NAVELEX EE 181-AA-OMI-060/E121 SA-1955
Table 5-1. Troubleshooting Procedures Continued
h. If the meter indicates more than 50
ohms, reposition the bias magnet
until the meter does indicate less
than 50 ohms
i. Open the door or window 1 1/4 inch
(3.175 cm). The meter should indi-
cate over 100,000 ohms.
j. Repeat these steps until the meter
indicates less than 50 ohms with the
door or window open 1/2 inch(1.27
cm) or less, and indicates
over100,000 ohms when the door or
window is opened more than 1 1/4
inche (3.175 cm).
2. No alarm.
a. Bad PC board in Magnetic
a. With door or window open, discon-
nect wires from TB1-1 and TB1-2.
Set multimeter to ohms and
connect leads to TB1-1 and TB1-2.
Meter should indicate over 100,000
b. If the meter indicates less than 50
ohms across TB1-1 and TB1-2 with
the door or window open, adjust
the bias magnet inside the
c. To adjust the bias magnet, loosen
the two screws that secure it to the
PC board, and slide it back and
d. If the meter indication does not
change to infinity or if the opera-
tion appears to be erratic, replace
the PC board.
e. To remove the PC board, tag and
disconnect the wires from TB1.
Re- move two screws that secure
the bias magnet and two screws
that secure PC board to the
housing. Remove the PC board