Is thir something in the way of sensor. Does the machine go all the way to end position or just a little bit and than back to home? If thus the case the sensor might be bad. Your black plug that goes into the printer is that wrapped around the leg of printer just how it was when unwrapped. I unwrapped the plug and did t wrap around leg so my plug hit my sensor and tweaked it a little. They are delicate I got lucky and when I pushed back in position the light went off. So check that and see if anything in way of those and check the bar on your printer that goes inbetween sensor to make sure it's ok.