Electronics Forum | Sun Apr 25 10:28:46 EDT 1999 | Joe Cameron
Hello all, Been doing some comparisons on joints made using the soldering iron versus reflowed solder paste (on a QFP package). The difference is quite significant: the joints made by the soldering iron are inconsistent and in many cases not filled
Electronics Forum | Thu Apr 22 14:36:33 EDT 1999 | Dave F
| On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although when
Electronics Forum | Thu Apr 22 18:07:38 EDT 1999 | Tom B.
| On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although when
Electronics Forum | Mon Apr 19 14:38:01 EDT 1999 | Chrys Shea
25 PPM)! | | 1. Is there a better process to solder the leads of QFP's with lifted "minute" lifted leads still having a realiable solder joints? | | 2. Or has anybody tried modifying solder pads and use thicker solder paste deposit to compensate fo
Electronics Forum | Wed Apr 14 20:39:02 EDT 1999 | Dave F
| I need to cure conformal coat on a 19" x 15" board. The material needs 7 - 10 minutes at 100deg C, but I have limited floorspace so I'm looking for an oven with about 36 inches heated length and 18 or more inch wide belt. The material we are consid
Electronics Forum | Sat Apr 17 11:56:04 EDT 1999 | Graham Naisbitt
Mike First, you MUST make sure the oven used is extracted. The coating will contain TDI. This is not nice. You would be better considering a silicone solventless. Try contacting HumiSeal. They had a material on the TAC line at Nepcon West that lo
Electronics Forum | Tue Apr 06 09:50:58 EDT 1999 | Justin Medernach
| Does anybody put QFP's on the backsides of boards? Can they be reflowed without falling off? Do you use adhesive? | I use a double sided reflow process all day, everyday. I've hung QFP240s with embedded heat sinks and they don't fall off. Yei
Electronics Forum | Wed Mar 24 09:22:16 EST 1999 | justin medernach
| We might be doing a job with some plcc, soic on one side and the other side will have two BGA's. Does any one have any ideas on what knid of problems that might occur if we reflowed both sides? Like heat temp, surface tension, etc. Thanks for any h
Electronics Forum | Mon Mar 08 09:53:08 EST 1999 | Steve Gregory
> Alignment issues are not so critical on most any system, but thermal >>(top and bottom heater settings) certainly are. Without a serious >>system, I just don't see how it can be done. Thanks again Earl for your valuable communications.. You're
Electronics Forum | Mon Mar 01 11:03:51 EST 1999 | Dennis Xiong
Hello! SMT professionals, I do not know if anyone posted this question before. Last week, I reflowed our newly designed thin Rigid-Flex pcb with 0.040" thickness. I found all of pins of a TQFP48 ic did not get wetted. I could see on the heel side o
