TM 5-6350-264-14&P-2
NAVELEX EE181-AA-OMI-030/E121 RT1161 M9443
T.O. 31S9-2FSS9-1-2
Table 5-1. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
2. (cont)
a. (cont)
(2)
To install new PC board, orient
the board so the terminal strips
are adjacent to the conduit en-
trance holes. Secure the PC
board to the chassis with screws.
Connect wires to TB1 and TB2.
d. If alarm continues, remove Processor
cover, and set meter to ac volts.
Check between balance TP and
reference TP. The meter should
fluctuate above and below some
point on the scale. If the meter
fluctuates more than 0.3 volts above
or below this point, disconnect the
wires from TB2-1 and TB2-2 and
reduce each Transceiver range-con-
trol setting to position 1.
e. If fluctuations cease, the problem is
air turbulence. Check possible
sources of turbulence, such as air
conditioners, heaters, ventilation
ducts, fans, doors, windows, and
cracks in floors, walls, or ceilings.
Such turbulence can be reduced by
baffling ducts and fans, securing
doors and windows, and caulking
cracks.
f. If fluctuations are in one direction
only, radio frequency interference
(RFI) in or near the secure area is
probably the source of trouble. To
locate sources of RFI, turn off, one
at a time, such items as intercoms
and paging units. Check for walkie-
talkies or other radios that may be
used in the area.
b. Motion caused by
Eliminate wildlife from secure area.
wildlife such as
rodents, birds,
or insects.
5-8