Turn the printer off and unplug the printer. If the printer has
been running allow the fuser to cool for 30 minutes before replacing.
Open the rear cover and remove the two screws circled below.
Lift the fuser slightly (a few millimeters) while
pulling straight back to clear the two small nipples located next
to the two screws you just removed. Pull the fuser straight out
to prevent the sensor lever on the right side of the fuser from
catching in the printer.
Side note: before installing the
replecement fuser, be aware that some laserjet 4, 4 plus, and 5
fusers have pressure release levers. These need to be in the down
position in order for the fuser to work properly. These levers are
completely unnecessary so don't worry if your fuser doesn't have
them. Click here to
see the correct position.
Insert the replacement fuser and tighten the two screws.
If the display panel reads 50 FUSER ERROR, CYCLE POWER,
turn the printer off for 15 minutes. This allows the capacitor that
is responsible for signaling this error to discharge. If you don't
wait 15 minutes you will continue to get this error even if you
have replaced the fuser.
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