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).

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

OUTPUT PROBLEMS

The V350-Pro does not have weld-
ing output. The displays are lit.

1. Make sure the reconnect switch

is configured correctly for the
input voltage applied.

2. Make sure the Weld Terminals

Select is ON. If the problem is
solved the remote control
device or associated circuitry
may be faulty. See the wiring
diagram.

3. Put the Control Select in the

Local position. If the problem is
solved the remote control
device or associated circuitry
may be faulty.

4. If an error code is displayed see

Fault Code Explanations.

1. Check the reconnect switch and

associated leads for loose or
faulty connections. See the
wiring diagram.

2. Perform the Main Switch

Board Test.

3. Perform the Power Board

Test.

4. Perform the Output Diode

Module Test.

5. The control board may be faulty.

6. The input filter capacitors may

be faulty. Check and replace if
necessary.

7. The remote board may be

faulty.

The V350-Pro will not produce full
output.

1. The input voltage may be too

low, limiting the output capabili-
ty of the machine. Make cer-
tain the input voltage is correct
for the machine and the recon-
nect switch and jumper lead
configuration.

2. The welding current may be too

high . The machine will fold
back to 100 amps if the weld-
ing current exceeds 450 amps.

3. Make sure the machine is in

"Local" output control.. If the
problem is resolved the Remote
control board or the external
remote control unit may be
faulty.

1. Perform the Output Rectifier

Test.

2. Perform the Main Switch

Board Test.

3. Perform the Power Board

Test.

4. Perform the Current

Transducer Test.