TM-9-1240-400-34-P
TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1993
TM-9-1240-400-34-P - Page 161 of 344
TM 9-1240-400-34&P
Table 5-2.
DIRECT SUPPORT TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
b.
Check for worn worm shaft assembly.
Refer to page 5-29.
Replace worm shaft assembly.
Refer to page 5-29.
4.
CROSS-LEVEL CONTROL (2) REQUIRES TORQUE IN EXCESS OF 11.00 IN.-LB (1.24 N-m) TO ROTATE.
a.
Check V-bearing tightness.
Adjust torque.
Refer to page 5-29.
b.
Check for worn worm shaft and/or bearings.
Replace worm shaft and/or bearings.
Refer to page 5-29.
LEVEL ASSEMBLY
5.
CROSS-LEVEL BUBBLE (3) OR ELEVATION LEVEL BUBBLE (4) DOES NOT CENTER WITHIN 1
GRADUATION.
Observe visually.
Adjust level vials (3 and 4).
Refer to page 5-25.
6.
NO ILLUMINATION IN LEVEL VIALS (3 AND 4).
Observe visually.
a.
Replace burned out LEDs.
Refer to page 5-25.
b.
Replace defective variable resistor.
Refer to page 5-25.
c.
Clean or replace defective lens caps.
Refer to page 5-25.
COVER ASSEMBLY
7.
NO ILLUMINATION IN COUNTERS (5).
Observe visually.
a.
Replace burned out electronic component.
Refer to page 5-20.
b.
Replace defective variable resistor.
Refer to page 5-20.
5-7
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