HP Laserjet Q5421A Manuel D'installation page 8

Replace the paper in the 1,500-sheet
feeder and close the door.
NOTE Depending upon which optional
accessories are installed, you might not need
all of the feed rollers included in this kit.
WARNING! The fuser might be hot. Make
sure that the printer has been turned off for
30 minutes before removing the fuser.
Locate the blue fuser release levers on each
side of the fuser. Pinch the blue levers
upward and pull the fuser straight out of the
printer.
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To replace the fuser:
CAUTION When replacing the fuser, the
must be turned off for 30 minutes to
printer
allow the fuser to cool down.
Open the rear output bin and pull the
extension outward until it stops.
Remove the fuser from its protective bag.
8
Remove the rear output bin and extension
by pushing the left-side hinge toward the
right-side of the printer until the hinge clears
the mounting hole in the printer chassis.
Rotate the left side of the output bin and
extension away from the printer and remove
the output bin and extension.
Push the new fuser firmly into the printer
until the blue levers on both sides click into
place.