Control Board Power Supply Test - Lincoln Electric COMMANDER 400 SVM133-B Service Manual

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CONTROL BOARD POWER SUPPLY 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
electrical 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
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will determine whether the weld control power supply from the control board that
supplies power to the weld control circuit, display, 2-4 switch circuit, and CV SCR drive cir-
cuit is defective. A defective power supply can cause loss of weld output and loss of weld
control.
MATERIALS NEEDED
5/16" Nut Driver
Multi-Meter
Commander 400 Wiring Diagram (See the electrical diagrams section of this manual)
Control PC Board layout (See the electrical diagrams section of this manual)
This procedure takes approximately 40 minutes to perform.
TROUBLESHOOTING & REPAIR
WARNING
COMMANDER 400
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