Hi Julien
 I too have seen this problem but it sounds like your case is worse what
ours was.
 We had a couple of methods of getting around this. One was an occasional
cover up with a permanent black marker, we were also successful in teaching
a dull fiducial to the screen printer, there was not allot of contrast but
it worked.
 If the epoxy went completely thought the stencil and fell out than we would
fill the hole with more epoxy. I can't remember what kind of epoxy we used
but there was nothing special about it.

Trevor Goddard,
SMT Supervisor
XLTEK
(905) 829-5300 x 348
[log in to unmask] <mailto:[log in to unmask]>




-----Original Message-----
From: Julien Bouchard [mailto:[log in to unmask]]
Sent: Tuesday, December 12, 2000 11:25 AM
To: [log in to unmask]
Subject: [TN] Repair of fiducial fill material


Hi everybody,
        We recently start to use an ultrasonic stencil cleaners for our
stencils.
It' work well, but after some time, we saw a lot of fiducial that the black
epoxy have been partially or totaly remove.  I want to know if someone had a
similar problem with a stencil cleaner. Also, we looking for a material to
repair the black epoxy of the fiducial ( for now we use ink pen, but we need
to redo the job everytime we change of product). Our stencil are from UTZ
and our stencil cleaner is from SMART-SONIC.  Thank you.




Julien Bouchard
Matrox - Process Engineer
Email : [log in to unmask]

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