Electronics Forum: pass (Page 68 of 142)

PCB Pad become brownish after IR reflow

Electronics Forum | Fri Sep 18 09:18:06 EDT 2009 | ysutariya

Also, it wouldn't hurt to perform SERA testing to determine the amount of free tin to begin with. From what I remember, I think you need 30 microinches of free tin to ensure success. XRF won't give you an accurate thickness reading as it counts the

AOI for solder inspection

Electronics Forum | Sat Nov 07 10:09:52 EST 2009 | ramses2001

Hi Nemo, In my factory we have an offline AOI from VISCOM for two SMT lines. It's not so easy to program, but the results are very good. Anyway you should have to think that an AOI system needs a human inspector and a technician to debug the program

Bubbles on solder joint(after conformal coating curing)

Electronics Forum | Fri Dec 18 09:07:24 EST 2009 | tommyg_fla

dave, where I work they are having the same problems with 1B31 acrylic. The coating thickness is 6-8 mils dried so that have to do several passes with an air dry between them and a final oven cure. They think that it might be related to the heating r

Motherboard become NO POST when humidity increase to 90%

Electronics Forum | Tue Nov 24 19:07:12 EST 2009 | gregoryyork

I agree Patrick many people blame the assembly fluxes when it is some other hygroscopic chemistry left on the bare PCB such as surfactents from the HASL process these will do exactly what the guy reported in his post fail then cool down and pass ever

Topaz - New to me - L305 SoftLimit... ??

Electronics Forum | Tue Feb 09 09:18:13 EST 2010 | davemacnemo

Machine installer gave me some tips and a run through the software. Everything worked just fine. First solo attempt to run product that we started with gives L305 SoftLimitOver... error after picking first components and passing over camera. Additio

Strange things ocuring during reflow...

Electronics Forum | Wed Feb 17 14:45:40 EST 2010 | dcell_1t

Is your oven adjusted correctly for temperature > and blower and conveyor speed? As far as blower settings it only has a Hi-Mid-Low setting (is a heller 1809), and we have been working with all at Hi speed since line was started (1.5 year ago). Co

X-Ray Inspection

Electronics Forum | Tue Mar 02 16:49:37 EST 2010 | davef

For a earlier, similar thread posted by an old friend Cal Driscoll ... Classes of BGA inspection machines * GO/No-go Machine specs: 50Kv, limited zoom, perpendicular head, board size. * Low to mid range machine:+75Kv, Angular inspection,zoom,image c

Cleaning OA flux with vapor degreaser

Electronics Forum | Tue Mar 09 14:23:03 EST 2010 | zanolli

Hello SMTnetters We have a unique application requiring cleaning of an aggressive OA flux. A vapor degreasing process or the immersion of the parts in boiling solvents has some process advantages over an ultrasonic aqueous process. These advantages

Pin hole

Electronics Forum | Thu Mar 11 03:03:26 EST 2010 | grahamcooper22

Hi , Looking at your photo....can I also see a hole in the middle of the joint on the chip component ? Maybe its not just a problem with th ejoint son diodes ? Did you also get mid chip solder balls on chips? If so, I'd almost guarantee the pcb has t

smd led storage

Electronics Forum | Tue Mar 23 03:42:51 EDT 2010 | grahamcooper22

Hi, It is very important to follow IPC JEDEC 33 specification for storage and handing of all MSDs. In many instances defects caused by excess moisture in packages is not immediately evident (pcbs may pass final test) but when pcb has been in the fiel


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