Tektronix 070-5992-05

Theory of Operation

6–12 760A / 760D / 760N

Contents

Main Page WARRANTY Page Table of Contents Introduction and Specifications Operating Instructions Installation Contents Maintenance Performance Check and Calibration Section 5 Performance Check and Calibration Procedures 51. . . . . . . . . . . . Theory of Operation Section 6 Theory of Operation 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Options Replaceable Electrical Parts Section 8 Replaceable Electrical Parts Diagrams and Circuit Board Illustrations Section 9 Diagrams/Circuit Board Illustrations List of Figures List of Tables Page General Safety Summary To Avoid Fire or Personal Injury Symbols and Terms Page Service Safety Summary Page Preface Features Service Part Operators Part Contacting Tektronix Page Page Section 1 Introduction and Specifications Introduction CRT Display Features Bar Graph Dynamic response characteristics for peak program meters Return Time Rear Panel Safety Standards 14 760A / 760D / 760N Specifications 760A / 760D / 760N 15 Table 13: Electrical Characteristics (Cont.) 760A 760D 760N 16 760A / 760D / 760N Table 14: Environmental Limits Table 15: Physical Characteristics 760A / 760D / 760N 17 Table 16: Certifications and Compliances Page Page Page Section 2 Operating Instructions Introduction FrontPanel Controls RearPanel Connectors AUDIO INPUTS ! CRT Display Display Orientation Graticule LED BARS Using The 760A / 760D / 760N Initial Alignment Level Setups System Phase Error Measurements Energy Distribution Monaural Compatibility Polarity Reversal Clipping Page Page Page Page Section 3 Installation Electrical Installation Unpacking Power Source Mains Frequency and Voltage Ranges Changing Input Sensitivity (Standard 760A only) UserDefinable Input Sensitivity (Standard 760A only) Changing Input Termination Changing Display Orientation Installation 760A / 760D / 760N 33 Figure 31: 760A / 760D / 760N jumper locations for input and display orientation selections FRONT ASSEMBLY A3 MAIN BOARD Page Page Page Section 4 Maintenance Preventive Maintenance Cleaning CORRECTIVE MAINTENANCE Page Page TROUBLESHOOTING INFORMATION Obtaining Replacement Parts DAC Servicing PAL Signal Specification Power Supply Troubleshooting Procedure Low Volts Supply Page High Volts Supply Page Page MECHANICAL DISASSEMBLY AND ASSEMBLY Bezel Removal Graticule Light Removal and Replacement Removal of the CRT Replacing the CRT Rear Panel Removal and Front Panel Assembly Removal and Page Power Supply Board Removal and REPACKAGING Page Page Page Page Section 5 Performance Check and Calibration Procedures Required Test Equipment Performance Check and Calibration Procedures 52 760A / 760D / 760N Performance Check Procedure Figure 51: Jumper (top) and adjustment (bottom) locations on the A3 Main board J657 FRONT LEGEND Page Page Page Page Page Page Page This concludes the 760A / 760D / 760N Performance Check Procedure Calibration Procedure CAUTION MAINS VOLTAGE Page Page This concludes the 760A / 760D / 760N Calibration Procedure Page Page Page Section 6 Theory of Operation INTRODUCTION INPUT AMPLIFIERS <1> BLOCK DIAGRAM DETAILED CIRCUIT DESCRIPTIONS MATRIX & AGC CONTROL LOGIC <4> AGC & CRT DEFLECTION AMPLIFIERS <5> LEVEL INDICATORS GRAPH DRIVERS <2> Dynamic Response Control (Left) Signal Peak Processor (Left) Bar Anode Driver (Left) Peak Hold On/Off Page Line Rectifier and Filter Pulse Width Modulator Output Filters Error Amplifier Feedback Transformer Driver and Peak Detector Output Under-Voltage Shutdown HIGH VOLTAGE POWER SUPPLY <7> HV Osc and Error