Control Panel Simulation Test (CRC)

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.

4-58