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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
FUNCTION PROBLEMS
The meters do not light in either CV
or CC modes.
1. In the CC mode, only the AMPS
meter will light. In the CV mode,
only the VOLTS meter will light.
1. Check all the plug connections
to the Weld Control Board for
loose or faulty connections.
See the Wiring Diagram.
2. Check the leads and connec-
tions between the meters and
the Weld Control Board. See
the Wiring Diagram.
3. Perform the Analog Control
Power Supply Board Test.
4. The meters may be faulty.
5. The Weld Control Board may be
faulty. Replace.
One or both of the meter’s readings
are not accurate.
1. Make sure the test or external
meter is reliable and accurate.
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 integrity of lead 237
at plug P12 on the Weld Control
Board and also at plug P31 on
the Peripheral Board.
3. See the Digital Meter Calibra-
tion and Adjustment Test in
the Maintenance section.
4. Perform the Analog Control
Power Supply Board Test.
5. The Weld Control Board may be
faulty. Replace.
F-8 F-8
TROUBLESHOOTING & REPAIR
MULTI-WELD 350
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