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LN-7 GMA WIRE FEEDER
TROUBLESHOOTING AND REPAIR F-9
PROBLEMS
(SYMPTOMS)
Wire feeder circuit breaker
tripping when the gun trigger
is pulled.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
Check for jammed wire or
“birdsnest” inside wire drive
compartment.
RECOMMENDED
COURSE OF ACTION
1. Check the current draw for the
wire feed motor. Insert a DC
ammeter in series with lead
#539 or #541 and the control
PC board.
2. If current draw IS excessive,
greater than 2 Amps, check for
rough turning gearbox by
turning by hand. If gearbox
turns roughly or grinds, replace
per Wire Drive Assembly and
Component Replacement
procedure.
3. If the gearbox is OK and the
motor current draw IS
excessive, then the motor or
motor brushes may be
defective. Check or replace.
4. If motor current draw is NOT
excessive, disconnect gas
solenoid leads from control PC
board terminals #7 and #32A. If
circuit breaker no longer trips,
solenoid may be defective.
Replace solenoid per Gas
Solenoid and Connections
Replacement Procedure.
5. The Control PC Board may be
faulty. Replace the Control PC
Board.
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.