Electronics Forum | Mon Jan 26 11:46:16 EST 1998 | Rin Or
| I have a problem! The solder on my pc boards look great comeing out | of my reflow oven. They go thrue the rest of the prossese | and at the end at the qc station it's cold or whitish or gray not shiny. | does any one have a idea on how to correct
Electronics Forum | Tue Sep 26 11:05:44 EDT 2006 | slthomas
You might also have a dirty/sticky Z-rod resulting in the same problem, although ordinarily you'll see a lot of missed pickups as well.
Electronics Forum | Tue Jun 17 09:24:43 EDT 2008 | rgduval
Could it be from a dirty stencil, rather than from the pick and place operation? We've seen a number of occurences recently with solder balls near some of our fine pitch components...we eventually diagnosed as dirty stencils...excess solder on the b
Electronics Forum | Wed Aug 02 17:19:49 EDT 2006 | flipit
Yes 0402 8X4 embossed feeders exist for Panasonic MSR, Universal GSM, Contact Systems, and Mimot for sure. In the old days of 0402 components, 0402 resistors used to come in 8X4 paper tape but now I think most 0402 resistors and capacitors come in 8
Electronics Forum | Fri Dec 16 15:23:04 EST 2005 | Csabee
I think the Samsung SM320 is quite good machine..But I suggest that must assembly feeder cover to the feeder trolleys, because without that the tape feeders are not safe for the heads. Feeders should broke the head. chip components wrong light sett
Electronics Forum | Wed Nov 02 01:53:41 EST 2005 | pavel_murtishev
Hello, Thank you for answer. We are using second hand machine. What do you mean saying that �stencil is not height on all 4 corners�? Does it have some inclination between corners? I mean that three corners of stencil are matching with PCB fine and
Electronics Forum | Tue Jun 07 10:38:34 EDT 2011 | davef
Boots: Here's several methods for guessing at the amount of solder on your connection: * First, 'Down & Dirty' ** Assume that the solder is flat, which is reasonable since it's 'flattened' by the component package ** Assume 100% paste transfer from t
Electronics Forum | Thu Dec 11 19:32:11 EST 2003 | stefwitt
Let me guess, you are talking about a Siplace S15 or F3. The bearings around the sleeve could be dirty and create too much friction for the little turning motors to rotate the sleeve. What do you mean by parts missing? Are you saying components are
Electronics Forum | Mon Jul 24 08:30:25 EDT 2006 | nodlac
- Dirty stencil transfering paste from the stencil bottom. - Stencil opening (Pad Hole) to pad ratio incorrect - too large -misaligned stencil
Electronics Forum | Thu Aug 31 04:42:21 EDT 2023 | auriga2001
It could be the nozzles themselves causing the contamination. The coating could be worn off and oxidizing. Or it could be residue on the board or components that wasn't washed off.
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