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F-6 TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
PROBLEMS
(SYMPTOMS)
When the gun trigger is pulled the
wire feeds, the gas flows, but there
is NO arc voltage. (The wire does
not arc on the work piece.)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Check the welding cable for
loose or faulty connections.
2. Check or replace the gun.
3. If a burnback or timer kit is
used, unplug J104 from the
control PC board and install the
jumper plug. See wiring
diagram. If the problem is
solved then the timer or
burnback kit may be defective.
4. Check to see if OCV (open
circuit voltage) is present at the
power source welding output
terminals. If the OCV IS present
at the power source output
terminals then the problem is
external to the power source.
(The problem is in the welding
cables, wire feeder, or gun.)
5. If the OCV is NOT present at the
power source output terminal
then contact your Local Lincoln
Authorized Field Service
Facility.
RECOMMENDED
COURSE OF ACTION
1. Jumper the trigger leads at the
power source. (Either #2 to #4 if
on a terminal strip, or “C” to “D”
if on a 14 pin amphenol type
connector.) If the power source
produces the correct open
circuit voltage then the power
source is functioning correctly.
(The problem is with the control
cable, the wire feeder, the
welding cables, or the gun.) If
the power source does not
produce OCV, then the power
source is faulty.
2. The F101 fuse in the wire
feeder may be faulty. Test or
replace.
3. Perform the Control Cable
Continuity Test.
4. Perform the Control Relay Test.
5. Check the continuity of leads
#2 and #4 from the control
cable receptacle to the control
board plug J101. See wiring
diagram.
6. The control PC board may be
faulty. Replace per Control PC
Board Replacement procedure.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln
Electric Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
FUNCTIONAL PROBLEMS (Continued)
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components. See Wiring Diagrams for troubleshooting of specific circuits.