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TROUBLESHOOTING & REPAIR
F-81 F-81
COMMANDER 400
WARNING
CONTROL PC BOARD REMOVAL, REPLACEMENT,
AND CALIBRATION
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 procedure will aid the technician in the removal and replacement of the control printed
circuit board. Stick and wire models also require a calibration procedure whenever a control
board is replaced. This procedure is provided here following the reassembly steps.
MATERIALS NEEDED
5/16" Nut driver
Phillips head screw driver
Volt/ohmmeter (for stick and wire model calibration only)
This procedure takes approximately 40 minutes to perform.