Sharp MX-C401 - Manual (Page 204)

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BEFORE USING THE MACHINE
Contents
(3) Brightness adjustment key
Touch this key to adjust the brightness of the touch
panel.
When touched, the following screen appears next to the
key.
Touch the [+] key or the [-] key to adjust the brightness.
When finished, touch the brightness adjustment key
again to close the screen.
This icon appears when the data security kit
is being used.
The icon appears when the machine is
communicating with an external application.