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F-3
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident.
No wire feed, weld output or gas
flow when gun trigger is pulled. Fan
does NOT operate.
No weld output or wire feed when
gun trigger is pulled. Fan runs and
gas flows normally.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
Contact your LOCAL LINCOLN
AUTHORIZED FIELD SERVICE
FACILITY.
1. Make sure correct voltage is
applied to the machine (115
vac).
2. Make certain that power switch
is in the ON position.
Contact your LOCAL LINCOLN
AUTHORIZED FIELD SERVICE
FACILITY.
RECOMMENDED
COURSE OF ACTION
Contact the Lincoln Electric Service
Department. (216) 383-2531 or 1-
800-833-9353 (WELD)
1. Check for 115 VAC at input to
fan motor (leads #31 to #32). If
correct voltage is present and fan
motor does not function, replace
the fan motor. See wiring dia-
gram.
2. If 115 vac is not present at leads
#31 to #32, then check the power
switch and input line cord. (SI)
1. Check voltage from leads #202
to #201 at the output diode heat
sinks. Normal voltage is from 2
vac to 20 VAC, depending on arc
voltage control setting. If the cor-
rect AC voltage is present, check
the output diodes and connec-
tions. Also check the output ca-
pacitor, C1. See wiring diagram.
2. If the correct AC voltage is not
present at the diode heat sink
leads #202 to #201, then check
the AC voltage on the trans-
former (TI) primary leads #531 to
#32 (normal is 115 vac with arc
voltage control at maximum). If
the correct voltage is present at
the transformer primaries (#531
to #32), the transformer may be
faulty. See wiring diagram.
3. If the correct voltage is not pre-
sent at leads #531 to #32, then
check the arc voltage control
potentiometer (RI)and associated
wires #205, #206 and #207 for
loose or broken connections.
See wiring diagram.
4. The control board may be faulty
– Replace.
OUTPUT PROBLEMS
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.
CAUTION