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Tektronix VITS100 Oscillator Circuit Board Removal/Replacement

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Maintenance

7–10 VITS100 NTSC VITS Inserter Instruction Manual

BNC Hex nuts

(3)

J27

Power supply shield

Line filter screws (2)

Mounting screw

Figure 7–2: Mounting hardware for the inserter circuit board

This procedure requires a #2 POZIDRIV® screwdriver, a #4 hex nut driver, and a

#1 POZIDRIV® screwdriver.

Removal. Use the following procedure to remove the oscillator circuit board.

1. Remove the instrument top cover.

2. Remove the two screws that hold the plastic insulating case to the inserter

circuit board and remove the top part of the case.

Oscillator Circuit BoardRemoval/Replacement

Contents

Main Page WARRANTY Page Service Assurance Service Assurance Advantages For Information and Ordering Page Table of Contents Page List of Figures Page List of Tables Page General Safety Summary To Avoid Fire or Personal Injury Symbols and Terms Page Service Safety Summary Page Page Page Getting Started VITS Inserter Functions Test Signals Accessories and Options Auto VIRS Bypass Functional Check and Installation Functional Check Page Installation Page Page Page Operating Basics Front Panel BYPASS Switch and LED UNLOCKED LED POWER LED Rear Panel Power Program In Insertion Options Program Out Inserting Test Signals Monitor Out Remote Connector Passing Program Video Auto VIRS Inserting a Source ID VITS Selection Switch/Line Assignments Switch Settings Remote Control Page Page Specifications Specification Tables Page VITS100 NTSC VITS Inserter Instruction Manual 33 Table 34: FCC Composite characteristics Page VITS100 NTSC VITS Inserter Instruction Manual 35 Table 38: NTC7 Combination characteristics 36 VITS100 NTSC VITS Inserter Instruction Manual Table 39: NTC7 Composite characteristics Table 310: Red Field characteristics VITS100 NTSC VITS Inserter Instruction Manual 37 Table 311: SIN X/X characteristics Table 312: Vertical Interval Reference Signal characteristics Table 313: Cable Multiburst (Option 2) characteristics 38 VITS100 NTSC VITS Inserter Instruction Manual Table 314: Cable Sweep (Option 2) characteristics Table 315: Genlock characteristics VITS100 NTSC VITS Inserter Instruction Manual 39 Table 316: Power Supply characteristics Table 317: Physical characteristics Page VITS100 NTSC VITS Inserter Instruction Manual 311 Table 319: Certifications and compliances Waveform Diagrams Page Page Page Page Page Page Page Page Page Page Page Page Theory of Operation Functional Description Circuit Description Test Signal Generation Genlock Page Signal and Switching Control Source ID Generation Power Supply Page Theory of Operation Figure 41: Inductor and switching transistor switching functions 48 VITS100 NTSC VITS Inserter Instruction Manual Page Page Page Page Performance Verification Incoming Inspection Test Verification of Tolerance Values Performance Verification 52 VITS100 NTSC VITS Inserter Instruction Manual Equipment Required Verification Procedure Power Up Test Signal References Select VITS Page Line Input Range Program Channel to TestSignal Matching Phase Match of Inserted Test Signal to Program Video Channel Page Phase Match Bypass Path to Program Path Program Video Gain and Line Tilt Chrominance to Luminance Gain and Delay Differential Gain and Phase Pulse-to-Bar Ratio K-Factor SCH Phase Signal-to-Noise Ratio Hum Rejection Luminance Risetime Chrominance Risetime Genlock Checks Page Page Return Loss and Input/Output Impedance Page Frequency Response and Crosstalk Page Auto VIRS Insertion Page Page Page Page Adjustment Procedures Static Discharge Precautions Recommended Test Equipment Adjustment Procedures 62 VITS100 NTSC VITS Inserter Instruction Manual Adjustment Procedure Preliminary Setup Adjustment Procedures J32 Figure 61: Adjustments and test points 64 VITS100 NTSC VITS Inserter Instruction Manual J56 J57 Power Supply Adjustment Genlock Adjustments Page Gain Adjustments Page Frequency Response Adjustments Page Page Oscillator Adjustment