CP 3525 and CM3530 series printers lacking error code As most stepper motors in HP printers will display error codes if not functioning properly, (59.XY error) the CP3525 and CM3530 printer series have been known to have a faulty pick up motor and only display a 13.3 paper jam (no paper movement) when trying to print from tray 2 or manual input tray.   Figure 1       This can be verified by opening the right door and defeating the door open switch (fig 1) to watch for the pick up gears to turn,(fig 2) if not, the RM1-4975 pick up motor assembly need to be replaced.   Figure 2     *This Tech Tip is contributed by Laser Pros. Visit their website www.LaserPros.com or email any question to marketing@laserpros.com.