Sharp MX-M550U Service Manual page 354

a. Developer
1) Take out the developing tank. (See "(1) Developing unit")
2) Remove the DV cover.
3) Turning the MG roller, take out the old developer.
4) Insert the new developer.
b. DV seal
1) Take out the developing tank. (See "(1) Developing unit")
2) Take out the old DV seal.
3) Wipe the sealing face with alcohol.
4) Affix the new DV seal at the reference position.
c. MG holder F and R
1)
2)
3)
4)
5)
6)
MX-M700N DEVELOPING SECTION L – 3
Take out the developing tank. (See "(1) Developing unit")
Remove the DV cover. (See "a. Developer")
Remove the doctor cover.
Remove the DV cover front.
Remove the bias line and main pole position adjusting plate
and screws.
Remove the MG gear and screws.