Lincoln Electric Idealarc DC600 9773MSP Service Manual page 52

TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Poor arc starting when the DC600
is in the CV Sub-Arc or CV
Innershield Modes.
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 216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELDING PROBLEMS
1. Make sure the proper welding
procedures are being used.
(wire feed speed , arc voltage
and wire size)
2. Check weld cables for loose or
faulty connections.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check the CR3 reed switch.
The voltage from lead #215 to
lead #220 should be 8VDC
when the DC600 is in an idle
condition (on but not welding).
When the machine is produc-
ing welding current the reed
switch (CR3) should close and
the voltage from #215 to #220
should drop to zero.
2. Perform the Firing Board test.
3. Perform the SCR Output
Bridge test.
4. The control board may be
faulty. - Replace.
IDEALARC DC-600
F-11