MX-C300P, MX-C300PE, MX-C300PL. Service Manual (Revised May 2016). - Sharp Copying Equipment Service Manual (repair manual). Page 126

MX-C300P  MAINTENANCE  9 – 7

 (Note1)  Clean the developing material when the developing material is on

the DV side label as shown in the figure. (F/R both side) 
* When installing, the remaining developing material could damage
the drum unit.  

 (Note2)  Clean the developing material when the developing material is on

the DV blade as shown in the figure. (F/R both side) 
* When installing, the remaining developing material could damage
the drum unit. 

 (Note3)When the Developing material had migrated to the end of the seal,

rotate the Developer MG Roller while tilting the DV Unit 45 degrees
to re attract the Developer back to the MG Roller. (F/R both side)     
* When installing the DV Unit with Developer on the seal, the drum
unit can become damaged.

 (Note4) Connect the connector of the developing unit firmly. 

* When the connector is not connected correctly, the developing
adjustment error occurs.  

7) Execute SIM24-5 to clear the developing unit counters. 

Then, execute SIM25-2 to adjust the developing unit automatically.