TM 5-6350-264-14&P-4
NAVELEX EE 181-AA-OMI-050/E121 DT546 M9442
TO 31S9-2FSS9-1-4
Table 5-1. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
3. (cont)
a. (cont)
c.
If the resistance indication is not present
or if the voltage indication is present,
replace the Detector PC board.
(1)
To remove Detector PC board, tag and
disconnect
wires
from
TB1.
Disconnect red and black pick-up
assembly wires from PC board.
Remove screws that secure board to
chassis. Remove PC board.
(2)
To install new Detector PC board,
orient board so the terminal strip is
adjacent to the conduit entrance hole.
Secure the board to the chassis with
screws. Connect wires to TB1, and
connect red and black pick-up
assembly leads to the marked
terminals on the board. Adjust gain
control per instructions in TM 5-6350-
264-14/1.
NOTE
BEFORE touching any gain or
sensitivity controls, note their
d. Gain or sensitivity
settings so that they may be
controls set too low.
returned to their original positions
after testing.
Check settings of Detector gain and
Processor sensitivity controls to
ensure that they are not set to
minimum (1).
a.
Disconnect wire from TB1-7.
Set
multimeter to ohms, and connect leads
e. Bad Processor PC
to the plus (+) side of C13 and TB2-2.
board.
b.
Turn the sensitivity control as far as it
will go in each direction.
As the
sensitivity control is turned, the meter
should
sweep
between
0
and
approximately 2, 500 ohms.
5-13