe fromthe 1780R-Series CAL OUT connector. g. Connect a Pulse & Bar signal fro...
Page 324 - p. Check that the displayed amplitude on the Waveform CRT is within; u. Disconnect the 75
Adjustment Procedures 1780R-Series Service Manual 5–59 o. Set the generator output frequency to 3.58 MHz (4.43 MHz for PAL), 5 MHz, 8 MHz, and then to 10 MHz. p. Check that the displayed amplitude on the Waveform CRT is within ± 3% or ± 21.4 mV for NTSC ( ± 21.0 mV for PAL) of the amplitude noted in...
Page 327 - Cleaning or Changing the Fan Filter; A 2% RMA flux content solder is recommended for making repairs in
1780R-Series Service Manual 6–1 Preventive Maintenance Preventive maintenance consists of cleaning, visual inspection, performancechecks, and (if needed) readjustment. The preventive maintenance scheduleestablished for the instrument should be based on the amount of use it receivesand the environmen...
Page 328 - Visual Inspection; Exterior
Preventive Maintenance 6–2 1780R-Series Service Manual The instrument should be cleaned often enough to prevent dust and dirt fromaccumulating. Dirt acts as a thermal insulator, preventing effective heatdissipation, and can also provide high-resistance electrical leakage paths betweenconductors or c...
Page 329 - Static-Sensitive Components; Table 6–1: Static Susceptibility; Relative Susceptibility Levels; Observe the following precautions to avoid damage:; Keep component leads shorted together whenever possible.
1780R-Series Service Manual 6–3 Static-Sensitive Components This instrument contains electrical components that are susceptible to damagefrom static discharge. Static voltages from 1 kV to 30 kV are common inunprotected environments. Table 6–1 shows the relative static dischargesusceptibility of var...
Page 330 - Do not slide components over any surface.; covering capable of generating a static charge.; Use a soldering iron that is connected to earth ground.
Static-Sensitive Components 6–4 1780R-Series Service Manual 7. Do not slide components over any surface. 8. Avoid handling components in areas that have a floor or work surface covering capable of generating a static charge. 9. Use a soldering iron that is connected to earth ground. 10. Use only wic...
Page 331 - Corrective Maintenance; Obtaining Replacement Parts; Instrument Type or Number
1780R-Series Service Manual 6–5 Corrective Maintenance CAUTION. A 2% RMA flux content solder is recommended for making repairs in this instrument. Cleaning of rosin residue is not recommended. Most cleaningsolvents tend to reactivate the rosin and spread it under components where itmay cause corrosi...
Page 332 - Mechanical Disassembly/Assembly; Figure 6–1: Front panel parts; Inner Bezel Frame
Corrective Maintenance 6–6 1780R-Series Service Manual Mechanical Disassembly/Assembly Use these instructions for disassembly and then reverse them for reassembly,unless noted otherwise. The Inner Bezel Frame Removal and Graticule LightRemoval procedures can be performed with the instrument installe...
Page 333 - After replacing the bulb, install the parts that were removed.; Graticule Light Removal
Corrective Maintenance 1780R-Series Service Manual 6–7 Use the following procedure to replace the graticule lights. 1. Remove the SCALE, FOCUS, INTENSITY, VERT POS, and HORIZ POS knobs by loosening their set screws. 2. Use pliers to grip the CRT Panel protrusion where the SCALE control shaft is loca...
Page 334 - Instrument Removal from
Corrective Maintenance 6–8 1780R-Series Service Manual Use the following procedure to remove the instrument from the cabinet or case. 1. Check that the power cord is disconnected. Disconnect all the coaxial cables from the rear-panel BNC connectors. 2. Remove the instrument from the rack mounting ca...
Page 335 - Figure 6–2: Positions of the waveform CRT deflection leads; The CRT may retain a dangerous charge. Ground the conductor of the; Loosen the nuts for the grey CRT base mount.; the CRT forward by pressing on the back of the CRT base mount.
Corrective Maintenance 1780R-Series Service Manual 6–9 Figure 6–2: Positions of the waveform CRT deflection leads 6. For the CRT being removed: Disconnect the appropriate Trace Rotation connector from the Interconnect board (A11). For the waveform CRT, theconnector is J165; for the vectorscope CRT, ...
