TM 5-6675-306-14
Table 4-3. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
THEODOLITE
1.
THEODOLITE WILL NOT SEAT PROPERLY ON TRIPOD HEAD
Step 1.
Check alignment of the central fixing screw.
Restart central fixing screw (fig. 2-9).
Step 2.
Inspect tribrach assembly for defects.
Replace a defective tribrach assembly (fig. 1-2).
Step 3.
Tripod head defective.
Replace a defective head (fig. 4-6).
2.
THEODOLITE WILL NOT STAY ON LINE
Step 1.
Check theodolite for level.
Level theodolite.
(1) Position theodolite on tripod head and secure with central fixing screw (fig. 2-(9).
(2) Center circular level bubble using footscrews (fig. 2-9).
Step 2.
Plate level or collimation level out of adjustment.
a. Adjust plate level (fig. 2-15).
b. Adjust collimation level (fig. 2-16).
3.
LIGHTS ON VERTICAL AND HORIZONTAL CIRCLES UNEQUAL OR ABSENT
Step 1.
Illumination lamp defective.
Replace lamp (fig. 3-2).
Step 2.
Batteries defective.
Replace batteries (fig. 3-2).
Step 3.
Horizontal or vertical circle illuminating mirror defective.
Replace mirror-(fig. 4-4).
4.
TRIPOD LEG WILL NOT LOCK IN POSITION
Leg clamping screws loose,
Tighten or replace screws (fig. 2-8).
5.
HORIZONTAL CIRCLE HARD TO MOVE
Circle drive knob out of adjustment.
Adjust knob (fig. 2-17).
6.
FOOTSCREWS TOO TIGHT OR LOOSE
Footscrews out of adjustment.
Adjust footscrews (fig. 2-18).
7.
TELESCOPE TURNS TOO HARD OR TOO EASILY
Telescope clamp not properly adjusted.
Adjust clamp (fig. 2-14).
Section VII. CARRYING CASE AND HAVERSACK
4-10. General
to clean parts is potentially dangerous to
personnel and property. Avoid repeated
The carrying case for theodolite is composed of the
and prolonged skin contact. Do not use
metal hood and base. The carrying case provides a
near open flame or excessive heat.
convenient means of carrying the theodolite in the field
Flash point of solvent is 100 0 F.-138
and serves as a dustproof and mositureproof container
F. (38 C.-59 C.)
for the instrument when it is in storage. The base has a
(a) Clean all metal parts with an approved cleaning
recess in the bottom which houses the desiccant
solvent and dry thoroughly.
container. The haversack is used to carry the theodolite
(b) Clean the carrying strap with saddle soap.
when the use of the carrying case is impractical.
4-11. Carrying Case
(c) Inspect the strap for cracks, breaks, and cuts.
Inspect for worn mounting holes and deterioration due to
a. Hood.
age. Inspect for enlarged mounting holes.
(1) Removal. Remove the hood (para 2-2).
(d) Inspect the lock pins for burrs and wear. Inspect
(2) Disassembly. Refer to figure 4-1 and
the locking levers and lever springs for burrs, bends,
disassemble the hood.
and crack. Inspect the hood for (dents, cracks, and
(3) Cleaning, inspection, and repair.
WARNING
holes. Inspect the bottom rim for out-of-round.
Dry cleaning solvent, P-D-680, used
4-3
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