Jumpers Tutor


MOST pcboards have jumpers. Jumpers tell the board what components or model you are installing this board into. Manufacturers make a board that might have many model applications. Besides the chip programming, it can also have jumpers you have to set.

You LIKELY will need to compare the old and new board's jumper settings.

To do so, first look for your jumpers.

The board below has TWO jumpers. One on the left is labeled "MODE" and has the 20a/50a jumper. (You can not see the 20a/50a in picture but it below "MODE" label.

The one on the right is labeled "FILTER"  and has "B" and "A" below it.

First, the one on the left will tell the board whether you are using 110-120vac (20a) OR 220-240vac (50a). This is critical.

The one on the right tells the board how long you want the filter cycle to be. 2 or 5 hours twice a day.

Jumpers can also tell the board what calibration of temperature you wants and other important facts. Typically you match your new board's jumpers to the old board and everything will operate fine.



Jumpers   Jumper2  

As shown, the MODE jumper on the left connects the center post and the post on the right. The jumper on the right labeled FILTER connects the center post and the post on the right also. This would tell the board incoming voltage and filter cycle length. If you had different needs, you would move the jumper and connect the center post and the other post.

EXCEPTION: On a few "jumpers", there are only TWO posts (not the 3 shown above). In these cases, if the 2 wires are connected by the jumper, it means one thing. If the 2 wires are not connect at all, another.


Setting your jumpers is critical. So matching the new board to the old is critical.

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