Page 336 - WAVEFORM CRT ONLY Reconnect all the deflection leads to the CRT.; Reconnect the anode lead to the in-line connector.; CRT Replacement
Corrective Maintenance 6–10 1780R-Series Service Manual Use the following procedure to replace the CRT. 1. Slide the CRT partially into position so the CRT base pins will align with the socket. Push the socket into position onto the CRT pins. CAUTION. Avoid bending the CRT base pins when pushing the...
Page 337 - Clean the face of the CRT to remove fingerprints.; Use the following procedure to remove the Input & BNC board.; Remove the two screws that hold the clear plastic cover in place.; BNC Board
Corrective Maintenance 1780R-Series Service Manual 6–11 6. Clean the face of the CRT to remove fingerprints. 7. Reconnect the PROBE connector to J498 on the Vectorscope board (A6). Install the parts removed in steps 1 through 4 of the CRT Removal proce-dure. Reconnect the ribbon cable connector to J...
Page 338 - Remove the six screws to remove the board.; Use the following procedure to remove the Microprocessor board.; Remove the four nuts that hold the REMOTE and SERIAL PORT connec-; tors to the rear panel.; Remove the eight screws from the circuit board.; Perform Step 3 of the Adjustment Procedure.; Remove the four screws to release the board for removal.
Corrective Maintenance 6–12 1780R-Series Service Manual Use the following procedure to remove the Waveform HV Supply board. 1. Remove the two screws that hold the clear plastic cover in position. 2. Remove the two 1/4-inch hex-shaped posts. WARNING. The CRT may retain a dangerous charge. Ground the ...
Page 339 - Disconnect three small connectors from J389, J498, and J574 on the; Removing the LV Power
Corrective Maintenance 1780R-Series Service Manual 6–13 Use the following procedure to remove the LV Power Supply board. 1. Remove the MPU Annex (A10), Waveform HV Supply (A16), and the Fuse (A17) boards using the procedures given previously. 2. Remove the screws and one nut that hold the large and ...
Page 340 - Disconnect the ribbon cable connector from J115 on the board.; Use the following procedure to remove the Z-Axis board.; Removing the Oscillator
Corrective Maintenance 6–14 1780R-Series Service Manual 7. To re-assemble, reverse the procedure. Use the following procedure to remove the Oscillator board. 1. Unsolder the ground and center conductor wires from the EXT CW REF rear-panel BNC connector. 2. Unplug the coaxial cable connector from J49...
Page 341 - Troubleshooting; Troubleshooting Aids; Figure 6–4: Using foldout pages; Foldout Pages
1780R-Series Service Manual 6–15 Troubleshooting Since this manual is a troubleshooting aid, its organization is described here.This material is general, and does not cover specific cases. Troubleshooting Aids The foldout pages at the back of the manual contain block and schematicdiagrams, circuit b...
Page 342 - Circuit Number; Replaceable Mechanical Parts List and Exploded View Drawing.; Parts Lists
Troubleshooting 6–16 1780R-Series Service Manual Look Up Charts. Each schematic diagram is assigned an alpha-numeric grid and a look-up chart which lists the grid location of components on that schematic. Circuit Board Illustrations. Electrical components, connectors, and test points are identified ...
Page 343 - Assembly and Circuit Numbering.; All circuit board assemblies are assigned; Table 6–3: Circuit Board Assemblies; Assembly Number
Troubleshooting 1780R-Series Service Manual 6–17 Assembly and Circuit Numbering. All circuit board assemblies are assigned assembly or “A” numbers. Table 6–3 and Figure 6–5 show the assemblynumbers and their locations for this instrument. NOTE . Always check the parts list for part numbers and descr...
Page 344 - Figure 6–5: 1780R-Series circuit board assembly locations
Troubleshooting 6–18 1780R-Series Service Manual Figure 6–5: 1780R-Series circuit board assembly locations
Page 345 - General Troubleshooting Techniques; to signal tracing and circuit isolation.
Troubleshooting 1780R-Series Service Manual 6–19 General Troubleshooting Techniques 1. Be sure the instrument is malfunctioning. See Section 2 to determine whether the instrument is operating properly. Check the operation offront-panel controls, associated equipment, and input signal connections. CA...
Page 347 - Troubleshooting Procedures; Board Accessibility; previously in this section of the manual.; Z Axis and Oscillator
1780R-Series Service Manual 6–21 Troubleshooting Procedures Board Accessibility Servicing some circuit assemblies in this instrument requires removal of othercomponents (shields, cables, circuit boards, etc.). Some procedures call outspecial equipment such as cable extenders or external power suppli...
