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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
T.O. 31S9-2FSS9-1-4
Table 5-1. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
3. (cont)
g. Bad Detector PC
a. Set multimeter to dc volts. Connect
board.
positive meter lead to TP MV and
negative meter lead to TP GND.
b. Meter should indicate 0 Vdc.
c. Tap conduit or mounting surface next
to each Detector.
d. After each series of taps, meter should
indicate about 11 3 Vdc and then
return to 0.
e. If this indication is not present at any
Detector, replace that 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. Con-
nect 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.
h. Loose ground
a. Set multimeter to ohms, and check
connections.
between TB1-9, TB2-9, chassis, and
conduit in the Processor. The meter
should indicate 0 ohms.
b. If the meter indicates any resistance,
check terminal strips and PC board
for damage contacts. Ensure that
all terminal connections, screws, and
conduit lock nuts are tight.
5-15
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