Troubleshooting & repair, Caution – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 44
TROUBLESHOOTING & REPAIR
F-7
F-7
PRO-CUT 55
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
1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
CUTTING PROBLEMS
The pilot arc is normal, but the arc
will not transfer to the workpiece.
1. Make sure the operating proce-
dure is correct for the process.
See the Operation section of
this manual.
2. Make sure the work clamp is
connected tightly to the work-
piece.
3. The workpiece must be electri-
cally conductive material.
1. Check the lead connections X2,
X4 and B21 at the output board.
2.
Check the output control
potentiometer (R1). Normal
resistance is 10 ohms. Also
check the associated leads for
loose or faulty connections to
the display board. See the
Wiring Diagram.
3. Check leads #216, #218 and
#219 between the display
board and the control board.
Check for loose or faulty con-
nections. See the Wiring
Diagram.
4.
The control board may be
faulty. Replace.
5. The output board may be faulty.
Perform the Output Board
Resistance Test.
6.
The display board may be
faulty. Replace.