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Yamaha RX-A1020, sounds after 5-10 minutes after switching on

The issue of my AV-Receiver Yamaha RX-A1020 is, that it sounds after 5-10 minutes after switching on.
On display is also shown "Decoder OFF", it doesn´t matter, wich input is selected.
Afterwards it works. To solve this problem, I need that service manuel.

Did anyone has a similar problem and solved it?