Lincoln Electric IDEALARC DC-655 Service Manual page 51

F-9
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The Thermal Protection Light is on
but the fan does not run.
The fan runs continuously.
One or both of the optional digital
meters are not lit.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Check for obstructions that
could prevent the fan from turn-
ing.
1. Note: The fan is thermal con-
trolled. Under normal condi-
tions, it does not continuously
run.
1. Check for loose plugs P13 and
P12 at the digital meter PC
board.
CAUTION
IDEALARC DC-655
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
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.
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.
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.
F-9