Repair information 4-53
5057-XXX
Developer unit assembly removal
Note: The following procedure can be applied to the C, M, Y, and K developer unit assemblies.
Warning: When removing developer unit assemblies, ensure that the area on the floor in front of the machine
is protected from toner spillage.
Warning: When replacing the developer unit assemblies, ensure that all toner spillage and contamination is
removed.
Warning: Always perform the sensor (ATC sensor) setup and adjustment if required or print quality problems
may occur. Go to “Sensor (ATC) setup” on page 4-210.
Warning: Always perform color registration adjustment (RegCon) when removing or reinstalling the printhead,
developer unit assembly or developer interlock plate assembly or print quality problems may occur. Go to
“Color registration (RegCon)” on page 4-214.
1. Remove the transfer belt unit assembly. See “Transfer belt unit assembly removal” on page 4-16.
2. Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-3.
3. Remove the front left cover. See “Front left cover removal” on page 4-9.
4. Remove the waste toner cartridge cover. See “Waste toner cartridge cover removal” on page 4-39.
5. Remove the waste toner cartridge sensor assembly. See “Waste toner cartridge sensor assembly removal”
on page 4-39.
Note: The waste toner cartridge sensor assembly does not need to be removed from the machine. It may be
allowed to hang by the wires.
6. Remove the inner cover. See “Inner cover removal” on page 4-42.
Warning: When removing the CMY toner add assemblies, the toner cartridges should be left installed in order
to reduce toner spillage.
7. Remove the three CMY toner add assemblies. See “CMY toner add assembly removal” on page 4-46.
Warning: When removing the K toner add assembly, the toner cartridge should be left installed in order to
reduce toner spillage.
8. Remove the K toner add assembly. See “K toner add assembly removal” on page 4-48.
9. Remove the developer interlock plate assembly. See “Developer interlock plate assembly removal” on
page 4-48.
Note: When removing the developer assembly, position it in the way it is removed from the machine, or toner
spill will occur.
10. Ensure that the transfer belt lift handle is in the down position and gently remove the appropriate developer
assembly (A).
Note: When removing the developer assembly, ensure that it is positioned in the same manner in which it is
removed from the machine or spillage will occur.
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