Electronics Forum | Mon Jan 06 23:25:29 EST 2003 | Dreamsniper
I made an experiment with our semi-auto stencil printer and used my naked eye to decide whether the alignment and deposition is pass or fail. I based the results in percentage and 100% is perfect result. Now here's the question: Can anyone tell me w
Electronics Forum | Thu Dec 20 09:50:44 EST 2018 | stephendo
Once a long time ago I had a board where the cap beside a tantalum shifted in the oven. I phoned our HQ plant and was told that they had the same issue and that it was the tantalum capacitor outgassing. We just applied a dot of glue to the cap. Try b
Electronics Forum | Tue Dec 31 02:04:19 EST 2019 | sssamw
From the picture, I cannot see clearly solder ball violate electrical clearance or cause a short, maybe it is. What I can see is the solder paste has some misalignment although it doesn't printed in solder mask area, but actual position will reduce
Electronics Forum | Tue Dec 03 07:57:27 EST 2002 | pjc
Price of DEK 248 and MPM UP100 are about the same, $22-36K range. MPM UP100 has programmable squeegee pressure. Precise, repeatable results with less operator involvement. Pressure parameters saved in board program file. DEK 248 has manual microm
Electronics Forum | Wed Aug 16 13:52:24 EDT 2006 | russ
Oven settings are meaningless here. What does the board see? It is the paste we are concerned about not what the heaters are running at hehe. These solder balls are at the end of pad, which end? under the part or away from the part. I believe you
Electronics Forum | Thu Dec 07 13:51:59 EST 2006 | ganoi
I need advices as to how a gap between the bottom of an LED (1209-package) and the PCB can be controlled on a small rigid-flex PCBA? The problem that we experience is due to tight tolerance in the design of our molded housing in which this PCBA is as
Electronics Forum | Thu Dec 07 19:20:28 EST 2006 | ganoi
Most likely there is movement during reflow. How about conduction oven over convection oven for reflow? This is a small PCB with the LED sitting on a Flex-Rigid extension from the PCB. I was thinking if the stencil aperature for the LED was to be cu
Electronics Forum | Wed Aug 01 13:35:41 EDT 2018 | tey422
Need all your experts out there for tips & tricks to make things work. I been giving a task to help redesign a simple board; only to load two components. The challenge is to use pick-n-place machine to load the coil onto the 50up array panel. Previou
Electronics Forum | Sat Jun 12 00:34:00 EDT 2004 | kanwal324
Hi ! The main problem being faced currently is formation of solder balls - to be precise, these are micro solder beads generally found attached with bodies of SOTs, Chip Caps, Chip Resistors, between pins of SOICs (50 mil) - lying on PCB surface,
Electronics Forum | Wed Jun 27 21:24:47 EDT 2001 | davef
Welcome. First, proper alignment can produce an order-of-magnitude increase in the number of boards that can be printed without wiping. The initial alignment can be made either by: * Peering through the stencil apertures at the board underneath and
