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TROUBLESHOOTING & REPAIR
F-9 F-9
RANGER 300 D AND 300 DLX
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, 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
No DC welding output. AC welding
output and auxiliary power are nor-
mal.
1. Make sure the polarity mode
switch (S1) is in the proper posi-
tion and is “seated” correctly.
2. Make sure the electrode and
polarity are correct for the
process being used.
1. Perform the Output Rectifier
Bridge Test.
2. Check the choke (L1), the polar-
ity mode switch (S1) and asso-
ciated 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.
No AC welding output. DC welding
output and auxiliary power are nor-
mal.
1. Make sure the polarity mode
switch (S1) is in the proper posi-
tion and is “seated” correctly.
2. Make sure the electrode is cor-
rect for the process being used.
3. Make sure the welding cables
are not coiled or too long.
1. Check the operation of the
polarity switch (S1). Also check
the associated wires for loose
or faulty connections. See the
Wiring Diagram.
2. Check for continuity from lead
“A1” to lead “A2.” See the
Wiring Diagram.