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Items Comprising Power Supply PP-3990/FRC-93
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TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
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Operation - TM-11-5820-554-120047


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.
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


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