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TROUBLESHOOTING & REPAIR
F-5 F-5
CLASSIC I
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
The engine starts and runs at the
correct speed but there is no, or
very low, welder output. The DC
auxiliary output voltage is normal.
1. Check the welding cables for
loose or faulty connections.
2. Check for loose or missing
brushes in the welding genera-
tor.
1. Check the fine current control
field rheostat for resistance and
proper operation. Normal resis-
tance is 64 ohms. Check asso-
ciated wires for loose or faulty
connections. See the Wiring
Diagram.
2. Perform the Main Generator
Shunt Field Winding Test.
3. Check the continuity of the inter-
pole coils. They should show
continuity from the positive
brusholders to the positive out-
put terminal and should NOT be
grounded to the generator
frame.
4. Check the continuity of the
series coils. They should show
continuity from the negative
brusholders, through the current
selector switch, to the negative
output terminal and should NOT
be grounded to the generator
frame.
5. The main armature may be
faulty. Check for grounds and/
or shorts.
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