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Check for a "Stuck" or worn out button on the front panel. It's just a rubber membrane that will jam or wear out over time. Check your buttons on the remote as well. Beyond that, it would need to be on a service bench to tell exactly where the problem lies. Hope this helps
Hello, You may want to buy the service manual (SM) from Pioneer for this unit. It has a lot of info on resetting and testing the receiver under the "Test Mode". It is highly improbable that you could ruin the firmware by connecting the receiver in an unusual way. You may just need to reset it to factory specs. Another option if you bought it from a local Pioneer dealer is for them to reset. It usually involves getting into the secret menu to do so. I had one of these for a short while and they are quite nice receiver.
I had the same thing with mine. After a couple of weeks in the local repair shop, it was determined that the main? in-put chip on the back of the front panel was bad. Had it replace for about $125 out the door and it's been working great since.