Receive Transducer Removal Procedure

(5) Perform the procedure in steps b(5)

(7) Connect the receiver transducer (blue

dot) red and blue leads to their respective terminals

through (9) above.

adjacent to the receiver transducer.

Frequency Control Transducer Removal

(8) Connect the black lead from the chassis

Procedure (fig. 1-1).

ground to its respective terminal (BLK) on the pc board.

(1) Remove and retain the two 6-32 x 3/8

(9) Connect the identified interconnecting

inch long screws fastening the cover to the enclosure.

leads to their respective terminals on TBI.

(2)

Remove the frequency control

c. Receive Transducer Removal Procedure. The

transducer from plastic retainer.

receive transducer is identified by a blue dot, 3 inch

(3) Remove the plug from the frequency

long attaching lead and it is located at the opposite end

control transducer.

of the enclosure from the conduit entrance(s) (fig. 1-1).

Frequency Control Transducer Installation

(1) Perform the procedure in steps a(1)

Procedure (fig. 1-1 ).

through (3) above.

(1) Insert the plug into the transducer and

(2) Remove the two 4 x inch long flat

press it into the plastic retainer.

head sheet metal screws thread through the sides of the

(2) Secure the cover to the enclosure using

enclosure and into the plastic receive transducer support

two 6-32 x 3/8 inch long screws.

(fig. C-3).

(3)

Remove the enclosure mounting

7-10. Printed Circuit Board Removal and

hardware and the necessary conduit clamps that will

Installation Procedure

permit removing the transceiver enclosure a sufficient

distance away from the mounting surface to allow

a. Processor PC Board Removal Procedure (fig.

removal of the final two 4 x inch long flat head sheet

C-1).

metal screws through the rear of the enclosure into the

(1) Remove and retain the two 6-32 x 3/8

transducer plastic support.

inch long screws fastening the cover to the enclosure.

(4) Remove the two flat head sheet metal

(2) Tag, identify and remove the leads from

screws from the rear of the enclosure and the plastic

terminal boards TB1 and TB2.

support with the receive transducer attached.

(3) Remove and retain the seven 6-32 x 3/8

(5)

Using a short length of 7/8 inch

inch long screws fastening the pc board to the

diameter wooden dowel against the screened end of the

enclosure. Remove the pc board.

receive transducer press the transducer and deflector

b. Processor PC Board Installation Procedure (fig.

(phenolic ring) out of the plastic support.

C-1).

(6) Unplug the 3 inch long lead from the

(1) Orient the pc board so that the terminal

rear of the receive transducer.

boards (TB1 and TB2) are adjacent to the conduit

d. Receive Transducer Installation Procedure.

enclosure. Secure the pc board to the enclosure using

The spare receive transducer is identified by a blue dot

seven 6-32 x 3/8 inch long screws.

on the outer edge of the screened end of the transducer.

(2)

Connect the appropriate leads

(1) Mate the screened end of the receive

(identified by tags) to terminals on terminal boards TB1

transducer with the rear of the round sleeve portion of

and TB2.

the plastic transducer support. Place the jack end of the

c. Transceiver PC Board Removal Procedure (fig.

transducer against a firm surface and press the top end

C-3).

of the plastic sleeve portion with the hand palm until the

(1) Remove and retain the four 4 x inch

transducer ridge seats firmly against the plastic support.

long sheet metal screws fastening the cover to the

Press the deflector (phenolic ring) into the plastic

enclosure.

support and against the transducer screen.

(2) Tag, identify and remove the leads

(2) Plug the 3 inch long lead into the

attaching to terminal board TB 1.

receive transducer jack.

(3) Disconnect the transmit transducer and

(3) Secure the receive transducer and

the receive transducer red and blue leads along with the

plastic transducer support to the enclosure using four 4

black chassis ground lead from the pc board.

x inch long flat head sheet metal screws, two through

(4) Remove the three sheet metal screws

the rear of the enclosure and one through each side of

securing the pc board to the two plastic transducer

the enclosure (fig. C-3).

supports. Remove the pc board.

(4) Secure the enclosure to the mounting

surface and the conduit clamps that were temporarily

loosened.

7-6