General Dynamics CG-1220, Operation And Maintenance Manual

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Operation
4-18 CG-1220 DTR
4.2.7 TESTS
The [
TESTS]
menu provides system integrity tests and is intended primarily for
factory testing.
Use of some tests may obscure real-time data, and others may temporarily affect
the performance of the receiver.
 LCD DISPLAY tests every pixel of the LCD by drawing lines in two
alternating patterns. The first pattern displays automatically; the second
pattern will display after a key-press. Press any key to exit test.

LEDS TEST
blinks the top three LED’s four times (the power LED will remain
lighted). The test should last no more than 5 seconds.

FIFO TEST displays a test pattern received from the SPU, in hexadecimal
values. The pattern should be:
R/C A B C D E F G H
1 0000 0001 1111 0002 2222 0004 3333 0008
2 4444 0010 5555 0020 6666 0040 7777 0080
3 8888 0100 9999 0200 AAAA 0400 8888 0800
4 CCCC 1000 DDDD 2000 EEEE 4000 FFFF 8000
FIFO TEST: PASSED
In case of failure, a small “x” will precede the values that do not match.
Press PREV to exit.

DISPLAY TIME DOMAIN
– This function displays the sampled waveform of
the received signal in time domain. NOTE: this is for diagnostic purposes
only; signal strength is not calculated while the time domain is displayed,
thus preventing tracking functionality.