HP LaserJet 5100 Mode D'emploi page 14

Step 2 Replace the Tray 1 pickup roller
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Figure 6 Removing the Tray 1 pickup roller
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Installing the printer maintenance kit
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Facing the front of the printer, lift the green center handle of the
registration assembly.
Lift the locking tab (Figure 6, item 1) on the right side roller cam,
and slide the cam to the right.
Slide the roller between the two cams, and then remove the roller
from the shaft.
Complete "Replace the Tray 1 separation pad" on page 13 before
installing the new Tray 1 pickup roller.
ENWW