HP 2425 - Manual (Page 68)

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WARNING! Turn off the printer, unplug the power cord, disconnect
any interface cables, and make sure that the fusing unit has cooled
down before cleaning.
ACHTUNG! Schalten Sie vor der Reinigung bitte den Drucker aus,
ziehen den Netzstecker heraus und entfernen alle Kabel von den
Schnittstellenanschlüssen, bis die Fixiereinheit abgekühlt ist.
To maintain clear, crisp print quality, and to help prevent paper jams,
clean the registration roller area (around the guide lock plate tray)
after replacing a toner cartridge, or when necessary. Use the follow-
ing procedure:
1 Open the top cover and remove the toner cartridge.
» Note: If you plan to reinstall the toner cartridge, put it back in its
aluminum bag or a desk drawer, or cover it with a thick cloth while
cleaning the interior of the printer. The toner cartridge can be
damaged by exposure to light.