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TROUBLESHOOTING & REPAIR
F-41 F-41
COMMANDER 400
WARNING
STATIC SCR/DIODE RECTIFIER BRIDGE 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).
TEST DESCRIPTION
This test will help determine if an SCR or diode is shorted or “leaky.” See the Oscilloscope
Waveforms in this section for normal output waveforms.
MATERIALS NEEDED
Analog Volt/Ohmmeter (Multimeter)
5/16” Nut driver
3/8” Nut driver
Commander 400 Wiring Diagrams (See the Electrical Diagrams section of this manual.)
This procedure takes approximately 65 minutes to perform.