Figure 2-41. Removal of ECU panel assembly

TM 5-6675-250-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

CAUTION

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

(8). Install 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.

(9). Install electronic control panel assembly in case and secure with light captive screws.

6. HAND LAMP CIRCUIT INOPERATIVE

Step 1. Check for defective hand lamp.

a. Unscrew the lamp shield and remove the lamp.

b. Visually inspect the lamp for a burned filament.

Replace a bad lamp. Install a new lamp in hand lamp and install shield.

Step 2. Check for defective HAND LAMP switch (2A2S6).

a. Loosen the eight captive screws and lift the electronic control panel assembly from the case (fig. 2-41).

TS 006280

Figure 2-41. Removal of ECU panel assembly

b. Unfasten ten screws securing the printed circuit board to 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.

d. Use an ohmmeter and check continuity between pins 1 and 2 of switch 2A2S6.

If continuity is not present, replace a bad switch.

(1). Place Mode Select switch to GC position (fig. 2-42).

(2). place TEST SELECT switch to SOURCE VOLTAGE position.

2-33