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LN-7 GMA WIRE FEEDER
TROUBLESHOOTING AND REPAIR F-7
PROBLEMS
(SYMPTOMS)
When the gun trigger is pulled there
IS wire feed and arc voltage but
there is NOT any gas flow.
Meter kit does not function.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Check the shielding gas source
for proper connections and
pressures.
2. Check for kinked or loose gas
hose connections.
3. If a 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 kit may be
defective.
1. Ensure lead #567 is connected
to the conductor block in the
wire drive compartment.
2. Check lead #21 for proper
connection. See Connection
Diagrams in the Installation
Section.
RECOMMENDED
COURSE OF ACTION
1. When the gun trigger is pulled
check for the presence of 115
VAC at leads #7 and #32A. If
115 VAC is present and the gas
solenoid does not activate then
the solenoid may be defective.
Replace per Gas Solenoid and
Connections Replacement
procedure.
2. If the 115 VAC is NOT present
at #7 and #32A then perform
the Control Relay Test.
3. The control board may be
faulty. Replace per the Control
PC Board Replacement
procedure.
1. Check meter kit cable
connector in the control box for
a tight connection.
2. For digital meter kit: ensure
wires #508 and #509 are
connected on the control PC
board.
3. Perform the Trigger Trans-
former Test.
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.