Ricoh D197 Service Manual page 456

7. Lift up the development sleeve unit [A].

Do not touch or hold the development sleeve edge [A] when holding the sleeve unit.
Otherwise, it may cause an injury.
8. Remove the developer after turning the development unit upside down in the reverse
direction of the development filter.

Rotate the gear to remove as much toner as you can.
SM 4-83 D197/D198/D199/D200/D201/D202
PCDU