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May 21, 2019 | violate this requirement). In all cases we have attempted different no clean fluxes and combinations of increased and decreased process parameters (flux deposition, preheat, solder temp, dwell time, localized preheat) without eliminating the voiding. The only process so far which has been shown
May 10, 2019 | on the left and right sides of the head assembly respectively. The sensor sends light beam through 3 holes in the body of the head assembly. I have seen dust in these holes as the most likely cause. You can gently clean the holes with a small bristle and blow air into the holes. Be careful not the damage
Oct 17, 2018 | requirement of IPC-A-610 class 3. We aren't going to section because that requirement wasn't priced into the job or required by the contract. The holes I mentioned for inspection are actually for cleaning after processing. Even if we made these boards ourselves, one limiting factor is the presence
Oct 3, 2018 |
Aug 29, 2018 |
the defective ones.
You certainly could migrate to a more aggressive flux - but to what avail? - I do not know about your final product but I would be wary of changing fluxes so quickly without regards to other processes going on after soldering (eg. Conformal Coatings). Typically you will need to clean
Aug 29, 2018 | the defective ones. You certainly could migrate to a more aggressive flux - but to what avail? - I do not know about your final product but I would be wary of changing fluxes so quickly without regards to other processes going on after soldering (eg. Conformal Coatings). Typically you will need to clean
Aug 14, 2018 |
A couple of things to try as I just went through this myself.
Checkout this link for pointers on plasma cleaning...
Apr 3, 2018 |
, Please check and clean the contact pin of the feeder which doesn't power up. If the contact pin is missing, please install it
3. If feeder doesn't still power up, Please try to switch the control pcb from a good running feeder to the unpower up feeder to check again if it lights up. Just like Mr
Apr 3, 2018 | , Please check and clean the contact pin of the feeder which doesn't power up. If the contact pin is missing, please install it 3. If feeder doesn't still power up, Please try to switch the control pcb from a good running feeder to the unpower up feeder to check again if it lights up. Just like Mr
Sep 1, 2017 | into the hole to create a good seal so that the proper suction cannot occur. I have 1 head on the machine and it is happening on several different nozzles on both changers 3 and 4. I have cleaned the nozzles. I've reseated all of the nozzles, and redone the nozzle inventory (and found that it was incorrect
Jul 25, 2017 | individual machine using data from your model. Benefits of doing that are a lot: 1. Clean Repeatable process 2. Documentation - comes from the system that you will be using together with BOM, Reference Designators, part numbers .... 3. All parts and coordinates will come straight from you model, so your
Apr 11, 2017 | was wondering if anyone > ever attempted that. Hello Sr. Tech, you have not tried to just remove the protective mica sometimes they get licked and just have to clean inside, but if you work please let me know, for some future accident greetings
Mar 15, 2017 | the physics directly to LEDs as well. Regarding the reduction in Thermal performance, it's real, not theoretical - the thermal conductivity of Copper is about 16,000 times better than air. However I have no idea what the thermal conductivity of a no clean flux is as that is probably going to be what
Nov 8, 2016 | and reseat the connectors on this PCB and clean the area of any solder paste debris. Also reseat the ribbon cables going to and from the PC motion and I/O cards. If you are familiar with the calibrate logon go there; do not reset the machine just go to the "calibrate" pulldown menu and select each axis one
Oct 24, 2016 | of the board would have some contacts exposed, like those old ISA boards, but with just a few contacts of course). The problem with it is that the board cost increases, and still uses a lot of "real estate". Any suggestion for small+cheap+clean alternatives? Ideally, without having to solder anything
Jul 23, 2016 | > No recommendations ... Too many friends in the trade Fair enough. Dave, I'd like to thank you for making your previous comment, which got me over my irrational fear of water-washable paste. My first tube wasn't the "no-clean-washable" kind -- couldn't find any suppliers whose website would
May 25, 2016 | I tend to get issue on and off with the feeders either stalling and/or running slow/noisy. They are actually pretty easy to clean and maintain. If you take off the side panel of the feeder you will see a few gears, belts and a motor. The first thing to check is that the motor can turn freely
Mar 11, 2016 | to replacing and maintance the sleeves and DP-axis o-rings every week or every 2week. The newer machines (like S20 or higher) need sleeve cleaning which is much faster. They (s15-f3) are good machines but the used software is a really flustrating. Our old production line has freezing and connection error
Jan 13, 2016 | > Thanks for your input Michael. Basically the > boards had been go through from washing and
Nov 2, 2015 | . 2. define Output Region/Resolution(Optional) 3. Output AOI File. Support File format : ODB++/TGZ, Gerber 274X, AutoCad DXF R12, Bitmapu2026. Function : Inspection/None-Inspection Area, Step&Repeat, Selection, Copy, Delete, CleanUp, DRC...etc. And kinds of customized
Sep 26, 2015 | the PCB is probably shifting. If vacuum hold down is poor, try cleaning the grate in the duct below the table and also inspect the vacuum gate for proper operation. If the shift is in the Y direction its possible the Y axis drive assembly has loosening up. To check this gab the machine frame and try
