Troubleshooting Guide - Lincoln Electric POWER MIG SVM170-A Service Manual

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TROUBLESHOOTING GUIDE

Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS
(SYMPTOMS)
Major Physical or Electrical Damage
is Evident
Machine is dead — no open circuit
voltage output and no wire feed
when gun trigger is pulled. The
machine display may be lit.
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.
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TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact
Electric Authorized Field Service
Facility.
1. Make certain that the input
power switch is in the "ON" posi-
tion.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
3. Blown or missing fuses in the
input line.
4. The thermostats may be open
due to machine overheating. If
machine operates normally after
a cooling off period then check
for proper fan operation and
ventilation. Make certain that the
machine's duty cycle is not
being exceeded.
5. Check the trigger circuit. Leads
#324 to #325 should have conti-
nuity (zero ohms) when the gun
trigger is pulled. If not then the
gun may be faulty — replace.
6. Make sure the machine is not
connected to a portable genera-
tor.
CAUTION
POWER MIG 255C
RECOMMENDED
COURSE OF ACTION
your local Lincoln 1. Contact The Lincoln Electric
1. Check input power switch (S1).
2. Check for lose or broken wires
3. Perform
4. Perform Rectifier Diode Bridge
5. Check the thermostats and
6. The control board may be faulty.
Service Dept. 1-888-935-3877
It may be faulty.
at the reconnect panel.
Main Transformer
Test.
Test.
associated leads for loose or
broken connections. See wiring
diagram.
Replace.
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