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How can I fix my JCM Gold G-211?

The cash register due to problematic handling by my relatives has lost the program for adding.....o_0 Is there a way to fix this? If not, how do I reboot the system?
NZ Dweller, January 2010
I'm using the model of cash register, but the key pad can't work properly after I replace the cartridge. For example, when I type 155 and press cash tend, the number shows on the receipte is 044, can you please tell why does it happened?

Jacky, February 2011
Mark, If I just had my battery replaced and it had been working perfectly, but also due to someone fiddling around with the programming, I need to reprogram, how do I do that?

Ester, May 2010
There was no battery;;; is it because it's a plug-in one?

NZ Dweller, January 2010
Hi. It usually means the battery has failed. You need to replace the internal rechargeable battery, then get back to me for more information.

Mark, January 2010
link Click here to see other fixes for JCM.