Oce WP28 Operation Manual page 139

Toner Container Replacement
4
Take the new toner container from the bag.
5
With the label side down, thoroughly shake the toner container (in
the direction of the arrows) ten times or more. This ensures that the
toner is evenly distributed inside.
10 times or
more
6
Carefully remove the protective seal (orange colored).
7
Install the toner container into the printer.
New Toner Container
3-4
Protective Seal