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TROUBLESHOOTING & REPAIR
F-9 F-9
IDEALARC DC-655
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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
FUNCTION PROBLEMS
The Thermal Protection Light is on
but the fan does not run.
1. Check for obstructions that
could prevent the fan from turn-
ing.
1. The fan motor could be faulty.
Check or replace.
2. The Thermal Fan/Snubber PC
Board may be defective. See
the Thermal Fan/Snubber PC
Board LED Chart.
The fan runs continuously. 1. Note: The fan is thermal con-
trolled. Under normal condi-
tions, it does not continuously
run.
1. The Thermal Fan Thermistor
may be faulty. See the Wiring
Diagram.
2. The Thermal Fan/Snubber PC
Board may be defective. See
the Thermal Fan/Snubber PC
Board LED Chart.
One or both of the optional digital
meters are not lit.
1. Check for loose plugs P13 and
P12 at the digital meter PC
board.
1. The digital meter board may not
be receiving voltages from the
T1 transformer windings.
Perform the Main Transformer
Test.
2. Check the wiring between Plug
J13 and the associated leads at
the main transformer. See the
Wiring Diagram.
3. The digital meter PC board may
be faulty.