dow and lens for chips, cracks, and
(3) Install the micrometer circle illumination
etchings.
prism (par. 99).
(3) Inspect the inner vertical axis for
(4) Install the plate level (par. 97).
excessive wear, burs, and damaged
(5) Install the horizontal circle housing
threads.
(4) Remove all burs. Replace all defective
parts that cannot be repaired.
(6) Install the horizontal, vertical, and
collimation slow-motion screws (par. 108).
c. Reassembly and Installation.
(1) Refer to figure 72 and reassemble and
(7) Install the telescope axis bearings
install the inner vertical axis and U-
(pars. 122 and 124).
standard.
(2) Install the vertical circle illumination prism
Section XVII. ILLUMINATION SYSTEM
127. General
c. Reassembly. Refer to figure 73 and reassemble
The illumination system consists of two light
the battery box assembly.
housings and a battery box with a rheostat to control the
intensity of light illuminating the horizontal, vertical, and
129. Light Housings, Connector Cable, and Hand
micrometer circles. A hand light that plugs into the
Light
battery box is also provided for general external lighting
purposes.
a. General. When not in use the light housings are
stowed in the accessory case, and the hand light and
128. Battery Box Assembly
connector cable are stowed in the battery box.
b. Disassembly.
Refer to figure 74 and
a. Disassembly.
Refer to figure
and
disassemble the light housings, connector cable, and
disassemble the battery box assembly.
hand light.
b. Cleaning, Inspection, and Repair.
c. Cleaning, Inspection, and Repair.
(1) Clean all metal parts with an approved
(1) Clean all metal parts with an approved
cleaning solvent and dry thoroughly.
cleaning solvent and dry thoroughly.
(2) Inspect the lamps for defects. Inspect all
Wipe all corrosion from terminals and
electrical contacts for breaks, wear, and
contacts. Wipe dirt and other foreign
corrosion. Inspect the light housing glass
matter from cables, lamp trunk, springs,
filter for damage.
washers, and rheostat.
(2) Inspect the cables and contacts for
(3) Inspect insulation for cracks, wear, and
cracked, swollen, or damaged insulation,
damage. Inspect the electrical cable for
broken wires, and defective terminals.
breaks and frayed insulation. Inspect the
Inspect the springs for bends, breaks, and
cable connectors for breaks and defective
fatigue.
terminals.
(3) Inspect the lamp trunk for cracks and
(4) Inspect the housings and tubes for dents,
other damage. Inspect the rheostat for
rust, burs, and other defects.
improper operation and other damage.
Inspect the sockets for cracks and wear.
(5) Remove all burs and straighten minor
Inspect the springs for bends, breaks, and
dents. Replace all defective parts that
fatigue. Inspect the contacts and slide
cannot be repaired.
lever for wear, burs, and bends.
(4) Inspect the battery box for dents, cracks,
and defective mounting bracket, clamps,
d. Reassembly. Refer to figure 74 and reassemble
and carrying strap.
the light housings, connector cable, and hand light.
(5) Remove all burs and straighten minor
dents. Replace all defective parts that
cannot be repaired.
AGO 5078A
88
