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TROUBLESHOOTING & REPAIR
F-7 F-7
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 DC
auxiliary output voltage at the
115VDC receptacle. The welding
generator is functioning correctly.
1. Check the DC receptacle and
plug for loose or faulty connec-
tions.
2. Check the 15 Amp fuse. CSA
machines only.
1. Check for loose or faulty con-
nections or wires at the 115
VDC receptacle and associated
circuitry. See the Wiring
Diagram.
The actual welding current is much
less than is indicated on the dials.
1. Check the welding cables for
loose or faulty connections.
2. The welding cables may be
excessively long or coiled.
3. Check the main DC generator
brushes for good commutation
and alignment. Contact the
Lincoln Electric Service Dept.
1-800-833-9353 (WELD).
1. The engine RPM may be low. If
necessary perform the Engine
Throttle Adjustment Test.
2. Perform the DC Exciter Test.
3. 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.
4. Check the current range selec-
tor switch and contacts for prop-
er operation.
5. Perform the Main Generator
Shunt Field Winding Test.
6. The main armature may be
faulty. Check for grounds.
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