CHAPTER 4. DEPOT MAINTENANCE

TM 11-5820-695-35

CHAPTER 4

DEPOT MAINTENANCE

Section I. REPAIRS

4-1. General

4-2. General Parts Replacement Techniques

a. General instructions on parts replacement for

direct support maintenance must also be observed during

depot maintenance activity. Refer to paragraph 3-19 for

a. Depot maintenance repair procedures, which

general parts replacement techniques.

supplement repair data in chapter 3, are provided in this

b. If conformal coating on printed wiring boards is

section. Depot repair consists primarily of removal and

removed during maintenance, recoat the printed wiring

replacement procedures for defective subassemblies or

boards following the instructions provided in paragraph 4-

piece parts. Most subassemblies and piece parts are

13.

readily accessible and are easily replaced.

Repair

instructions, therefore, are supplied only for those

assemblies requiring special techniques or a sequence of

4-3. Equipment Required

steps which are not readily obvious.

Tools and materials required to perform the depot repairs

given in this section are listed below:

b. Special instructions for particular assemblies of

a. Tool pit, Radio Repair TK-100/G, FSN 6180-0-79.

Transmitter, Radio T-1054(P)/GRC-144() and T-

b. Tool Kit, Electronic Equipment TK-105/G, FSN

1054(P)A/GRC-144 are covered in paragraphs 4-4

5180-610-8177.

through 4-9; particular assemblies of Receiver, Radio R-

c. Crimping tool MS 3191-4 with head assembly

1467(P)/GRC-144()

and

R-1467(P)A/GRC144

are

W25, FSN 5120-230-771.

covered in paragraphs 4-10 and 4-11.

Special

d. Extraction tool MS 18278, Size 20, FSN 5120-

instructions for particular assemblies of Converter-

230-3770.

Multiplier

CV-3633/GRC-144(V)

are

covered

e. Extraction tool CET-C6B, FSN 5120-963-7661.

paragraphs 4-11.1 through 4-11.4.

4-4. Repair of Transmitter Frequency Mixer Stage 1A9

(fig. 6-71)

Transmitter frequency mixer stage 1A9 contains coaxial

c. Throughout equipment repair, reference should

circulator 1A9HYI, replaceable at direct support level

be made to wiring diagram and parts location illustrations.

(para 3-26) and is nonrepairable, and crystal mixer

I1lustrations supplied in this chapter supplement those

1A9A1, replaceable at organizational maintenance level

located in chapters 3 and 5, and those contained in TM

(TM 11-5820-695-12).

115820-695-12. Wiring diagrams and parts location

For depot repair of crystal mixer 1A9A1, specific

diagrams for Transmitter, Radio T-1054(P)/GRC-I44() and

instructions are provided for the replacement of crystal

T-1054(P)A/GRC-144 are provided in figures 4-6 through

diode 1AOA1CR1. Instructions for the removal and

4-35 and 5-59 through 5-89; illustrations for Receiver,

replacement of crystal diode 1A9A1CR1 are provided in a

Radio R-1467(P)/GRC-144V) and R-1467(P)A/GRC-144

and b below.

are provided in figures 4-36 through 4-46 and 5-90

CAUTION

through 5-97. The wiring diagram for Indicator, Antenna

Before

handling

crystal

diode

Alignment ID-1708 GRC is provided in figure 4-47. Parts

1A9A1CRI,

ground

yourself

location diagrams for Converter-Multiplier CV3633/GRC-

equipment case ground in order to

144(V) are provided in figures 5-108 through 5-118.

dissipate any static charge.

a, Removal of Crystal Diode 1A9A1CR1 (fig. 5-71).

Change 6

4-1