Electronics Forum | Sat Apr 25 07:10:01 EDT 1998 | JoSi
Hi, A collegue of mine, working on incoming inspection departement, asked me if I know any good standard,preferrable on CD-ROM with high-quality images of different defects that can be found on bare pcb`s. I know IPC-standards, but is there any
Electronics Forum | Sat Apr 25 09:13:26 EDT 1998 | Earl Moon
| Hi, | A collegue of mine, working on incoming inspection | departement, asked me if I know any good standard,preferrable | on CD-ROM with high-quality images of different defects | that can be found on bare pcb`s. | I know IPC-standards, but i
Electronics Forum | Mon Oct 27 14:15:47 EDT 2008 | hussman
So you passed a BARE board thru the oven and got solder balls?
Electronics Forum | Thu Jan 14 04:28:46 EST 2010 | gregoryyork
whats the solder finish on the bare boards
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 | Thu Oct 30 19:59:05 EDT 2008 | gregoryyork
solder ball was caused by hasl process not reflow. seen before many times, look around wells of smt on bare boards should be more of them
Electronics Forum | Mon Jun 14 11:44:23 EDT 2004 | Dreamsniper
I have boards with bad HASL application. First they're not even. Second some pad edges have no HASL and still remains bare copper. What's the maximum and minimum HASL thickness required for a good solderability. My boards are about 6 weeks old, I kno
Electronics Forum | Fri Oct 24 06:55:48 EDT 2008 | clampron
Good Morning WS, If you experieced the solder balls after reflow of a bare board through the oven, then the source of the solder is either the oven or the board. I have had boards with untented via's that were HASL'd that had entrapped solder and fl
Electronics Forum | Mon Nov 26 20:15:50 EST 2001 | davef
Sounds like you are thinking correctly. I'd guess your fab has gotten "smart" and changed your bare board, as you suggest. So, you've got two choices: 1 Rework the QFP. 2 Remove the lower temperature PTH components and solder them to the board some
Electronics Forum | Tue May 30 10:03:04 EDT 2006 | jbrower
Howdy Marc, Check with your flux vendor, they should have a data sheet with what you need. Baring a wave rider or other profiler, I use a laser thermometer (They're cheap.)and It gets me close to where I need to be on our assemblies. I usually chec
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