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
216-383-2531 or 1-800-833-9353.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

FUNCTION PROBLEMS

Circuit breaker (5 amp) repeatedly
trips when the gun trigger is acti-
vated.

1. Check or replace gun trigger

and leads. Make sure the trig-
ger leads are not shorted to the
electrode or work cables.

1. Disconnect lead #500 from the

trigger board. If the breaker still
trips when the gun trigger is
activated, the trigger board may
be faulty. Replace

2. Disconnect any accessory that

may be connected to terminals
#7 and #32A. See the Wiring
Diagram. If the problem is
resolved, the accessory may be
faulty. Replace.

3. Perform the

Wire Drive Motor

Test.

4. The power PC board may be

faulty. Replace.

Circuit breaker (5 amp) trips when
power is applied to the LN-9. Gun
trigger is NOT activated.

1. Disconnect any kits that may be

incorporated in the LN-9 (K202,
K319, etc.). Be sure to install
any necessary jumper plugs. If
the problem is resolved, the
fault may be in the disconnect-
ed kit.

1. Disconnect lead #620 from trig-

ger board. See the Wiring
Diagram. If the problem is
resolved, the trigger board may
be faulty. Replace.

2. Perform the

T2 Transformer

Test.

3. Check the harness leads #32A,

#31, and #531 for shorts or
grounds. See the Wiring
Diagram.

4. The power PC board may be

faulty. Replace.

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