1. Open the front cover.
    IM 550F/600F/600SRF: Push the button [A] and open the front cover [B].

    P 800/801: Open the upper cover [A], and then open the front cover [B].
  2. Release the lock lever [A] by rotating it towards you, and then remove the toner cartridge [B].
  3. Pull out the PCDU [A].
  4. Release the hook, and then remove the container guide [A] by sliding it to the rear. (hook×1)
  5. Disconnect the connector.
  6. Release the hook [A] by pressing the lock lever, and then remove the development unit [B]. (hook×1)
After replacement of development unit:
  1. Execute SP3-900-001 to supply toner to the development unit.