magic chef power sweep washer
 

The soap dispenser does not open during the normal wash cycle.

Here are the parts includes a wiring diagram
Model DU6500B

Here is a service manual
http://www.servicematters.com/maytag...s/16008775.pdf

Could be either mechanical or electrical
If it looks OK Mechanically then measure the wax motor for continuity.
Could be it is burned out, really it is just a small heater that melts the wax.