Electronics Forum: after (Page 472 of 696)

Re: Ionic chromotography test on PCBA

Electronics Forum | Sun Jun 07 19:09:21 EDT 1998 | Graham Naisbitt

Chiakl Ion Chromatography has been perfectly described by Dave, but here are a couple of extra considerations: Ion Chromatography will tell you precisely what is present on the surface of your board/assembly but it will not tell you whether it will b

Re: Solder masks for gold fingers

Electronics Forum | Thu Jun 04 11:09:50 EDT 1998 | Justin Medernach

| I have gold fingers that I want to mask when running over the wave without pallets. They're on the leading edge of the board. I recall seeing rubber boots that slid onto the fingers to mask them. Pop 'em on before the wave; pop' em off after and

Re: Solder masks for gold fingers/Try Rubber Shunts

Electronics Forum | Thu Jun 04 09:53:31 EDT 1998 | Dave F

| I have gold fingers that I want to mask when running over the wave without pallets. They're on the leading edge of the board. I recall seeing rubber boots that slid onto the fingers to mask them. Pop 'em on before the wave; pop' em off after and

Providing Thermal Relief On Vias

Electronics Forum | Wed Jun 03 13:51:57 EDT 1998 | Dave F

Hello: BACKGROUD: SMT components soldered on the top-side of boards that also require wave soldering have the potential to reflow during wave soldering. Reflowing these components during wave soldering is not good. It can cause cold joints, opens

Re: Vertically Mounting of a PWA to a PWA

Electronics Forum | Thu Jun 11 09:34:11 EDT 1998 | Mike Moninger

I'm surprised there hasn't been a response to this. This technique has been around for some time, as it was used early on for memory boards and the like. The pins come on a reel with a carrier strip or strips. Machines are available from the manufact

Re: Minimizing Board Warpage During Reflow

Electronics Forum | Thu Jun 11 23:35:40 EDT 1998 | Scott McKee

| Does anybody know if a contraption exists that will minimize a PCB's tendency to become slightly bent after reflow? We have a new product that we're planning to assemble in a couple of months. The board is 9.7" by 13.4" and it is imperitive that

Re: Surface Mount Solder Balling

Electronics Forum | Fri May 29 14:35:05 EDT 1998 | Steve Gregory

| We are getting solder balls after reflow of surface mount components. We are using a no-clean paste and a new jar seemed to help for a little bit. Any ideas? Thanks in advance Hello Ryan, There's a quite a few things that can cause solder bal

Re: Component Baking

Electronics Forum | Fri May 22 11:12:25 EDT 1998 | Mike Glenn

| | Does anyone know about low pressure/low temperature | | ovens used for baking of moisture senstive | | components? | | Thanks | I need to know from where your need came. I usually just bake in conventional ovens with specified times and tempera

Re: DI Water Tarnish On Metal Parts

Electronics Forum | Wed May 20 20:16:29 EDT 1998 | D. Lange

| We notice that DI water seems to tarnish or discolor the metal packaging on crystals and DIN connectors. Our marketing types like the shiney metal surfaces. We don't want to hand solder these parts after washing. | Any suggestions? | Dave F Dave,

Re: Need to spec in smt prototype equipment

Electronics Forum | Tue Jun 23 11:08:42 EDT 1998 | Russ Miculich

| Any ideas on what to buy? Only need to build surface mount protos, ability to rework. Is a rework station okay? | Will subcontract production after design is proven. Best bet is to get an Elite or OK Industries manual printer if you are not doing


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