FUNCTIONING OF EQUIPMENT
3-1. Scope. This chapter provides a functional description of the
ECM panel indicator and the countermeasures control. The circuits
are described to the extent necessary for general support mainte-
In addition to the functional description con-
tained herein, refer to TM 32-5865-012-10 for operating instructions
for the ECM panel indicator. The following description references
simplified schematic diagrams and schematic diagrams. The simplified
schematic diagrams are provided in text. The schematic diagrams are
provided as foldout drawings. Foldout drawings referenced in the
text as FOs are located at the rear of the manual.
indicator contains lamps DS1 thru DS5, switches S1 and S2, and
potentiometer R1. Safety features are provided in the form of
interlock jumpers on the rear panel connector.
Indicator Circuits. MASTER CAUTION lamp DS1 lights when
external system equipment provides an input at connector pin J1-K.
The lamp dimmer power at connector pin J1-J passes to terminal stud
The power is distributed to lamps DS2 thru DS5 and switch S2.
External equipment provides ground at connector pins J1-L, J1-G,
J1-H, and J1-M to light lamps DS2 thru DS5, respectively.
b. CREW CALL Switch S1. The +28 V dc ICS power and return
inputs at connector pins J1-Y and J1-Z pass to CREW CALL switch S1
contacts 2 and 4, the common (C) contact of A, and the normally open
(NO) contact of B. The crew call flasher input at connector pin J1-P
passes to the lamp and B common contacts. Switch S1 is a momentary-
action, pushbutton switch indicator. When switch S1 is pressed and
held, the C and NO contacts of B close to light the CREW CALL lamp.
The C and NO contacts of A close to connect the ICS power return to
If switch S1 is restored
external equipment at connector pin J1-R.
when external equipment provides an input at connector pin J1-P, the
CREW CALL lamp flashes.
c. RCDR ON Switch S2. The 115 V ac, 400 Hz input at connector
pin J1-A passes to the B common contact of RCDR ON switch S2.