Electronics Forum | Fri Jan 25 15:51:26 EST 2013 | johng
Water soluble process, yes. The machine is old and fixed at 4 ft/min by someone way before me. Looking into ways to reverse that to allow for adjusting the conveyor. Trying to determine how the contamination gets onto the boards. So far testing has i
Electronics Forum | Mon Jan 28 08:44:21 EST 2013 | diamondmt
John, In addtion to the cleaning process you may wnat to look at the masking materials you are using as well. Are you using any temporary masking tape? If so, do the dewetted areas coincide? Some of these tapes use a silicone-based adhesive which wi
Electronics Forum | Fri Feb 22 16:32:56 EST 2013 | davef
Jorge: I took this total posting to several fabs at IPC APEX. None was satisfied with the answers you receive from your supplier or the Forum members. They suggested that you get your board analyzed. They were surprised that your supplier didn't in
Electronics Forum | Wed Feb 27 08:46:01 EST 2013 | luisrestrepo
Dear Chifutbol, Sir Gemline PPS is not compatible with vista or windows 7. This software product is no longer supported. You need to use XP to run the software and a pc with a floppy or use a usb floppy becuase to register the machinces you need a fl
Electronics Forum | Fri Feb 08 10:19:45 EST 2013 | ryand
That all sounds about right. Few minor differences in acceptance rates (I like to have it around 60% to catch missing parts) but it's a close mirror to what we run. As for the tant caps, we have better luck searching for the markings to verfy polarit
Electronics Forum | Fri Feb 08 10:29:26 EST 2013 | phase1
Good to hear, thanks for the response. Once you get the program fine tuned, do you generally have most boards that are inspected pass with the green good screen or do you generally have to review a few defects? OF course this all depends on passing r
Electronics Forum | Thu Jan 31 11:09:38 EST 2013 | emeto
Hello folks, we would in certain cases run a PCB second time through reflow. I never trusted a board that is reflowed multiple times and I wonder am I really right? Can we reflow boards multiple times? What are the limits? Does it depend on the PCB
Electronics Forum | Fri Feb 01 05:18:59 EST 2013 | eniac
If you have a hard-gold on your pads, it's not a problem. Hard gold can give to you 4 or 5 times for PCB soldering (BGA repair). Soft gold (or flash-gold) can destruct, after that will start a migration of nickel up through gold, your pads will be
Electronics Forum | Fri Feb 01 10:54:35 EST 2013 | dyoungquist
Regardless of the surface finish, you should try to limit the reflow cycles to 3 with no more than 5 at most. This includes reworking a BGA site as well. Remember that heating/cooling to remove a BGA is one cycle and heating/cooling to place a BGA b
Electronics Forum | Fri Feb 01 14:49:52 EST 2013 | emeto
Thank you guys. You keep adding valuable information here. I think we will try to stick with the 3 times reflow(if we count the BGA repair as 2 reflows). However sometimes we will run the board second time through the oven(just flux the suspect part
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