I have an old Magic Chef range oven that looks like this:

When the range oven is plugged in, the timer starts at 1:59. The timer beeps when that length of time has elapsed. I fiddled with the timer buttons and tried every possible configuration, but the only way to stop the timer is to 1) reset the timer to 1:59, or 2) unplug the range oven.
Is there any way to disable the timer permanently? Perhaps by taking it apart, or some other workaround?
A label on the oven door indicates a number of 8114p351-60, if that helps.