Electronics Forum | Mon Mar 21 12:36:22 EDT 2011 | scottp
I would run the passive side first just because the BGA is probably moisture sensitive and I wouldn't want to have to keep track of the time between first and second reflow.
Electronics Forum | Mon Mar 21 12:43:20 EDT 2011 | hegemon
Passives first reflow, and BGAs second side reflow. Uses only one heating cycle for your BGAs, and the passives will stay in place just fine given correct profile parameters. There are a few exceptions, but this is generally how it is done. My $.02
Electronics Forum | Sun Mar 20 15:05:28 EDT 2011 | floydf
We are preparing to run a 2-sided board with BGAs on one side and passives on the other side. We have two schools of thought on which side we should run first. One school says run the passive side first, then run the BGA side and the surface tensio
Electronics Forum | Fri Sep 14 02:27:30 EDT 2007 | pavel_murtishev
Good morning, Those random stops are typically related to wrong vacuum limits calibration. Have you calibrated vacuum limits for each nozzle? BR, Pavel
Electronics Forum | Fri Sep 14 02:59:09 EDT 2007 | saab
Out of curiosity, I measured the vacuum levels on our Topaz. With a #31 nozzle the values read somewhere between 130 and 150 when open and about 200 when blocked. The component pickup works fine with no errors with these values
Electronics Forum | Fri Sep 14 12:32:40 EDT 2007 | sarason
Are you sure there wasn't solder stuck up the nozzle. Which would make for a doggy pressure indication?
Electronics Forum | Fri Sep 14 13:52:35 EDT 2007 | slthomas
100% positive. First thing I did was check the nozzle, plus it was happening with all nozzles on head 1. It's definitely in the circuit somewhere.
Electronics Forum | Mon Sep 17 18:12:54 EDT 2007 | sarason
Then look for a disconnected supply or earth to the head. A dodgy cap (high ESR) on the supply of the board. Put a CRO on the supply and check it's supply and earth to chassis and to each other and then compare the level to other boards in the machin
Electronics Forum | Thu Sep 13 10:49:24 EDT 2007 | slthomas
If someone knows specifically what the sequence of events is in a Topaz placement step I'd appreciate it if you could share that with me. We've developed an intermittent problem with ours where it places the part and immediately stops with E0873. T
Electronics Forum | Thu Sep 13 14:18:59 EDT 2007 | slthomas
Just a little status update. When it's running and I monitor the I/O, the mount vacuum bit never turns over to 0. It may be turning over enough to run, but not long enough to see on screen. It stays at 1. When it errors, I can trip it by putting my
winsouce.jpg)
