Electronics Forum | Tue Sep 18 13:58:01 EDT 2001 | ert002
50%) only over the appertures where there was poor support. Most prints took 2 knead strokes to print OK, but this caused fine pitch leaded devices to almost short. stencil had to be be wiped after kneading. 2 similar devices with exactly the same
Electronics Forum | Tue Sep 25 13:01:48 EDT 2001 | Hussman
If the flux you are applying by brush is alcohol based, use some alcohol on a few failed PCBs and retest. It souldn't take a lot of flux to reflow the balls to a pad that's already covered with solder and flux from the first BGA - unless you are cle
Electronics Forum | Tue Sep 25 14:38:05 EDT 2001 | nwyatt
1. SRT has been recently calibrated - problem is too many hands in the machine and careless mistakes. The profile is good and has been recently checked by a fellow from Genrad. 2. We are relying on the left over solder from the previous joint and
Electronics Forum | Wed Sep 26 11:15:59 EDT 2001 | Hussman
What do you folks use for control on your wave solder process? Primarily after wave. I know there are a variety of "wave riders" that will assure proper wave solder parameters, but would like to know what down stream controls some are using. We ar
Electronics Forum | Wed Oct 10 13:49:12 EDT 2001 | stepheno
I recently started at a new company. They have a variety of bare PCB's and most have aprox. 20 variations. Maybe about 1/3 of each board on average are non-populated locations. They buy one stencil for each PCB but then use scotch tape to block of
Electronics Forum | Thu Oct 18 06:29:20 EDT 2001 | Yngwie
Dave, yes, your assumption is right, We only do washing after the second reflow. The timing from the post primary reflow to wash is no longer than 2 hour. The line config is as such : DEK265 � 3x MV2F- 1x MSF � BTU - AOI � DEK265 � 3x MV2F � 1x MSF-
Electronics Forum | Wed Oct 31 18:00:51 EST 2001 | Jonathan Mitchell
Hi All! In the near future we will begin to take on products that require a reflow process on both sides. We will run the backside first (smaller components) to reduce the chances of a part falling off during the second reflow, but my question is abo
Electronics Forum | Tue Nov 27 16:18:34 EST 2001 | MikeF
Can anyone give me a brand name on a chair with casters that only rolls when it has weight on it? A couple of jobs ago we had chairs for the operators that would only roll after someone had sat down, that way they would not roll away while someone wa
Electronics Forum | Tue Dec 18 18:14:16 EST 2001 | mparker
Years ago the FDA banned red dye # 2 because it too was found to cause cancer in lab rats. This was a good thing because the red dye was commonly used in a lot of food products as well as cosmetics. However, one case in point was baffling. It seems
Electronics Forum | Thu Dec 13 20:54:23 EST 2001 | davef
There is neither �nominal thickness� nor �is there a set maximum� for via masking. We use some of our vias as test pads. So, as you�d expect, we get rabid when we get mask bleed onto these pads. IPC-6012 - Qualification & Performance For Rigid Pri
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