Observation:
V+ takes a couple of minutes to build up from Vin upon first application of input power. Once 5.15V is reached at V+, push button power on is possible.?
If the radio is powered down, a 6.5mA draw is maintained. ?Pressing the push button will not power up again until Vin is reset by removing power and the jack terminals shorted then waiting for V+ to rise above 5.15V again.?