Lincoln Electric POWER-ARC 4000 SVM103-A Service Manual page 44

F-3
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No weld output and no auxiliary
output - engine runs normally.
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.
POWER-ARC 4000
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. The generator brushes may be
worn or faulty. See the Main-
tenance section of this manual
or contact your local Lincoln
Electric Authorized Field Ser-
vice Facility.
CAUTION
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the Rotor Voltage Test.
2. If the rotor voltage is zero to 3
VDC, check the flywheel alter-
nator and associated wires
200A, 202, and 202A for conti-
nuity. The voltage from lead
200A to ground should be at
least 18 to 21 VDC at high idle
(3700 RPM). Normal voltage is
46 VDC. If the voltage is low or
missing, the flywheel alternator
may be faulty. See the wiring
diagram.
3. Check lead 201B (green) for
continuity (zero ohms)
ground. See wiring diagram.
4. The field capacitor (C1) or
bridge (D1) may be faulty. Test
or replace.
5. Test the rheostat (R1). Normal
resistance is 3.3 ohms. See the
Rheostst Replacement drawing.
6. The rotor may be faulty. Per-
form the Rotor Resistance Test.
to