Use the following procedure to start using the printer again after it has been inactive for a long period.
To avoid damage to the fusing unit's knobs, be sure to turn both knobs back to their original positions, as shown in the following procedure.
Plug in the power cable.
Pull Front Cover Open Lever, and then open the front cover with both hands carefully.
Lower the blue fusing unit lever.
Using a coin, turn both gray knobs on the fusing unit 90 degrees clockwise (until the slots are vertically aligned with the marking shown in the illustration below).
Close the front cover with both hands carefully.
Turn the power switch to On.