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TROUBLESHOOTING & REPAIR
F-4 F-4
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
Major physical or electrical dam-
age is evident.
1. Contact your local Lincoln
Authorized Field Service
Facility.
1. Contact The Lincoln Electric
Service Dept. 1-800-833-9353
(WELD).
No weld output and no auxiliary
power. Engine operates normally.
1. Make sure the REMOTE switch
(S8) is in the proper position –
“MACHINE CONTROL” – if a
remote control unit is NOT con-
nected to the machine.
2. Check the brushes for wear and
proper contact to the rotor slip
rings.
1. Perform the Rotor Voltage
Test.
2. If the Rotor Voltage Test is nor-
mal, perform the Rotor
Resistance Test.
3. If the Rotor Voltage Test is NOT
normal, perform the Auxiliary
and Field Winding Voltage
Test. Then check the field
diode bridge (D2), the field
capacitor (C1), and the Output
Control (R3). Replace if neces-
sary.
4. The control board may be
faulty. Replace.