HP PageWide XL 4500 User Guide - Page 76
CAUTION, Printhead status, Missing, Replace, Reseat
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The printheads are extremely durable and do not need to be replaced every time an ink cartridge is replaced. They provide excellent results even when the ink cartridges contain a low level of ink. To maintain optimum print quality, the printheads are automatically tested at regular intervals, and automatically serviced when necessary. This takes a little time and can occasionally delay printing. When a printhead eventually needs to be replaced, the front panel will display a message. The printer's paper-loading system includes an auto-indexing facility: whenever paper is loaded, the printer moves the position of the roll to compensate for printhead nozzle usage and extend the lifetime of each printhead. This is an automatic behavior, but you may notice that the front and rear rolls change position slightly between rolls. CAUTION: Do not touch the printhead nozzles. CAUTION: Do not put the printhead down on any surface for any reason. TIP: Printheads are best preserved inside the printer. Moreover, if you remove the printheads, the printer will need to be recalibrated whenever you put them back. Therefore you are recommended not to remove them unnecessarily. Printhead status ● OK: The printhead is working normally. ● Missing: No printhead is detected in the slot. ● Replace: The printhead has been identified as faulty. It should be replaced by a new or working printhead. ● Reseat: The printhead has been identified as faulty, but removing and reinserting it may perhaps solve the problem. 70 Chapter 3 Ink system ENWW