Troubleshooting & repair, Caution – Lincoln Electric CLASSICII SVM125-A User Manual
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TROUBLESHOOTING & REPAIR
F-5
F-5
CLASSIC II
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 216-
383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The engine starts and runs at cor-
rect speed, but there is no, or very
low, welder output voltage. The AC
auxiliary output voltage is normal.
1. Check for loose, damaged or
missing brushes in the welding
generator.
2. Check the welding cables for
loose or faulty connection.
1.
Check the Fine Current
Adjustment rheostat for resis-
tance and proper operation.
Normal resistance is 64 ohms.
Check associated wires for
loose or faulty connections.
See the Wiring Diagram.
2. Perform
the
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 Range selector switch,
to the negative output terminal
and should NOT be grounded.
Also check the Selector Switch
for proper operation.
5. The main armature may be
faulty. Check for grounds and/
or shorts.