Amp Power Supply Outputs Focus Amplifier Grid Drive Circuit Z-Axis Amplifier Theory of Operation CRT 760A / 760D / 760N 611 Figure 63: Pinout of the CRT Socket Page Page Page Section 7 Options OPTIONS CRT Options Power Cord Options Page Page Page Section 8 Replaceable Electrical Parts Parts Ordering Information Using the Replaceable Electrical Parts List Abbreviations Component Number List of Assemblies Chassis Parts Mfr. Code to Manufacturer Cross Index 760A / 760D / 760N 83 Manufacturers Cross Index Code Manufacturer Address City, State, Zip Code 84 760A / 760D / 760N Manufacturers Cross Index (Cont.) Code City, State, Zip CodeAddressManufacturer 760A / 760D / 760N 85 Manufacturers Cross Index (Cont.) Code City, State, Zip CodeAddressManufacturer 86 760A / 760D / 760N Replaceable Electrical Parts List Number Tektronix Part Number Serial no. effective Serial No. 760A / 760D / 760N 87 88 760A / 760D / 760N 760A / 760D / 760N 89 810 760A / 760D / 760N 760A / 760D / 760N 811 812 760A / 760D / 760N 760A / 760D / 760N 813 814 760A / 760D / 760N 760A / 760D / 760N 815 816 760A / 760D / 760N 760A / 760D / 760N 817 818 760A / 760D / 760N 760A / 760D / 760N 819 820 760A / 760D / 760N 760A / 760D / 760N 821 822 760A / 760D / 760N 760A / 760D / 760N 823 824 760A / 760D / 760N 760A / 760D / 760N 825 826 760A / 760D / 760N 760A / 760D / 760N 827 828 760A / 760D / 760N 760A / 760D / 760N 829 830 760A / 760D / 760N 760A / 760D / 760N 831 832 760A / 760D / 760N Page Page Section 9 Diagrams/Circuit Board Illustrations Symbols Component Values Diagrams/Circuit Board Illustrations 92 760A / 760D / 760N Assembly Numbers Component Number Schematic Circuit Number Grid Coordinates BASE DRIVE INSTRUMENT NAME A3 Main Board Diagram Component Locator Assembly A3 Schematic Diagram <1> Component Locator Chart A3 Main Board LEFT VOLTAGE REGULATORS AND DECOUPLING !#! RIGHT AUX Schematic Diagram <2> Component Locator Chart Assembly A3 LEFT BAR ANODE DRIVER PEAK PROCESSOR RIGHT BAR ANODE DRIVER LEFT SIGNAL LEFT DYNAMIC RESPONSE CONTROL (PPM) Schematic Diagram <3> Component Locator Chart Assembly A3. AUX BAR ANODE DRIVER AUX SIGNAL PEAK PROCESSOR DOWN COUNTER AUX DYNAMIC RESPONSE CONTROL (PPM) MASTER CLOCK Schematic Diagram <4> Component Locator Chart Assembly A3. 45 DEGREE MATRIX ORTHOGONALITY CORRECTION GAIN CONTROL LOGIC AUX BAR SELECT TRACE ROTATION Schematic Diagram <5> Component Locator Chart Assembly A1. VERTICAL OUTPUT AMPLIFIER LOW PASS FILTER HORIZONTAL OUTPUT AMPLIFIER VERTICAL GAIN CONTROL GRATICULE ILLUMINATION A1 Power Supply Board A1 Board and Diagram <6> Component Locator 760A/760D/760N STEREO AUDIO MONITOR LOW VOLTS POWER SUPPLY 6 CAUTION: ALL CIRCUITRY TO THE 1 PART OF A1 POWER SUPPLY BOUNDARY A10 CRT Socket Board (Front of Board) A10 CRT Socket Board (Back of Board) 760A/760D/760N STEREO AUDIO MONITOR HIGH VOLTS POWER SUPPLY 7 HV OSC & ERROR AMP PART OF A1 POWER SUPPLY HORIZ PLATE (x2) (g1) GRID Schematic Diagram <8> Component Locator Chart Assembly A2. A2 Front Panel Board ! FRONT PANEL Page Page Page Section 10 Replaceable Mechanical Parts Parts Ordering Information Using the Replaceable Mechanical Parts List Abbreviations Chassis Parts Mfr. Code to Manufacturer Cross Index 760A / 760D / 760N 103 Manufacturers Cross Index Code Manufacturer Address City, State, Zip Code 104 760A / 760D / 760N Replaceable mechanical parts list yName & Description Mfr. Discontd Qt Effective Serial No. 760A / 760D / 760N 105 Replaceable mechanical parts list (Cont.) 106 760A / 760D / 760N Replaceable mechanical parts list (Cont.) 760A/760D/760N A1 A3 A2 A10