Ricoh BR-C1a Basic Service Training page 257

 Before reassembling the unit, apply a 1:1 mixture of yellow
toner and setting powder to the brush roller.
 [A] shows the minimum amount that should be applied,
and [B] the maximum amount.
Slide 257
No additional notes
Replacement and Adjustment
Servicing the Drum Cleaning Unit - 3
257
BR-C1 Training