b. General test procedures.
You must determine the type of test and
identify the test points for these tests. Troubleshooting techniques for a
return power circuit defect are circuit substitution, followed by voltage
c. Test procedure 23.
The first test point (TP1) is at J24 on the MT-
1029 (Figure 50).
Remove the RT from the MT-1029.
Using extreme CAUTION, insert an insulated jumper wire between
pins B and C J24.
If the AM-1780 power lamp lights, the RT unit is bad.
IDS for repair.
d. Test procedure 24. If the AM-1780 power lamp does not light, the
next check (TP2) is at the end of the CX-4723 P501 pins A and C.
Remove the CX-4723 from the AM-1780
between pins A and C on CX-4723 P501.
If the meter indicates 22-30 volts DC, the AM-1780 is bad.
to IDS for repair.
e. Test procedure 25. If the meter indicates no voltage at TP2, remove
the jumper from J24 then test continuity between pin C of J24 and pin C of
J22 on the MT-1029 (TP3).
The MT-1029 must be disassembled to reach pin C of jack J22.
If the resistance measurement between pin C of J24 and pin C of
J22 indicates infinite ohms, the MT-1029 is bad. Repair it, if
possible, if not send to IDS for repair.
If the meter indicates zero ohms, the MT-1029 is good.
f. Test procedure 26.
Measure continuity from pin C to pin C, through
the CX-4723 (TP4).
Remove the CX-4723 from J7 of the J-3513, and test continuity
from pin C to pin C through the CX-4723.
If the meter indicates infinite ohms, the CX-4723 is bad repair
If the meter indicated zero ohms, the CX-4723 cable is good and
the J-3513 is bad.
Turn J-3513 in to the COMSEC support
maintenance for repair.