TM 55-1930-209-14&P-12
4-18.2.4.2 Repair
WARNING
Make sure telephone system is electrically dead before making repairs on station selector box. Open (OFF) and
redtag circuit breakers 3P14 and 10P13A7 with: "WARNING - DO NOT ACTIVATE. REPAIRS BEING MADE."
a. Buzzer pushbutton switch replacement
(1) Remove four screws securing telephone station selector box cover and remove cover.
(2) Tag and disconnect wires from switch
(3) Remove switch mounting hardware and remove switch
(4) Install new switch on cover plate.
(5) Reconnect wires
(6) Secure cover plate with four mounting screws.
(7) Make sure switch operates normally.
b. Station selector switch replacement
(1) Remove four screws securing telephone station selector box cover and remove cover plate.
(2) Tag and disconnect all wires from power amplifier terminal board.
(3) Remove Allen screw and selector knob from switch.
(4) Remove station selector switch from cover plate by removing three screws.
(5) Mount new station selector switch on cover plate. Mount selector knob and reconnect wires.
(6) Secure cover plate with four mounting screws. Make sure switch operates normally.
c. Power control module and power amplifier repair and replacement See paragraph 4-18.2.5.
4-18.2.4.3 Replacement
WARNING
Make sure telephone system is electrically dead before replacing telephone station selector box. Open (OFF)
and redtag circuit breakers 3P14 and 10P13A7 with: "WARNING - DO NOT ACTIVATE. REPAIRS BEING MADE."
a. Tag and unplug cables to telephone station selector box.
b. Remove four mounting screws securing selector box.
c. Remove box.
d. Install and secure box with four mounting screws.
e. Plug cables to box.
f. Make sure selector box operates normally.
4-18.2.5 Power control module and power amplifier. These components are located inside the station selector
box.
4-20
