Here is some additional information on the suspected manufacturing problem from NASA: *** we have some circuit boards that have developed open connections when we apply pressure, heat or vibration. we destroyed one of the boards to create these cross sections. 40% of the via connections on one layer developed problems as depicted in the cross section photos.the cross sections illustrate the anomalies. the boards were designed to mil-275 (ipc 2221). material fr4 .093 smallest trace is .008 air gaps .005 12 layers vias are .025 pad / .010 hole / annular ring .0075 four of six parts look to have failed. ron > -----Original Message----- > From: Chalmer, Paul > Sent: Friday, June 11, 1999 2:44 PM > To: 'TechNet E-Mail Forum.' > Cc: [log in to unmask] > Subject: RE: [TN] from jpl > > They appear to be electron micrographs of board cross sections. There are > four of them, at about 120 - 160 KB each. I'll see if I can get more > information. > > Paul > > -----Original Message----- > From: Rob Watson [mailto:[log in to unmask]] > Sent: Friday, June 11, 1999 2:33 PM > To: [log in to unmask] > Subject: Re: [TN] from jpl > > > Can you describe in words what the pictures look like so that Mr. Flores > doesn't receive 1800 requests for > the pictures? That way only the people who know best about the problem > will answer. > > Thanks, > Rob > > > Chalmer, Paul wrote: > > > I received the following message from someone at NASA, who is trying to > > locate a manufacturing problem in some circuit boards. His message > included > > some pictures in jpg format, which are not compatible with the TechNet > > server. > > > > Please reply directly to Mr. Flores, who can forward copies of the jpg > > files. > > > > Thanks. > > > > Paul Chalmer > > Director, PWBRC > > http://www.pwbrc.org > > > > -----Original Message----- > > From: Ron Flores [mailto:[log in to unmask]] > > Sent: Friday, June 11, 1999 3:42 AM > > To: Chalmer, Paul > > Subject: from jpl > > > > hi, > > > > my name is ron flores. > > > > we have encountered a problem with a pcb. > > > > we have cross sectioned it and have come to a conclusion that it was a > mfg > > issue. > > > > enclosed find a few of the pictures taken. > > > > can you please evaluate them or direct them to someone who will and give > us > > you opinion? > > > > thanks, > > > > ron > > > > ################################################################ > > TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > > ################################################################ > > ################################################################ > TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################