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
1. (cont)
f. (cont)
be 2, 000 ohms or less. Slowly open
the cover on the first Receiver. Be-
fore the cover flanges clear the edge
of the housing, the meter indication
should change to over 100, 000 ohms.
Pull the TAS plunger all the way
out; the resistance should drop to
its former level. Close cover and
repeat test on remaining Receivers.
With Processor cover open, use a
straightedge across the housing to
hold TAS plunger down. Slowly
raise the straightedge to simulate
opening the cover. After a move-
ment of less than 1/4 inch (0.635
cm), the meter indication should
change to over 100, 000 ohms.
b. If the TAS on any unit fails, replace
the PC board in that unit.
(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.
(4)
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)
To replace the PC board, orient
the board so that terminal strip
TB1 is adjacent to the conduit
connections. Secure the PC
board to the housing with
screws. Attach the wires to TB1.
5-6
