Electronics Forum: mushroom (Page 1 of 2)

Re: small metallic bridging

Electronics Forum | Mon Dec 06 09:28:11 EST 1999 | Dave F

Glen: So that's this metal? Is it in the area of PTH or SMT solder connections? Etc, Etc. Assuming its near connections where pasted is reflowed ... Reflow defects, bridging: misplaced components, high placement force mushrooms paste, too much p

Solder Balls-No Clean Paste

Electronics Forum | Tue Aug 17 14:34:27 EDT 2010 | davef

Comments are: * Too much paste ... reduce it more. * Do not let a traces run between small discrete pads or the heat of reflow will pull a ball to the trace, we can repeat this. * Change the placement height on chip parts to reduce solder spread / mu

Wicking-solder found under mask

Electronics Forum | Fri Jul 13 01:34:13 EDT 2001 | dlkearns1

Quick update on my issue of " wicking ". I had some talk with the company QA guy. Told him I saw no wicking on the test panels at 30X. The next day he came up to me and said, he kinda saw a little something at 60X then verified that at 100X, So, he

Solder bridging on IC leads

Electronics Forum | Mon Aug 23 14:09:56 EDT 2010 | davef

Similar to Coop's comments, above ... Bridging: * Mis-placement: misplaced components, high placement force mushrooms paste * Too much paste: HASL thickness, lead finish, poor underside support, poor underside wipe frequency, printing with too lar

estop error wont go away on vitronics delta max

Electronics Forum | Thu Jun 28 18:50:08 EDT 2018 | caurbach

We don't have your exact machine or know your exact configuration, but our machine has occasionally gotten an estop due to a breaker in the SelectX tripping. Just be aware that there are circuits other than the mushroom switches that can generate an

Rework of thru hole components

Electronics Forum | Tue Dec 27 10:57:20 EST 2005 | DannyJ

I'm not sure if I understand the question correctly... Mainly, drill the mushroomed end of the rivet with a drill bit that is slightly larger than the shaft size of the rivet and remove the cover. Then, you should have easy access to what you need t

ENIG or flash?

Electronics Forum | Tue Nov 28 17:23:03 EST 2006 | flipit

Flash gold usually refers to electrolytic gold with a short plating time. In other words gold plating that requires current to plate. If you have bare copper under your soldermask, the gold is probably ENIG. The only other way to have bare copper

Re: Solder Paste Vs Solder Paste Cartridges

Electronics Forum | Mon Feb 22 14:30:55 EST 1999 | Steve Gregory

Hi Bill! Justin hit the nail on the head with his advice. One other thing I'd add too is that if your volume and such points to using cartridges, I found that sometimes operators can get a little wasteful. I worked for a memory company where we

Solder ball crack

Electronics Forum | Mon May 10 16:37:01 EDT 2004 | davef

First some definitions, the two main types for solder masking near BGA pads are: 1 Pad, Non-Solder Mask Defined. In circuit board design, pads with spacing that does not allow solder (usually bumps) on the pads to contact the adjacent solder mask. [

Solder Bridging on Nexlev Connector

Electronics Forum | Tue May 09 22:57:58 EDT 2006 | davef

The NexLev connector is built in a stripline construction, providing a continuous ground plane for each signal contact. The connectors come as tenrow connectors with 100, 200, or 300 positions at possible stacking heights from 10 mm to 30 mm. Technic

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