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TROUBLESHOOTING & REPAIR
F-6 F-6
LN-9 GMA Wire Feeder
Observe Safety Guidelines TROUBLESHOOTING GUIDE
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
The wire feed “coasts” when the
gun trigger is released.
1. Make sure the gun trigger is not
“sticking.”
1. The relay 1CR may be faulty.
Replace.
The gas solenoid does not activate
when the gun trigger is closed. The
wire feeds and arc voltage is pre-
sent.
1. If a K418 GMA Timer Kit or a
K419 Burnback Timer Kit is
installed, disconnect it and
replace it with the jumper plug.
If the problem is resolved, the
K418 or K419 is faulty.
1. With the gun trigger closed,
check for 115VAC at the power
PC board terminals #7A to
#32A.
a. If the 115VAC is present,
the solenoid may be faulty.
Replace.
b. If the 115VAC is NOT pre-
sent at terminals #7 and
#32, the relay CR1 on the
power PC board may be
faulty. Replace.
The gas solenoid stays open after
the gun trigger switch is released.
1. The gas solenoid may be stuck
in the open position.
1. With the gun trigger NOT
closed, check for 115VAC at the
power PC board terminals #7 to
#32A.
a. If the 115VAC is present,
the relay CR1 may be
defective.
b. If the 115VAC is NOT pre-
sent, the gas solenoid may
be defective.