Chopper Module Boards Removal And Replacement Procedure - Lincoln Electric Fleet 650 Service Manual

LINCOLN ELECTRIC

CHOPPER MODULE BOARDS 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 Chopper Module Boards.
MATERIALS NEEDED
7/16" Nutdriver
Penetrox Heat Sink Compound (Lincoln Part #T12837-1)
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Fleet 650 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Chopper Module Capacitor Discharge Procedure.
4. Perform the Front Panel Removal Procedure.
5. Using a 7/16" nutdriver, remove the six screws, lock washers and flat washers securing leads to
terminals B1, B2, B3, B4, B5 and B6 on each of the chopper module boards. See Figure F.38. See
Wiring Diagram.
6. Label and disconnect leads 23A, 25A, 23 and 25 from quick-connect terminals B7 and B8 on each
chopper module board. See Figure F.38. See Wiring Diagram.
7. Label and disconnect the two leads attached to each thermostat. See Wiring Diagram.
8. Using a 7/16" nutdriver, remove the two screws and lock washers securing each of the chopper
module boards to the choppers and chokes bracket. See Figure F.39.
9. The chopper module board(s)
REPLACEMENT PROCEDURE
1. Carefully position the new chopper module board(s) onto the choppers and chokes bracket.
2. Using a 7/16" nutdriver, attach the two screws and lock washers securing each of the chopper
module boards to the choppers and chokes bracket.
3. Connect the two previously disconnected leads to each thermostat. See Wiring Diagram.
4. Connect leads 23A, 25A, 23 and 25 to quick-connect terminals B7 and B8 on each chopper module
board. See Wiring Diagram.
can now be removed and replaced.
Fleet™ 650 Service Manual
72