HP 4550 Service Manual - Page 111
Waste toner cleaning, Waste toner cleaning operation
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Waste toner cleaning The waste toner cleaning process begins when residual toner from the ITB is transferred to the photosensitive drum. The toner is then transferred to the waste toner reservoir. Waste toner cleaning operation Although most of the toner is transferred from the ITB, some residual toner remains. The ITB cleaning roller moves into position and places a positive charge on the residual toner. When the residual toner reaches the drum, it is transferred to the drum's surface by the drum's negative charge. The residual toner is then transferred from the ITB to the drum. This waste toner is then removed from the drum's surface by a cleaning blade, collected by the sweeper strip, and placed in the waste toner reservoir by the waste toner transfer plates. . Figure 5-9 ITB residual toner cleaning Figure 5-10 Waste toner to waste toner reservoir C7085-90921 Chapter 5 Theory of operation 109