TM 5-6350-264-14&P-10
NAVELEX EE 181-AA-OMI-110/E121 C-9412
T.O. 31S9-2FSS9-1-10
Table 5-2. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
4. (Cont)
g. Bad Audible
NOTE
Alarm
Circuitry
Ensure that there is no jumper
from TB4-1 to TB4-4. Discon-
nect AA wire from TB4-3. Dis-
connect green wire from TB4-1.
Connect jumper from TB4-3 to
TB4-4.
a.
Turn mode switch to TEST/RESET. Set
multimeter to dc volts and connect
positive lead to power supply TB4-1
and negative lead to TB4-2.
b.
If meter indicates less than 1 vdc, connect
positive meter lead to mode switch
S3, terminal 3-2, and negative lead to
chassis.
c.
If meter indicates less than 1 vdc, inspect
wiring from mode switch S3, terminal
3-2 to power supply TB2-5 for loose
or broken connections. Resolder any
bad connections.
d.
If meter indicates 5 +0.25 vdc, connect
positive meter lead to S3, terminal
3-4.
e.
If meter indicates less than 1 vdc, replace
mode switch, S3.
(1) To remove mode switch, turn off
switch S1 on top of power supply.
Remove large hex nut that secures
switch mounting bracket to inside
of CU door. Remove switch and
mounting bracket together. Be
careful not to lose switch arm
because it is not secured to
switch shaft. Remove spacer
and lock from door so no items
will be lost. Remove small hex
nut and lock washer that secures
mounting bracket and switch
stop to switch shaft. Remove
mounting bracket and switch
stop. Note that mode switch is a
three deck switch. Tag wires and
use a soldering iron of 50 watts
maximum to remove them from
switch terminals.
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