I took one of those apart and found something that looked like a piezo
element with 3 wire connections to concentric rings. I looks to me like
some sort of resonator but I have not attempted to analyze the circuit.
|Printer and Photocopier Troubleshooting and Repair Collection : Toner sensors?
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My wild guess would be that the frequency changes with low toner or something
(From: Morton Lee Cohen (cx163@FreeNet.Carleton.CA).)
Probably the disks stir the toner for even dispersion, and break a photogate
to tell the controller PCB that there is toner there. Some Cannon laser
printers/photocopiers use magnetic sensing of the toner level. Most Okidatas
use the photogate sensors with magnetic toner agitators.