Electronics Forum | Wed Oct 04 14:18:05 EDT 2006 | C.K. the Flip
The main cause of voids is your flux out-gassing during reflow. Try a little "knee" or slight soak in your thermal profile to dry out the volatiles a bit. Typical soak ranges from 130 deg. C to 170 deg. C for around 30-90 seconds.
Electronics Forum | Sat Oct 21 03:02:02 EDT 2006 | aj
All, We had a power cut the today. Machine times out on Actuators and Paste Dispenser hence it will not Initialise fully. I have traced back each related card but all seem to check out fine. Next step is PSU (looks awkward to access) Any ideas fe
Electronics Forum | Mon Oct 30 09:43:31 EST 2006 | russ
Are your preheaters maxed out then? What is conveyor speed? anyway I would not have issue with that configuration at all. I have actually found that when using convection for some watersolubles you actually dry out flux and performance is worse.
Electronics Forum | Tue Nov 07 15:08:59 EST 2006 | russ
here are my thoughts on kester, I have rec'd a sample to qualify here and we cannot even get it out of the cartridge it is so dryed out. Rep informed me that Kester has a problem with its chemistry right now. Product is Mfgr'd in off shore location
Electronics Forum | Tue Nov 28 16:05:29 EST 2006 | Steve
Well said. From my experience, the Chinese would ship out of spec. product knowing full well it does not meet the requirement. If we catch it, good for us . . . otherwise we are #@%$%#. The Japanese (and others) on the other hand would rather pull
Electronics Forum | Fri Nov 24 06:59:54 EST 2006 | LM
I remember many moons ago seeing a refridgerator for storing solder paste which issued them out in a FIFO manner and had the option of a PC and bar code scanner for logging them in and out to the lines. I can't seem to find any trace of it on the net
Electronics Forum | Tue Dec 19 08:32:44 EST 2006 | davef
Take your choice: * Can't image this is a good thing. The board under the die will 'dry-out' and turn brittle over-time. It's possible the way attachment glue bonds to the board will change as the board dries-out. * Epoxy suppliers pad their number
Electronics Forum | Tue Jan 09 08:26:51 EST 2007 | stepheniii
If your boards are not totally rectangular part of the board can stick out past the stopper. If the fiducial is there then you can't use it. Also make sure you are not using panel fiducial co-ordinates and then expanding those out with panelization
Electronics Forum | Tue Jan 09 22:16:17 EST 2007 | guest
For chip components it is very hard to identify specially the capacitors. You could get sample of each chip manufacture and compare the color. This is very labor intensive task. I suggest to sort by value ( capacitance, resistance) than by manufac
Electronics Forum | Fri Jan 19 13:31:14 EST 2007 | lit51
Is the failure just out of tolerance or is it non functioning? For tolerance problem, compare the x-rays of the good and bad units. It will take a very high resolution x-ray to spot the differences. Changes in capacitance values can occur based on
