Tektronix 070-8030-01

Theory of Operation

3–118 1780R-Series Service Manual

Contents

Main Page Service Assurance Service Assurance Advantages For Information and Ordering Page WARRANTY Page 1780R-Series Service Manual i Table of Contents Specifications Operating Information Table of Contents ii 1780R-Series Service Manual Theory of Operation Performance Verification Table of Contents 1780R-Series Service Manual iii Adjustment Procedures Maintenance Preventive Maintenance 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting Procedures 621. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page List of Figures Page Page List of Tables Page Page General Safety Summary To Avoid Fire or Personal Injury Symbols and Terms Service Safety Summary Page Preface Page Page Product Description CRT Options Power Cord Options Specifications Performance Qualification Heat Dissipation 14 1780R-Series Service Manual Table 11: Input/Output 1780R-Series Service Manual 15 Table 12: Waveform Monitor Vertical System 16 1780R-Series Service Manual Table 12: Waveform Monitor Vertical System (Cont.) 1780R-Series Service Manual 17 Table 12: Waveform Monitor Vertical System (Cont.) 18 1780R-Series Service Manual Table 13: Waveform Monitor Probe Input Table 14: Waveform Monitor Horizontal Deflection System 1780R-Series Service Manual 19 Table 14: Waveform Monitor Horizontal Deflection System (Cont.) 110 1780R-Series Service Manual Table 14: Waveform Monitor Horizontal Deflection System (Cont.) 1780R-Series Service Manual 111 Table 15: Waveform Monitor dG and dP Display 112 1780R-Series Service Manual Table 16: Synchronization 1780R-Series Service Manual 113 Table 16: Synchronization (Cont.) Table 17: Vectorscope Vector Display 114 1780R-Series Service Manual Table 17: Vectorscope Vector Display (Cont.) 1780R-Series Service Manual 115 Table 17: Vectorscope Vector Display (Cont.) Table 18: Vectorscope X-Y Display Table 19: Vectorscope SCH Phase Display 116 1780R-Series Service Manual Table 19: Vectorscope SCH Phase Display (Cont.) Table 110: CRTs and High Voltage Supplies Table 111: Power Requirements 1780R-Series Service Manual 117 Table 111: Power Requirements (Cont.) Table 112: Environmental Summary Table 113: Physical Characteristics 118 1780R-Series Service Manual Table 114: Certifications and Compliances Page Installation Overview Packaging Accessories Rear Panel Connectors Page Installation Requirements Electrical Installation Power Source Mains Frequency and Voltage Ranges Operating Options Installation 26 1780R-Series Service Manual Table 23: Plug Jumpers for Waveform Board (Assembly A2) (Schematic Diagrams 3 through 15) Installation 1780R-Series Service Manual 27 Table 25: Plug Jumpers for Vectorscope Board (Assembly A6) and Oscillator Board (Assembly A7) Floating Video Input Connectors REMOTE Connector Remote Operation SERIAL Interface Connector Serial Remote Information 25-Pin to 9-Pin RS232D Adapter Command Set XY INPUT Connector Mechanical Installation Rack Mounting The 1780R-Series Rack Installation Page Page Initial Calibration Portable Case Installation Calibration Menu Waveform Calibration Page Page Vectorscope Calibration Page Page Repackaging Identification Tag Repackaging for Shipment Page Page Operating Information Front-panel Controls Display Controls Special Purpose Switches Precision Measurement Controls Page Functional Measurement