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POWER MIG 255
TROUBLESHOOTING & REPAIR
F-10 F-10
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
The contact tip seizes in the gas
diffuser.
The welding arc is variable and
sluggish.
The arc striking is poor.
1. The tip being over heated due to
excessive current and/or high
duty cycle welding.
2. A light application of high tem-
perature anti-sieze lubricant
(such as Lincoln E2607
Graphite Grease) may be
applied to the contact tip
threads.
1. Check the welding cable con-
nections for loose or faulty con-
nections.
2. Make sure the wire feed speed,
voltage, and shielding gas are
correct for the process being
used.
1. Check the welding cable con-
nections for loose or faulty con-
nections.
2. Make sure the wire feed speed,
voltage, and shielding gas are
correct for the process being
used.
1. Make sure tip is tight in diffuser.
1. Perform the SCR Rectifier
Assembly Tests.
2. The control board may be faulty.
Replace.
1. The output capacitor bank may
be faulty. Check for loose con-
nections at the capacitors. Also
check for leaky capacitors.
Replace if necessary.
WARNING: The liquid elec-
trolyte in these capacitors is
toxic. Avoid contact with any
portion of your body.
2. The control board may be faulty.
Replace.
WELDING PROBLEMS (Continued)