Steve,
FWIW, we actually get quite a few boards without silkscreen or with minimal
silkscreen, not including all components. When we get it, its usually done
because of lack of usable space for marking, even away from the components.
Ideally in those cases, we get both X/Y data information for programming and
a marked up assembly drawing showing the locations for inspection. It's not
what we'd want if given the choice, but it's usually workable.
As for the square pad on pin 1, while it's pretty common, I don't think it's
any kind of standard. Again, we see a variety of uses for square pads, not
always indicating pin 1. Enough so that we discourage our operators from
making that assumption unless there's some other corroboration with other
markings or the customer verifies that is the case.
Rick
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen R. Gregory
Sent: Monday, February 14, 2000 4:13 PM
To: [log in to unmask]
Subject: [TN] Silkscreen, Pin-1 markings, etc....
Hi ya'll!
Is there anything that says a board should have silkscreened reference
designators on them, or pin-1 markings or indicators (like a square pad for
PTH locations) incorporated into the design?
I know there sometimes isn't room to put a reference designator right next
to
a location, but in those cases I've seen the designer find room someplace
else on the board and then arrange the reference designators in the order
that the parts are in, then have a line going to the beginning of that row
of
components. What I'm talking about usually I see when passive components are
so tightly spaced there's no other way.
I've hardly ever run across boards that didn't have some sort of way you
could tell what goes where...I've seen maybe 2 or 3 boards in all the time
I've been working, and that's including the board I have now.
So is there some sort of requirement, or is it just good sense to make
things
easier to build?
Thanks!
-Steve Gregory-
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