Unplug the igniter and check for 120V coming to the igniter with the Bake on.
If there is 120V, then replace the igniter.
If there is no 120V, then replace the thermostat.
- The part number for the igniter
AP205873
- The part number for the thermostat
AP379270
Here are the break down diagrams for the Magic Chef oven
Model 9122XUB
Gene.