Lincoln Electric LN-25x Service Manual page 10

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Inconsistent wire feeding or
wire not feeding but the drive
rolls are turning.
Wire feed speed consistently
operates at the wrong speed.
The speed changes when the
control knob is adjusted.
The wire feeds but cannot be
controlled with the wire speed
pot.
When the trigger is pulled, the
wire feeds slowly.
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)
WIRE FEEDING PROBLEMS
1. The gun cable may be
kinked.
2. The wire may be jammed in
the gun cable.
3. The gun liner may be dirty or
worn.
4. The electrode may be rusty
or dirty.
5. The gun tip may be worn or
has splatter.
6. Improper gun liner, tip, drive
rolls or wire guides.
7. Incorrect pressure on the
wire drive rolls.
8. Spindle brake may be too
tight.
9. Worn drive rolls.
1. N.A.
1. N.A.
1. The Run-in function may be
ON.
LN-25x™ Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the Wire Drive
Motor Test Procedure.
1. Perform the Wire Drive
Motor Test Procedure.
1. Perform the Wire Drive
Motor Test Procedure.
2. Perform the Flexible Power
Supply Board Test Procedure.
3. Perform the User Interface
Board Test Procedure.
1. Perform the Wire Drive
Motor Test Procedure.
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