25 May 2010, 23:45
You can't be leisurely about the tapping; three taps must occur within 1.5 seconds, or you do not enter setting mode. You might also check to see if there is a little silver label on the back of the module [usually stuck to the quartz crystal]. 401=magnet set, 402=Auto-Set, 403=DOW, Auto-Set, 406=24HR display [Time Computer never put a 24-hr module in a Big Time or Classic, but I have one or two, probably replaced some time after it left the factory]. Finally, you could pull the module out of the case and look for a pair of switches on the left side [with module facing you]; those would be setting switches. Shorting across those with a pair of tweezers should activate setting functions even if the switches themselves are damaged [top switch for minutes, bottom for hours].