31 PANEL DESCRIPTION■ Programmable function keysThe following functions can be assigned to [UP], [DOWN],[P0], [P1], [P2], [P3] and [P4] programmable function keys.Consult your Icom dealer or system operator for details con-cerning your transceivers programming.INFORMATION:Depending on the pre-setting, the [A], [B], [C] and [D]keys on the optional HM-152T dtmf microphone operatethe same as the functions which are programmed to the[P0], [P1], [P2] and [P3] keys on the transceiver, respec-tively. Ask your dealer for details.CH UP AND DOWN KEYS➥ Push to select an operating channel.➥ Push to select a transmit code channel after pushing [TXCode CH Select].➥ Push to select a DTMF channel after pushing [DTMF Au-todial].➥ Push to select a scan group after pushing and holding[Scan A Start/Stop]/[Scan B Start/Stop] for 1 sec.ZONE KEYPush this key, then select the desired zone using [CH Up]/[CH Down].What is “zone”?— Selected channels are assigned to azone according to how they are to be used in a group.For example, ‘Staff A’ and ‘Staff B’ are assigned into a“Business” zone, and ‘John’ and ‘Cindy’ are assigned into a“Private” zone.ZONE UP AND DOWN KEYSPush to select an operating zone.SCAN KEY➥ Push to start and cancel scanning operation.• When Power ON Scan function is activated, push to pause thescanning operation. And the paused scan restarts after thespecified time period has passed.➥ Push and hold this key for 1 sec. to indicate the scan list,then push [CH Up] or [CH Down] to select the desired list.