Lincoln Electric RANGER SVM148-B Service Manual page 67

F-8
OBSERVE SAFETY GUIDELINES
DETAILED IN THE BEGINNING OF THIS MANUAL.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If a remote control unit is NOT
connected to the machine,
make sure the REMOTE switch
is in the proper position -
"MACHINE CONTROL."
2. The brushes may be worn.
Contact your local Lincoln
Authorized
Facility.
3. The Engine RPM may be low.
CAUTION
RANGER 300 D AND 300 DLX
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. If the engine high idle RPM is
low,
Throttle Adjustment Test.
2. Perform the Rotor Voltage
Test.
3. If the rotor voltage is low, the
field capacitor (C1) or the field
Field Service
bridge (D2) may be faulty. Test
and replace if necessary.
4. Check the output control poten-
tiometer (R3).
tance is 10,000 ohms.
check associated wiring for
loose or faulty connections.
5. The
Perform the Rotor Resistance
Test.
6. The control board may be faulty.
Replace.
7. If the engine high idle RPM is
OK, the engine may have lost
horsepower and be in need of
major repair.
F-8
perform the Engine
Normal resis-
Also
rotor may be faulty.