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TROUBLESHOOTING & REPAIR
F-13 F-13
COMMANDER 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 1-
800-833-9353 (WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
The welding arc is “cold.” The
engine runs normally. The auxiliary
power is normal. (Continued)
11. Check for poor connection at
J21 pins 1 & 4 at the CV daugh-
ter board. This is CVSCR gate
drive output. Will not affect
welding in the general fab or
pipe taps.
12. Check for poor connection
along lead #208 at the negative
CV output stud and at J21 pin 6
molex plug at the CV daughter
board. This is CV voltage feed-
back input. Will not affect weld-
ing in the general fab or pipe
taps.
13. Check the weld & CV chokes (if
so equipped) for turn to turn
shorts.
14. Check all waveforms as illus-
trated in the Oscilloscope
Waveforms Section.
15. Perform the Control Board
Power Supply Test.