(4) When a system fault is displayed, the operator
However, the fault will be displayed on the affected
also will note any unit fault displays. In the appropriate
transmit system units and, if a safety-related fault, also
CSS or RSS group of fault switches, the operator can
on the alarm monitor.
momentarily place each fault switch to the OVERRIDE
(2) The antenna control alarm input (ANT
position. The switch that turns off the (RSS or CSS)
TRACK) is hardwired directly to the alarm monitor so no
SYSTEM FAULT indicator identifies the unit sending the
on-line selection is required.
d. CSS Only Faults. The on-line MUX is selected
alarm. The switch may be placed to the OVERRIDE
position to clear the system fault display.
at the DATA patch panel by patch cabling. The fault
(5) In some instances, a system alarm may
input line of the off-line or standby MUX must be
be initiated by more than one alarmed unit in the RSS or
disabled by placing the appropriate fault switch to the
CSS group. Activating the fault switches as in (4) above
will not clear the system fault display. The operator then
must place, and leave, more than one fault switch in the
OVERRIDE position until the correct combination clears
When testing the AN/FCC-98 use special test
the system fault display.
cable SM-C-983209 for signalling test with
c. RSS Only Faults.
BITE otherwise equipment damage may
(1) The alarm monitor will recognize alarm
inputs from only the selected on-line PA in the RSS. The
on-line PA is selected by the position of the transmit
e. RSS and CSS Faults. The on-line modem,
waveguide switch. The alarm monitor will recognize
along with the associated downconverter, are selected
transmit system faults from the on-line PA only when
by patch cabling on the IF patch panel. The fault input
it is in the operate condition (power supply OPERATE-
line of the off-line or standby modem must be disabled
STANDBY switch to OPERATE). When the on-line PA is
by placing the appropriate fault switch to the OVERRIDE
in a standby condition (power supply to STANDBY) and a
fault is generated, the audible alarm will not sound and
no RSS fault will be displayed on the alarm monitor.
Section VI. MAINTENANCE OF ANTENNA CONTROL C-10273 AND REMOTE CONTROL UNIT
procedures for testing and fault isolation to a removable
item and for the removal and replacement of the items.
DANGEROUS VOLTAGES EXIST IN THIS
The test procedures are based on the use of built-in-test
EQUIPMENT. Do not attempt any removal
No additional support or test
or replacement unless the equipment is in a
equipment is required. Fault isolation procedures for the
non-operating condition and all power
comm track module (A12) are on figure FO-1.
circuit breakers on the power distribution
panel are in the OFF position.
controls and indicators. See figure 5-1 for location of
removable items. When it is necessary to remove and