Controls Left Display Right Display Input REF Filter WFM Horizontal Magnifier Gain: Vector Gain: Waveform Page Page Theory of Operation Block Diagrams Schematic Diagrams Block Diagram 4 Microprocessor Block Diagram 5 Z-axis 1780R-Series Service Manual 33 Table 31: Schematics and Circuit Board Assemblies 34 1780R-Series Service Manual Table 31: Schematics and Circuit Board Assemblies (Cont.) Diagrams 1 & 2 Input Amplifiers Page Diagram 3 Probe Input and DC Restorer Page Page Diagram 4 Input & Reference Selection Page Diagram 5 Difference Amplifier & Video Filters Page Page Diagram 6 Vertical Deflection Page Diagram 7 Vertical Control Logic, Calibrator, & Cursors 318 1780R-Series Service Manual Table 32: Input Channel Selection Logic Page Page Diagram 8 Reference Sync Generation Page Page Diagram 9 H & V Sync Generators Page Page Page Diagram 10 Ramp Generator Page Page Page Diagram 11 Horizontal Magnifier & Output Amplifiers Page Page Diagram 12 Horizontal Latches & DAC Page Diagram 13 Slow Sweep & Ext Horiz Input Page Diagrams 14 & 15 SCH Phase Timing & Sync Locked Oscillator (Diagram 15) Page (Diagram 14) Page Diagrams 16 & 17 Master MPU, ROM & NVRAM Page Diagram 17 Dynamic RAM Page Page Diagram 18 Line Rate Controller Page Page Page Page Diagram 19 UART & A/D Page Page Diagram 20 Readout Engine & Read Output Page Page Diagram 21 Interconnect Page Diagrams 22, 23, & 24 MPU Annex, Front Switch Panel, & Touch Panel Page Page Diagram 25 Vectorscope Input & Gain Page Diagram 26 Diff Phase/Gain Page Page Diagram 27 Vector Timing & Blanking Page Page Diagram 28 Demodulators Page Diagram 29 XY Inputs & PIX Monitor Page Diagram 30 Vector Deflection Amps Page Page Diagram 31 Subcarrier Regenerator Page Page Page Diagram 32 Digital Phase Shifter Page Page Diagram 33 Horizontal AFC & Post Regulators Page Diagram 34 Diff Gain/Phase Alt Mode Switch Page Diagram 35 Digital Recursive Filter Page Page Page Diagram 36 Z-Axis Page Diagrams 37 & 38 Timing Cursors & Counters Page Page Page Page Diagram 39 CRT Display DAC Page Diagrams 40 & 45 Scale Illum & Trace Rotation Graticule Lights Page Page Diagram 41 Vector High Volts Page Page Diagram 42 Waveform High Volts Page Page Diagram 43 Low Voltage Power Supply Page Page Page Page Page Page 1780R-Series Service Manual 41 Performance Verification Recommended Equipment List Performance Verification 42 1780R-Series Service Manual Table 41: Recommended Equipment (Cont.) Performance Verification 1780R-Series Service Manual 43 Table 41: Recommended Equipment (Cont.) Page Page Page Short Form Procedure Page Page Performance Check Procedure Preliminary Setup Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Adjustment Procedures General Information Page Page 54 1780R-Series Service Manual Recommended Equipment List Table 51: Recommended Equipment 1780R-Series Service Manual 55 Table 51: Recommended Equipment (Cont.) 56 1780R-Series Service Manual Table 51: Recommended Equipment (Cont.) Page 58 1780R-Series Service Manual Adjustment List 1780R-Series Service Manual 59 510 1780R-Series Service Manual 1780R-Series Service Manual 511 Procedure Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Preventive Maintenance Cleaning or Changing the Fan Filter Performance Checks and Readjustments Cleaning Visual Inspection Exterior CRT Interior Static-Sensitive Components Page Corrective Maintenance Obtaining Replacement