Lexmark X940e Owners Manual

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Developer interlock plate assembly removal 
Warning:  Always perform color registration adjustment (RegCon) when removing or reinstalling the 
printhead, NVM initialization, or developer interlock plate assembly. See “” on page 4-264.
1. Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-3.
2. Remove the front left cover. See “Front left cover removal” on page 4-9.
3. Remove the waste toner cartridge cover. See...

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Warning:  Use extreme caution when disconnecting the next seven connectors from the upper harness 
strip, or damage will occur.
9. Disconnect the seven connectors from the upper harness strip.
10. Remove the six screws securing the developer interlock plate assembly (A) to the machine.
11. Remove the purple harness from the large black plastic clamp on the developer interlock plate assembly (A)
Warning:  Note the orientation of the four developer unit...

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13. While holding the four developer unit assemblies firmly inside the machine, gently remove the developer 
interlock plate assembly (A).
14. Remove the developer interlock plate assembly (A) and allow it to gently hang down by the harness if 
removing the developer units. If removing the developer interlock plate assembly (A) from the machine, 
goes to step 15.
15. Remove the screw securing the harness cover (B) to the machine.
16. Remove the harness...

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Replacement note:  When replacing the developer interlock plate assembly (A), install the bottom edge 
first and ensure that all four developer unit assemblies are properly aligned when replacing the developer 
interlock plate assembly (A).
Replacement warning:  Ensure that the erase lamp harnesses and developer unit assembly harnesses 
are correctly installed in the clamps, or they may become detached. Verify that the harnesses are properly 
secured in the...

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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...

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Warning:  Ensure that the harness coupler (B) is removed from the old developer unit assembly (A) and 
installed on the new one.
Note:  Installation of a new developer requires installation of the appropriate carrier. See page 4-70 for the 
instructions on how to install the new carrier.
Replacement warning:  Ensure that the rear area new developer unit assembly (A) is properly engaged 
into the machine or the magnetic rolls will not turn properly.
Use the...

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detached. Verify that the harnesses are properly secured in the clamps by moving the transfer belt lift 
handle up and down several times before reinstalling the inner cover.
11. Perform the ATC sensor setup and adjustment. See “Sensor (ATC) setup” on page 4-260.
12. Perform the color registration (RegCon) setup and adjustment. See “” on page 4-264. 
13. Remove the printhead cleaning tool from the printer front door assembly. 
Clamp Erase lamp &...

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14. Clean the four printhead glass windows using the printhead cleaning tool. 

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Developer carrier removal and replacement
Note:  The following procedure can be applied to the C, M, Y, and K developer carriers.
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 4-260.
Warning:  Always perform color registration adjustment (RegCon) when removing or reinstalling the 
printhead, developer unit assembly or developer interlock plate...

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11. Remove the top cover (A).
12. Completely remove the carrier (B) from the assembly by dumping it and using a toner vacuum or if installing 
a new developer unit assembly, go to next step.