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 ##############################################################