Electronics Forum | Thu Sep 20 07:18:42 EDT 2018 | proceng1
Has anyone else been experiencing this lately? We have had a rash of boards that come in properly vacuum sealed. We store them in the hot room until we are ready to build, and we get bubbles under the solder mask. We've had 4 different jobs, all di
Electronics Forum | Wed Jan 12 10:05:20 EST 2005 | Dreamsniper
we are using polyimide boards 6 inches x 7 inches, 2.5mm thick, 12 to 14 layers, for aerospace industries. I am using a long bake of 12 hours at 70'C prior to manufacturing or exposure to elevated reflow and wave soldering temperature. If schedule i
Electronics Forum | Sat Jan 08 08:50:35 EST 2005 | davef
Normally, you should not have to bake boards that are properly packaged and stored. Since you are seeing problems, baking makes sense. Consider 125C for 4 to 6 hours. Additionally, look here for more, while waiting for others: http://www.smtnet.
Electronics Forum | Fri Jan 07 07:36:14 EST 2005 | dansmall
I have a Polyimide board that is showing signs of de-lamination. I was wondering what pre-bake times and temperatures other people would recomend for new boards as well for boards that have been on the shelf for 8 months.
Electronics Forum | Wed Sep 14 23:30:30 EDT 2016 | ariss_t
Hi, my 2cent.. u could try to check the sensibility of the camera board stop sensor.. maybe it detect something i.e support block.. do reply when u found the actual root cause.. thanks..
Electronics Forum | Tue Sep 13 07:00:28 EDT 2016 | awhite
Thanks for the reply. When you hit start on the printer, you can see it send the "start cycle (SMEMA)" signal, and it immediately goes to "awaiting board from upstream." This tells me that the printer knows a signal has definitely been sent and rece
Electronics Forum | Mon Mar 26 16:58:53 EDT 2018 | solderingpro
Is there anything stopping you from replacing the flat belt solution to a continuous running steel roller chain conveyor? - From there (depending upon board temperature) you should be able to buffer your boards in a vertical buffer station if neede
Electronics Forum | Mon Sep 12 09:26:00 EDT 2016 | awhite
Our MPM Up2000 HIE is having a communication problem with any upstream machine we place in front of it...i.e. conveyor, board loader, etc. It all started when we removed a conveyor from inbetween it and a board loader, and hooked those machines up di
Electronics Forum | Fri Sep 24 12:02:57 EDT 2004 | Frank
Yes, I can see your problem, the nozzle makes only good contact in the center and so the ends don't make good contact. The ends tend to curl up during reflow. There were two suggestions to solve this. 1) Let the operator push down the labels befor
Electronics Forum | Fri Jul 15 13:28:55 EDT 2005 | Brian
A process consists of much more than just thee machine. When developing a cause and effect diagram ffor the process, there are many parameters that fall outside the machine itself. There are Man, Machine, Methods, and Materials. Just monitoring th
