The only thing you can try is open the tape compartment as though you were going to insert a cassette then with the aid of a hairdryer on its low setting blow mildly hot air into the bottom left hand side of the opening (that is with the LCD side furthest away from you) for about 20 seconds or so, leave about another 30 seconds then repeat the hot air for a further 20 seconds. You could try it immediately after carrying out the procedure, but its always best to leave slightly over the hour as it can take that time for the memory to reset itself. More detailed info can only be supplied to a direct e-mail address as it involves a jpeg attachment for illustration purposes. (dew sensor position)