Jenway 3540 - Manual (Page 19)

To change the brightness of the display press the down arrow to highlight the LCD
Brightness (%) option in the Instrument Set Up screen, then press the Enter key. The
highlight will move across to the percentage previously set (or the default value of
050). A data entry box will appear in the centre of the screen. The box around the
least significant digit will be flashing to indicate that this digit can be changed by
pressing the up or down arrow keys.
Data entry box for adjusting display brightness
When this is set to the desired value the right or left arrow keys can be used to move
the flashing highlight to the other digits which in turn can be adjusted to the desired
levels with the up or down arrow keys. When all digits are set to the desired levels
press the Enter key to confirm the setting and return the highlight to the left-hand side
of the menu. Use the Escape key to return to other menu levels or continue with
setting the Language as above.
Should a value above the maximum (100%) be selected, then when the Enter key is
Warning that value entered is outside limits
pressed a warning message is displayed and the setting automatically corrected to
the maximum level permitted.