TM 5-6675-307-14
Section VI. TROUBLESHOOTING
4-11. Scope
is not listed, or is not corrected by listed corrective
a. This section contains troubleshooting or
actions, you should notify higher level maintenance.
c. Table 4-3 lists the common malfunctions that
malfunction information and tests for locating and
you may find during the operation or maintenance of the
correcting most of the troubles which may develop in the
theodolite or its components. You should perform the
theodolite. Each malfunction or troubles symptom for
test/inspections and corrective actions in the order
an individual component, unit, or system is followed by
listed.
a list of tests or inspections necessary for you to
NOTE
determine probable causes and suggested corrective
If you have a malfunction which is not
actions for you to remedy the malfunction.
b. This manual cannot list all possible malfunctions
listed in this table, notify the next higher
level of maintenance
that may occur or all tests or inspections, and corrective
actions. If a malfunction
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
THEODOLITE
1
TRIPOD EXTENSION LEGS WILL NOT LOCK IN POSITION
Loose or defective extension leg wing nuts.
Tighten or replace wing nuts.
2
THEODOLITE WILL NOT SEAT PROPERLY ON TRIPOD BASE PLATE
Step 1
Locking screw improperly started.
Restart locking screw.
Step 2
Tribrach or base plate mating surfaces dirty.
Clean surfaces.
Step 3
Defective tribrach
Replace tribrach.
3
THEODOLITE WILL NOT STAY ON LINE
Check theodolite level bubbles for level.
Level Theodolite as follows:
a.
Center circular level bubble with leveling screws.
b.
Unlock pinch clamp and turn alidade so that plate level is parallel to aline joining any two leveling
screws and lock pinch clamp.
c.
Turn both leveling screws that are parallel with plate level simultaneously but in opposite direction
until plate level bubble is centered.
d.
Unlock pinch clamp, rotate alidade 90 degrees and lock pinch clamp. Adjust third leveling screw
until plate level bubble is centered.
e.
Unlock pinch clamp, rotate alidade 180 degrees and lock pinch clamp Adjust same leveling screw
as in step d, and remove one-half of any bubble displacement that may exist. Continue this
procedure until theodolite is exactly level.
4
PLATE LEVEL BUBBLE WILL NOT STAY CENTERED
Inspect the plate level, the bubble should be in the center.
Adjust plate level bubble as follows:
a
Center circular level bubble using leveling screws.
b
Position theodolite so that plate level bubble is as close to center as possible.
c
Correct one-half of plate level bubble error with leveling screws.
d
Adjust plate level capstan nuts until other half of error is removed.
e
Turn theodolite 90 degrees and repeat steps c and d Continue until bubble remains centered in all
positions of the theodolite.
4-3
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