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 TM 55-1905-223-24-18-2
e.
Remove pushbutton switch (11) and contact block (12).
f.
Remove pushbutton switch (13) and contact block (12).
g.
Remove dimmer knob (14) and potentiometer (15).
h.
Remove knob (16) mounting screws (18) and the ten layer rotary switch (17).
i.
Remove and tag wires from terminal board TB3 (1) and remove steering control P.C.B. (2).
j.
Remove three screws (22) and lockwashers (21) and remove rudder order P.C.B. (20).
k.
Remove transistor and heat sink unit (23).
l.
Remove diode (19).
REPAIR
Repair at this level of maintenance is by replacement of: steering control P.C.B. (2), lamps (5), rotary switches (8,
17), pushbutton switches (9, 11 and 13), rudder order meter (10), knob (14), potentiometer (15), rudder order
P.C.B. (20), transistor and heat sink unit (23) and diode (19).
ASSEMBLY
a. Install diode (19).
b. Install transistor and heat sink unit (23).
c. Install rudder order P.C.B. (20) and secure with three screws (22) and lockwashers (21).
d. Install steering control P.C. B. (2).
e. Install ten layer rotary switch (17), knob (16) and secure with mounting screws (18).
f. Install potentiometer (15) and dimmer knob (14).
g. Install contact block (12) and pushbutton switch (13).
h. Install contact block (12) and pushbutton switch (11).
i. Install pushbutton switch (9).
j. Install eight layer rotary switch (8), knob (7) and secure with mounting screws (6).
k. Install lamps (5).
l. Install rudder order meter (10) and mounting hardware.
REPLACEMENT
a. Connect electrical leads to the potentiometer (15), rotary switches (8, 17), pushbutton switches (9, 11
and 13) and rudder order meter (10) and remove tags.
b. Install steering control panel (3) in pilothouse control console.
c. Secure with four screws (4).
d. Restore electrical power to steering control panel assembly and remove tags.
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