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I have a geller fx-400 cash register?

It powers up but when I press any button I get an E 0.0 error and nothing happens or works
Dotscar, February 2019
If it has a sign on system, make sure you have logged on to make sales. Otherwise it could be memory loss - especially if the battery hasn't been changed on time. I know of a manual for it which might help:

https://the-checkout-tech.com/manuals/cashregisters/Towa_FX-400_and_Geller_FX-400_operating_and_programming_manual.html

Registerman, March 2019
link Click here to see other fixes for Geller FX-400.