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TROUBLESHOOTING & REPAIR | |
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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 elec- trically hot parts.
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CAUTION: Sometimes machine failures appear to be due to PC board failures. These problems can sometimes be traced to poor electrical connections. To avoid problems when troubleshooting and replacing PC boards, please use the following pro- cedure:
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 connect- ed.
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:
P.C. Board can be damaged by static electricity.
-Remove the P.C. Board from the
-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 symptom has been corrected by the replace- ment PC board.
NOTE: It is desirable to have a spare (known good) PC board available for PC board trou- bleshooting.
NOTE: Allow the machine to heat up so that all electrical components can reach their operating temperature.
5. Remove the replacement PC board and sub- | |
stitute it with the original PC board to recreate | |
the original problem. | |
a. | If the original problem does not reap- |
| pear by substituting the original board, |
| then the PC board was not the prob- |
| lem. Continue to look for bad connec- |
ATTENTION |
Devices |
Handle only at |
Workstations |
Reusable |
Container |
Do Not Destroy |
-Remove your body’s static charge before opening the
-If you don’t have a wrist strap, touch an unpainted, grounded, part of the equip- ment frame. Keep touching the frame to prevent static
| tions in the control wiring harness, |
| junction blocks, and terminal 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 fol- | |
lowed when warranty reports are to be submit- | |
ted. |
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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.
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-Tools which come in contact with the P.C. Board must be either conductive,