Sony C9000 service manual Toner Low Detection

2.10Toner Low Detection

•Structure

This device consists of the stirring gear which revolves at a constant speed, the stirring bar, and the magnet on the stirring bar. The stirring bar turns in synchronization with the protrusion of the stirring gear.

Stirring gear Link Stirring bar

•Detection

A toner low condition is detected by measuring the contact time between the sensor lever magnet and the stirring bar.

Toner low sensor

Sensor lever A

Toner Full Condition

•The stirring bar turns in synchronization with the stirring gear.

•Since the opposite side is in toner, the stirring bar turns by the force of the stirring gear even when the stirring magnet is placed in its highest position.

Toner Low Condition

•The stirring bar reaches its highest position, then falls to its lowest position under its own weight because of the absence of toner resistance on the opposite side. In this situation, bar-magnet con- tact time becomes long. By measuring the time, a toner low condition can be detected.

Sensor lever B

Toner cartridge

Stirring bar

Toner low sensor

Sensor lever A

Sensor lever B

Toner cartridge

Stirring bar

41388601TH Rev.2 35 /