Since the two replies I received were from people using ultrasonic cleaners
I'm starting to think it's my cleaner with the problem more than the
printer. The wiper/vacuum system on the printer seems to work quite well.
Of course, we can't afford to replace the cleaner we have...
Thanks for the feedback.

> -----Original Message-----
> From: Lambert, Katherine A. [SMTP:[log in to unmask]]
> Sent: Monday, August 16, 1999 4:12 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Solder paste stencils
>
> We haven't had a problem with paste on the back of the stencil.  You may
> want to investigate your stencil printer to see why it isn't performing
> properly.  We have an ultrasonic stencil cleaner that seems to clean
> solder
> off stencils very easily with a 2 minute cycle.
>
> Kathie Lambert
> Process Engineer
> Northrop Grumman
> Baltimore, MD
>
>         -----Original Message-----
>         From:   Martin, Jesse [SMTP:[log in to unmask]]
>         Sent:   Monday, August 16, 1999 3:08 PM
>         To:     [log in to unmask]
>         Subject:        [TN] Solder paste stencils
>
>         Has anyone had a problem with solder paste stencils that have a
> build up of solder paste on the bottom (PCB) side of the stencil that
> won't
> come off in the stencil cleaner? I think what happens is the vacuum/paper
> wiper leaves some on the bottom after each wipe and the more it wipes the
> harder it is to get off. I can pop it off with an Xacto knife or the like
> but is very time consuming. Only other thing that works is using a
> Scotchbrite pad but that leaves a lot of scratches (which probably causes
> faster build up). Have also tried stainless steel cleaner with no luck. We
> use an old Austin American batch aqueous cleaner with saponifier at 120
> degrees F. Any and all ideas welcome.
>
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