Power Check

TM 11-5820-509-12

(2) Disconnect power and audio cables from the

2-9. Power Check

receiver-transmitter front panel.

a. Battery Power. When battery power is used,

(3)

Disconnect the antenna (whip or wire),

proceed as follows:

disassemble (or roll) it carefully, and store it in its own

(1) On receiver-transmitter, set POWER/LIGHTS

antenna case (fig. 2-41.

switch (fig. 3-1) to ON/LO.

(4) Replace Cover, Panel CW-647/PRC-47 on the

(2) Press BATTERY TEST pushbutton and check

front of the receiver-transmitter and secure the six

that XMTR OUTPUT meter indicates in white area. If

fasteners. Retain the four large screws.

meter indicator does not deflect, check that 20A DC

(5) Remove Legs, Electrical Equipment MT-

POWER fuse is not defective. If the fuse is defective,

2786/PRC-47 from the receiver-transmitter and carefully

replace it.

wind the wires on their spools. Place the legs in the

(3) If fuse is not defective, check cable CX-

canvas case.

8395/PRC-47. If cable is defective, replace it.

(6) Assemble the shoulder strap billets, quick-release

(4) If meter indicator deflects, but not in white area,

fasteners, and the back strap (fig. 2-3) to the frame.

check the battery (open-circuited) with the multimeter.

(7) Attach the support plate assembly to the shoulder

with. The multimeter should indicate at least + 29.2 volts

strap assembly with two screws, washers, and nuts.

dc. If not, substitute another battery and repeat these

(8) Assemble the shoulder strap assembly to the top

procedures. For the defective battery, refer to TM 11-

of the frame by pushing down on the top curve and

6140-208-15.

snapping it in place.

(5) Set POWER/LIGHTS switch to OFF/ OFF.

(9) Secure the support plate assembly to the case of

b. Dc Generator Power. When a dc generator or

the receiver-transmitter, using two large screws used for

vehicular power is used, proceed as follows:

stowing the panel cover to the case. Chain the large

(1) Repeat a(l) and (2) above.

screws to the support place assembly, using two small

(2) If fuse is not defective, check cable CX-

screws, washers, and nuts.

8394/PRC-47. If cable is defective, replace it.

(10) Secure the bottom of the frame to the receiver-

(3) If meter indicator deflects but not in white area,

transmitter, using the two other large screws through the

check the power source with the multimeter for 26 volts

nylon clamps.

dc + 3.

(11) Mount the assembled pack on the man's back;

(4) Set POWER/LIGHTS switch to OFF/ OFF.

adjust the shoulder straps for comfort.

c. Ac Power. When ac power is used, proceed as

Packing Battery, Storage BB-451/U and

follows:

Accessories.

(1) Repeat a(1) and (2) above, except check 5A AC

(1) Repeat a(6) above.

fuse.

(2) Connect the hook on the battery retainer under

(2) If fuse is not defective, check cable CX-

the crossmember of the frame and secure the retainer to

8393/PRC-47.. If cable is defective, replace it.

the frame, using two screws and two nylon clamps (fig. 2-

(3) If meter indicator deflects, but not in white area,

4).

check the power source with the multimeter for 115 volts

(3) Install the battery on the battery retainer and

ac +10.

secure it in place with the strap provided.

(4) Set POWER/LIGHTS switch to OFF/ OFF.

(4) Place the rucksack and shoulder strap assembly

2-10. Preparation of Radio Set for

on top of the frame and snap it in place. Run the two

Man/Pack Transportation

straps at the base of the shoulder strap assembly under the

The radio is attached to rucksack frames for man/pack

battery retainer through the two buckles on the battery

transport. The receiver-transmitter is carried on one

retainer, pull tight, and secure.

frame, and the battery and accessory items are carried on

(5) Secure the canvas case containing the electrical

the other frame.

legs to the right side of the rucksack.

a. Packing Receiver-Transmitter, Radio RT-671 /PRC

(6) Secure the antenna case to the left side of the

-47.

rucksack.

(1) Be sure the POWER/LIGHTS switch (fig. 3-1) is

(7) Mount the assembled pack on the man's back;

at OFF/OFF.

adjust the shoulder straps for comfort

NOTE

If the radio set has just been unpacked, proceed

directly to (6) below.

2-6