TM 5-6675-306-14
Section II.TROUBLESHOOTING
5-4.
Scope
actions. If a malfunction is not listed, or is not corrected
a. This section contains troubleshooting or
by listed corrective actions, you should notify higher
malfunction information and tests for locating and
level maintenance.
correcting most of the troubles which may develop in the
c. Table 5-2 lists the common malfunctions that
theodolite. Each malfunction or trouble symptom for an
you may find during the operation or maintenance of the
individual component, unit, or system is followed by a
theodolite or its components. You should perform the
list of tests or inspections necessary for you to
tests/inspections and corrective actions in the order
determine probable causes and suggested corrective
listed.
NOTE
actions for you to remedy the malfunction.
b. This manual cannot list all possible malfunctions
If you have a malfunction which is not listed
that may occur or all tests or inspections, and corrective
in this table, notify the next higher level of
maintenance.
Table 5-2. 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).
Step 4. Base plate defective.
Repair or replace base plate (fig. 6-1).
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.
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. 4-6).
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).
8.
CIRCULAR LEVEL BUBBLE DOES NOT STAY IN CENTER
Step 1. Circular level out of adjustment.
Adjust circular level (fig. 2-21).
Step 2. Circular level defective.
Replace circular level (fig. 5-4).
5-3
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