We may have found other answers which could help you.
Click here for Cleaned Some Wont
How to fix brand new Royal 9170 cash register power fail?
How to program a Royal 500dx Electronic Cash Register?
royal 480nt?
How do I fix my royal 480nt cash register?
printing receipts out of whack on royal 500dx?
why won't my royal 582cx won't print on the receipt paper?