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How can I fix a JCM Gold 223 Cash register bleeping ?

When I try to use the X or Z reading with the appropriate key, the machine just bleeps. Does anyone know a simple fix?
Malcolm Howarth, March 2016
Hard to find info for those now. Great machine but I don't have my notes anymore. You could try Checkout tech. They are the only ones I know of with manuals for the 223:

https://the-checkout-tech.com/manuals/cashregisters/JCM_G-223_2in1_owners_programming_and_initial_setup_manual.html

Registerman, March 2016
link Click here to see other fixes for JCM.