Nov 21, 2014 | etc..) All the transistors are trimmed on a very old GPD CF-10. All other parts are trimmed/formed on another very old GPD CF-8. These machines are more than twenty years old and have never failed beyond what some minor cleaning up can fix. We have looked into selective soldering, but we have
Nov 13, 2014 | is to stay away from any metal as the tin will likely dissolve and contaminate your solder pot. I haven't done this but I would recommend a stone more dense than solder because you wouldn't want some brick floating round the pump space. You would also want it to be clean and crack free so no bits of silica
Feb 13, 2014 | be achieved is product Delta T thermal dependent and ovens thermal transfer capacity-efficiency in given time. All in all open oxygen reflow with T4+ can be a difficult and narrow process window. There are pastes that offer anti-grapping, most are no-clean types I have seen, make flux more robust- higher
Nov 5, 2013 | that are exhibiting the dewetting, to see what's going on thermally. If you're dealing with boards that have been sitting around for a little bit (>3-6 months, say, depending on the environment), I might consider a ramp-soak-spike profile to allow sufficient time for the flux to clean any potential contaminants
Sep 11, 2013 | earlier. Clean the hell out of that shaft from the black piece and as far down as you can. They have a laser etched mark which is black (faint) near the top of that shaft, the red light catches so it know its position. Huske
Jul 22, 2013 | I don't think it is a loose camera lens. We are actually off on the position of the Z-rod. It's not just the camera position that is off. We really can't change nozzles because the z-rod misses the hole in the nozzle changer. We have repeatedly cleaned the glass scale, and we can see no problem
Jul 16, 2013 | to the panel, about to place it, then drop it in the bin. So I cleaned the pick up laser sensors. and it worked again until about the third panel. same problem, same amount of LED's placed. wired (just like how the movie went) I think "I can not believe it is a laser problem", it came up with good minimum
Feb 21, 2013 | The backflow in the wave started to become very important with the development of no-clean/no residue fluxes. These fluxes don’t have (or at least shouldn’t have) rosin, resin or other vehicles in the formulation which encapsulate surface oxides from the wave. The way you describe in the post
Feb 13, 2013 | (pretty average estimate for dish washers, so, I'm applying it to a batch washer). With inlet temps between 60 and 65 degrees, to get the 140-150 degree temps that I want for cleaning water soluble fluxes, I'm looking at 80 degree plus temp rises. I've found some tankless units out there that can handle
Sep 14, 2012 | lining, threephase blowers, have lower power operation vs all the main names like heller, speedline etc as . Most other makers are using galvanised steel or painted steel inners and single phase cap start-run blowers. Cleaning SS is so much easier and less particle generation over life of oven. Other
Sep 10, 2012 | normally run a thermal slug through our ovens once a week to evaluate their heating capacity and use SPC to evaluate the recorded data. This helps us determine when they need to be cleaned for example. Heller claims to have the lowest power consumption, but I don't know anything about their real world
Aug 14, 2012 | can use. The pastes have a higher flux content which means a little more residue than most pastes. It does a nice job of printing its very flexable and there is little clean up, no screens to order. It uses the gerbers to program. it does take longer to program because you are always trying to take
Jul 16, 2012 | at a temperature of 23 °C (73 °F). 7. Avoid contact with indicator spots. Wash any irritated areas with clean water. Handling 1. Store humidity indicators in original container with desiccant when possible and keep sealed. Never reuse a indicator card if it has already changed color. 2. Replace
May 11, 2012 | , and throwing solder paste away each shift. That is a needless waste of money IMO. We have tried several different methods of paste control. NONE of them...I repeat NONE of them showed any significant changes in yields when looking at no-clean formulations. In addition, let me be clear that I am reffering
Nov 4, 2011 | From what I have seen of the Omron software your most interesting challenge and prerequisite for a clean and complete inspection is a full understanding of the color triangle and it's settings. I know you can find almost the same interface/GUI in the open source software GIMP. To find this you may
Nov 3, 2011 | I am being asked by management to setup one piece flow through every operation. We have SMT,DIP,RAD,AX,MANU,WAVE, Quite a bit of hand soldering, Post Inspection, AOI,CLEANING,BARCODING then out the door. We have rougly 60 different products with most having 50 to 100 piece workorders. I struggle
Oct 11, 2011 | There are aerosol spray on flux removers that contain Trichloroethylene. There are also many other
Oct 6, 2011 | corrupted. For example; where a mount/component position should be: 56.34(x), 77.04(y) it would be: -8042.45(x), 0000.05(y)! This was throughout most of the programs. I erased them all completely, except for several that seemed okay. I've reset m.i.s. and cleaned up other data. Basically, when I try
Aug 23, 2011 | experienced, 8 if they are learning. We only do the windmills and PM underneath the turret during the quarterly. These machines will pretty much run forever if you keep them clean and lubed. How long are your PM's taking ?
