Electronics Forum | Wed Mar 02 06:19:03 EST 2005 | pjc
Go to http://www.ipc.org and look up IPC-7351 - Generic Requirements for Surface Mount Land Pattern and Design Standard The successor to the IPC-SM-782A is here! The document covers land pattern design for all types of passive and active components
Electronics Forum | Mon Feb 28 11:31:08 EST 2005 | russ
This sounds a lot like a profile that is killing flux activity prior to wave immersion. What is your topside preheat temp just prior to hitting the wave? What type of preheat do you have, convection or radiant? Are you using a chip/turbulent wave
Electronics Forum | Mon Feb 28 13:13:25 EST 2005 | russ
ING, you had to nake it difficult didn't ya! It appears that all of your parameters are okay. When you state that "sometimes there is a residue" is it liquidous or dry? Is your spray fluxer an ultrasonic or a spray gun head? You may not be getting
Electronics Forum | Wed Mar 02 18:46:02 EST 2005 | Austinj
The tendancy always has been "when in doubt, touch it up"... this is not the way to "verify the process" and is not the best strategy for multiple reasons (unessecary rework, additional labor costs, as well as making the solder joint more brittle, [i
Electronics Forum | Thu Mar 03 09:04:26 EST 2005 | russ
Been following this thread and have a question, Why do "touch-up" people follow different criteria than "Q.C." people. It sounds like the root of the problem is not addressed but bandaids are being put into place. We have no "Q.C." department and
Electronics Forum | Wed Mar 02 09:06:44 EST 2005 | russ
We use 10% reductions when either the aspect or area ratio will not be affected. We will utilize a 1:1 when necessary. We place a lot of those little Rnets down to 0805 size .5mm pitch and do not see any problems. We use 6 mil stencils almost excl
Electronics Forum | Wed Mar 02 05:02:46 EST 2005 | prabhu_jude
Hello, We are using a film piezo electric sensor to deduct and measure vibrations. A long twisted pair shielded cable is used to connect the sensor to the signal conditioning unit (the signal conditioning unit has to be kept at a distance from the se
Electronics Forum | Wed Mar 02 05:06:15 EST 2005 | prabhu_jude
Hello, We are using a film piezo electric sensor to deduct and measure vibrations. A long twisted pair shielded cable is used to connect the sensor to the signal conditioning unit (the signal conditioning unit has to be kept at a distance from the se
Electronics Forum | Thu Mar 03 09:11:25 EST 2005 | russ
I wouldn't raise the temps just slow the conveyor, You need to get the PCB "soaked in". It seems as if you are applying more thermal energy than the PCB can accept in all areas. Does this oven have convection heating? Hopefully so. I have found t
Electronics Forum | Fri Mar 04 15:22:17 EST 2005 | russ
Glad to hear a little success from ya Duckmann! i have stenciled mask in the past and I can tell you that stencils are expensive. They are basically a step stencil, you will need full thickness for the area(s) you are going to apply mask and you wi
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