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LINCOLN ELECTRIC
Removal And Replacement Procedures
RECTIFIER BOARD REMOVAL AND REPLACEMENT PROCEDURE
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 1-888-935-3877.
TEST DESCRIPTION
This procedure will aid the technician in the removal and replacement of the Rectifier Board.
MATERIALS NEEDED
Phillips Screwdriver
RTV Compound
Dow Corning 340 Heat Sink Compound (Lincoln Part #T12837)
Wiring Diagram
REMOVAL PROCEDURE
1. Remove the input power from the Tomahawk 1500 machine.
2. Perform the Case Cover Removal And Capacitor Discharge Procedure.
3. Label and disconnect plug J66 from the rectifier
4.
Carefully remove the RTV compound from the terminals.
5.
Using a Phillips screwdriver, remove the five screws, lock washer, flat washer securing the leads to
terminals DCIN+, DCIN-, AC1, AC2 and AC3 of the rectifier board. See
6.
The rectifier board can now be removed and replaced.
7.
Using a Torx nutdriver (size T-20), remove the two screws, lock washers and flat washers securing
the input rectifier module to the heat sink. See
8.
The input rectifier module can now be removed and replaced.
REPLACEMENT PROCEDURE
1. Clean the heat sink surface.
2. Apply a coating of Dow Corning 340 heat sink compound to the mating surface of the input rectifier
module and the heat sink.
3. Carefully position the new input rectifier module into the machine.
4. Using a Torx nutdriver (size T-20), attach the two screws, lock washers and flat washers securing the
input rectifier module to the heat sink. Torque to 18-25 in/lbs.
Tomahawk® 1500 Service Manual
Figure
F.29. See Wiring Diagram.
board. See
Figure
F.30.
Figure
F.29.
51
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Troubleshooting
