The output terminals are always electrically “hot, Troubleshooting & repair, Caution – Lincoln Electric IDEALARC SVM 122-A User Manual
Page 55
TROUBLESHOOTING & REPAIR
F-11
F-11
LINCOLN
®
ELECTRIC
IDEALARC DC-400
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
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
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The output terminals are always
electrically “hot.”
1.
Make certain the Output
Terminals switch (S3) is in the
“REMOTE” position.
2.
Remove any external leads
hooked to the 14 pin amphenol
and/or the terminal strip. If the
problem disappears, the fault is
in the control cable or wire
feeder.
1. Check for an internal short
between leads #2 and #4. See
Wiring Diagram.
2. Check the Output Terminals
switch (S3) for proper opera-
tion. Also check associated
leads. See Wiring Diagram.
3. Remove plug P3 (SCR gate
leads) from the control board. If
the problem disappears, the
control board may be faulty.
Replace. If the output terminals
are still electrically “hot,” per-
form the SCR/Diode Rectifier
Bridge Test.
4. The snubber board may be
leaky. Check or replace.