Continuity Test (CRC)

TM 55-4920-430-13

4-65. Continuity Test (CRC). (See fig. 4-8.) Test of the control panel consists of continuity and

voltage measurements. The following test checks the circuit that provides a source of continuity test

current, an indicator light that indicates continuity, and two selector switches that connect the test cir-

cuit to all control panel pins for continuity testing. For this test, continuity is defined as a resistance of

0.5 to 1.5 ohms. Proceed as follows:

a. Perform the following continuity test by setting the continuity test TENS and UNITS switches

S13 and S14. Observe the continuity light while 0.5 ohms is connected between the test points; the light

shall be ON. Change to 1.5 ohms; the light shall be OFF.

b. For the self test open test (position 00-0), the light shall be off. For position 00-1, the light shall be

on (self short test).

NOTE

q Continuity selector positions 00-2 thru 10-5 are for AFCS panel

tests. Positions 20-0 thru 30-6 are for AFCS computer test.

q J4 is PANEL J1. J5 is PANEL J2.

DO NOT connect CCDA cable assembly W6 to the test set during this

test.

UNITS

J4-K

J4-P

Off

J4-R

TENS

J4-F

J4-G

J5-H

J5- P

J4-H

J4- L

J4-N

Self Test

J4-N

J5-K

J4-L

J5-L

J5-N

Open

Short

J5-R

J4-L

J4-P

J4-R

J5-P

J5-R

J5-L

J4-U

J4-V

J5-U

J5-V

J1-h

J1-z

J3-f

J1-J

J2-3

J3-C

J3-D

J3-N

J3-t

J1-R

J3-AA

J1-f

J3-AA

J1-t

J1-X

J1-M

J1-KK

J1-GG

J1-p

J1-k

J3-AA

J3-AA J3-AA

J3-AA

4-73