Parts Mechanical Disassembly/Assembly Inner Bezel Frame Removal Graticule Light Removal Instrument Removal from Rack Mounting Cabinet or Portable Case CRT Removal Page CRT Replacement Removing the Input & BNC Board Removing the Fuse Board Page Removing the LV Power Supply Board Removing the Vectorscope Board Removing the Oscillator Board Removing the Z-Axis Board Troubleshooting Troubleshooting Aids Foldout Pages Parts Lists Selected Components Page Page General Troubleshooting Techniques Page Troubleshooting Procedures Board Accessibility LV Power Supply Board Z Axis and Oscillator Boards Power Supply Troubleshooting Equipment Page Page Page Page Page Current Limit Adjustment (A1R466) Page Touch Panel Sensitivity Adjustment (A9R292) Page Options CRT Options Power Cord Options Page Page 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 1780R-Series Service Manual 83 Manufacturers cross index code Manufacturer Address City, state, zip code 84 1780R-Series Service Manual 1780R-Series Service Manual 85 86 1780R-Series Service Manual Page 88 1780R-Series Service Manual Replaceable electrical parts list 1780R-Series Service Manual 89 810 1780R-Series Service Manual 1780R-Series Service Manual 811 812 1780R-Series Service Manual 1780R-Series Service Manual 813 814 1780R-Series Service Manual 1780R-Series Service Manual 815 Page 1780R-Series Service Manual 817 818 1780R-Series Service Manual 1780R-Series Service Manual 819 820 1780R-Series Service Manual 1780R-Series Service Manual 821 822 1780R-Series Service Manual 1780R-Series Service Manual 823 824 1780R-Series Service Manual 1780R-Series Service Manual 825 826 1780R-Series Service Manual 1780R-Series Service Manual 827 828 1780R-Series Service Manual 1780R-Series Service Manual 829 830 1780R-Series Service Manual 1780R-Series Service Manual 831 832 1780R-Series Service Manual 1780R-Series Service Manual 833 834 1780R-Series Service Manual 1780R-Series Service Manual 835 836 1780R-Series Service Manual 1780R-Series Service Manual 837 838 1780R-Series Service Manual 1780R-Series Service Manual 839 840 1780R-Series Service Manual 1780R-Series Service Manual 841 842 1780R-Series Service Manual 1780R-Series Service Manual 843 844 1780R-Series Service Manual 1780R-Series Service Manual 845 846 1780R-Series Service Manual 1780R-Series Service Manual 847 848 1780R-Series Service Manual 1780R-Series Service Manual 849 850 1780R-Series Service Manual 1780R-Series Service Manual 851 852 1780R-Series Service Manual 1780R-Series Service Manual 853 854 1780R-Series Service Manual 1780R-Series Service Manual 855 856 1780R-Series Service Manual 1780R-Series Service Manual 857 858 1780R-Series Service Manual 1780R-Series Service Manual 859 860 1780R-Series Service Manual 1780R-Series Service Manual 861 862 1780R-Series Service Manual 1780R-Series Service Manual 863 864 1780R-Series Service Manual 1780R-Series Service Manual 865 866 1780R-Series Service Manual 1780R-Series Service Manual 867 868 1780R-Series Service Manual 1780R-Series Service Manual 869 870 1780R-Series Service Manual 1780R-Series Service Manual 871 872 1780R-Series Service Manual 1780R-Series Service Manual 873 874 1780R-Series Service Manual 1780R-Series Service Manual 875 876 1780R-Series Service Manual 1780R-Series Service Manual 877 Page 1780R-Series Service Manual 879 880 1780R-Series Service Manual 1780R-Series Service