NAVELEX EE181-AA-OMI-030/E121 RT1161 M9443
Table 5-1. Troubleshooting Procedures - Continued
press plastic washer down inside
mount until it is flat against
screened end of transducer. To
match leads to the transducers,
note that the transmit trans-
ducer (white dot) requires 8-
inch (20.5-cm) leads and the
receive transducer (blue dot)
requires 3 1/2-inch (8.9-cm)
leads. Ensure that transducer
leads have approximately one
twist per inch (2.5 cm). Con-
nect leads to rear of transducer.
Place transducer mount inside
chassis and insert screws through
rear of the chassis and into
mount. Insert screws through
sides of chassis and into trans-
ducer mount. Tighten the four
screws to secure the mount in
the chassis. Swing chassis
against mounting surface,
secure with mounting hardware,
and replace conduit clamps.
Shift PC board off center toward
receive transducer (blue dot).
Align single screw hole in board
with screw hole in center of
receive transducer mount. En-
sure that black ground wire is
not caught under board. Insert
screws through PC board and
tighten them to secure board.
Connect wires to TB1. Connect
transducer leads and black
ground lead to PC board.
d. Poor or broken
a. Use the multimeter set on ohms to
check between Processor TB1-9,
TB2-9, chassis, and conduit. Check
between TB2-4 and TB2-8. If any
of these indications is not 0 ohms,
check the wire connections at the
terminal strips, conduit, and PC
board connections to the chassis.