Electronics Forum | Mon May 22 09:35:07 EDT 2017 | emeto
There is one lead that is a total miss. I think you are too low with the wave there - you are barely touching the board. I would say first look at your wave height. If you have the possibility to change the angle of the wave(if there is a backplane t
Electronics Forum | Mon Jun 05 18:50:10 EDT 2017 | caurbach
Hi Zac, My 2 cents: We had similar problems on a board in the same situation (tin-lead HASL, very long leads, low pot height, high pump RPM). Trimming the leads shorter, moving the pot closer to the board, and dropping the pump speed down to sane
Electronics Forum | Tue May 23 02:32:33 EDT 2017 | bukas
hello Zac, if you are running pump at 100% and there is not enough wave then you will probably need to empty solder bath and clean everything. also check pump parts for tear and wear. eached solder inlet can make a lot of problems when it comes to w
Electronics Forum | Tue May 23 03:43:22 EDT 2017 | zsoden
Oh wow that is very useful insight! I will remove and check next time we fire up the machine! How did you know the factory size of the intake hole?
Electronics Forum | Tue Jun 06 19:03:59 EDT 2017 | zsoden
Hi Steve, I just confirmed with the manufacturer and the HASL is tin/lead (or it is supposed to be, at least). Any suggestions for how to test for nickel vs tin/lead? We're using an alcohol based no-clean flux from Alpha.
Electronics Forum | Thu Jun 08 17:35:48 EDT 2017 | zsoden
Thanks for the suggestion, Steve, I'll look into sourcing a test kit here in Oz! I did however talk to the guys doing the touch ups of this batch of boards and they are sceptical that it's nickel: they have had to solder to nickel in the past and rec
Electronics Forum | Thu Aug 03 17:53:58 EDT 2017 | zsoden
That may just be an optical illusion. I've just measured and they're cut to just over 4mm (0.157"). The pot is at the level specified by the manufacturer (5mm from the bottom of the PCB if I remember correctly).
Electronics Forum | Fri Aug 04 07:20:10 EDT 2017 | emeto
Zac, for the profile I mean both - if your machine temp profile is inside the process window of your flux. Trying other fluxes might give you some answers.
Electronics Forum | Wed Aug 09 09:29:09 EDT 2017 | edhare
I recommend examining the problem pads and a representative bare board using SEM/EDS to determine if the problem is related to a board solderability issue. I can support this type of analysis (www.semlab.com).
Electronics Forum | Wed Aug 09 20:06:35 EDT 2017 | zsoden
Thanks Ed. I'll keep that in mind but at this stage I'll rule out the other options such as flux and heat profile first...
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