TM 11-7025-221-10
2-2. ALARMS Indicators.
The five ALARMS indicators are viewed through the display window and are located immediately above
the 3-line display. The ALARMS indicators are normally off. One or more of the indicators light when
a fault is detected by the TD-1337(V)/G.
NOTE
There is a hierarchy (rank or order of importance) associated with
the ALARMS indicators. If multiple indicators light, this ranking al-
lows for systematic troubleshooting. Thus, troubleshooting would
start with lit indicator of highest ranking and ignore indicators of
lower rank. Ranking of indicators is as presented below (VCXO
is highest ranking through MINOR which is lowest ranking).
VCXO Indicator. Lights when fault is detected in VCXO (voltage controlled oscillator) circuit. If fault
goes away, VCXO indicator will go out.
PROCESSOR Indicator. Lights when fault is detected in processor circuits. If fault goes away, PRO-
CESSOR indicator will go out.
BUS Indicator. Lights when a fault lasting for more than one second is detected with the common
data bus lines in the TD-1337(V)/G. If fault goes away, BUS indicator will go out and MINOR
indicator will light.
MAJOR Indicator.
1. Lights when a fault (other than a fault associated with the BUS, PROCESSOR, or VCXO)
is detected that has lasted for more than one second and continues to exist. Detected fault
may be caused by a faulty circuit in TD-1337(V)/G or by a faulty input to TD-1337(V)/G.
2. If additional faults (of same type) are detected while first fault detected is still present, indicator
remains lit.
3. Indicator goes out when fault(s) that caused it to light are no longer detected. (MINOR indicator
now lights.)
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