Disabling a mailing machine when a print head is not installed

摘要

Mailing machine including a controller, a printer module including a connector, a print head controller for producing print data signals necessary to print a postal indicia on an envelope and a replaceable print head cartridge having a plurality of print elements which are selectively energizable in response to the print data signals. The print head cartridge is detachably mounted to the connector. The controller in operative communication with the printer module for: determining if a valid print head cartridge is installed; and if a valid print head cartridge is not installed, preventing the print data signals from reaching the connector. <IMAGE>