4-220.127.116.11 Test and repair
With 24 Vdc circuit breaker 3P14 closed (ON), check that power amplifier is properly operating per telephone
power control module and power amplifier operation.
Try operation of a different headset that has tested ok.
Remove headset station cover and check for loose or broken wires. Repair or replace if any faults found.
Disconnect power from power control module at ON/OFF switch.
Disconnect and tag wires from power amplifier terminals 1, 3, 6, and 8. Tag and disconnect wires from headset
terminals 1, 3, 6, and 8 (see Figure 4-10).
Check continuity of wires 1 to 1, 3 to 3, 6 to 6, and 7 to 8.
Continuity may be checked by tying two wires together and testing for a closed circuit at the other
end of the two wires.
If an open circuit exists, make continuity check at nearest junction box until open circuit is localized and repair or
If wires check ok, replace headset station.
Remove jack box cover plate from telephone headset station.
Remove faulty headset station by removing two mounting screws.
Tag and disconnect wires from headset station (see Figure 4-10).
Connect tagged wires at their proper positions to the new headset station.
Mount new headset station with two screws and mount cover plate.
4-18.2.8 Strobe light
Close (ON) circuit breaker 10P13A7.
b. Push buzzer switch on telephone station selector box.
c. Position station selector switch on telephone station selector box to ROWPU space 2 for strobe light station
mounted on overhead in center of ROWPU space. Position switch to Void 4 Port and Starboard Station 6 for
strobe light located In Void 4 Port or Void 4 Starboard.
d. If strobe light does not light, check bulb. Replace if bad as given in paragraph 4-18 2.8 2. If bulb is good, go to
e. Check voltage at strobe light.
f. If voltage is 115 Vac, replace strobe light as given in paragraph 4-18 2.8.3. If voltage is not 115 Vac, check
continuity of wires to buzzer. If open circuit exists, replace wire. If continuity exists, check station selector switch
on telephone station selector box as given in paragraph 4-18.2.4 1.