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CONTROL RECTIFIER 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 correct AC voltages are being applied to the Rectifier Diode
Bridge and supplied from the Rectifier Diode Bridge to the Digital Power Supply board.
MATERIALS NEEDED
Volt/Ohmmeter
3/8" Nut driver
POWER MIG 300 Machine Schematic
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TROUBLESHOOTING & REPAIR
F-19
F-19
POWER MIG 300
WARNING