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Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
The welding output is high with no
control.
1. Check all input and output
cables for shorts. Check the
positive input and output cables
for “grounded” connections to
the machine’s case.
1. Check shunt feedback leads
R326, 327, R226, 227, plugs
P21 and P6, for loose or faulty
connections. See the Wiring
Diagram.
2. Check the continuity of leads
401, 301, 201, plugs P20, P22
and P31. See the Wiring
Diagram.
3. Check the Output Control R1
and the associated leads. See
the Wiring Diagram.
4. The Weld Control Board may be
Faulty.
No control of welding output. 1. The panel Output Control is dis-
abled when a remote control
device is plugged into the 6-pin
remote receptacle.
2. Check the welding cables for
loose or faulty connections.
1. Check the Output Control (R1)
and the associated leads for
loose or faulty connections.
2. Check all the plug connections
to the Weld Control Board for
loose or faulty connections.
See the Wiring Diagram.
3. The Weld Control Board may be
faulty. Replace.
F-10 F-10
TROUBLESHOOTING & REPAIR
MULTI-WELD 350
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