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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Machine input contactor does not
operate.
(White Power light off)
(White Power light on)
Machine input contactor operates,
but no output when trying to weld.
Machine does not have maximum
output.
Machine has output only momentarily
after contactor closes.Output returns
momentarily every 75 seconds.
Machine has output only momen-
tarily, contactor opens immediately
after closing. (Green Safe Output
light off)
Machine output doesn't stay on.
(Amber Thermal light on, fan run-
ning, digital Output display reads
greater than 100).
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.
TROUBLESHOOTING
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Supply line fuse is blown.
2. Contactor power circuit has an
open lead.
3. Broken power lead.
4. T2 internal thermal breaker open
5. Defective POWER ON/OFF
Switch (S1).
7. Control circuit diode bridge open
8. Transformer iron rear thermostat open.
1. Open input contactor coil.
2. Defective Control Board.
3. Contactor moving iron binding.
1. Electrode or work lead loose or
broken.
2. Open main transformer (T1) pri-
mary or secondary circuit.
3. Firing P.C. board not connected
or is faulty.
4. Firing board not getting enable
signal.
1. One input fuse blown.
2. One phase of main transformer
(T1) open.
3. Faulty Control or Firing P.C.
boards.
4. Faulty SCR bridge.
5. Input voltage too low.
1. Machine has either an internal or
external short circuit on the output.
2. Faulty Control PC board.
1. Output voltage peaks are too
high because input voltage too
high.
2. Output voltage peaks are too
high because output filter circuit
not working.
3. Output voltage peaks are too
high because control circuit isn't
sensing output voltage.
4. Control board faulty.
5. Output SCR shorted.
1. Machine is overloaded.
CAUTION
MULTI-SOURCE
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
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