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

Major physical or electrical damage
is evident.

No welding output in either CV or
Stick modes. Auxiliary power is nor-
mal and engine operates normally.

Contact your local Lincoln
Authorized Field Service Facility.

1. Place the Welding Terminals

switch in the “ALWAYS ON”posi-
tion. If the problem is solved, the
fault may be in the external con-
trol cable (if used), Leads #2 and
#4. See the Wiring Diagram.

Check the welding cables,
clamps, and electrode holder for
loose or faulty connections.

3. With the engine at high idle

(1900 RPM), and the machine in
the general fab tap, Check for
the presence of 70VDC at the
output terminals of the
Commander 400.

Contact the Lincoln Electric
Service Department. 1-800-833-
9353 (WELD).

1. Check for loose or faulty con-

nections on the heavy current
carrying leads between the out-
put bridge and the output termi-
nals. Also check for broken
leads at the weld choke. See
the Wiring Diagram.

Check the welding terminal
switch (S6) and leads 2 &4 back
to J8 pins 2 & 3 of the control
board.

3. Check for poor connections at

J6 pins 1,2 & 3 molex plug at the
control PC board. Also check
leads G1,G2 & G3 to each SCR.
These are SCR gate drive out-
puts.

4. Check leads W1 thru W6 for

loose or faulty connections. See
the wiring diagram.

5. Perform the Stator Voltage Test.

6. Perform the SCR/Diode Bridge

Test.

7. Perform the Control Board

Power Supply Test.

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