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F-12 F-12
LN-9 Wire Feeder
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
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.