Your Owner's manual infers there may be a fuse in the device.
Check that out.
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5.2 Troubleshooting
Some putative defects are often caused by mistakes in operation. Sometimes other units connected to the amplifier can cause problems. We therefore kindly ask you to read the following tips before consulting your dealer or us.
1. No playback
a) Mute function is active, press button MUTE on your remote control or increase the volume using the rotary encoder (14).
b) Inadvertent switching to stand by. Press power button (1). If the LED indicator and display do not light up a fuse can be blown due to overvoltage (e.g. in case of a thunderstorm etc.). Please contact your dealer.