6 – 5
Chapter 6 Principles of Operation
In the cleaning step, the remaining toner is removed from the drum surface. The drum
surface is prepared for the next cycle.
The toner is scraped off the drum surface by a cleaning blade.
The toner scraped off in the cleaning step is collected in a recovery toner
compartment partitioned from unused toner.
The transfer rate is normally more than 90%, but varies according to the image
coverage range and environmental conditions such as temperature and humidity.
The used toner cannot be reused. When the printing step is started, the whole
drum surface is scanned with a laser beam. If charges generated in the previous
step remain on the drum surface, they are completely removed. When the
continuous printing step is started and finished, a negative high voltage is applied
to the BTR. If toner particles adhere to the BTR in the previous printing step, the
toner particles are returned to the drum surface. In this way, the surface of the BTR
is cleaned.
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