TM 11-5855-250-12&P
CHAPTER 3
OPERATING INSTRUCTIONS
Section I. CONTROLS AND INDICATORS
3-1. General
This section describes the switches and the indicator
Control or Indicator
Function
light common to Control, Searchlight C-7163/VSS-1(V)
Pos
Function
and Control, Searchlight C-7164/GSS-14(V). It also
alarm system is actuated by higher-than-
covers the controls and indicators on the MT-
normal temperature within xenon lamp
3900A/GSS-14(V). On the AN/GSS14(V) the main
cooling system.
power switch and the emergency override switch are
WARNING
located on the control box. On the AN/VSS-1(V), the
Continued
operation
of
main power switch (not shown) is located within the tank,
searchlight
when
high
temperature is indicated will
but is not part of the searchlight.
result in xenon lamp explosion,
causing damage to searchlight
3-2. Operator's Controls and Indicators
and possible serious injury to
a. Control Box (fig. 1-7 and 1-8).
personnel.
Control or indicator
Function
MAIN POWER SWITCH In the ON position, power is applied
(Control, Searchlight
to searchlight.
Pos
Function
C-7164/GSS-14(V))
WARNING
SEARCHLIGHT power
STANDBY
Xenon lamp is illumi-
switch
nated but light is not
To prevent xenon lamp explosion
emitted from searchlight.
and possible injury to personnel
ON
Light is emitted from
and equipment, set the main
search light.
power switch to OFF only after
Mode SELECTOR
IR FOCUS
Searchlight emits nar-
blower motor within searchlight
SWITCH
row beam of infrared
subassembly has stopped.
light.
Emergency override
In on position (against spring action),
IR WIDE
Searchlight
emits
switch
wide beam of infrared
(Control, Searchlight
xenon lamp can be illuminated
light.
C-7164/GSS-14(V))
even though vehicle engine is not
BO
Searchlight is placed
operating.
in blackout condition;
In OFF position, xenon lamp can be
xenon
lamp
is
illuminated only if the vehicle engine is
illuminated but light is
operating properly.
not
emitted
from
CAUTION
searchlight.
Do not operate searchlight with
VIS WIDE
Searchlight
emits
the emergency override switch set
wide beam of visible
to on unless it is absolutely
light.
necessary. Damage to the vehicle
VIS FOCUS
Searchlight
emits
battery system may occur.
narrow
beam
of
visible light.
NOTE
OVER-
DRIVE
Intensity of either
Refer to TM 11-2300-351-15-3 for information
visible or infrared light
concerning the MT-3900/GSS-14(V).
is
increased
by
Control or indicator
Function
approximately
50
percent
for
17.5
Azimuth handwheel
Adjusts searchlight in azimuth when
seconds 2.5. (Red
azimuth engagement lever is
indicator light glows.)
engaged.
Indicator light
Indicator light glows when searchlight
Elevation handwheel
Adjusts searchlight elevation.
is placed in overdrive mode of
Elevation brake
Locks searchlight in elevation.
operation,
or
when
high-
handwheel
temperature
Elevation scale setscrew
Prevents elevation scale from sliding
once it has been set.
Azimuth set latch
Prevents azimuth scale from sliding
once it has been set.
Scale illumination switch
Controls lamps used to illuminate
scales and level.
Fuse
Provides overcurrent protection for
3-1
