Lincoln Electric IM10119 IDEALARC AC-1200 - Manual (Page 17)

E-3 TROUBLESHOOTING E-3
IDEALARC ® AC-1200
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Welder welds at max. only no con-
trol.
Contacts chatter.
Diodes or SCRʼs on heat sink
assemblies shorted.
Shorted or grounded current controll
rheostat.
Output By-Pass Capacitors open or
disconnected.
Free wheeling diode open or discon-
nected.
P.C. board components failed.
1. Low supply line voltage. Check
with Power Company.
Faulty contactor.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.