Ricoh SP 8400DN Field Service Manual page 1407

7.Detailed Descriptions
1.5% Coverage (Toner consumption ratio = 5 mg/m)
In this example, we have a lot less than 3% coverage. 1.5% coverage is only 5 mg/m of toner. The development
unit sends 5 mg/m of toner to the drum. 4.25 mg/m of this gets on the paper, and 0.75 mg/m is cleaned off the
drum and sent to the waste toner bottle (this is the 15% factor we talked about above). In this job, only 4.25 mg/m
was consumed. The machine has to consume 10 mg/m for each job. So, to make this 4.25 up to 10 mg/m for the
preceding job, the machine then consumes 5 mg/m by making patterns on the drum (shown in red in the diagram).
This toner is cleaned off the drum and sent to the waste toner bottle.
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Red letters indicate the toner amount that the belt patterns forcibly consume.
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