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SQUARE WAVE TIG 275
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TROUBLESHOOTING & REPAIR
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
FUNCTION PROBLEMS
The ammeter display reads “000.”
The machine has output but no
control.
1. None 1. Check leads #221 and #222
between the output shunt and
plug J2 on the control board.
See the Wiring Diagram.
2. The control board may be faulty.
One of the display meters is blank. 1. None 1. Check the leads and connec-
tions between the display board
and the control board. See the
Wiring Diagram.
2. The display board may be
faulty.