A device and method for ionization control is provided. The device and method controls the ionization balance using a sensor element, a control circuit that produces output signal as a function of an input signal from the sensor and transmits that output signal to the ionizer being controlled. The device also has a mechanism for detecting rapid changes in the input signal and a mechanism for disabling changes in the control signal for the duration of presence of said rapidly-changing signal.

 
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< Assembly of filtering apparatus and replaceable filter; and filtering apparatus and filter for use therein

< Conjunctival monitor

> Rotating flicker bar for cleaning a rotating cleaner roll and for transmitting power to the cleaner roll

> Color image forming apparatus, and toner replenishing apparatus

~ 00230