Page 348 - Power Supply; Do not attempt to troubleshoot the 1780R-Series power supply
Troubleshooting Procedures 6–22 1780R-Series Service Manual WARNING. Dangerous potentials exist on the LV Power Supply board. Use care when troubleshooting to prevent personal injury. Read the instructions given inthe Troubleshooting portion of this section. Power Supply The 1780R-Series power suppl...
Page 349 - Turning off the 1780R-Series Power switch does not remove mains; Figure 6–6: Connections for the external power supply leads; along with the external power supply common lead.; Equipment Required List
Troubleshooting Procedures 1780R-Series Service Manual 6–23 DC Power Supply: Variable voltage supply, 0–20 V DC at 1A. For example: A TEKTRONIX PS 503A Power Supply.(Requires a TM500-Series mainframe.) Isolation Transformer: For example: Stancor GIS 1000. Test Oscilloscope: See Equipment Required Li...
Page 350 - Short across VR570 to disable the Low Line Lockout circuit.
Troubleshooting Procedures 6–24 1780R-Series Service Manual 5. Slowly increase DC power supply voltage. At about 16 V U460 turns on and the base of the Switcher (Q250) has a waveform with a 90% duty cycle, 5 Vpeak-to-peak amplitude (+1 V to –4 V), and a 20 m s period. 6. Slowly decrease the DC power...
Page 354 - Generator, through a 75
Troubleshooting Procedures 6–28 1780R-Series Service Manual Figure 6–9: +5 V supply output waveform when over voltage protection is operating Current Limit Adjustment (A1R466) Variable Auto Transformer: See Equipment Required List in the Adjustment Proceduressection. Television Test Signal Genera-to...
Page 356 - Touch Panel Sensitivity Adjustment (A9R292); Check that the 1780R-Series instrument POWER switch is set to OFF; Disconnect the 10X probe from the MPU Annex board.; CRT Frame Outer Bezel to the Front Frame Section.; Install the CRT panel and control knobs.
Troubleshooting Procedures 6–30 1780R-Series Service Manual Touch Panel Sensitivity Adjustment (A9R292) Test Oscilloscope: See Equipment Required List for the Performance Verificationor Adjustment Procedures. 1. Check that the 1780R-Series instrument POWER switch is set to OFF (STANDBY). 2. Remove t...
Page 361 - Replaceable Electrical Parts; Parts Ordering Information
1780R-Series Service Manual 8–1 Replaceable Electrical Parts This section contains a list of the electrical components for the <instrument>.Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix field offic...
Page 362 - Parts list column descriptions; Column; A2
Replaceable Electrical Parts 8–2 1780R-Series Service Manual Parts list column descriptions Column Column name Description 1 Component number The component number appears on diagrams and circuit board illustrations, located in the diagramssection. Assembly numbers are clearly marked on each diagram ...
Page 363 - Manufacturers cross index; Manufacturer
Replaceable Electrical Parts 1780R-Series Service Manual 8–3 Manufacturers cross index Mfr.code Manufacturer Address City, state, zip code 00779 AMP INC. CUSTOMER SERVICE DEPTPO BOX 3608 HARRISBURG, PA 17105–3608 01295 TEXAS INSTRUMENTS INC SEMICONDUCTOR GROUP13500 N CENTRAL EXPRESSWAYPO BOX 655303 ...
Page 364 - Address
Replaceable Electrical Parts 8–4 1780R-Series Service Manual Manufacturers cross index (cont.) Mfr.code City, state, zip code Address Manufacturer 12954 MICROSEMI CORP – SCOTTSDALE 8700 E THOMAS ROADPO BOX 1390 SCOTTSDALE, AZ 85252–5252 12969 MICROSEMI CORP WATERTOWN DIVISION530 PLEASANT STREET WATE...
Page 368 - Replaceable electrical parts list
Replaceable Electrical Parts 8–8 1780R-Series Service Manual Replaceable electrical parts list Componentnumber Tektronixpart number Serial no.effective Serial no.discont’d Name & description Mfr. code Mfr. part number A1 671–0460–12 CIRCUIT BD ASSY:LOW VOLTAGE 80009 671–0460–12 A2 671–0467–18 B0...
Page 527 - Diagrams and Circuit Board Illustrations; Symbols
Diagrams and Circuit Board Illustrations This section contains the troubleshooting procedures, block diagrams, circuit boardillustrations, component locator tables, waveform illustrations, and schematic diagrams. Symbols Graphic symbols and class designation letters are based on ANSI Standard Y32.2-...
