I have an older Icom PS15 power supply. I understand that when you use it
with a 706 which I am using, or any of the newer radios designed for it,
it
should not turn on until the on button on the radio is pushed. This one,
when used with the 706, seems to turn on when it is connected to the radio
whether the on button is pushed or not. The light comes on and it is
running
as soon as the power cable is connected to the radio. Is this normal with
this radio? I may try my 746 and see what happens with it as well. Could
there be a component in the supply that has gone bad causing this? When I
first got the supply, there was a switch added to it to turn it on/off
manually. Perhaps this is why it was added. I took the switch out and
returned it to the original configuration according to the schematic. Any
input would be much appreciated. Mike, K7MH.

The 706 does not have a true on/off switch as such. The power is connected
all the time and the on/off switch only turns a switching circuit off and on
sort of like the way the ATX computers power supplies work. Several of the
newer rigs are this way.