TM 11-5895-846-14
(a) No unit fault indication on the power
(29) Place the OPERATE-STANDBY switch to
the STANDBY position.
amplifier but the unit will be shut down.
(b) Power supply WG/ANTENNA INHI-
(30) Replace all fuses.
(31) Place the TEST-NORMAL switch (inside
BIT and HV INHIBIT indicators are illuminated.
the drawer) to the NORMAL position. Remove the LV
(c) Alarm
monitor
SAFETY
FUSE.
ALERT/ANTENNA ELEVATION indicator is illuminated.
(32) Reconnect the cable to connector J3 on
(d) Alarm monitor SYSTEM FAULT/RSS
the rear of the power supply. Replace the LV FUSE.
indicator is illuminated and audible alarm is sounding
(33) Replace the top cover and tighten all of
(refer to step (f) below).
the 1/4-turn fasteners.
(e) Place the power supply OPERATE-
(34) Close the power supply drawer and
STANDBY switch to the STANDBY position. Check the
tighten the eight captive screws on the front panel.
setting of the safety switch on the elevation readout
h. FIL INHIBIT and HV INHIBIT Status Indicators.
These indicators will be illuminated when the power
(f) Check for these additional fault
supply is placed in operation. If the FIL INHIBIT indicator
indications: a SCAN FAULT on the antenna control
is still illuminated for several minutes beyond the normal
(TRACK SIG LOSS also may be on) and a SYSTEM
5 minute delay, the problem is in the pulse synthesizer
FAULT/CSS on the alarm monitor. If these indications
module A4; remove and replace the module (para 5-
are displayed, the antenna control has failed; refer to
i.
WG/ANTENNA INHIBIT and HV INHIBIT
supply in the standby condition: the waveguide interlock
group is operating on-line, these indicators will be
has opened on the associated power amplifier. The
illuminated by a safety alert failure at any of the following:
following conditions/indications will be generated:
the flexible transmit waveguide interlocks at the antenna
(a) No unit fault indication on the power
and antenna entry panel, the waveguide interlock on the
amplifier.
front panel of the associated power amplifier, or if the
(b) Power
supply
WG/ANTENNA
antenna drops below a preset elevation angle. Any of
INHIBIT and HV INHIBIT indicators are illuminated.
these safety alert failures will shut down the on-line
(c) Alarm
monitor
SAFETY
power amplifier and its associated transmitter group.
ALERT/WAVEGUIDE
INTERLOCK
indicator
is
When this power supply transmitter group is in standby,
illuminated.
the indicators will be illuminated only if the waveguide
(d) No system/RSS fault indication on
interlock opens on the front panel of the associated
the alarm monitor and no audible alarm.
power amplifier. In addition, if this standby group is
operating, that is, driving the dummy load, the power
supply in the operate condition and driving the dummy
amplifier will be shut down. To locate a failed safety alert
load: the waveguide interlock has opened on the
item, compare actual indications and operating status
associated
power
amplifier.
The
following
with the following tabulation. Disable the audible alarm if
conditions/indications will be generated:
it is sounding.
(a) No unit fault indication on the power
(1) On-line transmitter group: one of the
amplifier but the unit will be shut down.
flexible transmit waveguide interlocks has opened or the
(b) Power
supply
WG/ANTENNA
waveguide interlock has opened on the on-line power
INHIBIT and HV INHIBIT indicators are illuminated.
amplifier. The following conditions/indications will be
(c) Alarm
monitor
SAFETY
generated:
ALERT/WAVEGUIDE
INTERLOCK
indicator
is
(a) No unit fault indication on the power
illuminated.
amplifier but the unit will be shut down.
(d) No system/RSS fault indication on
(b) Power supply WG/ANTENNA INHI-
the alarm monitor and no audible alarm.
BIT and HV INHIBIT status indicators are illuminated.
(e) Place the power supply OPERATE-
(c) Alarm monitor SAFETY ALERT
STANDBY switch to the STANDBY position and correct
/WAVEGUIDE INTERLOCK indicator is illuminated.
the failure.
(d) Alarm monitor SYSTEM FAULT/RSS
j.
Filament Voltage Adjustment.
The power
indicator is illuminated and audible alarm is sounding.
supply unit 6 volt filament voltage should be checked and
(e) Place the power supply OPERATE-
adjusted, if necessary, whenever any one of the following
STANDBY switch to the STANDBY position and locate
is replaced: power supply low voltage module A2 or
the open interlock.
filament module A18, or the PA klystron V1.
(2) On-line transmitter group: the antenna
has dropped below the preset safety-alert elevation
angle.
The following conditions/indications will be
generated:
5-15