You might try to "reset" the 5011 back to factory settings.
8.1 Resetting to factory settings
Follow the steps below to reset your preamp to the factory settings:
1. Switch the preamp off.
2. Press and keep pressed the fourth button on the right side of the display.
3. Holding the button pressed, switch the preamp on. The display will remain dark.
4. Release the button.
5. Switch the preamp off.
6. Wait five seconds.
7. Switch the preamp on.
Factory settings: Out1 and out2 on, CD1, maximal display brightness
8.1 Resetting to factory settings
Follow the steps below to reset your preamp to the factory settings:
1. Switch the preamp off.
2. Press and keep pressed the fourth button on the right side of the display.
3. Holding the button pressed, switch the preamp on. The display will remain dark.
4. Release the button.
5. Switch the preamp off.
6. Wait five seconds.
7. Switch the preamp on.
Factory settings: Out1 and out2 on, CD1, maximal display brightness