Lincoln Electric Ranger 305D Service Manual page 63

F-9
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine welds, but it will not
maintain a steady output. The arc
may suddenly get hotter or cold-
er.(continued)
The weld output cannot be adjust-
ed with the front panel output con-
trol 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.
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.
TROUBLESHOOTING & REPAIR
All manuals and user guides at all-guides.com
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELD OUTPUT PROBLEMS
7. The weld cables may be coiled,
or wrapped around metal reels
or racks. This can cause exces-
sive electrical inductance in the
weld circuit. Try welding after
uncoiling the cables, or discon-
nect the existing weld cables
and attach a set of adequately
sized, short test cables.
1. Remote control devices com-
pletely disable the front panel
control in all modes except
touch start TIG mode.
sure nothing is plugged into
either of the Amphenol recepta-
cles.
2. Check for dirt or moisture cont-
amination in either 6 pin or the
14 pin amphenol receptacle.
CAUTION
RANGER 305D
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
6. The output control or arc control
potentiometers may be defec-
tive or grounded.
switch may also be faulty.
Perform
Potentiometer
Switch Resistance Test.
7. The Amphenol receptacles may
be contaminated or defective.
Perform
Receptacle Resistance Test.
8. Replace the weld control PC
board.
1. Perform
Receptacle Resistance Test.
2. The output control potentiome-
Make
ter may be defective.
3. Perform
Potentiometer
Switch Resistance Test.
F-9
The mode
the
and
Control
Mode
the
Remote
the
Remote
the
Control
and Mode