'twas Austin American Technology

http://www.aat-corp.com/

> -----Original Message-----
> From: Timothy Reeves [SMTP:[log in to unmask]]
> Sent: Monday, July 09, 2001 9:33 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Bare board cleaning
>
> FYI Larry,
> ECD sold its cleaner division to a company in Texas a while back and no
> longer makes washers. That division was up in Milwaukie (Oregon) and we
> (the board shop) are down in Mulino, about 15 miles south, so I wasn't
> directly involved with washers. That's why I don't remember who bought the
> cleaner division.
>
> Timothy Reeves
> QA Manager/Process Engineer
> ECD Circuit Board Division
> 13626 S. Freeman Road
> Mulino, OR 97042
> Tel (503) 829-9108    Fax (503) 829-5482
>
> [log in to unmask] <outbind:[log in to unmask]>
>
> <http://www.pcbpro.com/>
>
>       -----Original Message-----
>       From: Larry J. Fisher [mailto:[log in to unmask]]
>       Sent: Friday, July 06, 2001 9:34 PM
>       Subject: Re: Bare board cleaning
>
>
>       1. Many board shops will do a final clean operation (typically a
> saponifying
>       heated detergent spray rinse, tap water and final DI water rinse),
> just prior
>       to the boards being packaged and shipped to the customer. This is
> done to
>       remove any contaminants that can arise from handling when the panels
> are
>       routed into boards,   electrically tested, etc.This is primarily
> done to make
>       sure the boards are clean when they leave the board shop, look good
> and will
>       meet ionic cleanliness requirements if a random sample is selected.
> You might
>       want to contact your board supplier(s) to see if the do this final
> clean
>       step. If so, you probably would not need a pre clean prior to
> assembling the
>       boards.
>
>       2. There are some assemblers that do use dish washer type machines
> to clean
>       fully assembled boards. In fact, ECD in Oregon makes a dish washer
> type
>       machine specifically for cleaning assembled boards. The down sides
> are that
>       the machines will only hold a few boards (no good for any kind of
> volume
>       production), the cycle time is quite long (up to 1 hour - similar to
> a dish
>       washer) and the assembled board is subjected to long exposure in a
> very high
>       temperature/high humidity environment. I would think the solvent
>       cleaning/vapor degreasing you are now using would be a better
> approach,
>       especially with the RMA solder pastes you are now using.
>
>       Hope this helps.
>
>       Larry Fisher
>
>       Allen Woods & Associates
>

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