Instruction manual

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Preface
This manual documents the TEKTRONIX 1720/1721 Vectorscope. Information
that applies to all instruments in the series refers to t he 1720/1721. Information
that applies to only specific instruments within the series refers to the model
numbers of t hose instruments (i.e., 1720, 1721).
The information in this manual i s intended for i nstrument operat ors and service
technicians. Operators are assumed to be familiar with basic television terms and
measurements. Qualified service technicia ns are also assumed to be familiar with
television terms and measurements, and have moderate experience with analog
and logic circuits.
Section 1, Introduction and Specification, includes a general description of the
instrument followed by the Specifications. The Specifications include references
to the corresponding Performance check steps.
Section 2, Operating Instructions, familiarizes the user with the front-- and
rear-- panel controls, connectors, and indicators; includes an operator’s checkout
procedure; and includes other operator familiarization information.
Section 3, Installation, includes electrical and mechanical installation informa-
tion. The electrical installation information includes adjustments and operational
changes available with the instrument. The mechanical installation information
includes rackmounting, custom installation, and portable use.
Section 4, Theory of Operation, provides an overall block diagram description
and detailed circuit descriptions. Read the block diagram description for an
overview of the instrument. The detailed circuit descriptions should be used
with the block diagram and schematic diagrams in the foldout pages for specific
information about individual circuits.
Section 5, Checks and Adjustments, includes the Performance Check
Procedure and the Adjustment Procedure. The Performance Check Procedure is
used to verify that the instrument’s performance is within its specifications, and
the Adjustment Procedure is used to adjust the instrument to meet its specifica-
tions. The procedures are preceded by a list of recommended test equipment.
Each procedure has a short form listing of the individual steps.
Section 6, Maintenance, includes preventive, troubleshooting, and corrective
information.
Section 7, Options, contains summaries of available instrument options.
Additional information concerning options is included in appropriate places
throughout the manual.
Section 8, Replaceable Electrical Parts, includes ordering information and part
numbers for all replaceable electrical parts.