|
Printer and Photocopier Troubleshooting and Repair Collection : Toner sensors?
Copyright ©
1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.
|
<< Problems with Ricoh copie.. |
Index
| Comments on copier cleanl.. >>
|
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.
My wild guess would be that the frequency changes with low toner or something
like that.
(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.