Electronics Forum | Tue Apr 23 18:34:45 EDT 2002 | mkallen
My first posting was not very clear -- sorry. Let me try again. What I want to know is: can I eliminate the drying (baking) process completely IF I know that the good parts (i.e., those not being reworked) are going to stay under some threshold tem
Electronics Forum | Fri Feb 15 08:33:59 EST 2002 | fmonette
The joint IPC/JEDEC standard currently specifies a limit of one bake cycle, regardless of the temprature or duration. In the proposed revision this will be replaced by a maximum cumulative duration of 48 hours at 125C. The reason identified for thi
Electronics Forum | Tue May 28 17:33:31 EDT 2002 | wilcoxito
We are just getting started doing BGA assembly at our plant. Any helpful hints would be greatly appreciated. My first main question is about stencils. We are considering using diamond shaped holes for the BGA pads. Does anyone have any experience
Electronics Forum | Thu Jun 20 04:53:13 EDT 2002 | hany_khoga
Thanks Dave but unluckily my sweet BGA�s are surrounded by plastic connectors with hundreds of pins. Also my PCB�s are 4-layers so just thinking of doing what you suggest means ruining them for me. To be honest I tried bypassing the baking issue bef
Electronics Forum | Thu Jul 18 12:05:19 EDT 2002 | yngwie
Experts, Today I received PCB in a punctured vacuum seal bag. the Humidity indicator change the colour to pink at 60%RH mark. The brd finish is Entek. Earlier our intention to get the board vacuum seal is because we want to ensure that the is no fr
Electronics Forum | Fri Feb 28 01:10:32 EST 2003 | MA/NY DDave
Hi I don't know what FR4 you are using, so check it out to make sure 125 isn't too high. I have seen this done occassionally when the PCBs have bad moisture or other problemx where baking helps prior to assembly and solder, yet I haven't seen it do
Electronics Forum | Wed Mar 05 11:54:44 EST 2003 | ruggi
Hi JFB, I think this is an unnecessary activity, but it may depend on your RH. We are in the Spokane, WA area, and the RH avg year round is about 25-30%. We have never baked our PCBs in the 9 years I've been here across 800+ varieties, including
Electronics Forum | Wed Apr 09 09:48:49 EDT 2003 | iman
after oven bake dry the PCB, we process within 4-hrs, else need to rebake again under same baking parameter. taking a look, the exact pads with the blowholes are full ENIG pads with no via holes under the solder-intend land areas. In event there is
Electronics Forum | Tue Jul 06 07:49:08 EDT 2004 | davef
Q1)What is the MSD level for PCB? A1) There is none Q2)I have some PCB's with HIC (humidity indicator card ) has turn to pink at 50%. Should I bake the PCB prior to assembly process.This fab is a complex board with various kind advance package assem
Electronics Forum | Mon Jul 19 21:33:26 EDT 2004 | davef
Are you talking about small 'volcanos' that burst through PTH solder connections? If so, you have moisture outgassing through the PTH barrels: * Plating on the hole of your bare board is too thin. It should be greater than 1 thou [25um]. * Your bak
