Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 73

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TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The display cannot be seen clear-
ly or cannot be seen at all.
Machine does not respond to
keys being pressed, or the
machine has improper displays.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Adjust the viewing angle of the
display. Follow the instructions
provided in the Operation
Section of this manual. (Look
under the "LCD DISPLAY
ADJUSTMENTS" in the "CON-
TROLS AND SETTINGS" sub-
section of the Operation
Section.)
1. Each time an overlay is
changed, make certain that the
machine is powered-up with
the new overlay in place.
2. Make certain that the correct
overlay ID number is displayed
on power-up. Refer to the
Operation Section of this
manual for the overlay descrip-
tion.
3. In some cases, some of the
keys on the overlay may be
locked out. Refer to the
Operation Section of this
manual for the overlay descrip-
tions.
CAUTION
POWER WAVE 450
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Perform the LCD Display Test.
1. Using the test and calibration
overlay L9660-255, perform
the keyboard/LED test. See
overlay.
2. Perform the Serial Loop
Wiring Harness Test.
3. Replace the control board and
perform voltage calibration and
current calibration.
4. Replace the display board and
perform voltage calibration.
5. Replace the power board.
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