Electronics Forum | Wed Feb 07 13:43:33 EST 2007 | realchunks
Board vendors are always right. Unless you build yourself in their facility, at their price. Ways around this are half etch your stencil over the vias, open the resist (mask) on the vias, or use your own product (Sipad). The resist (mask) does app
Electronics Forum | Wed Feb 28 07:40:26 EST 2007 | realchunks
Hi Roderick, Guess it depends on how you define "minor". If it is just a visual blemish in the mask, there will be no affect o the BGA. If it is through the resist there may be a chance of solder shorting, which will affect it, I doubt it but poss
Electronics Forum | Wed Mar 14 21:57:58 EDT 2007 | Dave Jurena
We are setting up a facility in China and would like to verify the resistivity reading on our Westek wash machine. The only tool we have at this time is a multimeter. The machine reads .570 Mohms and the MM reads around .25 Mohms at a probe distance
Electronics Forum | Tue Feb 03 15:23:21 EST 2009 | gregoryyork
Hi George This is down to the different cure temperatures used during PCB process. No problem with the flux or your settings You should be seeing a waxy greasy oil like substance on the dirtier board. Or the resist has absorbed the flux residues not
Electronics Forum | Tue Nov 03 06:23:12 EST 2009 | josh_brubaker
Has anyone ever done a tape test to see if the solder resist pulls away from the PCB? Is this an acceptable method for testing solder resist acceptability? This is an issue I am experiencing with our PCBs. I am receiving boards with excess solder o
Electronics Forum | Mon Aug 29 22:48:09 EDT 2011 | davef
Rich Here's what Humiseal says: Thermal Properties The coating must be able to withstand localized thermal 'hot spots' generated by components. High temperatures can cause short-term changes in coating characteristics, such as softening and lowered e
Electronics Forum | Wed Dec 31 09:10:48 EST 2014 | rgduval
If you suspect a short, check the resistance on a new board that hasn't been powered up. The data sheet should give you the junction resistances that you're looking for. Double check against a component not assembled on the board. If you measure a
Electronics Forum | Wed Mar 11 18:28:03 EDT 2015 | gregoryyork
Hi its undercured solder resist which leaves a clear waxy/oily residue and can be seen as brown tar/oil in the molten solder wave. This also causes MicroSolder Balling and some snail trails of solder pick up and worst case bridging and peeling resist
Electronics Forum | Fri Aug 31 16:34:53 EDT 2018 | dontfeedphils
I'm putting together a spec for testing solder tips for resistance, voltage leakage, and temp tolerance. I've found solid numbers for both max acceptable resistance and voltage leakage, but nothing for max temp tolerance. Anyone have values they're
Electronics Forum | Tue Feb 08 23:25:10 EST 2022 | stephendo
You might want to look at a sequencer. It would be over kill but might work for you. If you trust the people to use the right resisters in the right places you could even program the entire kit of resisters. You would still have to cut to separate ea
