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TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
F-4
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is present.
When gun trigger is pulled
there is no wire feed, no gas
flow, and no arc voltage from
power source.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
Contact Lincoln Electric Service
Department (216-383-2531) or
1-800-833-9353 (WELD).
1. Make sure power source is on
and supplying 115 VAC to the
wire feeder.
2. Check the 2.5 Amp circuit
breaker. Reset if tripped.
3. Check the Ground Lead
Protector - reset if necessary.
4. Check the gun trigger circuit.
5. The control cable may be faulty.
Repair or replace.
6. 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.
RECOMMENDED
COURSE OF ACTION
1. Check for the presence of 115
VAC at the input control cable
receptacle. Pin “D” (#31) to Pin
“C” (#32).
2. Test the R1 resistor. 2 Ohms -
25 Watts.
3. Perform the Control Relay Test.
4. Perform the Trigger Trans-
former Test.
5. Check leads #524 and #525 for
continuity (zero Ohms) from the
gun control cable receptacle to
the control board plug J102.
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
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.