TM 9-1290-357-15
corrosion, rust, chipped or loose paint, or any
canvas cover is free of mold, breaks, tears, loose
other objectionable material.
stitching, etc.
4-20. Performance Test
e. Carrying Case M6A1.
Refer to paragraphs 2-8 and 2-9.
(1) All leather, canvas, metal, and wood
components shall be free from mold, breaks, tears,
4-21. Shop Inspection
loose stitching, rust, defective snaps or buckles,
a. The following sets forth the procedure to
and any other objectionable material.
be followed by direct support and general sup-
(2) The carrying case shall not be damaged
port maintenance shops in performing inspection
in any manner which would prevent the tripod,
of the aiming circle turned into the shops for
aiming circle, lamp, batteries, and instrument
repair.
light from being securely supported in their re-
b. Determine if the repair is within the scope
spective compartments without damage.
of the maintenance shop (refer to paragraph 4-22
4-23, 5-5 and 5-6).
(3) Carrying case surfaces will be free from
Section V. TROUBLESHOOTING
age to faulty components. Exercise care during
4-22. Purpose
troubleshooting to avoid further damage.
Troubleshooting is a systematic isolation and re-
medy of malfunctions and defective components
4-23. General
by means of symptoms and tests. Close adherence
For troubleshooting procedures performed at an
to the procedure covered herein will materially
organizational level refer to paragraph 3-11.
reduce the time required to locate trouble and re-
The troubleshooting procedure described in table
store the equipment to normal operation.
probable causes; then, taking necessary correct-
Caution: Operation of the materiel without a
ive action to remedy the malfunction.
preliminary examination can cause further dam-
Table 4-2. Troubleshooting
Item
Probable cause
Corrective
action
No.
Malfunction
a. Clean lamp contact and install
1.
Failure of instrument
a. Dirt, corrosion, etc. on lamp
contact. Lamp not properly
lamp properly. Replace lamp if
light M2 reticle light
installed or burned out.
burned out (paras 5-25
or hand light to
and 5-30).
illuminate.
b. Weak battery. Replace battery
b. Weak or dead battery.
if weak or burned out.
c. Clean spring and cap. Replace
c. Battery cap corroded, weak
weak spring. (paras 5-25
tension spring, etc.
and 5-30).
d. Clean contacts (paras
d. Corroded battery
e. Repair or replace switch.
e. Open circuit or short
in switch.
f. Replace wiring (paras
f. Defective wiring.
Replace vial. (paras 5-18
Foggy j cracked, or
Failure of visual
2.
and 5-39).
indication by the
broken vial.
telescope level vial.
4-8
