Electronics Forum | Fri Aug 27 00:26:14 EDT 2004 | charly
hi, encounter few cases PCB was delam after reflow, and the supplier was refuse that this is a PCB manufacturing defect as the fallout is low within one lot. the cost for this scrap is high after PCBA level, my query here are 1) is there any way
Electronics Forum | Tue Nov 16 11:11:18 EST 2004 | iva
Hello Charlie, For Application of thermal conductive glue by dispensing, Luxeon recommends Amicon E3503 from Emerson and Cuming (www.emersoncuming.com) for its standard Luxeon Power Light Sources. For optimal thermal connection it is important that
Electronics Forum | Thu Dec 09 11:12:28 EST 2004 | msjohnston1
I was given the task of specifying our next AOI platform for our company. The new Orbotech Symbion P36 machine uses a laser and might have been my top pick, however the machine is so new I was not able to see a demo and the company was unable to run
Electronics Forum | Wed Dec 15 18:03:28 EST 2004 | russ
I have used both 4 and 5 mil stencils for 10 mil round apertures. We don't have volume measurement capability but we measure height and the 4 mil appeared to have more paste and better uniformity from a visual standpoint than the 5 mil. The unfortu
Electronics Forum | Mon Jan 10 11:08:39 EST 2005 | mrgman9999
We are having a problem with popcorning of a plastic BGA that has been under careful humidity control. We have had problems in the past and some have been related to too much trapped internal solvents from the die attach epoxy. We did a life time b
Electronics Forum | Wed Mar 02 09:06:44 EST 2005 | russ
We use 10% reductions when either the aspect or area ratio will not be affected. We will utilize a 1:1 when necessary. We place a lot of those little Rnets down to 0805 size .5mm pitch and do not see any problems. We use 6 mil stencils almost excl
Electronics Forum | Fri Mar 04 15:22:17 EST 2005 | russ
Glad to hear a little success from ya Duckmann! i have stenciled mask in the past and I can tell you that stencils are expensive. They are basically a step stencil, you will need full thickness for the area(s) you are going to apply mask and you wi
Electronics Forum | Thu Mar 17 10:56:24 EST 2005 | jmedernach
Hi John, This problem is interesting. I've never had a problem with solder shorts caused by subjecting a device to reflow a second time. I've built many double sided SMT assemblies with fine pitch devices on top and bottom. Some things to possibly
Electronics Forum | Mon Mar 21 07:25:12 EST 2005 | cyber_wolf
We have lab sink in our SMT area that we use for washing off stencils and hand tools that are contaminated with solder paste. The sink has a float in it and when the water level reaches a certain point it pumps the main basin out through a filter th
Electronics Forum | Wed Jul 13 14:50:29 EDT 2005 | rameshn
Dear Sir, We are manufacturing Computer Motherboards & Networking products (which are having 2 to 3 BGA Chips onboard) in our plant. we are having 2 nos of HELLER 1800W model Reflow Ovens. this model reflow oven is having 9 heating zones at both top
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