My infrared printer started doing this after I plug it in:
"This" is black horizontal lines that head leaves when it moves. Several clean lines are when i tried to press "feed line" button -- in this case printer moves the head and head leaves the trail. After some time this went away and I managed to print a few lines normally, but it returned after I turned it off and then back on. Printer is working off AC adapter, battery terminals are heavily damaged, I cannot use it with batteries.
Is it known failure mode and can I fix it?