Dryer timers control all the functions of the dryer. When the dryer turns off, how long the heater is on and how long the cool down cycle is, etc.
As you can see from the picture above dryer timers have small motors on the back. The motor rotates gears and cams that open and close switch contacts that control the loads in your dryer. A load is something that does work like a motor, heater, light bulb or end of the cycle buzzer.
When the timer is manufactured the amount of time each set of contacts will be closed is built in by the timer cams and gears. Service manuals contain a timer sequence chart that have a matrix indicating how long each contact will be closed during a cycle. Technicians use multimeters to measure for voltage across timer contacts. And only the timer sequence chart will tell when a particular set of contacts will be open or closed.
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