indoor grill temp regulator broken?

Question

I have a Hamilton Beach/Proctor Silex indoor grill model #25265. A couple of weeks ago it was left on too long and the thermal fuse blew. I found and replaced the fuse, but noticed the unit was grilling at maximum temperature whether the temperature regulator was at low, medium or high. Now the fuse blew again. I will replace the fuse again, but would like to know how I can fix the temperature regulator. My friend told me I will have to measure the voltage of various resistors, but without a wiring schematic the mathematics will be quite complex. Hamilton Beach refused to provide me the wiring schematic. I have no idea how it broke, but how can I fix the temperature regulator?

Answer 1

Cant they direct you to a repair center?
?

Answer 2

is it really worth the trouble just buy a new one