280ZX digital clock won't set.

[Xnke]

So I got the clock working again after changing a few electrolytic caps in the power supply board. Now, the clock will let you put it in set mode, and you can set the hours...but then you can't get it to hold that setting while you set the minutes, or vice versa. Same with the stopwatch or lap timer.

 

If I wait till midnight and reset the time on the clock, it keeps perfect time. But I just can't set the clock or use any of the functions, without wiping out the time or whatever I've got on the display.

 

Anyone know how to set this damn thing??? Not even Google helped me this time.