Section III. REPAIRS

TM 11-5820-695-35

Section III. REPAIRS

When removing a defective part, be careful

NOTE

not to damage leads or other parts by pulling or pushing

them out of the way.

For all removal and replacement of

units listed in the procedures not

Whenever replacing a part, install the new

described below refer to TM-11-5820-

part in the same position as the original. Use an exact

695-12.

duplicate whenever possible.

3-19. General Parts Replacement Techniques

After a part has been replaced, perform the

testing procedures provided in section V of this chapter

Most parts in AN/GRC-144 Radio Sets are readily

to check that the equipment is operating properly.

accessible and can be replaced without special

procedures. The procedures required to remove or

Use a pencil-type soldering iron with a 25

replace piece parts and nonrepairable assemblies which

watt maximum heating capacity. If the iron must be

are not obvious or require the removal of one or more

used with ac, use an isolating transformer between the

parts are given in paragraphs 3-20 through 3-27

iron and the ac line. Do not use a soldering gun;

(Transmitter, Radio T-1054(P)/GRC-144(V) Repairs), 3-

damaging voltages can be induced in the equipment

38 through 3-52 (Receiver, Radio R-1467 (P)A/GRC-

parts.

144 Repairs), 3-53 (Indicator, Antenna Alignment ID-

1708/GRC Repairs) and 5-53.1 (Converter-Multiplier

If wiring must be replaced, use leads of the

CV3633/GRC-144(V) Repairs).

The following

same length and gauge if possible. With the exception

precautions apply when removing, replacing, or

of harness cabling, run the leads in the same manner as

repairing parts in AN/GRC-144(V) Radio Set.

the original wiring. For harness cabling, cut the old

conductor as short as possible without removing it from

NOTE

the harness. Dress the new conductor along the

harness and spot tie it to the outside of the harness.

For Radio Set AN/GRC-144 (V)4, refer

Make connections to same terminals used in the original

to paragraph 3-53.1 and set the

wiring, even where there are alternatives which appear

Converter-Multiplier CV-3633 /GRC-

electrically equivalent.

144(V), status panel 3A8 POWER

ON/OFF switch 3A851 to OFF.

Make well-soldered connections, using no

more solder than is necessary. A carelessly soldered

Before removal or replacement of any part,

connection may create a new fault and is one of the

unless otherwise stated, remove power from the unit

most difficult, faults to find.

using the procedures in paragraph 3-20a or 3-38a.

Similarly, restore power to the unit (para 3-20b or 3-38b)

Do not allow drops of solder to fall into the

after the part has been replaced.

unit. Do not allow a soldering iron to come into contact

with insulation or parts that might be injured by

Exercise care when removing or replacing

excessive heat.

rigid coaxial cables. Detailed procedures are provided

in TM-11-5820695-12 for removal and replacement of

Do not disturb the setting of any

rigid coaxial cables.

uncalibrated control without redetermining its proper

setting before returning the equipment to service. If any

Tag all hardware and components during

switches are operated, return them to their original

removal procedures for correct identification during

positions.

replacement procedures. Before a part is unsoldered,

note the position of the leads. If the part has several

leads, tag each of the-leads, before unsoldering any of

them.

Change 6 3-30.8