Lenovo C540 Touch All-in-One - Manual (Page 28)

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User Guide
Precautions when using the Touch Screen
1. When using the touch screen, be careful not to tear the surface with any sharp
objects.
2. To ensure normal use of the touch screen, ensure that both the screen surface
and your fingers are clean and dry.
3. To ensure precise positioning on the touch screen, avoid handling or touching
the glass frame when you are touching the screen.
4. Turn the computer off for safety before cleaning the screen and frame with a
soft cotton cloth. Do not wipe it with a wet cloth as this may leave a water mark
and affect touch operation.
5. Do not place or drop anything which could obstruct it in the four corners of
the screen or any part of its frame, because this could separate the screen
from the frame and stop the screen from being able to sense position properly.
Please avoid leaving water and dust in the gap between the casing and glass
when you are cleaning the frame.
6. Avoid using the touch screen in dusty environments or hot or humid conditions.
Any abrupt temperature change may cause condensation on the inside surface
of the glass screen, which will disappear after a short time and does not affect
normal use.
Note: The touch screen will not affect other computer processes when
used normally.