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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 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 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 electrical damage and electrical shock. Read the warning inside the static resistant bag and perform the following procedures:
PC board can be damaged by static electricity.
-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 static- shielding bag. This will prevent further damage and allow proper failure analysis.
4.Test the machine to determine if the failure symptom has been corrected by the replacement PC board.
NOTE: It is desirable to have a spare (known good) PC board available for PC board troubleshooting. (Some “test” boards are available to Service Facilities through the Parts Department).
NOTE: Allow the machine to heat up so that all electrical components can reach their operating temperature.
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 terminal strips. |
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ATTENTION |
Devices |
Handle only at |
Workstations |
-Remove your body’s static charge before opening the static- shielding bag. Wear an
-If you don’t have a wrist strap, touch an
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 PROBLEM,” will help avoid denial of legitimate PC board warranty claims.
-Tools which come in contact with the PC board must be either conductive,