1. Remove the development unit. (Development Unit)
  2. Remove the controller box. (Controller Box)
  3. Open the harness alignment film [A] by releasing two square holes [B] [C] from the hooks.

  4. Disconnect two connectors ([A]: YC2016 and [B]: YC2017) from the main/engine PCB (PCB1).

  5. Release the harnesses from the harness guide [C].

  6. When removing the laser unit (CY), open the film [A] after removing the connector YC2017.

  7. Pull the harness [A] into the main unit from the opening [B].
    When removing the laser unit (KM):

    When removing the laser unit (CY):

  8. Remove the drum heater (K, M, C and Y), if installed.

    1. Disconnect the connector (b) of the drum relay PCB (PCB22) (a).

    2. Lift up the machine left side of the drum heater (a) to remove the pin (b) from the boss.

    3. Slide the boss (b) at the machine right side of the drum heater (a) to remove it.


    Like this, remove four drum heaters (a).

  9. Remove each set of three pins (a).

  10. Detach the laser units (b) for KM and CY.

    Pull out the harness from the opening and remove it.

  11. Check the laser unit and clean or replace it if necessary.

  12. Reattach the parts in the original position.

  13. Execute the following after replacing with the new laser unit.
    System Menu
    [Adjustment/Maintenance]
    1. Executes Color adjustment (Color Calibration).
    2. Execute the Color Registration.

    Secure the pins in order of A, B and C when reattaching the laser unit.

    • Make sure to return the spiral (b) to the lock position after relocating it to reattach the pin (a) that is in the position A.
    • Make sure not to touch the LDB (PCB12/PCB14/PCB16/PCB18) (b) when holding the laser unit (a).
    • Pull the harness (b) out from the aperture (c) of the frame when reattaching the laser unit (a). There is an engraving (d) of an arrow indicating the opening position in the frame.
    • Be careful not to locate the saddle clamp (b) on the pin protrusion (c) before reattaching the laser unit (a).