Problem Display + solution

Who has the well-known problem that can be read off after a while no more data that can extent Endowed with manual skills the clock screw (4 hooks with a slot screwdriver). Thus, if the clock is then opened once just press times from below against the screen, now you should see something again. Who still has glue on hand, can solve the problem permanently ;-) On the subject of back-up battery I can not currently say much because the clock is still running without any problems and is actually loaded.

For processing: Grey-White plastic case a transparent cover of the buttons and little fiddly terminals, sits well on the DIN rail and fits well to the fuses. A German manual is also!