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TM 11-5820-917-13
PERFORMANCE
TEST
PROCEDURE
5-29. Performance tests on the receiver involve use of the automatic self-test rou-
tine and measurement of the module test point characteristics to verify normal
operation.  The test equipment required for test point measurement is listed in
5-30. RECEIVER TEST.  The receiver test routine activated by the front panel
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.
5-31. TEST POINT VERIFICATION.  Figures 5-4 through 5-11 provide a descrip-
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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