Next the plastic piece circled in red below needs to be unclipped.
(Some of the older LaserJet 4000's do not unclip, see the second
picture.) The picture below is of a LaserJet 4100 which is easier
to photograph, but uses mostly the same parts. The removal procedure
is the same on a LaserJet 4050 and newer revisions of the LaserJet
4000. Simply pull up at the three points circled in yellow where
the plastic piece snaps on the shaft.
For older revisions of the LaserJet 4000 the platic
piece pictured above does not unclip. You need to bend the plastic
up in order to slide the two black discs to the left. You need to
use a little muscle to lift the plastic up, but it's the only way
to slide the two discs to the left. Now you can get at the separation
pad.
The separation pad assembly is the same for the LaserJet
4000, 4050, and 4100. To remove simply take a small flat head screwdriver
and pop out the plastic arms circled below. This will free the separation
pad. Remove it and be careful not to lose the springs.
Insert the new separation pad, slide one of the black
disks all the way to the right, install the pickup roller, slide
the second black disc all the way back to the right, and follow
the reverse procedures to re-assemble everything.
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