Figure 7-3. Installation of chassis nuts.

TM 11-5820-554-12

b. Install the two large chassis nuts in the holes of

-erly aligned on the extension plug with the

the Collins KWM-2/2A chassis side walls (fig. 7-2 and

shallow keyway in power connector P2.

7-3).

Before connecting to the a.c. line and

c. With the Collins KWM-2/2A and PP-

operating the combination, be sure the LINE

3990/FRC93 positioned (fig. 7-4), make the necessary

VOLT SELECTOR SWITCH of the PP-

phone jack connections. Use the end of the cable with

3990/FRC-93 is set to the proper position for

the right-angle connectors at the Collins KWM-2/ 2A

the a.c. power source which wild be used. If

connections. Run the shielded cables down through the

the switch is set for 110-volt operation and

cord channels in the mating face of the PP-3990/FRC-

the power supply is operated from a 220-volt

93 and underneath the power supply. Power cables for

source, damaging high voltages may be

Control, Radio Set C7515/FRC-93 (Collins 312B-5)

developed before the fuse blows.

may be run through the large holes in the front and

e. To remove the PP-3990/FRC-93 from its case

back sides of the PP-3990/FRC-93.

for access to the LINE VOLT SELECTOR SWITCH,

d. Push the PP-3990/FRC-93 and the Collins

remove the two Phillips-head screws from the rear (fuse

KWM-2/2A together, and tighten the thumbscrews in

side). Pull the PP-3990/FRC-93 from its case and

the chassis nuts to hold the two together. Be sure

check the LINE VOLT SELECTOR SWITCH to make

power plug P2 mates correctly with the corresponding

sure it is set for the line voltage which will be used.

jack in the Collins KWM-2/2A. (Fig. 7-5). shows the

Replace the power supply in its case, and reassemble to

complete assembly.

the Collins KWM-2/2A.

f. Plug the line cord connector into the a.c. outlet.

CAUTION

When using an extension cable such as the

The round pin of the a.c. connector is the ground

Collins 440F-1, Collins KWM-2/2A may be

connection. If the a.c. outlet is not fitted with a

damaged unless the key is prop

CHASSIS NUT

3/8 X32

HEX NUT

LOCK WASH

3/8 X32

HEX NUT

3/8" FLAT

LOCK WASHER

WASHER

CHASSIS NUT

FLAT

WASHER

CHASSIS

SIDEWALL

CHASSIS

SIDEWALL

ELOD0014

Figure 7-3. Installation of chassis nuts.

7-3