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Chapter 3. FUNCTIONING OF EQUIPMENT - TM-32-5865-218-24-P0029
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TM-32-5865-218-24-P Countermeasures Panel Indicator ID-2300/ALQ-151(V) and Countermeasures Control C-11124/ALQ-151(V) Manual
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Table 3-1. Countermeasures Control Audio and Control Through-Wiring
TM 32-5865-218-24&P
Contacts 2 and 4 receive lamp voltage from terminal stud El.  Switch
S2 is an alternate-action, pushbutton switch/indicator.  When switch
S2 is pressed, the C and NO contacts of A close to connect ground
from connector pin J1-N to the lamp C contact.  The RCDR ON lamp
lights and the C and NO contacts of A close to connect the 115 V ac
to external system equipment at connector pin J1-D.  When switch S2
is restored, the C and NO contacts are open and the lamp is off.
d.  CSL BRT Potentiometer R1A.  External system equipment
applies lamp voltage to connector pin J1-V.  CSL BRT potentiometer
R1A varies the output to external equipment at connector pin J1-X.
EQPT BRT Potentiometer R1B.  External system equipment
e.
applies lamp voltage and ground to connector pins J1-S and J1-U.
EQPT BRT potentiometer R1B varies the output to external equipment at
connector pin J1-T.
Interlock Jumpers.  The interlock circuit originates at the
f.
external ac line.  The 115 V ac ground and 115 V ac neutral
potentials are routed through the ECM panel indicator and external
equipments in the system.  The ECM panel indicator interlock circuit
consists of jumpers between connector pins J1-C and J1-F, J1-B and
J1-E.  The ground interlock jumper also connects to the cable shield.
If connector J1 is removed, the interlock circuit is opened, and the
external units cannot operate.
3-4.  Countermeasures Control.  Refer to figure FO-2.  The
countermeasures control contains indicator circuit card assembly
(CCA) A3, voltage regulator A1, RF coaxial switch S1, and circuit
breaker CB1.  In addition, throuqh-wiring connections are provided
between external system equipments.  These connections (see table
3-1) pass audio and control signals that perform no function within
the countermeasures control.
a.  Indicator CCA A3.  Refer to figure FO-3.  The indicator CCA
conditions system audio signals and monitors plain text and radio
control signals.  It also provides control outputs to external system
equipment.  In addition, the indicator CCA contains a control circuit
that adjusts the brightness of front panel lamps on external system
equipment.
(1) Audio Signal Conditioning Circuits. As shown in figure
3-1, the XMTR AUDIO No. 2 (RCDR) input at connector pin J2-A passes
to the primary winding of transformer T1.  The primary winding also
receives the audio return inputs at connector pins J6-P and J6-X
through terminal board connections TB1-17 and TB1-19.  The secondary
winding of transformer T1 passes the audio signal through connector
pins J6-G and J6-H to external system equipment.

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