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6. Replace the input rectifier when any of the
tests are NOT OK.
NOTE: When installing a new input rectifier,
torque the mounting nuts (in a cross-tightening
pattern) to 6 inch-pounds (.7 Nm). Torque ter-
minals to 26 inch-pounds (3 Nm). PROCEED
TO STEP 7 TO CHECK RELATED COMPO-
NENTS.
7. Inspect main power switch S1 and replace
if faulty. Go to step 8.
8. Test capacitors C1 and C2 and replace both
capacitors if either is faulty.
NOTE: Faulty capacitors could be the reason
for input rectifier failure.
Visually inspect the capacitors for leakage,
damage, etc., and use appropriate test equip-
ment to determine component integrity.
9. Perform the Switch Board Test.
10. After all tests are completed, install the
case wraparound cover.
TROUBLESHOOTING & REPAIR
F-27 F-27
INVERTEC STT
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INPUT RECTIFIER TEST (continued)
TABLE F.3 – INPUT RECTIFIER TEST
TEST POINTS
+PROBE -PROBE ACCEPTABLE METER READING
9AGreater than 100K ohms
9BGreater than 100K ohms
9CGreater than 100K ohms
A9 Less than 100 ohms
B9 Less than 100 ohms
C9 Less than 100 ohms
12 A Less than 100 ohms
12 B Less than 100 ohms
12 C Less than 100 ohms
A12Greater than 100K ohms
B12Greater than 100K ohms
C12Greater than 100K ohms