I have a type DPU-411-040 type 20BU printer, don't know what is different but here are my settings that work with both my MT2500 and Pro-Link. 1 off, 2 on, 3 on, 4 on, 5 off, 6 off, 7 on, 8 on/ 1 on, 2 on, 3 on, 4 off, 5 on, 6 off. I have the manual and could ... Login to read more.