I've noticed that a lot of builder have been having problems with the 14
pin header on the AT-11. Here's what I found out.
There is a problem with the PC board hole size for J3 and D20. We switched
board manufacturers about two months ago and it looks like they went down
one hole size from what we gave them. There is a bit of confusion in the PC
board manufacturing world on how to specify holes sizes. Half of the
companies interpret the hole size we give as the "finished" hole size. The
other half of the companies take the holes size you give them and drill
that size hole. The second method creates a problem on plated holes because
the hole is now smaller by the width of the plating. That seems to be case
with our new company. We're in the process of trying to get that cleared up.
It sure has caused a mess though. Most, if not all, of the ones that went
out in Jan and Feb have this problem. The only proper solution for the
header is to solder it to the top of the pads. I have checked this out
before and it will work fine. D20 can be done the same way. I do not
recommend that the holes be drilled out. They do not make a smaller header
that will work. If it was smaller, then the ribbon cable would not fit
properly. Soldering on the top is pretty much the only way.
Dwayne Kincaid
WD8OYG
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LDG Electronics
1445 Parran Road, St. Leonad MD
Phone: 410-586-2177
Fax: 410-586-8475
e-mail: ldg@radix.net
web site: http://www.radix.net/~ldg
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