Lincoln Electric IDEALARC AC-1200 - Manual (Page 15)

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 SCR’s 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.
Low supply line voltage.
Faulty contactor.
Determine cause if possible and
replace shorted device.
Replace rheostat.
Replace or reconnect.
Replace or reconnect.
Determine cause if possible and
replace P.C. board.
Check with Power Company.
Repair or replace.