Hi, Justin here.
It's very peculiar piece of a text. I could read it because I speak Korean as my native language.
I didn't do word by word translation because that won't make any sense.
오동작코드 오동작 내용 / (대책)
malfunction code malfunction / (solution)
E-1 쎈서주변이 너무 밝을 경우 - in case the places near the sensor is too bright
E-2 (주변의 직사광선을 피해 주십시요) - (please avoid direct sunlight around the sensor)
E-3 쎈서표면이 더러워진 경우 - in case the sensor's surface (or cover) has become dirty
E-4 (쎈서표면을 가볍게 닦아 주십시요) - (please lightly clean the surface of the sensor)
E-5 계수중(?) 지폐가 걸릴 경우 - in case paper money gets stuck while putting it in
E-6 (지폐를 다시 세트시켜 주십시요) - (please reset your paper money)
E-9 건전지가 전부 소모된 경우 - in case the battery has run out
(건전지를 교환해 주십시요) - (please replace the battery)
I feel like these are instructions for fixing a vending machine or something.
Hope this helps