Lincoln Electric INVERTEC STT Series Service Manual page 52

F-11
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Molten weld puddle appears exces-
sively "violent."
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)
WELDING PROBLEMS
1. The Wire Type switch may be in
the wrong position for the elec-
trode wire being used.
2. The Peak Current or Back-
ground Setting may be too high.
Adjust for optimum welding per-
formance.
3. The Tailout may not be set cor-
rectly for the process. (STT II
Only)
CAUTION
INVERTEC STT
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. The Darlington module may be
faulty. Check or replace.
2. The Darlington driver PC board
may be faulty.
3. The control PC board may be
faulty.
F-11
DEC 97