Hitachi Koki DDS 50 Quick Reference Manual page 42

3. Tap a new toner bottle against a desk or other hard surface four
to five times. Then, turn the toner bottle upside down and tap it
in the same way again.
4. Shake the new toner bottle well, and turn it over lengthwise five
times.
.
5. With the UP marking on top, insert the bottle into position.
4-6 Maintenance