Sharp IQ-8900 - Manual (Page 3)

Open
Press the lock button and
open the unit.
To remove the touch pen,
which is installed at the front
right of the unit, pull in the
direction indicated.
To replace the touch pen,
slowly push the pen point
back into place (push in the
opposite direction to that
indicated), then check the
pen is safely secured.
Take to ensure the
ridge grip on the touch
pen aligns correctly with
the mounting slot.
Caution:
Use only the attached touch pen to operate with the
display.
Do not use a pencil or any other sharp pointed object,
and always keep the point of the touch pen and the
display clean, to prevent scratching and damage to the
display.
The display can be adjusted
to any angle to make reading
easy.