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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
FUNCTION PROBLEMS
The fan motor does not run when
the machine is turned on.
1. Normal operation. The Multi-
Weld 350 utilizes a Fan On
Demand system. The fan
should activate when welding.
1. Carefully check for approxi-
mately 40VDC at the fan motor
leads (303+ to 300-). This test
must be performed while the
machine is connected to a resis-
tive load or welding. If the
40VDC is NOT present, check
the associated leads and plugs
for loose or faulty connections.
See the Wiring Diagram. If the
correct voltage IS present and
the fan is not running, the fan
motor may be faulty.
2. If the correct voltage (40VDC) is
not present in the above test,
perform the DC Buss Supply
Board Test.
3. The Weld Control Board may be
faulty. Replace.
The fan does not run when welding. 1. The fan should turn on when the
arc starts and remain on for
about a minute after the arc is
out.
F-9 F-9
TROUBLESHOOTING & REPAIR
MULTI-WELD 350
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