Electronics Forum | Mon Feb 21 20:15:49 EST 2022 | arminski
since IPC-J-STD-001 RevH obsoleted the 1.56ug/cm2 UCL of ionic contamination tester in testing using ROSE test, how do you define the acceptable limit per PCB assembly? thanks
Electronics Forum | Sun Nov 01 01:33:52 EST 2009 | isd_jwendell
Just my opinion: Top pic - Solder mask registration WAY too far off, without a doubt I would reject. Bottom pic - I would worry that there was/is a contamination that caused the poor looking mask. This may be cosmetic only, but unknown. I would rej
Electronics Forum | Fri Jul 30 09:43:44 EDT 1999 | C.K.
| We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. | The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is that after
Electronics Forum | Wed Oct 27 02:13:21 EDT 2004 | Joseph
Dear all, The problematic IC being X-rays and shown excellent wetting with no solder voids. Meanwhile the samples to be sent for independent party to verify the failure, e.g. using SAM method. The condition of failure is the PCB assembly fail functi
Electronics Forum | Tue Nov 24 19:07:12 EST 2009 | gregoryyork
I agree Patrick many people blame the assembly fluxes when it is some other hygroscopic chemistry left on the bare PCB such as surfactents from the HASL process these will do exactly what the guy reported in his post fail then cool down and pass ever
Electronics Forum | Sat Nov 26 05:55:04 EST 2005 | milroyperera
Hi, Does any body have the experience with wave soldering a "Gold" plated PCB with SMD assembled on it? I`m experiencing massive bridging,icicles,Shadowing & Skipping. The present soldering angle is 6 deg:,pre heating rate is 2 deg/sec , Dwell time
Electronics Forum | Thu Jan 28 15:08:32 EST 2010 | jamyboy
Hello All, Well we have a critical PCB assembly with 30 layers being produced by DDI. We just received word from the PCB shop that this unit only yielded 30% or basically 70% failed. Should we keep the 30% yield or have the shop rebuild al
Electronics Forum | Thu Mar 02 14:33:26 EST 2000 | Doug Philbrick
I have a customer wanting to hide the identity of a particular component on a PCB assembly. The product cannot be potted and since the PCB is the product he doesn't want to pour over that one chip for aesthetics reasons. Any ideas on ways to permanen
Electronics Forum | Thu Mar 02 14:33:26 EST 2000 | Doug Philbrick
I have a customer wanting to hide the identity of a particular component on a PCB assembly. The product cannot be potted and since the PCB is the product he doesn't want to pour over that one chip for aesthetics reasons. Any ideas on ways to permanen
Electronics Forum | Tue Oct 16 10:06:41 EDT 2018 | emeto
Hello experts, I have an assembly that goes through pretty tough sterilization on regular basis. Currently I am using a two component material in potting process. I was wondering if you can help me with material that can handle high temp and humidit
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