MAINTENANCE OF CONVERTER, IF (A20)

TM 32-5865-069-24&P

(6) Use the four screws retained in step b.(2) to secure the printed

wiring board to the assembly.

(7) Solder the printed wiring board to the assembly.

(8) Ensure the repaired assembly meets all the requirements of table 5-9.

5-10. MAINTENANCE OF CONVERTER, IF (A20). A20 is tested using AN/USM-410, refer

to para 5-2. The assembly is repaired by replacing faulty or damaged components

and cables. RF cable routing is described in table 5-10. Table 5-11 is a wire

list for the assembly. The following subparagraphs provide general instructions

for the replacement of components:

CAUTION

When disconnecting or reconnecting miniature coaxial cables, take

care not to twist or strain the cable.

NOTE

Before replacing a suspected defective component, ensure the asso-

ciated wiring is not defective.

Use the wire list, table 5-11, and

schematic diagram FO-18.

a. Replace top plate mounted components (S1, AR1) as follows:

(1) Disconnect coaxial cable connection(s) to the defective component.

(2) Label and unsolder all connecting wires at the terminals of the

defective component.

(3) Remove and retain the three screws and washers securing the top-plate

to the threaded posts.

(4) Carefully separate the plates to allow access to the mounting

hardware.

Converter, IF (A20), Cable Routing

Part

Reference

Number

designation

5053047-7

AT1-J1

S1-J5

6053048-11

AR1-OUT

FL1-A

5053048-6

FL1-B

U1-RF

5053047-8

Y1-J1

U1-LO

AR1-IN

5053239-7

AT1-J2