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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
OUTPUT PROBLEMS
The Multi-Weld 350 does not have
output. The meters turn on, the
input contactor activates and the
Thermal light is off.
1. Check the welding cables for
loose or faulty connections.
1. Check for loose or faulty con-
nections at the Control box, the
Chopper boards, and the
Analog Power Supply Board.
See the Wiring Diagram.
2. Check the heavy current carry-
ing leads at the choke, the
chopper boards, the shunt and
the output terminals for loose or
faulty connections. See the
Wiring Diagram.
3. Perform the Chopper Board
Input Voltage and Resistance
Test.
4. Perform the Analog Control
Power Supply Board Test.
5. The Weld Control Board may be
faulty. Replace.
F-6 F-6
TROUBLESHOOTING & REPAIR
MULTI-WELD 350
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