Figure 2-54. Removal of printed circuit board.

TM 5-6675-250-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Figure 2-54. 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, bums, or other

evidence of defects.

Replace a bad printed circuit board.

CAUTION

To avoid damage to the electrical connectors, alternately tighten each of tbe two attaching

screws.

(1). Install a good printed circuit board, but do not tighten mounting screws. Connect the two

electrical connectors and secure by tightening two screws. Fasten ten screws that secure printed

circuit board to mounting brackets.

(2). Install electronic control panel assembly in case and secure with eight captive screws.

Step 2. Check for a defective ECU.

Replace existing ECU with a ECU that is operable, by disconnecting and connecting power cables (fig. 2-55).

2-46,