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Page Title:
Table 5-1. Troubleshooting Procedures-Continued |
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 TM 5-6350-264-14&P-5
NAVELEX EE 181-AA-OMI-060/E121 SA-1955
T.O. 31S9-2FSS9-1-5
Table 5-1. Troubleshooting Procedures-Continued
Trouble
Probable cause
Corrective action
2. (cont.)
c. Bad tamper alarm switch.
a.
Remove cover, and disconnect
wire from TB1-6. Set multimeter
to ohms and check TB1-5 and
TB1-6. Meter should indicate
over 100,000 ohms.
b.
Depress tamper alarm switch
(TAS) arm.
Meter indication
should change to less than 50
ohms.
c. If these indications are not correct,
replace PC board.
d. To remove the PC board, tag and
disconnect the wires from TB1.
Remove two screws that secure
the bias magnet and two screws
that secure PC board to the
housing Remove the PC board
e. To install new PC board, orient the
board so that the terminal strip is
on the side away from the Actuat-
ing Magnet. Secure the board to
the housing with two screws. Put
the bias magnet in place, and start
the two screws that secure it; but
leave these screws loose so the
bias magnet can be calibrated.
Connect the wires to TB1
f. To calibrate the bias magnet, set
the meter to ohms and connect the
leads to TB1-1 and TB1-2. Loosen
the two screws that secure the bias
magnet to the PC board. Close
the door or window. Slide the bias
magnet back and forth until the
meter indicates less than 50 ohms
g. Open the door or window 1/2 inch
(1.27 cm). The meter should indi-
cate less than 50 ohms.
5-8
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