c. Remove the batteries from the SB-22
nication Station LS-147(*)/FI
(*)/PT (TM 11-5805-262-12).
d. Disconnect the wires from the binding
a. Remove the power cord connector
posts on the rear of the SB-22(*)/PT.
plug from the INTERCOM power duct
e. Replace the SB-22(*)/PT by the fol-
receptacle (fig. 11).
lowing appropriate procedures in para-
by loosening the captive wingnuts.
c. Disconnect the signal cord from the
binding posts on the rear of the LS-147(*)/
FI.
d. Remove the LS-147(*)/FI from its
a. Remove the telephone leads from the
mounting position.
TA-312/PT binding posts.
e. Replace the LS-147(*)/FI by following
b. Remove the flathead screw on the side
the procedures in a through d above in the
of the mounting bracket.
reversed order.
c. Lift the TA-312/PT out of the mount-
ing bracket and remove the holding plate
from the buzzer recess on the side of the
TA-312/PT.
a. Remove the wingnuts that secure the
d. Remove the batteries from the TA-
SB-22(*)/PT retaining bar (fig. 20) and
312/PT (TM 11-2155).
e. Replace the TA-312/PT by following
raise the retaining bar.
b. Slide the SB-22(*)/PT forward and
the appropriate procedures in paragraph
remove it from the rack mounting.
Section II. ORGANIZATIONAL, FIELD, AND DEPOT MAINTENANCE
Isolate defective components, parts, or
indicates the maintenance functions and tools au-
wiring of the S-183/MSC-31 by making
thorized for each maintenance echelon.
appropriate voltage, resistance, or con-
tinuity tests with Multimeter AN/URM-
105. Refer to figure 37 when isolating
trouble in the power circuits and to figure
a. Procedures for localizing troubles
within the AN/MSC-31 are given in the
components, parts, or wiring. Use the
equipment performance checklist (para
chart below for references to repair pro-
32) .
cedures.
b. Procedures for troubleshooting com-
I
ponents, parts, and wiring of the S-183/
MSC-31 are given in paragraph 41.
c. Procedures for troubleshooting the
major components of the AN/MSC-31 are
given in the applicable technical manuals
-
f o r removal and replacement of major
components.
Warning: Be extremely careful when
performing the troubleshooting proce-
dures; dangerous voltages are present in
the equipment.
