Table 2-1. Troubleshooting - Continued
TEST OR INSPECTION
T S 006285
Figure 2-46. Gyroscopic reference unit power cable.
If the system operates correctly with the new GRU, this indicates the original GRU was bad.
Report a bad GRU to the next higher level of maintenance.
Step 2. Inspect printed circuit board for evidence of damage or failed components.
a. Loosen the eight captive screws and lift the electronic control panel assembly from the case (fig. 2-47).
Figure 2-47. Removal of ECU panel assembly.
b. Unfasten ten screws securing the printed circuit board to the mounting brackets and loosen the
board to obtain access to electrical connectors.
To avoid damage to the electrical connectors, alternately back-off each of the two attaching screws when removing the