Lincoln Electric RANGER 305G EFI Service Manual page 16

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The weld output cannot be
adjusted with the front panel
output control knob in one or
more weld modes. The weld
output terminals have normal
OCV (Open Circuit Voltage).
The AC auxiliary power is
normal and the engine
operates normally.
The machine front panel output
control is still active when the
remote control unit is
connected to one of the
Amphenol Receptacles.
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.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELD OUTPUT PROBLEMS
1. Remote control devices
completely disable the front
panel control in all modes
except touch start TIG mode.
Make sure nothing is plugged
into either of the Amphenol
receptacles.
2. Check for dirt or moisture
contamination in either 6 pin or
the 14 pin Amphenol
receptacle.
1. The condition is normal in
"Touch Start TIG" mode. See
the Operation Section of the
Operators Manual.
2. The remote control unit may
be defective.
3. Check the Amphenol
receptacles. Look for damaged
or corroded contact pins in the
receptacle and in the plug of
the remote control unit.
Ranger® 305G EFI Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the Remote
Receptacle Resistance Test
Procedure.
2. The output control
potentiometer may be
defective.
3. Perform the Control
Potentiometer and Mode
Switch Resistance Test
Procedure.
1. Check plug P1 on the weld
control board. Plug should be
properly seated and pins in
both the plug and the PC board
jack must be clean and fit
tightly together.
2. There may be a poor
connection between the weld
control board and the
Amphenol receptacles. Check
for continuity between the
terminals. See Wring Diagram.
3. The weld control board may
be defective.
11