[1000mp] Mark V Field - Main and Sub receivers dead

[MG]

Hi to everybody.
As subject I have this trouble:
both receivers, on all bands, are without signals; only white noise.
It has happened yesterday morning suddenly, after 2 QSO's from the 
switching on of the transceiver.
I have found this on web:
http://www.va3cr.net/markv/Troubleshooting/RXDead.htm
It seems like W7HV trouble on his Mark V, although mine is a Mark V Field.
I have not opened the rig yet, I am looking up block and schematic 
diagrams for now :-)
Do you have more suggestions?
Thanks for your replies.

73
Maurizio, ik4omu