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TROUBLESHOOTING & REPAIR
PC BOARD TROUBLESHOOTING PROCEDURES
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WARNING
ELECTRIC SHOCK can kill.
Have an electrician install and service this equipment. Turn the machine OFF before working on equipment. Do not touch electrically hot parts.
Sometimes machine failures appear to be due to PC board failures. These problems can sometimes be traced to poor electrical connections. To avoid prob- lems when troubleshooting and replacing PC boards, please use the following procedure:
1.Determine to the best of your technical ability that the PC board is the most likely component causing the failure symptom.
2.Check for loose connections at the PC board to assure that the PC board is properly connected.
3.If the problem persists, replace the suspect PC 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:
•Remove the PC Board from the
•If the PC Board uses protective shorting jumpers, don’t remove them until installation is complete.
•If you return a PC 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 PC board.
NOTE: Allow the machine to heat up so that all electri- cal components can reach their operating tem- perature.
5. Remove the replacement PC board and substitute |
it with the original PC board to recreate the original |
problem. |
a. If the original problem does not reappear |
by substituting 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 termi- |
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ATTENTION
PC Board can be damaged by static electricity.
•Remove your body’s static charge before opening the
•If you don’t have a wrist strap, touch an unpainted, grounded, part of the equipment frame. Keep touching the frame to prevent sta- tic
| nal strips. |
b. | If the original problem is recreated by the |
| substitution 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 PROB- LEM,” will help avoid denial of legitimate PC board warranty claims.
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•Tools which come in contact with the PC Board must be either conductive,