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If for any reason you do not understand the test procedures or are unable to perform the
tests/repairs safely, contact the Lincoln Electric Service Department for technical
troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
Service and Repair should only be performed by Lincoln Electric Factory Trained
Personnel. Unauthorized repairs performed on this equipment may result in danger to the
technician and machine operator and will invalidate your factory warranty. For your
safety and to avoid Electrical Shock, please observe all safety notes and precautions
detailed throughout this manual.
F-2
This Troubleshooting Guide is provided to
help you locate and repair possible machine
malfunctions. Simply follow the three step
procedure below.
Step 1. LOCATE PROBLEM (SYMPTOM).
Look under the column labeled “PROBLEM
(SYMPTOMS)”. This column describes
possible symptoms that the machinery may
exhibit. Find the listing that best describes
the symptom that the machine is exhibiting.
Symptoms are grouped according to:
functional problems and wire feeding
problems.
Step 2. PERFORM EXTERNAL TESTS.
The second column labeled “POSSIBLE
AREAS OF MISADJUSTMENT(S)” lists the
obvious external possibilities that may
contribute to the machine symptom. Perform
these tests/checks in the order listed. In
general, these tests can be conducted
without removing the case wrap-around
cover.
Step 3. PERFORM COMPONENT TESTS.
The last column labeled “RECOMMENDED
COURSE OF ACTION” lists the most likely
components that may have failed in your
machine. It also specifies the appropriate
test procedure to verify that the subject
component is either bad or good. If there are
a number of possible components, check the
components in the order listed to eliminate
one possibility at a time until you locate the
cause of your problem.
All the necessary test specifications and
repair procedures are described in detail
following the troubleshooting guide. All
electrical test points, terminal strips,
junctions, etc., can be found on the electrical
wiring diagrams and schematics in the
Electrical Diagram Section.
TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
WARNING
CAUTION
How To Use Troubleshooting Guide