Figure 2-58. Removal of electronic control unit assembly.

TM 5-6675-250-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

TS 006296

Figure 2-58. Removal of electronic control unit assembly.

If the system operates correctly with the new ECU, report the bad ECU to the next higher level of main-

tenance.

Step 3. Check for a defective GRU.

Replace existing GRU with a GRU that is operable, by disconnecting and connecting power cables (fig. 2-59).

TS 006298

Figure 2-59. Gyroscopic reference unit power cable removal.

If the system operates correctly with the new GRU, report the bad GRU to the next

higher level of maintenance.

10. RESET CIRCUIT INOPERATIVE WHEN RESET SWITCH IS PRESSED

Step 2. Check for defective RESET switch (2A2S5).

a. Loosen the eight captive screws and lift the electronic control panel assembly from the case (fig. 2-24).

Change 1

2-49