yup, try putting the zone wire from say zone 5 into zone 6 in the clock,probably not the problem,most likely just a solenoid,hopfully not a cut wire though.
if you get an autoranging multimeter this will tell you everything you could ever need to know 99% of the time,wheather its the clock not getting voltage,not sending voltage,partial wire connection,open line or cut wire,bad solenoid. pretty much everything.