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TROUBLESHOOTING & REPAIR
F-14 F-14
SQUARE WAVE TIG 275
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
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
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
STICK WELDING PROBLEMS
The stick electrode “blasts-off”
when touched to the work piece.
1. The welding current may be too
high for the electrode size.
Reduce current control setting
or use a larger diameter elec-
trode.
1. Perform the
SCR Bridge Test.
2. The control board may be faulty.
Variable or sluggish welding arc
when welding in the Stick mode.
1. Check the work and electrode
cables for loose or poor connec-
tions.
2. The welding cables may be too
small or too long to permit the
desired current to flow.
3. The welding current may be set
too low.
1. Check the polarity switch for
excessive wear or faulty con-
nections.
2. Check the interior heavy current
carrying leads and connections.