Electronics Forum | Fri Sep 12 08:01:55 EDT 2008 | davef
There is no standard. On the web, you can find shelf life estimates for various types of solderability protection on bare boards. These estimates won't translate directly to the storage of assembled boards, because assembled boards [and the solderabi
Electronics Forum | Thu Oct 23 23:38:48 EDT 2008 | pathakvj
We have 8 layer HASL PCB. We saw molten solder blobs / balls on op side of assembled PCB. (to check, if this was a bare board problem), We passed bare board as received thru, SMT reflow oven and saw solder balls on top side of board. What could be th
Electronics Forum | Mon Sep 17 05:48:10 EDT 2012 | stivais
Hi Ben, Yes, this could be the reason but have you ever seen solderability issues for (new) boards with LF-HAL surface finish? I have seen this only if there are surface finish quality issues for bare boards (exposed copper etc.). In this case we di
Electronics Forum | Mon Mar 12 08:00:14 EDT 2007 | rgduval
It sounds like you may be thinking of two different test methodologies. What is required? Bare-bard testing, to verify pcb fabrication? Or populated board testing, to verify manufacturing? If it's bare board testing, the fab house should advise a
Electronics Forum | Tue Jun 13 13:40:20 EDT 2006 | Bob R.
Wow, good luck. None of my test results would be helpful since we use IPC-B-24 test boards as received from our board suppliers so we have a clear understanding of what we're shipping customers, not necessarily paste performance alone. We'll only cl
Electronics Forum | Thu Dec 06 19:46:08 EST 2001 | davef
First, we�re assuming that we�re talking hot air solder leveled [HASL] bare boards, eh? Consider using A-600 - Acceptability of Printed Boards as the basis for discussing the bare board problems. It is the bare board analog of A-610 - Acceptability
Electronics Forum | Sun Sep 12 09:40:04 EDT 1999 | Wayne S.
hello having a problem with one customers bare boards not matching my stencil apertures. i design stencils based on gerber data and reduce up to 15% on some pads. do some board houses reduce pads after receiving gerber data???why would they do that
Electronics Forum | Thu Jun 17 17:26:56 EDT 1999 | wayne sanita
first of all what is the technical term for the small amount of solder on a plated pad. we are getting poor screen printing gasketing on a 20 mil qfp due to this solder not being even or too high in spots and not covering the length of the pads. any
Electronics Forum | Sat Oct 31 22:55:59 EST 1998 | Kallol Chakraborty
| Can anyone help me out? I am looking for any information on In-line automatic optical inspection systems for SMT (not Bare Board). Does anyone have any thoughts which equipment is ok? I have visited MVT & cyberoptics sites but i would like more det
Electronics Forum | Sun Nov 24 10:12:44 EST 2002 | kcorrin
Thanks for your response Dave. I did look at the bare boards after wave solder and they seem to solder fine in that process. I do not see any soldermask bleed on bare boards. Regarding "thin" plating...I have had issues in the past when the board sup
