Hi,
The buttons along the lower edge of the front side are considered the primary keyboard and the set on the “operation panel” are known as the secondary keyboard in the B&O service manual. Was the unit shipped or transported in order to get to you? I ask because I once purchased a unit that was shipped in the original packaging but arrived with a dead secondary keyboard. Everything else worked fine including the remote. It turned out that the connector plug from the secondary keyboard had become dislodged from the PCB. Once I plugged it back in, it worked just fine. Unfortunately, it does require some disassembly, but the service manual describes all the steps and it’s relatively straightforward. Hopefully that’s all that’s wrong with yours too.
Bill