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TROUBLESHOOTING GUIDE Observe Safety Guidelines
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 meters light, but the input con-
tactor does not activate when the
ON/OFF Mode Selector switch is
turned on. The Multi-Weld 350
does not have output.
1. Make sure the input voltage
applied to the Multi-Weld 350 is
not greater than 113VDC.
1. Check leads 330 and 303A for
loose or faulty connections.
See the Wiring Diagram.
2. Perform the Input Contactor
Coil Resistance and Supply
Voltage Test.
3. The Peripheral Board may be
faulty.
4. The Weld Control Board may be
faulty.
The Thermal Light is on. The Multi-
Weld 350 does not have output.
The fan operates normally.
1. The output rating of the
machine may be exceeded.
See the Technical
Specifications.
2. Wait until the machine cools and
the Thermal Light goes out. The
machineís output should be
restored.
1. The Thermostat, located on the
input diode heat sink, may be
faulty.
2. Check leads 306, 307, 206, 207
and plugs J22 and J11 for loose
or faulty connections. See the
Wiring Diagram.
F-5 F-5
TROUBLESHOOTING & REPAIR
MULTI-WELD 350
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