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TROUBLESHOOTING & REPAIR
F-6 F-6
RANGER 300 D AND 300 DLX
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, con-
tact 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
OUTPUT PROBLEMS
(continued from page F-5) 3. Check the reactor, range switch
(S2) and associated wires for
loose or faulty connections.
Check the reactor winding for
continuity and test to be sure it
is NOT grounded to the reactor
iron.
4. Check the choke (L1), polarity
mode switch (S1), and associ-
ated wires for loose or faulty
connections. Check the choke
winding for continuity and test
to be sure it is NOT grounded to
the choke iron.
5. Check the weld output termi-
nals and associated wires for
loose or faulty connections.
6. Perform the Output Rectifier
Bridge Test.