T M 5-6675-270-15
Table
3-2.
Preventive
Maintenance
Checks
and
Services
M-Monthly
AAfter operation
BBefore operation
Interval
QQuarterly
DDuring operation
WWeekly
Org.
Operator
Reference
Procedure
Item to be inspected
M
Q
W
A
B
X
Tripod
Inspect
tripod
for
serviceable
X
X
6
condition.
Inspect
tripod
acces-
sory
case
for
tears
and
other
damage.
Check
tripod
accessory
case
for
presence
of
components.
X
Inspect
box
for
presence
of
compo-
Battery
Box
X
X
7
nents.
Inspect
batteries
and
wir-
ing
for
serviceable
condition.
Check
rheostat
for
tight
and
clean
connections
and
for
proper
operation.
Inspect
light
for
serviceable
condi-
X
Hand
Light
X
8
X
tion
and
proper
operation.
Inspect
the
controls
and
instru-
X
X
X
9
Controls
and
ments
for
serviceable
condition.
Instruments
Check
for
proper
operation.
Note.
During operation observe for proper func-
tion, alinement, adjustment, and calibra-
tion.
--
TROUBLESHOOTING
Section IV.
3-8. Troubleshooting
3-7. General
This section provides information useful in
Malfunction switch may occur are listed in table
33. Each malfunction stated is followed by a list
diagnosing and correcting unsatisfactory opera-
tion or failure of the theodolite and its com-
of probable causes of the trouble. The corrective
ponents.
action recommended is described opposite the
probable cause.
Table
3-9.
Troubleshooting
Corrective
action
Probable cause
Malfunction
a. C a g i n g
knob
loose.
c. T i g h t e n
knob
setscrew
1.
Compass
circle
will
not
rotate
b. C o m p a s s
not
level.
b. Level
compass
freely.
Release
clamp
screw
2.
Compass
housing
will
not
rotate
on
Clamp
screw
locked.
compass
base.
c. T u r n
focusing
knob
until
sharp
3.
Compass
reference
mark
not
clear-
a. Compass
eyepiece
not
properly
image
is
obtained.
ly
visible.
focused.
b. Clean
external
lens.
b. E y e p i e c e
lens
dirty.
Adjust
screws
screws
in
compass
mounting
4.
Compass
assembly
will
not
seat
on
theodolite
mounting.
bridge
out
of
adjustment.
Tighten
screws
with
tripod
wrench
Leg
clamp
nuts
and
lockscrews
too
5.
Tripod
legs
will
not
lock
in
posi-
2-2b).
tion.
loose.
Tighten
wing
screws
Wing
screws
too
loose.
6.
Tripod
extension
leg
play
exces-
sive.
Bridge
screw
improperly
started
or
Restart
or
replace
bridge
screw
7.
Theodolite
will
not
seat
properly
on
2-2b).
tripod
head.
defective.
a. Level
the
instrument
a. Instrument
out
of
level.
8.
Instrument
will
not
stay
in
line.
b. Horizontal
out
of
ad-
b. C o r r e c t
justment.
c. A d j u s t
level
c. C o l l i m a t i o n
level
out
of
adjustment.
Adjust
level
Circular
level
out
of
adjustment.
9.
Circular
level
bubble
does
not
stay
in
center.
Collimation
slow
motion
screw
loose.
Adjust
screw
10.
Collimation
level
bubble
does
not
stay
in
center.
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