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TROUBLESHOOTING & REPAIR
F-4 F-4
CLASSIC II
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
216-383-2531 or 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 AC auxiliary output voltage.
1. Check the 15 amp fuse located
on the inside of the front control
panel.
2. If the welder output is zero volts,
the fields may need to be
flashed. See
Flashing the
Fields
in this section.
3. Check for loose or missing
brushes in the exciter alternator
and welding generator.
1. Check the “flashing” diode and
associated leads connected
between the generator brushes
and the exciter alternator brush-
es.
2. Check the field diode bridge
and associated leads and con-
nections. See the Wiring
Diagram.
3. Perform the
Alternator Rotor
Test.
4. Check for “opens” or shorted
turns in the alternator stator
windings. The coils must NOT
be grounded to the stator lami-
nation.