HP 4550 Service Manual - Page 207

Note Paper pick rollers To remove the paper pick rollers Remove Tray 2. Determine which version of the printer you are working with, and follow the instructions provided below, for the appropriate version of the printer. For 4500 series printer serial numbers xxG or lower The paper pick roller shaft is held in place with two white plastic clips. Pull the paper pick roller shaft down until it releases from the two plastic clips shown in callout 1, Figure 6-70. For 4500 series printer serial numbers xxH or higher and 4550 series printrs The paper pick roller shaft is held in place with two black plastic clips. Do not remove the roller shaft unless you have to replace it. To replace the individual pick rollers, rotate the shaft by hand so that the flat parts of the D-shaped rollers are facing up. Grasping the center of the D-shaped roller with one hand, press down on the roller clip on the flat portion of the roller with the other hand and pull it off of the shaft. If you need to remove the entire shaft, insert a small flat-blade screwdriver into both of the plastic clips (as shown in callout 2, Figure 6-70) to remove the roller. 2 1 Figure 6-70 Paper pick rollers removal and replacement Paper pick roller replacement tip When reinstalling the roller shaft, make sure that the flat parts of the D-shaped rollers are facing down. C7085-90921 Chapter 6 Removal and replacement 205