Electronics Forum | Tue May 13 08:59:13 EDT 2014 | gazelle
Hello davef - could it be you are confusing low thermal emf (Seebeck coefficient) with low temperature solder ? I am looking after solder wire and paste with low Seebeck coefficient - cadmium based alloy was OK but banned in europe due to RoHs direct
Electronics Forum | Tue May 13 17:53:54 EDT 2014 | anvil1021
Hello Michel...this might be a bit of a battle finding the low thermal EMF material that you are looking for. The first one that comes to my mind is Bismuth Selenium Telluride, with either a nickel or cobalt doping agent. Silver went away from this
Electronics Forum | Mon May 12 12:58:07 EDT 2014 | emeto
Hello all, I have a diode(gold plated)on some assemblies that gives me a a hard time. The paste is wetting too good and climbs the lead of the component and touches the body which is a defect. I just wonder what if there is a way to heat the board e
Electronics Forum | Wed May 14 18:22:07 EDT 2014 | hegemon
Dave is touching on one of those magical things that keeps us process engineers well paid and dancing (Well, some of us, lol). Heavy boards with light components. Solder Follows heat. Component heat up earlier. Repeat, Solder follows the heat. Care
Electronics Forum | Thu Jun 05 19:19:13 EDT 2014 | FD
When you assign the feeder location, there is a default XY value that gets assigned to that location. When you teach the actual XY pick position you move away from that default position, and if the actual pick position is too far away from the defau
Electronics Forum | Fri Jun 06 02:35:06 EDT 2014 | maciejbilu
Got it. That make sense. Pick position is quite far from these "normal" one. I ignore the message (and press start button again) every time and the whole mounting process starts normally. JUKI mount every component assigned except one from 44mm feede
Electronics Forum | Tue May 20 04:34:59 EDT 2014 | sarason
Well that would be a response from the VME bus. Is the PCBoard, the only controller on the buss, or is there a second controller that talks to interface boards etc. If so you might just have a problem with the second controller. Check the control sig
Electronics Forum | Wed May 21 15:13:56 EDT 2014 | wendynguyen234
Sarason, thank you very much for your support. There is an ISA interface board with just ribbon cable from window 95 PC to VME I/O DPRAM ver. 2 board in the same VME rack that has MVME-162-110 (CPU board), DSP, ADDA, AXIS & CONT boards. Do you think
Electronics Forum | Tue May 20 07:55:27 EDT 2014 | andrzej
Hi, I am facing an issue with PB-free HAL on our boards (270 pcs of 800pcs lot). I look for a root couse for this issue and I guess it is strongly related with PCB manufacturing process. In attachment you can see PCB with dark pads. They turned grey
Electronics Forum | Fri May 23 04:22:39 EDT 2014 | andrzej
Thanks Hege. I've done some research and this might be the root couse: 1. Too thin HAL layer which leads to formation intermetallic Cu-Sn layers on surface after 1-st reflow (most probably) 2. Poor quality of solder for HAL process. 3. Problem
