Electronics Forum | Wed Apr 01 07:18:29 EDT 2020 | proceng1
We are using Superior 515 flux to clean and tin selective solder nozzles. Yesterday the flux turned a bright yellow (like a highlighter) when heated after the flux being applied. This does not happen with our Lead Free solder, only the Lead alloy.
Electronics Forum | Thu Jan 27 20:17:25 EST 2022 | stephendo
What exactly counts as "always on"? Our ROHS wave solder machine is always on during the week but the pot shuts off at the end of the shift and turns on early in the morning so that the solder is melted before we get to work. It is only using a small
Electronics Forum | Mon Dec 27 05:16:17 EST 2021 | jineshjpr
Hi Stephen, Thanks for your response. Since the OSP Finished PCB to be execute in mass volume, almost 3 to 4 weeks (Vacuum Sealed Pack) takes place prior to assemble. Although we are using SnPb 63-37 Type 4 solder paste for this single sided SMD asse
Electronics Forum | Thu Apr 14 15:27:05 EDT 2022 | ppcbs
If it was ROHS I would suspect copper migration. In my experience an acceptable copper finish should last up to at least 6 reflow cycles. If you have bubbles or blow holes in the solder joint, that is a sign of voids in the walls of the copper barre
Electronics Forum | Wed Jul 06 15:29:01 EDT 2022 | glasscake
Also I should mention, I've ditched the formulas for getting the "optimal" solder amount after being bit by them once. Now I just design a PCB with 4-10 spots for the connector then order a stencil with a range of aperture sizes. Figure out what give
Electronics Forum | Mon Apr 25 12:19:21 EDT 2005 | siverts
Hi all, We produced a RoHS (lead-free) prototype order recently, and there was some components that we needed to replace on a couple of PCBA's. We found it very hard to do this even with the new solder iron. The components was just small RoHS SOIC's
Electronics Forum | Wed Nov 09 07:31:41 EST 2005 | smtspecialist
The part I'm having problem with is a simple 0805 resistor 0R the inspection is done optical not mechanical and 75% of the rejects rate has the message: one or too many bad leads found. and the other 25% the messages will give a Background or Contras
Electronics Forum | Mon Jul 10 11:38:15 EDT 2006 | Rob
Hi Dougs, I think I'm going to have to admit to some insider knowledge here. It kind of gave it away when you mentioned there were only catalogue pages instead of specs. http://www.anglia.com/product_search/part_tracker/index.asp I think you may
Electronics Forum | Tue Oct 24 09:52:35 EDT 2006 | SWAG
We are having the exact same problem! We do about 6 or so ROHS SMT builds. 5 are fine now but we had problems with most initially and 1 is trouble still. All boards are same material, same PCB manufacturer. Initially, when the delam. problem occu
Electronics Forum | Mon Dec 08 17:06:59 EST 2008 | boardhouse
Hi MGL, Couple things to ask, have the boards recently been changed to Rohs builds? STD FR4 to High TD Laminate. Check the stack-up the board houses are using. Just about all Rohs laminate has Resin starvation issues when used in single ply co
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