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F-5
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
CODE 9794 and ABOVE
No Wire feed, weld output or gas
flow when the gun trigger is pulled -
Fan operates normally.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Check the circuit breaker in the
machine – Located in the wire
drive compartment. Reset if
tripped.
2. The thermostat may be tripped
due to overheating. Let machine
cool. Weld within the duty cycle
or remove any air obstruction to
machine.
3. Wire feed motor may be over-
loaded – correct feeding prob-
lem.
4. Gun trigger may be faulty.
RECOMMENDED
COURSE OF ACTION
1. Check for 24 vac at plug 2J1 to
6J1 on the control board. If volt-
age is not present, check conti-
nuity of leads to fan motor. If
leads are OK, replace fan motor.
See Figure F.1
2. Remove main power supply to
SP-100. With gun trigger pulled
check for continuity (zero ohms)
from 8J2 (lead #213) to 9J2
(lead #211) at harness plug. If
zero ohms is indicated then trig-
ger circuit is OK. See Figure
F.1.
3. If an open circuit or high resis-
tance is indicated in Step 2, then
check leads #211, #212 and
#213 for loose or broken con-
nections. Also check the normal-
ly closed thermostat mounted on
the diode heat sink assembly.
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