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 pre-
cautions detailed throughout this manual.

If for any reason you do not understand the test procedures or are unable to per-
form the test / repairs safely, contact the Lincoln Electric Service Department for
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

TEST DESCRIPTION

This procedure will determine if the overvoltage protection and related portions of the
Protection Board and Power Board are functioning properly.

MATERIALS NEEDED

Volt/Ohm Meter (multi-meter)

Misc. Hand Tools

Wiring Diagram (Section G)

NOTE: Fig. F.19 shows the Overvoltage Protection DC trigger Circuit.