Table 2-1. Troubleshooting - Continued
TEST OR INSPECTION
Figure 2-14. Removal of MODE SELECT switch.
(10). Install new switch in panel assembly and secure with attaching parts. Connect and solder
electrical leads to switch in accordance with the identification tags on the electrical leads.
To avoid damaging the electrical connectors, alternate tightening each of the two screws during reassembly.
(11). 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.
(12). Place edge-lighted panel (fig. 2-13) over connector, seat properly and secure with five mounting
(13). Install BIAS control locking and BIAS knob on switch shaft. Secure BIAS knob by tightening
setscrews (fig. 2-12).
(14). Install TEST SELECT knob on shaft with pointer at source voltage position. Install MODE
SELECT knob on shaft with pointer at GC position. Secure each knob by tightening setscrews
(15). Install electronic control panel assembly in case and secure with eight captive screws.
2. MODE SELECT SWITCH CAN BE ROTATED COUNTERCLOCKWISE FROM GC, BRAKE OR PWR OFF POSITIONS
Step 1. Knob rotates on switch shaft. Knob setscrews loose or switch shaft worn. Tighten two setscrews in knob.
a. Loosen the eight captive screws (fig. 2-15) and lift the electronic control panel assembly from