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How to fix 1E-03 error in my NX-5400F?

My NX-5400F electronic cash register shows 1E-03 error on tue screen once I key in an item, how can I sort this out?
Thuli, April 2017
You could read the manual. You'll see IE-03 is "Clerk not signed on"

Manual turned up with a 30 second Goggle search:

http://www.uniwell.co.uk/images/pictures/operator-manuals/nx5400-02-operation-manual.pdf - Page 84

acp, April 2017