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(WELD).

WELDING PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

WELDING PROBLEMS

The machine does not have weld-
ing output in the Stick mode. Zero
volts open circuit voltage. The
Output LED on the control panel is
blinking. The machine operates
correctly in the TIG mode

1. Make sure the machine is prop-

erly set-up and configured for
Stick mode.

1. Check for output voltage feed-

back from the Output Filter
Board. See the Output Filter
Board Test.

2. Check for output voltage feed-

back through the Bus Board.
See the Bus Board Test.

3. The Control/Display Board may

be faulty.

The machine does not have weld-
ing output in either the Stick or TIG
modes. Zero volts open circuit.
The Output LED on the control
panel is blinking.

1. Make sure the correct input volt-

age is applied to the machine.
230 or 115VAC.

1. The output rectifier may be

faulty. Check and replace if nec-
essary. See the Secondary
Power Board Test and Wiring
Diagram.

2. The Output Clamp Board may be

faulty.

3. The Output Module Transistor

Board may be faulty. See the
Secondary Power Board Test
and Wiring Diagram.

4. Perform the Main IGBT Inverter

Board Welding Logic and
Inverter Test.

5. The Superimposition Board may

be faulty.

6. The Hall Effect device may be

faulty.

7. The Control/Display Board may

be faulty.

The machine operates properly in
the Stick and DC TIG modes. AC
TIG mode does not function prop-
erly.

1. Make sure the machine is set-up

and configured correctly for the
AC TIG mode.

1. The Output Module Transistor

Board may be faulty. See the
Secondary Power Board Test
and Wiring Diagram.

2. The Superimposition Board may

be faulty.

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