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LINCOLN ELECTRIC
Troubleshooting & Repair
Service and repair should be performed by only 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.
This Troubleshooting Guide is provided to help
you locate and repair possible machine
malfunctions. Simply follow the three-step
procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM). Look
under the column labeled "PROBLEM"
(SYMPTOMS). This column describes possible
symptoms that the machine may exhibit. Find the
listing that best describes the symptom that the
machine is exhibiting. Symptoms are grouped
into three main categories: Function Problems,
Wire Feeding Problems and Welding 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 cover.
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.
HOW TO USE TROUBLESHOOTING GUIDE
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 good or bad. 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 of the referenced test procedures referred to
in the Troubleshooting Guide are described in
detail at the end of this section. Refer to the
Troubleshooting and Repair Table of Contents to
locate each specific Test Procedure. All of the
referred to test points, components, terminal
strips, etc., can be found on the referenced
electrical wiring diagrams and schematics. Refer
to the Electrical Diagrams Section Table of
Contents to locate the appropriate diagram.
LN-25x™ Service Manual
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Table of Contents
Troubleshooting
