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TROUbLESHOOTING | ||
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| P.C. bOARD TROUbLESHOOTING PROCEDURES |
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WARNING
ELECTRIC SHOCK can kill.
Have an electrician install and ser- vice this equipment. Turn the input power OFF at the fuse box before working on equipment. Do not touch electrically hot parts.
CAUTION: Sometimes machine failures appear to be due to P.C. board failures. These problems can some- times be traced to poor electrical connections. To avoid problems when troubleshooting and replacing P.C. boards, please use the following procedure:
1.Determine to the best of your technical ability that the P.C. board is the most likely component caus- ing the failure symptom.
2.Check for loose connections at the P.C. board to assure that the P.C. board is properly connected.
3.If the problem persists, replace the suspect P.C. board using standard practices to avoid static elec- trical damage and electrical shock. Read the warn- ing inside the static resistant bag and perform the following procedures:
P.C. board can be damaged by static electricity.
•If the P.C. Board uses protective shorting jumpers, don’t remove them until installation is complete.
•If you return a P.C. Board to The Lincoln Electric Company for credit, it must be in the
4.Test the machine to determine if the failure symp- tom has been corrected by the replacement P.C. board.
NOTE: It is desirable to have a spare (known good) P.C. board available for P.C. board troubleshooting.
NOTE: Allow the machine to heat up so that all electri- cal components can reach their operating tem- perature.
5. Remove the replacement P.C. board and substitute |
it with the original PC board to recreate the original |
problem. |
• If the original problem does not reappear by substi- |
tuting the original board, then the PC board was not |
the problem. Continue to look for bad connections |
in the control wiring harness, junction blocks, and |
terminal strips. |
ATTENTION |
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Devices |
Handle only at |
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Workstations |
Reusable |
Container |
Do Not Destroy |
•Remove your body’s static charge before opening the static- shielding bag. Wear an
•If you don’t have a wrist strap, touch an unpainted, grounded, part of the equipment frame. Keep touching the frame to pre- vent static
• If the original problem is recreated by the substitu- |
tion of the original board, then the PC board was |
the problem. Reinstall the replacement PC board |
and test the machine. |
6. Always indicate that this procedure was followed |
when warranty reports are to be submitted. |
NOTE: Following this procedure and writing on the warranty report, “INSTALLED AND SWITCHED PC BOARDS TO VERIFY PROBLEM,” will help avoid denial of legitimate PC board warranty claims.
•Tools which come in contact with the P.C. Board must be either conductive,
•Remove the P.C. Board from the
IDEALARC®