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TROUBLESHOOTING & REPAIR
F-13 F-13
LINCOLN
®
ELECTRIC
IDEALARC DC-400
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Poor arc characteristics when
welding in the constant voltage
(CV) mode.
1. Make sure the correct weld pro-
cedures are being used.
(Electrode, Gas, Etc.)
2. Check the welding cables for
loose or faulty connections.
1. Check reed switch CR3 for
proper operation. Switch
should be normally open until
weld current is established.
2. Remove plug P6 from the start
board. If problem is resolved,
the start board may be faulty.
Replace. See Wiring Diagram.
3. Check the welding Mode
switch (S4), the microswitches,
and the associated wiring.
4. Check the output capacitors
and connections. A capacitor
failure is indicated if the small
vent plug on top of a capacitor
is raised or blown out.
WARNING: The liquid elec-
trolyte in these capacitors is
toxic. Avoid contact with any
portion of your body. Clean
up vented electrolyte using
rubber gloves and a water
damped cloth. Any elec-
trolyte which gets on skin,
clean with soap and water.
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.