Lincoln Electric SVM189-B Service Manual page 58

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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 & 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
COMPACT WIRE WELDERS
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 6 and 3 on
plug J5 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. Make sure identity plug is not
missing on control board. See
Wiring Diagram.
6. Possible bad control board.
Replace.
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