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TROUBLESHOOTING & REPAIR
F-9 F-9
POWER MIG 350MP
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Weld bead is narrow or ropy. May
have porosity with electrode stub-
bing into plate.
1. Make sure the weld procedure
and electrode polarity is correct
for the process being used.
Welding voltage may be too low
for wire feed speed being used.
2. Make sure shielding gas is cor-
rect and flow is proper.
3. Make sure the weld joint is not
“contaminated”.
1. Check the Output Voltage
Waveforms. If waveforms are
not correct Perform the Output
Rectifier Assembly Tests.
2. Reload latest software. Contact
a Lincoln Electric sales repre-
sentative for latest software.
3. The Control board may be faulty.
Replace.
The arc is unstable and or “hunt-
ing.”
1. Check for worn or melted contact
tip.
2. Check for loose or faulty connec-
tions on the work and electrode
cables.
3. Make sure electrode polarity or
welding process being used is
correct.
4. Check for rusty or dirty wire.
5. Make sure machine settings are
correct for process being used.
(shielding gas, wire type, wire
size).
1. Check for loose connections at
the output terminals, the chokes,
and all heavy current carrying
leads. See the Machine
Diagram.
2. Make sure that the transformer
secondary leads are securely
connected to the Output Rectifier
assembly.
3. Check the Output Voltage
Waveforms. If waveforms are
not correct Perform the Output
Rectifier Assembly Tests.
4. Reload latest software. Contact
a Lincoln Electric sales repre-
sentative for latest software.
5. The Control board may be faulty.
Replace.
CAUTION
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.