Lincoln Electric RANGER 305G EFI Service Manual page 13

LINCOLN ELECTRIC
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.
Try welding after uncoiling the
cables or disconnect the
existing cables and weld with a
set of adequately sized short
test cables.
Ranger® 305G EFI Service Manual
not help, the engine should be
serviced.
7. Compare the volt and amp
readings shown on the external
meters with the readings
displayed on the machine's
front panel. If these readings
differ significantly, Perform the
Weld Control Board Feedback
Test Procedure.
8. If the maximum weld output
cannot be obtained even
though the engine maintains
correct RPM and the front
panel displays are reading
accurately. Check for damaged
conductors and loose or
damaged connections at each
of the large weld current
carrying conductors that
connect the stator, output
rectifier, chopper module,
choke, shunt and output
terminals. See the Wiring
Diagram.
9. If all of these connections
are good, Perform the Rotor
Voltage Test Procedure, the
Stator Voltage Test Procedure,
the Output Rectifier Test
Procedure.
10. Perform the Control
Potentiometer And Mode
Switch Resistance Test
Procedure. Perform the
Remote Receptacle Resistance
Test Procedure. Replace the
weld control board.
8