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Page Title:
Table 5-1. Troubleshooting Procedures-Continued |
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 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
2. (cont)
a. (cont)
NOTE
Before troubleshooting the LAS, re-
move all components from chassis
as follows: Tag and disconnect from
TB1. Insulate wires removed from
TBI-1, TB1-6, and TB1-7. Remove
the nut and lock washer from switch
S1, and push the switch into the
chassis. Push the LED into the chas-
sis. Remove component mount-
ing plate screws. Remove plate
and all components from chas-
sis. Connect patch cable between
wire removed from TB1-7 and
terminal TB1-7. Connect patch
cable between wire removed from
TB1-8 and terminal TB1-8. Re-
move screws securing PC board
assembly. Remove screws sec-
uring reset switch (S2). Move
these two parts aside to provide
working space.
a. Disconnect wire from TB1-7. Set multi-
meter to ohms, and check between
TB1-2 (red wire) and pin 4 (yellow
wire) on PC board. With the duress
alarm in the normal position, the
meter should indicate 0 ohms. Op-
erate the duress alarm switch (S1).
The meter indication should change
to infinity.
b. If the 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. Disconnect red wire from
TB1-2.
5-7
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