TM 5-4220-225-14
5-14. Communications Box (Cont).
(8)
Replace R3 potentiometer. (figures 5-16, 5-17, and 5-18).
(a)
Remove knob (para. 5-14(3)) and mounting hardware.
(b)
Remove and identify wires for reassembly.
(c)
Remove potentiometer.
(d)
Install potentiometer.
(e)
Solder wires to potentiometer.
(f)
Install knob (para. 5-14(3)) and mounting hardware.
(9)
Replace K1 relay. (figures 5-16, 5-17, and 5-18).
(a)
Remove relay.
(b)
Identify wires for reassembly.
(c)
Remove wires.
(d)
Attach wires to new relay.
(e)
Attach relay to component board.
(10)
Replace common mode assembly (66291). (figures 5-16, 5-17, and 5-18).
(a)
Remove setscrew and knob.
(b)
Remove nut seal securing relay switch R2 to front panel.
(c)
Gently slide common mode assembly up and out.
(d)
Identify wires for reassembly.
(e)
Remove wires.
(f)
Solder wires.
(g)
Slide new common mode assembly into position on relay switch R2.
(h)
Tighten nut seal.
(i)
Install knob with setscrew.
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