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 TM 55-1905-223-24-18-2
b. Remove hex head nuts (6) from mounting studs (7).
c. Remove power transformer (8).
d. Disconnect electrical cable (13) to electrical bell (11).
e. Remove hex head screw (10).
f. Remove electrical bell (11) from mounting bracket (12).
g. Insert key in keyhole (4) and open door (2).
h. Unplug electrical plug (19) from voltmeter (meter module) (18, Sheet 2).
i. Remove four retaining screws (17).
j. Remove meter module (18).
k. Tag and disconnect electrical leads to terminal board (22).
l. Remove ten retaining screws (20).
m. Remove power supply (21).
n. Unplug electrical plugs (24) from power transformer (battery charger transfer) (25).
o. Remove eight retaining screws (23).
p. Remove power transformer (25).
q. Tag and disconnect electrical leads at terminal blocks (26, 27).
r. Remove storage battery (28).
s. Tag and disconnect electrical leads (29) to zone modules (31).
t. Remove 12 retaining screws (30).
u. Remove zone modules (31).
REPAIR
Repair at this level of maintenance is by replacement of power transformer (isolation) (8), electrical bell
(11), voltmeter (meter module) (18), power supply (21), power transformer (battery charger transfer) (25),
storage battery (28), and zone modules (31, Sheets 1 and 2).
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