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How to fix my uniwell nx-5400 cash register?

i opened my cash register to blow it out and clean the print head
and i plug it back on power and now it does not display anything while key is on sp or other positions. is it the flexi that goes from print head that is damaged or wat could be the problem?
Mister, February 2016
link Click here to see other fixes for Uniwell NX-5400.