TM 11-5820-890-20-1
1.15.
a.
RT SELF-TEST (RT-1523 THROUGH RT-152313).
RT Self-Test. The RT self-test is selected by setting the FCTN switch to the TST position. The displays
and audio should be as shown below. Some versions of the RT will show “FAIL 5” if self-test is run with
COMSEC set to PT. Setting COMSEC to CT should result in a display of “GOOD”.
RT Self-Test Displays and Audio
The RT display is the first section tested in self-test. The first display is “E
C.” The letter “E” shows that
the ECCM module is present. The letter “C” shows that the COMSEC module is present. If either module
is absent, its letter in the display is replaced by a dash (-), The next display checks the display
elements. All the dots in each digit of the display are lit. The SIG display bars are lit in sequence. The
HUB display is also lit. After the display is checked, the RT continues its self-test. The receive path is
checked at eight frequencies in SC mode and two frequencies in FH mode. As a result of the receive
tests, there are 10 short bursts of unsqueiched rushing noise which can be heard in the handset
However, because these are so quick and close together, they are difficult to count. At the end of a
successful self-test, a beep can be heard in the handset, and the display will read “GOOD”.
FAILURE- Codes. If a failure occurs, displays on the RT are interpreted as follows:
FAIL 1
Internal RT Failure Receive
FAIL 2
Internal RT Failure Data Rate Module
FAIL 3
Internal RT Failure ECCM
FAIL 4
Internal Failure Two Wire
FAIL 5
COMSEC Failure/RT not in CT
FAIL 6
SNAP Test or Internet Controller/ FHMUX Failure
FAIL 7
Internal RT Failure Routing Module
FAIL 8
internal RT Failure Routing Module
RT SELF-TEST (RT-1523E).
a .
RT SELF-Test. The RT self-test is divided into two parts: normal user self-test and detailed maintenance
test. Normal user self-test is initated by setting the FCTN switch to TST. The detailed maintenance
is for Direct Support maintenance only.
b .
Failure Codes. The following detailed maintenance failure code is applicable to unit maintenance:
FAIL SNAP
SNAP Test or Internet Controller/FHMUX Failure
1-19
