So my conclusion was: OK the 'computer' part works fine, the display and all indicators are working, but the 'radio' part is unresponsive.

The receivers seemed to receive normally, but were stuck on on a random frequency. The behaviour was as follows: No Audio, no AF gain response, no relays switching the bandpass filters, the Digi-Sel relays which normally rattling while tuning the VFO are unresponsive. I took a closer look to the behaviour, trying to 'reasoning' to the fault. I tried anything: 'All clear' reset, re-flash Firmware 2.11 etc. Being more a computer than a radio, this could be something 'software related' and I rebooted the rig. Suddenly the rig did not response to the AF gain knobs. My guess is they encountered the problem described below.ДЄfter 3 days, I collected my rig, and tested it at home. They had some 'trouble' but I did not ask for specifics. I spoke with Amcom after they completed the update. In my opinion, they did a pretty good job, upgrading this fairly complex and expensive rig.

In total there where about 16 minor modifications, and a few more intensive modifications, including replacement of the receivers. I made an appointment with Amcom, our Icom importer here in the Netherlands, and they did the work on all the modifications, prescribed by Icom. 2' with the upgraded roofing filters, and tons of other modifications. Being one of the first IC-7800's from the production line, it needed updating to 'Rev. IC-7800 Flat Cable Fault Icom IC-7800 Flat Cable Fault by Richard Rosenberger PA7FAДЄ few months ago, I obtained my dream: an Icom IC-7800 for a reasonable price.

Replace ic-7800 power supply