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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.
Cartridge-life detection
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The DC controller detects the cartridge life. The DC controller determines cartridge end-of-life and
notifies the formatter when the toner out.
Other image-formation functions
Drum discharge
The drum discharge is a feature to remove residual charge on the photosensitive drum surface for
preventing uneven image density. The laser-beam strikes the surface of the photosensitive drum to
remove the residual charge.
The drum discharge is performed during the LSTR period.
Figure 1-22
Transfer roller cleaning
The transfer roller cleaning is a feature to remove residual toner on the transfer roller surface to prevent
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
Drum discharge
Photosensitive drum
Laser beam
Image-formation system
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Troubleshooting
