TM 5-6350-264-14&P-8
NAVELEX EE181-AA-OMI-090/E121 SA-1954
T.O. 31S9-2FSS9-1-8
Table 5-1. Troubleshooting Procedures-Continued
Trouble
Probable cause
Corrective action
1. (cont)
a. (cont)
b. If these indications are not correct,
connect meter leads to TB1-2 and
pin 4 on PC board. With switch
S1 in no-alarm position, meter
should indicate 0 ohms.
c. If these indications are not correct,
replace switch S1.
(1) To remove S1, tag the wires;
and using a soldering iron of
50 watts maximum, unsolder
and remove the wires from the
pins on the PC board. Discon-
nect red wire from TB1-2.
(2) To replace S1, connect wires to
pins on the PC board, using a
soldering iron of 50 watts max-
imum. Install a crimp lug on red
wire and connect it to TB1-2.
b. Bad PC board
a. If switch S1 is good,
set multimeter to
ohms and check between TBi-1 and
pin 4 on PC board. With switch S1
in the normal position (no-alarm),
meter should indicate 0 ohms. Op-
erate S1, and meter indication should
change to infinity.
b. If these indications are not correct,
replace the PC board.
(1) To remove PC board, remove
screws that secure the PC board
to the relay bracket. Tag the
wires, and use a soldering iron
of 50 watts maximum to remove
them from the PC board termi-
nals.
(2) To replace PC board, use a solder-
ing iron of 50 watts maximum
to solder wires to PC board term-
inals. Secure PC board to relay
bracket with screws.
5-5
