Section V. ASSEMBLY AND DISASSEMBLY

TM 11-5820-509-35

printed circuit, a suitable conventional wire may be

(b) Prepare a bonding material by

soldered to the circuit to bridge the area of a crack.

mixing equal quantities of epoxy sealing compound

Standoff terminals or eyelets may be added to facilitate

(FSN 8030-589-8477, 1/2 pt.) and hardener (FSN

connection of component leads provided the circuit is

8030543-2587, 1/2 pt.). Mix only enough to do the

not altered.

immediate Job since it cannot be retained for later use.

(3) If an area of the printed circuit has lifted

from the board without cracking, and for a length of not

bonding agent so that it extends about 1/16-inch beyond

more than one inch, the printed circuit can be fastened

the raised circuit in all directions.

back to the board as follows:

(d) Permit the bonding agent to air dry

(a) Clean the raised area of the circuit

for at least 24 hours before using the card or doing

with technical acetone, FSN 6810-184-4795 (one

further work on the circuit.

gallon).

Section V. ASSEMBLY AND DISASSEMBLY

3-10. General

(3) Carefully lower the case over the

electronic equipment chassis until the six screw holes in

The tools required for removal of modules are included

the bottom of it are properly aligned to permit insertion

in Tool Kit, Radar and Radio Repair, TK87/U. Module

of the screws. Install the six screws and tighten

retaining screws are shown in figure 3-86. Before

securely.

removing Signal Data Translator CV-1377A/PRC-47

(4) Invert the unit to its normal operating

(A3) or Oscillator Control C-4311/PRC-47 (A7), set the

position and install Panel Cover CW-647/PRC-47;

KILOCYCLES indicator on the front panel of RT-671

tighten the six attaching screws.

/PRC-47 to 2000. This is necessary to align the drive

shaft couplings of these modules in a vertical position so

3-12. Removal and Replacement of Plug-in Modules

that the modules can be easily removed from the

chassis without coupling damage.

WARNING

High voltages are present in the

WARNING

circuits associated with Signal Data

Before removing any equipment

Translator CV-1377A/PRC-47, Power

cover or module from Radio

Supply PP-3618/PRC-47, and the

Receiver-Transmitter RT-671 /PRC-

power amplifier compartment. These

47, disconnect all power from the

voltages are dangerous and can

unit.

cause personal injury or death.

Ground

the

two

high-voltage

3-11.

Removal and Replacement of Receiver-

terminals on the main chassis (J1-A1

Transmitter Case

and J1-A2) to discharge the

capacitors

the

high-voltage

a. Removal.

circuits

before

beginning

(1) Loosen the six screws that secure Panel

maintenance within the chassis or

Cover CW-647/PRC-47 to the RT-671/PRC-47; remove

inside any module.

the cover.

(2) Invert the RT-671/PRC-47 so that it rests

a. General. Before loosening the module retaining

face down on the handles attached to the front panel.

screws (fig. 3-86), remove the upper module stiffeners

(3) Loosen and remove the six screws on the

(fig. 3-85). To remove the module from the main

bottom of the case that secure the case to Electrical

chassis, loosen the captive hardware and carefully lift

Equipment Chassis CH-474/PRC-47.

the module from the chassis connector. The following

detailed procedures apply to all plug-in modules of

(4) Carefully lift the case from the receiver-

Radio Receiver-Transmitter RT-671/PRC-47.

transmitter.

b. Removal.

b. Replacement.

(1) Invert RT-671/PRC-47 to expose the main

(1) Invert the Radio Receiver-Transmitter RT-

chassis components and wiring.

671/PRC-47 so that it rests on the handles attached to

the front panel.

(2) Loosen the four captive screws Five for

Signal Data Translator CV-1377A/PRC-47, and two

(2) Clean the interior of the case to remove

each for Amplifier-Modulator AM-3507/PRC-47 and

any accumulated dust or dirt.

Radio Frequency Oscillator O-

3-97