TM 32-5865-010-24&P
FUNCTIONING OF EQUIPMENT
Section I.
GENERAL
Scope.
This chapter contains theory of operation on the DF control-
Due to simplicity of the unit, discussion will be limited
indicator.
to an overall functional description, followed by a description of two
different types of switch/indicators used.
Section II.
FUNCTIONAL DESCRIPTION
Overall Functional Description.
The DF control-indicator consists of eight switch/indicator
assemblies, two connectors, and associated wiring. The switch/
indicator assemblies are all momentary action, pushbutton, normally
closed type switches. As shown in Figure FO-1, pressing switch/
indicators S1 thru S7 creates an open between switch contacts 9 and
10. Releasing the switch establishes contact between these pins.
Pin 10 of switches S1 thru S4 are all connected to pin 53 of con-
nector J1, which provides an external ground input when interconnected
in a system configuration. Pressing switch S1 creates an open between
J1-53 and J1-51. Pressing switch S2 creates an open between J1-53 and
Pressing switch S3 creates an open between J1-53 and J1-46,
J1-50.
and pressing switch S4 creates an open between J1-53 and J1-47.
Pin 10 of switches S5, S6 and S7 are all connected to pin 54 of
connector J11 which also provides an external ground input when
interconnected in a system configuration. Pressing switch S5 creates
an open between J1-54 and J1-52; pressing switch S6 creates an open
between J1-54 and J1-48; and pressing switch S7 creates an open
between J1-54 and J1-49.
Switch/indicator S8 differs from switch/indicators S1 thru S7, in
that it has two sets of switch contacts. The first set of contacts,
pins 9 and 10, is normally closed when the switch is released, and
provides continuity between J2-B and J2-C. The second set of
contacts, pins 9 and 11, is closed when the switch is pressed, and
provides continuity between J2-B and J2-D. As shown in figure FO-1, a
third set of contacts, pins 5 and 6, is also present on the switch,
but is not used in this application.
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