[Alinco] More help on a 605...

[Eric Lemmon]

Ray,

>From the symptoms you describe, I suspect that PIN diode D5 is shorted. 
It is one critical component that can easily self-destruct, since the
forward resistance increases as it gets hot, causing it drop more
voltage and thus dissipate more power- a vicious circle.  The dinky heat
sink on the back of the radio cannot remove the heat from the RF module
fast enough at high power, leading to component failure.  Consider
yourself very lucky that the RF module didn't go south.  This radio
really needs a fan!

A good test is to unsolder and remove D5, then turn on the radio to see
if the receiver now works.  Once you find and fix the problem, think
about cutting back the high power setting to 35 or 40 watts, just so
that it is not running at redline.  You might also use a Bird meter to
ensure that your antenna is properly matched to the radio.  The RF
modules used in the DR-605T and many other transceivers are prone to
overheating with a mismatched load, and such modules are seldom a true
50-ohm source.

73, Eric Lemmon WB6FLY