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May 2006

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TechNet E-Mail Forum <[log in to unmask]>
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Tue, 16 May 2006 10:37:02 -0500
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TechNet E-Mail Forum <[log in to unmask]>, Franklin D Asbell <[log in to unmask]>
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Franklin D Asbell <[log in to unmask]>
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I really makes sense considering the only use for silkscreen in these times
are hand placement of components and perhaps rework or removal and repair of
said components.

I've talked to many CM's and OEM's who've stated they could care less about
the symbolization only to the point it affects component placement.

A show of hands now, who would be comfortable with removing symbol
altogether? Pros of such action, Cons of such action?

Franklin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75)
Sent: Tuesday, May 16, 2006 10:31 AM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen on pads

This is one of the reasons I don't allow silkscreen on my expensive
printed wiring boards that have to be soldered. I get grief from
everyone, but I never have to scrap a perfectly good functional printed
wiring board, because of a poorly executed questionable at best
manufacturing aid.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, May 16, 2006 5:55 AM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen on pads

It depends.
If the artwork covers major parts of the pads critical to the strength
of the solder joint, then it needs to be removed. If it is a situation
where a very small amount of the epoxy overlaps onto the very edges of
the pads, it may not be so critical. The boards are not any good if even
one pad has an open.
I know that removing the artwork epoxy can be extremely difficult.
I would suggest the board vendor get on the stick and start a rework
process for removing the epoxy. You should reach an agreement that any
rework on your part is paid for by the board vendor.
After the vendor provides you with 100 of the reworked pwbs, build them
up and see how they solder before accepting any more.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Black, Paul
Sent: Tuesday, May 16, 2006 7:46 AM
To: [log in to unmask]
Subject: [TN] Silkscreen on pads

Hi Fellow TechNetters,

I am expecting a fabbed board for our first leadfree production build
next month and have just been informed by the supplier that the artwork
contained silkscreen on quite a few of the solderable SMT pads. They
didn't catch it in time, so now they are asking is we could accept the
boards (qty = 1000) this one time. My PCB spec does not allow silkscreen
on any solderable surface, so I could reject the boards, but my concern
is that there may not be enough time to have more boards fabricated in
time for this build. I know that the boards wouldn't be acceptable per
IPC-A-610, but does anyone have any experience with this situation and
the best way to handle it?

Thank you,
Paul Black
Manufacturing Engineer
Kronos

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