a. Remove side panel from hookset by removing four mounting screws.
b. Tag and disconnect wires from terminal board.
c. Remove hookset mounting screws and remove telephone handset station.
d. Install new telephone handset station and tighten mounting screws.
e. Remove four screws and remove side plate.
f. Connect tagged wires to terminal board and remount side plate.
4-18.2.2 Handset adapter module
4-220.127.116.11 Test and repair
a. With circuit breaker 3P14 of 24 Vdc power panel closed (ON), check voltage at handsetadapter module terminal
board (Figure 4-10) across points 1 ground (-) and 8 positive (+) for 24 Vdc.
b. Open (OFF) circuit breaker 3P14 at 24 Vdc power panel.
Make sure circuit breaker 3P14 is opened (OFF) before making continuity checks. Redtag circuit breakers 3P14
with "WARNING - DO NOT ACTIVATE - REPAIRS BEING MADE."
c. Check continuity of power line to handsetadapter module terminal board points 1 and 8.
d. If input voltage is 24 Vdc in step a and no signal is being received from handsetadapter module, do not repair
module. Replace handset adapter module as given in paragraph 4-18.2.2
a. Remove four mounting screws from side cover plate and remove side cover plate
b. Tag and disconnect wires from handset adaptor module
c. Remove two mounting screws and remove handset adaptor module
d. Install new handset adaptor module and connect tagged wires.
e. Remount side plate and tighten four mounting screws
4-18.2.3 Indoor speaker monitor
4-18.104.22.168 Test and repair
a. Test telephone power amplifier as given in paragraph 4-22.214.171.124.
b. Check continuity of speaker wire from power amplifier terminal board to speaker terminal block if circuit is open,
replace speaker wire.
c. If power amplifier and speaker wire check ok, do not repair speaker. Replace indoor speaker monitor as given in