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

OUTPUT PROBLEMS

Major physical or electrical dam-
age is evident.

1. Contact the Lincoln Electric

Service Dept. 1-800-833-9353.

The machine is dead - the input
contactor does not operate. The
pilot light is not lit.

1. The power switch (S1) is in the

ON position.

2. Check for blown or missing

fuses in the input lines.

3. Check the three-phase input

line voltage at the machine.
The input voltage must match
the rating plate and reconnect
panel.

1. Check the power switch (S1)

and associated leads and con-
nections. See the Wiring
Diagram.

2. Perform the Control Trans-

former Test.

The input contactor operates, but
no welding output. The 115 VAC
auxiliary supply is present at the
receptacle.

1. Check the electrode and work

cables for loose or faulty con-
nections.

2. If the Thermal Protection Light

is ON, the machine is overheat-
ed. Wait for the machine to
cool and remedy the cause of
the overheating problem. See
the Fan/Snubber Board LED
Chart.

3. Make certain either the output

terminals switch is in the ON
position or the external gun
trigger circuit is functioning
properly.

1. Perform the Internal Trigger

Circuit Test.

2. Perform the Firing Board Test.

3. Perform the Main Transformer

Test.

4. Perform the SCR Output

Bridge Test.

The control board may be
faulty. See Control Board LED
Chart.

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