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TROUBLESHOOTING & REPAIR
F-29 F-29
SQUARE WAVE TIG 275
WARNING
ACTIVE SCR TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid elec-
trical shock, please observe all safety notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshoot-
ing assistance before you proceed. Call 216-383-2531 or 1-800-833-9353 (WELD).
DESCRIPTION
The Active SCR Test will determine if the device is able to be gated “ON” and conduct current
from anode to cathode.
MATERIALS NEEDED
An SCR tester as outlined in this procedure
TIG 275 Wiring Diagram
3/8” Nut driver
This procedure takes approximately 20 minutes to perform.