KaVo 2052 CHC Instructions For Use Manual page 25

Operation
CAUTION
Removing and attaching the contra-angle handpiece while the drive motor
is rotating.
Damage to the drive.
▶ Never attach or remove the contra-angle handpiece while the drive
motor is rotating!
CAUTION
Damage
If the footswitch is pressed while you are connecting and removing the
medical device, you can damage the medical device and motor coupling.
▶ Do not connect or remove the medical device while pressing the
footswitch.
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