Open the front covers.
Pull open the tray until it stops.
Remove any paper in the tray.
Remove the 2 screws.
Push the tray in while lifting its front part slightly, disengage the lock, and then detach the tray.
Push the guide rail back into the machine.
Remove the paper feed roller in the following order:
(1) Snap ring and pick-up roller
(2) Snap ring and feed roller
(3) Snap ring and separation roller
Attach the new paper feed roller in the following order:
(1) Separation roller and snap ring
(2) Feed roller and snap ring
(3) Pick-up roller and snap ring
Pull out the guide rails.
Engage the tray with the guide rails' thread holes.
Secure the tray with the 2 screws.
Push the tray back into the machine.
Close the front covers.
Reset the counter for replaceable parts.
Do not turn the machine on until you have read how to do so.