Ricoh D009 Service Manual page 468

System SP Table-2
Charge Counter
Set the number of pages to print after toner and carrier initialization before
the charge input is increased to compensate for deterioration over time in
2980*
the polarity of the carrier.
The strength in the polarity of the carrier in the toner will eventually
decrease and cause lower charge output. Setting the charge output to
increase after a specified number of copies can compensate for this effect.
D009/D011/D012/D013/D091/D092
[0 to 1000000 / 0 / 1 sheets ]
4-36 SM Appendix