Kenwood ProTalkXLS TK-3230 - Manual (Page 49)

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You can set the display backlight to remain off, remain on, or
turn on when you press any key other than the PTT switch
(auto). When set to auto, the backlight remains on for 5
seconds after pressing a key, before turning off again.
To select the backlight setting:
 With the transceiver power OFF, press and hold the
MENU (for approximately 1 second) key while turning the
transceiver power ON.
 Press the or key to select “ ”.
 Press the MENU key then press or to select “ ”
(backlight off), “ ” (backlight on), or “ ” (backlight
auto).
 Press the MENU key to exit the selection.
 Press the PTT, MON, or CAL key to exit Setting Mode.