Electronics Forum | Thu Oct 14 06:27:45 EDT 2004 | davef
a disturbed solder joint. * Extended/slow cool down ramps can result in surface texture => grainy solder joint. Second, the "BGA scaling" could be a reflection of: * Too little heat (incomplete solidification) OR * Too much heat (excess grain growt
Electronics Forum | Thu Oct 21 02:07:06 EDT 2004 | darby
Reprint Services are excellent - even if you did not buy the machine from them. I have had two 100VP machines for 8 years and always go to these guys when I am in trouble. I've never met them and they have never met me but they treat every query with
Electronics Forum | Thu Oct 14 17:14:39 EDT 2004 | mattkehoe
We are experiencing a problem with soldermask defined BGA pads not accepting solder during the reflow process. The paste is there when the boards come off the printer but after reflow, no paste. Some other pads in the same pattern are fine. Here is t
Electronics Forum | Fri Oct 15 09:11:39 EDT 2004 | mattkehoe
Hi Justin, Thanks for the feedback. We are inspecting with the naked eye. Most of what we do are prototype quantities, in this case 6 pcs, so AOI or measurement equipment has never seemed justified. The release looked uniform during the printing a
Electronics Forum | Fri Oct 15 17:11:45 EDT 2004 | HOSS
Matt, Had a similar problem with HASL that wasn't fluxed properly during fab. The appearance of the HASL looked dull and/or mottled (sp?). Solder was curled under on the edges where it should have been smoothly joined to the pad. Almost like a pu
Electronics Forum | Tue Oct 19 09:26:51 EDT 2004 | HOSS
Arman, We introduced wireless wrist straps here on a small scale for safety related jobs such as mass lead trimming. These straps operate by the "Corona" effect which, as it turns out amounts to this: You need to drink a case of that swill to conv
Electronics Forum | Mon Oct 18 12:02:06 EDT 2004 | Rob
Hi Guy's, Sorry about this, but yes it's another lead free related question. We are looking at using a Chinese SMD DC-DC Converter in a new design, whilst keeping one eye on the approaching Lead-free issue. The manufacturer claims that these are O
Electronics Forum | Wed Oct 20 15:58:09 EDT 2004 | chezm
Hi, I am looking for someone to repair my Universal Digitizer/Programmer model 6892. I can not get the "@" sign after loading the GEN.exe to UIC and also the X,Y display, over the digitizing table is blank. I think, there is a hardware issue. An
Electronics Forum | Fri Nov 05 17:29:53 EST 2004 | Steve Stach
Most metal stencils today are cleaned with a water based cleaning solution. 3 choices are most typical: (1) Water only for water-soluble paste (2) Water + Organic for rosin and no-clean (low residues. This affords lower temperatures and is easier t
Electronics Forum | Thu Oct 21 13:31:41 EDT 2004 | LarryL
With the current failures of the Medium Power Linear Amplifier manufactured by RFMD (PN: RF2114), can anyone recommend a replacement part. The above part is used in a GPS transmitter, where I only have one recommended part on the part list. The manu
