Figure 2-40. 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.

(10). 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.

(11). Place edge-lighted panel over connector, seat properly and secure with five mounting screws.

(12). Install BIAS control locking knob and BIAS knob on switch shaft. Secure BIAS knob by

tightening setscrews.

(13). Install TEST SELECT switch knob on shaft with pointer at source voltage position. Install

MODE SELECT switch knob on shaft with pointer at GC position. Secure each knob by

tightening setscrews.

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

Step 5. Check for a defective test meter.

a. Depress PRESS to test SWITCH.

b. If meter fails to provide required indication, meter is bad.

Replace a bad test meter.

(1). Loosen the eight captive screws and lift the electronic control panel assembly from the case (fig.

TS 006279

Figure 2-40. Removal of ECU panel assembly.

(2). 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.

(3). Disconnect two electrical connectors (2A2J5 and 2A2J6) by unfastening two screws at each

connector.

(4). Unsolder the electrical leads and tag for identification.

(5). Remove three nuts and screws attaching tbe meter and remove from the electronic control panel

assembly.

(6). Install a new meter in tbe electronic control panel and secure with three nuts and screws.

(7). Connect and solder the electrical leads to the switch in accordance with the identification tags on

the leads.

2-32,