Chapter 3. FUNCTIONING OF EQUIPMENT - TM-32-5865-218-24-P0029

TM 32-5865-218-24&P

FUNCTIONING OF EQUIPMENT

Section I.

GENERAL

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-

nance.

3-2. Organization.

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.

Section II.

FUNCTIONAL DESCRIPTION

3-3. ECM PANEL INDICATOR. Refer to figure FO-1. The ECM panel

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

E1.

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.