Ricoh Ch-C1 Series Service Training page 313

 After replacing the cleaning unit, attach the special tools [A] to
the OPC drum (these are shipped with the cleaning unit). With the
flange [C], rotate 1-2 times in the direction of the arrow [D].
 D137/D138: After you take the drum cleaning unit out of the
machine and put it back, or replace it with a new one, carry out
SP3-040-001 to SP3-040-005 (DEMS: Execute).
Slide 313
No additional notes
Replacement and Adjustment
Drum Cleaning Unit - 2
313
Ch-C1 Training