Reply To: Beocord 5000/4921 Tasten/Panel ohne Funktion

[Dillen]

Question is not why something works.
Question is why something doesn’t work.
In your case, – where things basically works when commanded from outside but not
from its own operation panel, there must be a problem getting the commands from the panel to the processor.

Most problems of this sort are caused by cables, connectors, solder joints and
stuck switches. However, the keyboard reading circuit could also be at fault.
If the display on the front panel is also garbled, perhaps some circuit shared by those
two functions should be looked at.

Martin