Electronics Forum | Tue Apr 15 15:12:50 EDT 2014 | bradlevy
Thanks Bob. I just didn't have enough experience with production SMT (vs hand-soldered prototypes) to know how finicky some things like this are. I've tried to do a lot of reading, but I haven't seen much that talks about things like this. I also hav
Electronics Forum | Wed Jun 04 11:09:06 EDT 2014 | clydestrum
Ok, I have an issue that is somewhat uniform in it's recurrence in that it keeps showing up on the same location on the board. The problem area is a group of traces on the exposed side, that keeps having solder mask peel occur. As you can see in the
Electronics Forum | Wed Jun 11 11:33:26 EDT 2014 | fredcalkins
I do not have machine experience, but I think vacuum too early would be a more likely cause of chips leaping to a nozzle. Juki nozzles are made of hardened stainless and could be slightly magnetic, but the end is relatively small and would not have t
Electronics Forum | Sun Jun 22 13:24:49 EDT 2014 | davef
I don't know. We never had craziness like this before lead-free. You should have the yellowish-metal analyzed to be sure. Guessing: You're seeing this color on the terminations of components, not on the bulk of the SnX solder connection. If that's
Electronics Forum | Mon Oct 13 08:43:56 EDT 2014 | rob
Hi Larry, Picture a old lady with a set of knitting needles with leads attached to them, pressing the needles into different points of the PCB (pads, test points or component leads) and measuring resistance, inductance, waveforms etc between these p
Electronics Forum | Wed Nov 19 19:06:42 EST 2014 | spoiltforchoice
Plenty of people don't like cut 'n clinch and might appreciate just having the cut part. We do a mix of OEM and CEM work, because of the low volumes special tooling for a product is often out of the question so that is one thing to consider. We use t
Electronics Forum | Tue Jan 27 10:52:22 EST 2015 | dyoungquist
Taking a shot in the dark...... Are you using the correct oven profile for the connector? Solder tends to flow (wick) towards the hottest part of the connection/pin/pad it is on. It may be that the hottest part is the connector itself where the pi
Electronics Forum | Wed Mar 11 17:32:46 EDT 2015 | jlawson
Small paste deposits have less flux thus less flux activity to enhance the wetting. So preheat needs to be as short as possible, ramp to spike if possible. Try not to ramp hold and spike - pending thermal delta on product can be made to ramp to spike
Electronics Forum | Sat Mar 28 06:59:03 EDT 2015 | robertwillis
I would agree with the comments so far its much better to have some pre heat. You have not explained why bottom side preheat is a problem. Even having some input will help balance the process. Assume there is some thing on the back side that is a pro
Electronics Forum | Fri Sep 01 05:29:01 EDT 2017 | mona0312
Hi, Recently, i found a company called "jlcpcb". It’s very cheap 10pcs boards. 1.2mm thick, 1-OZ copper, 6/6-mil outer (0.1525mm) just cost $2 Cheap price and lots of options regarding board thickness, colour, etc. None of my boards have ever had a
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