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)
c. Poor or broken system
a. Use the multimeter set on ohms to
ground connections.
check between Processor TB1-9,
TB2-9, chassis, and conduit. Check
between TB2-4 and TB2-8. If any
of these indications are not 0 ohms,
check the wire connections at the
terminal strips, conduit, and PC-
board connections to the chassis.
b. Use the multimeter set on ohms to
check between Transceiver TB1-9,
chassis, and conduit. Check between
TB1-4 and receive transducer (blue
dot), blue lead. If any of these
indications are not 0 ohms, check
the wire connection at the terminal
strip, conduit connection, and PC-
board connections to the chassis.
Ensure that all transducer leads are
making good mechanical connections.
d. Bad transmit or
a. Set multimeter to ac volts. Connect
receive transducer.
leads to Transceiver TB1-1 and TB1-2.
The meter should indicate 7 to 14
vac. Remove the leads from the
transmit transducer (white dot). The
meter indication should increase a
few volts when the leads are discon-
nected.
b. Obtain two pieces of wire 18 to 28
AWG and about 12 inches (30.6 cm)
long. Disconnect all four transducer
leads from PC board. Use the two
pieces of wire to extend the receive
transducer (blue dot) leads so they
can be connected to the transmit
transducer terminals on the TAS end
of the PC board. The meter should
indicate 7 to 14 VAC at TBl-1 and
2 in the Transceiver. Disconnect one
of the added pieces of wire from the
PC board. The meter indication
should increase a few volts.
c. If the meter indication does not in-
crease when one of the transducers
is disconnected, replace that trans-
ducer.
5-9
