Electronics Forum | Fri Feb 13 11:46:23 EST 2004 | Jack
Is your customer trying to reduce voiding? If the device is using Sn90 / Pb10 and the paste is Sn63/Pb37 the board will melt first. However, if both solders are 183C eutectic, it's a tossup? PCB design, copper weight, bga type (pbga, micro bga, Tbg
Electronics Forum | Thu Feb 12 14:26:22 EST 2004 | Kris
Hi all, We have a PCB without any BGAs on it which goes into harsh environment.We therefore conformal coat it. After assembly the PCBs are expected to withstand "85degc/85%RH for 1000 hours" We now want to add a BGA to the PCB. Does any one have
Electronics Forum | Fri Feb 13 09:17:11 EST 2004 | Kris
we are worried about the coating not being able to cover underneath the BGA. If the coat is excessive then it would cause CTE issues. Also if anybody has data on 85/85, 1000 hrs after conformal coating of BGA, would appreciate if you guys can share
Electronics Forum | Fri Feb 13 17:55:49 EST 2004 | Dale Freeman
I populate several thin panels (0.032")using a Samsung S-2000 P-N-P machine. With panel sizes of 8" by 10", it is very difficult to clamp the panels into the machine with deflection and bowing. Also, the Samsung makes it very difficult to adjust the
Electronics Forum | Mon Mar 01 23:37:49 EST 2004 | Bill Ladakos
I would recommend trying a Board-lok Tooling support fixture. In my opinion, no other tooling support system or fixture compares to the type of support board-lok provides. They can manufacture the board-lok with many options such as vacuum, tooling p
Electronics Forum | Sun Feb 15 17:32:08 EST 2004 | brian bennett
i have always found any of the alcohol based solvents good.here in the uk we use the alpha make.with screen auto wipes i found the set up to be most important.i.e how many pcb's printed before wiping.i found running pcbs with bga and .50 pitch compo
Electronics Forum | Mon Feb 23 12:22:32 EST 2004 | esoderberg
I have an MPM SPM and two Ekra E4 screen printers. I have always run them dry with vacuum. I am also using no-clean paste and have not had a problem. The volume I run per day on the machines is 4 - 6,000 bds
Electronics Forum | Wed Feb 18 12:18:28 EST 2004 | babe
Sometimes this is related to oxidized paste or paste that has sat onthe board too long before reflow. However most likely this is related to your reflow process. either too slow or too fast of a reflow ramp rate. Heating up an assembly too quickly wi
Electronics Forum | Mon Feb 23 07:09:28 EST 2004 | Erv
We have been using the 3M Electronic Service Vacuum Cleaner for a couple of years. The buisness end (hose and nozzles) is ESD Safe, it's Easy to use, and filters are a snap to change. The case is not ESD Safe, but if you do not set it on or right nex
Electronics Forum | Mon Feb 16 07:11:25 EST 2004 | paul_bmc
Does anyone know how often the optical sensor goes bad on the CS-400E machines. I have 2 machines and it seems that the optical correction does not work anymore. I keep getting an optical correction error, when the mode is turned on the correction
