1. Install the heater board. (Heater board Installation)
  2. Connect the Scanner/PCU Harness cable [A] to CN922 of the heater board [B] and clamp the harness.
  3. Attach the clamps around the controller board in the rear main unit.
  4. Route the heater cable to the rear of the main unit.
  5. Open the front cover.
  6. Open the right cover.
  7. Open the transfer unit [A].
  8. Remove the PCDU [A].
  9. Pull out the waste toner bottle [A] (x1).
  10. Take off the heater bracket [A].

  11. Attach the anti-condensation heater (PCU) [A] to the heater bracket [B].

    • Fit the anti-condensation heater (PCU) [A] into the tab [C] on the heater bracket [B].

  12. Attach the thermostat [A] to the anti-condensation heater (PCU) [B] (x1).

    • Fit the thermostat [A] into the tab [C] on the heater bracket [B].

  13. Put back the anti-condensation heater (PCU) [A], and then pass the heater harnesses out through the opening [B] at the inner rear side of the main unit.
  14. For MP 4055 SP, MP 5055 SP, and MP 6055 SP only: Remove the development bearing cooling fan [A].

  15. Connect the harnesses of the thermostat [A] and of the anti-condensation heater (PCU) [B] to the harnesses [C] which are routed in step 4.

    • You can connect the harnesses [C] up to either harness [A] or [B].

  16. Attach the warning decal on the bracket.
  17. Reattach the development bearing cooling fan, PCDU, waste toner bottle and covers which have been removed.