Chapter 3. DEPOT REPAIRS AND ALIGNMENT

TM 11-5820-549-50-1

CHAPTER 3

DEPOT REPAIRS AND AUNEMENT

Section I. DEPOT REPAIRS

the braid. Place fresh braid over the joint as it becomes

3-1. General Parts Replacement Techniques

saturated with solder. Use this procedure to remove as

much of the solder as possible. Use small scalpel blade

The AN/PRR-9(XE-9) is a transistorized unit,

to free the lead from the copper circuit and straighten it,

constructed compactly. Be extremely careful when

using small longnose pliers.

replacing parts and assemblies.

a. Whenever wires are removed, replace with the

3-2.

Removal of AN/PRR-9(XE-9) Jack Housing

same lead dress and length as the wires which were

Assembly (fig. 3-1)

removed. Always examine replaced wires to be sure

insulation is in good condition so that accidental

grounding of the conductor will not take place.

Remove the jack housing assembly for repair of the

headset jack A2A1J5 or battery connector A2A1P3 as

b. Use a pencil-type soldering iron with a 25watt

follows:

maximum capacity. This equipment is transistorized. If

a. Remove the electronic unit assembly A2 from

only ac-operated irons are available, use an isolating

the receiver case.

transformer. Do not use a soldering gun; damaging

voltages can be induced in components.

b. Remove the hexagonal nut A2A1H1 and

protective cover A2A1MP1 from the headset jack.

c. Check any soldering iron, before use, for shorts

to the tip. If a short is found, do not use the iron on this

c. Remove the two flathead screws A2A1H2 that

equipment.

attach the jack housing assembly to the front plate

assembly.

d. When soldering or unsoldering integrated circuit

leads, work quickly; excessive heat may cause

d. Remove hexagonal nut A2A1H2 from the

permanent damage to the integrated circuit or circuit

battery plug connector A2A1P3.

board.

e. Work the assembly loose to reach parts, as

e. To remove solder from printed circuit board

required.

pads and connectors, use a piece of untinned copper

f. When replacing the jack housing assembly, be

braid, approximately 1/8-inch in width. Put a small

sure insulation is not damaged where wires go through

amount of flux on copper braid. Place end of braid on

front plate assembly.

top of the joint. Place soldering iron tip on top of the

braid. Solder then should start to flow from the joint into

3-1