NAVELEX EE181-AA-OMI-090/E121 SA-1954
Table 5-1. Troubleshooting Procedures-Continued
c. Bad tamper alarm
a. Inspect the cover to ensure that it is
flat, straight, and completely closed.
Open the cover and ensure that
there is no debris between cover
and chassis. Set multimeter to ohms
and connect leads to TB1-5 and TB1-6.
Meter should indicate infinity. De-
press the tamper alarm switch (TAS).
The meter indication should change
to 0 ohms.
b. If these indications are not correct, re-
place the TAS.
(1) To remove TAS, disconnect switch
wires from TB1-5 and TB1-6.
Remove screws that secure switch
mounting bracket to component
mounting plate, and remove mount
ing bracket. Remove nut and lock
washer from switch. Remove
switch from mounting bracket.
Use a soldering iron of 50 watts
maximum to remove wires from
(2) To replace TAS, set meter to ohms
and check switch terminals. Meter
should indicate 0 ohms with switch
depressed and infinity with switch
released. Use a soldering iron of
50 watts maximum to solder wires
to switch terminals. Insert switch
through hole in mounting bracket.
nut on switch
and tighten nut to secure switch.
Use screws to secure switch mount-
ing bracket and ground lug to com-
ponent mounting plate. Connect
switch wires to TB1-5 and TB1-6.
2. Nuisance alarms.
a. Bad duress alarm
When power is on, do NOT short
test points to chassis or other
test points, or damage may result.