Cleaning of Mechanical Parts, Electrical Contacts, and Lenses

TM 11-6760-238-34

d. Place a sheet or paper approximately 6 inches

cannot penetrate. If the solvent is taken

above and perpendicular to the beam of light emanatmg

internally,

consult

physician

from the lens barrel, and focus the beam of light or the

immediately.

a. Mechanical Parts and Electrical Contacts.

sheet by adjusting the lens barrel. Care should be

exercised not to focus the filament of the lamp by

(1)

To remove grease or dirt from

mistake. Correct adjustment is obtained when a sharp

mechanical parts or electrical contacts, wipe the area to

point of light is obtained on the sheet. Incorrect focus is

be cleaned with a cloth moistened with cleaning

evident by the presence of the shadow of the filament of

compound.

the lamp along with rings of light. If the light can be

(2) Wipe them dry with a clean lint-free cloth

adjusted to a sharp spot of light on the sheet, focus is

Do not allow lint or foreign matter to remain between

correct.

surfaces of any parts.

b. Lenses.

e. Tighten the two setscrews and liquid stake

(para 3-12).

(1) To remove dust, int, or other foreign

matter from lenses, use a soft bristled brush to loosen

3-10. Cleaning of Mechanical Parts, Electrical

and remove foreign matter from the lenses. Use a small

Contacts, and Lenses

syringe to blow loose particles from the lens area.

WARNING

CAUTION

Adequate ventilation should be provided

Do not use lens tissue containing

while

using

TRICHLOROTRIFLU-

silicone. Avoid excessive use of lens

ORETHANE. Prolonged breathing of

cleaner.

vapor should be avoided. The solvent

should not be used near heat or open

(2) Moisten a wad of lens tissue with lens

flame; the products of decomposition

cleaner and wipe the outer surfaces of the lens with a

are toxic and irritating.

Since TRI-

gentle circular motion from edge to center. Change the

CHLOROTRIFLUOROETHANE

dis-

surface of the lens tissue that touches the glass with

solves natural oils, prolonged contact

each stroke to avoid reusing any part of the tissue. Use

with skin should be avoided. When

as many tissues as necessary.

necessary, use gloves which the solvent

Figure 3-3. Light source focus adjustment.

3-10