AR-M620 (serv.man16). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual). Page 19

AR-M550/M620  DETAILS OF EACH SECTION  6 - 78

1) Open the front door.

2) Open the process cover.

3) Open the left door.

4) Remove the MC charger unit.

5) Remove the blue screw.

6) Unfix the drum to remove the bearing.

7) Pull out the process unit by clasping the bolt head.

1) Disconnect the connectors.

2) Remove the blue screw to open the lower frame. 

3) Gently remove the drum, guide and all.

4) Remove the guide.

The OPC layer of a certain area of the OPC drum may break off due to
rotational friction. The OPC layer break-off generated in the area
shown below will not affect print images. Therefore, the drum can be
used without replacement.

12mm

14mm