Manual 881 882 1780R-Series Service Manual 1780R-Series Service Manual 883 884 1780R-Series Service Manual 1780R-Series Service Manual 885 886 1780R-Series Service Manual 1780R-Series Service Manual 887 888 1780R-Series Service Manual 1780R-Series Service Manual 889 890 1780R-Series Service Manual 1780R-Series Service Manual 891 892 1780R-Series Service Manual 1780R-Series Service Manual 893 894 1780R-Series Service Manual 1780R-Series Service Manual 895 896 1780R-Series Service Manual 1780R-Series Service Manual 897 898 1780R-Series Service Manual 1780R-Series Service Manual 899 8100 1780R-Series Service Manual 1780R-Series Service Manual 8101 8102 1780R-Series Service Manual 1780R-Series Service Manual 8103 8104 1780R-Series Service Manual 1780R-Series Service Manual 8105 8106 1780R-Series Service Manual 1780R-Series Service Manual 8107 8108 1780R-Series Service Manual 1780R-Series Service Manual 8109 Page 1780R-Series Service Manual 8111 8112 1780R-Series Service Manual 1780R-Series Service Manual 8113 8114 1780R-Series Service Manual 1780R-Series Service Manual 8115 8116 1780R-Series Service Manual 1780R-Series Service Manual 8117 8118 1780R-Series Service Manual 1780R-Series Service Manual 8119 8120 1780R-Series Service Manual 1780R-Series Service Manual 8121 8122 1780R-Series Service Manual 1780R-Series Service Manual 8123 8124 1780R-Series Service Manual 1780R-Series Service Manual 8125 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1780R-Series Service Manual 8157 8158 1780R-Series Service Manual 1780R-Series Service Manual 8159 8160 1780R-Series Service Manual 1780R-Series Service Manual 8161 8162 1780R-Series Service Manual 1780R-Series Service Manual 8163 8164 1780R-Series Service Manual 1780R-Series Service Manual 8165 8166 1780R-Series Service Manual Diagrams and Circuit Board Illustrations Symbols Component Values Graphic Items and Special Symbols Used in This Manual Component Locator Diagrams Page Page Page Page Page Page Page Page A8 Input & BNC Board <1> Component Locator A8 Input & BNC Board <1> Component Locator SIG A AMPLIFIER PART OF A8 INPUT & BNC BOARD INPUT AMPLIFIERS A & B1 <1> SIG B1 A8 Input & BNC Board <2> Component Locator A8 Input and BNC Board <2> Component Locator AMPLIFIER SIG B2 PART OF A8 INPUT & BNC BOARD INPUT AMPLIFIERS B2 & B3 <2> NOTE: SEE DIAGRAM <1> FOR WAVEFORM Page Page A2 A6 Vectorscope & A2 Waveform Board <3> Component Locator A6 A6 Vectorscope & A2 Waveform Board <3> Component Locator SHIELD BOX PROBE INPUT AMPLIFIER PROBE CALIBRATOR PROBE INPUT & D.C. RESTORER <3> 1780R-SERIES PROBE OUTPUT AMPLIFIER A2 Waveform Board <4> Component Locator A2 Waveform Board <4> Component Locator AMPLIFIER + AMPLIFIER INPUT & REFERENCE SELECTION <4> <3> VIDEO A2 Waveform Board <5> Component Locator A2 Waveform Board <5> Component Locator FLAT DIFFERENCE AMPLIFIER DIFFERENCE AMP & VIDEO FILTERS <5> CURSOR 5 A2 Waveform Board <6> Component Locator A2 Waveform Board <6> Component Locator LIMITER VARIABLE GAIN VERTICAL DEFLECTION <6> X1/X5 VERTICAL READOUT A2 Waveform Board <7> Component Locator A2 Waveform Board <7> Component Locator VERTICAL POSITION VOLTAGECALIBRATOR VERTICAL CONTROL LOGIC, CALIBRATOR, & CURSORS <7> 1 DC RESTORER A2 Waveform Board <8> Component Locator A2 Waveform Board <8> Component Locator +14V POWER SUPPLY REFERENCE SYNC SEPARATOR REF SYNC GENERATOR <8> INTERNAL SYNC SEPARATOR LOW