FLEX-6400/FLEX-6600 Hardware Reference Manual
Page 18 of 45
Copyright 2018 FlexRadio Systems. All Rights Reserved.
The power control is a “soft power control” that performs multiple functions depending
on the state of the radio. If the radio is powered off, momentarily pressing and releasing
the button will start the radio software. The radio takes approximately sixty seconds to
become fully functional.
Momentarily pressing and releasing the button when the radio is running will start an
orderly shutdown of the radio software. When the button is pressed, the button will
slowly flash green. At the conclusion of the shutdown, the button will either turn off or
turn solid amber if a GPSDO is installed. A full shutdown can take up to 10 seconds. It is
advisable to allow the radio to shut down in this way. During a shutdown, the radio will
save its settings, so ending the shutdown early by removing power from the radio may
cause a loss of settings.
Avoid removing power from the radio when it is performing a software update (power
button is solid purple). Doing so may result in the radio becoming unresponsive.
Holding the power button down for 4+ seconds while the radio is running will trigger an
immediate shutdown. This skips the database writing procedure, so any changes will not
be saved. This is not a recommended shutdown procedure for regular use.
Reset Procedure
With the radio powered off, press and hold down the power button for approximately 5
seconds until the Power LED flashes white, then release the power button. The radio will
start and will set all of its internal settings to their default values.
Error Conditions
Certain hardware and software error conditions cause the radio to stop operating and
display an error code by flashing the Power button light as follows:
• One red flash: Fan malfunction
• Two red flashes: Software crash
• Three red flashes: Boot failure
• Four red flashes: Input power over voltage
• Five red flashes: CPU overcurrent
• Six red flashes: Input power under voltage
In the case of a software crash, the error code repeats for about 15 seconds, then the
radio will reboot. In the other cases, the error code repeats until the Power button is
pressed, then the radio shuts down. An additional press of the Power button is needed to
restart the radio.
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