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TROUBLESHOOTING AND REPAIR
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components and for troubleshooting of specific circuits.
F-10F-10
POWER MIG 200
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the
Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353
CAUTION
WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
The weld bead is narrow or ropy.
May have porosity with the elec-
trode stubbing into the plate.
The contact tip seizes in the gas dif-
fuser.
1. Make sure the welding proce-
dures and electrode polarity are
correct for the process being
used.
2. Make certain the shielding gas is
correct and the flow is proper.
3. Make sure the weld joint is not
“contaminated”.
1. The tip is being over heated due
to excessive current and/or high
duty cycle.
2. A light application of high temper-
ature anti-seize lubricant may be
applied to the contact tip threads.
1. Perform the Output Bridge Rectifier
Test.
2. The output capacitors may be faulty.
Check for loose connections at the
capacitors. Also check for leaky
capacitors. Replace if necessary.
WARNING: The liquid electrolyte in
these capacitors is toxic. Avoid con-
tact with any portion of your body.
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