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Stopping Procedure
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TM-11-5830-255-14 Intercommunication Stations LS-626/FSC and LS-627/FSC Manual
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Remote Intercom Unit Circuit Analysis


TM 11-5830-255-14
4-1. Introduction
4-2. Intercom System Functional Block
Diagram Description
(fig. 4-1)
Figure 4-1. Control and remote intercom system
functional block diagram.
switch S21 is held at TALK, it connects the coil
of relay K1 to 48V dc causing relay K1 to
operate, switching the loudspeaker (LS1) ter-
minals to the input of microphone preamplifier
TLC-503 (AMPL-2) the audio output of which
is applied through a fixed 30 dB attenuator pad
4-3. Central Intercom Unit Circuit Analysis
comprised of resistors R3, R4, and R6 to the
(fig. F0-2)
input of talk power amplifier TLC-409 (AMPL-
3). The output of this amplifier is applied through
closed contacts 3 and 4 of relay K1, contacts
A and B of the channel in use (S1 through S20)
to the VF line connections for that channel on
jack J1 or J2, supplying audio to the associated
remote station. Amplifier AMPL-3 is used to
provide capability to drive all 20 remote lines
if used simultaneously, and is nominally adjust-
ed for a -6 dBm output across 10-ohm load
resistor R2.
e. Aural and Visual Alarm and Control Cir-
cuits. When RING pushbutton S22 in depressed,
alarm DS21 sounds at the central intercom unit


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