stencil cleaning

"stencil cleaning" search results in the Electronics Forums



9777 result s found for "stencil cleaning" in the Electronics Forums

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nozzle cleaning GSM

May 20, 2013 | nozzle cleaning GSM i been trying to do that with a lot of my customers but they can not clean that well it works for just one time but you have to remember than this parts are platic, and will have some damages, i can sell to you quality nozzles at the best price on the market and spare parts for gsm contact me

baking out pcbs after reflow process

Jul 6, 2012 | All i used to do was blow them with an airline to remove the excess moisture then bake them for 15/20 min at 100' in an oven and that seems to work fine, i did get the info from a 4 stage cleaning guide for the actual cleaning solution we used but it was a long time ago and i cant remember what

raw copper on pcb

Jun 7, 2012 | Hi, I have pcbs (Duroid/RT 5880) with raw copper, soldered in vapour-phase chamber at 230 degrees Celsius. During soldering, copper gets tarnished. Cleaning with Vigon A250 removes the tarnished layer. Indeed, in the VigonA250 techn. datasheet it is reported that the clean agent attacks copper. Do

Conveyor Belt Cleaning

Feb 7, 2012 | Conveyor Belt Cleaning What Should I use to clean a sticking conveyor belts in my pick an place machine (Quad IVc)? The belts seem to have what I would guess to be solder paste that is dried, but also they seem to be a bit gunked up as if they had gotten some oil or grease on them in places. They do seem to be a bit

Contaminate PCB surface

Dec 3, 2011 | We can't tell much from your pictures, except there are rounded gray blobs that could be solder. If that's the case, you need to get that solder hotter. Please give us the temperature readings of those blobs during reflow. You mentioned that you're using IPA as a cleaning agent. IPA doesn't work . It is a hazardous material and is a fire hazard. What are you trying to clean from these assemblies?

Electrical Wiring Anomaly

Nov 9, 2011 | By no means clean room but pretty clean environment. We have ultrasonic air humidifiers maintaining our air at about 45 RH. I agree with you about airborne stuff attaching to electro-static. It's a mystery why it is isolated to four machine, though. These machines are all powered by a big UPS

Which No Clean for Selective?

Oct 19, 2011 | Which No Clean for Selective? Hi, we have ERSA flow selective machine. We are using 420s-lf No-Clean flux (lead free process). It is water based. Before that we used for about 2 years in JS-EU-31 (KOKI) (alcohol based). It did excellent job (we moved to water based flux just because environmentally issues).

Beaker Scale Testing for flux cleaning chemistries/surfactant

Apr 23, 2011 | Beaker Scale Testing for flux cleaning chemistries/surfactant As am doing screening right now, am not measuring the total cleanliness yet, i just observe by taking photos (FYI, am varying speed for conveyor belt for cleaning) and see whether the flux is able to be removed by certain parameters. the speed am using is 0.3,0.5,0.7 and 1.0 m per min..

Saponifier Wash Process

Mar 7, 2011 | Shean, One of my customer requested that their product shall be process utilizing no clean chemestries and washed utilizing appropriate saponifier and rised with DI water due to the high voltage of their assembly. I wanted to convince my customer to use the normal lead-free water soluble flux process that normally does the job instead of the no clean with saponifier.

Cleaning a No Clean

Jan 14, 2011 | I much prefer your definition of quality SheanDalton. LOL But customer expectation is King. They

I need some clarification on washing boards that are no clean

Nov 2, 2010 | I need some clarification on washing boards that are no clean I just need a clarification on NC254 No clean solder paste. If we have parts on the bottom side of the board that already are soldered and we go to run the other side of the board and it was misprinted, is it ok to run thru the washer? I just need clarification, because of so many opinions.

