While you wait for answers, we may have found some information which could help you.
Click here for Oven Model HeatSharp r-953 stopped working?
sharp R259 800w?
sharp convection microwave oven turns off after exactly 59 seconds. how to ?
Sharp Microwave oven Model R-330J(S) keypad problem?
Microwave, Sharp R 957 not heating?
my sharp r957 microwave not giving heat?