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| TROUBLESHOOTING AND REPAIR |
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PC BOARD TROUBLESHOOTING PROCEDURES |
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| PC board | can be | |
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| WARNING |
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| damaged | by | static | |
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| ELECTRIC SHOCK |
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| electricity. |
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| can kill. |
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| - Remove your body’s | ||
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| static charge | before | |
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| Have an electrician install |
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| ATTENTION |
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| opening the | static- | |||
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| and service this equipment. |
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| shielding bag. Wear an | |||||
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| Turn the input power OFF |
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| Devices |
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| at the fuse box before |
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| Handle only at |
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| For safety, use a 1 Meg | ||||
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| working on equipment. Do |
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| ohm resistive cord con- | |||||
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| not touch electrically hot |
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| Workstations |
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| nected to a grounded | ||||
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| parts. |
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| Reusable |
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| part of the equipment | ||||
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| frame. |
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| Container |
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| Do Not Destroy |
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| - If you don’t have a | ||||
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| CAUTION | wrist strap, touch an unpainted, grounded, | |||||||||
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| part of the equipment frame. Keep touching | |||||||||
| Sometimes machine failures appear to be | the frame to prevent static | |||||||||||
| due to PC board failures. These problems | not to touch any electrically live parts at the | |||||||||||
| can sometimes be traced to poor electrical | same time. |
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| connections. To avoid problems when trou- | - Tools which come in contact with the PC | |||||||||||
| bleshooting and replacing PC boards, | ||||||||||||
| please use the following procedure: | board must be either conductive, | |||||||||||
| or |
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1. Determine to the best of your technical | - Remove the PC board from the static- | |
shielding bag and place it directly into the | ||
ability that the PC board is the most | ||
equipment. Don’t set the PC board on or | ||
likely component causing the failure | ||
near paper, plastic or cloth which could | ||
symptom. | ||
have a static charge. If the PC board cannot | ||
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2. Check for loose connections at the PC | be installed immediately, put it back in the | |
board to assure that the PC board is | ||
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properly connected. | - If the PC board uses protective shorting | |
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3. If the problem persists, replace the sus- | jumpers, don’t remove them until installation | |
is complete. | ||
pect PC board using standard practices | ||
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to avoid static electrical damage and | - If you return a PC board to the Lincoln | |
electrical shock. Read the warning | ||
Electric Company for credit, it must be in | ||
inside the static resistant bag and per- | ||
the | ||
form the following procedures: | ||
further damage and allow proper failure | ||
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| analysis. |
