Lincoln Electric SVM133-B service manual Control Board Power Supply Test

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F-67 F-67

TROUBLESHOOTING & REPAIR

CONTROL BOARD POWER SUPPLY TEST

WARNING

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.

COMMANDER 400