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| TM 11-5820-917-13
PERFORMANCE
TEST
PROCEDURE
tine and measurement of the module test point characteristics to verify normal
operation. The test equipment required for test point measurement is listed in
TEST switch, performs a self diagnostic check of receiver functional circuits and
power supplies. When the test is initiated, a calibrated test signal is injected into
the receiver front end at a point close to the antenna input. The calibrated test
signal, in conjunction with synthesizer inputs, is subjected to exactly the same
filtering and IF treatment as is a received RF signal. The results of a test are an
audible monitor tone, a go/no-go lamp indication, and a solid bar (350 Hz signal)
across the CRT screen. The test is performed with the receiver sweeping in either
manual or program mode, as follows:
Press the TEST switch, and hold depressed for 10 seconds.
a.
b. Within five seconds, check that the green RCVR lamp lights. If the red
lamp remains lighted, a malfunction is indicated. Refer to step 9, table 5-3
for additional checks to isolate malfunction.
c. On the CRT, verify that a, horizontal line is displayed at 350 Hz (approxi-
mately mid screen on the CRT or 3/4-inch (2 cm) below the bottom of the AGC bar-
graph) and that a fixed tone (1050 Hz) is audible.
AGC bargraph should display four cells (plus or minus one cell).
d.
tion of test point parameters. Used in conjunction with the schematics, test point
measurements enable a fault indication to be diagnosed and isolated. All test
point parameters have expected or nominal test results and include tolerances
where applicable.
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