Control Board Removal And Replacement Procedure - Lincoln Electric Classic 300 MP Service Manual

LINCOLN ELECTRIC

CONTROL 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 Control Board.
MATERIALS NEEDED
9/16" Open-End Wrench
9/16" Nutdriver
3/8" Nutdriver
5/16" Nutdriver
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Classic 300 MP machine.
2. Perform the Case Cover Removal Procedure.
3. Using a 9/16" open-end wrench and a 9/16" nutdriver, remove the nut, bolt, lock washer and three
flat washers securing each side of the CV box to the fuel tank rail (two sets). See Figure F.37.
4. Using a 3/8" nutdriver, remove the two screws securing the finger guard panel to the machine. See
Figure F.37.
5. Label and disconnect plugs J12, J6, J7, J1 and J2 from the control
Diagram.
6. Using a 5/16" nutdriver, remove the four screws securing the control board to the mounting
bracket. See Figure
7. The control board can now be removed and replaced.
REPLACEMENT PROCEDURE
1. Carefully position new control board into the machine.
2. Using a 5/16" nutdriver, attach the four screws securing the control board to the mounting bracket.
3. Connect plugs J12, J6, J7, J1 and J2 to the control
4. Using a 3/8" nutdriver, attach the two screws securing the finger guard panel to the machine.
5. Using a 9/16" open-end wrench and a 9/16" nutdriver, attach the nut, bolt, lock washer and three
flat washers securing each side of the CV box to the fuel tank rail (two sets).
6. Perform the Case Cover Replacement
7. Perform the Retest After Repair Procedure.
F.3X.
Procedure.
Classic® 300 MP Service Manual
board. See
board. See Wiring Diagram.
Figure F.38. See Wiring
72