TROUBLESHOOT RADIO SET CONTROL C-7392( )/ARN-89( )
Troubleshoot radio set control C-7392( )/ARN-89( ).
Given a radio set control C-7392( )/ARN-89( ), radio receiver R-1496( )/ARN-
89( ), maintenance kit MK-994/AR, digital multimeter AN/USM-486, signal
generator SG-1170/U, a Number 2 pencil, and a qualified supervisory OJT
Acceptable performance is obtained when the soldier can troubleshoot the C-
7392( )/ARN-89( ) to a faulty subassembly in two of three C-7392( )/ARN-89(
)s within 1 hour per fault.
At the aviation intermediate maintenance (AVIM) level (direct
support), you will be expected to troubleshoot the C-7392( )/ARN-89( ) down
to a faulty subassembly. Just as you did earlier when troubleshooting the
receiver, you will replace the defective subassembly you find with a known
good one. You will then send the faulty subassembly to a higher level of
maintenance to be repaired.
You will not have to learn a new procedure, since troubleshooting the
control unit is quite similar to the procedure you learned when
troubleshooting the receiver in Lesson 1. Remember, you --
a. Performed a basic test.
fault isolation guide, then there is more than one fault.
Isolate each fault separately.
When a module replaced under a
subtest does not correct the fault, proceed with module-by-module
substitution until fault is corrected.
You will need the following equipment or its equivalent:
a. Radio set control C-7392( )/ARN-89( ).