Output Rectifier Bridge Removal And Replacement Procedure - Lincoln Electric Fleet 400 Service Manual

LINCOLN ELECTRIC

OUTPUT RECTIFIER BRIDGE 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 Output Rectifier Bridge.
MATERIALS NEEDED
7/16" Socket
7/16" Open-End Wrench
1/2" Socket
1/2" Open-End Wrench
1/2" Nutdriver
Penetrox Heat Sink Compound (Lincoln Part #T12837-1)
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Fleet 400 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" socket and a 7/16" open-end wrench, remove the bolt, nut, lock washer and two flat
washers securing each lead set (W1/W6, W2/W3 and W4/W5) to the AC terminals of the output
rectifier bridge. See Figure F.32. See Wiring Diagram. Label and disconnect leads.
6. Using a 1/2" socket and a 1/2" open-end wrench, remove the two bolts, nuts, lock washers and four
flat washers securing leads B2, B5 and POS-SHUNT to the positive terminal of the output rectifier
bridge and leads B1 and B4 from the negative terminal of the output rectifier bridge. See Figure
F.32. See Wiring Diagram. Label and disconnect leads.
7. Using a 1/2" nutdriver, remove the two nuts, lock washers and four flat washers securing the output
rectifier bridge to the fuel tank shelf. See Figure F.33.
8. The output rectifier bridge
REPLACEMENT PROCEDURE
1. Carefully position the new output rectifier bridge into the machine.
can now be removed and replaced.
Fleet™ 400 Service Manual
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