HP PageWide Managed P77740 Printhead Assembly Install Guide - Page 11

10.3 10.4 Use a small flat-blade screwdriver to carefully flex the corner of the lower front cover away from the printer chassis, this creates the required clearance for the printhead assembly to fully travel into the printer. Push down on the top of the printhead assembly, and then turn the manual wiper movement shaft clockwise to disengage the wiper engagement racks from the drive wheels. NOTE: If necessary, see step 10.1. Use a #20 TORX driver to turn the manual wiper movement shaft . 10.5 10.6 Continue to push down on the top of the printhead assembly, slightly slide it back into the printer, and then turn the manual wiper movement shaft counterclockwise to engage the wiper engagement racks with the drive wheels. NOTE: this step ensures that the assembly is installed correctly aligned in the chassis. With constant down pressure on the printhead assembly, continue to turn the manual wiper movement shaft counterclockwise to pull the assembly fully into the chassis. IMPORTANT: Down pressure on the assembly ensures that the engagement racks on the wiper do not ride up and over the drive wheels, which can cause the assembly to become misaligned in the printer. TIP: If the printhead assembly is about 10 mm (0.5 in) from being fully in and will not slide in any further, the mounting screws at the rear of the printer (PB4 and/or PB5) might be protruding into the printhead cavity. Use a magnetized screwdriver to pull them back out. 11