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F-4
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident.
The Multi-Weld 350 is completely
dead. The meters do not light and
the input contactor does not acti-
vate when the ON/OFF Mode
Selector switch is turned on.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact your local Lincoln
Authorized
Facility.
1. Make sure the power source is
working properly and supplying
at least 50VDC to the Multi-
Weld 350. The electrode cable
must be positive polarity and the
work cable negative polarity.
2. Check the electrode and work
cables for loose or faulty con-
nections.
CAUTION
MULTI-WELD 350
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Contact the Lincoln Electric
Field
Service
Service Department at 1-800-
833-9353 (WELD)
1. Measure the input voltage to the
Multi-Weld 350.
between 50 and 113VDC.
2. The ON/OFF Mode Selector
switch (S1) may be faulty.
Check and replace if faulty. See
the Wiring Diagram. Also check
associated wiring.
3. The input diode D1/D2 may be
open. Check. See the Wiring
Diagram.
4. Perform the DC Buss Supply
Board Test.
5. Perform the Analog Control
Power Supply Board Test.
6. The Weld Control Board may be
faulty. Replace.
F-4
It must be
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Troubleshooting
