ARMY TM 5-6675-309-14
MARINE CORPS TM 08840A-14/1
Section III. TROUBLESHOOTING
b. Test Connections. Connect cables only when
called for in the test procedures.
pected, perform test procedure in accordance with
NOTE
first column contains the test operation to be per-
Incorrect connections can cause wrong
formed. The second column contains the normal indica-
indications. See figure 8-4 for electrical
tion to be observed when the procedure has been
connections.
performed. The third column contains the corrective
action to be taken if the normal indication is not
c. Procedure. Perform testing in accordance with
obtained. The fourth column gives the coordinates on
the schematic diagram of the affected circuitry. When
performing corrective actions, refer to the PSTS sche-
matic diagram (figure FO-2) and wire list (table 8-1) to
determine where to make voltage measurements. For J2
Correct digital voltmeter scale must be
and J3 connector-pin locations, see figure 8-3A. See the
selected manually. The digital voltmeter
PSTS arts location diagram (figure 8-5) and exploded
does not change range automatically.
view (figure 8-6) for location of parts. Wherever a
NOTE
corrective action has been taken, the complete test
procedure must be repeated to verify repair. The self-
In the malfunction indication/corrective
test procedure must be followed in the order given.
action column of table 8-5, components
to be replaced are listed in order of most
likely failure. Verify component failure by
making voltage and resistance checks be-
fore replacement. After a component is
a. Test Equipment and Materials.
replaced, check for normal indication be-
f o r e attempting to replace another
component.
lent, for all voltage and impedance measure-
Indicators may light at various times
ments.
throughout this test. Unless listed in table
(2) Stopwatch.
lighted indicator.
If the corrective action does not eliminate
the malfunction, then check for parallel
273.
s h o r t i n g paths (e.g., shorted diodes,
shorted relay contacts, etc.)