Solder Balls-No Clean Paste

Aug 17, 2010 | Solder Balls-No Clean Paste Since you have home plated the apts and done solder reduction, I would take a look at your soldering profile. We have run into this before when running no-clean and found that reducing the initial ramp rate to the flux activation was a help in the reduction of both mid chip balls and the random

Solder Balls-No Clean Paste

Aug 17, 2010 | Solder Balls-No Clean Paste I have a question that has been discussed many times, but is always good to get some new insight. We have lots of issues with our no clean process. We use a Kester EP256 solder paste. I would just like to get some general tips on how to get rid of mid chip balls. Please offer any suggestions

FOD

May 25, 2010 | Hi, Use nitrile or latex gloves for handling your product from your pre-coating cleaning step onward. In my opinion, conformal coating should be isolated from the rest of the factory floor. I'm not saying you need a clean room or even a white room. You simply need an environment where you can

Cleaning BGA pads prior to rework

Apr 8, 2010 | Cleaning BGA pads prior to rework Hi, Looking for views and some opinions on the best systems to use to clean pads (particularly BGA) prior to carrying out replacement of parts. I'm thinking of vacuum type desoldering systems. Obviously braid is an option which we currently use, but it's not so good in some applications. Thanks

PCBA Cleaning rags

Apr 1, 2010 | PCBA Cleaning rags -Are these lint-free rags ESD-protected = yes, must be. I left that out thanks! -How do these lint-free rags remove the flux that seeps under components = no matter its a no-clean material and we are removing for esthestics only. -Have you considered flux pens as an alternative to your current

Mixing No-clean and water soluble processes

Feb 25, 2010 | Mixing No-clean and water soluble processes Sorry, but I don't know this brand. Anyway pay attention, because if the chemistry is resin based, is difficult to clean and the residuals may be hygroscopic. So, I only can suggest you to read the data sheet and follow the instructions by the solder paste supplier about the washing additives

Mixing No-clean and water soluble processes

Feb 24, 2010 | Mixing No-clean and water soluble processes Agree with what has been said so far. Check with your end customer and make sure the white haze appearance of the board will be acceptable. You will never get the board to look like it did before you started. It may be clean but it won't look like to some people and possibly cause for rejection.

oil contaminated PCB cleaning

Feb 5, 2010 | oil contaminated PCB cleaning Baild1632: We've talked about ultrasonic cleaning of assembled boards here on SMTnet several times. Search the fine Archives to find threads like: http://www.smtnet.com/Forums/Index.cfm?CFApp=1

ionic residues on the surface of printed circuit assemblies

Sep 2, 2009 | contacts for cleaning contractors are: * Petroferm Contract Services [www.partscleaned.com] Franklin, Ky * Aqueous Technologies [www.aqueoustech.com] Rancho Cucamonga, CA * FinePoint Precision Cleaning [www.finepointinc.com] Kokomo, IN * Austin American Technology [www.aat-corp.com] Austin, TX

PCB residue after wave solder

Aug 28, 2009 | I had seen such effect caused by the wave itself, where the exposed wave surface was coated by a thin dull oxide layer which then adhered to the bottom side of PCB during wave soldering. You could verify if the wave surface is clean metal when the PCB contacts the wave. During wave soldering , the leading board edge should push out this oxidized surface layer to allow clean metal exposure to PCB.

No-clean, water-based flux residues after wave...

Feb 3, 2009 | No-clean, water-based flux residues after wave... The spec for all PCB suppliers is "solder mask over bare copper using LPI on external layers (green)". The flux we use is No clean 270WR flux (AIM). As far as process parameters, like I mentioned before, same parameters for several suppliers, only one shows more flux residues (or solder mask

Clean vs No-Clean

Sep 9, 2008 | Try the "straw test" to test for ionic contamination. For reference, here it is from the fine SMTNe

Disposal of ultrasonic cleaning water

Jun 24, 2008 | Disposal of ultrasonic cleaning water There is also an article in the March 2007 issue of U.S. Tech magazine that reviews ultrasonic cleaning technology for PCBs titled "Reducing the Cost of Misprinted PCBs". The information is also relevant to post reflowed PCBs. A PDF copy of the article is available at:

Ultrasonic Cleaners

Jun 16, 2008 | Try Crest-ultasonics.com Their sales people can help you with the right model number for your application. We have a couple of smaller units with years of service. Ask and see if circuit boards are an appropriate application. Ultrasonic cleaning is a little violent. When cleaning Cp6 nozzles

Cleaning station installation reqirements

Mar 31, 2008 | Cleaning station installation reqirements Huh, Are you asking to keep SMT and a cleaning unit for the boards in seperate rooms? That is not needed if that is what you are asking. But, I dont know the size of the room you are referring too so I dont know. We actually have our wash in the same room with our SMT lines as it helps put moisture

