TM 5-6675-312-14
Table 5-1. Troubleshooting (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. LIGHTS ON VERTICAL AND HORIZONTAL CIRCLES UNEQUAL OR ABSENT
Step 1.
Plug-in lamp defective. Repair plug-in lamp (see fig. 3-3).
Step 2.
Batteries defective. Replace batteries (see fig. 2-14).
Step 3.
Illuminating mirror defective. Replace theodolite and tribrach assembly.
4. TRIPOD LEG WILL NOT LOCK IN POSITION Leg clamping screws loose. Tighten screws (see fig. 4-7).
5. HORIZONTAL AND VERTICAL DRIVE SCREWS HARD TO MOVE
Horizontal and/or vertical screw
assemblies defective. Replace theodolite and tribrach assembly.
6. FOOTSCREWS TOO TIGHT OR LOOSE Footscrews defective. Repair tribrach assembly (para. 5-13).
7. THEODOLITE TURNS TOO HARD OR TOO EASILY
Horizontal clamp not fully released. Release horizontal
clamp (see fig. 2-1).
8. TELESCOPE ASSEMBLY TURNS TOO HARD Vertical clamp not fully released. Release vertical clamp (see
5-4
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