POWER-ARC 4000
F-4
TROUBLESHOOTING
F-4
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the
Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
No weld output and no auxiliary
output - engine runs normally.
1. Perform the Rotor Voltage Test.
2. If the rotor voltage is zero to 3
VDC, check the flywheel alterna-
tor and associated wires 202
and 202A for continuity. The
voltage from lead 202 to ground
should be at least 0.5 to 1.5 VDC
at high idle (3700 RPM). Normal
voltage is approximately 45
VDC. If the voltage is low or
missing, the flashing circuit may
be faulty. See the wiring dia-
gram. Check diode D2 & lead
#202C.
3. Check lead 201B for continuity
(zero ohms) to 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. Perform
the Rotor Resistance Test.
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
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