To Reinstall: 1 Make sure that the Fuser Output sensor flag (figure 6-34, callout 3) on the upper left corner of the Fusing Assembly rotates freely. 2 Make sure that the lower levers are set down for single sheets. If the customer is having trouble printing envelopes, move the levers up. Move the levers back down when done. C4085-91087 Engine Removal and Replacement 199