jack in the signal duct (fig. 11 and
12) .
8e(6)) can be connected between the handset-head-
set and the SB-22(*)/PT to allow the operator
Note. Install two Batteries BA-3O in the battery
greater freedom of movement within the shelter.
compartment and operate the LB-CB-CBS switch to
LB.
PT
a. Preliminary Procedure.
Note. When TA-312/PT's are used at the road-
side tabletop locations (fig. 12), they are not in-
(1) Ground the shelter (para 16) and
stalled in mounting brackets but are connected as
make power connections (para 17)
in b below.
before using the lights and con-
venience receptacles. For test
a. Installation in Mounting Bracket.
-
purposes, any satisfactory ground
(1) Loosen the wingnut on the side of
may be used in place of the ground
the mounting bracket (fig. 21).
rods indicated.
(2) Rotate the clamping arm to obtain
(2) Energize the ac circuits (para 23).
access to the flathead screw on
the side of the mounting. Tighten
Note. Refer to paregraph 22 for infor-
the wingnut.
mation covering the S-183/MSC-31 con-
trols and instruments.
(3) Use a screwdriver to remove the
flathead screw that secures the
(3) Connect the CX-4760/U (para 19)
holding plate (inside the mounting
to the 26-pair cable receptacle in
bracket).
the power and signal entrance box
(4) Remove the TA-312/PT from its
(fig. 8).
carrying case; store the case.
b. Test Procedure.
(1) Remove the TA-312/PT's from the
(5) Insert the holding plate into the
storage cabinet and connect them
buzzer recess in the side of the
(para 12b) at PHONE 1, 2, and 3
TA-312/PT.
positions (fig. 12).
(6) Place the TA-312/PT in the mount-
(2) Make 26-pair cable stub lead con-
ing bracket and replace the flat-
nections to test four SB-22(*)/PT
head screw.
line circuits at a time and operate
b. Connection.
the TA-312/PT's (TM 11-2155)
(1) Connect the prepared leads of the
and the SB-22(*)/PT (TM 11-5805-
telephone cord to the LINE binding
262-12) to perform the ringing and
posts on the TA-312/PT.
talking tests indicated in the chart
(2) Connect the telephone plug into the
below.
appropriate PHONE (1 through 4)