Old m/c

Mar 17, 2008 | You might also try pulling the vision gantry and/or the camera cube off the machine, remove the air nozzles, clean them, and reinstall. They are easy to lose - be carefull. It's possible the air hockey "air pad" that these things are riding on is uneven and the parts are getting stuck on the gantry rails. Clean the gantry rails when done.

no-clean flux vs. impedance

Feb 18, 2008 | no-clean flux vs. impedance In theory, no clean flux residues are electrically benign...period. Here's a good test. Subject the board to some moisture/humidity, and have your circuit designer ohm-out any areas that may be affected by conductive material. Option B: Have a lab, like Trace Labs, verify ionic cleanliness.

Dirty Reflow owens.

Jan 31, 2008 | My first thought is that your roof exhaust blower is dead and that these boards are the only no-clean boards you build but that's probably not the case. To start from the beginning, though, are all of your blowers operating normally (in the oven and whatever fume exhaust system you are using , usually a blower on the roof), do you measure your vent airflow regularly, do you have filters that need to be cleaned, etc., etc.?

Cleaning procedure when WS609 flux is used

Jan 29, 2008 | Cleaning procedure when WS609 flux is used Dave F....BOGUS BOGUS BOGUS What compatability issue could there possibly be if the flux is removed during wash???? Why on EARTH would you leave ANY WS flux residue on the board? A recipie for disaster! Beef up the cleaning process, test for contamination, beef it up again if required. Ionic

Micro Solder Balls in No Clean Selective Solder Process

Jan 9, 2008 | Micro Solder Balls in No Clean Selective Solder Process Matte solder mask greatly reduces the potential for solder balls, and since you altered the machine parameters with no improvement it might be flux related. Do you use a VOC free (water based) or alcohol based no-clean flux? Do you use machine settings following the flux manufacturer

Rosin vs. Resin Flux

May 31, 2007 | Tnks Davef, be patient pls, what does it exactely mean? That one of the two, in case of cleaning needs the flux residues are more difficult to remove for one of the two fluxes ? i.e. NC wire fluxed by ROL0 compared to fluxed REL0, in terms of soldering point of view I should have same results , but in the worst case of cleaning needs I should pay attention by selcting the correct one, correct ? other ? Regards..... GSx

Board cleaning machine problem

May 16, 2007 | Board cleaning machine problem Hello For long time we are fighting with problem to reduce/eliminate electrostatic charge caused by board cleaning machine- we re using Teknek machine. Maybe u guys have idea or from ur experience u know how to reduce electrostatic charge at sensitive components. The charge can damage

No-Clean Solder

Mar 5, 2007 | No-Clean Solder We use (and have for some time) used No-clean on our radio boards with no problems. We also conformally coat with a platinum catalyzed, addition cure silicone coating with occassional problems. These silicones are prone to cure inhibition or retardation (drastic slowing of cure). If the flux

No-Clean Solder

Mar 2, 2007 | No-Clean Solder We are in the early stages of converting al of our customers to No-Clean solder. I expect some customers to have no objections, others I am sure will be concerned about the "residue." I know that chemistries have improved greatly and if the process is solid, residue is not an issue. Is this true

QFN - FCT failed after reflow

Feb 6, 2007 | The QFN is found to have contact problem during FCT. The paste that I am currently using is SnPb 63/37 water soluble paste. Is it because of water soluble paste? (unable to clean after reflow process as QFN is entrapped by paste/flux) Should we use no clean solder paste on this?

flux residue after HAL

Dec 27, 2006 | water alone especially cold is not good enough, how do you check for hasl fluids when most residues left behind after improper cleaning are non ionic. Use 40C saponifier followed by heated rinse then cold rinse then DI rinse followed by dry.Nylon brushing is OK as long as fed with hot saponifier as well.No cold water as flux could gel and harder to clean off best of luck

Foam Fluxer problems

Dec 18, 2006 | Real tough to foam that no-clean formula there. Most no-cleans are notoriously difficult to foam. I assume that you have both a pressure and a flow regulator. low pressure and high flow are keys to fowm head height as well as S.G. also make sure that you have the level of flux somewhat low

