Table 2-1. Troubleshooting - Continued

TM 5-6675-250-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

b. Place the TEST SELECT switch to servo CW position; verify that the theodolite rotates in a clockwise direction

when looking down on the GRU and verify that the TEST METER pointer is positioned in the green band of the

meter scale.

c. Place the TEST SELECT switch in the CCW position; verify that the theodolite rotates in a counterclockwise

direction when looking down on the GRU and verify that the TEST METER pointer is positioned in the green band

of the meter scale. If the theodolite fails to rotate in either direction the gearbox assembly is bad.

Replace the gearbox assembly.

(1). Remove tbe main connector housing cover by removing ten screws.

(2). Remove the gearbox assembly access cover by removing ten screws (fig. 2-33).

(3). Remove the three gearbox assembly mounting screws (fig. 2-33) and remove the gearbox

assembly.

(4). Disconnect the gearbox assembly electrical cable by rotating the connector mounting screws (fig.

2-33) in the counterclockwise direction. Alternate between the two screws every (2 to 3) turns.

The connector will be damaged if the technique is not followed. Remove the gearbox assembly.

2-25