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SQUARE WAVE TIG 255
F-14
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No gas or water flow when arc start
switch or amptrol is activated in the
TIG Mode. Machine has output -
fan runs. When toggling between
the Stick and TIG Modes a “Click”
can be heard indicating that the
solenoids are operating.
Arc rectification when AC TIG weld-
ing.
There is no gas or water flow when
the arc start switch or amptrol is
activated in the TIG mode. The
machine has output and the fan
runs. When toggling between the
Stick and TIG modes a “click”
CANNOT be heard indicating that
the solenoids are NOT operating.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Gas supply is empty or not
turned on.
2. Gas or water hose may be
pinched.
3. Gas or water solenoid may be
blocked with dirt. Use filters
to prevent reoccurrence.
Consult your Local welder/gas
distributor.
1. Tungsten electrode may be
too small for process.
2. Manual balance control may
be misadjusted. Readjust to
the negative direction.
3. If helium gas is being used,
reduce percentage of helium.
None
RECOMMENDED
COURSE OF ACTION
Possible gas or water supply
problem.
Contact The Lincoln Electric
Service Department (216) 383-
2531 or 1-800-833-9353(WELD).
1. Check components R3, R4,
and C2 in the high voltage
transformer primary circuit.
Replace if faulty.
2. Check the SCR bridge. See
Static and Active SCR Tests.
1. The gas or water solenoid may
be defective.
Check for 115vac at the sole-
noid leads. The machine must
be in the TIG mode and the arc
start switch activated.
2. If 115vac is not present at the
solenoids then check the
Protection/Snubber board. See
Protection/Snubber Board
Continuity Test.
3. If the above tests are OK -
Then the Control board may be
faulty. Replace.
TIG WELDING PROBLEMS
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 216-383-2531 or 1-800-833-9353.
CAUTION