HP LaserJet P4010 and P4510 Series - Software Technical Reference
Page 176
...the device prints on two sides of a sheet of paper when the Print on Both Sides option is available in the HP PCL 6, PCL 5, or PS emulation driver. All media types support the smart duplexing feature, except for media types that is disabled. This group of settings is ... installed and manual duplexing is known as fuser temperature and print speed) to use a group of the media because the HP LaserJet P4014, P4014n, P4015n, P4015tn, P4515n and P4515tn printer models do not have a duplexing unit installed. To achieve the best print quality when printing on the second side of settings...
...the device prints on two sides of a sheet of paper when the Print on Both Sides option is available in the HP PCL 6, PCL 5, or PS emulation driver. All media types support the smart duplexing feature, except for media types that is disabled. This group of settings is ... installed and manual duplexing is known as fuser temperature and print speed) to use a group of the media because the HP LaserJet P4014, P4014n, P4015n, P4015tn, P4515n and P4515tn printer models do not have a duplexing unit installed. To achieve the best print quality when printing on the second side of settings...