Lincoln Electric 11519 Service Manual page 50

F-4
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 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.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact
Electric
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® 255XT
1. Contact The Lincoln Electric
your local Lincoln
Authorized Field
1. Check input power switch (S1).
2. Check for lose or broken wires
3. Perform Main Transformer
4. Perform
5. Check the thermostats and
6. The control board may be faulty.
RECOMMENDED
COURSE OF ACTION
Service Dept. 1-888-935-3877
It may be faulty.
at the reconnect panel.
Test.
Rectifier Diode
Bridge Test.
associated leads for loose or
broken connections.
Wiring Diagram.
Replace.
F-4
See