Electronics Forum | Thu Jan 28 15:43:16 EST 1999 | Dave F
| Hello Netters, | | I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that the LPI solde
Electronics Forum | Sat Jan 23 16:07:20 EST 1999 | Steve Gregory
| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier proces
Electronics Forum | Tue Oct 13 18:28:51 EDT 1998 | Graham Naisbitt
Upinder, Using IPA does not cause the residue, it simply exposes it. Given that all fluxes leave reisdues, it follows that these MUST be benign - but how do you know, and how do you control it. You are using flux to remove oxides and give you a go
Electronics Forum | Thu Oct 08 12:11:34 EDT 1998 | Rick Wyman
| Does anyone know of an AOI system that can look at the solder joints of SMT chip devices (1206,0805 & 0603) and make a reliable presence/abscence call of the joint on a HASL PCB. A low false call rate (much less than 1%)is required. Any info. fro
Electronics Forum | Wed Jun 24 11:59:31 EDT 1998 | Brian Conner
| What is your current solder pot temperature? Whatever that temperature is, | has it been verified/calibrated? | What kind of flux is being used? No-clean, OA, RMA? | How is the flux being applied to the PCB? | Is this problem occuring on ALL nega
Electronics Forum | Wed May 27 14:20:43 EDT 1998 | Earl Moon
| We recently made the switch to no-clean and the wurface mount is turning out beautifully. However, the wave solder process continues to put up a fight; we are getting a white residue on the surface of the PCB. The residue is not localized to
Electronics Forum | Fri May 08 16:30:59 EDT 1998 | Chrys
| I am running boards with gold fingers on a pallet for | masking purposes. The pallets worked fine for a while | but know the gold fingers are getting solder on them. We | have tried everythin: new pallets, cleaning the pallet | and board to be s
Electronics Forum | Sat Apr 25 19:40:01 EDT 1998 | Stan Traxler
| We have to mount our SMD devices 0.1 to 0.4 mm off the pcb | PCb substrate to compensate for thermal stressing in a | Space enviroment. Has any one any ideas or contacts for | dissolvable pads. this only applies to leadless components We have appl
Electronics Forum | Thu May 09 17:28:33 EDT 2002 | davef
There is no IPC specification, nor should there be. * There are just too many peculiarities in the design and fabrication of PWB. * The issue is not defining how to store boards. The issue setting expectation for reliable products and allowing you th
Electronics Forum | Thu Sep 11 15:23:31 EDT 2003 | Peter L.
I have come across a rash of failed assemblies that have 0805 capacitors and resistors, bottom side glued, wave soldered and washed. Trouble shooter reported touching up the solder joints on a few areas and the boards would pass test. I had a look a
