Electronics Forum | Tue Oct 20 18:53:13 EDT 2009 | fdbittner
Having some issues with 56 contact TQFN. This is low-run prototype situation so no second chances - unfortunately. Part is 5mm X 11mm with .30X .63 perimeter lands and 2.5 X 8.5 thermal pad in center. Issues noted are intermittency at test (basica
Electronics Forum | Fri Nov 06 09:31:20 EST 2009 | adlsmt
Sounds like your contract assembler has some serious issues. You should not be getting defects anywhere neer that amount. If you do decide to go that route again find one with a good AOI machine at a minimum and you should also supply them with a fun
Electronics Forum | Wed Nov 04 07:39:34 EST 2009 | vetteboy86
We have started using an RGB LED and today ran the first boards down our line. I noticed an immediate issue with placing these. I'm using a quad QSP-2. The part sticks to the nozzle. The nozzles are clean. I have adjusted machine handling so that vac
Electronics Forum | Fri Dec 18 09:27:51 EST 2009 | sforman1
Tom: Once again - why are you using solvent based conformal coating. 1B31 is OK as a CC but it contains Toluene and MEK!! It is only 35% solids which means you are trying to get rid of 65% solvent. If you must use it due to customers requirement then
Electronics Forum | Wed Dec 23 09:11:56 EST 2009 | lynn_norman
In a former life, we used hi temp solder. I've heard of adhesive and taping methods, we just never used them. We too had a "golden" assembly that we would use for routine profiling. Our requirement was to attach a TC to the lowest thermal mass, hi
Electronics Forum | Tue Dec 15 12:23:47 EST 2009 | swag
I have moved golden boards from chains to mesh as I got tired of fishing t-couples under the chain rail. I saw a 3-5 deg. decrease on top-side parts peak temp. (all t-couples were on top side). I had to bump zones 6 and 7 a few degrees to make up f
Electronics Forum | Fri Jan 29 13:31:19 EST 2010 | phase1
We aquired this reflow oven some time ago and finally have the need for it. Anyone who knows how to set up this machine and train an individual would be greatly appreciated. We are located in the Rockville Maryland Area. Power is run to the machine,
Electronics Forum | Fri Feb 05 14:39:50 EST 2010 | gregcr
Hi All, We evaluated and approved KESTER R520A for our default RoHS solder paste a couple years back. It's time to re-evaluate to see if this material is still the best choice. Please let me know your opinion on the solder paste you are using, and
Electronics Forum | Wed Feb 10 21:41:54 EST 2010 | plaiming
We experiences some failures on PCB assemblies from the field when a methacrylate epoxy adhesive was used to secure some through-hole components to pcb board as reinforcement against vibration. During application, the epoxy covered some smaller SMT c
Electronics Forum | Fri Feb 26 14:36:58 EST 2010 | gregp
Hi Dave, The short answer is "it doesn't". The mascot is simply a light guided assembly system. The major difference is the CS-400E machine has the fully programmable cut and clinch unit doing it's thing under the board while it is being assembled.