PASS FILTER A2 Waveform Board <9> Component Locator A2 Waveform Board <9> Component Locator REF OR REMOTE SYNC SWITCH <8> LOSS OF INT SYNC DETECTOR FLD1/FLD2 A2 Waveform Board <10> Component Locator A2 Waveform Board <10> Component Locator SWITCH BLANKING RETRACE & END OF SWEEP FIELD RAMP GENERATOR LINE RAMP A2 Waveform Board <11> Component Locator WAVEFORM BLANKING READOUT SWITCHING MAG MAGNIFIER AMP <7> A2 Waveform Board <12> Component Locator A2 Waveform Board <12> Component Locator SAMPLE & HOLDS <6> HORIZONTAL LATCHES & DAC <12> <11> <5> <7> A2 Waveform Board <13> Component Locator A2 Waveform Board <13> Component Locator SLOW SWEEP RAMP GENERATOR EXT HORIZONTAL INPUT AMPLIFIER DECOUPLED SUPPLIES 2.2V SUPPLY <12> A2 Waveform Board <14> Component Locator A2 Waveform Board <14> Component Locator OSCILLATOR PHASE CONTROL LOGIC FLYWHEEL COUNTER <9> COLOR FRAME A2 Waveform Board <15> Component Locator A2 Waveform Board <15> Component Locator SYNC 50% DETECTOR <4> SCH SYNCLOCKED OSCILLATOR <15> PHASE SHIFTER LOCK DETECTOR A5 Microprocessor Board <16> Component Locator A5 Microprocessor Board <16> Component Locator LATCH/BUFFER <19> <20> <21> MASTER MPU <16> <17> INT. CHIP SELECT A5 Microprocessor Board <17> Component Locator A5 Microprocessor Board <17> Component Locator ROM MULTIPLEXER DYNAMIC RAM, ROM, & NOVRAM <17> NVRAM CONTROL A5 Microprocessor Board <18> Component Locator A5 Microprocessor Board <18> Component Locator PROGRAM STATIC PROCESSOR MEMORY RAM ONE-SHOT A5 Microprocessor Board <19> Component Locator A5 Microprocessor Board <19> Component Locator UART RS232/RS422 INTERFACE <20> UART & A/D <19> <16> REMOTE SYNC A5 Microprocessor Board <20> Component Locator A5 Microprocessor Board <20> Component Locator SAMPLE & HOLD HORIZ READOUT ENGINE & READ OUTPUT <20> <17><21> COUNTER SAMPLE & HOLD DRIVER READOUT MULTI PLEXER STATE MACHINE A5 Microprocessor Board <21> Component Locator A5 Microprocessor Board <21> Component Locator <18> TRANSCEIVER <16> INTERCONNECT <21> PROGRAMMED LOGIC ARRAY A10 Microprocessor Annex Board <22> Component Locator KEYBOARD DISPLAY <23> A10 MICROPROCESSOR ANNEX BOARD MICROPROCESSOR ANNEX <22> <24> A12 Front Switch Panel Board <23> Component Locator A12 Front Switch Panel Board <23> Component Locator RIGHT DISPLAY LEFT DISPLAY FRONT SWITCH PANEL <23> MAGNIFIER SWEEP RATE GAIN RIGHT DISPLAY LEFT DISPLAY WAVEFORM SWEEPS GAIN MAGNIFIER WAVEFORM SWEEPS A3 Touch Front Panel Board <24> Component Locator A3 Touch Front Panel Board <24> Component Locator MONITOR < A9 FRONT TOUCH PANEL BOARD TOUCH PANEL <24> > A6 Vectorscope Board A6 Vectorsope Board <25> Component Locator A5 Vectorscope Board <25> Component Locator Page GAIN CELL <26> <30> <28> <27> <30> DATA LATCHES A6 Vectorscope Board <26> Component Locator A6 Vectorscope Board <26> Component Locator 1 DIFFERENTIAL GAIN CURRENT DIFF PHASE/GAIN <26> OUTPUT AMPLIFIER LOW PASS FILTER A6 Vectorscope Board <27> Component Locator A6 Vectorscope Board <27> Component Locator CONTROL SIGNAL 1 BLANKING LOGIC 3<25> <28> A6 Vectorscope Board <28> Component Locator A6 Vectorscope Board <28> Component Locator VERTICAL VECTOR POSITION CLAMP DEMODULATORS <28> HORIZONTAL VECTOR HORIZONTAL BY A6 Vectorscope Board <29> Component Locator A6 Vectorscope Board <29> Component Locator PICTURE MONITOR SWEEPS XY INPUT AMPLIFIER 1780RSERIES XY INPUTS & PIX MONITOR <29> A6 Vectorscope