TECHNET Archives

August 1999

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Enter your name here <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 27 Aug 1999 14:11:04 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (141 lines)
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
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in
> the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

ATOM RSS1 RSS2