Electronics Forum: two passes (Page 2 of 22)

Whitish Solder Joint

Electronics Forum | Fri Apr 04 17:43:52 EST 2003 | Kris

Hi, Did you use this paste before with out any problem or is it occuring for the first time ? If you wash only once a double sided board the side that passes through two reflow will have hardened flux which will may not be washed in your normal wa

no clean flux + wave soldering issue

Electronics Forum | Thu Aug 28 11:02:28 EDT 2008 | omid_juve

we have two similar pcb from two different pcb manufacturer one of them passed the wave soldering without any short circuit and residue and another one passed it with many residue . don`t you think that the type of solder mask from these two pcb manu

Immersion white tin wave soldering problem

Electronics Forum | Fri Dec 16 08:16:41 EST 2005 | davef

Heat cycles deplete the pure tin layer. Each solder cycle reduces the tin thickness by ~0.1 micron (4 uin). So, if you start with a thin imm tin coating you'll have problems after multiple heat cycles. Steve Wentz says, "In almost every case I've

Soldermask bubbles inmediately after screen printing

Electronics Forum | Sun Jul 26 07:52:35 EDT 2020 | sync40

Hello to everyone, Have you ever experienced soldermask bubbles inmediately after printed the soldermask itself? (for screen printing method of LPISM). I am not talking here about blistering or any outgassing defects after exposing to high temperatu

DEK HORIZON 265 Squeege Pressure question

Electronics Forum | Mon Nov 11 21:44:06 EST 2019 | kylehunter

> Knead pressure, is normally at or slightly lower > (maybe 25%) than print pressure... Ahh makes sense. Couple other quick questions if you don't mind: 1) Currently do kneading after 15 mins of no activity, with 3 knead passes, is that n

Accidental solder mask

Electronics Forum | Tue Dec 17 11:01:24 EST 2002 | Tim Marc

Hello all, One of our PCB manufacturers coated a through hole connecters vias with solder mask. The only IPC references that comes close to describing this problem is 2.9.2 Registration to holes, and subsequent specification 6.3.1 PTH � Vertical fil

Pcb immersion tin thickness

Electronics Forum | Wed Aug 09 08:06:07 EDT 2006 | davef

See "IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards" 3.2.1 Immersion Tin Thickness. The most common reason for solderability issues with the white tin surface coating during multiple thermal excursions is a thin white ti

BGA repair/rework

Electronics Forum | Sat Mar 06 10:25:55 EST 1999 | Earl Moon

I'm having a fun time between BGA rework/repair using an SRT 1000 and SPC efforts (much easier) using DEK stencil printing processes and BTU reflow with 6 Fuji lines in between. Concerning the BGA stuff, I'm getting about 60% success using this rewo

MyData Missing Placements

Electronics Forum | Fri Jul 13 16:52:24 EDT 2007 | jmelson

warning - not all stainless steels are non-magnetic! Quite a few alloys are magnetic, some as highly magnetic as ordinary steel. One quick test is to demagnetize the jaws. If you can find one of the old-style Weller soldering guns with the copper

SMT Line set-up - bare board??

Electronics Forum | Tue Apr 12 12:08:06 EDT 2005 | Dave G

I use the solder sample pcb that comes w/ each batch of boards. We ask our pcb vendor to send 1 pcb for solder testing w/ each batch. This is usually a pcb that is completely done it just didn't pass electrical test @ the final stage. I kill two bird


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