Sharp PN-70HC1E Operation Manual page 42

Troubleshooting
The response of the touch panel is slow.
Some parts of the screen do not respond.
A different place is touched.
• Is the screen exposed to direct sunlight or other strong
light? The touch panel uses infrared rays and thus may not
operate correctly.
• Is there an obstacle between the infrared transmitter/
receiver and the touch pen or your finger? An obstacle will
prevent correct operation. If your fingers or a sleeve are too
close to the screen, correct operation will not be possible.
• Is the infrared transmitter/receiver dirty? Gently wipe off
any dirt with a soft cloth.
• If the touch panel is touched with a small tip less than about
5/16 inch (8 mm) x 5/16 inch (8 mm), the touch may not
be detected by infrared and correct operation will not take
place.
• When starting your computer or connecting the USB cable,
do not touch the touch panel. If you touch the touch panel,
this may be detected as an element failure in the infrared
transmitter/receiver and incorrect operation will result.
The monitor makes a cracking sound.
• You may occasionally hear a cracking sound from the
monitor. This happens when the cabinet slightly expands
and contracts according to change in temperature. This
does not affect the monitor's performance.
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