REMOVAL AND INSTALLATION PROCEDURES - TM-5-6350-264-14-P-20044

TM 5-6350-264-14&P-2

NAVELEX EE181-AA-OMI-030/E121 RT1161 M9443

T.O. 31S9-2FSS9-1-2

wire is not caught under board. Insert screws

Remove enough conduit clamps to swing

through PC board, and tighten them to secure

Transceiver chassis away from the mounting

board. Connect black ground lead to pin near

surface. Remove screws that secure transducer

tamper alarm switch. Connect transducer leads

mounts to sides of the chassis. From the rear of

to pins at each end of PC board. Replace

the housing, remove screws that secure the

Transceiver housing cover.

transducer mount to the rear panel of the

chassis. Remove the transducer mount. Use a

g. After

replacing

major

components

7/8-inch (2.23 cm) rod, such as a wooden dowel,

assemblies, test the UMS for proper operation

to press against the screened end of the

under worst case conditions, with all noise or

transducer, and press it out of the mount.

turbulence-producing equipment in operation.

Remove the plastic washer. Disconnect leads

Ensure that key-operated switch on Control Unit

from rear of the transducer.

is in access position. Remove the Processor

chassis cover, and pull the TAS plunger all the

f. To replace a transducer, match dot color on

way out. Disconnect the wire from TB1-1. Set

transducer with dot color on mount; blue for

multimeter to ohms and connect leads to TB1-1

receive and white for transmit. Put top side of

and TB1-2. Meter should indicate less than

mount against a flat surface, and align

2,000 ohms. Walk into the secure area. The

transducer with underside of mount. Use heel

meter indication should change to over 100,000

of hand to press transducer into mount until

ohms. Remain motionless for several seconds

shoulder around bottom of transducer is flush

and the meter indication should return to its

against bottom on mount. Use a 7/8-inch (2.23

original level.

Connect wire to TB1-1.

cm) rod, such as a wooden dowel, to press

Disconnect wire from TB1-2, and connect meter

plastic washer down inside mount until it is flat

leads to TB1-5 and TB1-6.

Meter should

against screened end of transducer. To match

indicate less 2,000 ohms. Remove the four

leads to the transducers, note that the transmit

screws securing the Transceiver chassis cover.

transducer (white dot) requires 8-inch (20.32

Slowly raise the cover. While the cover flanges

cm) leads and that the receive transducer (blue

are still engaged, the meter indication should

dot) requires 3 1/2-inch (8.89 cm) leads. Ensure

change to over 100,000 ohms. Remove cover.

that transducer leads have approximately one

Pull TAS plunger all the way out. The meter

twist per inch (2.54 cm). Connect leads to rear

indication should return to its original level.

of transducer. Place transducer mount inside

Replace the Transceiver chassis cover, and

chassis and insert two screws through rear panel

secure it with screws. Use a straightedge

and into mount. Insert screws through sides of

across the Processor chassis to depress the

chassis and into transducer mount. Tighten the

TAS plunger. The meter should indicate less

screws to secure the mount in the chassis.

then 2,000 ohms. Slowly raise the straightedge.

Swing chassis against mounting surface, secure

When the TAS plunger moves 1/4-inch or less,

with mounting hardware, and replace conduit

the meter indication should change to over

clamps. Shift PC board off center toward

100,000 ohms. Disconnect the meter leads

receive transducer (blue dot). Align single

from TB1-5 and TB1-6 and connect the wire to

screw hole in board with screw hole in center of

TB1-2. Replace the Processor chassis cover

receive transducer mount. Ensure that black

and secure it.

ground

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