My Casio No. 2471 watch Battery was just changed now I can not change modes and the date area say's open.
I had the same problem.. there are 2 tiny springs that need to contact the contact strip on the plastic cover that goes over the battery. These short out the circuit removing the OPEN note and returning the module to normal operation.. I was not careful enough and lost one of the springs. Thats whats happened with yours... a spring is missing..
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