Lincoln Electric RANGER 305G EFI Service Manual page 17

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine seems to be
locked into the "CC-STICK"
mode of operation.
The arc quality is poor with
excessive spatter. The arc heat
can be controlled and
maintained normally, the
auxiliary output is normal and
the engine operates normally.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELD OUTPUT PROBLEMS
1. Check the position of the
weld mode selector switch. The
switch should cleanly snap into
each mode position and should
not feel gritty or get hung-up
between positions.
1. The arc control may be set
too high. Try using a lower
setting.
2. The output control may be
set too high for the electrode
being used. Try welding at a
lower setting.
3. Check that the electrode
used is of good quality, dry and
free of contamination. Try
using a new Lincoln Electrode
and set the machine per the
Lincoln's recommendations.
4. If shielding gas is used, check
that the correct gas is being
used and that the gas flow is
set correctly. Check the gas
system for damaged, pinched
or leaking hoses.
Ranger® 305G EFI Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Check that plug P7 is fully
seated into the weld control
board socket. See Wiring
Diagram. Check for corroded,
dirty or damaged Molex
terminals in plug P7. Also
check for similar problems in
socket J7 on the weld control
board. Check the wiring
between the weld control
board and the mode switch.
Look for poor crimp and solder
connections as well as
damaged wiring or insulation.
See Wiring Diagram.
2. Perform the Control
Potentiometer and Mode
Switch Test Procedure.
3. The weld control board may
be defective.
1. Check that the weld circuit is
not grounded. With the engine
off, check the resistance
between the chassis ground
and the weld output terminals.
The resistance should be very
high, a reading of 500,000
(500k) ohms or higher is
acceptable.
2. The weld control system
may be grounded or
malfunctioning. Perform the
Control Potentiometer and
Mode Switch Test Procedure
and the Remote Receptacle
Resistance Test Procedure.
3. The Chopper module may be
defective. Perform the
Chopper Module Resistance
12