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Page Title:
Table 5-1. Troubleshooting Procedures - Continued |
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 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
2. (cont)
e. (cont)
Check settings of Detector gain and
Processor sensitivity controls to ensure
that they are not set to maximum (10).
a.
Disconnect wire from TB1-7 in the
f. Bad Processor PC
Processor. Set multimeter to ohms,
board.
and connect leads to the plus (+)
side of C13 and TB2-2.
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.
c.
If the meter does not sweep
between 0 and approximately 2,
500 ohms or if the needle moves in
a jerky or erratic manner, replace
the PC board.
(1)
To remove Processor PC board,
tag and disconnect wires from
TB1 and TB2. Remove screws
that secure PC board to chassis.
Lift PC board out of chassis.
(2)
To install new PC board, orient
board so the terminal strips are
adjacent to conduit entrance
holes. Secure the PC board to
chassis with screws.
Connect
wires to TB1 and TB2. Adjust
sensitivity control per instructions
in TM 5-6350-264-14/1.
a.
Disconnect wire from TB1-7 in the
g. Bad Detector PC
Processor. Set multimeter to ohms,
board.
and connect leads to the negative (-
) side of C3 and TB1-2 in the
Detector.
b.
Turn the gain control as far as it will
go in each direction. As the gain
control is turned, the meter should
sweep
between
0
and
approximately 2,500 ohms.
5-10
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