IC-7760 frequency expansion; MARS mod

After the first investigation concerning the frequency modification the main question was whether the diode matrix is in the RF unit or in the control unit…
It is in the control unit and consists of 24 diodes. The picture shows the EUR version without any modification. As it is complicated to access the diodes by detaching all the connectors it would be this time quite difficult to desolder/solder every single diode and attach all the connectors again in order to test the functionality after every step. If you know exactly which one it is, it is of course possible doing it once. But not 16 times… At least not today 😉