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TROUBLESHOOTING & REPAIR
F-8 F-8
RANGER 300 D AND 300 DLX
OBSERVE SAFETY GUIDELINES
TROUBLESHOOTING GUIDE
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
Machine has low welding output
and low auxiliary output.
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 Field Service
Facility.
3. The Engine RPM may be low.
1. If the engine high idle RPM is
low, perform the Engine
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 poten-
tiometer (R3). Normal resis-
tance is 10,000 ohms. Also
check associated wiring for
loose or faulty connections.
5. The rotor may be faulty.
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.