86  Troubleshooting
When your radio won’t turn on
If the red, green and amber LEDs on the control head do 
not light up when the radio is turned on, it is probable 
that power is not reaching the radio. Check the 
following:
■ Is the power connector firmly plugged into the rear 
of the radio?
■ Are the in-line fuses in good condition?
■ Is the power cable securely connected to the vehicle 
battery or power supply?
If all appears to be in order, but your radio still fails to 
operate properly, contact your radio provider for further 
assistance.
Identifying the radio’s audible tones
The radio’s audible tones can help you identify a 
potential problem: 
Audible tone Meaning
One short, high-
pitched beep
The radio has been made inoperable 
(‘stunned’ or ‘inhibited’) by your service 
provider.
Two short beeps The radio has been made operable 
(‘revived’ or ‘uninhibited’) by your service 
provider.
Two low-pitched 
beeps
The radio’s temperature is high. (The radio 
will continue to operate.)
Two high-pitched 
beeps
The radio’s temperature is in the very high 
range and all calls will now be at low 
power. If the radio’s temperature rises 
above this range, calls will be inhibited. 
Turn off the radio and allow it to cool 
down.