HIGH VOLTAGE AND FLUX RESIDUE

Nov 27, 2006 | HI THERE GUYS ,GALS, DOES ANYONE KNOW OF A SPEC OR TEST OF THE AFFECTS OF HIGH VOLTAGE (300-1KV)ACROSS CONNECTIONS SOLDERED WITH NO-CLEAN. COULD THE FLUX BREAKDOWN AND CAUSE A CURRENT PATH? I HAVE CHECKED THE SPECS ON OUR SOLDER AND THE TEST METHODS WERE BELOW 100V. IS NO-CLEAN SOLDERS TYPICALLY

Flux residue cleaning procedure

Oct 30, 2006 | Flux residue cleaning procedure So, after the repair of a BGA, you notice white reside on a nearby connector. Correct? [Sorry we're so dense. Long day.] Tell us about: * Flux class used in repair * Flux class used in original assembly Why are you baking the assembly after repair? What cleaning process does the board see after

Board washer

Oct 30, 2006 | or Kyzen, with chemical isolation and other options to clean non water soluable flux residues, such as no-cleans and RMAs.

Flux residue cleaning procedure

Oct 29, 2006 | Flux residue cleaning procedure We have a current problem on our packages after we bake it for 24 hrs prior BGA rework. Flux or white residues found on the connector leads and terminals that cause not contact problems during mating. Could you help us how to clean the fluxes properly and how could this phenomeon happenned?

Contaminants after SMT which affect wire bonding

Oct 6, 2006 | Hello, Do you have lift bonds?> What is the solder finish of the board?. If this is gold, maybe you should check the reflow profile and max temperature which can easely kill your gold coating so problems with bonding. Also we are using Prozone Multicore with ultrasonic to clean the board after lead free no-clean process. It is helpfull with getting good strong bonds. Regards David

SMT Adhesive

Sep 28, 2006 | Good afternoon, We use PD955M daily and are also happy with PD955M. Consider PD955�s printable version: PD955 PY or PD955 PR (difference is only in color: red or yellow). Do not use IPA for cleaning. IPA tends to harden adhesive making cleaning extremely difficult. BR, Pavel

Yamaha YV100 Feeders

Sep 14, 2006 | Thanks for the reply. I will try to clean this feeders. They all seem to be worn out and needs cleaning and adjustments. Peel tester could be another way for us of making sure our system goes more efficiently. This peeling problem usually occurs on big component or reels. So this could be valid

Solder Ball After Reflow Process

Aug 18, 2006 | Hi Russ, Can you please clarify on what you mean by "after wash they should be gone since it is water soluble,".....the flux would be water soluble or otherwise, how does that relate to solder balls being removed by cleaning?...i can see them being removed by the force of the cleaning chemistry

Hybrid flux: No-clean and WS

Jul 12, 2006 | Hybrid flux: No-clean and WS Hi everybody: I really need your expertise on this one. I was told that the flux 270WR from AIM is either No-clean or WS soluble depending on your needs. I read the TDS and it looks like it is....but..... Is there anybody out there using this or similar flux with those properties? I never heard

RoHS Conversion: Iron Tips

Jul 10, 2006 | Hello All, Has anyone tested the effectiveness of any process to remove lead from tinned soldering irons to RoHS acceptable levels? We have been dedicating new tips for RoHS assembly, but as our RoHS product line increases it will be important to know if we can "clean" tips of lead or if we need to chuck em all. Smell that fresh clean air. -OtheRuss

Low Flux Residue Solder Paste

Jun 14, 2006 | I'm looking for a No Clean low or an ultra low flux residue solderpaste (SAC305 and Sn/Pb). Any Recommendation? Is there something in the datasheet that will tell if a solder paste is really a low residues flux. Also is there a method to clean the fluxes off a low profile LGAs? Thanks in advance

Problems with SN100C in a Soltec Delta C Wave

Jun 14, 2006 | Yes it's definately possible to have too much flux. You'll see a white residue film on the board. In the past we have had hipot issues cause of too much flux residue ,left on the boards. You defininately don't want to be using a no clean flux and still have to clean boards kinda kills the whole

Defluxing Advanced Packages

fluid dispensing pumps for integration