TM 5-6350-264-14&P-3
NAVELEX EE 181-AA-OMI-040/E121 R1860 M9443
TO 31S9-2FSS9-1-3
Table 5-1. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
3. (cont)
(cont)
(3)
Adjust the gain control per steps
in TM 5-6350-264-14/1.
4. No alarms
a. Bad Processor
a Remove wires from TBl-1 and TB1-2
PC board
in the Processor. Set multimeter to
ohms, and connect meter leads to
TBl-1 and TB1-2. Meter should
indicate about 110 ohms.
b. Remove the wire from TB1-7 in the
Processor. The meter indication
should change to over 100,000
ohms.
c. If the meter does not match these in-
dications, replace the Processor PC
board.
(1)
To remove Processor PC board,
tag and disconnect wires from
TB1 and TB2. Remove screws.
Remove PC board.
(2)
To install new PC board, orient
the board so the terminal strips
are adjacent to conduit entrance
holes. Secure the PC board to
the chassis with screws. Con-
nect wires to TB1 and TB2.
(3)
Adjust sensitivity control per
steps in TM 5-6350-264-14/1.
b. Bad Receiver
Set multimeter to dc volts Connect PC
board
positive meter
lead to TP MV and
negative meter lead to TB1-8 in the
Processor. The meter should indi-
cate 0 volts. Use a key ring with
four to six brass keys on it and
rattle the keys in front of the Re-
ceiver. The meter should deflect
when the keys are rattled. If meter
does not deflect after several trials,
replace Receiver PC board.
(1)
To remove Receiver PC board, tag
and remove the wires from TB1.
Remove screws holding the PC
board in the housing. Remove
the PC board.
5-16
