Lincoln Electric RANGER SVM120-A Service Manual page 61

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
216-383-2531 or 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
Authorized
Facility.
3. The Engine RPM may be low.
CAUTION
RANGER 10-LX
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. If the engine high idle RPM is
low,
Adjustment Test.
2. Perform the Rotor Voltage
Test.
3. If the rotor voltage is low, the
local Lincoln
field capacitor (C1) or the field
Field Service
bridge (D2) may be faulty. Test
and replace if necessary.
4. Check
potentiometer (R1).
resistance is 10,000 ohms.
Also 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, then the engine may have
lost horsepower and be in need
of major repair.
F-7
Observe Safety Guidelines
perform the Throttle
the output control
Normal
rotor may be faulty.