NAVELEX EE181-AA-OMI-090/E121 SA-1954
Troubleshooting procedures listed in table 5-1 may require more than one person to
perform corrective action.
Covers should be removed as necessary to perform troubleshooting procedures.
Never disconnect a wire without first marking that wire to assure proper reconnection.
Table 5-1. Troubleshooting Procedures
1. Constant alarm.
a. Bad duress alarm
When power is on, do not short
test points to chassis or other
test points, or damage may re-
Before troubleshooting the LAS, remove all
components from chas- sis as follows: Tag
and disconnect wires
TB1-1, TB1- and TB1-7. Remove the nut
and lock washer from switch S1, and push
the switch into the chassis. Remove
Remove plate and all components from
chassis. Connect patch cable be- tween
wire removed from TB1-7 and terminal
TB1-7. Connect patch cable between wire
re- moved from TB1-8 and terminal TB1-8.
Remove screws securing PC board
assembly. Remove screws securing reset
switch (S2). Move these two parts aside to
provide working space.
a. Set multimeter to ohms and connect leads to
TB1-1 and TB1-2. Meter should indicate 0
ohms. Operate duress alarm switch (S1).
Meter should indicate infinity or open