Page 538 - A8 Input and BNC Board <2> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C150 B2 C173 B5 C255 D1 C266 B2 C268 B3 C269 G1 C270 B3 C278 D4 C289 B4 C291 B3 C292 B3 C293 G4 C354 D1 C360 D1 C367 F1 C379 D3 C383 D4 C390 F4 C459 E2 C460 F2 C472 B3 C482 E5 C483 F5 C495 B3 C559 F2 C564 G2 C565 G2 C566 F2 C571 B3 C583 F5 C588 G4 C589 G4 C590 F4 C595 B...
Page 550 - A2 Waveform Board <7> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C1003 B1 C1011 E4 C1016 F4 C1019 H4 C1117 E4 C1414 C1 C1415 C2 C1517 B5 C713 C4 C812 C4 C817 C4 C913 F5 CR1011 G4 CR1111 G4 CR1304 B5 CR1312 C1 CR1313 C1 CR1405 B5 CR912 E4 CR913 D4 J1103 H1 J1406 D5 J9 H1 P1103 H1 Q1304 B5 Q1415 C1 R1005 G4 R1006 G4 R1007 D4 R1008 D4 R...
Page 556 - A2 Waveform Board <10> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C394 E3 C485 E4 C587 E2 C593 F2 C690 E2 C693 F4 C786 D1 C793 C4 C795 B5 CR485 E2 CR488 E2 CR590 F2 CR592 F4 CR775 D1 CR777 D2 CR778 D1 CR795 B4 J585 G3 J694 B4 P585 G3 P694 B4 Q361 C3 Q386 E4 Q589 E2 Q686 F4 R363 D3 R387 E4 R388 D4 R394 D4 R463 C3 R485 F3 R486 F3 R487 E...
Page 560 - A2 Waveform Board <12> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C248 G1 C250 G1 C252 G2 C707 H4 C708 H4 C710 H3 C711 G3 C808 H3 C810 H3 C906 H2 C907 H5 C908 H4 J130 A1 J147 A3 R231 E2 R232 E2 R255 G2 R256 G2 R710 G3 R808 G3 U207 C3 U217 D2 U220 D1 U231 E1 U245A G2 U245B G1 U245C G1 U251B G1 U251C G2 U251D G1 U274 D4 U275 D5 U605A H4...
Page 562 - A2 Waveform Board <13> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C758 E5 CR1060 F4 CR1061 F4 CR1141 E4 CR1142 D4 CR1150 D3 CR1151 E3 CR1365 F3 CR1366 F3 CR1588 B4 CR1593 B4 CR1597 B3 CR358 F2 CR359 G2 CR458 E2 CR459 E2 CR462 D2 CR463 E2 CR559 D2 CR658 D1 CR659 E1 L157 E5 L758 E5 Q1586 G4 Q658 D1 R1577 G5 R1578 G5 R1583 G3 R1584 G4 R1...
Page 564 - A2 Waveform Board <14> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C875 B3 C969 D2 J1081 E2 J1085 F3 J870 C2 P1081 E2 P1085 F3 Q969 D2 Q970 D2 R1070 D2 R1085 F3 R872 B4 R968 C2 R969 D2 R970 D2 R985 E2 TP981 F3 U975A B3 U975B B4 U977 C3 U980 E3 U985A F2 U985B G2 A2 Waveform Board <14> Component Locator A2 Waveform Board <14>...
Page 566 - A2 Waveform Board <15> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C991 G1 C1086 E3 C1090 G1 C1091 E3 C1093 H1 C1094 E3 C1194 E3 C1195 C3 C1284 C4 C1287 D3 C1288 D3 C1291 D3 C1347 B2 C1351 E2 C1364 G3 C1386 B3 C1390 B3 C1391 B4 C1394 D5 C1395 E4 C1397 C5 C1490 H1 C1497 H1 C1550 B1 C1553 D2 C1554 D1 C1555 D2 C1560 D1 C1561 D1 C1563 D1 C...
Page 568 - A5 Microprocessor Board <16> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C135 G3 C137 H3 C140 H3 C142 G4 C145 H4 C240 H4 C335 G4 C336 H4 C342 H4 C344 G4 C433 B3 C434 B2 C440 H4 C445 H4 C450 G4 C534 H4 C540 A5 C541 A5 J342 B4 J344 A5 R355 E1 R360 E3 R430 A5 R431 B5 R435 B3 R436 B2 U120A E2 U120B E2 U135 G2 U137 G1 U140 G3 U142 G4 U145 G3 U340...
