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Tektronix Manuals
Test Equipment
1720
Instruction manual
Tektronix 1720 Series Instruction Manual
Vectorscope
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Instruction manual
(226 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Change Information
Table of Contents
List of Tables
Operator's Safety Summary
1720-Series
Service Safety Summary
For Qualified Service Personnel Only
Section 1 Introduction
Standard Accessories
Optional Accessories
Field-Installable Upgrades
L * Power Cord Options
Safety Information
Specification
Supplemental Information
Section 2 Operating Instructions
Front-Panel Controls and Indicators
Input 2.0
Fig. 2-1 Control and Indicator Locations
Miscellaneous
Subminiature D-Type Connectors
Power Input
Miscellaneous
INPUT Switching
REF Switching
Line Select 2.10
Operator's Checkout Procedure
Fig. 2-4 1720-Series Typical Vector Display
Fig. 2-7 Connection for Using Black Burst Signal for External Reference
Fig. 2-8 1720-Series Test Circle Display
Measurement Applications
Color Measurements
Fig. 2-9 NTSC Standard Color Phase Vector Diagram
Fig. 2-12 1721 Graticule Showing the Fig. 2-13 Fine Detail of the Magenta Targets of the 1720 Graticule
Measurement of Color Bars
Fig.2-14
Fig. 2-15 1720 Graticule Showing Relationship between the Vector Targets and the
Differential Gain and Phase Measurements
Fig. 2-16 1721 Graticule Showing Relationship between the Vector Targets and the U and V Modulation Axes
Fig.2-18 | Makingdifferential Gain Measurements
Y Measurements
Making Stereo Audio Phase Measurements
Looking at Incidental Carrier Phase Modulation
Service Information
Packaging
Electrical Installation
Power Source 2.0.0.0
Mains Frequency and Voltage Ranges
Section 3 Installation
Operating Options
Auxiliary Control
YINPUT Connector
AUXILIARY Connector
Mechanical Installation
Rackmounting
Custom Installation 0.0.0.0
Fig. 3-6 1700F
Cabinet Options ©0000
DC Power Supply Field Upgrade
Fig. 3-7 a Typical Console Installation that Can be Used as a Guide When Customizing
Rear View
Side View
Bottom View
Section 4 Theory of Operation
Block Diagram
Fig. 4-1 Block Diagram of the 1720-Series
Videoinput
Chrominance Processing
Output Amplifiers
Circuit Descriptions
Xyinputamps
Deflection Amplifiers
Center Dot Comparators
Reference Switch
Reference AMPS
Sync Separator
} Fig. 4-2. Block Diagram of the Phase Lock Loop
Back Porchsample
Burstclamp
Lock Detector and Bandwidth Switch
Error Amplifier 2.00.0
PAL Phasing
VCXO and Phase Shifter
Low-Voltage Power Supply
Checks and Adjustments
Recommended Equipment List
Performance Check
Performance Check Procedure
Preliminary Setup
Fig. 5-2 Loop-Through Connection of Black Burst Signal to both EXT REF Andch-B
Ref Input
Fig. 5-5 Connections for Variable Gain Check
Fig. 5-6 Setting up the Return Loss Bridge
Fig. 5-8 Rear-Panel XY INPUT Connector Showing Inputs
Fig. 5-9 Audio Frequency XY Display
Main Board
Fig. 5-11 Starting Connections for the Adjustment Procedure
Section 6 Maintenance
Preventive Maintenance
Visual Inspection
Static-Sensitive Components
Troubleshooting
Parts Lists 2.20
Major Assembly Interconnection
General Troubleshooting Techniques
Serial Port and LED Driver Diagnostics
Obtaining Replacement Parts
Mechanical Disassembly/Assembly
CRT Removal
Removing the Rear Panel
Removing the Front Panel Circuit Board
Removing the Main Board
Removing the Power Supply Board
Front Panel Assembly
Identification Tag
Repackaging for Shipment
Section 7 Options
Cabinets
Plain Cabinet (1700F00)
Side-By-Side Rack Adapter (1700F05)
DC Power Supply
DC Power Supply Field Upgrade Kit (1700F10)
Battery Pack (BP1) 20.0
Section 8 Replaceable Electrical Parts
Parts Ordering Information
Cross Index-Mfr. Code Number to Manufacturer
Section 9 Diagrams and Circuit Board Illustrations
Replaceable Mechanical Parts
Indentation System
Fig.2-17
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Table of Contents
Troubleshooting
Static-Sensitive Components
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Major Assembly Interconnection
81
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