HP 4550 Service Manual - Page 89
Printer maintenance, Lower the toner access cover and close the printer's top cover. - error 54 2
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4 4 Make sure that the tab on the other end of the toner cartridge aligns with the notch on the cartridge slot. Note If the tab does not fit in the notch when you insert the toner cartridge, the toner is the wrong color for that cartridge slot. 5 Slide the toner cartridge down into the slot until the cartridge stops. 5 6 Rotate the toner cartridge toward the back of the printer (within the cartridge slot) until the cartridge stops. The cartridge shutter opens to reveal the developer sleeve. 7 Lower the toner access cover and close the printer's top cover. Note You must close the top cover before installing another toner cartridge. 6 CAUTION If you need to ship the printer, remove the toner cartridges and imaging drum before shipping. Note If you receive a 54.2 error, see page 233 for more information. 7 C7085-90921 Chapter 4 Printer maintenance 87