On Sat, 29 Aug 2009 11:53:54 -0700 (PDT), "
wrote:

:I have an alarm board with two shorted surface mount diodes. These are
:about the size of a quarter watt carbon resistor only just a slight
:bit fatter. They are marked: MX6AA and MX50AA. Can anyone please
:identify these for me? Thanks, Lenny.


Are they glass MELF style or moulded plastic similar to either of these photos?
http://img.alibaba.com/photo/1078070...001_LL4007.jpg
http://product-image.tradeindia.com/...SMD-Diodes.jpg

My first guess would be 1W zeners so perhaps you can check to see if they have
6V and 50V ratings respectively (assuming they are not dead).