TM 11-5895-846-14
Table 3-10. Alarm Monitor, Operator's Control and Indicators
Item
Fig.
No.
Control, indicator or connector
Function
reference.
ALARM MONITOR SM-D-936383(ALARM MONITOR)
1
SYSTEM FAULT Group CSS Indicator
Illuminates when fault occurs in CSS portion of system.
A unit fault indicator may also be illuminated and AUDIBLE
SIGNAL alarm will sound.
2
CSS TEMP Indicator
Illuminates when normal CSS temperature is exceeded.
3
OVERRIDE Indicator
Illuminates when any fault override switch (under access cover)
is placed in OVERRIDE position. Used to determine the
unit source of a CSS or RSS fault. The CSS or RSS in-
dicator will be extinguished thereby indicating a valid fault.
4
RSS Indicator
Illuminates when fault occurs in RSS portion of system.
A unit fault indicator may also be illuminated and AUDIBLE
SIGNAL alarm will sound.
5
AUDIBLE SIGNAL Group FAULT Switch
Selects operating or test mode for AUDIBLE SIGNAL alarm.
Normally set to the NORMAL position.
6
Audible Alarm
Sounds a tone when SYSTEM FAULT/CSS or RSS indicator
or SAFETY ALERT indicator illuminates. This fault/alert
sound can be disabled (turned off) when FAULT switch is
set to OFF.
7
POWER Group ON Circuit Breaker
Applies ac power to the unit when placed in the ON position.
8
AC Indicator
Illuminates when ac power is applied to the unit.
9
DC Indicator
Illuminates to indicate internal power supply is operational.
Illuminates simultaneously with ac indicator.
SAFETY ALERT Group
10
WAVEGUIDE INTERLOCK Indicator
Illuminates when waveguide connection opens at antenna
orthomode transducer, shelter antenna entry panel, or SHF
output flange of either power amplifier. The power supply
unit STATUS/WG/ANTENNA INHIBIT and HV INHIBIT
display indicators will be illuminated. The alarm monitor
RSS indicator will be illuminated and the audible alarm will
sound.
11
ANTENNA ELEVATION Indicator
Illuminates when antenna drops below a preset elevation angle.
Otherwise, functions same as WAVEGUIDE INTERLOCK
indicator above.
12
Fault Switches (under access cover)
Used for fault isolation purposes when a SYSTEM
FAULT/CSS or RSS indicator illuminates. In turn, each switch
is placed in the OVERRIDE position and then returned to
NORMAL (the OVERRIDE indicator will be turned on and off).
A valid fault is indicated if the CSS or RSS indicator is turned
off when a switch is in the OVERRIDE position. The switch
marking indicates the area of the fault. To enable the alarm
monitor to receive other faults, let the OVERRIDE condition
stand and return the AUDIBLE SIGNAL/FAULT switch to the
NORMAL position.
Table 3-11. LNA Control/Translator, Operator's Controls and Indicators
Item
Fig.
No.
Control, indicator or connector
function
reference.
CONTROL/TRANSLATOR, LNA SM-D-775327 (LNA CONTROL/TRANSLATOR)
1
HI HEAT Indicator
Illuminates to indicate high heat operation of the low noise
2
FAULT Indicator
Illuminates when fault occurs in LNA.
3
POWER Indicator
Illuminates when ac power is applied to the LNA.
4
ON LINE/LNA No. 1 Indicator
Illuminates to indicate that LNA No. 1 on-line (No. 2 is in
standby).
5
ON LINE Switch
Selects either of LNAs for on-line operation.
6
ON LINE/LNA No. 2 Indicator
Illuminates to indicate that LNA No. 2 is on-line (No. 1 is in
standby).
7
MONITOR Meter
Provides indication of applicable signal levels as selected by
MONITOR switch.
8
TRANSLATOR Indicator
Illuminates to indicate the translator 725 MHz source is
operational.
9
TRANSLATOR Switch
Places translator in operation when in the ON position.
10
POWER Indicator
Illuminates when ac power is applied in the unit.
11
POWER Switch
Applies ac power to the unit when in the ON Position.
3-23