About a month ago, one of the paper feed motor went to the inverse direction. For me is not a strange issue, since a had the Frontier 370 this happened every year, mostly when I have a lot of prints to do.
An electrical technician friend of mine change the four step motor drivers from PDC20 circuit board. And I changed the four stepping motors from the printer. All works fine until today. One of the stepping motor get inverse. I been using the lower deck paper magazine during this issue, and check this out: the upper cutter did the cut 3 times....so strange. Before that, just turned off the Frontier.
Back in process, I could print about 600 6'x8' sheets without any problem.
Could be the wires from the PDC20 to the stepping motors? Could be the circuit board? (It has several time working -about 19 years-, and several stepping motor drivers changed)
If anybody know something about this, please let me note.