Page 572 - A5 Microprocessor Board <18> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C177 H4 C185 H4 C187 H4 C264 C2 C265 C2 C285 H4 C455 E5 C476 H4 C480 H4 R370 G1 R455 E4 U165 F3 U167 B3 U367 D1 U375 E1 U453A E5 U453B D5 U475 G1 U476 F1 W475 D1 Y264 D2 A5 Microprocessor Board <18> Component Locator A5 Microprocessor Board <18> Component Lo...
Page 578 - A5 Microprocessor Board <21> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C105 A3 C205 A3 J115 D2 J415 F1 J515 H1 R105 B1 R111 C1 R112 C1 R113 C1 R114 C1 R115 C2 R116 C2 R117 C2 R118 C2 R305 B2 R402 C4 R403 C5 R404 C4 R405 C3 R406 C3 R407 C3 R408 C4 R502 C5 R503 C4 R504 C4 R505 C3 R506 C4 R507 C3 R508 C3 R509 C3 U101 B4 U105 B1 U305 B3 A5 Mic...
Page 580 - A10 Microprocessor Annex Board <22> Component Locator
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE SCHEM LOCATION CIRCUIT NUMBER C207 C3 C211 C3 C230 D3 C329 D3 C525 D5 C534 D5 CR106 G1 CR107 G1 CR108 G1 CR109 G1 CR110 G1 CR111 G1 CR112 G2 CR113 G2 J112 H1 J138 H3 J302 A1 R208 E2 R209 E2 R210 E2 R211 E2 R212 E2 R213 E2 R214 E3 R215 E3 R221 D3 R305 ...
Page 582 - A12 Front Switch Panel Board <23> Component Locator
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE SCHEM LOCATION CIRCUIT NUMBER DS104 E1 DS106 E2 DS114 F1 DS116 F2 DS124 G1 DS126 G1 DS134 H1 DS136 H1 DS204 E3 DS206 E3 DS214 F2 DS215 F3 DS216 F3 DS224 G2 DS225 G3 DS226 G3 DS234 H2 DS235 H3 DS236 H3 DS304 E3 DS305 E4 DS306 E4 DS314 F3 DS315 F4 DS316...
Page 584 - A3 Touch Front Panel Board <24> Component Locator
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE SCHEM LOCATION CIRCUIT NUMBER C105 C1 C288 F1 C292 F1 C296 G1 C297 F1 C298 G1 C396 A2 C397 B2 C398 A2 C399 A2 C443 E3 C483 E5 C490 A2 C498 B2 CR291 G1 CR297 G1 DS106 C1 DS146 C3 DS206 C2 DS246 C4 DS306 C2 DS346 C4 DS406 C2 DS413 C2 DS420 C2 DS428 D2 D...
Page 586 - A6 Vectorscope Board
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE A6 Vectorscope Board
Page 588 - A6 Vectorscope Waveforms and J885 Connections
Page 600 - A7 Oscillator Board
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE A7 Oscillator Board
Page 602 - A7 Oscillator Board Waveforms
Page 610 - A15 Filter Board
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE A15 Filter Board
Page 611 - A15 Filter Board <35> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C100 H3C110 G2C111 H2C130 A1C140 A1C141 A1C150 B1C151 B1C160 A1C161 A1C170 A1C171 A1C180 A1C181 B1C210 G2C211 G2C212 G1C220 G1C300 G3C310 H3C311 H1C312 H1C320 H1C321 H2C322 A1C350 B1C400 B1C410 A1C411 G4C420 G4C430 A1C440 A1C441 A1C450 B1C460 A2C461 A2 C470 A2 CR300 G3C...
Page 612 - A15 Filter Board Waveforms and J310 Connections
Page 614 - A4 Z–Axis Board
A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE A4 Z–Axis Board
Page 616 - A4 Z–Axis Board Waveforms
Page 620 - A4 Z–Axis Board <38> Component Locator and J180 Connections
SCHEM LOCATION CIRCUIT NUMBER C133 D5 C136 E5 C139 E5 C143 E5 C217 F4 C220 E5 C223 F5 C320 F5 C323 F5 C327 G5 C329 G5 C333 F5 C336 G5 C339 G5 J156 A1 J180 A1 R217 F4 U218B F4 U223A D5 U223B G3 U233 D4 U236 D2 U239 D3 U243 D1 U329 C4 U333 E2 U336 E3 U339 E4 U420A G4 U423 G4 U426 G1 U429A F1 U429B G3 ...