Board <30> Component Locator A6 Vectorscope Board <30> Component Locator BUFFER RY VECTOR DEFLECTION AMPS <30> 8 9 A7 Oscillator Board A7 Oscillator Board <31> Component Locator A7 Oscillator Board <31> Component Locator Page SAMPLING TRANSDUCTANCE SUBCARRIER REGENERATOR <31> 34 BANDPASS A7 Oscillator Board <32> Component Locator A7 Oscillator Board <32> Component Locator <31>4 FILTERS <34> DIGITAL SHIFTER <32> ERROR N A7 Oscillator Board <33> Component Locator A7 Oscillator Board <33> Component Locator VCO SWEEP ACQUISITIONPHASE 1 uS 2 256 A7 Oscillator Board <34> Component Locator A7 Oscillator Board <34> Component Locator ALTERNATE MODE SWITCH SWITCH CONTROL <31> <33> DEMODULATED CHROMA SOURCE SWITCH A15 Filter Board A15 Filter Board <35> Component Locator A15 Filter Board <35> Component Locator Page BYPASSADDER SUBTRACTOR DIGITAL RECURSIVE FILTER <35> MEMORY WRITE CONTROL COUNTER A4 ZAxis Board A4 ZAxis Board <36> Component Locator A4 ZAxis Board <36> Component Locator Page WAVEFORM ZAXIS AMP WAVEFORM ZAXIS VECTORSCOPE ZAXIS 1780RSERIES ZAXIS <36> A4 ZAxis Board <37> Component Locator A4 ZAxis Board <37> Component Locator 10MHZ SAMPLE AND HOLD TIMING CURSORS <37> PHASE DETECTOR 10MHZ REF A4 ZAxis Board <38> Component Locator A4 ZAxis Board <38> Component Locator and J180 Connections & CURSOR ENABLE CURSOR VS SWEEP SYNCHRONIZATION <39> CURSOR SELECT <39> A4 ZAxis Board <39> Component Locator A4 ZAxis Board <39> Component Locator ANALOG MULTIPLEXERS DAC REF 1780R-SERIES CRT DISPLAY DAC <39> A4 ZAxis Board <40> Component Locator A4 ZAxis Board Board <40> Component Locator SCALE DRIVERSPULSE WIDTH MODULATORS TRIANGLE GENERATOR POWER SUPPLY TRACE ROTATION DRIVERS 1780RSERIES SCALE ILLUMINATION & TRACE ROTATION <40> A3 Vector High Volts Board <41> Component Locator A3 Vector High Volts Board <41> Component Locator, waveforms, and J100 connections OSC 33KHZ VECTOR HIGH VOLTS <41> VISUAL AID CRT A16 Waveform Hi Volts Board <42> Component Locator A16 Waveform Hi Volts Board <42> Component Locator 4X OSC <43> WAVEFORM HIGH VOLTS <42> 25KHZ LINE SELECT A1 Low Volts Board <43> Component Locator A1 Low Volts Board <43> Component Locator OUTPUT FILTERS LINE RECTIFIER AND FILTER LOW VOLTAGE POWER SUPPLY <43> OVERVOLTAGE PROTECTION A11 Interconnect Board <44> Component Locator A11 Interconnect Board <44> Component Locator <46> <46> VECTORSCOPE, WAVEFORM, & OSCILLATOR <44> <46> <35> <45> <46> A11 Interconnect Board <45> Component Locator A11 , A13, and A14 Boards <45> Component Locator ZAXIS GRATICULE LIGHTS A13 VECTORSCOPE GRATICULE LIGHTS BOARD HIGH VOLTAGE A11 Interconnect Board <46> Component Locator A11 Interconnect Board <46> Component Locator <44> 1780RSERIES MICROPROCESSOR & FRONT PANEL CONTROLS <46> Page Mechanical Parts List Parts Ordering Information Using the Replaceable Mechanical Parts List Cross IndexMfr. Code Number to Manufacturer Abbreviations Instrument Accessories 1780R-Series Service Manual 103 Manufacturers Cross Index Code Manufacturer Address City, State, Zip Code 104 1780R-Series Service Manual Replaceable Parts List Discontd Qty Name & Description Mfr. Code Mfr. Part Number 1780R-Series Service Manual 105 106 1780R-Series Service Manual 1780R-Series Service Manual 107 108 1780R-Series Service Manual 1780R-Series Service Manual 109 1010 1780R-Series Service Manual Discontd Qty Name & Description Mfr. Code Mfr. Part Number