■Lock functions
The lock function electronically locks keys and switches to prevent accidental changes and function access from the mi- crophone.
•All keys, switches and controllers on the transceiver are functional.
■Display backlighting
The function display and switches can be backlit for better visibility under low light conditions. And the backlighting con- dition can be adjusted independently from the transceiver.
ïActivating the lock function
➥While pushing and holding [H/L], push [SQL] to turn the lock function ON and OFF.
•“ 
” appears.
•Only [PWR], [PTT], [H/L], [SQL•MONI], [VOL]+[Y]/[Z] and [SQL]+[Y]/[Z] are functional.
Appears when the lock function is in use.
qPush and hold [VOL•DIM] for 1 sec. to enter backlight ad- justing mode.
•“
” with number of backlight level appears in the channel name indicator.
wPush [Y]/[Z] to adjust the backlight level.
•The backlight level is adjustable between 0 (lights OFF) and 3 (brightest).
■Monitor function
ïActivating the all key lock function
➥While pushing and holding [H/L], turn the power ON by pushing [PWR] to turn the all key lock function ON and OFF.
•“ 
” flashes.
•Only [PWR] and [PTT] are func- tional.
Flashes when the all lock function is in use.
The monitor function releases the noise squelch mute of the microphone only. (An independent noise squelch system is employed.)
➥Push and hold [SQL•MONI] for 1 sec. to activate the mon- itor function.
•“ 
” flashes and audio is emitted.
•Any key, except [Y]/[Z], cancels the monitor function.
34
