Lincoln Electric RANGER 8 SVM107-B Service Manual page 47

F-7
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Machine has low welding output
and low auxiliary output.
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 (WELD).
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. The brushes may be worn.
Contact your local Lincoln
Authorized Service Facility.
2. The engine RPM may be low.
CAUTION
RANGER 8
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. If the engine HIGH IDLE RPM is
low, then perform The Throttle
Adjustment Test.
2. Perform the Rotor Voltage Test.
3. If the rotor voltage is low the
Field Capacitor (C1) or the Field
Bridge (D2) may be faulty. Test
and replace if necessary.
4. Check the Output Control
Potentiometer. Normal resis-
tance is 10,000 ohms.
check associated wiring for
loose or faulty connections.
5. The Rotor may be faulty.
Perform the Rotor Resistance
Test.
6. The Printed Circuit Board may
be faulty. Replace.
7. If the engine HIGH IDLE RPM is
OK, then the engine may have
lost horsepower and be in need
of major repair.
F-7
Also