Abstract: A printer apparatus comprising one or more printing elements arranged to print on print media located in a print position, the apparatus further comprising first and second media paths respectively adapted to feed media to and away from the print position, the apparatus being arranged to selectively divert a print media sheet from the second media path to the print position, the apparatus being arranged to implement a servicing routine comprising marking the diverted sheet with one or more of the printing elements.

Abstract: A printhead for a hardcopy apparatus is calibrated by a separate device before being installed in the hardcopy apparatus. The calibration information produced is stored in a memory located in the printhead, in the device, in the hardcopy apparatus or in an external device. A carriage and several printheads may be calibrated simultaneously.

Abstract: A printer apparatus comprising one or more printing elements arranged to print on print media located in a print position, the apparatus further comprising first and second media paths respectively adapted to feed media to and away from the print position, the apparatus being arranged to selectively divert a print media sheet from the second media path to the print position, the apparatus being arranged to implement a servicing routine comprising marking the diverted sheet with one or more of the printing elements.

Abstract: A printhead for a hardcopy apparatus is calibrated by a separate device before being installed in the hardcopy apparatus. The calibration information produced is stored in a memory located in the printhead, in the device, in the hardcopy apparatus or in an external device. A carriage and several printheads may be calibrated simultaneously.

Abstract: Precise alignment between two or more nozzle plates affixed to print cartridges installed in a single carriage of an ink printer is achieved by machining datum projections on each print cartridge after its nozzle plate has been permanently secured to the print cartridge. The machined datum projections on the print cartridge contact surfaces on the carriage when the print cartridge is installed in the carriage such that the dimensions of the datums affect the position of the cartridge, and hence the nozzle plate, within the carriage.

Abstract: An improved modular carriage assembly for an inkjet printer including: a carriage with at least two stalls molded therein for holding a plurality of inkjet pens; and a removable frame insertable in a compartment in the carriage adjacent to the stall for holding an electrical circuit. In a specific embodiment the improved modular carriage assembly includes at least two extensions molded onto the removable frame. When the removable frame is inserted into the compartment each of the extensions is inserted into a respective stall. A method of assembling a carriage assembly for an inkjet printer with inkjet pens includes the steps of: attaching an electrical circuit to a frame; positioning a unitary clamp on a carriage; and installing the frame with attached electrical circuit to the carriage. Installing the frame on the carriage holds the unitary clamp in place on the carriage.