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F-53 F-53
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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SCR BRIDGE / HEAT SINK ASSEMBLY REPLACEMENT PROCEDURE
WARNING
Service and repair should be performed only by Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment could result in danger to the technician or the
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
tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting
assistance before you proceed. Call (800) 833-9353 (WELD).
DESCRIPTION
The following procedure will aid the technician in removing the SCR bridge and/or an individual
heat sink assembly for repair or replacement.
MATERIALS NEEDED
3/8” Nut Driver
9/16” Nut Driver
1/2” Nut Driver
Solder
Solder Gun/Iron
T12837 (Dow Corning 340) Heatsink Compound
This procedure takes approximately 2 Hours to perform.