HP 1050c Service Manual - Page 288

Functional Overview Introduction This Chapter contains a simplified description of the HP DesignJet 1050C/1055CM Printer circuits and mechanical functions. Mechanical and printed Circuit Assembly (PCA) overviews present a functional description of how the Printer operates. HP DesignJet 1050C Printer The HP DesignJet 1050C will have a network interface, 16 MB of memory but will NOT include the Hard Disk Drive. HP DesignJet 1055CM printer The HP DesignJet 1055CM will have a network interface, 32 MB of memory and a 2.1 Gbytes Hard Disk Drive. It will also be Postscript ready. Electrical System The electrical system of the Printer consists of six major blocks and their associated cabling: n Power Supply Unit: Connected to the mains supply of whichever country this block provides 24V, 5V, 3.3V and -15V to the rest of the electrical system. It has a soft power switching feature allowing the firmware to control when power is removed from the system, and eliminates the need for high tension cables to the front panel. n Main Electronics: This block contains the I/O, central processing units and controls most of the motors and sensors in the printer. The motors and sensors themselves are located throughout the printer and are connected to the main electronics via cables. n Carriage: Connected to the printheads, this block supplies power to them, as well as monitoring and protecting them from damage. It also has the ability to control warming and to perform continuity checking, as well as controlling the line sensor. The carriage encoder is also located in this block. n Ink supply station: The Ink Supply Station is connected to the Ink Cartridge supplies, and controls air pressure (pump, sensor and valve), as well as monitoring ink levels and the supply latch 10-2 HP DesignJets 1050C and 1055CM Printers Service Manual