R&S SMT03 - no front keys working

[Mlemc]

Hi there, anyone familiar with Rohde&Schwarz front panel keys which aren't working?
I tried cleaning the flat cable and connectors but no result. Unit starts normally and other knobs (brightness, selector) are working.

Internal battery is 3,6Vdc so seems normal.

Issue popped up after power loss.

[Jarek]

Hi
Sometimes one or several key contacts are dirty and shorted and the keyboard does not work.
Try to clean the contacts of all keys (silicon pads and tracks).
You need to separate them and wash them gently with IPA.