Electronics Forum | Mon Jun 08 20:03:07 EDT 1998 | Dave F
| Chiakl | Ion Chromatography has been perfectly described by Dave, but here are a couple of extra considerations: | Ion Chromatography will tell you precisely what is present on the surface of your board/assembly but it will not tell you whether it
Electronics Forum | Fri Jun 05 15:06:26 EDT 1998 | Dave F
| I have just been assigned to look into the ionic chromotograhy test on our PCBA but I have zero knowledge. Could anyone help to explain what is this test about? Is it | a) a destructive test? | b) What is the measurement unit of this test? | c) Wh
Electronics Forum | Fri Jun 05 10:24:56 EDT 1998 | Earl Moon
| I have just been assigned to look into the ionic chromotograhy test on our PCBA but I have zero knowledge. Could anyone help to explain what is this test about? Is it | a) a destructive test? | b) What is the measurement unit of this test? | c) Wh
Electronics Forum | Thu Jun 04 22:47:58 EDT 1998 | Dave F
| My company recently purchased 3 new Phillips CSM machines and is interested in buying a Screen Printer. The one problem we have is that we have to change setups three to four times a day. Due to the small runs of one type of boards that we do. My
Electronics Forum | Mon Feb 01 15:18:58 EST 1999 | doug clement
| | My company recently purchased 3 new Phillips CSM machines and is interested in buying a Screen Printer. The one problem we have is that we have to change setups three to four times a day. Due to the small runs of one type of boards that we do.
Electronics Forum | Thu Jun 04 14:47:56 EDT 1998 | Steve Gregory
Hi Tim! There are two belt feeders that I've worked with that I can comment on. You're right about vibe feeders, they're good for one thing as far as I'm concerned...they make okay boat anchors, not good, just okay....(GRIN) The two that I'v
Electronics Forum | Wed Jun 03 18:22:19 EDT 1998 | Chrys
| Hello: | BACKGROUD: SMT components soldered on the top-side of boards that also require wave soldering have the potential to reflow during wave soldering. Reflowing these components during wave soldering is not good. It can cause cold joints, op
Electronics Forum | Mon Jun 01 17:41:59 EDT 1998 | Jim Hoxie
First of all let me say that we are currently placing other 240 pin QFP'S with no problem. But none of them have the MASS of this beast. The part is a XILINX XC5215-6HQ240C which has a large metal heat sink covering most of the bottom of the part. T
Electronics Forum | Tue Jun 02 16:02:13 EDT 1998 | Earl Moon
| First of all let me say that we are currently placing other 240 pin QFP'S with no problem. But none of them have the MASS of this beast. | The part is a XILINX XC5215-6HQ240C which has a large metal heat sink covering most of the bottom of the part
Electronics Forum | Tue Jun 02 08:30:30 EDT 1998 | Jon Medernach
I have to agree with Steve. If the problem is progessively worse the problem is the pitch conversion that was used, and I have seen it before. It may be masked by the solder paste which could be on pitch but after reflow the paste wickes to the pad
