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.

OUTPUT PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

OUTPUT PROBLEMS

The amber thermal light is lit. The
machine does not have welding
output, the fan runs and the digital
output display reads a value
greater than 100.

The amber thermal light is lit. The
machine does not have welding
output, and the fan runs. The dig-
ital output display reads a value
greater than 100.

The amber thermal light is lit. The
machine does not have welding
output, the fan does NOT run and
the digital output display never
reads a value greater than 100.

1. The machine is being over-

loaded and thus overheated.
Reduce the load to conform to
the rated output limits of the
Multi-Source machine. See
the Technical Specifications.

1. The machine may be internally

clogged with dirt and dust.
Clean the machine with clean
dry compressed air.

2. The cooling vents may be

obstructed or blocked.

3. The ambient cooling air may

be too hot.

1. Check the fan circuit breaker

located on the front panel.
Reset if tripped

1. The secondary lead thermostat

or SCR heat sink thermostat
may be faulty. Check and
replace if necessary. These
are normally closed devices.
Also check associated leads
for loose or faulty connections.
See the Wiring diagram.

2. The control board may be

faulty.

1. The fan motor may be faulty.

Disconnect and test using an
isolated 120VAC supply.

2. Check the leads #250, #253,

and #252 between the fan
motor, the circuit breaker and
the control board. See the
Wiring Diagram.

3. Make certain the 120VAC fan

voltage is being developed by
the main transformer. See the
Main Transformer Test.

4. Make sure the shunt and the

output display are operating
properly. See Display
Calibration Procedure.

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