F-9 F-9
RANGER 305D
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TROUBLESHOOTING & REPAIR
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.
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
WELD OUTPUT PROBLEMS
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.
1. Remote control devices com-
pletely disable the front panel
control in all modes except
touch start TIG mode. Make
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.
1. Perform the Remote
Receptacle Resistance Test.
2. The output control potentiome-
ter may be defective.
3. Perform the Control
Potentiometer and Mode
Switch Resistance Test.
The machine welds, but it will not
maintain a steady output. The arc
may suddenly get hotter or cold-
er.(continued)
7. The weld cables may be coiled,
or wrapped around metal reels
orracks. 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.
6. The output control or arc control
potentiometers may be defec-
tive or grounded. The mode
switch may also be faulty.
Perform the Control
Potentiometer and Mode
Switch Resistance Test.
7. The Amphenol receptacles may
be contaminated or defective.
Perform the Remote
Receptacle Resistance Test.
8. Replace the weld control PC
board.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual. TROUBLESHOOTING GUIDE