Jun 15, 2011 | to reflow in a straight shot at about 1.5degC/min. That will help the different substrates of the BGA to stay closer in temperature and help mitigate the TCE problems with the part. Make sure the site is perfectly clean, skip the slolder paste, use tacky flux and control the ramp rate, especially from
Feb 11, 2011 | will let our formal inspectors inspect and any defects will be sent back to SMT for rework. The operator will glance at each board off the reflow, noting any gross abnormality that must be addressed immediately and to remove solder balls before cleaning. Kris is correct in saying that all defects from
Dec 22, 2010 | and too much HASL level in some part of pad, if you would like to use HASL you must answer also on the more question HASL but what type of HASL ?? clean Sn (232degree) or SN100C (227degree) depaend on type of component you use on pcb also you can think about small diameter of solder ball in solder paste
Aug 4, 2010 | > I used to wrench on those all the time! I really > should be more help to you but it was a few years > ago... A few more things to check - clean the > line sensors on the back of the machine. Check > to make sure you don't have a feeder that is > allowing tape to go up
Dec 10, 2009 | We like to keep one fully populated SMT golden per product (high volume) with t-couples soldered to it. We have best results using high temp. solder to attach t-couples (most permanent). 1) Remove all production solder from the part you are wanting to attach t-couple to; wick pads. + clean leads
Nov 20, 2009 | disappear.. This problem also can disappear if we clean the motherboard bottom side, especially near to the BGA bottom side...This action lead them to believe that this could be flux residue that induce this defect... However,as far as I know, flux residue can cause this problem when its absorb enough
May 29, 2009 | We are getting what looks like cold solder joints on one of our boards. The boards have an aluminum substrate, and use OSP plating. The solder is lead free - 96.5 Sn, 3.0 Ag, .5 Cu. The flux is no clean. When we first had the problem, my solder profile was set for typical optimal - 90sec soak, 60
May 13, 2009 | turns but with volume pricing because of the expectation of big things to come. You end up putting hours and hours of extra work into it that you never get paid for. And you may or may not see the production work for your efforts. Proto work can be lucrative if you are lean and clean, and have your
Mar 24, 2009 |
It is very common to use low residue flux with low-standoff parts.
On the other hand, sure you can clean under low-standoff parts. We've talked about this previously. Search the fine SMTnet Archives to find threads like:
Feb 12, 2009 |
that fail from one CM at .4uMhos (~1.25ugr/cm2, ~8ugr/in2, ~.17ppm), that pass from another CM at .27uMhos (~.85ugr/cm2, ~5.5ugr/in2).
is it unreasonable to require a CM that the assemblies (water soluable flux wave and smt, + no clean hand soldering) meet .3uMho's or .9ugr/cm2 or 6ugr/in2?
Feb 12, 2009 | that fail from one CM at .4uMhos (~1.25ugr/cm2, ~8ugr/in2, ~.17ppm), that pass from another CM at .27uMhos (~.85ugr/cm2, ~5.5ugr/in2). is it unreasonable to require a CM that the assemblies (water soluable flux wave and smt, + no clean hand soldering) meet .3uMho's or .9ugr/cm2 or 6ugr/in2?
Feb 10, 2009 | with the product. As I recall (bitterly) the product couldn't wet anything that wasn't absolutely immaculate. Now I find myself wandering about the countryside looking for a comparable replacement for that old 5-core no-clean of a generation past. Crystal 400 seems to be the nearest thing in (what's left of
Feb 3, 2009 | . -Lead process, solder paste Heraus F10 > What cause it become discoloured and nonwetted?? > Is this sign of Nikel oxidation or Au > migration? > > Many thanks, Peter. Thanks for your answers. We have no clean solder process. I have another question: Is Electrolytic Au thickness (0
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