HP laserjet m712 Fehlerbehebungsanleitung

The DC controller detects the remaining toner level in a cartridge according to the TONER LEVEL

signal. The DC controller determines a cartridge low warning or cartridge end of life when the

toner level drops below a specified level and notifies the formatter.

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Cartridge-life detection

The DC controller detects the cartridge life of components that wear out. The DC controller

determines a cartridge end of life and notifies the formatter.

The drum discharge is a feature to remove residual charge on the photosensitive drum surface for

preventing the uneven image density. The laser-beam strikes the surface of the photosensitive drum to

remove the residual charge.

The drum discharge is performed during LSTR period.

  Drum discharge

Laser beam

Photosensitive drum

The transfer roller cleaning is a feature to remove residual toner on the transfer roller surface for

preventing the back side toner stain of the paper.

The residual toner reverse transfers to the photosensitive drum by applying the reverse transfer bias to

the transfer roller. The residual toner is deposited in the toner collection box.

ENWW

Image-formation system

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