Adjustments
Model
8904A
A
pin-to-pin voltage difference of
32
Vdc
may
be found
on
many of
the Multifunction Synthesizer’s circuit board connectors. Be careful while
working on the circuit boards with power supplied to the instrument.
The back-light drive for the front-panel-display utilizes a
400
Vac
signal.
Be careful when working on
or
near the front panel to avoid touching any
exposed wires
on
the connector to the display.
5-3.
EQUIPMENT REQUIRED
Each adjustment procedure contains
a
list of required test equipment. The test equipment is identified
by callouts in the test setup diagrams where included.
If substitutions must be made for the specified
test
equipment, refer to Table
1-2
for the minimum
specifications. It is important that the
test
equipment meet the critical specifications listed in the
table
if
the Multifunction Synthesizer
is
to meet its performance requirements.
5-4.
POST-REPAIR TESTS, ADJUSTMENTS, AND
CHECKS
Table
5-1
lists the performance tests, adjustments, and checks needed to calibrate
or
verify calibration
of
a
repaired assembly. The tests, adjustments, and checks are classified by the assembly repaired
or
replaced. Table
5-1
is
also useful
as
a cross reference between performance tests and assemblies when
the failure is a specification that
is
slightly out of limits.
The Basic Functional Checks mentioned in the table are explained in the introduction to Section
4.
5-2
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