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 | Fri Oct 15 11:05:50 EDT 1999 | Mark Phinney
Earliar we had problems with board warpage, Much of our problem was due to imbalances in the copper on oppisite layers in brief on a 8 layer board the copper on layer 1 should = the copper on layer 8, 2=7, 3=6, 4 = 5. We added copper to some layers t
Electronics Forum | Thu Oct 14 23:01:48 EDT 1999 | Dennis O'Donnell
With loaded boards, warpage can be removed by placing the assembly in a wave solder conveyor pallet as you would if you were going to wave solder the assembly. Place board and fixture in a Blue M forced air oven at 90 C for 30 minutes. Let cool to r
Electronics Forum | Mon May 13 06:15:12 EDT 2019 | dhanish
how to control warpage on panelized pcb during reflow process.we are already running with pallet.Encountering problem to insert the pcb into pallet after first reflow cycle.The insertion is being done by robotic arm. Any recommendation on the profile
Electronics Forum | Mon May 13 23:44:26 EDT 2019 | dami0629
if use tray cannot solve the problem, you can change from the design 1）Reduce the effect of temperature on PCB 2) PCB USE HIGH TG 3) BOARD THICKNESS TOO THIN 4) MODIFY THE BOARD SIZE 5) Reduce the V-CUT depth.
Electronics Forum | Mon May 13 06:38:41 EDT 2019 | relaycz
You need to give us a little more information. 1. What is the size of your panel? 2. Are there any heavy components? 3. What is the thickness of your board panel? 4. What kind of oven are you using? 5. Is it only a recent problem or ongoing one?
Electronics Forum | Tue Dec 07 04:23:27 EST 2010 | Jacki
Dear All I hope I can get some advice of PCB experts in here.My problem is - after wave, our big board, 640x420x1.7mm, had a warpage when the board was cooled down after wave. PCB was flat while being warm.I had tried with many type of pallet and mad
Electronics Forum | Sat Dec 18 08:23:33 EST 2010 | remullis
I experienced warpage on a 7'x 13" long board, unfortunately my oven does not have center support. I use stiffeners on both of the short ends. It fixed my problem. Some of the things I was experiencing with the warpage on the second pass were placem
Electronics Forum | Wed Jan 13 19:13:59 EST 1999 | Michael Allen
Just a comment: we've seen PBGAs curl up at the corners, but only on prototype components that came off of a low-volume "prototype" line at our component supplier's lab (non-production overmold material was used). Production parts have not exhibite
Electronics Forum | Wed Jan 20 13:07:16 EST 1999 | Robert Noory
I have received prototype PBGA (256 pins) devices from Motorola (actual part number = KXPC850ZT50). These parts seemed very warped on the edges. When I put the part on a plain surface, it rocks quite a bit when I press lightly on a corner. I have
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