Electronics Forum | Tue Mar 31 05:26:14 EDT 2009 | d0min0
Hello, we had similar problem in the past - when we had to change PCB supplier from a batch of hundreds of boards (NiAu plated, SnPb process) we got 2-3 boards with paste wicking to components leads what we did, was to check the thickness of gold on
Electronics Forum | Mon Jan 26 10:15:51 EST 2009 | john123
Can anyone help me determine the acceptability level for lead deformation (see attachment). The outer two leads on the left side were bent during the pick and place centering operation. I've looked in the IPC-A-610 book and could only find informa
Electronics Forum | Tue Jan 27 02:00:40 EST 2009 | sachu_70
Your image does not clearly explain the problem. However, I can see a good heel fillet formation at the joint. In general, TSOP leads are delicate and should handled with immense caution and good ESD protection. First let us be clear that any "rework
Electronics Forum | Thu Jan 29 06:29:33 EST 2009 | sachu_70
There are two profiles available for the Pb-free process: (1) RSS and (2) RTS. In your case, you should try a solder paste that supports RTS profiles. A minimum of 7 zone Refow Oven would be fine on the Pb-free process. However, you may still try by
Electronics Forum | Thu Jan 29 11:30:56 EST 2009 | rgduval
As others have said, you'll have some difficulties getting good reflow on pb-free out of a 3-zone oven. We did it with a 4-zone for awhile, but only had really good success on low thermal density boards. That said, you should definitely check your
Electronics Forum | Thu Jan 29 16:51:57 EST 2009 | gregoryyork
Hi Small ovens work fine if the settings are correct and I seriously doubt 55cm/min is right. Profile it and speed down to around 35cm/min. Increase first zone to around 170 keep second at 208 but increase last to around 280 BUT profile to check it
Electronics Forum | Fri Jan 30 15:11:50 EST 2009 | joseluis_amper
Dear Sir. Recently we had a problem in our production. We had pcbs with no RoHs (with solder Pb in pads) but we used paste Lead Free. I want to know if we will have problems in this solders in the future, because (perhaps)the solder will be broken, o
Electronics Forum | Tue Feb 03 03:35:30 EST 2009 | sachu_70
Hi Jose, such a process is possible, but you need to confirm that the PCB material has high Tg. In additon, you need to re-look solder paste printing parameters and make required changes in stencil apperture design for optimum solder volume. Just a
Electronics Forum | Tue Feb 03 10:25:56 EST 2009 | milroy
Hi What is the surface finish you have? Following are true if you have HASL-LeadFree surface. I have had the same problem 3years ago and we did some micro-sectioning for further analysis, still the boards are functioning properly. But you have to
Electronics Forum | Sun Feb 01 17:28:24 EST 2009 | tpappano
The feeders on the CSM84 actually feed the tapes forward by the force of a spring. On the 8mm and 12mm feeders the spring is loaded directly by the force of the push rod on the placement head. With the larger tapes like 16mm and 24mm, a stronger sp
