Electronics Forum | Sun Sep 27 11:41:13 EDT 2009 | rajeshwara
We are using ST Demodulator QFP in our product which have exposed pad / heatsink from bottom side. Visually or in magnifier the solder joint or fillet looks good but if we touch up the pins with soldering guns , PCB works fine.
Electronics Forum | Fri Oct 30 08:24:12 EDT 2009 | rajeshwara
thnx davef & all With the help of all at last i solved the problem , The vias are not caped from bottom , so solder paste draining through the via to the floor which creates voids between IC ground pad and e-pad. Tnhx all again
Electronics Forum | Thu Oct 01 06:22:48 EDT 2009 | rajeshwara
We approved the Reflow Profile from Cookson Solder Paste Manufacturer we are using. Now I am suspecting on method of vias designing below that QFP.There is exposed pad for that QFP and we print solder paste there , but when i see under x-ray there is
Electronics Forum | Mon Sep 28 16:15:57 EDT 2009 | davef
That your solder connections reflow properly when heated with a soldering iron, indicates that that your reflow recipe needs improvement. * Thermocouple the pads that require touch-up and adjust your oven recipe to assure that they reach liquidous+20
Electronics Forum | Thu Oct 01 08:34:50 EDT 2009 | davef
First, the reflow thermal recipe provided by your paste supplier is only a ball park guess. Beyond that, the temperature measured by thermocouples on your oven heaters are only loosely related the temperature of solder paste on your board. You need t
Electronics Forum | Thu Dec 23 22:31:47 EST 1999 | Vincent Chen
Hi!Charlie, 1.Are you retrofitting your spray fluxer in your wave soldering machine? If you are, please ensure that you have a air knife just before the preheater!Fluxe fumes tends to accumulate and that could be dangerous if your air exhaust is not
Electronics Forum | Wed Nov 25 11:30:56 EST 2009 | rajeshwara
PRODUCT : SET TOP BOXES PROBLEM : Flash Programmed IC ( EEPROM ) Data Corruption. Description : Flash IC Data get corrupted during testing or manufacturing. What is the possibility ? Plz Help.
Electronics Forum | Tue Nov 17 22:36:17 EST 2009 | rajeshwara
Hi All Plz help , we are manufacturer of Set Top Boxes , where we use ST BGA 5202 ,Paste : ALPHA METAL OM338-T45-LF & STENCIL : 4 MIL & we also tried 5 mil . Problem : At first Test BGA work fine but after some days Assembly dead functional and when
Electronics Forum | Fri Jan 20 05:53:23 EST 2006 | dougs
i think it's more likely to be greasy/dirty shaft clutches, stand at the front of the machine and use the cam handle to turn the cam, while your doing this push up gently on the black top section of the shaft and try to turn the shaft, it shouldn't r
Electronics Forum | Mon Feb 12 08:37:04 EST 2018 | dontfeedphils
The piece that splits the vision probably has smudges or scratches on it. You're able to teach a set of pads. Before teaching the fid, hit the "Draw Correlation Box" button (I think that's what it's called, it's been a couple years). Then draw a b
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