HP 450c Service Manual - Page 186

Servicing the Cartridges Service Station D The service station is easy to access and remove, and is replaceable as one unit. D The absence of a drop detector implies a different cartridgeĆmaintenance algorithm to guarantee correct nozzle conditions. The Printer warms the nozzles and spits ink: D Before each plot. D After each cartridge change. D While printing, depending on: cartridge, humidity, temperature, and plot ink density. D The ventilation holes, which were located on the serviceĆstation sled on the DesignJet 650C, are now located on the ink separator to prevent them from becoming clogged. Spittoon A single, redesigned spittoon is located on the right side of the Printer. Primer The Printers feature a manual primer, based on that of the DeskJet 1200, instead of the automatic one of the DesignJet 650C. D A bellows assembly provides a vacuum to suck ink from the nozzles. The suction tubes have a wider diameter than those of the DesignJet 650C, to help prevent clogging. D An ink separator isolates the bellows from the cartridges, preventing ink contamination of the bellows. Although the primers for the DesignJets 430, 450C and 455CA and DesignJets 230 and 250C look identical, their characteristics are different. Installing the incorrect primer can damage the cartridges or reduce the servicing of the cartridges. For the correct part numbers for the primers ' chapter 7. 10-6 HP DesignJet 430, 450C and 455CA Printers Functional Overview