Electronics Forum | Tue Mar 09 20:08:08 EST 2004 | davef
Warping BGA are the usual cause of shorts in the corners and are usually caused by the reflow profile. BGA have a natural tendency to warp due to CTE and package thermal mismatch, as you have seen at rework. The PBGA will go from a bowl shape to an
Electronics Forum | Thu Mar 18 16:39:14 EST 2004 | Jed Johnson
A few good points have been made here: The profile could be ramping too fast. The profile could be gettting too hot. The profile may need to have more "soak" time before reflow to allow the board temperatue to equalize and the board to "relax" and st
Electronics Forum | Mon Mar 08 04:52:25 EST 2004 | martin
Hello i have some problem with our dynapert. Wonder if you could give me some advise. The problem is our machine worked not so well so we started to take out one by one of the cards and check all ic's so they was properly inserted. But when we ca
Electronics Forum | Mon Mar 08 17:34:10 EST 2004 | pdeuel
Differant machines have differant types of control. smoe use pulse motors with encoders and are controlled by PMD pulse motor drivers. Most of these will have parameters to determine things such as fast over shoot, speed for certian tools and varati
Electronics Forum | Mon Mar 08 15:17:50 EST 2004 | Robert
Need some suggestions on oven profile. I run a BTU VIP98 oven. Has 7 zones, convention heat and all. My profile goes (in Celcius) 150/160/170/180/205/215/180 moving at 28in/min. Roughly 5 minutes from start to finish. I use Kester 256 solder and my b
Electronics Forum | Tue Mar 09 09:31:49 EST 2004 | Robert
Yes, in fact I do have 3 T/C connectors but I've never known how to use them nor what to connect to them. I generally address problems by merely changing the recipe up or down depending on what I see on the board(s). Someone mentioned to use a MOLE b
Electronics Forum | Tue Mar 09 10:48:54 EST 2004 | cyber_wolf
I am not familiar with the VIP98, but I have worked with other BTU models for several years. As I have posted in earlier threads: there is absolutely no way to tell whether your profile is correct unless you attach thermo couples to your board and ru
Electronics Forum | Tue Mar 09 13:25:48 EST 2004 | vinhmach1
Hi Sr.Tech. I agree with you every bit but one. Isn't this a U.S. based site ? Then I would like to ask YOU Mr. Sr. Tech. What is http://www. stand for? My 5 years old daughter knows the ... for this evenly English is our Second Language. I am jus
Electronics Forum | Tue Mar 09 22:26:17 EST 2004 | davef
You should to be soldering to the nickel. The intermetallic is Ni3Sn4. "At relatively low temperatures, the tin-nickel layers form about as rapidly as the tin-copper layers do, but at higher temperatures their growth rate is distinctly lower. At 10
Electronics Forum | Fri Mar 19 12:09:17 EST 2004 | Primus
I'm just getting more involved with SMT, as I've been a through-hole operator for years. But I don't understand how one could reflow SMT components AFTER the through-hole insertion and solder wave are finished. How does one print paste over a board w
