While you wait for answers, we may have found some information which could help you.
Click here for Change Register Manualolympia cm 1810 plus locked?
how do i change the time on olympia 721 cash register?
olympia CM 812 ?
Where can I source a spindle for an Olympia CM1810+ cash register?
how to set time and date on olympia CM726?
How can I change the date on a Olympia S2200 cash register?