Electronics Forum: alpha

MyDATA 12e Machine blowing fuses when powered

Electronics Forum | Tue Jun 07 19:04:07 EDT 2022 | proceng1

IF the two are identical, swap the suspected bad one (#2) position 1, and see if the fuse blows before connecting the second one. Basically the same test process you describe, but swap the units first. See if the problem follows the card, or stays

SMT process Blowhole/ Pinhole

Electronics Forum | Mon Apr 07 04:33:43 EDT 2003 | Neil

Iman, How long after washing the boards do you process them? Are there any vias or Micro vias on any of the pads you see the blow holes on? A possible cause of a blow hole in a solder fillet or PCB is the escaping of Moisture under extreme temps. Th

Difference Gold Plating electrolytic and ENIG with on BGA

Electronics Forum | Thu Apr 07 09:04:19 EDT 2011 | mosborne1

First of all you need a new board house. You should quote us http://www.americancircuits.com. This really looks like a poor drilling operation with the blow holes. Blow holes are usually caused by two main problems. Improper drilling and/or moisture.

Blow Holes voids in solder fillet on caps

Electronics Forum | Thu Jun 28 09:57:50 EDT 2012 | mosborne1

blow holes and via holes are almost always caused by moisture and in PTH they could be moisture and improper drilled holes. If you are seeing solder balls next to the parts than I would say you have a reflow profile problem. Are you using any kind of

Tin HASL finish soldering problems

Electronics Forum | Fri Sep 17 03:13:00 EDT 2010 | grahamcooper22

In HASL pcb coating you need to fully coat the pads with solder and then blow off any excess solder to leave a nice coating on each pad. Generally pcb manufacturers try to give you a flat pcb pad to make your solder paste printing more consistent. To

Gold Contacts

Electronics Forum | Wed Mar 21 16:32:03 EST 2001 | mparker

The root cause is dependant on the type of solder "splash", ball, whatever, that you are seeing post reflow. If it is smears, then cleaning the stencil underside is probably the answer. Are you using automatic wipers? How many print cycles between w

Printing Problem

Electronics Forum | Fri Nov 19 14:40:48 EST 2004 | glaucon

The R.H of 28-30% is too low! (What about ESD issues?). Have them check to see if the printer/print area has a "breeze blowing" accross it, they can disconnect fans inside if needed to limit airflow from drying the paste out.

Flipchip sticking to tape and reel covers

Electronics Forum | Mon Feb 21 03:56:34 EST 2005 | abhirami

Agree with Davef. Smaller the chip, more the static charge. I used to see this even with normal chips. Get an ionizer blow. It should solve your problem. May be switch to antistatic tape if affordable.Regards. GV

Solderality problems with SN100C Lead Free Hasl

Electronics Forum | Fri Sep 22 04:43:18 EDT 2006 | greg york

Interesting you should ask this what problems are you seeing. Non wetting and blow holes and shallow fillets at all??? Cheers Greg

BGA non wetting

Electronics Forum | Fri Sep 17 03:03:29 EDT 2010 | grahamcooper22

Hi Gani, looking at the HASL icture and the poor wetting of the solder over the pads I would imagine that the HASL coating is very thin on the pads and in actual fact isn't 'solder' but is tin /copper intemetallic and this has poor solderability. It

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