NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-2. Troubleshooting Procedures - Continued
Bad PC board A8,
Turn on switch S1 on power supply.
or mode switch
Depress TRANSMITTER RESYNC
switch S2. Wait about 5 minutes
for system to stabilize. During
5-minute stabilization period, check
power supply. Set multimeter to
dc volts and connect negative lead
to chassis (ground). Connect posi-
tive lead to power supply, TB2-3.
Meter should indicate 20 ±1 vdc.
Connect positive lead to TB2-5.
Meter should indicate 5 ±0.25 vdc.
Connect lead to TB2-2. Meter
should indicate 28 ±2 vdc. Turn
mode switch to TEST/RESET and
then to SECURE.
Set multimeter to dc volts and connect
positive lead to J8-18 and negative
lead to chassis. Meter should in-
dicate 28 ±2 vdc.
(1) If meter indication is not correct
at J8-18, connect positive meter
lead to power supply TB2-2.
Meter should indicate 28 ±2 vdc.
(2) If meter does not indicate 28 ±2 vdc
at TB2-2, replace power supply.
(3) 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 it to remove
from bottom of CU enclosure.
Tag and disconnect wires from
TB2 and TB4. Remove screws
that secure cover; remove
cover. Tag and disconnect wires
from TB1. Carefully 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). Sup-
port power supply and turn it