Replacement of Coaxial Circulator 1A9HY1

TM 11-5820-695-35

CAUTION

ease the cover off of the box to provide access to the

Removal of components with rigid

upper terminal of the filters. Unsolder and remove the

coaxial cables must be performed

lead from the defective filter to be replaced.

carefully to prevent damage to the

(15)

Remove the hex-nut that secures the

rigid coaxial cables.

defective filter to the cover and remove the filter.

b. Replacement.

(1) Remove the mounting nut from the

(2) Remove transmitter frequency mixer

replacement filter and secure the replacement filter to

stage lA9 from plate assembly 1A16 (TM 115820-

the filter assembly cover with the mounting nut.

69.512).

(2) Solder the wire lead removed In step |

(3) Loosen, but do not remove, the screws

(a(14) to the upper terminal of replacement filter.

securing crystal mixer 1A9AI to the transmitter

(3) Place the cover on the assembly box

frequency mixer stage 1A9 enclosure.

being careful that the leads from the filters to connector

(4) Disconnect the mating type TNC

1A15A6J18 do not get crimped between the cover and

connector between coaxial circulator 1lA9tY1I and

the box. Secure the cover to the box using the four

crystal mixer IA9AI.

screws removed in step o(14).

(5) Slide crystal mixer IA9A1l away from

(4) Position the filter assembly so that the

coaxial circulator 1A9HYl until it is free of the mating

leads removed from the bottom terminals of the | filters

TNC connector, then remove crystal mixer 1A9A1 from

in step a(12) can be resoldered in place. Solder the

the transmitter frequency mixer stage 1A9 enclosure.

leads to their respective terminals.

(6) Remove the four screws and washers

(5) Solder the lead removed in step a(11) to

securing coaxial circulator lA9HYI to the transmitter

ground terminal E2 on the right side of the filter

frequency mixer stage 1AS enclosure

assembly.

(7) Using a 5,'16-inch open end wrench,

(6) Position the filter assembly to align its

loosen the nut securing coaxial cable 1A9W2 to the

mounting holes with the mounting holes in the top of the

INPUT J1 connector on coaxial circulator IA9HY1.

cabinet. Secure the filter assembly to the cabinet using

(8) Carefully slide coaxial circulator 1A9HY1

the four filter assembly mount ing screws and washers

toward the) bottom of the transmitter frequency mider

removed in step a(10) above.

stage IA9 enclosure until the connector pin in coaxial

(7) terminal board lA15TB4 into position and

cable 1A9W2 is free.

solder the four wires removed in step a (9).

(9) Lift coax:

al circulator IA9HY1 for

(8) Replace the filter clamp and secure in

clearance and disconnect coaxial cable 1A9W3 from the

place using the four screws removed In step n(8).

OUTPUT J3 connector on coaxial circulator lA9HY1.

(9) Reposition

cables

with

attached

(10) Remove coaxial circulator IA9HY1 from

connectors, lowered in step a[(5) and (7) above, so that

the transmitter frequency mixer stage 1A9 enclosure.

the connectors are in position for securing to the top of

electrical equipment cabinet 1A15.

Secure the

b. Replacement

connectors with the hex-nuts and washers removed in

step a(4) and (6).

(1) Insert replacement coaxial circulator

(10) Replace power supply 1A1(para 3-22g (6)

1A9HY1 into the transmitter frequency mixer stage 1A9

through (10)).

enclosure and connect coaxial cable 1A9W8 to the

(11) Connect cables disconnected in a(8)

OUTPUT J3 connector on coaxial circulator IA9HY1.

above.

(2) Carefully mate the connector pin on

(12) Restore power to T-1054/GRC-144

coaxial cable 1A9U'2 to the INPUT JI connector on

(para 3-20b).

coaxial circulator 1A9HY1 and then tighten the

connector nut on coaxial cable 1A9W2.

3-26. Replacement of Coaxial Circulator 1A9HY1

(3) Install the four screws and washers

(fig 3-1 and 5-71)

securing coaxial circulator I A9HY1 to the transmitter

frequency mixer stage 1A9 enclosure, but do not tighten

a. Removal.

the four screws at this time.

(1) Set POWER ON/OFF switch on meter

(4) Install crystal mixer IA9A1 into the

panel assembly 1A15A8 to OFF.

transmitter frequency mixer stage 1A9 enclosure

Change 1

3-48