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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
ENGINE PROBLEMS
The engine shuts down shortly
after starting.
1. Check for adequate fuel supply.
2. If any indicator light is lit when
the engine shuts down, that par-
ticular system has faulted.
Check system.
3. Check the battery cables for
loose or faulty connections.
1. Check the RUN/STOP switch
and associated leads for loose
or faulty connections.
2. Perform the Shutdown
Solenoid Test.
3. The Peripheral PC board may
be faulty. With the RUN/STOP
switch in the "RUN" position, the
Peripheral PC board should nor-
mally supply 10VDC to the shut-
down solenoid via leads #224
and #262. See the Wiring
Diagram.
4. See the Engine Starting Diag-
nostic Chart.
The engine will not idle down to low
speed. The machine has normal
weld output and auxiliary power.
1. Make sure the IDLER switch is
in the "AUTO" position.
2. Make sure there is NOT an
external load on the weld termi-
nals nor the auxiliary power
receptacles.
3. Check for mechanical restric-
tions in the solenoid linkage.
1. Perform the Idler Solenoid
Test.
2. Check leads #227, #232L,
#232M and #226A for loose or
faulty connections. See the
Wiring Diagram.
3. The Pull Coil PC board may be
faulty.
F-10 F-10
TROUBLESHOOTING & REPAIR
COMMANDER 500
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