Diagrams - Lincoln Electric 10120 Operator's Manual

E-7
PROBLEMS
(SYMPTOMS)
Thermal Protection Light comes ON
and fan does not run.
NOTE: Fan is thermal controlled and
does not continuously run when
machine is powered up.
Fan runs continuously.
One or both Digital Meters not light-
ing.
Digital Voltmeter not working proper-
ly or erratic display.
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
Observe all Safety Guidelines detailed througout this manual
POSSIBLE
PROBLEMS
1. Check for obstructions that could
prevent the fan from turning.
2. Check the fan control ciruit. See
wiring diagram.
3. The fan motor may be faulty.
4. The Thermal Fan/Snubber PC
board may be faulty. See PC
board LED information.
1. The Thermal Fan Thermistor may
be faulty. See wiring diagram.
2. The Thermal Fan/Snubber PC
board may be faulty. See PC
board LED information.
1. The meters may not be receiving
the voltages from the auxiliary
transformer. Check plug P13.
See wiring diagram.
2. The Digital meter PC board may
be faulty.
1. Meter may not be receiving auxil-
iary or sensing voltages. Make
sure plug P12 & P13 are securely
plugged into the Digital meter PC
board and also plug P3 is securely
plugged into the control board.
2. The may be an open in the volt-
age feedback circuit. See wiring
diagram.
3. The Digital meter PC board may
be faulty.
CAUSE
If all recommended possible areas of
misadjustments have been checked
and the problem persists, contact
your local Lincoln Authorized
Field Service Facility.
CAUTION
CV-655
RECOMMENDED
COURSE OF ACTION
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