NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-2. Troubleshooting Procedures - Continued
If audible signal device does not sound,
set multimeter to dc volts and con-
nect positive meter lead to power
supply TB3-3 and negative meter
lead to TB34.
If meter indicates 18.5 to 21 vdc, re-
place power supply.
(1) To remove power supply, pull main
circuit breaker to remove 120
vac from CU. Disconnect wires
from battery. As battery is
heavy, lift and turn to remove
it from bottom of CU enclosure.
Tag and disconnect wires from
TB2 and TB4. Remove screws
that secure cover, and remove
cover. Tag and disconnect wires
from TB1. Carefully remove
screws that secure power sup-
ply to side of CU enclosure. Be
careful not to drop it inside CU.
Note cable clamp under screw
near TB4 (bottom front). Sup-
port power supply and turn it so
wires can be tagged and discon-
nected from TB3 on bottom of
(2) To install new power supply, re-
move cover, and turn unit so
TB3 is accessible. Support
power supply, and connect
wires to TB3. Turn power sup-
ply upright and position it over
standoffs on side of CU enclose-
ure. Note that cable clamp goes
under screw on bottom front of
power supply. Insert screws and
tighten to secure power supply.
Connect wires to TB1. Replace
cover and secure with screws.
Connect wires to TB2 and TB4.
Position battery outside CU en-
closure. Carefully insert battery
end first; turn and lower it into