Chopper Module Board Resistance Test Procedure - Lincoln Electric Fleet 400 Service Manual

LINCOLN ELECTRIC

CHOPPER MODULE BOARD RESISTANCE TEST 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 test will help determine if the Chopper Module Board is shorted. This test can only detect some
problems in the "Power" section of the Module. Problems with some other board components may not be
detected.
MATERIALS NEEDED
7/16" Nutdriver
Volt/Ohmmeter With Diode Test Capability
Wiring Diagram
TEST 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. Locate the chopper module board. See Figure F.16. See Wiring Diagram.
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 of the chopper module board. See Figure F.17. See Wiring
Diagram.
6. Label and disconnect all of the leads from the chopper module board and position them so they do
not make electrical contact with any part of the chopper module boards. See Figure F.17. See
Wiring Diagram.
7. Using a volt/ohmmeter, perform the tests outlined in Table F.5 on the chopper module board. See
Figure F.17. See Wiring Diagram.
8. When testing is complete, connect all previously disconnected leads to the chopper module board.
See Wiring Diagram.
9. If any of the tests fail, the chopper module board may be faulty.
10. If faulty, perform the Chopper Module Board Removal And Replacement Procedure.
11. Perform the Case Cover Replacement Procedure.
Fleet™ 400 Service Manual
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