4-8. Replacement of Indicator Lamps,
a. Turn the indicator lamps and jewel assem-
bly counterclockwise and remove them.
b. Pull the defective indicator lamp from the
c. Insert a new lamp into the socket and turn
Inspect the exteriors of the C8157/ARC and
the MT3802/ARC. The exterior surfaces should
d. To replace the jewel assembly, turn it clock-
be free of dust, dirt, grease, and fungus.
wise. Do not overtighten it, but be sure that its
a. Remove dust and loose dirt with a soft,
seal is amply compressed.
4-9. Repainting and Refinishing Instructions
When the finish on any metal parts of the equip-
ment has been badly scarred, damaged, or cor-
Adequate ventilation should be provided while
roded sand it lightly with fine sandpaper. Use
Prolonged breathing of vapor should be
#000 sandpaper and trichlorotrifluoroethane to clean
avoided. The solvent should not be used
the surface down to bare metal. Refer to applicable
near heat or open flame; the products of
cleaning and refinishing practices specified in TB
decomposition are toxic and irritating.
dissolves natural oils, prolonged contact
with skin should be avoided. When necessary,
use gloves which the solvent cannot penetrate.
If the solvent is taken internally, consult
Compressed air is dangerous and can cause
a physician immediately.
serious bodily harm if protective means or
methods are not observed to prevent a chip or
particle (of whatever size) from being blown
b. Remove grease, fungus, and ground-in dirt
into the eyes or unbroken skin of the operator
or other personnel. To be usable for cleaning,
from the eases; use a cloth dampened (not wet)
the compressed air source must limit the nozzle
pressure to no more than 29 pounds per square
inch gage (PSIG). Goggles must be worn at all
c. Clean the panels and switches of the C-
times while cleaning with compressed air. Do
not use compressed air to dry parts when
8157/ARC; use a soft, clean cloth, If dirt is diffi-
cult to remove, dampen the cloth with water. Use
a mild soap if necessary.