Electronics Forum | Mon Jun 05 14:09:36 EDT 2000 | Jason
We would like to gauge or precentage of production line failures to industry standard AQL level. What would be an acceptale AQL level for assembled pcb's or finished units leaving the factory?
Electronics Forum | Tue Mar 18 11:53:58 EDT 2014 | sara_pcb
Our contract manufacturing agency have procured pcbs from approved vendor. After assembly we found solder mask separated from the PCB on the epoxy area as patches. The top side is intact. also over the pcb tracks, the mask got damaged. In what c
Electronics Forum | Tue Mar 25 11:25:18 EDT 2014 | horchak
The first impression I get is that the mask was applied over dirty or contaminated copper. What is the trace and land finish on the PCB? You also appear to have a wetting problem.
Electronics Forum | Fri Aug 23 09:25:53 EDT 2002 | Dave Milk
Thanks for your help, Dave.
Electronics Forum | Mon Aug 26 20:29:10 EDT 2002 | davef
Sure, the 'Cheese It' Defense is an analog of the 'BIG GULP of Dew' Defense.
Electronics Forum | Tue Mar 25 09:35:28 EDT 2014 | emeto
Have you tried to bake the boards before you process them?
Electronics Forum | Tue Mar 25 10:31:05 EDT 2014 | sara_pcb
The boards are baked for 2 hours at 120 deg C Regards, R.Saravanan
Electronics Forum | Tue Mar 25 13:55:05 EDT 2014 | horchak
Ok lets put it this way. If the PCB house used a high quality mask and properly applied it to a properly cleaned surface and properly cured it, then as Dave stated above there are only two things that can destroy it. Excessive heat and overly aggress
Electronics Forum | Mon Aug 26 17:27:28 EDT 2002 | dragonslayr
first time I've heard of the Cheese Its defense to excuse any momentary lapse of reason. I think I'ma gonna order me a case of them nibbles right away. A guy can't be too careful now adays.
Electronics Forum | Fri Sep 06 13:45:02 EDT 2002 | Cris Campos
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