Ricoh B245-62 Service Training page 68

Toner Density Control 1 -- Overview
Toner density is
controlled by both TD
sensor and ID sensor.
Toner is supplied
when Vt is higher
than Vref.
Slide 68
There are four toner-density control modes set by SP 2921. However, SP 2921
should almost always be set to 0.
If the TD sensor needs to be replaced SP 2921 can be temporarily set to 3 (fixed
control 2).
SP 2921 should not be set to 1 or 2 in the field. (Design and production use only)
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B245-62 / PD-C4