Hello Larry

We used the ultrasonic equipment, similar stencil cleaner. My doubt is what product use to clean the PCB? Is alcohol isopropyl correct?
After the cleaner we dried before use in my printer again.

Thank you

Juliano


De: Larry Dzaugis [mailto:[log in to unmask]]
Enviada em: quarta-feira, 24 de agosto de 2011 15:14
Para: TechNet E-Mail Forum; Juliano Ribeiro
Assunto: Re: [TN] Misprinting Boards

Simply wiping the PCB clean will result in solder balls in the vias that will come out to play when you go through re flow.

Equipment similar to a stencil cleaner is used. They come in all shapes and sizes and methods of cleaning and chemistry. It depends on your assemblies and what they are used for. The PCB must be dry before it goes back into production. Don't contaminate the board wth dirty cleaning solution. This is for bare boards.
Boards populated on one side with a mis print have more conditions. My lines run no clean flux, as a result no one pays attention if the part is not sealed. Many inductors on my assemblies have dust caps that would fill up with cleaning solution and not drain. Therefore the boards are scrapped for misprints with bridges. PCA's with missing solder or insufficient solder are reprinted. I was not able to justify the purchase of any significant equipment due to the total value of scrapped mis printed PCB's.
It was better to scrap.

Populated boards can be cleaned to remove the solder paste.
The type of components, size, customer requirements will determine what you can use.



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