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 manu-
al.

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 216-383-2531 or 1-800-833-9353 (WELD).

DESCRIPTION

The following procedure will aid the technician in mounting stud type diodes to the aluminum
heat sinks on the DC-400.

MATERIALS NEEDED

5/16” Nut driver
1/2” Open end wrench
Lincoln E1868 (Dow Corning 340) Heat Sink Compuond
“Slip” type torque wrench
No. 000 fine steel wool

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