Chopper Module Function Test - Lincoln Electric RED-D-ARC DX450 Service Manual

F-57
Service and repair should only be performed by 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 trou-
bleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will help determine if the chopper module is functioning properly, and receiving
the correct input from the output rectifier and control PC board.
This test can only provide meaningful results if the machine is producing normal AC aux-
iliary output.
MATERIALS NEEDED
Miscellaneous hand tools
Digital Multi-meter
Frequency counter or digital multi-meter with frequency counter function.
Wiring Diagram
TROUBLESHOOTING AND REPAIR

CHOPPER MODULE FUNCTION TEST

WARNING
DX450
F-57