Page 624 - A4 Z–Axis Board Board <40> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C226 A5 C263 G1 C267 G2 C269 G3 C272 G4 C361 A4 C364 F1 C366 F2 C369 F3 C372 F4 C463 A5 C469 A5 C476 D2 C478 A5 C566 A5 C571 B5 C578 B5 CR466 F1 CR467 F2 CR472 F3 CR473 F3 L261 A4 Q362 G1 Q363 G1 Q365 G2 Q366 G2 Q369 G3 Q370 G3 Q371 G4 Q372 G3 Q374 F5 Q375 F5 Q377 D5 Q3...
Page 626 - A3 Vector High Volts Board <41> Component Locator
SCHEM LOCATION CIRCUIT NUMBER C100 C3 C101 F3 C102 F3 C110 C2 C111 B3 C112 B2 C120 B2 C130 A3 C200 F4 C210 C4 C211 B3 C230 B1 C260 D1 C261 C2 C262 D2 C263 E2 C264 D2 C280 E2 C300 B5 C311 C4 C320 A3 C321 B3 C350 D3 C351 C3 C352 C3 C370 D3 C380 E4 C410 C4 C411 B4 C460 D2 C480 E5 CR120 A3 CR150 C1 CR15...
Page 632 - A11 Interconnect Board <44> Component Locator
SCHEM LOCATION CIRCUIT NUMBER J303 E1 J308 D1 J516 H1 J531 A1 J547 A3 J565 H3 A11 Interconnect Board <44> Component Locator A23 A2 R1234 # " !$ COMPONENT NUMBER EXAMPLE A11 Interconnect Board <44> Component Locator
Page 634 - A11 Interconnect Board <45> Component Locator
SCHEM LOCATION CIRCUIT NUMBER A11 J116 D1 J133 D4 J143 D3 J150 D2 J165 D4 J492 A1 J497 H1 S100 F5 A13 DS111 E2 DS121 E1 DS131 E2 DS141 E1 DS151 E2 P116 D1 S131 E1 A14 DS110 E3 DS120 E3 DS130 E3 DS140 E3 DS150 E4 P150 D2 S130 E3 A11 Interconnect Board <45> Component Locator A23 A2 R1234 # "...
Page 636 - A11 Interconnect Board <46> Component Locator
SCHEM LOCATION CIRCUIT NUMBER J375 A1 J380 H1 R109 E2 R123 E3 R127 E3 R138 E4 R158 E4 R185 D4 R191 D4 R198 D3 A11 Interconnect Board <46> Component Locator A11 Interconnect Board <46> Component Locator
Page 639 - Mechanical Parts List; Part number
1780R-Series Service Manual 10–1 Mechanical Parts List This section contains a list of the replaceable mechanical components for thisinstrument. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix, Inc., Field...
Page 640 - Using the Replaceable Mechanical Parts List; Table 10–1 describes each column in the replaceable parts list.; Table 10–1: Replaceable parts list column descriptions; Column Name; Cross Index–Mfr. Code
Mechanical Parts List 10–2 1780R-Series Service Manual Using the Replaceable Mechanical Parts List Table 10–1 describes each column in the replaceable parts list. Table 10–1: Replaceable parts list column descriptions Column Name Description Fig. & Index Number Items in this column are reference...
Page 641 - Manufacturers Cross Index
Mechanical Parts List 1780R-Series Service Manual 10–3 Manufacturers Cross Index Mfr.Code Manufacturer Address City, State, Zip Code 06383 PANDUIT CORP 17301 RIDGELAND TINLEY PARK IL 07094–2917 07416 NELSON NAME PLATE CO 3191 CASITAS 0KB01 STAUFFER SUPPLY CO 810 SE SHERMAN PORTLAND, OR 97214–4657 12...
Page 642 - Replaceable Parts List
Mechanical Parts List 10–4 1780R-Series Service Manual Replaceable Parts List Fig. &IndexNumber TektronixPart Number Serial No.Effective Serial No.Discont’d Qty Name & Description Mfr. Code Mfr. Part Number 1–1 426–2293–00 2 FRAME,CRT:ASSY,INNER BEZEL/IR FILTER 80009 426–2293–00 –2 378–0332–...
Page 651 - 780R–Series Figure 1 Exploded View
Page 652 - 780R–Series Figure 2 Cabinet & Accessories
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