Field Bridge Rectifier Removal And Replacement Procedure - Lincoln Electric Cross Country 300 Service Manual

LINCOLN ELECTRIC
FIELD BRIDGE RECTIFIER 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 Field Bridge Rectifier.
MATERIALS NEEDED
3/8" Nutdriver
Dow Corning 340 Heat Sink Compound (Lincoln Part #T12837)
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Cross Country 300 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Capacitor Discharge Procedure.
4. Label and disconnect leads 200A, 200, 5H, 201A and 6A from the field bridge rectifier. See Figure
F.53. See Wiring Diagram.
5. Using a 3/8" nutdriver, remove the nut, lock washer, flat washer and insulating washer securing the
field bridge rectifier to the mounting post. See Figure F.54.
6. The field bridge rectifier can now be removed and replaced.
REPLACEMENT PROCEDURE
1. Clean the mating surfaces of the control panel and the field bridge rectifier.
2. Apply a coating of Dow Corning 340 heat sink compound to the mating surface of the field bridge
rectifier.
3. Carefully position the field bridge rectifier onto the mounting post.
4. Using a 3/8" nutdriver, attach the nut, lock washer, flat washer and insulating washer securing the
field bridge rectifier to the mounting post.
5. Connect leads 200A, 200, 5H, 201A and 6A to the field bridge rectifier. See Wiring Diagram.
6. Perform the Case Cover Replacement Procedure.
7. Perform the Retest After Repair Procedure.
Cross Country™ 300 Service Manual
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