Ricoh Ch-C1 Series Service Training page 317

 When carrying the developing unit, do not hold the frame [A]. The
frame may become bent or broken if load is applied to it.
 D137/D138: After you take this part 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 317
No additional notes
Replacement and Adjustment
Removing the Development Unit - 2
317
Ch-C1 Training