Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
TROUBLESHOOTING & REPAIR
F-75 F-75
RANGER 305D
WARNING
CONTROL POTENTIOMETER AND MODE SWITCH RESIS-TANCE TEST
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 elec-
trical 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 troubleshoot-
ing assistance before you proceed. Call 1-888-935-3877.
DESCRIPTION
This test will check the Output Controlpotentiometer, Arc Control potentiometer, Mode Switch,
and associated wiring for damage, proper operation, tracking, and grounds.
MATERIALS NEEDED
Digital Ohmmeter
Wiring Diagram
Control Inner-Connection Diagram