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TROUBLESHOOTING & REPAIR
SCR REMOVAL AND AND REPLACEMENT
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 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 trou- bleshooting assistance before you proceed. Call
DESCRIPTION
The following procedure will aid the technician in removing the SCRs from the output rectifi- er heat sink asssembly for maintenance or replacement.
MATERIALS NEEDED
5/16" nut driver 1/2" Wrench 7/16" Wrench Diagonal cutters
1/4" socket or box end wrench Putty knife
Fine steel wool (No. 000)
Heat sink compound, Lincoln Electric #E2529 (Penetrox
SQUARE WAVE TIG 355
