After you have visually inspected the C-6533, you will want to perform an operational
test to see if the ICS unit is working properly.
You will need the following test equipment to perform the operational test.
Test facilities kit MK-994/AR.
Headset microphone H-101A/U (two required).
Tool kit TK-100/G.
150-ohm 1/2-watt resistor.
Make sure you have an operational C-6533 in the MK-994/AR. Equivalent
test equipment may be substituted.
IMPROPER CONNECTION OF TEST EQUIPMENT CAN CAUSE
DAMAGE TO EQUIPMENT OR BODILY INJURY.