TM 9-4120-411-14
4.42 POTENTIOMETER (R2) REPLACEMENT - CONTINUED.
(4) Carefully position control box panel (3) in place and align mounting holes. Be sure no wires are pinched.
Secure with 16 flat washers (6), new lock washers (5), and screws (4).
(5) Carefully slide electrical assembly (2) into frame. Be sure no cables or wires are pinched. Secure with
eight captive screws (1).
4.43 PUSH BUTTON SWITCHES (S4 & S5) REPLACEMENT.
THIS TASK COVERS
a. Removal
b. Installation
INITIAL SETUP:
Tools
Mate rials/Parts
General Mechanics Tool Kit
Marker Tags (qty 3)
Lock Washers (qty 16)
a. Removal. See figure 4-42.
WARNING
Rotating parts and lethal voltage levels are used in operating the FDECU. Be sure
power source is disconnected. Injury or death can occur if connected to power
source.
(1) Shutdown the FDECU per paragraph 2.4 and disconnect it from power source.
(2) Loosen eight captive screws (1) and care fully pull the electrical assembly (2) out.
(3) Support control box panel (3) and remove 16 screws (4), lock washers (5), and flat washers (6). Carefully
pull control box panel away as far as wire leads will allow. Discard lock washers.
(4) Tag wire leads (7). Loosen two screws (8) then remove wire leads.
(5) Remove nut (9), push button switch (10), and sealing washer (11).
(1) Be sure sealing washer (11) is on push button switch (10) then install push button switch.
Align anti-
rotation key with notch in sealing washer and panel then secure using nut (9).
(2) Loosen two screws (8) then install three wire leads (7) using tags and wiring diagram figure 4-14. Secure
by tightening screws. Remove tags.
(3) Carefully position control box panel (3) in place and align mounting holes. Be sure no wires are pinched.
Secure with 16 flat washers (6), new lock washers (5), and screws (4).
(4) Carefully slide electrical assembly (2) into frame. Be sure no cables or wires are pinched. Secure with
eight captive screws (1).
4-104