NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-2. Troubleshooting Procedures - Continued
28 +2 vdc. Turn mode switch to
TEST/RESET and then to SECURE.
Set multimeter to dc volts and connect
positive meter lead to PC board A1-TP1
(brown), and negative lead to chassis
(ground). Turn mode switch to SE-
CURE and ensure that no alarms are
activated. Meter should indicate
18.5 to 21 vdc.
If meter indicates less than 1 vdc, turn mode
switch to ACCESS. Connect positive
meter lead to power supply TB2-3.
Meter should indicate 20 + 1 vdc. Con-
nect meter lead to TB2-5. Meter
should indicate 5 +0.25 vdc. Con-
nect meter lead to TB2-2. Meter
should indicate 28 +2 vdc.
If any of these indications are not correct,
turn off switch S1 on power supply.
Check wiring for poor or loose con-
nections, broken wires, or frayed in-
sulation. Repair or replace any bad
If wiring is good, replace 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 enclose-
ure. Tag and disconnect wires from
TB2 and TB4. Remove screws that
secure cover, and remove cover. Tag
and disconnect wires from TB1. Care-
fully remove screws that secure power
supply to side of CU enclosure. Be
careful not to drop it inside CU. Note
cable clamp under screw near TB4
(bottom front). Support power supply
and turn it so wires can be tagged and
disconnected from TB3 on bottom of