Electronics Forum: pass (Page 70 of 142)

Solder balls on Ceramic

Electronics Forum | Fri Mar 25 10:50:01 EDT 2011 | grahamcooper22

3 deg / sec) then the flux can slump from the paste and solder is carried with it off the pad and will form balls. Finally, are your pcbs dry ? Pass a bare one through the reflow oven before you print any paste on it, let it cool and then process as

Solder beading with PCB from different fab

Electronics Forum | Fri Apr 01 02:56:18 EDT 2011 | grahamcooper22

the cause could be moisture in your pcbs. To check it...pass some bare pcbs through your reflow oven (this is a simple way of drying them out a bit), then paste and place and reflow as normal....if solder beads disappear then the pcbs have too much m

DPAK drop @Second reflow

Electronics Forum | Tue May 31 22:40:24 EDT 2011 | bejrananda

HI All, Please kindly advice me, I have project that it has DPAK part (MPN:SUD25N15-52 E3 Plating:100% Sn matte)which locate on bottom side (1st reflow), Good wetting for 1st reflow.. but .. when I run Top side (2nd reflow).I found that this D

I need to reduce costs on solder paste wasted

Electronics Forum | Tue Jul 19 09:14:49 EDT 2011 | kahrpr

All I can tell you about what people do with solder paste at the end of the day or for the weekend is. What the manufacturer recommends. What people say in public? What companies actually do as far as reusing it? I am not passing judgment on 1 or 3

Universal conveyor help

Electronics Forum | Thu Sep 29 19:45:23 EDT 2011 | edwaterfall01

The conveyor is programmed to turn off the belts and go into an error condition after 30 seconds if the board has not passed the output sensor on the conveyor. The intent is to indicate a board jam and prevent damage to the board or belts. On convey

Universal conveyor help

Electronics Forum | Thu Oct 20 19:23:18 EDT 2011 | eadthem

As far as the buttons go, White = pause for inspection when depressed, lit when active Green = pass after inspection when lit you need to press the button, when flashing its waiting for the upline machine, Yellow/orange = when flashing indicates

BGA re-reflow

Electronics Forum | Sat Dec 24 19:39:43 EST 2011 | dontfeedphils

I've reflowed many different size BGA's in an effort to better the connection and to help the board pass functional test. Using a middle of the road liquid flux and a convection spot rework machine and almost every time I would reflow a failed board


Electronics Forum | Mon Mar 05 23:10:25 EST 2012 | vinitverma

The algorithm only checks if all the 8 parts can be picked up by 8 heads without any mechanical interference during pickup or during rotation. In case if foresees any interference it divides them into two different charges instead of one. You can try

PCB Delamination

Electronics Forum | Fri Jun 01 23:57:21 EDT 2012 | bwjm

HI Guys, i am facing similar issues with this BT resin material too. PCB specs are 4 layers, Nelco400013, same Tg and Td. My PCB delam after reflow. The PCB has both side mounted with SMDs. Initial mounting on the btm side after reflow, no delam. B

Yestech, YesTek, ScanSpection?

Electronics Forum | Mon Jun 04 16:53:39 EDT 2012 | comatose

I have a sales guy coming out to demo a ScanSpection (AOI Systems?) machine. From a little searching these seem to either change names in different territories or pass through different owners. I gather this isn't the "real" YesTech. Price is right,

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