Lincoln Electric 11937 Service Manual page 18

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical
damage is evident.
Machine is dead - no open circuit
voltage, wire feed, gas flow when
trigger is pulled and fan does not
operate.
No weld output, wire feed, gas
flow when the trigger is pulled.
Fan does run.
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 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact your local Lincoln
Authorized Field Service
Facility.
1. Make sure correct voltage is
applied to the machine.
2. Make certain that the power
switch is in the "on" position.
3. Blown fuses in the input line.
Check circuit breaker on the
machine.
1. The thermostat may be open
due to machine overheating. If
machine operates normal after
a cooling off period then check
for proper fan ventilation,
remove any obstructions. Make
certain that the machine's duty
cycle is not being exceeded.
2. Gun trigger may be faulty.
CAUTION
WIRE FEEDER WELDER (180 MODEL)
RECOMMENDED
COURSE OF ACTION
1. Contact the Lincoln Electric
Service Dept.
1-888-935-3877.
1. Check input power switch (S1)
it may be faulty. See Wiring
Diagram.
2. Check lead connection and
correct function of circuit
breaker. See Wiring Diagram.
3. The Control P.C. Board may be
faulty
1. Check thermostat and
associated leads for loose
or broken connections. See
Wiring Diagram.
2. Remove main power supply
to the machine. With the
gun trigger pulled check for
continuity at pins 2 and 4 on
plug J2 on the control board.
3. Perform the Transformer Test.
4. Check all heavy current
carrying leads. Check for
loose or broken connections
at the transformer, choke and
rectifier.
5. Possible bad control board.
Replace.
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