Lincoln Electric Classic 300 MP Service Manual page 19

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The engine will NOT go to high
speed when a load is applied to
the AC auxiliary receptacles.
The engine does go to high
speed when a load is applied to
the welding output terminals.
The engine will NOT go to high
speed when either a welding
load or an auxiliary load is
connected.
The machine has normal output
and engine speed when the
idler control switch is in the
"High" position.
The engine will not shut down.
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 1-888-935-3877.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Check the auxiliary power
plug and associated leads for
loose or faulty connections.
2. The load may be too small.
The load must be above 150
watts.
1. Check the welding cables
and auxiliary load leads for
loose or faulty connections.
1. Make sure the ignition
switch is turned off and
operating correctly.
Classic® 300 MP Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Check the leads associated
with the current transformer
for loose or faulty connections.
See Wiring Diagram.
2. Check the current
transformer for "opens" in the
windings.
3. Perform the Control Board
Test Procedure.
1. Perform the Engine Fuel
System Voltage Test Procedure
(ECU Test).
2. Perform the Control Board
Test Procedure.
1. Perform the Engine Fuel
System Voltage Test Procedure
(ECU Test).
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