Page Page Maintenance Service Strategy Warranty Repair Service Tektronix Service Offerings Preparation Static Sensitive Components Repair Service For More Information Page Circuit Board Jumpers Mode Selection Jumpers Test Jumpers Maintenance 76 VITS100 NTSC VITS Inserter Instruction Manual Table 72: Test Jumpers Cleaning and Inspection Cleaning Removal and Replacement Instructions Top Cover Front Panel Inserter Circuit Board Oscillator Circuit Board Removal/Replacement Diagnostics Page Maintenance VITS100 NTSC VITS Inserter Instruction Manual 713 Table 73: The User Diagnostics (Cont.) Page 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 VITS100 NTSC VITS Inserter Instruction Manual 83 Manufacturers Cross Index, Electrical Parts Code Manufacturer Address City, State, Zip Code 84 VITS100 NTSC VITS Inserter Instruction Manual Manufacturers Cross Index, Electrical Parts (Cont.) Code City, State, Zip CodeAddressManufacturer VITS100 NTSC VITS Inserter Instruction Manual 85 Manufacturers Cross Index, Electrical Parts (Cont.) Code City, State, Zip CodeAddressManufacturer Page VITS100 NTSC VITS Inserter Instruction Manual 87 Replaceable Electrical Parts List Number Tektronix Part Number Serial No. Effective Serial No. 88 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 89 810 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 811 812 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 813 814 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 815 816 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 817 818 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 819 820 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 821 822 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 823 824 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 825 826 VITS100 NTSC VITS Inserter Instruction Manual VITS100 NTSC VITS Inserter Instruction Manual 827 828 VITS100 NTSC VITS Inserter Instruction Manual Page Page A1 VITS Inserter Board (671-2132-05 & Up) VITS100 NTSC VITS Inserter Instruction Manual 91 Figure 91: A1 VITS Inserter Board (671213205 & Up) 92 VITS100 NTSC VITS Inserter Instruction Manual Table 91: A1 Component Locator 671213205 & Up VITS100 NTSC VITS Inserter Instruction Manual 93 Table 91: A1 Component Locator (continued) Page VITS100 NTSC VITS Inserter Instruction Manual 95 TEST SIGNAL MEMORY 1 Page VITS100 NTSC VITS Inserter Instruction Manual 97 TEST SIGNAL SELECT TEST SIGNAL SELECT 2 Page VITS100 NTSC VITS Inserter Instruction Manual 99 H&V COUNTERS,DECODERS, SOURCE IDENTIFICATION & BYPASS CONTROLS 3 Page VITS100 NTSC VITS Inserter Instruction Manual 911 GENLOCK 4 Page VITS100 NTSC VITS Inserter Instruction Manual 913 CLAMP, AND SYNC STRIPPER VIDEO INPUT BUFFER, Page VITS100 NTSC VITS Inserter Instruction Manual 915 A1A1 CRYSTAL OVEN BOARD 6CLOCKS Page VITS100 NTSC VITS Inserter Instruction Manual 917 ANALOG OUTPUT 7 Page VITS100 NTSC VITS Inserter Instruction Manual 919 POWER SUPPLY 8 Page VITS100 NTSC VITS Inserter Instruction Manual 921 9 REGULATOR & DECOUPLING CAPS Page A1 VITS Inserter Board (671-2132-00 through -04) VITS100 NTSC VITS Inserter Instruction Manual 923 Figure 93: A1 VITS Inserter Board (671-2132-00 04) Page Page Page Page Page Page Page Replaceable Mechanical Parts Parts Ordering Information Using the Replaceable Mechanical Parts List Abbreviations Chassis Parts Mfr. Code to Manufacturer Cross Index VITS100 NTSC VITS Inserter Instruction Manual 103 Manufacturers Cross Index, Mechanical Parts Code Manufacturer Address City, State, Zip Code 104 VITS100 NTSC VITS Inserter Instruction Manual Replaceable Mechanical Parts List Discontd Qty Name & Description Mfr. Effective Serial No. Number Serial No. Page 106 VITS100 NTSC VITS Inserter Instruction Manual A1 Figure 101: Exploded view Page Page Appendix A: Options Option 1J Signal Characteristics Page Option 1M Making Measurements with Option 1M Option 1M Signals Option 2 Signal Characteristics Appendix A: Options VITS100 NTSC VITS Inserter Instruction Manual A7 Figure A5: Cable Multiburst Figure A6: Cable Sweep Page Page Page Index