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TM 55-4920-430-13
DIGITAL
VOLTAGE/
MULTIMETER/
STEP
CONTROL/SWITCH
NORMAL RESULTS
POSITION
TEST PROCEDURES
NO.
NOMENCLATURE
(9) Same
(9) Apply a step voltage (9) Shall reach -2.37
(9) Same
of +15Vdc between
Vdc in 0.4 to 0.6
second.
J3-JJ (+) and J3-HH.
Measure voltage
between J3-w (+)
and J3-AA (-).
(10) GND (10) Disconnect all
(10) None
(10) DASH switch
external con-
S51
nections
(4) Disconnect dc power supply, and digital multimeter from receptacle pins.
4-62. Control Panel Simulation Test (CRC). (See fig. 4-8.) The following test checks the switches
that simulate the input and output signals that the control panel provides to the AFCS computer.
Proceed as follows:
a. Set digital multimeter FUNCTION switch to DC.
b. Set the digital multimeter RANGE switch to the voltage range necessary to make the voltage
measurement, Measure voltage between receptacle pins as follows.
STEP NO.
POSITION
RECEPTACLE PINS
VOLTAGE/INDICATOR
SWITCH
11.4 to 12.6 DS12 will
l-ENGAGE
J3-h(+) to J3-AA
(1)
HEADING switch
VDC
come ON.
S11
OPEN
DS12 will
O-DISENG
J3-h(+) to J3-AA
go OUT.
11.4 to 12.6 DS13 will
l-ENGAGE
J3-i (+) to J3-AA
BARO switch
(2)
come ON.
VDC
S64
0-DISENG
OPEN
DS13 will
tJ3-i (+) to J3-AA
go OUT.
l-ENGAGE
11.4 to 12.6 DS14 will
J3-j (+) to J3-AA
(3)
RADAR switch
come ON.
S12
VDC
0-DISENG
OPEN
J3-j (4) to J3-AA
DS14 will
go OUT.
l-SELECT
24 to 28.5
AFCS switch
J3-k (+) to J1-C
DS11 will
(4)
VDC
come ON.
S10
0-OFF
OPEN
DS1l will
J3-k (+) to J1-C
go OUT.

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