TM 11-5820-922-40-1
SECTION IV
PERFORMANCE TEST AND TROUBLESHOOTING
symbol at the end of the test indicates
GENERAL.
successful completion of the test. The
troubleshooting procedure is completed
3-55.
Performance test and trouble-
when a fault indication block is reached.
shooting of the amplifier-converter and
Once a fault is corrected, the perform-
its circuit cards requires a known-good
ance test is resumed at the point where
amplifierconverter as a test bed. The
the first fault indication occurred. If
circuit card or unit under test (UUT)
a flowchart is extended to another sheet,
replaces the known-good circuit card of
the continuation symbol is used.
the test bed amplifier-converter, and
is connected to the test bed by a fabri-
cated extender cable. (This applies
TEST AND TROUBLESHOOTING REFER-
only to the amplifier-squelch and TTY-
ENCE DATA. The performance test flow-
FSK converter. The EMI filter, rfi
charts are used in conjunction with the
filter, and audio filter, because of
depicts the arrangement of maintenance
are tested statically.)
information contained in each mainte-
nance chapter.
PERFORMANCE TEST AND
TROUBLESHOOTING .
1.
Disassembly and Reassembly Proce-
The performance test flowcharts
dures. These procedures provide the
provide the necessary procedures and
information necessary to remove and
information to completely test the
replace a unit under test.
amplifier-converter and applicable cir-
2.
Performance Test Setup Diagrams.
troubleshooting procedures as an aid in
The test setup diagrams show what test
fault isolating to a component or group
equipment is required for the perform-
of components if the UUT does not pass a
ance test and troubleshooting, and how
performance test.
to connect the test equipment to the
unit under test.
performance test procedure path on the
Alignment Procedures. The align-
3.
ment procedures are performed when speci-
line. The procedure begins at the bub-
fied in the troubleshooting procedures.
ble symbol that reads "unit under test."
They are usually required during trouble-
Next, the initial setup block references
shooting to ensure the unit under test
applicable disassembly and reassembly
is properly aligned before determining
Instructions, a test setup diagram, and
faulty components.
provides initial switch settings required
for the test. The initial setup block
4. Junctional Block Diagrams. The
is followed by a series of procedural
blocks which contain actions required to
produce a result, and decision blocks
may be used as an aid to troubleshooting
in conjunction with the flowcharts.
which ask whether the desired result
occurred. If the desired result has
5.
occurred, the "yes" pathway is followed;
Schematic Diagrams. The sche-
if the desired result did not occur, the
matics for the "Unit Under Test" are
used to aid in identifying suspected
"no" pathway is followed for the trouble-
shooting procedure. The "Test Passed"
faulty components. For example, if the