Hey, I was getting this, and maybe it was spurred by the 1403 code (incorrect printhead)... but all I did was soaked a rag in alcohol and wiped everything down on the inside of the machine, on the right side mainly. There appears to be a "waste spong...
What worked for me was soaking a rag in alcohol and wiping down all around inside near where the printhead rests on the right. Be careful to avoid the "encoder stripe" which is 1/4" wide, up above it in the back. It has little black lines on a clear ...
