Transformer Assembly Removal And Replacement Procedure - Lincoln Electric Tomahawk 1500 Service Manual

LINCOLN ELECTRIC

TRANSFORMER ASSEMBLY 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 Transformer Assembly.
MATERIALS NEEDED
Torx Nutdriver (Size T-20)
3/8" Nutdriver
Wiring Diagram
REMOVAL PROCEDURE
1. Remove the input power from the Tomahawk 1500.
2. Perform the Case Cover Removal And Capacitor Discharge Procedure.
3. Using a Torx nutdriver (size T-20), remove the two screws, lock washers and flat washers securing
the leads to terminals TR3 and TR1 of the inverter board. Label and disconnect the leads from
terminals TR3 and TR1 of the inverter board. See
4. Using a Torx nutdriver (size T-20), remove the two screws, lock washers and flat washers securing
the leads to terminals B5 and B6 of the output board. Label and disconnect the leads from
terminals B5 and B6 of the output board. See
5. Using a 3/8" nutdriver, remove the four screws securing the transformer assembly to the machine.
See Figure F.57.
6. The transformer assembly can now be removed and replaced.
REPLACEMENT PROCEDURE
1. Carefully position the new choke assembly into the
2. Using a 3/8" nutdriver, attach the four screws securing the transformer assembly to the machine.
3. Using a Torx nutdriver (size T-20), connect the two screws, lock washers and flat washers securing
the previously disconnected leads to terminals B5 and B6 of the output board. See Wiring Diagram.
Torque to 17 – 21 in/lbs.
4. Using a Torx nutdriver (size T-20), connect the two screws, lock washers and flat washers securing
the previously disconnected leads to terminals TR3 and TR1 of the inverter board. See Wiring
Diagram. Torque to 11 – 13 in/lbs.
5. Perform the Case Cover Replacement Procedure.
6. Perform the Retest After Repair Procedure.
Tomahawk® 1500 Service Manual
Figures F.53 and F.54. See Wiring Diagram.
Figures F.55 and F.56. See Wiring Diagram.
machine.
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