Main Board Assy (EM-C800 Series)

Adjustment / 調整

When replacing this part, you need to run the menu from the service support mode before replacing it.

  1. Remove the four screws, then remove the Rear Cover (Back) (A).
    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
    Assembly / 組み立て

    Attach the two dowels of the Rear Cover (Back) (A) to the positioning holes on the Housing Left (B) and Housing Right (C).
  2. Remove the two screws, then remove the Rear Top Cover (A).
    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
  3. Open the ADF/SCN Unit and remove the three screws that secure the Housing Left (A).
    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
  4. Lift the Housing Left (A) to release the two hooks on the front side of the Housing Left.
  5. Disengage two hooks on the rear side of the Housing Left (A), and remove the Housing Left (A).


    Assembly / 組み立て

    Insert the eight tabs on the Housing Left (A) to the positioning holes of the Housing Upper (B) and the RIPS Unit (C).
  6. Disengage the hook, and remove the Maintenance Box Cover (A).
  7. Open the ADF/SCN Unit and remove the four screws that secure the Housing Right (A).
    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
  8. Lift the Housing Right to release the two hooks on the front side of the Housing Right, then remove the Housing Right.


    Assembly / 組み立て

    Insert the four tabs of the Housing Right (A) to the positioning holes on the Ink Supply Unit.
  9. Remove the six screws, then remove the Housing Upper (A).
    • : C.B.P-TITE-SCREW-3x10-F/ZN-3C
  10. Remove the two pieces of acetate tape (A), and disconnect the cable (C) from CN100 connector on the Main Board (B).


  11. Release the cable (B) from the two guides and the clamp (A).


  12. Release the cable (B) from the protective sheet (A) by opening the sheet in the direction of the arrow.

    Assembly / 組み立て

    Insert the two tabs of the protective sheet (A) into the two slits respectively.
  13. Disconnect the ground wire (A), and while pushing the connector’s tab upward, disconnect the cable (C) from CN799 connector on the Main Board (B).


  14. Open the ADF/SCN Unit (A).
    Caution / 注意
    • If you remove or attach the ADF/SCN Unit while it is closed, the hinge may be damaged.
  15. Remove the two screws and remove the ADF/SCN Unit (A) in the direction of the arrow.

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C


    Assembly / 組み立て
    • Before screwing the ADF/SCN Unit, make sure the hinges are properly attached in place.

    • If the ADF/SCN Unit is opened when the hinges are NOT secured, the unit may be damaged.
  16. Remove the screw and then remove the Hinge Assy (Left) (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
  17. Remove the three screws, and remove the Hinge Lower Cover (Left) (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
  18. Remove the two screws securing the Cable Guide (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
    Check Point / チェックポイント

    When removing the screws, if the screwdriver interferes with the ADF/SCN Unit, use a stubby screwdriver.
  19. Peel off the CRCM FFC (B) from the CRCM FFC Sheet (A).
  20. Peel off the double-sided tape at two locations and then remove the CRCM FFC Sheet (A).
  21. Disconnect the cables (B) from the connector (CN20, CN51, CN56) of the Relay Board (A).
  22. Remove the acetate tape (A), and release the cable (B) from the two guides.
  23. Disconnect the two cables (B) from the connectors (CN74, CN80) of the Main Board (A).
  24. Remove the two screws, and release the ground wire (A) from the slit to remove it.
    • : C.B.S-TITE-SCREW-3x6-F.ZN-3C
    Assembly / 組み立て

    Attach the ground wire with the terminal (A) oriented as shown below.
  25. Move the Cable Guide as shown below.
  26. Remove the two screws, then remove the PS Ground Plate (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
    • : C.B.S-TITE-SCREW-3x6-F.ZN-3C
    Assembly / 組み立て

    Assemble ensuring that screw types are correct.
  27. Disconnect the FFCs (A) and cables (B) from the connectors (CN2, CN9, CN51, CN43, CN55, CN609) on the Main Board.
  28. Disconnect the FFCs (A) and cable (B) from the connectors (CN3, CN67, CN66, CN68, CN41, CN8) on the Main Board.


    Check Point / チェックポイント

    Release the connector (CN41) on the Main Board by lowering the connector lock in the direction of the arrow.
  29. Disconnect the cables (A) from the connector (CN33, CN802) on the Main Board.
  30. Disconnect the FFCs (A) and cables (B) from the connectors (CN50, CN52, CN72, CN73, CN75, CN77) on the Main Board.
  31. Remove the two pieces of double-sided tape for the FAX FFC (B) from the MB Shield Plate Upper (A), and remove the ferrite core (C) from the FAX FFC (B).
  32. Release the PE Sensor Cable (B) from the clamp (A).
  33. Peel off the double-sided tape of the Relay FFC (B) from the MB Shield Plate Upper (A).
  34. Release the CR motor cable (B) from two clamps (A).
  35. Remove the five screws securing the Main Board Assy (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C
    • : C.B.S-TITE.P4.SCREW-3X8-F.ZN-3
  36. Remove the screws securing the Main Board Assy (A).

    • : C.B.P-TITE-SCREW-3x10-F.ZN-3C

    • : C.B.S-TITE-SCREW-3x6-F.ZN-3C

    Caution / 注意

    In the next step, be careful not to damage the PF Scale.
  37. Disengage the hole of the Main Board Assy from the hook of the CR Guide Frame, then remove the Main Board Assy upward.


    Assembly / 組み立て

    Affix the FFC (B) to connect to the Main Board Assy (A) connector (CN52) using double-sided tape at the positions in the figure below.

Adjustment / 調整

After replacing this part, you need to manually run the menu from the Service Support Mode.

(If the Inspection Mode starts automatically, start the Service Support Mode from the power off state.)