Electronics Forum | Wed Aug 22 21:44:04 EDT 2007 | davef
Questions are: * Do these boards meet IPC-A-600? * What does your supplier say is the source of this color variation? * What steps is your supplier taking to make the boards more acceptable?
Electronics Forum | Wed Aug 22 16:00:02 EDT 2007 | razor1
The color variation in the solder mask from our PCB supplier varies to the point that we have problems with our AOI recognition and accuracy. We have not been successful at finding an industry spec which outlines solder mask color requirements. We
Electronics Forum | Thu Aug 23 11:24:16 EDT 2007 | hussman
Welcome to Chine. Your best bet is to specify the type of mask you want and the type of finish you need. If not, they run what ever they have available. You may want to contact you board vendor and find out what they can offer. That's what we had
Electronics Forum | Tue Aug 13 12:07:16 EDT 2013 | marcpeo
Hi, Please give a call to Bilal Malhi Service Manager at Heller. +1-973-377-6800 EXT 312 Bilal and his team can walk you through some easy steps to determine the cause. Should be relatively quick to get to the bottom of it! Best, Marc
Electronics Forum | Tue Aug 20 10:07:44 EDT 2013 | mccabekev
I moved the fixed rail in by about 2 inches and it seems to have done the trick. Rail movement is easy, moving machine to keep all conveyors in line not so easy
Electronics Forum | Tue Aug 13 06:23:51 EDT 2013 | mccabekev
We are running a Heller 1707 EXL reflow oven, but we have a temperature variation across the board. When the oven first comes up to temperature, the centre of the board is 10degC hotter than the inside rail which is a further 10degC hotter than the
Electronics Forum | Tue Aug 13 09:41:03 EDT 2013 | horchak
If it's forced air convection I'd check all the circulating fans and filters. Also if its a clam shell bonnet make sure it's closed all the way and the seal is good. You didn't specify whether it is one zone or the full length of the oven, I do not w
Electronics Forum | Tue Aug 13 10:22:13 EDT 2013 | mccabekev
We are seeing this the full length of the oven. We run a lot of double sided boards, so we cannot run them on the wire mesh. I checked inside the oven to ensure there was no build up of dropped parts that could block it. The temperature difference
Electronics Forum | Tue Aug 13 11:20:41 EDT 2013 | horchak
Is this a new issue? You could run a wide piece of masking or duct tape along the oven seal on the outside just to see what happens. What is the heating plate configuration. Are they solid from front to back or split. My thought here is if there is a
Electronics Forum | Tue Aug 13 10:09:10 EDT 2013 | dyoungquist
We have a Heller 1707EXL that we use for lead and lead-free production. It has both a mesh belt and edge rails. We run 90% of our assemblies on the mesh belt (leaving the edge rails wide open). I have noticed when profiling a board on the mesh bel
