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Section III. GENERAL MAINTENANCE - TM-9-1240-369-340056
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TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
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Figure 2-20. "A" trigger (A76A2) schematic diagram.
TM 9-1240-369-34
Use a camel hair brush to remove loose
visual inspection. the system self-test is performed to
particles of dust  and lint from glass surfaces. Then.
insure the serviceability of the entire system.
wipe the surface in a circular motion using lens tissue-
(4) The complete inspection is performed for
either dry or moistened with methyl or ethyl alcohol. If
an initially received laser range finder system to insure
dirt, lint. or smears remain on the glass, wrap a piece of
that it is not damaged.  This inspection, including the
lens tissue around the end of an orange stick (or
system self-test, is also performed weekly to make sure
equivalent) to form a swab. Beginning at the center of
the system is maintained in a state of operational
the surface, swab with a (circular motion while applying a
readiness.
e. General Painting Instructions.  Visually inspect
light downward pressure. Gradually increase the radius
of the area being cleaned until the entire surface has
unit housings and attaching hardware for rust or
been covered.  If necessary, use a rubber syringe to
corrosion and missing, chipped or blistered paint. Small
blow off any remaining dust or lint.
areas of damaged paint may be touched lip as part of
(4) Other. Use a dry rag to remove loose dirt,
user preventive maintenance.  When painting with a
dust or debris. Flush off caked mud using clean water.
brush, apply the paint as issued or after thinning with not
c. Cleaning  Procedures  for  Cold  Weather
more than 5 percent by volume of thinner.
Operation.
(1) If the temperature is below 320 F, add
CAUTION
glycerin to cleaning water.  This will prevent it from
Optical elements, bearings, rubber, or
freezing on the part being cleaned and possibly
other components which might be
preventing normal operation of the laser system.
damaged by cleaning, masking or
(2) Alcohol, applied with a lens tissue, may be
paint must be removed from the units
used to clean glass surfaces if dry lens tissue does not
before proceeding.
work satisfactorily.
(1) Smooth surface and feather edges of
CAUTION
affected area with fine abrasive paper.
The optical elements of the laser
range finder are coated. Do not rub
WARNING
glass surfaces with rags or other
Toluol
solvent
is
toxic
and
materials  that  might  scratch  the
flammable.
Use only in a well-
coated surfaces and thereby degrade
ventilated area. Avoid prolonged or
system performance.
repeated breathing of the vapor.
Avoid prolonged or repeated contact
(3) If moisture has frozen on glass surfaces,
with the skin.
apply deicer or place the unit in a warm area until the ice
melts. Then pat dry the surface with clean absorbent
(2) Clean area with wiping rag dampened with
wiping rag. Clean with lens tissue when the surface is
toluol cleaning solvent.
dry.
d. Inspection.
CAUTION
(1) Conduct  a  visual  inspection  of  unit
Use masking tape to insure that no
housings and attaching hardware to make sure that all
paint is applied to the following:
units are in good condition. Ensure that no moisture is
countersinks,
counterbores,
bolt
trapped around the area of the window and ballistic dust
holes,  bearing  surfaces,  attached
cover on the receiver-transmitter unit.
surfaces, o-ring grooves, and those
(2) Replacement units should be substitute for
areas treated with solid film lubricant.
those found to be damaged or worn near or beyond
serviceable limits.  Dirt, grease, and foreign matter
(3)
Apply primer and paint to the affected area
should be removed from  all inspected surfaces.
according to instructions cited on the paint containers.
Preservatives and foreign matter should be removed
Air dry primer for 1/2 hour minimum.  Within 2 hours
from electrical connectors. Areas in which the paint is
after application of primer, apply one coat of paint.
scratched, chipped, or worn should be repainted.
f. Lubrication.
Maintenance tasks which are not authorized for the DS
and GS maintenance personnel should be referred to the
CAUTION
responsible maintenance activity.
Lubricant should never be applied to
(3) During the visual inspection, the laser
exposed surfaces because dust is
range finder is completely assembled and checked for its
likely
mechanical operating capability. After completion of the
2-39

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