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If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
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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.