Replacement of Transfer Prism Assembly No. 1

TM 9-1240-369-34

d. Replacement of Transfer Prism Assembly No. 1

(7) Install

new

transmitter

component

(see fig. 3-6).

assembly by performing steps (2) thru f6) in reverse

order.

(1) Remove optical bench assembly as

(8) Remove two screws (48).

described in paragraph 3-12 b.

(9) Purge transmitter component assembly

(2) Loosen three expander screws (25), turn

housing at valve stem (49) in accordance with TM 9-

three adjustment screws (26) clockwise, and remove

2350-230-12. Set final pressure to 0.5 psig.

transfer prism assembly No. 1 (27).

(10) Install optical bench assembly as

(3) Install new transfer prism assembly No. 1

instructed in paragraph 3-12 b. Do not install receiver-

by performing steps (1) and (2) in reverse order.

transmitter cover.

(4) Install optical bench assembly as

h. Replacement of Flashtube V1 on Transmitter

instructed in paragraph 3-12 b.

Component Assembly A76A3 (see fig. 3-6).

e. Replacement of Malfunction 3/Buffer Logic

Circuit Card Assembly A76A1 (see fig. 3-6).

(1) Remove optical bench assembly as

described in paragraph 3-12 b.

(1) Remove optical bench assembly as

(2) Remove 10 screws (38), 10 washers (39),

described in paragraph 3-2 b).

and transmitter cover assembly (40).

(2) Remove

four

screws

(28),

four

(3) Remove screw (52) elliptical reflector

lockwashers (29), four washers (30).

retainer (53), and transmitter reflector assembly (54).

(3) Remove malfunction 3/buffer logic circuit

(4) Loosen setscrew (42) and pull high

card assembly AT6A1 (31) disconnecting connector

voltage cable lead from flashtube high voltage holder

W1J1 in the same motion.

(43). Use ball wrench (9, table 2-1) to loosen setscrews.

(4) Install new malfunction 3/buffer logic

(5) Loosen two screws (55) which secure

circuit card assembly by performing steps (1) thru (3) in

flashtube heat sink holder (56) and slide towards the rear

reverse order.

for tube removal clearance.

(5) Install optical bench assembly as

(6) Loosen screw (57) which clamps the

instructed in paragraph 3-12 b.

cathode electrode and remove flashtube V1 (58).

f. Replacement of A-Trigger Circuit Card Assembly

A76A2 (see fig. 3-6).

CAUTION

(1) Remove optical bench assembly as

described in paragraph 3-12 b.

Ensure that new flashtube and cavity

(2) Loosen two captive screws on screw

are free of foreign material and

locking assembly (32) and disconnect connector A2P1

fingerprints.

(33) from harness connector W1J2.

(7) Clean new flashtube and cavity as

(3) Remove two screws (34), two lockwashers

instructed in paragraph 2-12 b: step (3).

(35). two washers (36),.and A-Trigger circuit card

(8) Install flashtube V1 (58) in flashtube heat

assembly A76A2 (37).

sink holder (56) so that the anode electrode (marked with

(4) Install new A-trigger circuit card assembly

red paint or "+" symbol) is at the forward end (or end with

by performing steps (1) thru (3) in reverse order.

high voltage cable lead) of the cavity. Do not tighten

(5) Install optical bench assembly as

clamping screw (57).

instructed in paragraph 3-12 b.

(9) Position flashtube in flashtube high voltage

g. Replacement

Transmitter

Component

holder (43). Position flashtube heat sink holder (56) so

Assembly A76A3 (see fig. 3-6).

that the internal flashtube cathode and anode are

(1) Remove optical bench assembly as

centered on the ruby rod clamp.

described in paragraph 3-12 b.

(10) Rotate flashtube and adjust position of

(2) Remove 10 screws (38), 10 washers (39),

heat sink so that anode (as viewed through glass

and transmitter cover assembly (40).

envelope of flashtube) is centered in high voltage holder

(3) Disconnect connector P1 (41).

(43).

(4) Loosen setscrew (42) and pull out high

(11) Tighten screw (57) and two screws (55)

voltage cable lead from flashtube high voltage holder

securing flashtube heat sink holder (56).

(43). Use ball wrench (9, table 2-1) to loosen setscrews.

(5) Remove

four

screws

(44),

four

CAUTION

lockwashers 145), tour washers (46), and transmitter

High voltage cable lead must slip

component assembly A76A3 (47).

freely over flashtube anode without

(6) Clean transmitter telescope as instructed

bending flashtube.

in paragraph 2-12 b. step (3).

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