"Says "Paper Jam" but no jam is present."に関する回答Get a can of compressed air and blow out the paper path areas. This fixed mine, after it ocured to me that maybe dust or small debris was setting the paper jam sensor off,
"paper and ink lights both flash together"に関する回答Blow out the paper feed area with a can of compressed air. This fixed mine after I was in panic mode. There must have been dust or some small, unseen debris setting the sensor off. Hope this works for you.