HP LaserJet M9040M9050 Multifunction Printer series - Manual (Page 125)

3. Adjust the guides to touch the envelope stack without bending the envelopes. Make sure that the
envelopes fit under the tabs on the guides.
Figure 7-16 Load envelopes in tray 1 (3 of 3)
4. Change the fuser levers (see Change the fuser levers on page 111 ).
Change the fuser levers
1. Move the output device away from the MFP to gain access to the left door.
Figure 7-17 Change the fuser levers (1 of 4)
2. Open the left door.
Figure 7-18 Change the fuser levers (2 of 4)
WARNING! Avoid touching the adjacent fusing area. It can be hot.
ENWW Print on envelopes 111