Tektronix VITS100 Manual de usuario Pagina 122
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Valorado. / 5. Basado en revisión del cliente
Maintenance
7–10
VITS100 NTSC VITS Inserter Instruction Manual
BNC Hex nuts
(3)
J27
Power supply shield
Line filter screws (2)
Mounting screw
Mounting screw
Mounting screw
Mounting screw
Mounting screw
Mounting screw
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 Board
Removal/Replacement
- Instruction Manual 1
- NTSC VITS Inserter 1
- 070-8333-02 1
- WARRANTY 3
- Service Assurance 5
- Table of Contents 7
- List of Figures 9
- List of Tables 11
- General Safety Summary 13
- Service Safety Summary 15
- Getting Started 17
- Accessories and Options 20
- Functional Check 21
- Installation 23
- Operating Basics 25
- Rear Panel 28
- Insertion Options 29
- Passing Program Video 30
- Auto VIRS 30
- Inserting a Source ID 30
- VITS Selection 31
- Switch/Line Assignments 32
- Switch Settings 33
- Remote Control 34
- Specifications 35
- Waveform Diagrams 48
- Figure 3–2: 7.5% Black 49
- Figure 3–3: 50% Gray 49
- Figure 3–4: FCC Color Bars 50
- Figure 3–5: FCC Composite 50
- Figure 3–6: Multiburst 51
- Figure 3–7: Multipulse 51
- Figure 3–8: NTC7 Combination 52
- Figure 3–9: NTC7 Composite 52
- Figure 3–10: Red Field 53
- Figure 3–11: SIN X/X 53
- Figure 3–12: VIRS 54
- Figure 3–13: Cable Multiburst 54
- Figure 3–14: Cable Sweep 55
- Theory of Operation 59
- Circuit Description 62
- Signal and Switching 65
- Source ID Generation 65
- Power Supply 66
- Performance Verification 71
- Equipment Required 74
- Verification Procedure 75
- Select VITS 76
- Line Input Range 78
- Program Channel to 78
- Test Signal Matching 78
- Phase Match of 79
- Inserted Test Signal to 79
- Program Video Channel 79
- Phase Match Bypass Path 81
- Program Video Gain and 81
- Line Tilt 81
- Chrominance to 82
- Luminance 82
- Gain and Delay 82
- Differential 83
- Gain and Phase 83
- Pulse-to-Bar Ratio 83
- K-Factor 84
- SCH Phase 85
- Signal-to-Noise Ratio 85
- Hum Rejection 85
- Luminance Risetime 86
- Chrominance Risetime 87
- Genlock Checks 87
- Return Loss and 90
- Input/Output Impedance 90
- Center Frequency 10 MHz 91
- Reference Level 0 dB 91
- Freq Span/Div 10 MHz 91
- Frequency Response and 92
- Crosstalk 92
- Auto VIRS Insertion 94
- Source ID 95
- Adjustment Procedure 100
- Preliminary Setup 101
- Adjustment Procedures 102
- Power Supply Adjustment 103
- Genlock Adjustments 103
- Gain Adjustments 105
- Frequency Response 107
- Adjustments 107
- Frequency Range High 108
- Markers On 108
- Composite On 108
- Amplitude Full 108
- Sweep On 108
- OUTPUTINPUT 109
- Oscillator Adjustment 110
- Maintenance 111
- Preparation 114
- Static Sensitive Components 114
- Circuit Board Jumpers 116
- Mode Selection Jumpers 117
- Test Jumpers 117
- Table 7–2: Test Jumpers 118
- Cleaning and Inspection 119
- Top Cover 120
- Front Panel 120
- Inserter Circuit Board 121
- Oscillator Circuit Board 122
- Removal/Replacement 122
- Diagnostics 123
- Replaceable Electrical Parts 127
- Component Number 130
- Subassembly Number 130
- (optional) 130
- Diagrams 157
- 159
- 159
- Figure 9–2: A1A1 Oven Board 162
- TEST SIGNAL MEMORY 163
- TEST SIGNAL SELECT 2 165
- P/O A1 INSERTER BOARD 167
- CLAMP, AND SYNC 171
- STRIPPER 171
- VIDEO INPUT BUFFER 171
- VIRS DETECT 171
- A1A1 CRYSTAL OVEN BOARD 173
- ANALOG OUTPUT 7 175
- POWER SUPPLY 8 177
- Replaceable Mechanical Parts 187
- Abbreviations 190
- Chassis Parts 190
- Mfr. Code to Manufacturer 190
- Cross Index 190
- Figure 10–1: Exploded view 194
- Appendix 195
- Appendix A: Options 197
- Option 1J 198
- Factory Configuration 199
- Option 1M 200
- Option 1M Signals 201
- Option 2 202
- Figure A–5: Cable Multiburst 203
- Figure A–6: Cable Sweep 203
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