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PTM 2-61 B070/B071
Toner Hopper Empty Detection
The toner hopper sensor [A] detects whether there is enough toner in the toner
hopper. The toner hopper sensor checks for toner once when the toner supply roller
clutch turns on. When there is only a small amount of toner inside the toner hopper
and pressure on the toner hopper sensor becomes low, the toner hopper sensor
outputs a pulse signal (once per copy). Then the toner bank mechanism supplies
more toner to the toner hopper, as explained in previous sections.
Spring [B] applies development bias from the developer rollers to the lower case of the
developer unit , to prevent toner from being re-attracted back to the drum.
A294D307.WMF
[A]
[B]