Electronics Forum | Tue Mar 04 00:55:12 EST 2003 | nifhail
In the double sided SMT process assembly, normally the bottom side will be processed first, due to it's lesser density as well as it's lesser heavy components. Apart from worrying about the component falling down, what are the potential problems that
Electronics Forum | Tue Mar 04 18:38:12 EST 2003 | ruggi
Most of what we do (across 800+ varieties) is bottom side first. In general, there really aren't any problems as long as our Customers follow the .25g/cm wetted lead perimeter spec for weight (which many don't), and don't mount tall components on th
Electronics Forum | Wed Jul 14 19:23:21 EDT 2010 | davef
So, tell us more ... * Is this at in-bound inspection? Where do you observe this? * Does this affect the whole component, just terminations, ... * Could the 'brownish' be interpreted to be 'purplish'? * How wide-spread is this [eg, multiple products
Electronics Forum | Mon Nov 12 19:44:53 EST 2001 | ianchan
Am abit confused here, so suggestion is not to manual rework solder the 0201, and rather to cut em' out, with the cut shear applied at the end-terminals? elaborate pls? thanks
Electronics Forum | Sat Nov 09 08:04:52 EST 2002 | erhard
if you wave solder you have to glue the SMD parts on the bottom side. If you reflow the bottom side then you usually shouln't go over the wave afterwards. It's quite logical the joints melt again, that's what you want to achieve going over the wave.
Electronics Forum | Tue Jul 20 14:58:01 EDT 2010 | vetteboy86
So, tell us more ... * Is this at in-bound > inspection? Where do you observe this? * Does > this affect the whole component, just > terminations, ... * Could the 'brownish' be > interpreted to be 'purplish'? * How wide-spread > is this [eg, mu
Electronics Forum | Mon Nov 12 16:11:59 EST 2001 | davef
Listen. Reworking 0201 is too expensive. Here�s watt yado � * Cut the lil� suka between the pads on the board using side cutters. * Flick each piece from its pad, after melting the solder with a standard soldering iron. * Solder the terminations
Electronics Forum | Tue Dec 14 14:26:20 EST 1999 | John Thorup
Sure KA, it's done every day. Be sure that the components to be used on the bottom can take the maximum heat of the wave and the delta T of entering the wave. Depending how complex the bottom side is you will get better results with attention paid
Electronics Forum | Sat Nov 09 15:13:06 EST 2002 | mjabure
If I understand what you're saying, you are reaching reflow temp's on the top side while soldering bottom side components. You might want to run a glass gauge plate over the wave and make sure your contact pattern isn't too large. If your PCB is in c
Electronics Forum | Mon Jan 07 13:09:35 EST 2008 | stevek
As I told you, some carriers (trays) are limited > to 75 degree maximum, and from time to time > employees do not pay attention to this. This is > one of the reasons. The second reason is that 90 > degree still be problematic in a case of rebake
