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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Welder runs but fails to generate
current.
Welding arc is loud and spatters
excessively.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
POSSIBLE CAUSE
FUNCTION PROBLEMS
Generator or exciter brushes may
be loose or missing.
Exciter may not be operating.
Field circuit of generator or exciter
may be open.
Polarity reversing switch may be in
the neutral position.
Exciter may have lost excitation.
Series field circuit may be open cir-
cuited.
Current setting may be too high.
Polarity may be wrong.
CAUTION
SAE400 & SAE400 WELD'N AIR
RECOMMENDED
COURSE OF ACTION
Be sure that all brushes bear on the
commutator and have proper spring
tension.
Check exciter output voltage with
voltmeter or lamp.
Check for open circuits in rheostat,
field leads and field coils. Also check
resistors.
Put handle in positive or negative
position.
Check components and continuity in
flashing circuit.
Check circuit with ringer or volt-
meter.
Check setting and current output
with ammeter.
Check polarity. Try reversing polarity
or try an electrode of the opposite
polarity.
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