Lincoln Electric IM10067 CENTURY AC120 - Manual (Page 16)

C-2 TROUBLESHOOTING C-2
CENTURY® AC 120
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Power source stops.
Power switch on but no weld cur-
rent.
Unstable arc.
Porous weld.
Thermal Overload Protection acti-
vated due to overload.
Bad connection between ground-
clamp and workpiece.
Impurities on base metal.
Dirty base metal.
The Thermal Protection automati-
cally resets when the transformer
has cooled (approximately 15 min-
utes)
Clean or wire brush the
work surface.
Clean with wire brush.
Clean with wire brush.