TM 5-6350-264-14&P-2
NAVELEX EE181-AA-OMI-030/E121 RT1161 M9443
T.O. 31S9-2FSS9-1-2
Table 5-1. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
2. (cont)
g. (cont)
f. If voltage is below tolerance and wir-
ing is good, check slave Processor PC
board to verify that the red lead to
the frequency control transducer is
disconnected and insulated and that
a 0.01 f capacitor is connected
between TB2-5 and TB2-6. Set
multimeter to ohms and check be-
tween TB2-5 and cathode end of
CR1. Meter should indicate 0 ohms.
g. If modifications have been made cor-
rectly and voltage is below tolerance,
replace slave Processor PC board.
Ensure that modifications have been
made to this new board before instal-
lation.
h. Set multimeter to ac volts, and connect
leads to TB2-1 and TB2-2 in the
slave Processor. Meter should indi-
cate 7 to 14 vac. Tap PC board to
check that the voltage does not
fluctuate.
i. If voltage at TB2-1 and TB2-2 is not
between 7 and 14 volts or if the
indication fluctuates when the board
is tapped, replace the PC board.
(1)
To remove Processor PC board,
tag and disconnect wires from
TB1 and TB2. Remove and keep
seven screws. Remove PC
board.
(2)
To install new PC board, orient
the board so the terminal strips
are adjacent to the conduit en-
trance holes. Secure the PC
board to the chassis with seven
screws. Connect wires to TB1
and TB2.
h. Bad tamper alarm
a. Check all tamper alarm switches (TAS).
switch in one or
Tap each cover to ensure that no
more chassis.
switch contacts are floating and
causing alarms. Open the Processor
chassis cover. Pull the TAS plunger
5-14
