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my samsung er-150 cash register makes a high pitched alarm sound on switch ?

my samsung er-150 cash register makes a high pitched alarm sound on switch on. i have tried to reset it by holding down 'c' and '00' but it makes no difference. can anybody help?
Liezl Strydom, October 2017
Usually a faulty keyboard or printer

Registerman, December 2017
link Click here to see other fixes for Samsung.