TM 11-6625-2575-14
Section Il. TROUBLESHOOTING
fied, sectionalization should begin with the front
7-3. Troubleshooting Approach
panel controls, and proceed to localization by
a. In troubleshooting the AN/USM-203A, sys-
checking voltages and waveforms at particular
thematically isolate the defect by a process of
test points in the AN/USM-203A. The +30-
elimination from the symptom to a particular
volt and the - 30-volt regulated supplies should
circuit, and then to a particular component or
be checked because they are common to several
tioning and to the schematic diagram (fig. FO-
AN/USM-203A circuits.
3).
c. To aid the troubleshooter, a test point guide
b. After an instrument failure has been veri-