Have you approached your pcb vendor? However the chemistry which will remove cured resist is not very friendly.
I would assume the pads in question are just on the solder side. A PCB vendor could perhaps run the boards through a pumice or wire brush machine and then rework the solder side, re-resist and plate/hasl. Otherwise it is down to careful scrapping by hand. Depending whose fault it was push the vendor for a remake with a corrected resist layer. Chris From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Fred Townsend Sent: 15 January 2007 23:07 To: cb...@ntcnet.com Cc: emc-p...@ieee.org Subject: Re: Removing soldermask from pads I had the same problem except it was my surface mount pads on the QPSK64 packages. My solution was to scrap off the mask with a Xacto knife. I then retinned the pads to get rid of the bare copper exposed by scraping. In your case, and if I had a machine shop and tool and die maker available, I'd ask them to make a spot facing tool for each pad size. Then I'd use it by hand, in a pin vise, to remove the mask until I saw copper. Again, retin. It's slow but usually faster than ordering new boards. Fred Townsend DC to Light cb...@ntcnet.com wrote: >Good people of the group. > >Sorry to pirate your collective consciousness for a non-EMC topic; but >where else can I bounce this question off of hundreds of people? > >I have 10 prototype boards on hand that erroneously had soldermask put on >the pads for all of my through-hole parts (my surface mount pads are >fine). > >I've identified 41 through-holes that need the soldermask taken off of >their annular rings. The smallest are .060" pads with .043" holes drilled >through (about an 8.5mil annular ring), the largest are my mounting >locations that are .190" square pads with .125" holes drilled through. > >Has anybody found an effective way to get out of just such a jam? > >Thanks, > >Chris Maxwell, M.Sc >Design Engineer >Critical Imaging LLC >www.criticalimaging.net > >- >---------------------------------------------------------------- >This message is from the IEEE Product Safety Engineering Society >emc-pstc discussion list. Website: http://www.ieee-pses.org/ > >To post a message to the list, send your e-mail to emc-p...@ieee.org > >Instructions: http://listserv.ieee.org/request/user-guide.html > >List rules: http://www.ieee-pses.org/listrules.html > >For help, send mail to the list administrators: > > Scott Douglas emcp...@ptcnh.net > Mike Cantwell mcantw...@ieee.org > >For policy questions, send mail to: > > Jim Bacher: j.bac...@ieee.org > David Heald: emc-p...@daveheald.com > >All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > > > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message (including any attachments) may contain confidential information intended for a specific individual and purpose. If you are not the intended recipient, delete this message. If you are not the intended recipient, disclosing, copying, distributing, or taking any action based on this message is strictly prohibited. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
