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TROUBLESHOOTING & REPAIR
F-4 F-4
CLASSIC I
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The engine starts and runs at cor-
rect speed, but there is no, or very
low, welder output voltage. There
is no DC auxiliary output voltage.
1. Check for loose or missing
brushes in the DC exciter.
2. The exciter may need “flashing.”
See Flashing the Fields in this
section.
1. Check for loose or broken wires
between the exciter brushes
and the DC receptacle and the
fine current control field
rheostat.
See the Wiring Diagram.
2. Perform the DC Exciter Test.
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