Figure 2-88. Removal of printed circuit board.

TM 5-6675-250-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

(10). Press the anti-backlash setting tools into tbe index hole of the lower gear half and relax the

thumb and index finger.

(11). Connect the gearbox assembly electrical cable connector to the female receptacle on the housing

connector. Rotate the cable connector mounting screws in the clockwise direction, being careful

to alternate between tbe two screws after (2 to 3) turns.

(12). Place the cable betweeen the gearbox assembly mounting pads, so that it will be under the

gearbox when tbe gearbox is in final position.

(13). Rotate the follow-up shaft to the extreme clockwise position by turning theodolite mounting

plate.

(14). Install the gearbox assembly through the access and place it so that the mounting screw holes

are lined up.

(15). Apply sealent primer, MIL-S-22473, Grade N, Form R, to the threads, and allow to air dry.

Apply a small amount of thread locking sealant, MIL-S-22473, Grade N, Type II, to the

first few threads.

(16). Install the gearbox assembly mounting screws but do not tighten. Press tbe gearbox assembly

against the index pins (fig. 2-86) on the inner mounting pads and tighten the mounting screws

while maintaining the gearbox position.

(17). Remove tbe anti-backlash setting tool from the indexing hole.

(18). Install the gearbox assembly access and main connector housing cover. Secure each cover with

three mounting screws.

Step 7. Inspect printed circuit board for evidence of damage or failed components.

a. Loosen the eight captive ecrews and lift the electronic control panel assembly from the case (fig. 2-88).

CAUTION

TS 006337

Figure 2-88. Removal of printed circuit board.

b. Unfasten ten screws securing the printed circuit board to the mounting brackets and loosen the board to obtain access to

electrical connectors.

CAUTION

To avoid damage to the electrical connectors, alternately back-off each of the two attaching screws when removing the

connectors.

c. Disconnect two electrical connectors (2A2J5 and 2A2J6) by unfastening two screws at each connector. Remove printed

circuit board.

d. Inspect printed circuit board for visual evidence of cracked circuits, corrosion, burns, or other evidence of defects.

Replace a bad printed circuit board.

CAUTION

To avoid damaging the electrical connectors, alternate tightening each of the two screws during reassembly.