Electronics Forum | Thu Sep 17 10:30:22 EDT 1998 | Justin Medernach
| I need an evaluation process to prove to a customer that our no-clean process does not leave excessive residue? Any ideas? Wayne, Find out your customer's concern about the residue. Residue can be a pretty ambiguous term. Is their concern activi
Electronics Forum | Mon Aug 17 02:45:18 EDT 1998 | Bob Willis
| 5 micrograms per sq. cm. is actually not too clean. The maximum military allowed post-clean, on-board contamination is 5.7 micrograms of NaCl /cm squared (when using the Zero-Ion brand ionic contamination tester). | We are use to seeing cleanlines
Electronics Forum | Wed Jun 10 21:58:20 EDT 1998 | Dave F
We use them, but we never thought about them. WHAT ARE THEY? The hand lotion we provide for our operators. BACKGROUND: Operators hands take a beating. They 1 Work in a humidity controlled 35 to 50%RH environment that is drying 2 Wash before and
Electronics Forum | Sun Apr 05 18:36:41 EDT 1998 | Graham Naisbitt
Sylvia, I believe you will find that contrary to Scott Cooks submission, that the work carried out by Robert Clark of Hughes Missile Systems at (then) Tuscon Arizona formed the basis of the MIL-F-14256 spec which "Qualified?" or at least "Approved" O
Electronics Forum | Tue May 14 08:04:58 EDT 2002 | robbied
Hi. Does anyone out there know of a way to calculate the surface area of populated PCB's? We build many different types, and until now have been using a water displacement method, which I believe to be fundamentally flawed. Our technique is to drop a
Electronics Forum | Tue Aug 27 13:52:24 EDT 2002 | Mike Konrad
MK, In most cases, if the machine is completely closed-looped (prewash, wash, prerinse, rinse, final rinse etc), then the water should not require changing. As with most inline cleaners, there should be a considerable amount of water loss in the cl
Electronics Forum | Tue Sep 03 17:48:34 EDT 2002 | dphilbrick
My customer is finding a blue haze on some SMT pads after processing, kind of looks like a water spot on the surface of solder joints. It requires 20x mag and very good lighting to see. We have done 2 different ionic tests and the boards pass to clas
Electronics Forum | Thu Sep 19 02:45:33 EDT 2002 | bugsjoe
Thank you ur reply Dave. Let me explain our COB workflow: 1. unpack PCB (FR4,LPI,HASL)(the thickness of gold and nickel we can't be find)(No SMT before) 2. clean the pcb by rubber 3. blow the pcb by di-ionic gun 4. attach die by adhesive gel 5. cure
Electronics Forum | Wed Nov 13 04:36:46 EST 2002 | iman
does anyone know what environment factors(specifications?) and process control parameters(printer & reflow?) are optimal for running SMT using type 4 and type 5 solder paste respectively? Any pitfalls to avoid? The product we have been asked to use
Electronics Forum | Wed May 12 10:15:29 EDT 2004 | gabriele
Hi Dave, I've got it, many thanks. Snow ? My village is located latitude GMT + 1 hour,and about 45� north longitude. 30 Km north the mountains are still fully covered by snow. Sea is about 3 hrs driving down. My Job?, EMS'engineer (ex)
