On Mon, 08 Aug 2011 09:39:32 -0400 "Michael A. Terrell"
wrote in Message id:
:

The only failed optical encoders I've seen either had a failed
incandescent lamp (Very early type of encoder).

And what a pain in the butt to get to on a 6034A! I wish I could find a
"side firing" LED that would not only fit in that little slot, but also be
the right wavelength for it to work correctly. I've experimented a bit
with this, but never been successful.