Electronics Forum | Wed Sep 29 04:30:27 EDT 1999 | ROBERT
| | Hi All, | | Any one experince BGA-chipset warp about 10-15mil after removing | | from PCB? | | FYI, the rework temperature for preheat was 170C from room | | temperature about 30 seconds, & BGA was removed at temperature | | between 190-200C.
Electronics Forum | Mon Nov 28 09:46:24 EST 2005 | pjc
I have waved gold (ENIG) boards. That's a pretty hot pot at 260C, wow. I have used 245C with good results. All other parameters look OK a glance. Well, PCB temp looks a little hot too at 130C before pot. 90-100C is typical for most No-Clean flux. At
Electronics Forum | Fri Nov 08 14:19:59 EST 2019 | dwl
You can try putting titanium stiffeners on the PCB to prevent it from warping. How thick is your stencil? More paste would give you a wider window however too much and you risk bridging. You could try over printing the pad at the heel and toe to get
Electronics Forum | Tue Jul 12 17:53:02 EDT 2016 | muzzy
Hi! If You have manuals in PDF form, I would be very grateful if You could send them at: muzzybox(at)o2(dot)pl. Thanks. Regarding Your problem with 0603 resistors - I'm not an expert when it comes to using this machine, but I think there could be a
Electronics Forum | Fri Jul 22 16:42:50 EDT 2005 | campos
hello all, I�m experiencing problems with "warped" boards after first reflow, some of them i just can�t print side two due to this problem,,is it related only to reflow? i�m using a linear profile (225� peak / 70s time above) with a tin lead paste,t
Electronics Forum | Thu Oct 14 04:28:29 EDT 1999 | Grace Chua
Hi there, I have quite a number of problematic bd due to warpage problem. I would like to know the method on how to measure PCB warpage, thus to decide on the dispositon of these boards. Another question, can these warp bd be rework/fix. Is there
Electronics Forum | Mon Mar 16 04:50:53 EST 1998 | Grant Petty
We are going to try out a PCB manufacturer that has an Alpha Level for ensuring a flat finish on the PCB's. I am interested to know if anyone has and experiences, either good or bad on how boards treated with this process are to assemble. Is there a
Electronics Forum | Tue May 06 06:29:06 EDT 2003 | yukim
Hi, No, the layout is different, but both have chips located arallel and perpendicularly to the flow direction. And we do have defects in both orientation. What about the PCB warpage? Sometimes we find warped PCBs. Could this affect? Thanks, Yu.
Electronics Forum | Tue Jun 17 10:57:35 EDT 2003 | swagner
We had a product a couple of years ago that did the very same thing, we increased the amount of webbing to reduce the amount of warping.
Electronics Forum | Fri Jun 20 10:27:19 EDT 2003 | Cristiano Dick Smiderle
Hi We are experiencing serious problem with ceramic capacitors. They are with low electrical resistence and the problem is intermittent. We found some of them with micro cracks but not all. What could be the causes for this problem? We are su
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