Section 5—2205 Service
ADJUSTMENT PROCEDURE
INTRODUCTION
PURPOSE
The Adjustment Procedure is used to return the
instrument to conformance with the Performance
Requirement statements listed in Table 1-1. Adjustî™–
ments contained in this procedure should only be
performed after checks from the Performance
Check Procedure {Section 4) have indicated a need
for readjustment or after repairs have been made to
the instrument.
use of equipment other than that recommended,
utilize the Minimum Specification column to deterî™–
mine whether available test equipment will suffice.
Detailed operating instructions for test equipment
are not given in this procedure. If more operating
information is required, refer to the appropriate test
equipment instruction manual.
STRUCTURE
This procedure is structured into subsections,
each of which can be performed Independently to
permit adjustment of individual sections of the
instrument. For example, if only the Vertical section
fails to meet the Performance Requirements or has
been repaired, it can be readjusted with little or no
effect on other sections of the instrument.
The Power Supply section, however, affects all
other sections of the instrument. Therefore, if reî™–
pairs or readjustments have been made that change
the absolute value of any of the supply voltages, the
entire Adjustment Procedure should be performed.
At the beginning of each subsection is a list of all
the front-panel control settings required to prepare
the instrument for performing Step 1 in that subî™–
section. Each succeeding step within a subsection
should be performed in sequence and in its entirety
to ensure that control settings will be correct for enî™–
suing steps. All steps within a subsection should be
completed.
TEST EQUIPMENT REQUIRED
Table 4-1 is a complete list of the test equipment
required to accomplish both the Performance Check
Procedure in Section 4 and the Adjustment Proî™–
cedure in this section. To assure accurate measureî™–
ments, it is important that test equipment used for
making these checks meet or exceed the speciî™–
fications described in Table 4-1. When considering
LIMITS AND TOLERANCES
The limits and tolerances stated in this procedure
are instrument specifications only if they are listed in
the Performance Requirements column of Tablet-1.
Tolerances given are applicable only to the instruî™–
ment undergoing adjustment and do not include test
equipment error. Adjustment of the instrument must
be accomplished at an ambient temperature
between +20°C and +30°C, and the instrument must
have had a warm-up period of at least 20 minutes.
ADJUSTMENTS AFFECTED BY REPAIRS
Repairs to a circuit may affect one or more
adjustment settings of the instrument. Table 5-1
identifies the adjustment(s) affected due to repairs
or replacement of components on a circuit board.
Refer to Table 5-1 if a partial procedure is perî™–
formed or if a circuit requires readjustment due to
repairs to a circuit. To use Table 5-1, first find, in
the leftmost column, the circuit that was repaired.
Then move to the right, across that row, until you
come to a darkened square, move up the column
and check the accuracy of the adjustment found at
the heading of that column. Readjust if necessary.
PREPARATION FOR ADJUSTMENT
The instrument cabinet must be removed to
perform the Adjustment Procedure. See the Cabinet
remove and replace instructions located in the
Maintenance section of the manual.
5-1
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