HP 20/700 - Manual (Page 131)

130 Manual Operation Chapter 4
3. Hold the solenoid on top of the reach mechanism with one hand and
grasp the cartridge with the other. Rotate the solenoid switch clockwise
until the cartridge is released from the gripper, as shown in Figure 36 on
page 129.
Caution Potential equipment damage: Make sure the gripper mechanism
is fully retracted. If it is left extended and you turn the robot, the
gripper mechanism will strike a storage cell. If it is left extended
and the hand is facing the tape library door when it is closed,
the door will strike the gripper mechanism.
4. Push the gripper mechanism back into the hand until the mechanism is
fully retracted.