Your comments about ultrasonics has got me thinking- I am looking for a new
stencil cleaner that would also be used for cleaning misprinted boards. I am
using water-soluble paste. The stencil cleaners I see on the market today
all seem to employ ultrasonics. Since many of our boards use crystals,
oscillators, etc., I am concerned about subjecting them to ultrasonics if I
have to clean a misprint on side 2 of the board after side 1 is completed. I
am wondering what others in a similar situation are using as a
stencil/misprint cleaner for water-soluble.


Bob


Robert Barr
Manufacturing Engineering
Formation, Inc.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Thursday, May 03, 2001 2:43 AM
To: [log in to unmask]
Subject: Re: [TN] Unusual Cleaning Operation- Help!


Brian wrote: (snipped)

Ultrasonics: before adopting ultrasonics in production, check the
reliability of cleaned assemblies. There are some components that don't
like them at all. Especially ceramic-cased semiconductors, quartz
crystals, some multilayer ceramic capacitors etc. The problem is that
they may not cause the component to fail in the immediate but to weaken
it so that it fails prematurely after a number of
days/weeks/months/years of service.

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