Probable cause
Possible remedy
36. Plate Level Bubble Does Not Stay in Center
Illumination lamp defec-
Replace lamp (par. 31).
Probable case
Possible remedy
tive.
Plate level out of adjust-
Adjust the level (par. 16).
41. Illumination System Faulty or Fails To Function
ment.
Probable cause
Possible remedy
37. Collimation Level Bubble Does Not Stay in
Batteries defective ..............Replace the batteries (par.
Center
Probable cause
Possible remedy
42. Tripod Legs Will Not Lock in Position
Collimation level out of Adjust the level (par. 16).
Probable cause
Possible remedy
adjustment.
Leg clamping screws
Tighten or replace screws
38. Telescope Crosslines Will Not Focus
loose or defective.
Probable cause
Possible remedy
43. Horizontal Circle Hard To Move
Telescope eyepiece defec- Replace the eyepiece (par.
Probable cause
Possible remedy
tive.
50).
Circle drive setting pinion Adjust circle drive (par.
39. Circle and Micrometer Images Will Not Focus
out of adjustment.
16).
Probable cause
Possible remedy
44. Leveling Screws Too Tight or Too Loose
Microscope eyepiece de- Replace the eyepiece (par.
Probable cause
Possible remedy
fective.
50).
Leveling screws too tight
Adjust the screws (par. 16).
40.
Lights on Vertical and Horizontal Circles
or too loose.
Unequal or Absent
45. Telescope Turns Too Hard or Too Easily
Probable cause
Possible remedy
Probable cause
Possible remedy
Horizontal circle or
Replace
the mirror (par.
Vertical clamp screw
Loosen clamp screw.
vertical circle illuminat-
56).
improperly set.
ing mirror defective.
Section VI. CARRYING CASE AND PACK RACK
46. General
(3) Cleaning, inspection, and repair.
The carrying case for the theodolite is composed of
(a) Clean all metal parts with an approved
the metal hood and base. The carrying case provides a
cleaning solvent and dry thoroughly.
convenient means of carrying the theodolite in the field
(b) Clean the strap with saddle soap.
and serves as a dustproof and moistureproof container
(c) Inspect the straps for cracks, breaks, and
for the instrument when it is in storage. The base has a
cuts. Inspect for worn mounting holes and
recess in the bottom which houses the desiccant
deterioration due to age.
container and provides storage for the screwdriver,
(d) Inspect the lever pins for burs and wear.
24and 40-power telescope eyepiece assemblies, and
Inspect the locking levers and lever
illumination light housings. The pack rack is used to
springs for burs, bends, and cracks.
carry the theodolite, in its carrying case, when use of the
Inspect for enlarged mounting holes.
carrying case alone is impractical.
(e) Inspect the hood for dents, cracks, and
47. Carrying Case
holes. Inspect the bottom rim for out-of-
a. Hood.
round.
(1) Removal. Remove the hood (par. 7).
(f) Remove all burs from the lever pins,
(2) Disassembly.
Refer to figure 29 and
locking levers, and lever springs.
disassemble the hood.
Straighten minor dents. Remove all
AGO 5078A 39