Module Assembly and Disassembly Procedures

TM 11-5820-509-35

1032/PRC-47) at the locations shown in figure 386.

(d) To remove card assembly E1

(3) Return the receiver-transmitter to its

(containing the cw oscillator and vox circuits), first

upright position.

perform step (c) to remove card assembly E2; then

loosen and remove the six remaining 2-56 x 1/4 net

(4) If the module being removed is Signal

head screws 13 per side) that secure this card assembly

Data Translator CV-1377A/PRC-47 (A3) or Oscillator

to the sides of the module chassis. Carefully fold this

Control C-4311/PRC-47 (A7), adjust the KILOCYCLES

card forward to expose the components mounted to the

indicator to 2000 before attempting to remove the

face of it. (R83 is connected to the back of this card,

module from the main chassis.

opposite R85).

(5) Carefully pull the module straight out of its

(e) The component parts attached

mating chassis connector using the handle on top of the

directly to the module chassis may be individually

module if available.

removed as required for repair or replacement.

c. Replacement.

(1) Align the module guide pins with the guide holes

NOTE

in the main chassis.

If interconnecting wires between the

card assemblies or between a card

CAUTION

and the module connector, or

Before attempting to install Signal

between individual components on

Data Translator CV-1377A/PRC-47 at

the chassis are removed to affect

location A8A3 or Oscillator Control

repairs, tag each wire carefully so

C-4311/PRC47 at location A8A7 on

that it may be reconnected to its

the

main

chassis,

set

the

proper terminal location.

KILOCYCLES indicator to 2000, then

adjust the module shaft coupling to

(2) Repair Procedures.

Replace any

the orientation shown in figure 3-44

defective component or repair the circuit using the

(CV-1377A/PRC-47) or figure 3-63 (C-

procedures outlined in section IV. Component parts

4311/PRC-47) to prevent damage to

shown on the module schematic diagram (fig. 7-9) are

the module or its drive shaft during

located on figures 3-16 through 3-19.

replacement.

CAUTION

(2) Press the module firmly into its chassis

connector.

When using a soldering iron to

remove or to replace a component

(3) Tighten the module retaining screws (fig.

part, use only enough heat to cause

3-86) to secure the module to the chassis.

the solder to flow. Excess heat can

(4) If no further modules are to be serviced

damage the component and may also

and maintenance procedures are complete, replace the

damage the printed circuit.

(3)

module stiffeners (fig. 3-85) and return the receiver-

Reassembly Procedures.

transmitter to its case using the procedures detailed in

paragraph 3-11b.

(a) Replace and solder any wires

removed from the module connector or between the

3-13.

Module

Assembly

and

Disassembly

card assemblies during disassembly and repair

Procedures

procedures.

(b) Install the circuit cards in their

a. Audio Frequency Amplifier AM-3506/PRC47

respective locations (fig. 3-6) beginning with card

(A8A1 ). (fig. 3-6, 3-16 through 3-19)

assembly E1, if it has been removed.

(1) Disassembly Procedures.

(a) Loosen and remove the two 4-40 x

CAUTION

5/16 pan head screws and their associated washers that

When installing card assemblies E 1

secure the cover to the module chassis; carefully

and E2 in the chassis dress the

remove the cover by lifting it from the module.

module cabling to prevent stressing

(b) To remove card assembly E3

the cards.

Card or component

(containing the driver and agc amplifier stages), loosen

damage can result if these card

and remove the four 2-56 x 1/4 flat head screws (two

assemblies are forced into place.

per side) that secure this card assembly to the sides of

the module chassis; carefully fold the card assembly

forward out of the chassis.

with the 2-56 x 1/4 flat head screws (eight per side).

(d) Replace the module cover and

(containing the microphone and audio amplifier stages),

secure it in place with two 4-40 x 5/16 pan head screws

loosen and remove the six 2-56 x 1/4 flat head screws

and associated flat washers inserted through the holes

(three per side) that secure this card assembly to the

in the top of the cover.

sides of the modules chassis carefully fold this card

forward (away from E1).

3-98