Audio Systems: Nissan Altima Radio, antenna, nissan altima, radio antenna

Question
My 94 Nissan Altima radio no longer holds my station presets.  Every time I turn the engine off, the presets disappear, even if I reset them.  Also, the antenna does not go up and down. The dashboard clock,open-door chimes and "overdrive off" light also do not work.  Are these separate or related problems?  

Answer
this are related problems they are all missing constant power
power that don't need the key on the ignition the clock the momorys and the door chime nedd power all the time to work
there is a fuse box in the engine compartment the fuse is call
backup or memory  or constant
after the fuse is change  everything will work again

it is also the fuse of the cigarret ligther check to see if you don't have a penni or coin inside