NAVELEX EE181-AA-OMI-090/E121 SA-1954
Table 5-1. Troubleshooting Procedures - Continued
b. If LED does not operate properly, set
multimeter to dc volts; connect posi-
tive meter lead to top end of R1 (end
of R1 opposite pin 6) and negative
meter lead to TB1-8. With S1 in nor-
mal position, meter should indicate
20 vdc. When S1 has been operated
(duress alarm), meter should indicate
c. If these indications are correct, replace
LED. If trouble remains or indications
are incorrect, replace PC board.
(1) To remove LED, tag and carefully
unsolder wires from PC board.
Use a soldering iron of 50 watts
(2) To replace LED, turn flat spot on
side of LED toward 2 on PC
board. Carefully solder wires
to PC board, using a soldering
iron of 50 watts maximum.
(3) To remove PC board, remove screws
that secure the PC board to the
relay bracket. Tag the wires,
and use a soldering iron of 50
watts maximum to remove them
from the PC board terminals.
(4) To replace PC board, use a solder-
ing iron of 50 watts maximum to
solder wires to PC board terminals.
Secure PC board to relay bracket