Lincoln Electric RANGER 305 D Service Manual page 118

RANGER 305D
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.
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 auxiliary output.
M TERI LS NEEDED
Miscellaneous hand tools
Digital Multi-meter
Frequency counter or digital multi-meter with frequency counter function.
Wiring diagram
Control Inner-Connection diagram
CHOPPER MODULE FUNCTION TEST
W RNING
F 61
TROUBLESHOOTING & REPAIR