I set up and ran the electrical tester where I
worked.
I'm familiar with evert Charles, mania testeria,
laviner and others,
but when you talk about post and donut and
Christmas tree
I'm not sure about that. Do they use the waffle
head probes
or the sharper pin probes?
We used 2-6 layer lexan or polycarbonate
fixtures.
so related to your question, I ran into some
similar
instances of this. We kept scratching our heads
because
the waffle heads would fail, but when we rang it
out with
a meter, it was connected. There was some solder
film
or some sort of other contaminates. We used a
scrubber
at the end with a chemical cleanser. All we could
figure
is someone skipped the clean cycle. There appeared
to
be a fine film of flux or some sort of
residue.
A good chemical clean cleared it right
up.
HTH
----- Original Message -----
Sent: Monday, October 13, 2003 12:16
PM
Subject: [TN] electrical testing.. ECT
9090
we are currently running into some problems with the our double
sided
e-test machine..
for the most part, everything runs
perfectly.. no problems whatsoever..
but, there are a few problem part
numbers that we cannot seem to get out
from under.
with these part
numbers, we have checked everything out on the machine, and
cannot find
anything that would make these parts different than any
other
parts.
the last thing i can think of is that there might be a
problem with our
fixture system. we currently use the post and donut
fixtures. at some
point, everett charles told us that it might be better to
use the
"christmas tree" type fixtures, so we ordered a set of those. not
enough to
switch over, but enough to test the setup.
the problem is,
when we run those sketchy parts, we end up with a ton of
opens that aren't
really there, and sometimes end up testing and retesting
to get a good
test.. when we manually probe the errors, they are in fact
false, but this
slows down the whole etest department to a complete stop..
my question
is.. does anyone have any experience with both types of
fixtures, and have
you found that the christmas tree types are more stable
than the post and
donut types?
any input is appreciated..
also.. one more
question.. has anyone come up with a set of criteria for
what makes the
decision of type of fixture to use?
thanks
again!
____
Sergio T. Ruiz
technology and MIS
Philway
Products, Inc.
(419) 281-7777
x232
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