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TROUBLESHOOTING & REPAIR
F-6 F-6
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
No output or reduced output the first
time power is applied to machine.
Check input voltages, fuses, and
input voltage reconnect procedures.
See Installation section.
If high input (380 VAC or higher)
voltage is applied. Capacitors may
need conditioning.
Check continuity of 3-amp slow
blow fuse located on reconnect
panel.
See Input Filter Capacitor
Conditioning in this section
Output turns on momentarily, then
switches off and repeats cycle.
Check input voltages and recon-
nection procedures. See Instal-
lation section.
Check output terminal switch S4
and/or Remote Trigger Options
(i.e., wire feeders, guns, cables,
etc.).
1. See Thermal Protection AC
Trigger Circuit test.
2. See Overvoltage Protection
DC Trigger Circuit test.
3. See Capacitor Balance test.
NOTE: This test is necessary
only if machine is connected
for 380 VAC or higher.
4. See Switch PC Board test.
5. See Snubber Resistor test
Remote output control not function-
ing. Machine performs well on
LOCAL control.
Test or replace Output Remote
Control Device
1. Test Local/Remote Switch S3
with ohmmeter. See Wiring
Diagram in Section G.
2. Check continuity of local/remote
circuit. See schematic drawing
in Section G.
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.