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Where's DFM&T/Ce when you need it?
Earl Moon
----- Original Message -----
From: Charles Barker <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 27, 1999 9:12 AM
Subject: Re: [TN] In Circuit Test
> Phil,
>
> I ditto Jeff's remarks. We are ramping up a new product now. The design
engineer
> didn't pay much attention to ICT. He has had to go back and move stuff
around on
> a very dense board! Not a pleasent task. This has slowed down our ramp-up
rate
> considerably. We have also had to go out for a secind genertion test
fixture to
> accompdate the changes, which takes several weeks and costs beacoup US
$$$!
>
> As he mentioned, providing extra test nodes over and above the required
ones
> would be a feather in your cap! Of course, you don't want to over do this
point.
> If you have to spend an extra two or three days on a several week long
project
> squeezing in all the needed nodes, you will save the manufacturing process
> hundreds or even thousands of hours in the long run.
>
> This is not something you would do for small run boards, of course. I'm
talking
> anything complex that would be built in even just the hundreds per month.
It
> will save many hours of a technician's (quite often not that well trained)
time
> trouble shooting the finished critter.
>
> Good luck.
>
> Charlie Barker
> Sr. Manufacturing Engineer
> Input/Output, Inc.
> www.i-o.com
>
>
>
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
respond to
> [log in to unmask]
>
>
>
>
>
>
>
>
> To: [log in to unmask]
>
> cc: (bcc: Charles Barker/US/I-O INC)
>
>
>
> Subject: Re: [TN] In Circuit Test
>
>
>
>
>
> Phil Dutton wrote:
> >
> > Hello,
> > I was just wondering how people are dealing with ICT.
> > There is a big trend here (over the past year) to provide 100% nodal
access
> > for ICT.
> > A big problem is littering the secondary side of the boards with
suitable
> > test pads, taking up valuable routing area.
> > Often with SMT, the only vias on many of the nets, are to provide the
test
> > point. (single sided probing fixtures)
> > I can see there are some benefits of 100% ICT, but from a designer's
point
> > of view, we seem to be trading off the benefits of finer pitch devices.
> >
>
> Welcome to modern producibility.
>
> You can't ramp up production without automated test, if
> there's any kind of complexity to the product.
>
> You can't effectively do automated test without access to
> every functional pin of every device.
>
> The fun part? You should be providing access to unused
> functional pins as well.
>
> It's an opportunity to excel! The next step is to work up
> good verification of fixturing rules and then proper data
> handoff...
> --
>
> Jeff Seeger Applied CAD Knowledge Inc
> Chief Technical Officer Tyngsboro, MA 01879
> jseeger "at" appliedcad "dot" com 978 649 9800
>
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