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TROUBLESHOOTING & REPAIR
F-77 F-77
COMMANDER 300
WARNING
DISPLAY BOARD CALIBRATION 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 1-800-833-9353 (WELD).
DESCRIPTION
This test will determine if the display board (if so equipped) is properly calibrated.
MATERIALS NEEDED
None
This procedure should take approximately 45 minutes to perform.