Electronics Forum | Fri Dec 01 13:30:08 EST 2017 | kojotssss
Stencil thickness is 4 mil. Via's are plugging from bottom. Gas may be developed under the component? Take Reflow Ovens Thermal Profiling changes? In your opinion?
Electronics Forum | Fri Dec 01 14:11:24 EST 2017 | kojotssss
EMIL, The first stencil was with 4 squares. then there was a worse percentage. Changed to the circles. Is better, but still not perfect. Stencil thickness did not change. I added 2 types of stencil openings. Pictures of watch:
Electronics Forum | Fri Dec 01 14:50:30 EST 2017 | kojotssss
How about step down in the middle of thermo pad? I mean 0.075mm This can help?
Electronics Forum | Fri Dec 01 14:55:51 EST 2017 | kojotssss
Rework said that with hot air gun, heated the solder paste comes out of the middle part out to the side terminals and soldering extending beyond is perfect.
Electronics Forum | Fri Dec 01 15:22:46 EST 2017 | kojotssss
Recommended land and solder pattern says: VIA wall plating, via holes should be tented with solder mask on the backside and filled with solder. Solutions at this moment ? Thanks for all :)
Electronics Forum | Fri Jan 12 04:55:04 EST 2018 | smtspareparts
the attached instruction will be helpful for the sm feeder repairment,it is for old version feeder with control pcb,but the latest feeder has no inner pcb,so it's easier to repair. Bill http://www.smt-precise.com.cn
Electronics Forum | Thu Aug 30 16:27:05 EDT 2018 | emeto
You should request 100% Flying probe coverage - will cost you extra. If you have bigger quantities you could consider ICT fixture.
Electronics Forum | Thu Mar 14 17:58:20 EDT 2024 | mistrthou
We took an example to a local metal recycler. They wanted us to separate the outer aluminum from the inner stainless, then they scrapped them separately.
Electronics Forum | Sat Aug 22 12:18:12 EDT 1998 | Tryin'
| Board shops and us, the user, have a lot on our hands. As far as getting traces - this is done using an etch resist before solder mask and the HASL processes are performed. So when in the process is HASL performed?? | With tin/lead plated boards,
Electronics Forum | Sat Nov 05 07:17:25 EST 2005 | JeffP
That was the case with your oven but it is not so with ours. First, the distance from walls of the inner chamber to the product differs from one oven to another. Second, the dissipation of heat from metal heats up the air in the oven which in turn h
