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TROUBLESHOOTING & REPAIR
F-9 F-9
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
Poor stick electrode performance.
Arc pops out.
Check output welding cables.
Is electrode DRY? Try welding with
another electrode from a different
container.
Make sure you have the correct
electrode for your application.
1. Check for loose or burned con-
nections at choke, shunt, and
output studs. See wiring dia-
gram in Section G.
2. Test and inspect D6, D12, L1
and L2. See Wiring Daigram in
Section G.
Machine makes “squealing” noise
while under load when welding.
Output power is low (less than 20
VDC on meter @ 100 amps). Input
voltage 230 VAC or lower.
Check input lines and connections.
Check input voltage and reconnec-
tion procedures
1. See Switch Board test.
2. See Snubber Resistor test.
3. See Output Diode Test.
V300-PRO
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.