HP 2425 - Manual (Page 42)

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4 Distribute the toner in the cartridge.
Hold the cartridge with both hands, and gently rock it from side-
to-side five or six times to distribute the toner.
5 Remove the tape seal.
Holding the cartridge in place with one hand, use your other hand
to grasp the orange tab on the right side of the tape seal. Pull the
orange tab straight out, and then discard both the orange tab and
the tape seal. If the ring breaks off from the tape, pull the tape by
its end.
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