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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-9 F-9
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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
1-888-935-3877.
TIG MODE PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
The arc "flutters" when TIG welding.
The arc "pulsates" when AC TIG
welding.
1. The tungsten electrode may be
too large in diameter for the cur-
rent setting.
2. The tungsten tip may not be
"sharp" enough.
3. The gas shielding may be insuffi-
cient. Increase the gas flow and
or reduce the tungsten stickout
beyond the gas cup.
4. Check for contaminated gas or
leaks in the gas line, torch, or
connections.
5. If a helium blend is used as a
shielding gas then reduce the
percentage of helium.
1. Make sure the gas and proce-
dure are correct for the process
being used.
1. Check the polarity switch for
proper operation and loose or
faulty lead connections. See
wiring diagram.
2. Perform the SCR Bridge Test.
3. Check for loose or faulty connec-
tions at the shunt. ( leads #221
and #222 ).
4. Check components R3 and C4 in
the high voltage transformer pri-
mary circuit. Replace if neces-
sary. See wiring diagram.
5. The control board may be faulty.
Replace.
1. Check the micro switch S2A on
the polarity switch. It may be
stuck closed. See wiring dia-
gram.