Thanks, everyone who took the time to reply to my question.
Looks like ICT is worth the hassle, and our trend is in the right direction.
I'll forward some of the replies to our Production Manager. He could do
with the ammunition to justify the extra design costs etc.
regards,
Phil.
At 11:12 27/08/99 -0500, you wrote:
>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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===============================================================
Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer
Vision Abell Pty Ltd
Second Avenue, Technology Park,
Mawson Lakes. SOUTH AUSTRALIA 5095
Phone : (08) 8300 4400 (reception)
(08) 8300 4481 (direct)
Fax : (08) 8349 7420
email: [log in to unmask]
Internet Page: http://www.vsl.com.au
===============================================================
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