Electronics Forum: up (Page 146 of 1180)

kapton dots and liquid solder mask

Electronics Forum | Tue Aug 09 13:25:24 EDT 2005 | pr

From what I can gather, the annular rings are used for grounding when these boards are put in housings. A screw goes through the hole and is torqued down. If there is excess solder on the annular ring, the screw doesn't seat properly. The pallets cov

QFP Solder PROBLEM

Electronics Forum | Thu Aug 25 08:54:24 EDT 2005 | stepheniii

Could it be cold solder? Are there parts nearby that might be soaking up lots of heat, or maybe lots of internal grounding near that corner? Once I saw something similar except it was on two different assemblies. Each time it was on the side of the

REFLOW PROFILE NEED HELP

Electronics Forum | Wed Aug 24 11:34:03 EDT 2005 | dougs

if you don't scrap a board you'll struggle to get this right, i've seen it in other places i've worked where the management wouldn't let me scrap boards to test the profile and also wouldn't let us charge customers NRE for the cost of a board, needle

Component Loss in CP643

Electronics Forum | Thu Sep 29 05:37:56 EDT 2005 | dougs

for 0402's you should be able to run the turret at full speed, if you need to slow it down it means that your machine isn't set up properly. use the vision number that the manual tells you and make sure your feeders are properly calibrated, poorly c

BTU Paragon 150 Reflow Oven

Electronics Forum | Thu Apr 27 04:52:06 EDT 2006 | slaine

Ive a 5 zone vip 90, running at temperatures up to 280 degrees, biggest problem we have is with the fan moters siezing up. think we must have changed 8 out of 10 of them ok there 10 years old but it can be a lot of hastle. they sieze absolutly solid.

Scrap criteria

Electronics Forum | Wed Sep 21 04:50:10 EDT 2005 | Slaine

i set this up for one of nokias manufacturing plants and based it on the value of the board, caluclated the average rework times, worked out the costs of rework and costs of the board then for each type manufactured put a figure on the number of time

Seeking for help on MPM UP2040

Electronics Forum | Tue Oct 18 04:22:04 EDT 2005 | smtek_cc

Currently, I purchased a unit of Vintage 96, MPM UP2040, but it didn't come with any user manual, electronic diagram and part list. I have checked with the factory who sold this machine to me that they lost it sometime ago and don't have any copy.

How to set warm-up time of solder paste

Electronics Forum | Tue Feb 28 13:46:28 EST 2006 | slthomas

Assuming you're using DOM and shelf life to determine what's good and what's not, you just have to know 1)the rate at which you use it up, 2) how much shelf life is left, and 3) the rate that it goes bad when not refrigerated. From that you can tel

MPM AP25, separation problems

Electronics Forum | Wed Nov 02 13:24:09 EST 2005 | valuems

Hello Sorry we have not answered sooner, been gone. There is a height adjustment on the wiper. You will find a round nob under it, that is a height adjustment. I expect the wiper is not going all of the way up. And you can also control the speed

Universal Advantis

Electronics Forum | Fri Oct 28 10:03:13 EDT 2005 | rlackey

They don't index fast enough - On GSM's the original "black" feeders were replaced by "blue" feeders that indexed a lot quicker, that just about kept up with a flex head. There's no way one of those is going to index 8 or 9 times a second to keep


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