TECHNET Archives

June 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:
Re: from jpl
From:
"Chalmer, Paul" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 11 Jun 1999 15:53:09 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (136 lines) 
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
################################################################

ATOM RSS1 RSS2